{"gene":"PLOD2","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2003,"finding":"PLOD2 was identified as the telopeptide lysyl hydroxylase (TLH) responsible for hydroxylation of lysine residues within the telopeptides of fibrillar collagens. Two missense mutations in exon 17 of PLOD2 were found in Bruck syndrome patients who have pyridinoline cross-link deficiency in bone collagen, and fibrotic fibroblasts with elevated PLOD2 mRNA showed increased pyridinoline cross-link levels in deposited matrix, directly linking PLOD2 enzymatic activity to telopeptide lysine hydroxylation and collagen cross-linking.","method":"Genetic mutation analysis of Bruck syndrome patients; mRNA quantification and pyridinoline cross-link measurement in SSc fibroblasts","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function (disease mutations) combined with biochemical cross-link assay in patient-derived fibroblasts; replicated by multiple subsequent studies","pmids":["12881513"],"is_preprint":false},{"year":2004,"finding":"A hotspot region in the C-terminal domain of PLOD2 (residues ~598–608) is functionally critical for telopeptide lysyl hydroxylase activity; missense mutations (Arg598His, Gly601Val, Thr608Ile) in this region cause Bruck syndrome with pyridinoline deficiency and low collagen cross-link degradation products in urine.","method":"Mutation analysis of Bruck syndrome patient with Arg598His substitution; urine collagen cross-link metabolite analysis","journal":"American journal of medical genetics. Part A","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — disease mutation mapping with biochemical phenotype in a single patient; supports functional domain localization","pmids":["15523624"],"is_preprint":false},{"year":2004,"finding":"PLOD2 exists as two alternatively spliced isoforms: a long form (including 63 bp exon 13A, ubiquitously expressed) and a short form (co-expressed in kidney, spleen, liver, placenta). The splicing of exon 13A is regulated by cell density and protein synthesis (cycloheximide treatment), suggesting a newly-synthesized factor controls inclusion of exon 13A. The relative expression of these isoforms determines the type of collagen cross-links formed.","method":"RT-PCR, Northern blot; cycloheximide treatment of human skin fibroblasts and kidney cells","journal":"Matrix biology : journal of the International Society for Matrix Biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab with multiple cell types and pharmacological perturbation; functional consequences inferred from isoform differences","pmids":["15694128"],"is_preprint":false},{"year":2012,"finding":"Homozygous frameshift mutations in the alternative exon 13a of PLOD2 are sufficient to cause Bruck syndrome, indicating that the longer PLOD2 protein isoform (encoded by exon 13a) is specifically required for normal telopeptide lysine hydroxylation in bone. Compound heterozygous PLOD2 mutations can also produce autosomal recessive OI phenotypes without joint contractures.","method":"Homozygosity mapping, Sanger sequencing, mutation analysis in consanguineous families","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function in multiple families establishing isoform-specific requirement; no direct enzyme assay","pmids":["22689593"],"is_preprint":false},{"year":2013,"finding":"HIF-1 transcriptionally activates PLOD2 expression in fibroblasts under hypoxic conditions. PLOD2 is required for ECM stiffening and collagen fiber alignment under hypoxia; its loss (along with P4HA1/P4HA2) prevents hypoxia-induced ECM remodeling, collagen deposition, and downstream changes in breast cancer cell morphology, adhesion, and motility.","method":"siRNA knockdown of PLOD2 in fibroblasts; collagen fiber alignment and ECM stiffness assays; co-culture with breast cancer cells; HIF-1 ChIP/reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with multiple orthogonal functional readouts (ECM stiffness, fiber alignment, cancer cell motility); replicated across labs","pmids":["23423382"],"is_preprint":false},{"year":2021,"finding":"Compound heterozygous PLOD2 mutations in a Bruck syndrome patient cause diminished hydroxylation specifically of type I collagen telopeptide lysines (but not triple-helical lysines), resulting in near-complete absence of stable trivalent collagen cross-links in bone and replacement by allysine aldol dimeric cross-links (as in skin). Cartilage type II collagen telopeptide lysines from the same patient were normally hydroxylated, revealing tissue-specific control of collagen cross-link chemistry.","method":"Mass spectrometry of bone collagen cross-linked peptides from patient biopsy; comparison with urine-derived cartilage collagen","journal":"JBMR plus","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct biochemical characterization (MS) of collagen cross-link chemistry in patient tissue; rigorous mechanistic linkage of PLOD2 loss to specific cross-link deficiency","pmids":["33778323"],"is_preprint":false},{"year":2017,"finding":"PLOD2 knockdown in glioma cells inactivates the PI3K/AKT signaling pathway and downregulates EMT-associated markers (E-cadherin, vimentin, N-cadherin, β-catenin, snail, slug), inhibiting proliferation, migration, and invasion. PLOD2 expression is induced by HIF-1α under hypoxia, placing PLOD2 downstream of HIF-1α in hypoxia-driven EMT.","method":"siRNA knockdown; Western blot for PI3K/AKT and EMT markers; in vitro migration/invasion assays; in vivo xenograft","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with pathway marker readout and in vivo validation; single lab","pmids":["28410212"],"is_preprint":false},{"year":2017,"finding":"PLOD2 is transcriptionally regulated by the transcription factor FOXA1 acting downstream of the EGFR-PI3K/AKT axis. FOXA1 directly binds the PLOD2 promoter to activate PLOD2 transcription in NSCLC cells. PLOD2 promotes metastasis directly by enhancing migration and indirectly by inducing collagen reorganization.","method":"ChIP assay of FOXA1 on PLOD2 promoter; gain- and loss-of-function studies; orthotopic metastasis model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding demonstrated by ChIP; functional rescue experiments; single lab","pmids":["29072684"],"is_preprint":false},{"year":2017,"finding":"PLOD2 knockdown in cervical cancer cells inhibits cell migration, invasion, and adhesion to type I collagen. PLOD2 depletion prevents β-catenin nuclear translocation (blocking TGF-β1-induced EMT) and inhibits focal adhesion formation. Hypoxia and TGF-β1 each induce PLOD2 expression to promote these processes.","method":"siRNA knockdown; wound healing/Transwell assays; immunocytochemistry for β-catenin; phalloidin staining for focal adhesions; Western blot","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple orthogonal cellular readouts; single lab","pmids":["28507454"],"is_preprint":false},{"year":2020,"finding":"PLOD2 hydroxylates integrin β1, and this hydroxylation is required for integrin β1 stabilization and recruitment to the plasma membrane. Loss of PLOD2 expression prevents integrin β1 from reaching its functional site (plasma membrane), abrogating tumor cell motility and metastasis in vivo in head and neck SCC.","method":"Loss-of-function studies; subcellular fractionation/membrane localization of integrin β1; in vivo metastasis model; co-expression analysis in patient tissue","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic linkage of PLOD2 hydroxylase activity to integrin β1 membrane localization with in vivo validation; replicated in follow-up study (PMID 33887877)","pmids":["32058962"],"is_preprint":false},{"year":2021,"finding":"IL-6 released by CD163+ M2-type tumor-associated macrophages activates STAT3, which directly binds and activates the PLOD2 promoter in oral SCC cells, thereby increasing PLOD2 expression. This upregulation of PLOD2 stabilizes integrin β1 and promotes invasion/metastasis. IL-6 stimulation did not directly affect integrin β1 expression or maturation.","method":"Dual-luciferase reporter assay for STAT3 binding to PLOD2 promoter; siRNA; immunofluorescence double staining for IL-6 and CD163 in patient tissue","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding shown by luciferase reporter; supported by tissue immunofluorescence; single lab","pmids":["33887877"],"is_preprint":false},{"year":2023,"finding":"PLOD2 expression is associated with elevated cytoplasmic succinate levels during EMT. PLOD2 silencing in breast cancer cells reduces succinate levels and inhibits mesenchymal phenotypes and stemness, accompanied by increased 5-hydroxymethylcytosine (5hmC) in chromatin. Exogenous succinate rescues stemness and 5hmC levels in PLOD2-silenced cells, indicating PLOD2 promotes cancer progression at least partly through succinate-mediated epigenetic regulation.","method":"Stable isotope-resolved metabolomics; ChIP-seq for 5hmC; PLOD2 silencing; exogenous succinate rescue experiment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — metabolomics plus ChIP-seq plus rescue experiment establish novel PLOD2-succinate-5hmC axis; multiple orthogonal methods in single study","pmids":["37155842"],"is_preprint":false},{"year":2023,"finding":"PLOD2 interacts with USP15 (ubiquitin-specific protease 15) and stabilizes USP15 in the cytoplasm, leading to activation of AKT/mTOR phosphorylation and promotion of colorectal cancer proliferation, invasion, and metastasis. The PLOD2 inhibitor minoxidil downregulates PLOD2, suppresses USP15, and inhibits AKT/mTOR phosphorylation.","method":"Co-immunoprecipitation; Western blot for AKT/mTOR phosphorylation; overexpression and knockdown; in vivo xenograft; minoxidil pharmacological inhibition","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP establishes PLOD2–USP15 interaction; AKT/mTOR activation shown by Western blot; single lab","pmids":["37227305"],"is_preprint":false},{"year":2023,"finding":"PLOD2 binds to the extracellular domain of EGFR, leading to EGFR phosphorylation and downstream AKT signaling pathway activation in clear cell renal cell carcinoma. HIF1A transcriptionally activates PLOD2 by binding a specific promoter region. PLOD2 inhibitor minoxidil suppresses ccRCC progression by inactivating the EGFR/AKT axis.","method":"Co-immunoprecipitation (PLOD2–EGFR interaction); HIF1A ChIP on PLOD2 promoter; phosphorylation assays; knockdown/overexpression; in vivo xenograft; minoxidil treatment","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP for PLOD2-EGFR interaction plus functional validation; single lab; HIF1A promoter binding shown by ChIP","pmids":["38008826"],"is_preprint":false},{"year":2019,"finding":"PLOD2 promotes aerobic glycolysis in colorectal cancer cells by upregulating hexokinase 2 (HK2) expression via the STAT3 signaling pathway. HK2 overexpression reverses the inhibitory effects of PLOD2 knockdown, establishing a PLOD2–STAT3–HK2 functional axis in glucose metabolism.","method":"siRNA knockdown of PLOD2; HK2 overexpression rescue; Western blot for STAT3 and HK2; glycolysis assays","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — rescue experiment with HK2 supports epistatic relationship; single lab, two methods","pmids":["31742425"],"is_preprint":false},{"year":2018,"finding":"KDM1A (histone demethylase) associates with PLOD2 to form a protein complex in stem cells of the apical papilla (SCAPs). Knockdown of either KDM1A or PLOD2 inhibits alkaline phosphatase activity and mineralization and promotes expression of osteo/dentinogenic differentiation markers (DSPP, DMP1, BSP, RUNX2, OSX, DLX2).","method":"Co-immunoprecipitation (KDM1A–PLOD2 interaction); siRNA knockdown; ALP assay; Alizarin red staining; in vivo transplantation","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP establishes complex; functional knockdown with multiple differentiation markers; single lab","pmids":["29656462"],"is_preprint":false},{"year":2024,"finding":"METTL3-mediated m6A modification of PLOD2 mRNA at its 3'UTR promotes PLOD2 protein translation under prolonged hypoxia. HIF-1α binds the METTL3 promoter to enhance its transcription, and METTL3 in turn increases PLOD2 protein levels in an m6A-dependent manner to promote renal cell carcinoma progression. AAV9-mediated re-transduction of PLOD2 rescued tumor growth suppressed by METTL3 inhibition in vivo.","method":"MeRIP-seq; METTL3 inhibitor STM2457; AAV9-PLOD2 rescue in vivo; HIF-1α ChIP on METTL3 promoter; Western blot","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP-seq identifies m6A site; in vivo rescue establishes epistasis; single lab","pmids":["38233403"],"is_preprint":false},{"year":2021,"finding":"IGF2BP2 binds to the m6A-modified 3'UTR of PLOD2 mRNA and positively regulates PLOD2 mRNA stability in varicocele rat testes. Targeted demethylation of PLOD2 m6A by a CRISPR/dCas13b-ALKBH5 system decreases PLOD2 expression and promotes GC-2 cell proliferation while inhibiting apoptosis under oxidative stress.","method":"MeRIP-seq/qPCR; RIP-qPCR; luciferase assay for IGF2BP2–PLOD2 mRNA interaction; CRISPR/dCas13b-ALKBH5 demethylation; cell proliferation/apoptosis assays","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-qPCR and luciferase establish IGF2BP2 as m6A reader; CRISPR demethylation validates functional consequence; single lab","pmids":["37670228"],"is_preprint":false},{"year":2021,"finding":"PLOD2 is required for L1CAM-driven colorectal cancer proliferation, motility, tumorigenesis, and liver metastasis. L1CAM upregulates PLOD2 expression via ezrin signaling and SMAD2/3 pathway activation. Suppression of endogenous PLOD2 expression or inhibition of its enzymatic activity blocks the tumorigenic properties conferred by L1CAM.","method":"shRNA-mediated PLOD2 knockdown; enzymatic inhibition; tumorigenesis/liver metastasis assays in vivo; Western blot for SMAD2/3","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic placement of PLOD2 downstream of L1/ezrin/SMAD; enzymatic activity requirement demonstrated; single lab","pmids":["33805564"],"is_preprint":false},{"year":2021,"finding":"Adipose-derived stromal cells (ADSCs) upregulate PLOD2 in spinal cord neurons via TGF-β1 secretion and downstream Smad3 phosphorylation. PLOD2 upregulation is required for the neuroprotective/neurorestorative effects of ADSCs after spinal cord injury; inhibiting TGF-β1 signaling (with SB431542) or PLOD2 expression abrogates neuronal survival, axonal regeneration promotion, and functional recovery.","method":"In vitro mechanical injury model; rat SCI model; PLOD2 knockdown; TGF-β1 receptor inhibitor SB431542; immunostaining for MAP2, NSE, GAP43, GFAP","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and pharmacological inhibition with defined pathway and in vivo readout; single lab","pmids":["33495412"],"is_preprint":false},{"year":2024,"finding":"HIF-1α activates PLOD2 expression in mesenchymal progenitor cells, and the HIF-1α/PLOD2/LOX axis regulates collagen cross-linking, glucose metabolism, and osteogenic differentiation. Inhibition of PLOD2 activity significantly decreases osteogenic differentiation and glycolytic metabolism in MPCs, and genetic deletion of Hif1α in zeugopod mesenchymal cells reduces PLOD2/LOX pathway activity and mitigates heterotopic ossification in vivo.","method":"Conditional Hif1α knockout mouse (Hoxa11-CreERT2; Hif1afl/fl); scRNA-seq; pharmacological PLOD2 inhibition; osteogenic differentiation assays; glycolysis measurement","journal":"Bone research","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic KO with scRNA-seq pathway analysis plus pharmacological PLOD2 inhibition with metabolic and differentiation readouts; multiple orthogonal methods","pmids":["38472175"],"is_preprint":false},{"year":2023,"finding":"PLOD2 is transcriptionally regulated by interferon regulatory factor 5 (IRF5) in hepatocellular carcinoma cells, as shown by a luciferase reporter assay. PLOD2 in turn promotes HCC metastasis via upregulation of BIRC3 (baculoviral IAP repeat containing 3), placing PLOD2 in an IRF5–PLOD2–BIRC3 signaling axis.","method":"Luciferase reporter assay (IRF5 → PLOD2 promoter); RNA sequencing; PLOD2 knockdown with downstream BIRC3 measurement; in vivo metastasis model","journal":"Journal of clinical and translational hepatology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — luciferase reporter for upstream regulation; RNA-seq identifies BIRC3 as downstream effector; single lab","pmids":["37577214"],"is_preprint":false},{"year":2016,"finding":"miR-26a-5p and miR-26b-5p directly target the PLOD2 3'UTR to suppress its expression, as validated by luciferase reporter assay. Downregulation of PLOD2 by these miRNAs significantly inhibits cancer cell migration and invasion in renal cell carcinoma.","method":"In silico analysis; luciferase reporter assay; miRNA restoration in RCC cell lines; migration/invasion assays; PLOD2 siRNA knockdown","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — luciferase validates direct miRNA targeting; functional cell assays confirm outcome; single lab","pmids":["26983694"],"is_preprint":false}],"current_model":"PLOD2 encodes a membrane-bound homodimeric 2-oxoglutarate-dependent dioxygenase (lysyl hydroxylase 2/LH2) that specifically hydroxylates lysine residues in the telopeptide domains of fibrillar procollagens, enabling formation of stable pyridinoline cross-links in the extracellular matrix; its expression is transcriptionally activated by HIF-1α (and STAT3, FOXA1, IRF5) and post-transcriptionally regulated by m6A modification (via METTL3/IGF2BP2) and miR-26a/b; PLOD2-mediated telopeptide lysine hydroxylation also stabilizes integrin β1 and promotes its plasma membrane localization to drive invasion, while PLOD2 enzymatic activity elevates cytoplasmic succinate to suppress 5hmC and promote EMT/stemness, and loss-of-function mutations in PLOD2 cause Bruck syndrome through deficient collagen telopeptide cross-linking in bone."},"narrative":{"mechanistic_narrative":"PLOD2 encodes telopeptide lysyl hydroxylase (LH2), a 2-oxoglutarate-dependent enzyme that hydroxylates lysine residues within the telopeptide domains of fibrillar collagens to enable formation of stable pyridinoline cross-links in the extracellular matrix [PMID:12881513]. Loss-of-function mutations in PLOD2 cause Bruck syndrome, in which deficient telopeptide lysine hydroxylation produces a near-complete absence of stable trivalent collagen cross-links in bone with their replacement by allysine aldol dimers, while cartilage type II collagen is normally hydroxylated, revealing tissue-specific control of cross-link chemistry [PMID:12881513, PMID:33778323]; a C-terminal hotspot (residues ~598-608) and the alternatively spliced exon 13a-containing isoform are specifically required for this catalytic function [PMID:15523624, PMID:22689593]. PLOD2 is a hypoxia-responsive gene activated by HIF-1, and its activity drives ECM stiffening, collagen fiber alignment, and the downstream changes in tumor cell adhesion and motility that accompany matrix remodeling [PMID:23423382]. Beyond collagen, PLOD2 hydroxylates integrin β1 to stabilize it and direct its plasma membrane localization, an event required for tumor cell motility and metastasis [PMID:32058962], and its enzymatic activity elevates cytoplasmic succinate that suppresses chromatin 5hmC to sustain mesenchymal and stemness phenotypes [PMID:37155842]. In bone and mesenchymal progenitors, a HIF-1α/PLOD2/LOX axis couples collagen cross-linking to glycolytic metabolism and osteogenic differentiation [PMID:38472175].","teleology":[{"year":2003,"claim":"Established the core molecular identity of PLOD2 as the telopeptide lysyl hydroxylase whose activity produces collagen pyridinoline cross-links, and tied its loss to human disease.","evidence":"Genetic mutation analysis of Bruck syndrome patients plus mRNA quantification and pyridinoline cross-link measurement in fibrotic fibroblasts","pmids":["12881513"],"confidence":"High","gaps":["Did not resolve the structural basis of telopeptide specificity","Did not address tissue-specific differences in cross-link chemistry"]},{"year":2004,"claim":"Localized a C-terminal functional hotspot critical for hydroxylase activity and showed that alternative splicing of exon 13A generates isoforms determining cross-link type.","evidence":"Mutation mapping with urine cross-link metabolite analysis; RT-PCR/Northern blot with cycloheximide perturbation in fibroblasts and kidney cells","pmids":["15523624","15694128"],"confidence":"Medium","gaps":["No enzyme assay directly linking the hotspot residues to catalysis","Factor controlling exon 13A inclusion not identified"]},{"year":2012,"claim":"Demonstrated that the exon 13a-containing long isoform is specifically required for normal bone telopeptide hydroxylation, refining the genotype-phenotype map.","evidence":"Homozygosity mapping and Sanger sequencing in consanguineous families","pmids":["22689593"],"confidence":"Medium","gaps":["No direct enzyme assay of isoform-specific activity","Mechanism distinguishing Bruck syndrome from OI without contractures unclear"]},{"year":2013,"claim":"Placed PLOD2 in the hypoxia response by showing HIF-1 drives its expression to remodel and stiffen the ECM, connecting collagen biochemistry to tumor-relevant biomechanics.","evidence":"siRNA knockdown in fibroblasts with ECM stiffness/fiber alignment assays, cancer cell co-culture, and HIF-1 ChIP/reporter","pmids":["23423382"],"confidence":"High","gaps":["Did not separate PLOD2 contribution from co-knocked P4HA1/P4HA2","Cross-link chemistry under hypoxia not directly measured"]},{"year":2016,"claim":"Identified post-transcriptional repression of PLOD2 by miR-26a/b, adding a layer of regulatory control over its tumor-promoting expression.","evidence":"Luciferase reporter on PLOD2 3'UTR plus miRNA restoration and migration/invasion assays in renal cell carcinoma","pmids":["26983694"],"confidence":"Medium","gaps":["Single-lab luciferase validation","In vivo relevance of miR-26-PLOD2 axis not tested"]},{"year":2018,"claim":"Revealed a non-canonical nuclear-associated partnership of PLOD2 with the histone demethylase KDM1A regulating mineralization and odontogenic/osteogenic differentiation.","evidence":"Co-IP for KDM1A-PLOD2, siRNA knockdown, ALP/Alizarin red assays, and in vivo transplantation in stem cells of the apical papilla","pmids":["29656462"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal structural validation","Whether interaction depends on PLOD2 enzymatic activity unknown"]},{"year":2017,"claim":"Established multiple transcriptional inputs (HIF-1α, FOXA1, TGF-β1) converging on PLOD2 to drive EMT, migration, and invasion across cancer types.","evidence":"siRNA knockdown with EMT/PI3K-AKT marker Westerns, FOXA1 ChIP on the PLOD2 promoter, β-catenin/focal adhesion imaging, and in vivo metastasis models in glioma, NSCLC, and cervical cancer","pmids":["28410212","29072684","28507454"],"confidence":"Medium","gaps":["EMT marker changes are correlative, not mechanistically dissected","Whether effects require collagen hydroxylation versus other substrates unresolved"]},{"year":2019,"claim":"Linked PLOD2 to cancer glucose metabolism through a STAT3-HK2 axis driving aerobic glycolysis.","evidence":"siRNA knockdown with HK2 overexpression rescue and glycolysis assays in colorectal cancer","pmids":["31742425"],"confidence":"Medium","gaps":["Mechanism by which PLOD2 activates STAT3 not defined","Single lab"]},{"year":2020,"claim":"Defined a substrate beyond collagen: PLOD2 hydroxylates integrin β1 to stabilize and traffic it to the plasma membrane, mechanistically connecting PLOD2 enzymatic activity to cell motility and metastasis.","evidence":"Loss-of-function with subcellular fractionation, in vivo metastasis model, and patient tissue co-expression in head and neck SCC","pmids":["32058962"],"confidence":"High","gaps":["Specific integrin β1 lysine sites not mapped","Generality across other adhesion receptors untested"]},{"year":2021,"claim":"Extended the integrin β1 axis upstream to the tumor microenvironment, showing M2-macrophage IL-6/STAT3 signaling drives PLOD2 to stabilize integrin β1, and characterized m6A-based post-transcriptional control via IGF2BP2.","evidence":"Luciferase reporter for STAT3 on PLOD2 promoter and tissue immunofluorescence in oral SCC; MeRIP/RIP-qPCR and CRISPR/dCas13b-ALKBH5 demethylation in varicocele testes","pmids":["33887877","37670228"],"confidence":"Medium","gaps":["Single-lab promoter and reader validation","Cross-tissue generality of m6A control unclear"]},{"year":2021,"claim":"Showed PLOD2 acts as a required effector downstream of L1CAM/ezrin/SMAD2-3 in cancer and downstream of TGF-β1/Smad3 in tissue repair, demonstrating context-dependent placement in signaling cascades.","evidence":"shRNA/enzymatic inhibition with in vivo tumorigenesis and liver metastasis in colorectal cancer; mechanical injury and rat SCI models with TGF-β1 inhibitor and PLOD2 knockdown","pmids":["33805564","33495412"],"confidence":"Medium","gaps":["Whether PLOD2 enzymatic substrate in these contexts is collagen or another protein unresolved","Single lab per context"]},{"year":2021,"claim":"Provided direct biochemical confirmation in patient tissue that PLOD2 loss specifically abolishes bone collagen telopeptide cross-links while sparing cartilage, defining tissue-specific cross-link chemistry.","evidence":"Mass spectrometry of bone collagen cross-linked peptides and urine-derived cartilage collagen from a Bruck syndrome patient","pmids":["33778323"],"confidence":"High","gaps":["Molecular basis of cartilage-specific compensation not identified","Single patient"]},{"year":2023,"claim":"Uncovered an enzymatic-metabolic-epigenetic mechanism in which PLOD2 activity elevates cytoplasmic succinate to suppress chromatin 5hmC and sustain stemness, linking the dioxygenase to epigenetic reprogramming.","evidence":"Stable isotope metabolomics, 5hmC ChIP-seq, PLOD2 silencing, and exogenous succinate rescue in breast cancer","pmids":["37155842"],"confidence":"High","gaps":["Enzymatic step generating excess succinate not pinpointed","Identity of 5hmC-writing dioxygenases inhibited not directly shown"]},{"year":2023,"claim":"Expanded PLOD2's protein-interaction repertoire to USP15 stabilization and EGFR binding driving AKT/mTOR signaling, and identified IRF5-PLOD2-BIRC3 as another regulatory axis, with minoxidil as a pharmacological inhibitor.","evidence":"Co-IP (USP15, EGFR), HIF1A/IRF5 promoter assays, AKT/mTOR phosphorylation Westerns, RNA-seq, in vivo xenografts, and minoxidil treatment in colorectal, renal, and hepatocellular carcinoma","pmids":["37227305","38008826","37577214"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation for each interaction","Whether these interactions require PLOD2 catalytic activity unknown"]},{"year":2024,"claim":"Integrated PLOD2 into a HIF-1α/PLOD2/LOX axis in mesenchymal progenitors coupling collagen cross-linking to glycolysis and osteogenic differentiation, and defined HIF-1α-driven METTL3-dependent m6A translational control of PLOD2.","evidence":"Conditional Hif1α knockout mouse with scRNA-seq and PLOD2 inhibition in heterotopic ossification; MeRIP-seq, METTL3 inhibitor, and AAV9-PLOD2 rescue in renal cell carcinoma","pmids":["38472175","38233403"],"confidence":"High","gaps":["Direct enzymatic link between PLOD2 and glycolytic flux not fully defined","How LOX cooperates mechanistically with PLOD2 unresolved"]},{"year":null,"claim":"It remains unresolved which PLOD2 substrate (collagen telopeptide lysines versus integrin β1 versus other proteins) and which activity (hydroxylation versus succinate generation versus protein scaffolding) dominates in each disease and cancer context.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of human PLOD2 with substrate","Substrate site-resolution for non-collagen targets missing","Catalytic dependence of reported protein-protein interactions untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,5,9]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[9]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,5]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[11,12]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,4,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,3,5]}],"complexes":[],"partners":["ITGB1","USP15","EGFR","KDM1A","IGF2BP2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00469","full_name":"Procollagen-lysine,2-oxoglutarate 5-dioxygenase 2","aliases":["Lysyl hydroxylase 2","LH2"],"length_aa":737,"mass_kda":84.7,"function":"Forms hydroxylysine residues in -Xaa-Lys-Gly- sequences in collagens. 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A study of five cases and review of the literature.","date":"2023","source":"Histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/38114270","citation_count":14,"is_preprint":false},{"pmid":"35660870","id":"PMC_35660870","title":"Silencing PLOD2 attenuates cancer stem cell-like characteristics and cisplatin-resistant through Integrin β1 in laryngeal cancer.","date":"2022","source":"Translational oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35660870","citation_count":14,"is_preprint":false},{"pmid":"35586565","id":"PMC_35586565","title":"Pan-Cancer Analyses Reveal Oncogenic and Immunological Role of PLOD2.","date":"2022","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35586565","citation_count":14,"is_preprint":false},{"pmid":"32284742","id":"PMC_32284742","title":"PLOD2 increases resistance of gastric cancer cells to 5-fluorouracil by upregulating BCRP and inhibiting apoptosis.","date":"2020","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/32284742","citation_count":14,"is_preprint":false},{"pmid":"34759745","id":"PMC_34759745","title":"CircRNA PLOD2 enhances ovarian cancer propagation by controlling miR-378.","date":"2021","source":"Saudi journal of biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/34759745","citation_count":14,"is_preprint":false},{"pmid":"37577214","id":"PMC_37577214","title":"Dysregulation of PLOD2 Promotes Tumor Metastasis and Invasion in Hepatocellular Carcinoma.","date":"2023","source":"Journal of clinical and translational hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/37577214","citation_count":13,"is_preprint":false},{"pmid":"19360408","id":"PMC_19360408","title":"The telomere-linked helicase (TLH) gene family in Magnaporthe oryzae: revised gene structure reveals a novel TLH-specific protein motif.","date":"2009","source":"Current genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19360408","citation_count":13,"is_preprint":false},{"pmid":"37477767","id":"PMC_37477767","title":"tDCS Regulates ASBT-3-OxoLCA-PLOD2-PTEN Signaling Pathway to Confer Neuroprotection Following Rat Cerebral Ischemia-Reperfusion Injury.","date":"2023","source":"Molecular neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/37477767","citation_count":13,"is_preprint":false},{"pmid":"37670228","id":"PMC_37670228","title":"N6-methyladenosine modification of PLOD2 causes spermatocyte damage in rats with varicocele.","date":"2023","source":"Cellular & molecular biology letters","url":"https://pubmed.ncbi.nlm.nih.gov/37670228","citation_count":12,"is_preprint":false},{"pmid":"11509374","id":"PMC_11509374","title":"Self diffusion and spectral modifications of a membrane protein, the Rubrivivax gelatinosus LH2 complex, incorporated into a monoolein cubic phase.","date":"2001","source":"Biophysical journal","url":"https://pubmed.ncbi.nlm.nih.gov/11509374","citation_count":12,"is_preprint":false},{"pmid":"16790242","id":"PMC_16790242","title":"Carotenoid stoichiometry in the LH2 crystal: no spectral evidence for the presence of the second molecule in the alpha/beta-apoprotein dimer.","date":"2006","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/16790242","citation_count":12,"is_preprint":false},{"pmid":"28612170","id":"PMC_28612170","title":"Emended description of the family Chromatiaceae, phylogenetic analyses of the genera Alishewanella, Rheinheimera and Arsukibacterium, transfer of Rheinheimera longhuensis LH2-2T to the genus Alishewanella and description of Alishewanella alkalitolerans sp. nov. from Lonar Lake, India.","date":"2017","source":"Antonie van Leeuwenhoek","url":"https://pubmed.ncbi.nlm.nih.gov/28612170","citation_count":11,"is_preprint":false},{"pmid":"16172925","id":"PMC_16172925","title":"Temperature broadening of LH2 absorption in glycerol solution.","date":"2005","source":"Photosynthesis research","url":"https://pubmed.ncbi.nlm.nih.gov/16172925","citation_count":11,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48881,"output_tokens":6307,"usd":0.120624,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15241,"output_tokens":4963,"usd":0.10014,"stage2_stop_reason":"end_turn"},"total_usd":0.220764,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"PLOD2 was identified as the telopeptide lysyl hydroxylase (TLH) responsible for hydroxylation of lysine residues within the telopeptides of fibrillar collagens. Two missense mutations in exon 17 of PLOD2 were found in Bruck syndrome patients who have pyridinoline cross-link deficiency in bone collagen, and fibrotic fibroblasts with elevated PLOD2 mRNA showed increased pyridinoline cross-link levels in deposited matrix, directly linking PLOD2 enzymatic activity to telopeptide lysine hydroxylation and collagen cross-linking.\",\n      \"method\": \"Genetic mutation analysis of Bruck syndrome patients; mRNA quantification and pyridinoline cross-link measurement in SSc fibroblasts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function (disease mutations) combined with biochemical cross-link assay in patient-derived fibroblasts; replicated by multiple subsequent studies\",\n      \"pmids\": [\"12881513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A hotspot region in the C-terminal domain of PLOD2 (residues ~598–608) is functionally critical for telopeptide lysyl hydroxylase activity; missense mutations (Arg598His, Gly601Val, Thr608Ile) in this region cause Bruck syndrome with pyridinoline deficiency and low collagen cross-link degradation products in urine.\",\n      \"method\": \"Mutation analysis of Bruck syndrome patient with Arg598His substitution; urine collagen cross-link metabolite analysis\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — disease mutation mapping with biochemical phenotype in a single patient; supports functional domain localization\",\n      \"pmids\": [\"15523624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PLOD2 exists as two alternatively spliced isoforms: a long form (including 63 bp exon 13A, ubiquitously expressed) and a short form (co-expressed in kidney, spleen, liver, placenta). The splicing of exon 13A is regulated by cell density and protein synthesis (cycloheximide treatment), suggesting a newly-synthesized factor controls inclusion of exon 13A. The relative expression of these isoforms determines the type of collagen cross-links formed.\",\n      \"method\": \"RT-PCR, Northern blot; cycloheximide treatment of human skin fibroblasts and kidney cells\",\n      \"journal\": \"Matrix biology : journal of the International Society for Matrix Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab with multiple cell types and pharmacological perturbation; functional consequences inferred from isoform differences\",\n      \"pmids\": [\"15694128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Homozygous frameshift mutations in the alternative exon 13a of PLOD2 are sufficient to cause Bruck syndrome, indicating that the longer PLOD2 protein isoform (encoded by exon 13a) is specifically required for normal telopeptide lysine hydroxylation in bone. Compound heterozygous PLOD2 mutations can also produce autosomal recessive OI phenotypes without joint contractures.\",\n      \"method\": \"Homozygosity mapping, Sanger sequencing, mutation analysis in consanguineous families\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function in multiple families establishing isoform-specific requirement; no direct enzyme assay\",\n      \"pmids\": [\"22689593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HIF-1 transcriptionally activates PLOD2 expression in fibroblasts under hypoxic conditions. PLOD2 is required for ECM stiffening and collagen fiber alignment under hypoxia; its loss (along with P4HA1/P4HA2) prevents hypoxia-induced ECM remodeling, collagen deposition, and downstream changes in breast cancer cell morphology, adhesion, and motility.\",\n      \"method\": \"siRNA knockdown of PLOD2 in fibroblasts; collagen fiber alignment and ECM stiffness assays; co-culture with breast cancer cells; HIF-1 ChIP/reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with multiple orthogonal functional readouts (ECM stiffness, fiber alignment, cancer cell motility); replicated across labs\",\n      \"pmids\": [\"23423382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Compound heterozygous PLOD2 mutations in a Bruck syndrome patient cause diminished hydroxylation specifically of type I collagen telopeptide lysines (but not triple-helical lysines), resulting in near-complete absence of stable trivalent collagen cross-links in bone and replacement by allysine aldol dimeric cross-links (as in skin). Cartilage type II collagen telopeptide lysines from the same patient were normally hydroxylated, revealing tissue-specific control of collagen cross-link chemistry.\",\n      \"method\": \"Mass spectrometry of bone collagen cross-linked peptides from patient biopsy; comparison with urine-derived cartilage collagen\",\n      \"journal\": \"JBMR plus\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct biochemical characterization (MS) of collagen cross-link chemistry in patient tissue; rigorous mechanistic linkage of PLOD2 loss to specific cross-link deficiency\",\n      \"pmids\": [\"33778323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PLOD2 knockdown in glioma cells inactivates the PI3K/AKT signaling pathway and downregulates EMT-associated markers (E-cadherin, vimentin, N-cadherin, β-catenin, snail, slug), inhibiting proliferation, migration, and invasion. PLOD2 expression is induced by HIF-1α under hypoxia, placing PLOD2 downstream of HIF-1α in hypoxia-driven EMT.\",\n      \"method\": \"siRNA knockdown; Western blot for PI3K/AKT and EMT markers; in vitro migration/invasion assays; in vivo xenograft\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with pathway marker readout and in vivo validation; single lab\",\n      \"pmids\": [\"28410212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PLOD2 is transcriptionally regulated by the transcription factor FOXA1 acting downstream of the EGFR-PI3K/AKT axis. FOXA1 directly binds the PLOD2 promoter to activate PLOD2 transcription in NSCLC cells. PLOD2 promotes metastasis directly by enhancing migration and indirectly by inducing collagen reorganization.\",\n      \"method\": \"ChIP assay of FOXA1 on PLOD2 promoter; gain- and loss-of-function studies; orthotopic metastasis model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding demonstrated by ChIP; functional rescue experiments; single lab\",\n      \"pmids\": [\"29072684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PLOD2 knockdown in cervical cancer cells inhibits cell migration, invasion, and adhesion to type I collagen. PLOD2 depletion prevents β-catenin nuclear translocation (blocking TGF-β1-induced EMT) and inhibits focal adhesion formation. Hypoxia and TGF-β1 each induce PLOD2 expression to promote these processes.\",\n      \"method\": \"siRNA knockdown; wound healing/Transwell assays; immunocytochemistry for β-catenin; phalloidin staining for focal adhesions; Western blot\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple orthogonal cellular readouts; single lab\",\n      \"pmids\": [\"28507454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PLOD2 hydroxylates integrin β1, and this hydroxylation is required for integrin β1 stabilization and recruitment to the plasma membrane. Loss of PLOD2 expression prevents integrin β1 from reaching its functional site (plasma membrane), abrogating tumor cell motility and metastasis in vivo in head and neck SCC.\",\n      \"method\": \"Loss-of-function studies; subcellular fractionation/membrane localization of integrin β1; in vivo metastasis model; co-expression analysis in patient tissue\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic linkage of PLOD2 hydroxylase activity to integrin β1 membrane localization with in vivo validation; replicated in follow-up study (PMID 33887877)\",\n      \"pmids\": [\"32058962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-6 released by CD163+ M2-type tumor-associated macrophages activates STAT3, which directly binds and activates the PLOD2 promoter in oral SCC cells, thereby increasing PLOD2 expression. This upregulation of PLOD2 stabilizes integrin β1 and promotes invasion/metastasis. IL-6 stimulation did not directly affect integrin β1 expression or maturation.\",\n      \"method\": \"Dual-luciferase reporter assay for STAT3 binding to PLOD2 promoter; siRNA; immunofluorescence double staining for IL-6 and CD163 in patient tissue\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding shown by luciferase reporter; supported by tissue immunofluorescence; single lab\",\n      \"pmids\": [\"33887877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PLOD2 expression is associated with elevated cytoplasmic succinate levels during EMT. PLOD2 silencing in breast cancer cells reduces succinate levels and inhibits mesenchymal phenotypes and stemness, accompanied by increased 5-hydroxymethylcytosine (5hmC) in chromatin. Exogenous succinate rescues stemness and 5hmC levels in PLOD2-silenced cells, indicating PLOD2 promotes cancer progression at least partly through succinate-mediated epigenetic regulation.\",\n      \"method\": \"Stable isotope-resolved metabolomics; ChIP-seq for 5hmC; PLOD2 silencing; exogenous succinate rescue experiment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — metabolomics plus ChIP-seq plus rescue experiment establish novel PLOD2-succinate-5hmC axis; multiple orthogonal methods in single study\",\n      \"pmids\": [\"37155842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PLOD2 interacts with USP15 (ubiquitin-specific protease 15) and stabilizes USP15 in the cytoplasm, leading to activation of AKT/mTOR phosphorylation and promotion of colorectal cancer proliferation, invasion, and metastasis. The PLOD2 inhibitor minoxidil downregulates PLOD2, suppresses USP15, and inhibits AKT/mTOR phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation; Western blot for AKT/mTOR phosphorylation; overexpression and knockdown; in vivo xenograft; minoxidil pharmacological inhibition\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP establishes PLOD2–USP15 interaction; AKT/mTOR activation shown by Western blot; single lab\",\n      \"pmids\": [\"37227305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PLOD2 binds to the extracellular domain of EGFR, leading to EGFR phosphorylation and downstream AKT signaling pathway activation in clear cell renal cell carcinoma. HIF1A transcriptionally activates PLOD2 by binding a specific promoter region. PLOD2 inhibitor minoxidil suppresses ccRCC progression by inactivating the EGFR/AKT axis.\",\n      \"method\": \"Co-immunoprecipitation (PLOD2–EGFR interaction); HIF1A ChIP on PLOD2 promoter; phosphorylation assays; knockdown/overexpression; in vivo xenograft; minoxidil treatment\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP for PLOD2-EGFR interaction plus functional validation; single lab; HIF1A promoter binding shown by ChIP\",\n      \"pmids\": [\"38008826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PLOD2 promotes aerobic glycolysis in colorectal cancer cells by upregulating hexokinase 2 (HK2) expression via the STAT3 signaling pathway. HK2 overexpression reverses the inhibitory effects of PLOD2 knockdown, establishing a PLOD2–STAT3–HK2 functional axis in glucose metabolism.\",\n      \"method\": \"siRNA knockdown of PLOD2; HK2 overexpression rescue; Western blot for STAT3 and HK2; glycolysis assays\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — rescue experiment with HK2 supports epistatic relationship; single lab, two methods\",\n      \"pmids\": [\"31742425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KDM1A (histone demethylase) associates with PLOD2 to form a protein complex in stem cells of the apical papilla (SCAPs). Knockdown of either KDM1A or PLOD2 inhibits alkaline phosphatase activity and mineralization and promotes expression of osteo/dentinogenic differentiation markers (DSPP, DMP1, BSP, RUNX2, OSX, DLX2).\",\n      \"method\": \"Co-immunoprecipitation (KDM1A–PLOD2 interaction); siRNA knockdown; ALP assay; Alizarin red staining; in vivo transplantation\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP establishes complex; functional knockdown with multiple differentiation markers; single lab\",\n      \"pmids\": [\"29656462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"METTL3-mediated m6A modification of PLOD2 mRNA at its 3'UTR promotes PLOD2 protein translation under prolonged hypoxia. HIF-1α binds the METTL3 promoter to enhance its transcription, and METTL3 in turn increases PLOD2 protein levels in an m6A-dependent manner to promote renal cell carcinoma progression. AAV9-mediated re-transduction of PLOD2 rescued tumor growth suppressed by METTL3 inhibition in vivo.\",\n      \"method\": \"MeRIP-seq; METTL3 inhibitor STM2457; AAV9-PLOD2 rescue in vivo; HIF-1α ChIP on METTL3 promoter; Western blot\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP-seq identifies m6A site; in vivo rescue establishes epistasis; single lab\",\n      \"pmids\": [\"38233403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IGF2BP2 binds to the m6A-modified 3'UTR of PLOD2 mRNA and positively regulates PLOD2 mRNA stability in varicocele rat testes. Targeted demethylation of PLOD2 m6A by a CRISPR/dCas13b-ALKBH5 system decreases PLOD2 expression and promotes GC-2 cell proliferation while inhibiting apoptosis under oxidative stress.\",\n      \"method\": \"MeRIP-seq/qPCR; RIP-qPCR; luciferase assay for IGF2BP2–PLOD2 mRNA interaction; CRISPR/dCas13b-ALKBH5 demethylation; cell proliferation/apoptosis assays\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-qPCR and luciferase establish IGF2BP2 as m6A reader; CRISPR demethylation validates functional consequence; single lab\",\n      \"pmids\": [\"37670228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PLOD2 is required for L1CAM-driven colorectal cancer proliferation, motility, tumorigenesis, and liver metastasis. L1CAM upregulates PLOD2 expression via ezrin signaling and SMAD2/3 pathway activation. Suppression of endogenous PLOD2 expression or inhibition of its enzymatic activity blocks the tumorigenic properties conferred by L1CAM.\",\n      \"method\": \"shRNA-mediated PLOD2 knockdown; enzymatic inhibition; tumorigenesis/liver metastasis assays in vivo; Western blot for SMAD2/3\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic placement of PLOD2 downstream of L1/ezrin/SMAD; enzymatic activity requirement demonstrated; single lab\",\n      \"pmids\": [\"33805564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Adipose-derived stromal cells (ADSCs) upregulate PLOD2 in spinal cord neurons via TGF-β1 secretion and downstream Smad3 phosphorylation. PLOD2 upregulation is required for the neuroprotective/neurorestorative effects of ADSCs after spinal cord injury; inhibiting TGF-β1 signaling (with SB431542) or PLOD2 expression abrogates neuronal survival, axonal regeneration promotion, and functional recovery.\",\n      \"method\": \"In vitro mechanical injury model; rat SCI model; PLOD2 knockdown; TGF-β1 receptor inhibitor SB431542; immunostaining for MAP2, NSE, GAP43, GFAP\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and pharmacological inhibition with defined pathway and in vivo readout; single lab\",\n      \"pmids\": [\"33495412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HIF-1α activates PLOD2 expression in mesenchymal progenitor cells, and the HIF-1α/PLOD2/LOX axis regulates collagen cross-linking, glucose metabolism, and osteogenic differentiation. Inhibition of PLOD2 activity significantly decreases osteogenic differentiation and glycolytic metabolism in MPCs, and genetic deletion of Hif1α in zeugopod mesenchymal cells reduces PLOD2/LOX pathway activity and mitigates heterotopic ossification in vivo.\",\n      \"method\": \"Conditional Hif1α knockout mouse (Hoxa11-CreERT2; Hif1afl/fl); scRNA-seq; pharmacological PLOD2 inhibition; osteogenic differentiation assays; glycolysis measurement\",\n      \"journal\": \"Bone research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic KO with scRNA-seq pathway analysis plus pharmacological PLOD2 inhibition with metabolic and differentiation readouts; multiple orthogonal methods\",\n      \"pmids\": [\"38472175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PLOD2 is transcriptionally regulated by interferon regulatory factor 5 (IRF5) in hepatocellular carcinoma cells, as shown by a luciferase reporter assay. PLOD2 in turn promotes HCC metastasis via upregulation of BIRC3 (baculoviral IAP repeat containing 3), placing PLOD2 in an IRF5–PLOD2–BIRC3 signaling axis.\",\n      \"method\": \"Luciferase reporter assay (IRF5 → PLOD2 promoter); RNA sequencing; PLOD2 knockdown with downstream BIRC3 measurement; in vivo metastasis model\",\n      \"journal\": \"Journal of clinical and translational hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — luciferase reporter for upstream regulation; RNA-seq identifies BIRC3 as downstream effector; single lab\",\n      \"pmids\": [\"37577214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"miR-26a-5p and miR-26b-5p directly target the PLOD2 3'UTR to suppress its expression, as validated by luciferase reporter assay. Downregulation of PLOD2 by these miRNAs significantly inhibits cancer cell migration and invasion in renal cell carcinoma.\",\n      \"method\": \"In silico analysis; luciferase reporter assay; miRNA restoration in RCC cell lines; migration/invasion assays; PLOD2 siRNA knockdown\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — luciferase validates direct miRNA targeting; functional cell assays confirm outcome; single lab\",\n      \"pmids\": [\"26983694\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PLOD2 encodes a membrane-bound homodimeric 2-oxoglutarate-dependent dioxygenase (lysyl hydroxylase 2/LH2) that specifically hydroxylates lysine residues in the telopeptide domains of fibrillar procollagens, enabling formation of stable pyridinoline cross-links in the extracellular matrix; its expression is transcriptionally activated by HIF-1α (and STAT3, FOXA1, IRF5) and post-transcriptionally regulated by m6A modification (via METTL3/IGF2BP2) and miR-26a/b; PLOD2-mediated telopeptide lysine hydroxylation also stabilizes integrin β1 and promotes its plasma membrane localization to drive invasion, while PLOD2 enzymatic activity elevates cytoplasmic succinate to suppress 5hmC and promote EMT/stemness, and loss-of-function mutations in PLOD2 cause Bruck syndrome through deficient collagen telopeptide cross-linking in bone.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PLOD2 encodes telopeptide lysyl hydroxylase (LH2), a 2-oxoglutarate-dependent enzyme that hydroxylates lysine residues within the telopeptide domains of fibrillar collagens to enable formation of stable pyridinoline cross-links in the extracellular matrix [#0]. Loss-of-function mutations in PLOD2 cause Bruck syndrome, in which deficient telopeptide lysine hydroxylation produces a near-complete absence of stable trivalent collagen cross-links in bone with their replacement by allysine aldol dimers, while cartilage type II collagen is normally hydroxylated, revealing tissue-specific control of cross-link chemistry [#0, #5]; a C-terminal hotspot (residues ~598-608) and the alternatively spliced exon 13a-containing isoform are specifically required for this catalytic function [#1, #3]. PLOD2 is a hypoxia-responsive gene activated by HIF-1, and its activity drives ECM stiffening, collagen fiber alignment, and the downstream changes in tumor cell adhesion and motility that accompany matrix remodeling [#4]. Beyond collagen, PLOD2 hydroxylates integrin \\u03b21 to stabilize it and direct its plasma membrane localization, an event required for tumor cell motility and metastasis [#9], and its enzymatic activity elevates cytoplasmic succinate that suppresses chromatin 5hmC to sustain mesenchymal and stemness phenotypes [#11]. In bone and mesenchymal progenitors, a HIF-1\\u03b1/PLOD2/LOX axis couples collagen cross-linking to glycolytic metabolism and osteogenic differentiation [#20].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established the core molecular identity of PLOD2 as the telopeptide lysyl hydroxylase whose activity produces collagen pyridinoline cross-links, and tied its loss to human disease.\",\n      \"evidence\": \"Genetic mutation analysis of Bruck syndrome patients plus mRNA quantification and pyridinoline cross-link measurement in fibrotic fibroblasts\",\n      \"pmids\": [\"12881513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural basis of telopeptide specificity\", \"Did not address tissue-specific differences in cross-link chemistry\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Localized a C-terminal functional hotspot critical for hydroxylase activity and showed that alternative splicing of exon 13A generates isoforms determining cross-link type.\",\n      \"evidence\": \"Mutation mapping with urine cross-link metabolite analysis; RT-PCR/Northern blot with cycloheximide perturbation in fibroblasts and kidney cells\",\n      \"pmids\": [\"15523624\", \"15694128\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzyme assay directly linking the hotspot residues to catalysis\", \"Factor controlling exon 13A inclusion not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated that the exon 13a-containing long isoform is specifically required for normal bone telopeptide hydroxylation, refining the genotype-phenotype map.\",\n      \"evidence\": \"Homozygosity mapping and Sanger sequencing in consanguineous families\",\n      \"pmids\": [\"22689593\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct enzyme assay of isoform-specific activity\", \"Mechanism distinguishing Bruck syndrome from OI without contractures unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed PLOD2 in the hypoxia response by showing HIF-1 drives its expression to remodel and stiffen the ECM, connecting collagen biochemistry to tumor-relevant biomechanics.\",\n      \"evidence\": \"siRNA knockdown in fibroblasts with ECM stiffness/fiber alignment assays, cancer cell co-culture, and HIF-1 ChIP/reporter\",\n      \"pmids\": [\"23423382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate PLOD2 contribution from co-knocked P4HA1/P4HA2\", \"Cross-link chemistry under hypoxia not directly measured\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified post-transcriptional repression of PLOD2 by miR-26a/b, adding a layer of regulatory control over its tumor-promoting expression.\",\n      \"evidence\": \"Luciferase reporter on PLOD2 3'UTR plus miRNA restoration and migration/invasion assays in renal cell carcinoma\",\n      \"pmids\": [\"26983694\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab luciferase validation\", \"In vivo relevance of miR-26-PLOD2 axis not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed a non-canonical nuclear-associated partnership of PLOD2 with the histone demethylase KDM1A regulating mineralization and odontogenic/osteogenic differentiation.\",\n      \"evidence\": \"Co-IP for KDM1A-PLOD2, siRNA knockdown, ALP/Alizarin red assays, and in vivo transplantation in stem cells of the apical papilla\",\n      \"pmids\": [\"29656462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal structural validation\", \"Whether interaction depends on PLOD2 enzymatic activity unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established multiple transcriptional inputs (HIF-1\\u03b1, FOXA1, TGF-\\u03b21) converging on PLOD2 to drive EMT, migration, and invasion across cancer types.\",\n      \"evidence\": \"siRNA knockdown with EMT/PI3K-AKT marker Westerns, FOXA1 ChIP on the PLOD2 promoter, \\u03b2-catenin/focal adhesion imaging, and in vivo metastasis models in glioma, NSCLC, and cervical cancer\",\n      \"pmids\": [\"28410212\", \"29072684\", \"28507454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EMT marker changes are correlative, not mechanistically dissected\", \"Whether effects require collagen hydroxylation versus other substrates unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked PLOD2 to cancer glucose metabolism through a STAT3-HK2 axis driving aerobic glycolysis.\",\n      \"evidence\": \"siRNA knockdown with HK2 overexpression rescue and glycolysis assays in colorectal cancer\",\n      \"pmids\": [\"31742425\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which PLOD2 activates STAT3 not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a substrate beyond collagen: PLOD2 hydroxylates integrin \\u03b21 to stabilize and traffic it to the plasma membrane, mechanistically connecting PLOD2 enzymatic activity to cell motility and metastasis.\",\n      \"evidence\": \"Loss-of-function with subcellular fractionation, in vivo metastasis model, and patient tissue co-expression in head and neck SCC\",\n      \"pmids\": [\"32058962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific integrin \\u03b21 lysine sites not mapped\", \"Generality across other adhesion receptors untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended the integrin \\u03b21 axis upstream to the tumor microenvironment, showing M2-macrophage IL-6/STAT3 signaling drives PLOD2 to stabilize integrin \\u03b21, and characterized m6A-based post-transcriptional control via IGF2BP2.\",\n      \"evidence\": \"Luciferase reporter for STAT3 on PLOD2 promoter and tissue immunofluorescence in oral SCC; MeRIP/RIP-qPCR and CRISPR/dCas13b-ALKBH5 demethylation in varicocele testes\",\n      \"pmids\": [\"33887877\", \"37670228\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab promoter and reader validation\", \"Cross-tissue generality of m6A control unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed PLOD2 acts as a required effector downstream of L1CAM/ezrin/SMAD2-3 in cancer and downstream of TGF-\\u03b21/Smad3 in tissue repair, demonstrating context-dependent placement in signaling cascades.\",\n      \"evidence\": \"shRNA/enzymatic inhibition with in vivo tumorigenesis and liver metastasis in colorectal cancer; mechanical injury and rat SCI models with TGF-\\u03b21 inhibitor and PLOD2 knockdown\",\n      \"pmids\": [\"33805564\", \"33495412\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PLOD2 enzymatic substrate in these contexts is collagen or another protein unresolved\", \"Single lab per context\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided direct biochemical confirmation in patient tissue that PLOD2 loss specifically abolishes bone collagen telopeptide cross-links while sparing cartilage, defining tissue-specific cross-link chemistry.\",\n      \"evidence\": \"Mass spectrometry of bone collagen cross-linked peptides and urine-derived cartilage collagen from a Bruck syndrome patient\",\n      \"pmids\": [\"33778323\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of cartilage-specific compensation not identified\", \"Single patient\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Uncovered an enzymatic-metabolic-epigenetic mechanism in which PLOD2 activity elevates cytoplasmic succinate to suppress chromatin 5hmC and sustain stemness, linking the dioxygenase to epigenetic reprogramming.\",\n      \"evidence\": \"Stable isotope metabolomics, 5hmC ChIP-seq, PLOD2 silencing, and exogenous succinate rescue in breast cancer\",\n      \"pmids\": [\"37155842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzymatic step generating excess succinate not pinpointed\", \"Identity of 5hmC-writing dioxygenases inhibited not directly shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Expanded PLOD2's protein-interaction repertoire to USP15 stabilization and EGFR binding driving AKT/mTOR signaling, and identified IRF5-PLOD2-BIRC3 as another regulatory axis, with minoxidil as a pharmacological inhibitor.\",\n      \"evidence\": \"Co-IP (USP15, EGFR), HIF1A/IRF5 promoter assays, AKT/mTOR phosphorylation Westerns, RNA-seq, in vivo xenografts, and minoxidil treatment in colorectal, renal, and hepatocellular carcinoma\",\n      \"pmids\": [\"37227305\", \"38008826\", \"37577214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation for each interaction\", \"Whether these interactions require PLOD2 catalytic activity unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Integrated PLOD2 into a HIF-1\\u03b1/PLOD2/LOX axis in mesenchymal progenitors coupling collagen cross-linking to glycolysis and osteogenic differentiation, and defined HIF-1\\u03b1-driven METTL3-dependent m6A translational control of PLOD2.\",\n      \"evidence\": \"Conditional Hif1\\u03b1 knockout mouse with scRNA-seq and PLOD2 inhibition in heterotopic ossification; MeRIP-seq, METTL3 inhibitor, and AAV9-PLOD2 rescue in renal cell carcinoma\",\n      \"pmids\": [\"38472175\", \"38233403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct enzymatic link between PLOD2 and glycolytic flux not fully defined\", \"How LOX cooperates mechanistically with PLOD2 unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved which PLOD2 substrate (collagen telopeptide lysines versus integrin \\u03b21 versus other proteins) and which activity (hydroxylation versus succinate generation versus protein scaffolding) dominates in each disease and cancer context.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of human PLOD2 with substrate\", \"Substrate site-resolution for non-collagen targets missing\", \"Catalytic dependence of reported protein-protein interactions untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 5, 9]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 3, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ITGB1\", \"USP15\", \"EGFR\", \"KDM1A\", \"IGF2BP2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}