{"gene":"TH","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2011,"finding":"Chronic manganese (Mn) exposure decreases TH enzymatic activity in dopaminergic neurons through activation of PKCδ, which in turn increases protein phosphatase 2A (PP2A) activity; the PKCδ inhibitor rottlerin prevents Mn-induced reduction in TH activity and PP2A activation, placing PKCδ-PP2A signaling upstream of TH regulation.","method":"In vitro enzymatic activity assays, pharmacological inhibition (rottlerin), kinase activity assays in differentiated mesencephalic dopaminergic neuronal cells","journal":"Toxicology and applied pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct TH activity assay with specific pharmacological inhibitor, multiple readouts (TH activity, TH-Ser40 phosphorylation, PP2A activity), single lab","pmids":["21310168"],"is_preprint":false},{"year":2013,"finding":"Morphine and morphine withdrawal regulate TH mRNA expression and TH activity (but not TH-positive neuron number) in the mesolimbic dopaminergic pathway, with changes in Argonaute 2 (Ago2) protein levels suggesting Ago2-induced translational repression of TH mRNA during morphine withdrawal; acute morphine increases TH activity and dopamine turnover in the nucleus accumbens, while precipitated withdrawal decreases TH activation.","method":"Western blot, quantitative RT-PCR, TH activity assay, immunohistochemistry in rat VTA/NAc","journal":"Addiction biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (protein, mRNA, activity) in a single lab; mechanistic link between Ago2 and TH mRNA proposed but not fully reconstituted","pmids":["23927484"],"is_preprint":false},{"year":2017,"finding":"HMGB1 upregulates TH mRNA expression in dopaminergic neurons via activation of its receptor RAGE, which signals through JNK phosphorylation; RAGE inhibitors and JNK inhibitors both block rHMGB1-induced TH upregulation, and rHMGB1 partially rescues MPP+-induced TH mRNA reduction without altering cell survival.","method":"Pharmacological inhibition of RAGE and JNK, qRT-PCR, treatment of SN4741 dopaminergic cells with recombinant HMGB1 and MPP+","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — specific inhibitor experiments with two independent pathway inhibitors, single lab, single cell line","pmids":["28887039"],"is_preprint":false},{"year":2023,"finding":"TH is the rate-limiting enzyme in catecholamine biosynthesis; GTP cyclohydrolase I (GCH1) provides the essential cofactor tetrahydrobiopterin (BH4) for TH activity; hereditary GCH1 deficiency reduces BH4 levels and consequently reduces TH activity and dopamine synthesis, causing DOPA-responsive dystonia (DRD/Segawa disease); severe TH deficiency itself causes juvenile Parkinsonism, and both conditions are treatable with L-DOPA.","method":"Biochemical characterization, human genetic studies, enzyme activity measurements in patient tissues and cell lines (historical overview synthesizing direct experimental evidence)","journal":"Journal of neural transmission","confidence":"High","confidence_rationale":"Tier 1 / Strong — enzymatic mechanism replicated across decades by multiple labs; GCH1-BH4-TH pathway biochemically established by reconstitution and genetic evidence","pmids":["37638996"],"is_preprint":false},{"year":2017,"finding":"Tyrosine hydroxylase (TH) and calcitonin-related polypeptide alpha (Cgrpα) are expressed in opposing gradients along cochlear type II spiral ganglion neurons, with TH preferentially expressed in apical and Cgrpα in basal type II afferent neurons; TH serves as a selective biomarker of type II versus type I cochlear afferents and marks a subpopulation consistent with low-threshold mechanoreceptive C-fibers.","method":"Immunofluorescence, double-labeling with molecular markers, confocal microscopy in whole-mount cochlear preparations from CGRPα-EGFP mice","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment with multiple orthogonal markers, functional context (nociceptor vs. mechanoreceptor identity), single lab","pmids":["29055051"],"is_preprint":false},{"year":2016,"finding":"Hemizygous TH-Cre mice show preserved TH protein levels, dopamine levels, dopamine turnover, dopamine transporter expression/function, and normal dopamine-related behaviors (locomotion, reward, anxiety), validating the TH-Cre line as a tool without constitutive dopaminergic disruption.","method":"Western blot, HPLC for dopamine and metabolites, radioligand binding/uptake assays, behavioral testing (locomotor activity, conditioned place preference, elevated plus maze) in TH-Cre vs. wild-type mice","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical and behavioral assays, single lab; establishes negative result (no constitutive TH dysregulation) with rigorous controls","pmids":["27453291"],"is_preprint":false},{"year":2014,"finding":"Co-transfection of TH (tyrosine hydroxylase) with the transcription factor Brn4 into neural stem cells synergistically promotes differentiation into mature dopaminergic neurons expressing the late marker dopamine transporter (DAT); TH alone produces morphologically immature DA neurons that rarely express DAT, while Brn4 co-expression also induces GDNF and its receptors GFRα-1 and Ret, contributing to maturation and survival.","method":"Retroviral/lentiviral transduction, immunofluorescence, flow cytometry, Western blot in neural stem cell cultures","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gain-of-function with two transgenes, multiple phenotypic readouts, single lab","pmids":["24769320"],"is_preprint":false},{"year":2010,"finding":"Stereological counting of TH-positive (TH+) and TH-negative (TH-) neurons in the mouse ventral midbrain reveals that neuron counts differ depending on detection method (chromogenic vs. fluorescence) and nuclear marker (Nissl, DAPI, or NeuN); fluorescence detection and NeuN marker yield higher counts of both TH+ and TH- neurons, establishing methodological parameters for accurate TH+ neuron quantification.","method":"Epifluorescence stereology, chromogenic immunohistochemistry, NeuN/DAPI/Nissl nuclear markers in mouse and rat ventral midbrain","journal":"Experimental neurology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — methodological characterization study, single lab, no functional consequence of TH localization tested","pmids":["20637754"],"is_preprint":false}],"current_model":"Tyrosine hydroxylase (TH) is the rate-limiting enzyme in catecholamine biosynthesis that hydroxylates L-tyrosine to L-DOPA, requiring tetrahydrobiopterin (BH4, supplied by GCH1) as cofactor; TH activity is negatively regulated by a PKCδ–PP2A signaling axis (relevant to manganese toxicity), positively upregulated by extracellular HMGB1 via RAGE–JNK signaling, and modulated by Ago2-dependent translational mechanisms during opioid exposure; TH expression marks specific dopaminergic neuron populations (including cochlear type II afferents) and its co-expression with Brn4 synergistically drives maturation of dopaminergic neurons from neural stem cells."},"narrative":{"mechanistic_narrative":"Tyrosine hydroxylase (TH) is the rate-limiting enzyme of catecholamine biosynthesis, converting L-tyrosine to L-DOPA and thereby setting the pace of dopamine synthesis in dopaminergic neurons [PMID:37638996]. Its catalytic output depends on tetrahydrobiopterin (BH4) supplied by GTP cyclohydrolase I (GCH1); hereditary GCH1 deficiency lowers BH4 and secondarily reduces TH activity and dopamine synthesis, causing DOPA-responsive dystonia, while severe TH deficiency itself causes juvenile Parkinsonism, both treatable with L-DOPA [PMID:37638996]. TH activity is dynamically regulated by upstream signaling: chronic manganese exposure suppresses TH activity through a PKCδ–PP2A axis acting on TH-Ser40 phosphorylation [PMID:21310168], whereas extracellular HMGB1 raises TH mRNA via RAGE–JNK signaling and partially rescues MPP+-induced TH loss [PMID:28887039]. In the mesolimbic pathway, morphine and morphine withdrawal modulate TH mRNA, activity, and dopamine turnover, with Argonaute 2 implicated in translational repression of TH mRNA during withdrawal [PMID:23927484]. Beyond its enzymatic role, TH expression marks defined neuronal populations, including apical cochlear type II afferents [PMID:29055051], and TH together with Brn4 synergistically drives maturation of dopaminergic neurons from neural stem cells toward a DAT-expressing phenotype [PMID:24769320].","teleology":[{"year":2010,"claim":"Establishing reliable quantification of TH-positive neurons was needed before TH could serve as a robust marker of dopaminergic populations in lesion and disease models.","evidence":"Stereological counting comparing chromogenic vs. fluorescence detection and Nissl/DAPI/NeuN markers in mouse and rat ventral midbrain","pmids":["20637754"],"confidence":"Low","gaps":["Methodological study only; no functional consequence of TH localization tested","Does not address TH regulation or enzymatic mechanism"]},{"year":2011,"claim":"Identified an upstream signaling axis that negatively regulates TH activity, explaining how an environmental neurotoxin suppresses dopamine synthesis.","evidence":"TH activity and TH-Ser40 phosphorylation assays with PKCδ inhibitor rottlerin and PP2A activity measurement in differentiated mesencephalic dopaminergic cells exposed to manganese","pmids":["21310168"],"confidence":"Medium","gaps":["Direct PP2A-mediated dephosphorylation of TH not reconstituted","Single lab, in vitro cell system","In vivo relevance to manganese neurotoxicity not established here"]},{"year":2013,"claim":"Linked opioid exposure to TH regulation at the translational level, distinguishing changes in enzyme activity from changes in neuron number.","evidence":"Western blot, qRT-PCR, TH activity assay and immunohistochemistry in rat VTA/NAc after acute morphine and precipitated withdrawal","pmids":["23927484"],"confidence":"Medium","gaps":["Ago2-mediated translational repression of TH mRNA proposed but not fully reconstituted","Direct Ago2–TH mRNA interaction not demonstrated"]},{"year":2014,"claim":"Showed that TH alone is insufficient to generate mature dopaminergic neurons, requiring a transcription-factor partner to complete maturation.","evidence":"Co-transfection of TH with Brn4 into neural stem cells, with immunofluorescence, flow cytometry and Western blot for DAT, GDNF, GFRα-1, and Ret","pmids":["24769320"],"confidence":"Medium","gaps":["Mechanism by which Brn4 induces GDNF/Ret signaling not resolved","Functional integration and survival of derived neurons in vivo not tested"]},{"year":2016,"claim":"Validated the TH-Cre mouse line as a genetic tool, confirming that hemizygous Cre insertion does not constitutively disrupt the dopaminergic system.","evidence":"Western blot, HPLC for dopamine/metabolites, radioligand binding/uptake, and behavioral testing in TH-Cre vs. wild-type mice","pmids":["27453291"],"confidence":"Medium","gaps":["Negative-result validation; does not address TH enzymatic mechanism","Subtle or conditional phenotypes not excluded"]},{"year":2017,"claim":"Identified a positive transcriptional regulator of TH, connecting an inflammatory/danger signal to dopamine-synthesis capacity.","evidence":"Recombinant HMGB1 and MPP+ treatment of SN4741 dopaminergic cells with RAGE and JNK inhibitors and qRT-PCR readout","pmids":["28887039"],"confidence":"Medium","gaps":["Single cell line, single lab","Transcription factors downstream of JNK acting on the TH promoter not identified","In vivo relevance not established"]},{"year":2017,"claim":"Defined TH as a selective marker of a specific peripheral neuronal subpopulation, extending its diagnostic utility beyond central dopaminergic neurons.","evidence":"Immunofluorescence double-labeling and confocal microscopy of whole-mount cochlea from CGRPα-EGFP mice","pmids":["29055051"],"confidence":"Medium","gaps":["Functional role of TH in type II afferents not tested","Whether TH produces catecholamines in these cells not addressed"]},{"year":2023,"claim":"Consolidated the biochemical and genetic basis of TH function, establishing the GCH1–BH4–TH pathway and its disease consequences.","evidence":"Biochemical characterization, human genetic studies, and enzyme activity measurements in patient tissues and cell lines (synthesizing review)","pmids":["37638996"],"confidence":"High","gaps":["Structural basis of BH4-dependent catalysis not detailed in this corpus","Phosphorylation-dependent activity regulation not integrated with cofactor supply here"]},{"year":null,"claim":"How the multiple regulatory inputs on TH (PKCδ–PP2A phosphorylation, HMGB1–RAGE–JNK transcription, Ago2 translational control, and BH4 cofactor supply) are coordinated within a single dopaminergic neuron remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No integrated model linking transcriptional, translational, and post-translational control of TH","Cell-type-specific regulatory logic across central vs. peripheral TH+ populations not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[3]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[1,4]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P07101","full_name":"Tyrosine 3-monooxygenase","aliases":["Tyrosine 3-hydroxylase","TH"],"length_aa":528,"mass_kda":58.6,"function":"Catalyzes the conversion of L-tyrosine to L-dihydroxyphenylalanine (L-Dopa), the rate-limiting step in the biosynthesis of catecholamines, dopamine, noradrenaline, and adrenaline. Uses tetrahydrobiopterin and molecular oxygen to convert tyrosine to L-Dopa (PubMed:15287903, PubMed:1680128, PubMed:17391063, PubMed:24753243, PubMed:34922205, PubMed:8528210, Ref.18). In addition to tyrosine, is able to catalyze the hydroxylation of phenylalanine and tryptophan with lower specificity (By similarity). Positively regulates the regression of retinal hyaloid vessels during postnatal development (By similarity) Lacks catalytic activity Lacks catalytic activity","subcellular_location":"Cytoplasm, perinuclear region; Nucleus; Cell projection, axon; Cytoplasm; Cytoplasmic vesicle, secretory vesicle, synaptic vesicle","url":"https://www.uniprot.org/uniprotkb/P07101/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TH","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TH","total_profiled":1310},"omim":[{"mim_id":"621542","title":"ARRESTIN DOMAIN-CONTAINING PROTEIN 2; ARRDC2","url":"https://www.omim.org/entry/621542"},{"mim_id":"621537","title":"CPS1 INTRONIC TRANSCRIPT 1, NONCODING; CPS1IT1","url":"https://www.omim.org/entry/621537"},{"mim_id":"621450","title":"ACTIN-RELATED PROTEIN 2/3 COMPLEX, SUBUNIT 5-LIKE; ARPC5L","url":"https://www.omim.org/entry/621450"},{"mim_id":"621215","title":"NANOG HOMEOBOX RETROGENE P8; NANOGP8","url":"https://www.omim.org/entry/621215"},{"mim_id":"621077","title":"5-PRIME-@NUCLEOTIDASE DOMAIN-CONTAINING PROTEIN 2; NT5DC2","url":"https://www.omim.org/entry/621077"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"adrenal gland","ntpm":185.6},{"tissue":"brain","ntpm":129.8}],"url":"https://www.proteinatlas.org/search/TH"},"hgnc":{"alias_symbol":["DYT5b"],"prev_symbol":[]},"alphafold":{"accession":"P07101","domains":[{"cath_id":"3.30.70.260","chopping":"105-188","consensus_level":"high","plddt":81.6283,"start":105,"end":188},{"cath_id":"1.10.800.10","chopping":"200-486","consensus_level":"high","plddt":94.6183,"start":200,"end":486},{"cath_id":"-","chopping":"489-528","consensus_level":"medium","plddt":92.0795,"start":489,"end":528}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07101","model_url":"https://alphafold.ebi.ac.uk/files/AF-P07101-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P07101-F1-predicted_aligned_error_v6.png","plddt_mean":80.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TH","jax_strain_url":"https://www.jax.org/strain/search?query=TH"},"sequence":{"accession":"P07101","fasta_url":"https://rest.uniprot.org/uniprotkb/P07101.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07101/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07101"}},"corpus_meta":[{"pmid":"11086043","id":"PMC_11086043","title":"Microbial 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Disorders.","date":"2022","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35320935","citation_count":38,"is_preprint":false},{"pmid":"29666810","id":"PMC_29666810","title":"The 8th TNM edition for lung cancer: a critical analysis.","date":"2018","source":"Annals of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/29666810","citation_count":38,"is_preprint":false},{"pmid":"25078507","id":"PMC_25078507","title":"150(th) anniversary series: Desmosomes and autoimmune disease, perspective of dynamic desmosome remodeling and its impairments in pemphigus.","date":"2014","source":"Cell communication & adhesion","url":"https://pubmed.ncbi.nlm.nih.gov/25078507","citation_count":38,"is_preprint":false},{"pmid":"29747740","id":"PMC_29747740","title":"Auraptene regulates Th1/Th2/TReg balances, NF-κB nuclear localization and nitric oxide production in normal and Th2 provoked situations in human isolated lymphocytes.","date":"2018","source":"Phytomedicine : 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nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/23920047","citation_count":22,"is_preprint":false},{"pmid":"17986780","id":"PMC_17986780","title":"Dietary melibiose regulates th cell response and enhances the induction of oral tolerance.","date":"2007","source":"Bioscience, biotechnology, and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17986780","citation_count":21,"is_preprint":false},{"pmid":"34218114","id":"PMC_34218114","title":"Bisphenols disrupt thyroid hormone (TH) signaling in the brain and affect TH-dependent brain development in Xenopus laevis.","date":"2021","source":"Aquatic toxicology (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/34218114","citation_count":21,"is_preprint":false},{"pmid":"29283120","id":"PMC_29283120","title":"Correlation of interleukin-33 with Th cytokines and clinical severity of dry eye disease.","date":"2018","source":"Indian journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/29283120","citation_count":21,"is_preprint":false},{"pmid":"11164989","id":"PMC_11164989","title":"Th(1)/Th(2) responses to drugs.","date":"2001","source":"Toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/11164989","citation_count":20,"is_preprint":false},{"pmid":"35514979","id":"PMC_35514979","title":"Role of Toll-Like Receptors and Th Responses in Viral Myocarditis.","date":"2022","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35514979","citation_count":20,"is_preprint":false},{"pmid":"28887039","id":"PMC_28887039","title":"Activation of the HMGB1-RAGE axis upregulates TH expression in dopaminergic neurons via JNK phosphorylation.","date":"2017","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/28887039","citation_count":20,"is_preprint":false},{"pmid":"30809474","id":"PMC_30809474","title":"Th lymphocyte subsets in patients with Vogt-Koyanagi-Harada disease.","date":"2019","source":"International journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/30809474","citation_count":20,"is_preprint":false},{"pmid":"11591742","id":"PMC_11591742","title":"Induction of CTL and nonpolarized Th cell responses by CD8alpha(+) and CD8alpha(-) dendritic cells.","date":"2001","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/11591742","citation_count":20,"is_preprint":false},{"pmid":"10843768","id":"PMC_10843768","title":"TH(1)- and TH(2)-TYPE cytokine expression by activated t lymphocytes from the lung and spleen during the inflammatory response to respiratory syncytial virus.","date":"2000","source":"Cytokine","url":"https://pubmed.ncbi.nlm.nih.gov/10843768","citation_count":20,"is_preprint":false},{"pmid":"27514780","id":"PMC_27514780","title":"Cloning and characterization of tyrosine hydroxylase (TH) from the pacific white leg shrimp Litopenaeus vannamei, and its expression following pathogen challenge and hypothermal stress.","date":"2016","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27514780","citation_count":20,"is_preprint":false},{"pmid":"32244791","id":"PMC_32244791","title":"Identification of Toxoplasma Gondii Tyrosine Hydroxylase (TH) Activity and Molecular Immunoprotection against Toxoplasmosis.","date":"2020","source":"Vaccines","url":"https://pubmed.ncbi.nlm.nih.gov/32244791","citation_count":20,"is_preprint":false},{"pmid":"31028121","id":"PMC_31028121","title":"Runx1 and RORγt Cooperate to Upregulate IL-22 Expression in Th Cells through Its Distal Enhancer.","date":"2019","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/31028121","citation_count":19,"is_preprint":false},{"pmid":"29500637","id":"PMC_29500637","title":"RNA-Seq Profile Reveals Th-1 and Th-17-Type of Immune Responses in Mice Infected Systemically with Aspergillus fumigatus.","date":"2018","source":"Mycopathologia","url":"https://pubmed.ncbi.nlm.nih.gov/29500637","citation_count":19,"is_preprint":false},{"pmid":"33665581","id":"PMC_33665581","title":"Regulation of peripheral Th/Treg differentiation and suppression of airway inflammation by Nr4a transcription factors.","date":"2021","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/33665581","citation_count":19,"is_preprint":false},{"pmid":"27633963","id":"PMC_27633963","title":"Maternal Genetic Ancestry and Legacy of 10(th) Century AD Hungarians.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27633963","citation_count":19,"is_preprint":false},{"pmid":"33324407","id":"PMC_33324407","title":"Cytokine Signature in Schnitzler Syndrome: Proinflammatory Cytokine Production Associated to Th Suppression.","date":"2020","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/33324407","citation_count":19,"is_preprint":false},{"pmid":"27434108","id":"PMC_27434108","title":"Th-1, Th-2 Cytokines Profile among Madurella mycetomatis Eumycetoma Patients.","date":"2016","source":"PLoS neglected tropical diseases","url":"https://pubmed.ncbi.nlm.nih.gov/27434108","citation_count":17,"is_preprint":false},{"pmid":"23626923","id":"PMC_23626923","title":"Role of TH-17 cells in rheumatic and other autoimmune diseases.","date":"2011","source":"Rheumatology (Sunnyvale, Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/23626923","citation_count":17,"is_preprint":false},{"pmid":"37638996","id":"PMC_37638996","title":"Catecholamines and Parkinson's disease: tyrosine hydroxylase (TH) over tetrahydrobiopterin (BH4) and GTP cyclohydrolase I (GCH1) to cytokines, neuromelanin, and gene therapy: a historical overview.","date":"2023","source":"Journal of neural transmission (Vienna, Austria : 1996)","url":"https://pubmed.ncbi.nlm.nih.gov/37638996","citation_count":16,"is_preprint":false},{"pmid":"28100679","id":"PMC_28100679","title":"Etv5 Regulates IL-10 Production in Th Cells.","date":"2017","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/28100679","citation_count":16,"is_preprint":false},{"pmid":"27453291","id":"PMC_27453291","title":"Preserved dopaminergic homeostasis and dopamine-related behaviour in hemizygous TH-Cre mice.","date":"2016","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/27453291","citation_count":16,"is_preprint":false},{"pmid":"23412693","id":"PMC_23412693","title":"Distribution and functional plasticity of peripheral blood Th(c)17 and Th(c)1 in rheumatoid arthritis.","date":"2013","source":"Rheumatology international","url":"https://pubmed.ncbi.nlm.nih.gov/23412693","citation_count":16,"is_preprint":false},{"pmid":"18435915","id":"PMC_18435915","title":"Isoeleutherin and eleutherinol, naturally occurring selective modulators of Th cell-mediated immune responses.","date":"2008","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/18435915","citation_count":16,"is_preprint":false},{"pmid":"20637754","id":"PMC_20637754","title":"Number and nuclear morphology of TH+ and TH- neurons in the mouse ventral midbrain using epifluorescence stereology.","date":"2010","source":"Experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/20637754","citation_count":16,"is_preprint":false},{"pmid":"11592074","id":"PMC_11592074","title":"Regulation of ST2L expression on T helper (Th) type 2 cells.","date":"2001","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/11592074","citation_count":16,"is_preprint":false},{"pmid":"20415784","id":"PMC_20415784","title":"Cell-mediated immune response and Th/Th cytokine profile of B-T constructs of F1 and V antigen of Yersinia pestis.","date":"2010","source":"Scandinavian journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/20415784","citation_count":16,"is_preprint":false},{"pmid":"16210796","id":"PMC_16210796","title":"Canine tyrosine hydroxylase (TH) gene and dopamine beta -hydroxylase (DBH) gene: their sequences, genetic polymorphisms, and diversities among five different dog breeds.","date":"2005","source":"The Journal of veterinary medical science","url":"https://pubmed.ncbi.nlm.nih.gov/16210796","citation_count":16,"is_preprint":false},{"pmid":"33096947","id":"PMC_33096947","title":"Hypoxic targeting and activating TH-302 loaded transcatheter arterial embolization microsphere.","date":"2020","source":"Drug delivery","url":"https://pubmed.ncbi.nlm.nih.gov/33096947","citation_count":15,"is_preprint":false},{"pmid":"24769320","id":"PMC_24769320","title":"Brn4 and TH synergistically promote the differentiation of neural stem cells into dopaminergic neurons.","date":"2014","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/24769320","citation_count":15,"is_preprint":false},{"pmid":"39325360","id":"PMC_39325360","title":"Unraveling Th subsets: insights into their role in immune checkpoint inhibitor therapy.","date":"2024","source":"Cellular oncology (Dordrecht, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/39325360","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49191,"output_tokens":2548,"usd":0.092897,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9424,"output_tokens":2933,"usd":0.060222,"stage2_stop_reason":"end_turn"},"total_usd":0.153119,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about the canonical TH gene (tyrosine hydroxylase, also known as DYT5b) — the rate-limiting enzyme in catecholamine/dopamine biosynthesis — versus the many papers about \"Th\" as an abbreviation for \"T helper cells,\" which is a completely different entity.\n\nPapers about tyrosine hydroxylase (TH gene): 30, 61, 63, 76, 89, 91, 94, 99 (and partially 50, 80, 81, 97)\n\nPapers about T helper cells (Th): irrelevant to the TH gene query — these use \"Th\" as an abbreviation for T helper cells.\n\nOther collisions: Paper 8/98 (TH-302, a drug), Paper 14 (TH = Tec homology domain), Paper 15 (TH = thyroid hormone), Paper 16 (MRP/Th RNA), Paper 40 (Th* convergence temperature), Paper 64 (Th/To ribonucleoprotein), Paper 65 (TH signaling = thyroid hormone) — all excluded.\n\nNow extracting mechanistic discoveries from TH (tyrosine hydroxylase) papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"Chronic manganese (Mn) exposure decreases TH enzymatic activity in dopaminergic neurons through activation of PKCδ, which in turn increases protein phosphatase 2A (PP2A) activity; the PKCδ inhibitor rottlerin prevents Mn-induced reduction in TH activity and PP2A activation, placing PKCδ-PP2A signaling upstream of TH regulation.\",\n      \"method\": \"In vitro enzymatic activity assays, pharmacological inhibition (rottlerin), kinase activity assays in differentiated mesencephalic dopaminergic neuronal cells\",\n      \"journal\": \"Toxicology and applied pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct TH activity assay with specific pharmacological inhibitor, multiple readouts (TH activity, TH-Ser40 phosphorylation, PP2A activity), single lab\",\n      \"pmids\": [\"21310168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Morphine and morphine withdrawal regulate TH mRNA expression and TH activity (but not TH-positive neuron number) in the mesolimbic dopaminergic pathway, with changes in Argonaute 2 (Ago2) protein levels suggesting Ago2-induced translational repression of TH mRNA during morphine withdrawal; acute morphine increases TH activity and dopamine turnover in the nucleus accumbens, while precipitated withdrawal decreases TH activation.\",\n      \"method\": \"Western blot, quantitative RT-PCR, TH activity assay, immunohistochemistry in rat VTA/NAc\",\n      \"journal\": \"Addiction biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (protein, mRNA, activity) in a single lab; mechanistic link between Ago2 and TH mRNA proposed but not fully reconstituted\",\n      \"pmids\": [\"23927484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HMGB1 upregulates TH mRNA expression in dopaminergic neurons via activation of its receptor RAGE, which signals through JNK phosphorylation; RAGE inhibitors and JNK inhibitors both block rHMGB1-induced TH upregulation, and rHMGB1 partially rescues MPP+-induced TH mRNA reduction without altering cell survival.\",\n      \"method\": \"Pharmacological inhibition of RAGE and JNK, qRT-PCR, treatment of SN4741 dopaminergic cells with recombinant HMGB1 and MPP+\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — specific inhibitor experiments with two independent pathway inhibitors, single lab, single cell line\",\n      \"pmids\": [\"28887039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TH is the rate-limiting enzyme in catecholamine biosynthesis; GTP cyclohydrolase I (GCH1) provides the essential cofactor tetrahydrobiopterin (BH4) for TH activity; hereditary GCH1 deficiency reduces BH4 levels and consequently reduces TH activity and dopamine synthesis, causing DOPA-responsive dystonia (DRD/Segawa disease); severe TH deficiency itself causes juvenile Parkinsonism, and both conditions are treatable with L-DOPA.\",\n      \"method\": \"Biochemical characterization, human genetic studies, enzyme activity measurements in patient tissues and cell lines (historical overview synthesizing direct experimental evidence)\",\n      \"journal\": \"Journal of neural transmission\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — enzymatic mechanism replicated across decades by multiple labs; GCH1-BH4-TH pathway biochemically established by reconstitution and genetic evidence\",\n      \"pmids\": [\"37638996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Tyrosine hydroxylase (TH) and calcitonin-related polypeptide alpha (Cgrpα) are expressed in opposing gradients along cochlear type II spiral ganglion neurons, with TH preferentially expressed in apical and Cgrpα in basal type II afferent neurons; TH serves as a selective biomarker of type II versus type I cochlear afferents and marks a subpopulation consistent with low-threshold mechanoreceptive C-fibers.\",\n      \"method\": \"Immunofluorescence, double-labeling with molecular markers, confocal microscopy in whole-mount cochlear preparations from CGRPα-EGFP mice\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment with multiple orthogonal markers, functional context (nociceptor vs. mechanoreceptor identity), single lab\",\n      \"pmids\": [\"29055051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hemizygous TH-Cre mice show preserved TH protein levels, dopamine levels, dopamine turnover, dopamine transporter expression/function, and normal dopamine-related behaviors (locomotion, reward, anxiety), validating the TH-Cre line as a tool without constitutive dopaminergic disruption.\",\n      \"method\": \"Western blot, HPLC for dopamine and metabolites, radioligand binding/uptake assays, behavioral testing (locomotor activity, conditioned place preference, elevated plus maze) in TH-Cre vs. wild-type mice\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical and behavioral assays, single lab; establishes negative result (no constitutive TH dysregulation) with rigorous controls\",\n      \"pmids\": [\"27453291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Co-transfection of TH (tyrosine hydroxylase) with the transcription factor Brn4 into neural stem cells synergistically promotes differentiation into mature dopaminergic neurons expressing the late marker dopamine transporter (DAT); TH alone produces morphologically immature DA neurons that rarely express DAT, while Brn4 co-expression also induces GDNF and its receptors GFRα-1 and Ret, contributing to maturation and survival.\",\n      \"method\": \"Retroviral/lentiviral transduction, immunofluorescence, flow cytometry, Western blot in neural stem cell cultures\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gain-of-function with two transgenes, multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"24769320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Stereological counting of TH-positive (TH+) and TH-negative (TH-) neurons in the mouse ventral midbrain reveals that neuron counts differ depending on detection method (chromogenic vs. fluorescence) and nuclear marker (Nissl, DAPI, or NeuN); fluorescence detection and NeuN marker yield higher counts of both TH+ and TH- neurons, establishing methodological parameters for accurate TH+ neuron quantification.\",\n      \"method\": \"Epifluorescence stereology, chromogenic immunohistochemistry, NeuN/DAPI/Nissl nuclear markers in mouse and rat ventral midbrain\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — methodological characterization study, single lab, no functional consequence of TH localization tested\",\n      \"pmids\": [\"20637754\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Tyrosine hydroxylase (TH) is the rate-limiting enzyme in catecholamine biosynthesis that hydroxylates L-tyrosine to L-DOPA, requiring tetrahydrobiopterin (BH4, supplied by GCH1) as cofactor; TH activity is negatively regulated by a PKCδ–PP2A signaling axis (relevant to manganese toxicity), positively upregulated by extracellular HMGB1 via RAGE–JNK signaling, and modulated by Ago2-dependent translational mechanisms during opioid exposure; TH expression marks specific dopaminergic neuron populations (including cochlear type II afferents) and its co-expression with Brn4 synergistically drives maturation of dopaminergic neurons from neural stem cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Tyrosine hydroxylase (TH) is the rate-limiting enzyme of catecholamine biosynthesis, converting L-tyrosine to L-DOPA and thereby setting the pace of dopamine synthesis in dopaminergic neurons [#3]. Its catalytic output depends on tetrahydrobiopterin (BH4) supplied by GTP cyclohydrolase I (GCH1); hereditary GCH1 deficiency lowers BH4 and secondarily reduces TH activity and dopamine synthesis, causing DOPA-responsive dystonia, while severe TH deficiency itself causes juvenile Parkinsonism, both treatable with L-DOPA [#3]. TH activity is dynamically regulated by upstream signaling: chronic manganese exposure suppresses TH activity through a PKC\\u03b4\\u2013PP2A axis acting on TH-Ser40 phosphorylation [#0], whereas extracellular HMGB1 raises TH mRNA via RAGE\\u2013JNK signaling and partially rescues MPP+-induced TH loss [#2]. In the mesolimbic pathway, morphine and morphine withdrawal modulate TH mRNA, activity, and dopamine turnover, with Argonaute 2 implicated in translational repression of TH mRNA during withdrawal [#1]. Beyond its enzymatic role, TH expression marks defined neuronal populations, including apical cochlear type II afferents [#4], and TH together with Brn4 synergistically drives maturation of dopaminergic neurons from neural stem cells toward a DAT-expressing phenotype [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing reliable quantification of TH-positive neurons was needed before TH could serve as a robust marker of dopaminergic populations in lesion and disease models.\",\n      \"evidence\": \"Stereological counting comparing chromogenic vs. fluorescence detection and Nissl/DAPI/NeuN markers in mouse and rat ventral midbrain\",\n      \"pmids\": [\"20637754\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Methodological study only; no functional consequence of TH localization tested\",\n        \"Does not address TH regulation or enzymatic mechanism\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified an upstream signaling axis that negatively regulates TH activity, explaining how an environmental neurotoxin suppresses dopamine synthesis.\",\n      \"evidence\": \"TH activity and TH-Ser40 phosphorylation assays with PKC\\u03b4 inhibitor rottlerin and PP2A activity measurement in differentiated mesencephalic dopaminergic cells exposed to manganese\",\n      \"pmids\": [\"21310168\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct PP2A-mediated dephosphorylation of TH not reconstituted\",\n        \"Single lab, in vitro cell system\",\n        \"In vivo relevance to manganese neurotoxicity not established here\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked opioid exposure to TH regulation at the translational level, distinguishing changes in enzyme activity from changes in neuron number.\",\n      \"evidence\": \"Western blot, qRT-PCR, TH activity assay and immunohistochemistry in rat VTA/NAc after acute morphine and precipitated withdrawal\",\n      \"pmids\": [\"23927484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Ago2-mediated translational repression of TH mRNA proposed but not fully reconstituted\",\n        \"Direct Ago2\\u2013TH mRNA interaction not demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed that TH alone is insufficient to generate mature dopaminergic neurons, requiring a transcription-factor partner to complete maturation.\",\n      \"evidence\": \"Co-transfection of TH with Brn4 into neural stem cells, with immunofluorescence, flow cytometry and Western blot for DAT, GDNF, GFR\\u03b1-1, and Ret\",\n      \"pmids\": [\"24769320\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which Brn4 induces GDNF/Ret signaling not resolved\",\n        \"Functional integration and survival of derived neurons in vivo not tested\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Validated the TH-Cre mouse line as a genetic tool, confirming that hemizygous Cre insertion does not constitutively disrupt the dopaminergic system.\",\n      \"evidence\": \"Western blot, HPLC for dopamine/metabolites, radioligand binding/uptake, and behavioral testing in TH-Cre vs. wild-type mice\",\n      \"pmids\": [\"27453291\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Negative-result validation; does not address TH enzymatic mechanism\",\n        \"Subtle or conditional phenotypes not excluded\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified a positive transcriptional regulator of TH, connecting an inflammatory/danger signal to dopamine-synthesis capacity.\",\n      \"evidence\": \"Recombinant HMGB1 and MPP+ treatment of SN4741 dopaminergic cells with RAGE and JNK inhibitors and qRT-PCR readout\",\n      \"pmids\": [\"28887039\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single cell line, single lab\",\n        \"Transcription factors downstream of JNK acting on the TH promoter not identified\",\n        \"In vivo relevance not established\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined TH as a selective marker of a specific peripheral neuronal subpopulation, extending its diagnostic utility beyond central dopaminergic neurons.\",\n      \"evidence\": \"Immunofluorescence double-labeling and confocal microscopy of whole-mount cochlea from CGRP\\u03b1-EGFP mice\",\n      \"pmids\": [\"29055051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional role of TH in type II afferents not tested\",\n        \"Whether TH produces catecholamines in these cells not addressed\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Consolidated the biochemical and genetic basis of TH function, establishing the GCH1\\u2013BH4\\u2013TH pathway and its disease consequences.\",\n      \"evidence\": \"Biochemical characterization, human genetic studies, and enzyme activity measurements in patient tissues and cell lines (synthesizing review)\",\n      \"pmids\": [\"37638996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of BH4-dependent catalysis not detailed in this corpus\",\n        \"Phosphorylation-dependent activity regulation not integrated with cofactor supply here\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple regulatory inputs on TH (PKC\\u03b4\\u2013PP2A phosphorylation, HMGB1\\u2013RAGE\\u2013JNK transcription, Ago2 translational control, and BH4 cofactor supply) are coordinated within a single dopaminergic neuron remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No integrated model linking transcriptional, translational, and post-translational control of TH\",\n        \"Cell-type-specific regulatory logic across central vs. peripheral TH+ populations not defined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}