{"gene":"GHR","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2000,"finding":"TACE (ADAM-17) is the metalloprotease responsible for PMA-induced GHR proteolysis and GHBP shedding. Reconstitution of TACE-null fibroblasts with GHR alone failed to generate GHBP upon PMA treatment, whereas reconstitution with both GHR and TACE restored PMA-induced GHBP shedding and concomitant GHR downregulation. GHR dimerization and JAK2 activation in response to GH occurred independently of TACE expression.","method":"Genetic reconstitution in TACE-knockout mouse fibroblasts; immunoblotting; GHBP measurement; JAK2 activation assay","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 1 / Strong — genetic reconstitution with loss-of-function cell line plus functional readouts (GHBP shedding, GHR proteolysis, JAK2 activation), replicated with metalloprotease inhibitor IC3","pmids":["11108241"],"is_preprint":false},{"year":2002,"finding":"The GHR extracellular domain stem region cleavage site by TACE was mapped to residue 239 (FTCEEDFR) of rabbit GHR, located eight residues from the membrane. Spacing of residues in this region, rather than their identity, determines cleavage susceptibility. PMA-induced GHR proteolysis at this site desensitizes cells to GH-induced JAK2 activation, establishing that inducible GHR proteolysis regulates GH signaling.","method":"N-terminal sequencing of purified GHR remnant after adenoviral expression; deletion and alanine substitution mutagenesis; JAK2 activation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct sequencing of cleavage site combined with mutagenesis and functional signaling readout in single rigorous study","pmids":["12403792"],"is_preprint":false},{"year":1999,"finding":"GH induces GHR disulfide linkage that reflects GHR dimerization. Cysteine 241 in the extracellular domain is critical for GH-induced GHR disulfide linkage, but mutation of this cysteine does not prevent GHR dimerization, JAK2 association, or tyrosine phosphorylation of GHR, JAK2, and STAT5. Enhanced GHR-JAK2 association depends more on GHR dimerization than on GHR or JAK2 tyrosine phosphorylation.","method":"Site-directed mutagenesis (C241 substitution); GH antagonist G120K; anti-GHR dimerization-sensitive antibody; co-immunoprecipitation of JAK2 with GHR; phosphorylation assays in stable/transient expression systems","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with multiple orthogonal assays (co-IP, phosphorylation, GH antagonist) in single rigorous study","pmids":["10551877"],"is_preprint":false},{"year":1996,"finding":"Individual cytoplasmic tyrosine residues Y487, Y534, Y566, and Y627 of porcine GHR are each independently sufficient for STAT5 phosphorylation, demonstrating redundancy in GH-mediated STAT5 signaling. Tyrosine residues Y332, Y487, Y534, Y566, and Y627 are GHR phosphorylation sites. JAK2 activation is independent of GHR cytoplasmic tyrosine phosphorylation.","method":"Systematic phenylalanine substitution of eight cytoplasmic tyrosines; regeneration of individual tyrosines in tyrosine-free GHR; stable transfection in mouse L cells; STAT5 and JAK2 activation assays","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic mutagenesis of all cytoplasmic tyrosines with multiple orthogonal functional readouts in one rigorous study","pmids":["9121492"],"is_preprint":false},{"year":2009,"finding":"The GHR Box1 motif is required for JAK2 activation in vivo. Knock-in mice with four Pro/Ala mutations in Box1 cannot activate hepatic JAK2, STAT3, STAT5, or Akt in response to GH, but retain ability to activate Src and ERK1/2. Their growth phenotype is identical to GHR-/- mice, establishing JAK2 as the key mediator of postnatal growth via GHR. Transcript profiling identified in vivo Src/ERK-regulated versus JAK2-regulated versus STAT5-regulated transcripts.","method":"Targeted knock-in mice (Box1 quadruple Pro/Ala mutation); GH injection challenge; hepatic signaling assays (JAK2, STAT3, STAT5, Akt, Src, ERK1/2 phosphorylation); transcript profiling; comparison with GHR-/- and GHR-truncated (391) mice","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo genetic knock-in with multiple orthogonal signaling readouts and direct phenotypic comparison with null mice","pmids":["19884384"],"is_preprint":false},{"year":2004,"finding":"A monoclonal antibody (anti-GHR(ext-mAb)) recognizing subdomain 2 of the GHR extracellular domain inhibits GH-induced JAK2 and STAT5 tyrosine phosphorylation and GHR disulfide linkage (conformational changes) without fully blocking GH binding, and also prevents phorbol ester-stimulated GHR proteolysis. A Fab fragment reproduced these effects. The antibody fails to recognize a dimerization interface mutant GHR, indicating subdomain 2 undergoes conformational change upon GHR activation.","method":"Monoclonal antibody characterization; immunoprecipitation with GST-subdomain fusion proteins; signaling assays (JAK2, STAT5 phosphorylation); GHR disulfide linkage assay; GHR proteolysis assay; Fab fragment experiments; dimerization interface mutant GHR","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (antibody epitope mapping, signaling, proteolysis, mutant receptor) in single lab study","pmids":["15345746"],"is_preprint":false},{"year":2004,"finding":"A novel GHR C-terminal mutation (1776del, frameshift creating a nonsense 560-581 sequence) impairs GHR-STAT5 but not GHR-STAT3 signaling. Co-expression studies showed the mutant interferes with STAT5 docking to upstream tyrosine residues, whereas GHR-L561X and GHR-I582X (stop codons within the same region) show normal STAT5 activity, implicating the nonsense C-terminal sequence rather than truncation alone in STAT5 impairment.","method":"Transient transfection in CHO cells of wild-type and mutant GHR constructs; STAT5 and STAT3 transcriptional activation assays; STAT5 Tyr694 phosphorylation assay","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based reconstitution with multiple mutant constructs and two orthogonal readouts (phosphorylation and transcription), single lab","pmids":["15536163"],"is_preprint":false},{"year":2011,"finding":"A GHR intracellular domain frameshift mutation (c.899dupC) affecting the critical JAK2-binding Box1 region acts as a dominant negative, dose-dependently abolishing GH-induced STAT5b signaling when co-expressed with wild-type GHR or the p.R229H variant. The p.R229H variant alone is functional and does not cause GH insensitivity.","method":"Reconstitution studies with recombinant human GHR variants; co-expression of mutant and wild-type GHR; STAT5b phosphorylation and transcriptional activation assays; dose-dependent dominant-negative analysis","journal":"The Journal of clinical endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with dose-response dominant-negative analysis using multiple constructs and two orthogonal readouts, single lab","pmids":["21900382"],"is_preprint":false},{"year":2012,"finding":"Muscle-specific GHR knockout (mGHRKO) mice fed a high-fat diet show reduced adiposity, improved insulin sensitivity, lower systemic inflammation, decreased muscle and hepatic triglyceride content, and greater energy expenditure compared with controls. GH-regulated SOCS2 expression was decreased in obese mGHRKO mice. Muscle GHR deletion increased interleukin-15 and decreased myostatin expression, suggesting a mechanism for muscle-liver-adipose tissue cross-talk.","method":"Cre/loxP tissue-specific GHR knockout in postnatal skeletal muscle; metabolic phenotyping (body composition, insulin sensitivity, energy expenditure, respiratory exchange ratio); gene expression analysis (SOCS2, IL-15, myostatin)","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific knockout with multiple orthogonal metabolic readouts establishing direct GHR role in skeletal muscle metabolic regulation","pmids":["22187377"],"is_preprint":false},{"year":2016,"finding":"TIMP3, a natural specific inhibitor of TACE/ADAM17, modulates cell surface GHR abundance and GH sensitivity. Cells with higher endogenous TIMP3 expression showed lower mature TACE levels and reduced inducible GHR proteolysis, resulting in higher GH signaling capacity. Both endogenous and exogenous TIMP3 regulate GHR availability by controlling TACE activity and potentially TACE maturation.","method":"Comparison of two model cell lines; immunoblotting for TACE forms and TIMP3; GHR proteolysis assays; GH signaling assays; exogenous TIMP3 treatment","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based functional assays linking TIMP3 to TACE activity, GHR abundance, and GH signaling, two model systems, single lab","pmids":["27075707"],"is_preprint":false},{"year":2016,"finding":"GHR and PRLR form heteromultimeric assemblages composed of GHR homodimers and PRLR homodimers (rather than GHR-PRLR heterodimers). Split luciferase complementation showed ligand-independent GHR-GHR and PRLR-PRLR interactions; GH or PRL augment PRLR-PRLR complementation but cause decline in GHR-PRLR complementation signal, consistent with hetero-assemblages of pre-formed homodimers rather than direct heterodimers. GHR-PRLR association confirmed by co-immunoprecipitation in T47D cells.","method":"Split luciferase complementation assay with GHR and PRLR chimeras; co-immunoprecipitation in T47D human breast cancer cells; ligand-stimulation experiments with GH and PRL","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (split luciferase, co-IP) with ligand manipulation, single lab","pmids":["27003442"],"is_preprint":false},{"year":2007,"finding":"LPS directly suppresses GHR gene expression through TLR4/MD2 complex signaling via both MyD88-dependent and MyD88-independent (TRIF) pathways. This cytokine-independent mechanism was demonstrated by showing that dominant-negative TLR4 or dominant-negative MyD88/TRIF abrogated LPS-induced inhibition of GHR promoter activity in cells with ectopic TLR4/MD2 expression.","method":"Transient transfection in RAW 264.7 and HEK 293T cells; GHR promoter-luciferase assays; dominant-negative TLR4, MyD88, and TRIF co-transfection; Polymyxin B inhibition; endogenous GHR protein expression in F442A cells; cytokine exclusion experiment","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell systems with dominant-negative constructs and pharmacological controls establishing mechanistic pathway, single lab","pmids":["17601656"],"is_preprint":false},{"year":2006,"finding":"Src kinase transduces GHR signaling by tyrosine-phosphorylating GHR and STAT5. In F-36P leukemia cells, the Src inhibitor PP2 reduced GH-induced GHR and STAT5 tyrosine phosphorylation. Co-expression of wild-type Src with GHR in COS7 cells markedly increased GHR tyrosine phosphorylation (comparable to JAK2 co-expression), while kinase-inactive Src did not. Antisense src oligonucleotides reduced GH-induced STAT5 activation.","method":"Pharmacological Src inhibition (PP2); co-expression of GHR with wild-type or kinase-inactive Src in COS7 cells; antisense oligonucleotides against src; tyrosine phosphorylation assays","journal":"Leukemia research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (inhibitor, co-expression, antisense) in two cell systems, single lab","pmids":["16650892"],"is_preprint":false},{"year":2017,"finding":"GHR signaling in hypothalamic LepRb (leptin receptor-expressing) neurons controls hepatic glucose production. Mice with GHR-deleted LepRb neurons (LeprEYFPΔGHR) showed impaired hepatic insulin sensitivity and peripheral lipid metabolism with failure to suppress gluconeogenic gene expression and impaired hepatic insulin signaling, without changes in food intake, body weight, serum IGF-1 or GH.","method":"Cre/loxP conditional knockout of GHR in LepRb neurons; Cre-inducible ROSA26-EYFP reporter; body composition and glucose homeostasis measurements; hepatic gene expression; pStat5 immunoreactivity in LepRb neurons after GH injection","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific knockout with multiple metabolic readouts and mechanistic pathway analysis (gluconeogenic genes, insulin signaling), single lab","pmids":["28462074"],"is_preprint":false},{"year":2021,"finding":"Activation of ARCGHR+ neurons (GHR-expressing neurons in the arcuate nucleus) by DREADD elevates respiratory exchange ratio and promotes glucose over fat utilization under fasting; increases glucose turnover and whole-body glycolysis; and specifically elevates insulin-stimulated glucose uptake in skeletal muscle with increased expression of muscle glycolytic genes, demonstrated by hyperinsulinemic-euglycemic clamp studies.","method":"GHRcre transgenic mice; DREADD-mediated neuronal activation; hyperinsulinemic-euglycemic clamp; respiratory exchange ratio measurements; co-localization with AgRP, GHRH, somatostatin neurons; tissue-specific glucose uptake measurements","journal":"Cells","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific DREADD activation with gold-standard euglycemic clamp and multiple metabolic phenotypes, single lab","pmids":["34063647"],"is_preprint":false},{"year":2023,"finding":"GHR signaling in AgRP neurons regulates BAT thermogenesis in a sex-specific manner. Female AgRPΔGHR mice showed impaired temperature adaptation, reduced body core temperature across multiple ambient temperatures, decreased Ucp1 and Pgc1α expression in BAT, and blunted cold-induced neuronal activity in AgRP neurons compared to controls. These effects were sex-specific and not observed in males.","method":"AgRP-specific conditional GHR knockout; body core temperature measurements at multiple temperatures; BAT gene expression (Ucp1, Pgc1α); Fos immunostaining for neuronal activity; global BAT transcriptome","journal":"GeroScience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell-type-specific knockout with multiple orthogonal phenotypic and molecular readouts (temperature, gene expression, neuronal activity, transcriptome), single lab","pmids":["36633824"],"is_preprint":false},{"year":2023,"finding":"Hepatocyte-specific GHR signaling controls hepatic glycolysis, de novo lipogenesis (DNL), steatosis, and hepatic insulin sensitivity through both direct (STAT5b-mediated) and indirect (IGF1-mediated systemic insulin sensitivity) mechanisms. Adult-onset hepatocyte-specific GHR knockdown increased glucokinase (GCK) and ketohexokinase (KHK) expression and DNL rate; the KHK increase but not GCK increase was ChREBP-dependent. AAV-mediated STAT5b expression in hepatocytes normalized steatosis via IGF1-dependent and direct transcriptional mechanisms involving suppression of BCL6 and FOXO1 activity.","method":"Adult-onset hepatocyte-specific GHR knockdown (aHepGHRkd); AAV-mediated hepatocyte-specific IGF1 or constitutively active STAT5b expression; hyperinsulinemic-euglycemic clamps; DNL rate measurements; hepatic gene expression; ChREBP pathway analysis","journal":"Metabolism: clinical and experimental","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — tissue-specific knockdown with multiple genetic rescue constructs, clamp studies, and mechanistic pathway dissection in single rigorous study","pmids":["37182789"],"is_preprint":false},{"year":2021,"finding":"GHR-deficient (ghr KO) mice have elevated hepatic chaperone-mediated autophagy (CMA) that downregulates proteins involved in nucleocytosolic acetyl-CoA production (ACLY and ACSS2). CMA was shown to be necessary and sufficient to regulate ACLY and ACSS2 abundance in NIH3T3 cells. Lipid droplet accumulation upon CMA inhibition was rescued by knocking down ACLY or ACSS2, establishing a mechanistic link between GHR status, CMA activity, and lipid metabolism via acetyl-CoA enzymes.","method":"Quantitative proteomics of purified liver lysosomes and whole liver lysates from ghr KO mice; CMA inhibition/activation in NIH3T3 cells; ACLY and ACSS2 knockdown; lipid droplet phenotype rescue assay","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative proteomics combined with cell-based gain/loss-of-function rescue experiments, single lab","pmids":["34704522"],"is_preprint":false},{"year":2018,"finding":"The porcine GH/GHR complex translocates to cell nuclei via two routes: (1) clathrin- or caveolin-mediated endocytosis → early endosomes (Rab5-positive) → endoplasmic reticulum → cytoplasm (possibly via ERAD pathway) → importin α/β-mediated nuclear import; (2) internalization into nucleus-associated endosomes (NAE) → direct fusion with nuclear membrane.","method":"Indirect immunofluorescence; pharmacological inhibitors of endocytosis; gene silencing (siRNA); subcellular fractionation; Rab5 co-localization; importin α/β interaction studies in porcine hepatocytes","journal":"General and comparative endocrinology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple inhibitors and markers used but largely observational/co-localization without reconstitution, single lab","pmids":["29890130"],"is_preprint":false},{"year":2019,"finding":"Pegvisomant (GHR antagonist) undergoes endocytosis primarily via the clathrin pathway under GHR mediation, enters multiple endosome types, and is degraded cooperatively by proteasomes and lysosomes. Pegvisomant inhibits nuclear localization of GHR, identifying it as a 'moonlighting' antagonist that blocks both membrane-level and nuclear GHR functions.","method":"Indirect immunofluorescence; Western blot with pharmacological inhibitors; siRNA gene silencing; subcellular fractionation; immunohistochemistry in vitro and in vivo","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple inhibitors and siRNA with subcellular fractionation, single lab; nuclear localization confirmed in vivo and in vitro","pmids":["30602026"],"is_preprint":false},{"year":2021,"finding":"GHR knockdown in gastric cancer cells inhibits growth via the PI3K/AKT signaling pathway, causing G1 cell cycle arrest and increased apoptosis (elevated cleaved-PARP), demonstrated in cell lines and a mouse xenograft model.","method":"GHR siRNA/knockout in SGC-7901 and MGC-803 gastric cancer cells; mouse xenograft model; flow cytometry (cell cycle, apoptosis); Western blot (cleaved-PARP, PI3K/AKT pathway components)","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in two cell lines plus in vivo xenograft with defined molecular pathway readouts, single lab","pmids":["33492754"],"is_preprint":false},{"year":2011,"finding":"Regulation of cell surface GHR levels by the ratio of full-length GHR to truncated GHR (GHRt) modulates JAK2/STAT5 pathway activation and downstream IGF-I expression in fish skeletal muscle. Higher GHRt relative to GHRfl correlates with impaired JAK2/STAT5 activation and suppressed IGF-I expression, constituting an inherent GH resistance mechanism modulated by nutritional status.","method":"Western blotting for GHRfl and GHRt ratios; JAK2/STAT5 phosphorylation assays; IGF-I mRNA expression; comparison across feeding, fasting, and refeeding states in fine flounder","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — correlative but with direct signaling assays across multiple nutritional states, non-mammalian model, single lab","pmids":["22028448"],"is_preprint":false},{"year":2011,"finding":"GHR overexpression specifically in skeletal muscle of transgenic zebrafish induces hyperplasia but not hypertrophy; this is associated with increased SOCS1 and SOCS3 expression that impairs the GHR/IGF-I signaling pathway and decreases IGF-I expression, while myogenic regulatory factor gene expression is increased but muscle protein gene expression is decreased.","method":"Muscle-specific GHR transgenic zebrafish; histological analysis of muscle structure; gene expression of SOCS1/3, IGF-I, MRFs, muscle protein genes","journal":"Transgenic research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic overexpression with histological and molecular phenotyping, non-mammalian model, single lab","pmids":["21863247"],"is_preprint":false},{"year":2023,"finding":"Local GHR in chicken myoblasts promotes mitochondrial biogenesis during differentiation via an IGF1-PI3K/AKT/CREB pathway. GHR knockdown reduced mitochondrial biogenesis markers (PGC1α, NRF1, TFAM), mtDNA content, oxygen consumption rate, mitochondrial membrane potential, ATP levels, and increased ROS production, as well as repressed myoblast differentiation.","method":"GHR knockdown/overexpression in chicken primary myoblasts; MitoTracker Green staining; MitoTimer reporter; mtDNA quantification; oxygen consumption rate; PI3K inhibitor experiments; CREB pathway analysis","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal mitochondrial function readouts with pathway inhibition, non-mammalian (chicken) model, single lab","pmids":["37337300"],"is_preprint":false},{"year":2007,"finding":"GH excess in mice upregulates both full-length GHR and the membrane-associated GHBP (MA-GHBP, a dominant negative GHR short form) in liver, but MA-GHBP upregulation is proportionally greater than GHR upregulation. GH deficiency decreases both. This GH-induced enrichment of the dominant-negative form represents a compensatory mechanism to attenuate GH effects at supraphysiological concentrations.","method":"Analysis of GHR and MA-GHBP content in liver of mutant and transgenic mice with varying GH concentrations; correlation with body weight","journal":"Growth hormone & IGF research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple transgenic/mutant mouse models with differential GH levels, direct liver protein quantification, single lab","pmids":["17321774"],"is_preprint":false},{"year":2023,"finding":"Hepatic GHR deletion alters gut microbiota by affecting bile acid metabolism. Liver-specific GHR knockout (LKO) induced upregulation of CYP8B1, which increased the bile acid pool and altered the 12-OH/non-12-OH BA ratio. The impaired BA profile in cecal content interacted with gut bacteria, increasing production of acetic acid, propionic acid, and phenylacetic acid.","method":"Liver-specific and adipose-specific GHR knockout mice; gut microbiota profiling; metabolome analysis; CYP8B1 expression analysis; cecal BA measurement","journal":"Gut microbes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific knockout with mechanistic pathway identification (CYP8B1), metabolomics, and microbiota profiling, single lab","pmids":["37306416"],"is_preprint":false},{"year":2015,"finding":"GHR signaling specifically in osteocytes (DMP1-mediated Ghr knockout) does not affect linear growth but compromises overall bone accrual, reduces serum inorganic phosphate and PTH levels, and impairs response to intermittent PTH treatment. PTH sensitizes bone response to GH by increasing JAK2 and IGF-1R protein levels in osteocyte-like cells, establishing bidirectional crosstalk between PTH and GHR signaling in bone.","method":"DMP1-Cre-mediated osteocyte-specific Ghr knockout; bone phenotyping; serum phosphate and PTH measurement; osteocyte-like cell line GH + PTH co-stimulation; JAK2 and IGF-1R protein quantification; PTH treatment of DMP-GHRKO mice","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific knockout with in vitro mechanistic follow-up identifying JAK2/IGF-1R as PTH-regulated targets, single lab","pmids":["26481310"],"is_preprint":false}],"current_model":"GHR is a transmembrane cytokine receptor that pre-exists as a homodimer at the cell surface; GH binding induces conformational changes promoting GHR dimerization, disulfide linkage via extracellular Cys241, and enhanced recruitment and activation of JAK2 (via the cytoplasmic Box1 motif), which is the primary kinase required for postnatal growth and downstream STAT5 activation; redundant cytoplasmic tyrosines (Y487, Y534, Y566, Y627) support STAT5 phosphorylation while JAK2 activation itself is tyrosine-phosphorylation-independent; Src kinase also participates in GHR-dependent STAT5 signaling; cell surface GHR abundance is dynamically regulated by TACE/ADAM17-mediated metalloprotease cleavage at the stem region (residue 239), releasing the extracellular domain as circulating GHBP, a process inhibited endogenously by TIMP3 and activated by phorbol esters, thereby desensitizing cells to GH; GHR and PRLR form higher-order heteromultimers composed of GHR and PRLR homodimers; in addition to plasma membrane signaling, GHR/GH complexes can translocate to the nucleus via endosomal–ER or NAE routes; tissue-specific GHR signaling in hepatocytes controls glycolysis, de novo lipogenesis, and insulin sensitivity via STAT5b/IGF1 axes; in hypothalamic AgRP and LepRb neurons GHR regulates hepatic glucose production and BAT thermogenesis; and in skeletal muscle GHR signaling mediates systemic insulin resistance in obesity."},"narrative":{"mechanistic_narrative":"GHR is a transmembrane cytokine receptor that couples growth hormone binding to JAK2/STAT5 signaling and serves as the principal mediator of postnatal growth and tissue-specific metabolic control [PMID:19884384]. GH binding drives conformational change in extracellular subdomain 2 and GHR dimerization, accompanied by disulfide linkage through Cys241; this dimerization—rather than receptor tyrosine phosphorylation—is the key determinant of productive JAK2 recruitment [PMID:10551877, PMID:15345746]. The cytoplasmic Box1 motif is obligatory for JAK2 activation in vivo, and Box1 mutant knock-in mice phenocopy GHR-null growth failure while retaining Src/ERK signaling, establishing JAK2 as the critical growth-determining kinase downstream of GHR [PMID:19884384]. JAK2 activation is independent of GHR cytoplasmic tyrosines, whereas multiple cytoplasmic tyrosines (Y487, Y534, Y566, Y627) are each independently sufficient to support STAT5 phosphorylation, conferring redundancy in the STAT5 arm [PMID:9121492]; Src kinase additionally phosphorylates GHR and STAT5 [PMID:16650892]. Cell-surface receptor abundance is dynamically set by TACE/ADAM17-mediated cleavage at the stem region near residue 239, which releases the extracellular domain as GHBP and desensitizes cells to GH; this shedding is restrained endogenously by the TACE inhibitor TIMP3 [PMID:11108241, PMID:12403792, PMID:27075707]. GHR assembles with PRLR into higher-order heteromultimers built from preformed GHR and PRLR homodimers [PMID:27003442], and GH/GHR complexes can translocate to the nucleus through endosomal–ER and nucleus-associated-endosome routes [PMID:29890130]. Tissue-restricted GHR signaling governs distinct metabolic programs: hepatocyte GHR controls glycolysis, de novo lipogenesis, steatosis, and insulin sensitivity through STAT5b- and IGF1-dependent mechanisms [PMID:37182789], skeletal-muscle GHR drives systemic insulin resistance in obesity [PMID:22187377], and hypothalamic AgRP and LepRb neuron GHR regulates hepatic glucose production and BAT thermogenesis [PMID:28462074, PMID:36633824]. Loss-of-function and dominant-negative GHR mutations affecting the Box1/JAK2-binding region or C-terminal STAT5-docking sequence impair GH-induced STAT5 signaling and underlie GH insensitivity [PMID:21900382, PMID:15536163].","teleology":[{"year":1996,"claim":"Resolved how GHR couples to STAT5 versus JAK2, showing that JAK2 activation is independent of receptor tyrosines while multiple cytoplasmic tyrosines redundantly support STAT5.","evidence":"Systematic phenylalanine substitution and single-tyrosine regeneration of porcine GHR in mouse L cells with STAT5/JAK2 assays","pmids":["9121492"],"confidence":"High","gaps":["Did not define why specific tyrosines preferentially dock STAT5","Relative in vivo contribution of each tyrosine not established"]},{"year":1999,"claim":"Established that GH-induced dimerization, not tyrosine phosphorylation, drives GHR-JAK2 association, and that Cys241 mediates disulfide linkage but is dispensable for signaling.","evidence":"C241 site-directed mutagenesis with GH antagonist, dimerization-sensitive antibody, co-IP and phosphorylation assays","pmids":["10551877"],"confidence":"High","gaps":["Structural basis of the activating conformational change not resolved","Function of the disulfide linkage itself unclear"]},{"year":2000,"claim":"Identified TACE/ADAM17 as the protease generating GHBP and downregulating surface GHR, separating receptor shedding from GH-induced signaling.","evidence":"Genetic reconstitution of TACE-null fibroblasts with GHR ± TACE; GHBP shedding and JAK2 assays","pmids":["11108241"],"confidence":"High","gaps":["Physiological triggers of constitutive shedding beyond PMA not defined","In vivo contribution of TACE to circulating GHBP not quantified here"]},{"year":2002,"claim":"Mapped the TACE cleavage site to the stem region (residue 239) and showed that inducible proteolysis desensitizes cells to GH, linking shedding to signaling regulation.","evidence":"N-terminal sequencing of the GHR remnant plus deletion/alanine mutagenesis and JAK2 assays","pmids":["12403792"],"confidence":"High","gaps":["Determinants of constitutive vs inducible cleavage not fully separated","How spacing controls protease access mechanistically unresolved"]},{"year":2004,"claim":"Localized the activation-coupled conformational change to extracellular subdomain 2 and showed it gates both signaling and proteolysis.","evidence":"Conformation-sensitive monoclonal antibody/Fab, epitope mapping with GST-subdomain fusions, signaling and proteolysis assays, dimerization-interface mutant","pmids":["15345746"],"confidence":"High","gaps":["Atomic-resolution description of subdomain 2 rearrangement absent","Link between conformational state and protease susceptibility mechanistic detail unclear"]},{"year":2004,"claim":"Showed that a disease-associated C-terminal nonsense sequence, not truncation per se, selectively impairs GHR-STAT5 docking while sparing STAT3.","evidence":"CHO-cell reconstitution of WT and mutant GHR with STAT5/STAT3 transcriptional and STAT5 Tyr694 phosphorylation readouts","pmids":["15536163"],"confidence":"Medium","gaps":["Single-lab cell-based assay without in vivo confirmation","Mechanism of STAT5 docking interference at the residue level not defined"]},{"year":2006,"claim":"Added Src kinase as a direct contributor to GHR and STAT5 tyrosine phosphorylation, broadening the kinase repertoire beyond JAK2.","evidence":"Src inhibitor PP2, WT vs kinase-dead Src co-expression, and antisense src in F-36P and COS7 cells with phosphorylation assays","pmids":["16650892"],"confidence":"Medium","gaps":["Relationship between Src and JAK2 inputs not ordered","In vivo requirement for Src in GHR signaling not tested here"]},{"year":2009,"claim":"Defined JAK2 as the obligatory growth-determining mediator of GHR by showing Box1 mutant mice phenocopy GHR nulls while retaining Src/ERK signaling.","evidence":"Box1 quadruple Pro/Ala knock-in mice with GH challenge, hepatic signaling readouts, transcript profiling, and comparison to GHR-/- mice","pmids":["19884384"],"confidence":"High","gaps":["Physiological role of the JAK2-independent Src/ERK arm not defined","Tissue-specific dependence on JAK2 not dissected"]},{"year":2011,"claim":"Demonstrated a dominant-negative GHR mutation in the Box1/JAK2-binding region abolishes STAT5b signaling, clarifying genotype-function relationships in GH insensitivity.","evidence":"Reconstitution of human GHR variants with dose-dependent co-expression and STAT5b phosphorylation/transcription assays","pmids":["21900382"],"confidence":"High","gaps":["Single-lab in vitro reconstitution","Mechanism of dominant-negative interference within the receptor complex not structurally resolved"]},{"year":2007,"claim":"Identified ligand-independent transcriptional control of GHR by LPS via TLR4/MD2 through MyD88 and TRIF, linking innate immunity to GH resistance.","evidence":"GHR promoter-luciferase assays with dominant-negative TLR4/MyD88/TRIF and Polymyxin B controls in RAW264.7 and HEK293T cells","pmids":["17601656"],"confidence":"Medium","gaps":["Transcription factors directly repressing GHR not identified","In vivo relevance during infection not established here"]},{"year":2007,"claim":"Showed GH levels feed back on receptor expression by preferentially upregulating a dominant-negative GHR short form, a compensatory brake at high GH.","evidence":"Quantification of full-length GHR and MA-GHBP in liver of GH-altered transgenic/mutant mice","pmids":["17321774"],"confidence":"Medium","gaps":["Mechanism generating the membrane-associated short form unclear","Quantitative impact on GH signaling not directly measured"]},{"year":2011,"claim":"Extended GH-resistance mechanisms by showing the ratio of full-length to truncated GHR sets JAK2/STAT5 output and IGF-I expression under nutritional control.","evidence":"GHRfl/GHRt ratio immunoblotting with JAK2/STAT5 and IGF-I readouts across feeding states in fine flounder","pmids":["22028448"],"confidence":"Medium","gaps":["Correlative non-mammalian model","Mechanism by which truncated GHR suppresses signaling not dissected"]},{"year":2011,"claim":"Linked muscle GHR level to growth mode, showing overexpression drives hyperplasia via SOCS-mediated feedback that suppresses IGF-I.","evidence":"Muscle-specific GHR transgenic zebrafish with histology and SOCS1/3, IGF-I, MRF expression analysis","pmids":["21863247"],"confidence":"Medium","gaps":["Non-mammalian overexpression model","Mechanism distinguishing hyperplasia from hypertrophy not defined"]},{"year":2012,"claim":"Established skeletal-muscle GHR as a driver of diet-induced systemic insulin resistance and inter-organ metabolic crosstalk.","evidence":"Muscle-specific GHR knockout mice on high-fat diet with metabolic phenotyping and SOCS2/IL-15/myostatin expression","pmids":["22187377"],"confidence":"High","gaps":["Direct muscle-secreted mediators of crosstalk not proven causal","STAT5 dependence within muscle not isolated here"]},{"year":2015,"claim":"Revealed osteocyte GHR controls bone accrual and mineral homeostasis independent of linear growth, with reciprocal PTH-GH crosstalk.","evidence":"DMP1-Cre osteocyte-specific Ghr knockout with bone phenotyping, serum phosphate/PTH, and GH+PTH co-stimulation in osteocyte-like cells","pmids":["26481310"],"confidence":"Medium","gaps":["Molecular basis of PTH-driven JAK2/IGF-1R upregulation unclear","Single-lab characterization"]},{"year":2016,"claim":"Placed TIMP3 as an endogenous brake on GHR shedding, tuning surface receptor abundance and GH sensitivity via TACE control.","evidence":"Comparison of cell lines with differing TIMP3, TACE-form immunoblotting, GHR proteolysis and GH signaling assays with exogenous TIMP3","pmids":["27075707"],"confidence":"Medium","gaps":["Two-cell-line correlative system","Whether TIMP3 acts on TACE activity vs maturation not resolved"]},{"year":2016,"claim":"Defined the architecture of GHR-PRLR co-assembly as heteromultimers of preformed homodimers rather than direct heterodimers.","evidence":"Split-luciferase complementation and co-IP in T47D cells with GH/PRL ligand stimulation","pmids":["27003442"],"confidence":"Medium","gaps":["Functional consequence of hetero-assembly for signaling not established","Stoichiometry and structure not resolved"]},{"year":2017,"claim":"Identified central GHR action in LepRb neurons as a regulator of hepatic glucose production and peripheral lipid metabolism independent of growth axis hormones.","evidence":"LepRb-specific GHR conditional knockout with glucose homeostasis, hepatic gluconeogenic gene and insulin-signaling analysis, and pSTAT5 readout","pmids":["28462074"],"confidence":"High","gaps":["Neuron-to-liver signaling relay not mapped","Downstream neuronal effectors unknown"]},{"year":2018,"claim":"Described nuclear trafficking routes for the GH/GHR complex, supporting a non-membrane signaling mode.","evidence":"Immunofluorescence, endocytosis inhibitors, siRNA, fractionation, Rab5 co-localization and importin studies in porcine hepatocytes","pmids":["29890130"],"confidence":"Medium","gaps":["Largely observational without reconstitution","Nuclear function of translocated GHR not defined"]},{"year":2019,"claim":"Showed the GHR antagonist pegvisomant blocks both membrane and nuclear GHR functions, defining nuclear localization as a targetable axis.","evidence":"Immunofluorescence, inhibitor/siRNA experiments, fractionation, and in vivo/in vitro immunohistochemistry","pmids":["30602026"],"confidence":"Medium","gaps":["Mechanism by which pegvisomant blocks nuclear import unclear","Functional output of nuclear GHR still undefined"]},{"year":2020,"claim":"Implicated GHR in tumor cell growth, showing knockdown induces G1 arrest and apoptosis via PI3K/AKT in gastric cancer.","evidence":"GHR knockdown in two gastric cancer cell lines plus xenografts with cell-cycle, apoptosis, and PI3K/AKT readouts","pmids":["33492754"],"confidence":"Medium","gaps":["Whether effect is GH-dependent not addressed","Single-lab model without genetic rescue"]},{"year":2021,"claim":"Connected GHR status to hepatic lipid metabolism through chaperone-mediated autophagy control of acetyl-CoA-producing enzymes ACLY and ACSS2.","evidence":"Quantitative proteomics of ghr KO liver lysosomes plus CMA modulation and ACLY/ACSS2 knockdown rescue in NIH3T3 cells","pmids":["34704522"],"confidence":"Medium","gaps":["How GHR loss elevates CMA mechanistically unclear","In vivo causality of the CMA-ACLY/ACSS2 axis not isolated"]},{"year":2021,"claim":"Demonstrated that arcuate GHR+ neuron activity shifts whole-body substrate use toward glycolysis and enhances muscle insulin-stimulated glucose uptake.","evidence":"GHRcre mice with DREADD activation, hyperinsulinemic-euglycemic clamp, RER, and tissue glucose uptake measurements","pmids":["34063647"],"confidence":"High","gaps":["Neuronal-to-muscle relay circuit not defined","Endogenous physiological trigger not established"]},{"year":2023,"claim":"Dissected hepatocyte GHR control of glycolysis, lipogenesis, and insulin sensitivity into direct STAT5b/BCL6/FOXO1 and IGF1-mediated indirect arms.","evidence":"Adult-onset hepatocyte GHR knockdown with AAV IGF1 and constitutively active STAT5b rescue, clamps, DNL measurement, and ChREBP pathway analysis","pmids":["37182789"],"confidence":"High","gaps":["Relative quantitative weighting of direct vs indirect arms not fully resolved","ChREBP-independent GCK induction mechanism unknown"]},{"year":2023,"claim":"Identified sex-specific AgRP-neuron GHR control of BAT thermogenesis, expanding central GHR roles to thermoregulation.","evidence":"AgRP-specific GHR knockout with core temperature, BAT Ucp1/Pgc1α expression, Fos neuronal activity, and BAT transcriptome","pmids":["36633824"],"confidence":"High","gaps":["Basis of sex specificity not defined","AgRP-to-BAT circuit not mapped"]},{"year":2023,"claim":"Linked hepatic GHR to gut microbiota via CYP8B1-driven bile acid remodeling, extending GHR metabolic influence to the gut-liver axis.","evidence":"Liver- and adipose-specific GHR knockout mice with microbiota profiling, metabolomics, CYP8B1 and cecal bile acid measurement","pmids":["37306416"],"confidence":"Medium","gaps":["Causal direction between BA changes and microbiota not fully established","Transcriptional control of CYP8B1 by GHR not detailed"]},{"year":null,"claim":"The functional purpose and downstream gene-regulatory targets of nuclear-translocated GHR, and the structural basis of the dimerization-coupled conformational change, remain unresolved.","evidence":"No reconstitution or structural study in the timeline directly establishes nuclear GHR transcriptional output or an atomic activation model","pmids":[],"confidence":"Low","gaps":["No defined nuclear effector or target genes for translocated GHR","No atomic-resolution model of the activating conformational change","Integration of JAK2, Src, and nuclear signaling arms not unified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,2,3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18,19]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[18,19]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,3,12]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[16,8,17]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,9]}],"complexes":["GHR homodimer","GHR-PRLR heteromultimer"],"partners":["JAK2","STAT5B","SRC","ADAM17","TIMP3","PRLR","IGF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P10912","full_name":"Growth hormone receptor","aliases":["Somatotropin receptor"],"length_aa":638,"mass_kda":71.5,"function":"Receptor for pituitary gland growth hormone (GH1) involved in regulating postnatal body growth (PubMed:1549776, PubMed:2825030, PubMed:8943276). On ligand binding, couples to the JAK2/STAT5 pathway (PubMed:1549776, PubMed:15690087, PubMed:2825030, PubMed:8943276) The soluble form (GHBP) acts as a reservoir of growth hormone in plasma and may be a modulator/inhibitor of GH signaling Up-regulates the production of the soluble Growth hormone-binding protein form (GHBP) and acts as a negative inhibitor of growth hormone signaling","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P10912/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GHR","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GHR","total_profiled":1310},"omim":[{"mim_id":"621274","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 152; CCDC152","url":"https://www.omim.org/entry/621274"},{"mim_id":"613461","title":"LEPTIN RECEPTOR OVERLAPPING TRANSCRIPT; LEPROT","url":"https://www.omim.org/entry/613461"},{"mim_id":"606945","title":"LOW DENSITY LIPOPROTEIN RECEPTOR; LDLR","url":"https://www.omim.org/entry/606945"},{"mim_id":"604271","title":"GROWTH HORMONE INSENSITIVITY, PARTIAL; GHIP","url":"https://www.omim.org/entry/604271"},{"mim_id":"604260","title":"SIGNAL TRANSDUCER AND ACTIVATOR OF TRANSCRIPTION 5B; STAT5B","url":"https://www.omim.org/entry/604260"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Cytoplasmic bodies","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":79.5},{"tissue":"liver","ntpm":199.5}],"url":"https://www.proteinatlas.org/search/GHR"},"hgnc":{"alias_symbol":["GHBP"],"prev_symbol":[]},"alphafold":{"accession":"P10912","domains":[{"cath_id":"2.60.40.10","chopping":"53-146","consensus_level":"high","plddt":86.1773,"start":53,"end":146},{"cath_id":"2.60.40.10","chopping":"154-251","consensus_level":"high","plddt":94.4333,"start":154,"end":251}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P10912","model_url":"https://alphafold.ebi.ac.uk/files/AF-P10912-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P10912-F1-predicted_aligned_error_v6.png","plddt_mean":58.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GHR","jax_strain_url":"https://www.jax.org/strain/search?query=GHR"},"sequence":{"accession":"P10912","fasta_url":"https://rest.uniprot.org/uniprotkb/P10912.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P10912/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P10912"}},"corpus_meta":[{"pmid":"10875265","id":"PMC_10875265","title":"Assessment of growth parameters and life span of GHR/BP gene-disrupted mice.","date":"2000","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/10875265","citation_count":483,"is_preprint":false},{"pmid":"21123740","id":"PMC_21123740","title":"Endocrine parameters and phenotypes of the growth hormone receptor gene disrupted (GHR-/-) mouse.","date":"2010","source":"Endocrine reviews","url":"https://pubmed.ncbi.nlm.nih.gov/21123740","citation_count":151,"is_preprint":false},{"pmid":"11108241","id":"PMC_11108241","title":"Tumor necrosis factor-alpha converting enzyme (TACE) is a growth hormone binding protein (GHBP) sheddase: the metalloprotease TACE/ADAM-17 is critical for (PMA-induced) GH receptor proteolysis and GHBP generation.","date":"2000","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/11108241","citation_count":116,"is_preprint":false},{"pmid":"23288882","id":"PMC_23288882","title":"Granulation pattern, but not GSP or GHR mutation, is associated with clinical characteristics in somatostatin-naive patients with somatotroph adenomas.","date":"2013","source":"European journal of endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/23288882","citation_count":104,"is_preprint":false},{"pmid":"27496016","id":"PMC_27496016","title":"Effects of dietary postbiotic and inulin on growth performance, IGF1 and GHR mRNA expression, faecal microbiota and volatile fatty acids in broilers.","date":"2016","source":"BMC veterinary research","url":"https://pubmed.ncbi.nlm.nih.gov/27496016","citation_count":91,"is_preprint":false},{"pmid":"15862563","id":"PMC_15862563","title":"Duplication of growth hormone receptor (GHR) in fish genome: gene organization and transcriptional regulation of GHR type I and II in gilthead sea bream (Sparus aurata).","date":"2005","source":"General and comparative endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/15862563","citation_count":89,"is_preprint":false},{"pmid":"10465263","id":"PMC_10465263","title":"Reduced growth hormone receptor (GHR) messenger ribonucleic acid in liver of periparturient cattle is caused by a specific down-regulation of GHR 1A that is associated with decreased insulin-like growth factor I.","date":"1999","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/10465263","citation_count":88,"is_preprint":false},{"pmid":"10551877","id":"PMC_10551877","title":"Disulfide linkage of growth hormone (GH) receptors (GHR) reflects GH-induced GHR dimerization. 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Reconstitution of TACE-null fibroblasts with GHR alone failed to generate GHBP upon PMA treatment, whereas reconstitution with both GHR and TACE restored PMA-induced GHBP shedding and concomitant GHR downregulation. GHR dimerization and JAK2 activation in response to GH occurred independently of TACE expression.\",\n      \"method\": \"Genetic reconstitution in TACE-knockout mouse fibroblasts; immunoblotting; GHBP measurement; JAK2 activation assay\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genetic reconstitution with loss-of-function cell line plus functional readouts (GHBP shedding, GHR proteolysis, JAK2 activation), replicated with metalloprotease inhibitor IC3\",\n      \"pmids\": [\"11108241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The GHR extracellular domain stem region cleavage site by TACE was mapped to residue 239 (FTCEEDFR) of rabbit GHR, located eight residues from the membrane. Spacing of residues in this region, rather than their identity, determines cleavage susceptibility. PMA-induced GHR proteolysis at this site desensitizes cells to GH-induced JAK2 activation, establishing that inducible GHR proteolysis regulates GH signaling.\",\n      \"method\": \"N-terminal sequencing of purified GHR remnant after adenoviral expression; deletion and alanine substitution mutagenesis; JAK2 activation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct sequencing of cleavage site combined with mutagenesis and functional signaling readout in single rigorous study\",\n      \"pmids\": [\"12403792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"GH induces GHR disulfide linkage that reflects GHR dimerization. Cysteine 241 in the extracellular domain is critical for GH-induced GHR disulfide linkage, but mutation of this cysteine does not prevent GHR dimerization, JAK2 association, or tyrosine phosphorylation of GHR, JAK2, and STAT5. Enhanced GHR-JAK2 association depends more on GHR dimerization than on GHR or JAK2 tyrosine phosphorylation.\",\n      \"method\": \"Site-directed mutagenesis (C241 substitution); GH antagonist G120K; anti-GHR dimerization-sensitive antibody; co-immunoprecipitation of JAK2 with GHR; phosphorylation assays in stable/transient expression systems\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with multiple orthogonal assays (co-IP, phosphorylation, GH antagonist) in single rigorous study\",\n      \"pmids\": [\"10551877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Individual cytoplasmic tyrosine residues Y487, Y534, Y566, and Y627 of porcine GHR are each independently sufficient for STAT5 phosphorylation, demonstrating redundancy in GH-mediated STAT5 signaling. Tyrosine residues Y332, Y487, Y534, Y566, and Y627 are GHR phosphorylation sites. JAK2 activation is independent of GHR cytoplasmic tyrosine phosphorylation.\",\n      \"method\": \"Systematic phenylalanine substitution of eight cytoplasmic tyrosines; regeneration of individual tyrosines in tyrosine-free GHR; stable transfection in mouse L cells; STAT5 and JAK2 activation assays\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic mutagenesis of all cytoplasmic tyrosines with multiple orthogonal functional readouts in one rigorous study\",\n      \"pmids\": [\"9121492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The GHR Box1 motif is required for JAK2 activation in vivo. Knock-in mice with four Pro/Ala mutations in Box1 cannot activate hepatic JAK2, STAT3, STAT5, or Akt in response to GH, but retain ability to activate Src and ERK1/2. Their growth phenotype is identical to GHR-/- mice, establishing JAK2 as the key mediator of postnatal growth via GHR. Transcript profiling identified in vivo Src/ERK-regulated versus JAK2-regulated versus STAT5-regulated transcripts.\",\n      \"method\": \"Targeted knock-in mice (Box1 quadruple Pro/Ala mutation); GH injection challenge; hepatic signaling assays (JAK2, STAT3, STAT5, Akt, Src, ERK1/2 phosphorylation); transcript profiling; comparison with GHR-/- and GHR-truncated (391) mice\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo genetic knock-in with multiple orthogonal signaling readouts and direct phenotypic comparison with null mice\",\n      \"pmids\": [\"19884384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A monoclonal antibody (anti-GHR(ext-mAb)) recognizing subdomain 2 of the GHR extracellular domain inhibits GH-induced JAK2 and STAT5 tyrosine phosphorylation and GHR disulfide linkage (conformational changes) without fully blocking GH binding, and also prevents phorbol ester-stimulated GHR proteolysis. A Fab fragment reproduced these effects. The antibody fails to recognize a dimerization interface mutant GHR, indicating subdomain 2 undergoes conformational change upon GHR activation.\",\n      \"method\": \"Monoclonal antibody characterization; immunoprecipitation with GST-subdomain fusion proteins; signaling assays (JAK2, STAT5 phosphorylation); GHR disulfide linkage assay; GHR proteolysis assay; Fab fragment experiments; dimerization interface mutant GHR\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (antibody epitope mapping, signaling, proteolysis, mutant receptor) in single lab study\",\n      \"pmids\": [\"15345746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A novel GHR C-terminal mutation (1776del, frameshift creating a nonsense 560-581 sequence) impairs GHR-STAT5 but not GHR-STAT3 signaling. Co-expression studies showed the mutant interferes with STAT5 docking to upstream tyrosine residues, whereas GHR-L561X and GHR-I582X (stop codons within the same region) show normal STAT5 activity, implicating the nonsense C-terminal sequence rather than truncation alone in STAT5 impairment.\",\n      \"method\": \"Transient transfection in CHO cells of wild-type and mutant GHR constructs; STAT5 and STAT3 transcriptional activation assays; STAT5 Tyr694 phosphorylation assay\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based reconstitution with multiple mutant constructs and two orthogonal readouts (phosphorylation and transcription), single lab\",\n      \"pmids\": [\"15536163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A GHR intracellular domain frameshift mutation (c.899dupC) affecting the critical JAK2-binding Box1 region acts as a dominant negative, dose-dependently abolishing GH-induced STAT5b signaling when co-expressed with wild-type GHR or the p.R229H variant. The p.R229H variant alone is functional and does not cause GH insensitivity.\",\n      \"method\": \"Reconstitution studies with recombinant human GHR variants; co-expression of mutant and wild-type GHR; STAT5b phosphorylation and transcriptional activation assays; dose-dependent dominant-negative analysis\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with dose-response dominant-negative analysis using multiple constructs and two orthogonal readouts, single lab\",\n      \"pmids\": [\"21900382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Muscle-specific GHR knockout (mGHRKO) mice fed a high-fat diet show reduced adiposity, improved insulin sensitivity, lower systemic inflammation, decreased muscle and hepatic triglyceride content, and greater energy expenditure compared with controls. GH-regulated SOCS2 expression was decreased in obese mGHRKO mice. Muscle GHR deletion increased interleukin-15 and decreased myostatin expression, suggesting a mechanism for muscle-liver-adipose tissue cross-talk.\",\n      \"method\": \"Cre/loxP tissue-specific GHR knockout in postnatal skeletal muscle; metabolic phenotyping (body composition, insulin sensitivity, energy expenditure, respiratory exchange ratio); gene expression analysis (SOCS2, IL-15, myostatin)\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific knockout with multiple orthogonal metabolic readouts establishing direct GHR role in skeletal muscle metabolic regulation\",\n      \"pmids\": [\"22187377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TIMP3, a natural specific inhibitor of TACE/ADAM17, modulates cell surface GHR abundance and GH sensitivity. Cells with higher endogenous TIMP3 expression showed lower mature TACE levels and reduced inducible GHR proteolysis, resulting in higher GH signaling capacity. Both endogenous and exogenous TIMP3 regulate GHR availability by controlling TACE activity and potentially TACE maturation.\",\n      \"method\": \"Comparison of two model cell lines; immunoblotting for TACE forms and TIMP3; GHR proteolysis assays; GH signaling assays; exogenous TIMP3 treatment\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based functional assays linking TIMP3 to TACE activity, GHR abundance, and GH signaling, two model systems, single lab\",\n      \"pmids\": [\"27075707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GHR and PRLR form heteromultimeric assemblages composed of GHR homodimers and PRLR homodimers (rather than GHR-PRLR heterodimers). Split luciferase complementation showed ligand-independent GHR-GHR and PRLR-PRLR interactions; GH or PRL augment PRLR-PRLR complementation but cause decline in GHR-PRLR complementation signal, consistent with hetero-assemblages of pre-formed homodimers rather than direct heterodimers. GHR-PRLR association confirmed by co-immunoprecipitation in T47D cells.\",\n      \"method\": \"Split luciferase complementation assay with GHR and PRLR chimeras; co-immunoprecipitation in T47D human breast cancer cells; ligand-stimulation experiments with GH and PRL\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (split luciferase, co-IP) with ligand manipulation, single lab\",\n      \"pmids\": [\"27003442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LPS directly suppresses GHR gene expression through TLR4/MD2 complex signaling via both MyD88-dependent and MyD88-independent (TRIF) pathways. This cytokine-independent mechanism was demonstrated by showing that dominant-negative TLR4 or dominant-negative MyD88/TRIF abrogated LPS-induced inhibition of GHR promoter activity in cells with ectopic TLR4/MD2 expression.\",\n      \"method\": \"Transient transfection in RAW 264.7 and HEK 293T cells; GHR promoter-luciferase assays; dominant-negative TLR4, MyD88, and TRIF co-transfection; Polymyxin B inhibition; endogenous GHR protein expression in F442A cells; cytokine exclusion experiment\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell systems with dominant-negative constructs and pharmacological controls establishing mechanistic pathway, single lab\",\n      \"pmids\": [\"17601656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Src kinase transduces GHR signaling by tyrosine-phosphorylating GHR and STAT5. In F-36P leukemia cells, the Src inhibitor PP2 reduced GH-induced GHR and STAT5 tyrosine phosphorylation. Co-expression of wild-type Src with GHR in COS7 cells markedly increased GHR tyrosine phosphorylation (comparable to JAK2 co-expression), while kinase-inactive Src did not. Antisense src oligonucleotides reduced GH-induced STAT5 activation.\",\n      \"method\": \"Pharmacological Src inhibition (PP2); co-expression of GHR with wild-type or kinase-inactive Src in COS7 cells; antisense oligonucleotides against src; tyrosine phosphorylation assays\",\n      \"journal\": \"Leukemia research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (inhibitor, co-expression, antisense) in two cell systems, single lab\",\n      \"pmids\": [\"16650892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GHR signaling in hypothalamic LepRb (leptin receptor-expressing) neurons controls hepatic glucose production. Mice with GHR-deleted LepRb neurons (LeprEYFPΔGHR) showed impaired hepatic insulin sensitivity and peripheral lipid metabolism with failure to suppress gluconeogenic gene expression and impaired hepatic insulin signaling, without changes in food intake, body weight, serum IGF-1 or GH.\",\n      \"method\": \"Cre/loxP conditional knockout of GHR in LepRb neurons; Cre-inducible ROSA26-EYFP reporter; body composition and glucose homeostasis measurements; hepatic gene expression; pStat5 immunoreactivity in LepRb neurons after GH injection\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific knockout with multiple metabolic readouts and mechanistic pathway analysis (gluconeogenic genes, insulin signaling), single lab\",\n      \"pmids\": [\"28462074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Activation of ARCGHR+ neurons (GHR-expressing neurons in the arcuate nucleus) by DREADD elevates respiratory exchange ratio and promotes glucose over fat utilization under fasting; increases glucose turnover and whole-body glycolysis; and specifically elevates insulin-stimulated glucose uptake in skeletal muscle with increased expression of muscle glycolytic genes, demonstrated by hyperinsulinemic-euglycemic clamp studies.\",\n      \"method\": \"GHRcre transgenic mice; DREADD-mediated neuronal activation; hyperinsulinemic-euglycemic clamp; respiratory exchange ratio measurements; co-localization with AgRP, GHRH, somatostatin neurons; tissue-specific glucose uptake measurements\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific DREADD activation with gold-standard euglycemic clamp and multiple metabolic phenotypes, single lab\",\n      \"pmids\": [\"34063647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GHR signaling in AgRP neurons regulates BAT thermogenesis in a sex-specific manner. Female AgRPΔGHR mice showed impaired temperature adaptation, reduced body core temperature across multiple ambient temperatures, decreased Ucp1 and Pgc1α expression in BAT, and blunted cold-induced neuronal activity in AgRP neurons compared to controls. These effects were sex-specific and not observed in males.\",\n      \"method\": \"AgRP-specific conditional GHR knockout; body core temperature measurements at multiple temperatures; BAT gene expression (Ucp1, Pgc1α); Fos immunostaining for neuronal activity; global BAT transcriptome\",\n      \"journal\": \"GeroScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific knockout with multiple orthogonal phenotypic and molecular readouts (temperature, gene expression, neuronal activity, transcriptome), single lab\",\n      \"pmids\": [\"36633824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Hepatocyte-specific GHR signaling controls hepatic glycolysis, de novo lipogenesis (DNL), steatosis, and hepatic insulin sensitivity through both direct (STAT5b-mediated) and indirect (IGF1-mediated systemic insulin sensitivity) mechanisms. Adult-onset hepatocyte-specific GHR knockdown increased glucokinase (GCK) and ketohexokinase (KHK) expression and DNL rate; the KHK increase but not GCK increase was ChREBP-dependent. AAV-mediated STAT5b expression in hepatocytes normalized steatosis via IGF1-dependent and direct transcriptional mechanisms involving suppression of BCL6 and FOXO1 activity.\",\n      \"method\": \"Adult-onset hepatocyte-specific GHR knockdown (aHepGHRkd); AAV-mediated hepatocyte-specific IGF1 or constitutively active STAT5b expression; hyperinsulinemic-euglycemic clamps; DNL rate measurements; hepatic gene expression; ChREBP pathway analysis\",\n      \"journal\": \"Metabolism: clinical and experimental\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — tissue-specific knockdown with multiple genetic rescue constructs, clamp studies, and mechanistic pathway dissection in single rigorous study\",\n      \"pmids\": [\"37182789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GHR-deficient (ghr KO) mice have elevated hepatic chaperone-mediated autophagy (CMA) that downregulates proteins involved in nucleocytosolic acetyl-CoA production (ACLY and ACSS2). CMA was shown to be necessary and sufficient to regulate ACLY and ACSS2 abundance in NIH3T3 cells. Lipid droplet accumulation upon CMA inhibition was rescued by knocking down ACLY or ACSS2, establishing a mechanistic link between GHR status, CMA activity, and lipid metabolism via acetyl-CoA enzymes.\",\n      \"method\": \"Quantitative proteomics of purified liver lysosomes and whole liver lysates from ghr KO mice; CMA inhibition/activation in NIH3T3 cells; ACLY and ACSS2 knockdown; lipid droplet phenotype rescue assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative proteomics combined with cell-based gain/loss-of-function rescue experiments, single lab\",\n      \"pmids\": [\"34704522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The porcine GH/GHR complex translocates to cell nuclei via two routes: (1) clathrin- or caveolin-mediated endocytosis → early endosomes (Rab5-positive) → endoplasmic reticulum → cytoplasm (possibly via ERAD pathway) → importin α/β-mediated nuclear import; (2) internalization into nucleus-associated endosomes (NAE) → direct fusion with nuclear membrane.\",\n      \"method\": \"Indirect immunofluorescence; pharmacological inhibitors of endocytosis; gene silencing (siRNA); subcellular fractionation; Rab5 co-localization; importin α/β interaction studies in porcine hepatocytes\",\n      \"journal\": \"General and comparative endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple inhibitors and markers used but largely observational/co-localization without reconstitution, single lab\",\n      \"pmids\": [\"29890130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Pegvisomant (GHR antagonist) undergoes endocytosis primarily via the clathrin pathway under GHR mediation, enters multiple endosome types, and is degraded cooperatively by proteasomes and lysosomes. Pegvisomant inhibits nuclear localization of GHR, identifying it as a 'moonlighting' antagonist that blocks both membrane-level and nuclear GHR functions.\",\n      \"method\": \"Indirect immunofluorescence; Western blot with pharmacological inhibitors; siRNA gene silencing; subcellular fractionation; immunohistochemistry in vitro and in vivo\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple inhibitors and siRNA with subcellular fractionation, single lab; nuclear localization confirmed in vivo and in vitro\",\n      \"pmids\": [\"30602026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GHR knockdown in gastric cancer cells inhibits growth via the PI3K/AKT signaling pathway, causing G1 cell cycle arrest and increased apoptosis (elevated cleaved-PARP), demonstrated in cell lines and a mouse xenograft model.\",\n      \"method\": \"GHR siRNA/knockout in SGC-7901 and MGC-803 gastric cancer cells; mouse xenograft model; flow cytometry (cell cycle, apoptosis); Western blot (cleaved-PARP, PI3K/AKT pathway components)\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in two cell lines plus in vivo xenograft with defined molecular pathway readouts, single lab\",\n      \"pmids\": [\"33492754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Regulation of cell surface GHR levels by the ratio of full-length GHR to truncated GHR (GHRt) modulates JAK2/STAT5 pathway activation and downstream IGF-I expression in fish skeletal muscle. Higher GHRt relative to GHRfl correlates with impaired JAK2/STAT5 activation and suppressed IGF-I expression, constituting an inherent GH resistance mechanism modulated by nutritional status.\",\n      \"method\": \"Western blotting for GHRfl and GHRt ratios; JAK2/STAT5 phosphorylation assays; IGF-I mRNA expression; comparison across feeding, fasting, and refeeding states in fine flounder\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — correlative but with direct signaling assays across multiple nutritional states, non-mammalian model, single lab\",\n      \"pmids\": [\"22028448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GHR overexpression specifically in skeletal muscle of transgenic zebrafish induces hyperplasia but not hypertrophy; this is associated with increased SOCS1 and SOCS3 expression that impairs the GHR/IGF-I signaling pathway and decreases IGF-I expression, while myogenic regulatory factor gene expression is increased but muscle protein gene expression is decreased.\",\n      \"method\": \"Muscle-specific GHR transgenic zebrafish; histological analysis of muscle structure; gene expression of SOCS1/3, IGF-I, MRFs, muscle protein genes\",\n      \"journal\": \"Transgenic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic overexpression with histological and molecular phenotyping, non-mammalian model, single lab\",\n      \"pmids\": [\"21863247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Local GHR in chicken myoblasts promotes mitochondrial biogenesis during differentiation via an IGF1-PI3K/AKT/CREB pathway. GHR knockdown reduced mitochondrial biogenesis markers (PGC1α, NRF1, TFAM), mtDNA content, oxygen consumption rate, mitochondrial membrane potential, ATP levels, and increased ROS production, as well as repressed myoblast differentiation.\",\n      \"method\": \"GHR knockdown/overexpression in chicken primary myoblasts; MitoTracker Green staining; MitoTimer reporter; mtDNA quantification; oxygen consumption rate; PI3K inhibitor experiments; CREB pathway analysis\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal mitochondrial function readouts with pathway inhibition, non-mammalian (chicken) model, single lab\",\n      \"pmids\": [\"37337300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GH excess in mice upregulates both full-length GHR and the membrane-associated GHBP (MA-GHBP, a dominant negative GHR short form) in liver, but MA-GHBP upregulation is proportionally greater than GHR upregulation. GH deficiency decreases both. This GH-induced enrichment of the dominant-negative form represents a compensatory mechanism to attenuate GH effects at supraphysiological concentrations.\",\n      \"method\": \"Analysis of GHR and MA-GHBP content in liver of mutant and transgenic mice with varying GH concentrations; correlation with body weight\",\n      \"journal\": \"Growth hormone & IGF research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple transgenic/mutant mouse models with differential GH levels, direct liver protein quantification, single lab\",\n      \"pmids\": [\"17321774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Hepatic GHR deletion alters gut microbiota by affecting bile acid metabolism. Liver-specific GHR knockout (LKO) induced upregulation of CYP8B1, which increased the bile acid pool and altered the 12-OH/non-12-OH BA ratio. The impaired BA profile in cecal content interacted with gut bacteria, increasing production of acetic acid, propionic acid, and phenylacetic acid.\",\n      \"method\": \"Liver-specific and adipose-specific GHR knockout mice; gut microbiota profiling; metabolome analysis; CYP8B1 expression analysis; cecal BA measurement\",\n      \"journal\": \"Gut microbes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific knockout with mechanistic pathway identification (CYP8B1), metabolomics, and microbiota profiling, single lab\",\n      \"pmids\": [\"37306416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GHR signaling specifically in osteocytes (DMP1-mediated Ghr knockout) does not affect linear growth but compromises overall bone accrual, reduces serum inorganic phosphate and PTH levels, and impairs response to intermittent PTH treatment. PTH sensitizes bone response to GH by increasing JAK2 and IGF-1R protein levels in osteocyte-like cells, establishing bidirectional crosstalk between PTH and GHR signaling in bone.\",\n      \"method\": \"DMP1-Cre-mediated osteocyte-specific Ghr knockout; bone phenotyping; serum phosphate and PTH measurement; osteocyte-like cell line GH + PTH co-stimulation; JAK2 and IGF-1R protein quantification; PTH treatment of DMP-GHRKO mice\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific knockout with in vitro mechanistic follow-up identifying JAK2/IGF-1R as PTH-regulated targets, single lab\",\n      \"pmids\": [\"26481310\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GHR is a transmembrane cytokine receptor that pre-exists as a homodimer at the cell surface; GH binding induces conformational changes promoting GHR dimerization, disulfide linkage via extracellular Cys241, and enhanced recruitment and activation of JAK2 (via the cytoplasmic Box1 motif), which is the primary kinase required for postnatal growth and downstream STAT5 activation; redundant cytoplasmic tyrosines (Y487, Y534, Y566, Y627) support STAT5 phosphorylation while JAK2 activation itself is tyrosine-phosphorylation-independent; Src kinase also participates in GHR-dependent STAT5 signaling; cell surface GHR abundance is dynamically regulated by TACE/ADAM17-mediated metalloprotease cleavage at the stem region (residue 239), releasing the extracellular domain as circulating GHBP, a process inhibited endogenously by TIMP3 and activated by phorbol esters, thereby desensitizing cells to GH; GHR and PRLR form higher-order heteromultimers composed of GHR and PRLR homodimers; in addition to plasma membrane signaling, GHR/GH complexes can translocate to the nucleus via endosomal–ER or NAE routes; tissue-specific GHR signaling in hepatocytes controls glycolysis, de novo lipogenesis, and insulin sensitivity via STAT5b/IGF1 axes; in hypothalamic AgRP and LepRb neurons GHR regulates hepatic glucose production and BAT thermogenesis; and in skeletal muscle GHR signaling mediates systemic insulin resistance in obesity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GHR is a transmembrane cytokine receptor that couples growth hormone binding to JAK2/STAT5 signaling and serves as the principal mediator of postnatal growth and tissue-specific metabolic control [#4]. GH binding drives conformational change in extracellular subdomain 2 and GHR dimerization, accompanied by disulfide linkage through Cys241; this dimerization—rather than receptor tyrosine phosphorylation—is the key determinant of productive JAK2 recruitment [#2, #5]. The cytoplasmic Box1 motif is obligatory for JAK2 activation in vivo, and Box1 mutant knock-in mice phenocopy GHR-null growth failure while retaining Src/ERK signaling, establishing JAK2 as the critical growth-determining kinase downstream of GHR [#4]. JAK2 activation is independent of GHR cytoplasmic tyrosines, whereas multiple cytoplasmic tyrosines (Y487, Y534, Y566, Y627) are each independently sufficient to support STAT5 phosphorylation, conferring redundancy in the STAT5 arm [#3]; Src kinase additionally phosphorylates GHR and STAT5 [#12]. Cell-surface receptor abundance is dynamically set by TACE/ADAM17-mediated cleavage at the stem region near residue 239, which releases the extracellular domain as GHBP and desensitizes cells to GH; this shedding is restrained endogenously by the TACE inhibitor TIMP3 [#0, #1, #9]. GHR assembles with PRLR into higher-order heteromultimers built from preformed GHR and PRLR homodimers [#10], and GH/GHR complexes can translocate to the nucleus through endosomal–ER and nucleus-associated-endosome routes [#18]. Tissue-restricted GHR signaling governs distinct metabolic programs: hepatocyte GHR controls glycolysis, de novo lipogenesis, steatosis, and insulin sensitivity through STAT5b- and IGF1-dependent mechanisms [#16], skeletal-muscle GHR drives systemic insulin resistance in obesity [#8], and hypothalamic AgRP and LepRb neuron GHR regulates hepatic glucose production and BAT thermogenesis [#13, #15]. Loss-of-function and dominant-negative GHR mutations affecting the Box1/JAK2-binding region or C-terminal STAT5-docking sequence impair GH-induced STAT5 signaling and underlie GH insensitivity [#7, #6].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Resolved how GHR couples to STAT5 versus JAK2, showing that JAK2 activation is independent of receptor tyrosines while multiple cytoplasmic tyrosines redundantly support STAT5.\",\n      \"evidence\": \"Systematic phenylalanine substitution and single-tyrosine regeneration of porcine GHR in mouse L cells with STAT5/JAK2 assays\",\n      \"pmids\": [\"9121492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define why specific tyrosines preferentially dock STAT5\", \"Relative in vivo contribution of each tyrosine not established\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that GH-induced dimerization, not tyrosine phosphorylation, drives GHR-JAK2 association, and that Cys241 mediates disulfide linkage but is dispensable for signaling.\",\n      \"evidence\": \"C241 site-directed mutagenesis with GH antagonist, dimerization-sensitive antibody, co-IP and phosphorylation assays\",\n      \"pmids\": [\"10551877\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the activating conformational change not resolved\", \"Function of the disulfide linkage itself unclear\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified TACE/ADAM17 as the protease generating GHBP and downregulating surface GHR, separating receptor shedding from GH-induced signaling.\",\n      \"evidence\": \"Genetic reconstitution of TACE-null fibroblasts with GHR ± TACE; GHBP shedding and JAK2 assays\",\n      \"pmids\": [\"11108241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological triggers of constitutive shedding beyond PMA not defined\", \"In vivo contribution of TACE to circulating GHBP not quantified here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapped the TACE cleavage site to the stem region (residue 239) and showed that inducible proteolysis desensitizes cells to GH, linking shedding to signaling regulation.\",\n      \"evidence\": \"N-terminal sequencing of the GHR remnant plus deletion/alanine mutagenesis and JAK2 assays\",\n      \"pmids\": [\"12403792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of constitutive vs inducible cleavage not fully separated\", \"How spacing controls protease access mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Localized the activation-coupled conformational change to extracellular subdomain 2 and showed it gates both signaling and proteolysis.\",\n      \"evidence\": \"Conformation-sensitive monoclonal antibody/Fab, epitope mapping with GST-subdomain fusions, signaling and proteolysis assays, dimerization-interface mutant\",\n      \"pmids\": [\"15345746\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution description of subdomain 2 rearrangement absent\", \"Link between conformational state and protease susceptibility mechanistic detail unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed that a disease-associated C-terminal nonsense sequence, not truncation per se, selectively impairs GHR-STAT5 docking while sparing STAT3.\",\n      \"evidence\": \"CHO-cell reconstitution of WT and mutant GHR with STAT5/STAT3 transcriptional and STAT5 Tyr694 phosphorylation readouts\",\n      \"pmids\": [\"15536163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab cell-based assay without in vivo confirmation\", \"Mechanism of STAT5 docking interference at the residue level not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Added Src kinase as a direct contributor to GHR and STAT5 tyrosine phosphorylation, broadening the kinase repertoire beyond JAK2.\",\n      \"evidence\": \"Src inhibitor PP2, WT vs kinase-dead Src co-expression, and antisense src in F-36P and COS7 cells with phosphorylation assays\",\n      \"pmids\": [\"16650892\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between Src and JAK2 inputs not ordered\", \"In vivo requirement for Src in GHR signaling not tested here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined JAK2 as the obligatory growth-determining mediator of GHR by showing Box1 mutant mice phenocopy GHR nulls while retaining Src/ERK signaling.\",\n      \"evidence\": \"Box1 quadruple Pro/Ala knock-in mice with GH challenge, hepatic signaling readouts, transcript profiling, and comparison to GHR-/- mice\",\n      \"pmids\": [\"19884384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological role of the JAK2-independent Src/ERK arm not defined\", \"Tissue-specific dependence on JAK2 not dissected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated a dominant-negative GHR mutation in the Box1/JAK2-binding region abolishes STAT5b signaling, clarifying genotype-function relationships in GH insensitivity.\",\n      \"evidence\": \"Reconstitution of human GHR variants with dose-dependent co-expression and STAT5b phosphorylation/transcription assays\",\n      \"pmids\": [\"21900382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-lab in vitro reconstitution\", \"Mechanism of dominant-negative interference within the receptor complex not structurally resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified ligand-independent transcriptional control of GHR by LPS via TLR4/MD2 through MyD88 and TRIF, linking innate immunity to GH resistance.\",\n      \"evidence\": \"GHR promoter-luciferase assays with dominant-negative TLR4/MyD88/TRIF and Polymyxin B controls in RAW264.7 and HEK293T cells\",\n      \"pmids\": [\"17601656\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcription factors directly repressing GHR not identified\", \"In vivo relevance during infection not established here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed GH levels feed back on receptor expression by preferentially upregulating a dominant-negative GHR short form, a compensatory brake at high GH.\",\n      \"evidence\": \"Quantification of full-length GHR and MA-GHBP in liver of GH-altered transgenic/mutant mice\",\n      \"pmids\": [\"17321774\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism generating the membrane-associated short form unclear\", \"Quantitative impact on GH signaling not directly measured\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended GH-resistance mechanisms by showing the ratio of full-length to truncated GHR sets JAK2/STAT5 output and IGF-I expression under nutritional control.\",\n      \"evidence\": \"GHRfl/GHRt ratio immunoblotting with JAK2/STAT5 and IGF-I readouts across feeding states in fine flounder\",\n      \"pmids\": [\"22028448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative non-mammalian model\", \"Mechanism by which truncated GHR suppresses signaling not dissected\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked muscle GHR level to growth mode, showing overexpression drives hyperplasia via SOCS-mediated feedback that suppresses IGF-I.\",\n      \"evidence\": \"Muscle-specific GHR transgenic zebrafish with histology and SOCS1/3, IGF-I, MRF expression analysis\",\n      \"pmids\": [\"21863247\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Non-mammalian overexpression model\", \"Mechanism distinguishing hyperplasia from hypertrophy not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established skeletal-muscle GHR as a driver of diet-induced systemic insulin resistance and inter-organ metabolic crosstalk.\",\n      \"evidence\": \"Muscle-specific GHR knockout mice on high-fat diet with metabolic phenotyping and SOCS2/IL-15/myostatin expression\",\n      \"pmids\": [\"22187377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct muscle-secreted mediators of crosstalk not proven causal\", \"STAT5 dependence within muscle not isolated here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed osteocyte GHR controls bone accrual and mineral homeostasis independent of linear growth, with reciprocal PTH-GH crosstalk.\",\n      \"evidence\": \"DMP1-Cre osteocyte-specific Ghr knockout with bone phenotyping, serum phosphate/PTH, and GH+PTH co-stimulation in osteocyte-like cells\",\n      \"pmids\": [\"26481310\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of PTH-driven JAK2/IGF-1R upregulation unclear\", \"Single-lab characterization\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed TIMP3 as an endogenous brake on GHR shedding, tuning surface receptor abundance and GH sensitivity via TACE control.\",\n      \"evidence\": \"Comparison of cell lines with differing TIMP3, TACE-form immunoblotting, GHR proteolysis and GH signaling assays with exogenous TIMP3\",\n      \"pmids\": [\"27075707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Two-cell-line correlative system\", \"Whether TIMP3 acts on TACE activity vs maturation not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the architecture of GHR-PRLR co-assembly as heteromultimers of preformed homodimers rather than direct heterodimers.\",\n      \"evidence\": \"Split-luciferase complementation and co-IP in T47D cells with GH/PRL ligand stimulation\",\n      \"pmids\": [\"27003442\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of hetero-assembly for signaling not established\", \"Stoichiometry and structure not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified central GHR action in LepRb neurons as a regulator of hepatic glucose production and peripheral lipid metabolism independent of growth axis hormones.\",\n      \"evidence\": \"LepRb-specific GHR conditional knockout with glucose homeostasis, hepatic gluconeogenic gene and insulin-signaling analysis, and pSTAT5 readout\",\n      \"pmids\": [\"28462074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuron-to-liver signaling relay not mapped\", \"Downstream neuronal effectors unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Described nuclear trafficking routes for the GH/GHR complex, supporting a non-membrane signaling mode.\",\n      \"evidence\": \"Immunofluorescence, endocytosis inhibitors, siRNA, fractionation, Rab5 co-localization and importin studies in porcine hepatocytes\",\n      \"pmids\": [\"29890130\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Largely observational without reconstitution\", \"Nuclear function of translocated GHR not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed the GHR antagonist pegvisomant blocks both membrane and nuclear GHR functions, defining nuclear localization as a targetable axis.\",\n      \"evidence\": \"Immunofluorescence, inhibitor/siRNA experiments, fractionation, and in vivo/in vitro immunohistochemistry\",\n      \"pmids\": [\"30602026\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which pegvisomant blocks nuclear import unclear\", \"Functional output of nuclear GHR still undefined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Implicated GHR in tumor cell growth, showing knockdown induces G1 arrest and apoptosis via PI3K/AKT in gastric cancer.\",\n      \"evidence\": \"GHR knockdown in two gastric cancer cell lines plus xenografts with cell-cycle, apoptosis, and PI3K/AKT readouts\",\n      \"pmids\": [\"33492754\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether effect is GH-dependent not addressed\", \"Single-lab model without genetic rescue\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected GHR status to hepatic lipid metabolism through chaperone-mediated autophagy control of acetyl-CoA-producing enzymes ACLY and ACSS2.\",\n      \"evidence\": \"Quantitative proteomics of ghr KO liver lysosomes plus CMA modulation and ACLY/ACSS2 knockdown rescue in NIH3T3 cells\",\n      \"pmids\": [\"34704522\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How GHR loss elevates CMA mechanistically unclear\", \"In vivo causality of the CMA-ACLY/ACSS2 axis not isolated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated that arcuate GHR+ neuron activity shifts whole-body substrate use toward glycolysis and enhances muscle insulin-stimulated glucose uptake.\",\n      \"evidence\": \"GHRcre mice with DREADD activation, hyperinsulinemic-euglycemic clamp, RER, and tissue glucose uptake measurements\",\n      \"pmids\": [\"34063647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuronal-to-muscle relay circuit not defined\", \"Endogenous physiological trigger not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Dissected hepatocyte GHR control of glycolysis, lipogenesis, and insulin sensitivity into direct STAT5b/BCL6/FOXO1 and IGF1-mediated indirect arms.\",\n      \"evidence\": \"Adult-onset hepatocyte GHR knockdown with AAV IGF1 and constitutively active STAT5b rescue, clamps, DNL measurement, and ChREBP pathway analysis\",\n      \"pmids\": [\"37182789\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative quantitative weighting of direct vs indirect arms not fully resolved\", \"ChREBP-independent GCK induction mechanism unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified sex-specific AgRP-neuron GHR control of BAT thermogenesis, expanding central GHR roles to thermoregulation.\",\n      \"evidence\": \"AgRP-specific GHR knockout with core temperature, BAT Ucp1/Pgc1\\u03b1 expression, Fos neuronal activity, and BAT transcriptome\",\n      \"pmids\": [\"36633824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis of sex specificity not defined\", \"AgRP-to-BAT circuit not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked hepatic GHR to gut microbiota via CYP8B1-driven bile acid remodeling, extending GHR metabolic influence to the gut-liver axis.\",\n      \"evidence\": \"Liver- and adipose-specific GHR knockout mice with microbiota profiling, metabolomics, CYP8B1 and cecal bile acid measurement\",\n      \"pmids\": [\"37306416\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal direction between BA changes and microbiota not fully established\", \"Transcriptional control of CYP8B1 by GHR not detailed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The functional purpose and downstream gene-regulatory targets of nuclear-translocated GHR, and the structural basis of the dimerization-coupled conformational change, remain unresolved.\",\n      \"evidence\": \"No reconstitution or structural study in the timeline directly establishes nuclear GHR transcriptional output or an atomic activation model\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No defined nuclear effector or target genes for translocated GHR\", \"No atomic-resolution model of the activating conformational change\", \"Integration of JAK2, Src, and nuclear signaling arms not unified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 2, 3]},\n      {\"term_id\": \"GO:0019199\", \"supporting_discovery_ids\": []}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18, 19]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [18, 19]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 3, 12]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [16, 8, 17]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 9]}\n    ],\n    \"complexes\": [\"GHR homodimer\", \"GHR-PRLR heteromultimer\"],\n    \"partners\": [\"JAK2\", \"STAT5B\", \"SRC\", \"ADAM17\", \"TIMP3\", \"PRLR\", \"IGF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}