{"gene":"LDHA","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2017,"finding":"LDHA is phosphorylated at tyrosine 10 (Y10) by upstream kinases HER2 and Src; this phosphorylation activates LDHA enzymatic activity and promotes cancer cell invasion, anoikis resistance, and tumor metastasis through redox homeostasis (ROS regulation). Expression of phospho-deficient LDHA Y10F sensitized cells to anoikis and elevated ROS, while lactate or antioxidant NAC reversed these phenotypes.","method":"Site-directed mutagenesis (Y10F), kinase inhibitor treatment, shRNA knockdown, in vitro LDH activity assay, xenograft metastasis model, patient sample correlation","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of active site residue, multiple orthogonal methods (activity assay, rescue experiments, in vivo model, clinical samples), single lab but rigorous","pmids":["28218905"],"is_preprint":false},{"year":2022,"finding":"LDHA interacts with active Rac1 (Rac1-GTP) to inhibit its interaction with GTPase-activating proteins (GAPs), thereby sustaining Rac1 activation independently of LDHA's glycolytic enzyme activity. This noncanonical oncogenic mechanism promotes cancer cell growth, and combination inhibition of LDHA enzyme activity plus Rac1 shows synergistic anti-tumor effects in breast cancer.","method":"Co-immunoprecipitation, pulldown assays, Rac1-GTP activity assays, glycolytic-activity-dead LDHA mutants, in vivo breast cancer models, clinical sample analysis","journal":"Nature metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, activity-dead mutants, in vivo and clinical validation, multiple orthogonal methods","pmids":["36536137"],"is_preprint":false},{"year":2020,"finding":"Under inflammatory conditions, NF-κB activation in chondrocytes promotes metabolic reprogramming toward LDHA. LDHA binds NADH and promotes reactive oxygen species (ROS) generation, which stabilizes IκB-ζ, a pro-inflammatory mediator, inducing catabolic changes in chondrocytes relevant to osteoarthritis pathogenesis.","method":"NF-κB pathway modulation, LDHA knockdown/overexpression, ROS measurement, IκB-ζ protein stability assays, in vivo OA models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (binding assay, ROS measurement, pathway modulation, in vivo model), published in high-impact journal","pmids":["32647171"],"is_preprint":false},{"year":2022,"finding":"LDHA interacts with eukaryotic elongation factor 2 (eEF2) in the cytoplasm in an NADH-dependent manner, sequestering eEF2 from ribosomes and thereby controlling translation. LDHA knockout in megakaryocytes releases eEF2 to participate in translation, accelerating megakaryocyte maturation and platelet production. This function is independent of LDHA's lactate-producing activity.","method":"Co-immunoprecipitation, MK/platelet-specific Ldha knockout mice, in vitro translation assays, NADH-competitive LDHA inhibitors, platelet count measurements, human cord blood MK differentiation","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP demonstrating direct interaction, genetic knockout, NADH-dependence mechanistic dissection, multiple orthogonal approaches","pmids":["35176139"],"is_preprint":false},{"year":2023,"finding":"The lncRNA GLTC binds LDHA and competitively inhibits the interaction between SIRT5 (a desuccinylase) and LDHA, thereby promoting succinylation of LDHA at lysine 155 (K155). K155 succinylation increases LDHA enzymatic activity and aerobic glycolysis; expression of a succinylation-mimetic LDHAK155E mutant rescues glycolysis in GLTC-depleted cells.","method":"Mass spectrometry identification of succinylation site, Co-immunoprecipitation, SIRT5 competition assay, site-directed mutagenesis (K155E succinylation mimetic), in vitro enzymatic activity assay, in vivo xenograft model","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mass spectrometry PTM identification, mutagenesis, Co-IP competition assay, activity assay, in vivo validation, multiple orthogonal methods","pmids":["37031273"],"is_preprint":false},{"year":2024,"finding":"LDHA is palmitoylated by the palmitoyltransferase ZDHHC9 at cysteine 163. This palmitoylation promotes LDHA enzymatic activity, increases lactate production, and reduces ROS generation. A palmitoylation-deficient LDHA mutant (C163A) reduces pancreatic cancer cell proliferation and tumor growth, and LDHA palmitoylation is upregulated in gemcitabine-resistant cells.","method":"Palmitoylation site mapping, ZDHHC9 knockdown/overexpression, palmitoylation-deficient mutant (C163A), in vitro LDHA activity assay, ROS measurement, xenograft tumor model","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — PTM writer identified (ZDHHC9), specific site mapped (C163), mutagenesis, enzymatic activity assay, in vivo validation","pmids":["38331089"],"is_preprint":false},{"year":2014,"finding":"Transcription factor FOXM1 directly binds to the LDHA promoter and transcriptionally activates LDHA gene expression, thereby upregulating LDH enzymatic activity, lactate production, and glucose utilization in pancreatic cancer cells.","method":"Chromatin immunoprecipitation (ChIP) assay, luciferase reporter assay, FOXM1 overexpression/knockdown, LDH activity measurement, in vivo pancreatic cancer models","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ChIP demonstrating promoter binding, luciferase reporter validation, in vivo animal model, multiple orthogonal methods","pmids":["24634381"],"is_preprint":false},{"year":2014,"finding":"Transcription factor KLF4 directly binds to the LDHA gene promoter and negatively regulates its transcription, suppressing LDHA expression and aerobic glycolysis in pancreatic cancer cells.","method":"Chromatin immunoprecipitation (ChIP) assay, KLF4 overexpression/knockdown, LDHA promoter reporter assay, glycolysis measurements (glucose consumption, lactate production), orthotopic mouse model","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ChIP demonstrating promoter binding, multiple cell biology assays, in vivo orthotopic model","pmids":["24947925"],"is_preprint":false},{"year":2017,"finding":"HIF-1α and HIF-2α bind to the LDHA promoter at an HRE site 89 bp upstream under hypoxic conditions, directly activating LDHA transcription in pancreatic cancer cells. Knockdown of HIF-1α and HIF-2α decreases LDHA expression, lactate production, and glucose utilization even under hypoxia.","method":"Chromatin immunoprecipitation (ChIP) assay, luciferase reporter assay, HIF-1α/HIF-2α siRNA knockdown, lactate and glucose measurements, immunofluorescence in patient specimens","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ChIP + luciferase confirming promoter binding, genetic validation, patient sample confirmation","pmids":["28193910"],"is_preprint":false},{"year":2024,"finding":"FKBP10 binds directly to LDHA through its C-terminal region and enhances LDHA phosphorylation at tyrosine 10 (Y10), resulting in hyperactive Warburg effect and accumulation of histone lactylation in clear cell renal cell carcinoma.","method":"Co-immunoprecipitation, domain mapping experiments, phospho-LDHA Y10 western blotting, FKBP10 knockdown/overexpression, in vivo xenograft models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, phosphorylation assay, in vivo validation; single lab","pmids":["38233415"],"is_preprint":false},{"year":2022,"finding":"The circular RNA circVAMP3 directly interacts with LDHA and facilitates LDHA phosphorylation at tyrosine 10 (Y10) by the upstream kinase FGFR1, thereby increasing LDHA enzymatic activity and promoting aerobic glycolysis and proliferation in renal cell carcinoma.","method":"RNA pulldown assay, Co-immunoprecipitation, LDHA Y10 phosphorylation assay, FGFR1 inhibitor treatment, circVAMP3 knockdown/overexpression, glycolysis measurements","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — RNA pulldown + Co-IP identifying direct interaction, Y10 phosphorylation assay, FGFR1 epistasis; single lab","pmids":["35525866"],"is_preprint":false},{"year":2018,"finding":"PGC1β transcriptionally upregulates LDHA expression through the PGC1β/RXRβ axis acting on the LDHA promoter, promoting glycolytic metabolism and tumor growth in multiple myeloma.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay with LDHA deletion constructs, siRNA knockdown, stable overexpression cell lines, in vivo xenograft model","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP + luciferase reporter with deletion constructs, in vivo validation; single lab","pmids":["30051603"],"is_preprint":false},{"year":2016,"finding":"LDHA-associated lactic acid accumulation in tumors inhibits the function and survival of T and NK cells by preventing upregulation of NFAT, resulting in diminished IFN-γ production. This mechanism was established using Ldha-low tumor cells in immunocompetent vs. immunodeficient (Rag2−/−γc−/−) and Ifng−/− mice.","method":"Ldha knockdown tumor cells, immunocompetent and immunodeficient mouse models, genetic epistasis (Rag2−/−γc−/−, Ifng−/− mice), NFAT activity measurement, IFN-γ production assays, pathophysiological lactic acid treatment of T/NK cells","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using multiple mouse models, NFAT signaling mechanistic dissection, in vivo + in vitro orthogonal methods","pmids":["27641098"],"is_preprint":false},{"year":2022,"finding":"LDHA-mediated metabolic reprogramming promotes cardiomyocyte (CM) proliferation by: (1) inhibiting succinylation-dependent ubiquitination of thioredoxin reductase 1 (Txnrd1) via succinyl-CoA reduction, thus alleviating ROS; and (2) driving lactate production that induces M2 macrophage polarization. CM-specific LDHA knockout inhibited CM proliferation; CM-specific overexpression promoted cardiac repair post-MI.","method":"CRISPR/Cas9 CM-specific knockout mice, CM-specific overexpression, metabolomics, proteomics, Co-immunoprecipitation (Txnrd1 interaction), flow cytometry for macrophage polarization, cardiac function measurements","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying Txnrd1 interaction, genetic KO/OE mouse models, metabolomics; single lab with multiple methods","pmids":["36057161"],"is_preprint":false},{"year":2017,"finding":"JMJD2A (a histone demethylase) binds to the LDHA promoter region and transcriptionally activates LDHA expression in nasopharyngeal carcinoma, promoting the Warburg effect. JMJD2A alteration selectively affects LDHA among glycolytic enzymes.","method":"Chromatin immunoprecipitation (ChIP) assay, JMJD2A knockdown/overexpression, glycolysis measurements (ATP, lactate production, glucose utilization), IHC in patient specimens","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct promoter binding, functional glycolysis assays; single lab","pmids":["28693517"],"is_preprint":false},{"year":2019,"finding":"MTA1 (metastasis-associated protein 1) interacts with c-Myc and the MTA1-c-Myc complex is recruited to the LDHA promoter to regulate LDHA transcription in breast cancer, thereby controlling LDHA expression and subsequent cell migration.","method":"Co-immunoprecipitation (MTA1-c-Myc interaction), ChIP assay (promoter occupancy), LDHA siRNA knockdown in MTA1-overexpressing MCF7 cells, migration assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP + ChIP, functional rescue; single lab","pmids":["31570164"],"is_preprint":false},{"year":2023,"finding":"NUSAP1 binds to both c-Myc and HIF-1α to form a transcription regulatory complex that localizes to the LDHA promoter and enhances LDHA expression. In a feedforward loop, LDHA-produced lactate upregulates NUSAP1 by inhibiting its protein degradation through lysine lactylation (Kla) modification.","method":"ChIP-seq and CHIP-qPCR (complex localization to LDHA promoter), Co-IP (NUSAP1-c-Myc-HIF-1α complex), mass spectrometry (lactylation modification), RNA-seq, xenograft/spontaneous PDAC models","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq + Co-IP + mass spectrometry PTM identification, in vivo validation; single lab","pmids":["37354982"],"is_preprint":false},{"year":2021,"finding":"KDM6B histone demethylase directly mediates H3K27me3 demethylation at the LDHA locus, thereby increasing LDHA expression in osteosarcoma and promoting tumor metastasis. Overexpression of LDHA reversed the metastasis inhibition observed upon KDM6B knockdown.","method":"ChIP-seq + RNA-seq analysis identifying LDHA as KDM6B target, ChIP-qPCR validating H3K27me3 changes at LDHA locus, KDM6B knockdown with LDHA rescue experiments, in vivo lung metastasis model","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq + ChIP-qPCR demonstrating epigenetic regulation at LDHA locus, genetic epistasis rescue; single lab","pmids":["33664867"],"is_preprint":false},{"year":2018,"finding":"HIF1α aberrantly upregulates LDHA in human pluripotent stem cell-derived cardiomyocytes (hPSC-CMs) under standard glucose-containing culture conditions. Chemical or siRNA inhibition of HIF1α or LDHA switches metabolism from aerobic glycolysis to oxidative phosphorylation and improves cardiomyocyte metabolic and functional maturation.","method":"HIF1α siRNA, LDHA small molecule inhibition, Seahorse metabolic flux analysis (OCR/ECAR), mitochondrial content measurement, contractility assessment","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological inhibition with metabolic flux validation, functional contractility readout; single lab with multiple methods","pmids":["30355156"],"is_preprint":false},{"year":2021,"finding":"LDHA knockdown in papillary thyroid carcinoma activated the AMPK pathway and induced protective autophagy. Additionally, the metabolic products of LDHA-catalyzed reactions induced EMT by increasing H3K27 acetylation of relevant EMT genes.","method":"LDHA knockdown (shRNA), AMPK pathway activation assays, autophagy flux measurement, H3K27 acetylation ChIP, EMT marker analysis, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — epigenetic mechanism (H3K27ac ChIP) + AMPK pathway analysis with LDHA KD, in vivo validation; single lab","pmids":["33795650"],"is_preprint":false},{"year":2022,"finding":"METTL3 enhances LDHA expression via two mechanisms: (1) stabilizing HIF-1α mRNA to increase HIF-1α-driven LDHA transcription; and (2) direct m6A methylation of the LDHA mRNA CDS region, promoting its translation through YTHDF1 recruitment.","method":"METTL3 knockdown/overexpression, m6A MeRIP assay, YTHDF1 interaction studies, HIF-1α mRNA stability assay, luciferase reporter, glycolysis measurements, in vivo xenograft","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MeRIP identifying m6A sites, YTHDF1 recruitment assay, two-mechanism validation; single lab","pmids":["35832094"],"is_preprint":false},{"year":2021,"finding":"FOXO4 directly binds to the LDHA promoter and transcriptionally inactivates LDHA expression in a dose-dependent manner in gastric cancer cells, regulating glycolysis. FOXO4 is itself a transcriptional target of HIF-1α, placing FOXO4 between HIF-1α and LDHA in a HIF-1α→FOXO4→LDHA axis.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, FOXO4 overexpression/silencing, glycolysis measurement (glucose uptake, lactate), in vivo 18F-FDG PET in mouse models, patient specimens","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP + luciferase validating promoter binding, in vivo imaging, patient specimen validation; single lab","pmids":["33463054"],"is_preprint":false},{"year":2016,"finding":"Capsaicin directly binds to and inhibits both PKM2 and LDHA, suppressing the Warburg effect in inflammatory macrophages. This was identified using activity-based protein profiling (ABPP) with capsaicin-based chemical probes.","method":"Activity-based protein profiling (ABPP) with designed capsaicin probes, direct binding validation, LDH enzymatic activity assay in macrophages, in vivo endotoxemia/sepsis models","journal":"Cell chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ABPP chemical proteomics identifying direct binding, enzymatic activity assay; single lab","pmids":["35858615"],"is_preprint":false},{"year":2024,"finding":"LDHA mediates lactylation of NLRP3 at lysine 245 (K245), increasing NLRP3 protein stability and promoting cardiomyocyte pyroptosis during myocardial ischemia-reperfusion injury. LDHA knockout attenuated infarct size and myocardial damage, and NLRP3 overexpression counteracted LDHA-knockout protection.","method":"LDHA siRNA knockdown, LDHA knockout in vivo (I/R mouse model), site-specific lactylation assay (K245), NLRP3 protein stability measurement, pyroptosis assays, genetic epistasis (NLRP3 rescue of LDHA KO phenotype)","journal":"BMC cardiovascular disorders","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — specific PTM site identified, genetic epistasis in vivo, multiple mechanistic assays; single lab","pmids":["39548367"],"is_preprint":false},{"year":2022,"finding":"LDHA-mediated histone lactylation (H3K18la) during osteoblast differentiation drives expression of the transcription factor JunB. LDHA knockdown decreases H3K18la enrichment at the JunB promoter; exogenous lactate treatment rescues this effect, suggesting LDHA controls osteogenic differentiation via histone lactylation.","method":"LDHA knockdown, ChIP for H3K18la at JunB promoter, RNA-sequencing, exogenous lactate rescue experiments, ALP activity and mineralized nodule formation assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP demonstrating H3K18la at specific promoter, lactate rescue experiment, RNA-seq; single lab","pmids":["35605402"],"is_preprint":false},{"year":2024,"finding":"LDHA-mediated H3K18 lactylation at the TPI1 promoter enhances TPI1 transcription and promotes glycolysis in chondrocytes in osteoarthritis. Mutation of K69 on H3K18 ameliorated LPS-induced glycolysis. LDHA knockout in vivo recovered cartilage injury.","method":"ChIP for H3K18la at TPI1 promoter, H3K18 K69 site-directed mutagenesis, LDHA knockdown and knockout (in vivo OA model), glycolysis assays, LPS-induced OA cell model","journal":"Autoimmunity","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP at specific locus, mutagenesis, in vivo knockout; single lab","pmids":["39086231"],"is_preprint":false},{"year":2023,"finding":"APOL3 binds LDHA and promotes its ubiquitylation-related degradation in colorectal cancer cells, reducing lactate production and facilitating ferroptosis and CD8+ T cell antitumor activity.","method":"Co-immunoprecipitation (APOL3-LDHA interaction), ubiquitylation assay, APOL3 overexpression/knockdown, ferroptosis assays (MDA, Fe2+), CD8+ T cell co-culture, in vivo tumor model","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP demonstrating binding, ubiquitylation assay, in vivo validation; single lab","pmids":["36923931"],"is_preprint":false},{"year":2021,"finding":"LDHA promotes MMP2/9 expression and extracellular matrix degradation in aortic vascular smooth muscle cells through the LDHA-NDRG3-ERK1/2-MMP2/9 signaling pathway, promoting phenotypic switching from contractile to synthetic phenotype.","method":"LDHA knockdown/overexpression in HAVSMCs, LDHA inhibitor (oxamate) treatment, pathway analysis (NDRG3, p-ERK1/2, MMP2/9 western blotting), in vivo aortic dissection model (BAPN+Ang II)","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pathway dissection with multiple signaling intermediates, in vivo model; single lab","pmids":["34973467"],"is_preprint":false},{"year":2023,"finding":"LDHA deficiency in trophoblasts decreases phosphorylation of PI3K, AKT, and FOXO1, resulting in downregulation of CyclinD1, causing G0/G1 cell cycle arrest and increased apoptosis. RNA sequencing identified PI3K/AKT as a downstream pathway of LDHA in trophoblast biology.","method":"LDHA knockdown/overexpression, RNA-seq, KEGG pathway analysis, phospho-PI3K/AKT/FOXO1 western blotting, AKT inhibitor and FOXO1 inhibitor epistasis, cell cycle analysis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — RNA-seq + pathway validation + pharmacological epistasis; single lab","pmids":["36583693"],"is_preprint":false},{"year":2024,"finding":"LDHA-mediated lactate production in pulmonary artery smooth muscle cells activates Akt signaling, promoting PASMC proliferation and migration and pulmonary vascular remodeling under hypoxia. LDHA knockdown suppressed Akt phosphorylation in vitro and in vivo, and Akt overexpression reversed the inhibitory effect of LDHA knockdown.","method":"LDHA knockdown (shRNA) in PASMCs, Akt overexpression rescue, phospho-Akt western blotting, in vivo hypoxic mouse PH model (Sugen/hypoxia, MCT-induced rat), LDHA inhibitor treatment, CCK8/EdU proliferation assays","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — genetic epistasis (Akt rescue), multiple in vivo PH models, signaling pathway analysis; single lab","pmids":["39103838"],"is_preprint":false},{"year":2024,"finding":"BH4 (tetrahydrobiopterin) controls S-nitrosylation of LDHA at Cys163 and Cys293 via NO. S-nitrosylation at these sites restricts LDHA-mediated ROS generation. Loss of S-nitrosylation after irradiation increases LDHA-driven ROS and radiosensitivity.","method":"iodoTMT-based quantitative mass spectrometry identifying S-nitrosylation sites, GCH1 knockout/knockin conditional lung mice, BH4 supplementation, NO pathway manipulation, ROS measurements","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mass spectrometry-identified PTM sites on LDHA, conditional genetic mouse models; specific sites identified but full functional mutagenesis not detailed in abstract","pmids":["38689083"],"is_preprint":false},{"year":2024,"finding":"SIRT2 deacetylates LDHA; inhibition of NAD+ synthesis (via FK866) enhances acetylation of LDHA in 293T cells, as shown by Co-IP. The Nampt/SIRT2/LDHA pathway mediates lactate production in granulosa cells relevant to follicular development.","method":"Co-immunoprecipitation (acetylated LDHA detection), FK866 inhibitor treatment, SIRT2 knockdown, NMN supplementation in PCOS rat model, lactate and glycolysis measurements","journal":"Free radical biology & medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP for acetylation, no direct deacetylase activity assay; limited mechanistic validation in the abstract","pmids":["39489197"],"is_preprint":false},{"year":2015,"finding":"FOXM1 transcriptionally activates LDHA expression in gastric cancer by binding to the LDHA promoter, regulating the glycolytic phenotype, proliferation, migration, and invasion via LDHA.","method":"FOXM1 knockdown/overexpression, glycolytic enzyme expression profiling, LDHA promoter analysis, LDH activity and lactate measurement","journal":"International journal of clinical and experimental pathology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — promoter analysis stated but ChIP not explicitly described in abstract; functionally validated but limited mechanistic detail","pmids":["26261559"],"is_preprint":false},{"year":2023,"finding":"SIX1 transcription factor directly binds to the LDHA promoter region (confirmed by ChIP assay) and activates LDHA expression, promoting lactate accumulation and NK cell dysfunction in pancreatic cancer.","method":"Chromatin immunoprecipitation (ChIP), SIX1 overexpression, LDHA inhibitor treatment, NK cell co-culture functional assays, in vivo tumor model","journal":"Journal of immunology research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP confirming direct promoter binding, NK cell functional epistasis; single lab","pmids":["36937004"],"is_preprint":false},{"year":2022,"finding":"USP1 deubiquitinase interacts with and deubiquitinates PLK1, and elevated PLK1 increases LDHA expression. Inhibition of PLK1 reduces LDHA expression and abrogates USP1-mediated glycolysis; LDHA overexpression rescues USP1-silencing-induced growth suppression, placing LDHA downstream of the USP1-PLK1 axis in T-ALL.","method":"Co-immunoprecipitation (USP1-PLK1), deubiquitination assay, PLK1 inhibition, LDHA rescue overexpression, proliferation and glycolysis assays, in vivo leukemia mouse model","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP + deubiquitination assay + genetic epistasis rescue experiment; single lab","pmids":["36912760"],"is_preprint":false},{"year":2024,"finding":"KCNK1 binds to and activates LDHA, increasing glycolysis and lactate production in breast cancer cells. Elevated lactate then promotes histone lysine lactylation (H3K18la), driving expression of downstream genes including LDHA itself in a positive feedback loop. Increased LDHA activity also reduces tumor cell stiffness and adhesion.","method":"Co-immunoprecipitation (KCNK1-LDHA binding), LDHA activity measurement, H3K18 lactylation western blotting, KCNK1 knockdown/overexpression, in vivo breast cancer model","journal":"PLoS biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP demonstrating direct binding, activity assay, histone lactylation measurement; single lab","pmids":["38905316"],"is_preprint":false},{"year":2021,"finding":"NAC1 transcription factor positively regulates LDHA expression at the transcriptional level in melanoma cells, leading to higher lactate accumulation in the tumor microenvironment that inhibits cytokine production and induces exhaustion/apoptosis of CD8+ cytotoxic T lymphocytes, impairing antitumor immunity.","method":"CRISPR/Cas9 NAC1 depletion, LDHA expression measurement, lactic acid measurement in TME, adoptive CTL transfer in immunocompetent/immunodeficient mouse melanoma models, CTL function assays, retroviral transduction","journal":"Journal for immunotherapy of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO, adoptive transfer epistasis, CTL functional assays, in vivo mouse model; transcriptional mechanism asserted but ChIP not explicitly stated in abstract","pmids":["36150745"],"is_preprint":false},{"year":2017,"finding":"LDHA inhibition (via oxamate or siRNA) impairs TNF-α-dependent tumor cell migration and reduces TNF-α-induced MMP9 expression in esophageal cancer cells. These effects are associated with disruption of ERK1/2 signaling pathway activation. Lactic acid synergizes with TNF-α to stimulate MMP9 expression.","method":"siRNA-mediated LDHA knockdown, sodium oxamate (LDHA inhibitor), wound healing assay, gelatin zymography (MMP9 activity), ERK1/2 phosphorylation western blotting, lactate measurement","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pharmacological and genetic LDHA inhibition, signaling pathway (ERK1/2) measurement, multiple functional assays; single lab","pmids":["36555705"],"is_preprint":false}],"current_model":"LDHA is established as the key glycolytic enzyme catalyzing pyruvate-to-lactate conversion using NADH; its activity is regulated by multiple PTMs (phosphorylation at Y10 by HER2/Src/FGFR1, palmitoylation at C163 by ZDHHC9, succinylation at K155 inhibited by SIRT5/promoted by lncRNA GLTC, and S-nitrosylation at C163/C293 by BH4/NO), and its transcription is activated by HIF-1/2α, FOXM1, c-Myc, JMJD2A, SIX1, YY1, and FOXQ1, and repressed by KLF4, FOXO4, and miR-34a/miR-142-3p among others; beyond glycolysis, LDHA exerts noncanonical functions including activating Rac1 GTPase (by sequestering Rac1-GTP from GAPs), binding eEF2 in an NADH-dependent manner to control mRNA translation in megakaryocytes, producing lactate that drives histone lactylation (H3K18la) of downstream gene promoters, promoting NLRP3 lactylation to induce pyroptosis, and contributing to ROS generation and NF-κB/IκB-ζ signaling in chondrocytes."},"narrative":{"mechanistic_narrative":"LDHA is the glycolytic enzyme catalyzing NADH-dependent conversion of pyruvate to lactate, and its expression and activity are tuned by an extensive regulatory network that drives aerobic glycolysis (the Warburg effect) in cancer and in tissue remodeling [PMID:24634381, PMID:28193910]. Transcriptionally, LDHA is activated by hypoxia-responsive HIF-1α/HIF-2α binding an upstream HRE [PMID:28193910], by FOXM1 [PMID:24634381], by histone-demethylase–driven chromatin remodeling at its locus (JMJD2A, KDM6B) [PMID:28693517, PMID:33664867], and by c-Myc–containing complexes recruited with MTA1 or NUSAP1/HIF-1α [PMID:31570164, PMID:37354982], while it is directly repressed by KLF4 and by FOXO4 acting downstream of HIF-1α [PMID:24947925, PMID:33463054]. Post-transcriptionally, METTL3-deposited m6A on the LDHA CDS promotes its translation via YTHDF1 [PMID:35832094]. Enzymatic output is further controlled by post-translational modifications: tyrosine-10 phosphorylation by HER2/Src and FGFR1 activates LDHA and is scaffolded by FKBP10 and circVAMP3 [PMID:28218905, PMID:38233415, PMID:35525866]; K155 succinylation, set by competition between SIRT5 and the lncRNA GLTC, raises activity [PMID:37031273]; ZDHHC9-mediated C163 palmitoylation increases activity and lowers ROS [PMID:38331089]; and BH4/NO-dependent S-nitrosylation at C163/C293 restrains LDHA-driven ROS [PMID:38689083]. Beyond catalysis, LDHA performs noncanonical, lactate-independent functions: it binds active Rac1-GTP to shield it from GAPs and sustain Rac1 signaling [PMID:36536137], and it sequesters eEF2 in an NADH-dependent manner to control mRNA translation during megakaryocyte maturation [PMID:35176139]. The lactate it produces acts as a signaling and epigenetic substrate, driving H3K18 histone lactylation at target promoters (JunB, TPI1) and lactylation of NLRP3 and NUSAP1 [PMID:35605402, PMID:39086231, PMID:39548367, PMID:37354982], and accumulating in the tumor microenvironment to suppress NFAT-dependent IFN-γ production and impair T/NK and CD8+ cytotoxic responses [PMID:27641098, PMID:36150745]. Through these activities LDHA promotes cancer growth, invasion, and immune evasion and contributes to cardiomyocyte proliferation, vascular smooth-muscle remodeling, inflammatory chondrocyte catabolism, and trophoblast proliferation [PMID:32647171, PMID:36057161, PMID:34973467, PMID:36583693].","teleology":[{"year":2014,"claim":"Established that LDHA expression is set by opposing transcription factors at its promoter, defining a bidirectional control point for aerobic glycolysis in tumors.","evidence":"ChIP and luciferase reporter assays with FOXM1 (activating) and KLF4 (repressing) in pancreatic cancer, with in vivo models","pmids":["24634381","24947925"],"confidence":"High","gaps":["Did not resolve how activating and repressing inputs are integrated at the locus","Restricted to pancreatic cancer context"]},{"year":2016,"claim":"Showed that LDHA-derived lactate is not merely metabolic waste but an immunosuppressive signal, linking tumor glycolysis to immune evasion.","evidence":"Ldha-low tumor cells across immunocompetent, Rag2−/−γc−/−, and Ifng−/− mice with NFAT/IFN-γ readouts","pmids":["27641098"],"confidence":"High","gaps":["Did not define the lactate sensor in T/NK cells","Mechanism of NFAT suppression by lactate not detailed"]},{"year":2017,"claim":"Identified hypoxic transcriptional induction (HIF-1α/HIF-2α) and activating Y10 phosphorylation (HER2/Src) as parallel routes that boost LDHA activity and promote metastasis via redox control.","evidence":"ChIP/luciferase for HIF binding; Y10F mutagenesis, kinase inhibitors, ROS/anoikis assays and xenograft metastasis models","pmids":["28193910","28218905"],"confidence":"High","gaps":["Did not establish structural basis of Y10 phosphorylation on activity","Interplay between transcriptional and PTM control not addressed"]},{"year":2021,"claim":"Extended LDHA regulation to chromatin and signaling axes, showing histone-demethylase control at the locus and lactate-driven downstream signaling 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by upstream kinases HER2 and Src; this phosphorylation activates LDHA enzymatic activity and promotes cancer cell invasion, anoikis resistance, and tumor metastasis through redox homeostasis (ROS regulation). Expression of phospho-deficient LDHA Y10F sensitized cells to anoikis and elevated ROS, while lactate or antioxidant NAC reversed these phenotypes.\",\n      \"method\": \"Site-directed mutagenesis (Y10F), kinase inhibitor treatment, shRNA knockdown, in vitro LDH activity assay, xenograft metastasis model, patient sample correlation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of active site residue, multiple orthogonal methods (activity assay, rescue experiments, in vivo model, clinical samples), single lab but rigorous\",\n      \"pmids\": [\"28218905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LDHA interacts with active Rac1 (Rac1-GTP) to inhibit its interaction with GTPase-activating proteins (GAPs), thereby sustaining Rac1 activation independently of LDHA's glycolytic enzyme activity. This noncanonical oncogenic mechanism promotes cancer cell growth, and combination inhibition of LDHA enzyme activity plus Rac1 shows synergistic anti-tumor effects in breast cancer.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, Rac1-GTP activity assays, glycolytic-activity-dead LDHA mutants, in vivo breast cancer models, clinical sample analysis\",\n      \"journal\": \"Nature metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, activity-dead mutants, in vivo and clinical validation, multiple orthogonal methods\",\n      \"pmids\": [\"36536137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Under inflammatory conditions, NF-κB activation in chondrocytes promotes metabolic reprogramming toward LDHA. LDHA binds NADH and promotes reactive oxygen species (ROS) generation, which stabilizes IκB-ζ, a pro-inflammatory mediator, inducing catabolic changes in chondrocytes relevant to osteoarthritis pathogenesis.\",\n      \"method\": \"NF-κB pathway modulation, LDHA knockdown/overexpression, ROS measurement, IκB-ζ protein stability assays, in vivo OA models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (binding assay, ROS measurement, pathway modulation, in vivo model), published in high-impact journal\",\n      \"pmids\": [\"32647171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LDHA interacts with eukaryotic elongation factor 2 (eEF2) in the cytoplasm in an NADH-dependent manner, sequestering eEF2 from ribosomes and thereby controlling translation. LDHA knockout in megakaryocytes releases eEF2 to participate in translation, accelerating megakaryocyte maturation and platelet production. This function is independent of LDHA's lactate-producing activity.\",\n      \"method\": \"Co-immunoprecipitation, MK/platelet-specific Ldha knockout mice, in vitro translation assays, NADH-competitive LDHA inhibitors, platelet count measurements, human cord blood MK differentiation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP demonstrating direct interaction, genetic knockout, NADH-dependence mechanistic dissection, multiple orthogonal approaches\",\n      \"pmids\": [\"35176139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The lncRNA GLTC binds LDHA and competitively inhibits the interaction between SIRT5 (a desuccinylase) and LDHA, thereby promoting succinylation of LDHA at lysine 155 (K155). K155 succinylation increases LDHA enzymatic activity and aerobic glycolysis; expression of a succinylation-mimetic LDHAK155E mutant rescues glycolysis in GLTC-depleted cells.\",\n      \"method\": \"Mass spectrometry identification of succinylation site, Co-immunoprecipitation, SIRT5 competition assay, site-directed mutagenesis (K155E succinylation mimetic), in vitro enzymatic activity assay, in vivo xenograft model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mass spectrometry PTM identification, mutagenesis, Co-IP competition assay, activity assay, in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"37031273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LDHA is palmitoylated by the palmitoyltransferase ZDHHC9 at cysteine 163. This palmitoylation promotes LDHA enzymatic activity, increases lactate production, and reduces ROS generation. A palmitoylation-deficient LDHA mutant (C163A) reduces pancreatic cancer cell proliferation and tumor growth, and LDHA palmitoylation is upregulated in gemcitabine-resistant cells.\",\n      \"method\": \"Palmitoylation site mapping, ZDHHC9 knockdown/overexpression, palmitoylation-deficient mutant (C163A), in vitro LDHA activity assay, ROS measurement, xenograft tumor model\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — PTM writer identified (ZDHHC9), specific site mapped (C163), mutagenesis, enzymatic activity assay, in vivo validation\",\n      \"pmids\": [\"38331089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Transcription factor FOXM1 directly binds to the LDHA promoter and transcriptionally activates LDHA gene expression, thereby upregulating LDH enzymatic activity, lactate production, and glucose utilization in pancreatic cancer cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) assay, luciferase reporter assay, FOXM1 overexpression/knockdown, LDH activity measurement, in vivo pancreatic cancer models\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ChIP demonstrating promoter binding, luciferase reporter validation, in vivo animal model, multiple orthogonal methods\",\n      \"pmids\": [\"24634381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Transcription factor KLF4 directly binds to the LDHA gene promoter and negatively regulates its transcription, suppressing LDHA expression and aerobic glycolysis in pancreatic cancer cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) assay, KLF4 overexpression/knockdown, LDHA promoter reporter assay, glycolysis measurements (glucose consumption, lactate production), orthotopic mouse model\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ChIP demonstrating promoter binding, multiple cell biology assays, in vivo orthotopic model\",\n      \"pmids\": [\"24947925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HIF-1α and HIF-2α bind to the LDHA promoter at an HRE site 89 bp upstream under hypoxic conditions, directly activating LDHA transcription in pancreatic cancer cells. Knockdown of HIF-1α and HIF-2α decreases LDHA expression, lactate production, and glucose utilization even under hypoxia.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) assay, luciferase reporter assay, HIF-1α/HIF-2α siRNA knockdown, lactate and glucose measurements, immunofluorescence in patient specimens\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ChIP + luciferase confirming promoter binding, genetic validation, patient sample confirmation\",\n      \"pmids\": [\"28193910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FKBP10 binds directly to LDHA through its C-terminal region and enhances LDHA phosphorylation at tyrosine 10 (Y10), resulting in hyperactive Warburg effect and accumulation of histone lactylation in clear cell renal cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping experiments, phospho-LDHA Y10 western blotting, FKBP10 knockdown/overexpression, in vivo xenograft models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, phosphorylation assay, in vivo validation; single lab\",\n      \"pmids\": [\"38233415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The circular RNA circVAMP3 directly interacts with LDHA and facilitates LDHA phosphorylation at tyrosine 10 (Y10) by the upstream kinase FGFR1, thereby increasing LDHA enzymatic activity and promoting aerobic glycolysis and proliferation in renal cell carcinoma.\",\n      \"method\": \"RNA pulldown assay, Co-immunoprecipitation, LDHA Y10 phosphorylation assay, FGFR1 inhibitor treatment, circVAMP3 knockdown/overexpression, glycolysis measurements\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — RNA pulldown + Co-IP identifying direct interaction, Y10 phosphorylation assay, FGFR1 epistasis; single lab\",\n      \"pmids\": [\"35525866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PGC1β transcriptionally upregulates LDHA expression through the PGC1β/RXRβ axis acting on the LDHA promoter, promoting glycolytic metabolism and tumor growth in multiple myeloma.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay with LDHA deletion constructs, siRNA knockdown, stable overexpression cell lines, in vivo xenograft model\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP + luciferase reporter with deletion constructs, in vivo validation; single lab\",\n      \"pmids\": [\"30051603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LDHA-associated lactic acid accumulation in tumors inhibits the function and survival of T and NK cells by preventing upregulation of NFAT, resulting in diminished IFN-γ production. This mechanism was established using Ldha-low tumor cells in immunocompetent vs. immunodeficient (Rag2−/−γc−/−) and Ifng−/− mice.\",\n      \"method\": \"Ldha knockdown tumor cells, immunocompetent and immunodeficient mouse models, genetic epistasis (Rag2−/−γc−/−, Ifng−/− mice), NFAT activity measurement, IFN-γ production assays, pathophysiological lactic acid treatment of T/NK cells\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using multiple mouse models, NFAT signaling mechanistic dissection, in vivo + in vitro orthogonal methods\",\n      \"pmids\": [\"27641098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LDHA-mediated metabolic reprogramming promotes cardiomyocyte (CM) proliferation by: (1) inhibiting succinylation-dependent ubiquitination of thioredoxin reductase 1 (Txnrd1) via succinyl-CoA reduction, thus alleviating ROS; and (2) driving lactate production that induces M2 macrophage polarization. CM-specific LDHA knockout inhibited CM proliferation; CM-specific overexpression promoted cardiac repair post-MI.\",\n      \"method\": \"CRISPR/Cas9 CM-specific knockout mice, CM-specific overexpression, metabolomics, proteomics, Co-immunoprecipitation (Txnrd1 interaction), flow cytometry for macrophage polarization, cardiac function measurements\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying Txnrd1 interaction, genetic KO/OE mouse models, metabolomics; single lab with multiple methods\",\n      \"pmids\": [\"36057161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"JMJD2A (a histone demethylase) binds to the LDHA promoter region and transcriptionally activates LDHA expression in nasopharyngeal carcinoma, promoting the Warburg effect. JMJD2A alteration selectively affects LDHA among glycolytic enzymes.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) assay, JMJD2A knockdown/overexpression, glycolysis measurements (ATP, lactate production, glucose utilization), IHC in patient specimens\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct promoter binding, functional glycolysis assays; single lab\",\n      \"pmids\": [\"28693517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MTA1 (metastasis-associated protein 1) interacts with c-Myc and the MTA1-c-Myc complex is recruited to the LDHA promoter to regulate LDHA transcription in breast cancer, thereby controlling LDHA expression and subsequent cell migration.\",\n      \"method\": \"Co-immunoprecipitation (MTA1-c-Myc interaction), ChIP assay (promoter occupancy), LDHA siRNA knockdown in MTA1-overexpressing MCF7 cells, migration assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP + ChIP, functional rescue; single lab\",\n      \"pmids\": [\"31570164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NUSAP1 binds to both c-Myc and HIF-1α to form a transcription regulatory complex that localizes to the LDHA promoter and enhances LDHA expression. In a feedforward loop, LDHA-produced lactate upregulates NUSAP1 by inhibiting its protein degradation through lysine lactylation (Kla) modification.\",\n      \"method\": \"ChIP-seq and CHIP-qPCR (complex localization to LDHA promoter), Co-IP (NUSAP1-c-Myc-HIF-1α complex), mass spectrometry (lactylation modification), RNA-seq, xenograft/spontaneous PDAC models\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq + Co-IP + mass spectrometry PTM identification, in vivo validation; single lab\",\n      \"pmids\": [\"37354982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KDM6B histone demethylase directly mediates H3K27me3 demethylation at the LDHA locus, thereby increasing LDHA expression in osteosarcoma and promoting tumor metastasis. Overexpression of LDHA reversed the metastasis inhibition observed upon KDM6B knockdown.\",\n      \"method\": \"ChIP-seq + RNA-seq analysis identifying LDHA as KDM6B target, ChIP-qPCR validating H3K27me3 changes at LDHA locus, KDM6B knockdown with LDHA rescue experiments, in vivo lung metastasis model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq + ChIP-qPCR demonstrating epigenetic regulation at LDHA locus, genetic epistasis rescue; single lab\",\n      \"pmids\": [\"33664867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HIF1α aberrantly upregulates LDHA in human pluripotent stem cell-derived cardiomyocytes (hPSC-CMs) under standard glucose-containing culture conditions. Chemical or siRNA inhibition of HIF1α or LDHA switches metabolism from aerobic glycolysis to oxidative phosphorylation and improves cardiomyocyte metabolic and functional maturation.\",\n      \"method\": \"HIF1α siRNA, LDHA small molecule inhibition, Seahorse metabolic flux analysis (OCR/ECAR), mitochondrial content measurement, contractility assessment\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological inhibition with metabolic flux validation, functional contractility readout; single lab with multiple methods\",\n      \"pmids\": [\"30355156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LDHA knockdown in papillary thyroid carcinoma activated the AMPK pathway and induced protective autophagy. Additionally, the metabolic products of LDHA-catalyzed reactions induced EMT by increasing H3K27 acetylation of relevant EMT genes.\",\n      \"method\": \"LDHA knockdown (shRNA), AMPK pathway activation assays, autophagy flux measurement, H3K27 acetylation ChIP, EMT marker analysis, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — epigenetic mechanism (H3K27ac ChIP) + AMPK pathway analysis with LDHA KD, in vivo validation; single lab\",\n      \"pmids\": [\"33795650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 enhances LDHA expression via two mechanisms: (1) stabilizing HIF-1α mRNA to increase HIF-1α-driven LDHA transcription; and (2) direct m6A methylation of the LDHA mRNA CDS region, promoting its translation through YTHDF1 recruitment.\",\n      \"method\": \"METTL3 knockdown/overexpression, m6A MeRIP assay, YTHDF1 interaction studies, HIF-1α mRNA stability assay, luciferase reporter, glycolysis measurements, in vivo xenograft\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MeRIP identifying m6A sites, YTHDF1 recruitment assay, two-mechanism validation; single lab\",\n      \"pmids\": [\"35832094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FOXO4 directly binds to the LDHA promoter and transcriptionally inactivates LDHA expression in a dose-dependent manner in gastric cancer cells, regulating glycolysis. FOXO4 is itself a transcriptional target of HIF-1α, placing FOXO4 between HIF-1α and LDHA in a HIF-1α→FOXO4→LDHA axis.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, FOXO4 overexpression/silencing, glycolysis measurement (glucose uptake, lactate), in vivo 18F-FDG PET in mouse models, patient specimens\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP + luciferase validating promoter binding, in vivo imaging, patient specimen validation; single lab\",\n      \"pmids\": [\"33463054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Capsaicin directly binds to and inhibits both PKM2 and LDHA, suppressing the Warburg effect in inflammatory macrophages. This was identified using activity-based protein profiling (ABPP) with capsaicin-based chemical probes.\",\n      \"method\": \"Activity-based protein profiling (ABPP) with designed capsaicin probes, direct binding validation, LDH enzymatic activity assay in macrophages, in vivo endotoxemia/sepsis models\",\n      \"journal\": \"Cell chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ABPP chemical proteomics identifying direct binding, enzymatic activity assay; single lab\",\n      \"pmids\": [\"35858615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LDHA mediates lactylation of NLRP3 at lysine 245 (K245), increasing NLRP3 protein stability and promoting cardiomyocyte pyroptosis during myocardial ischemia-reperfusion injury. LDHA knockout attenuated infarct size and myocardial damage, and NLRP3 overexpression counteracted LDHA-knockout protection.\",\n      \"method\": \"LDHA siRNA knockdown, LDHA knockout in vivo (I/R mouse model), site-specific lactylation assay (K245), NLRP3 protein stability measurement, pyroptosis assays, genetic epistasis (NLRP3 rescue of LDHA KO phenotype)\",\n      \"journal\": \"BMC cardiovascular disorders\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — specific PTM site identified, genetic epistasis in vivo, multiple mechanistic assays; single lab\",\n      \"pmids\": [\"39548367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LDHA-mediated histone lactylation (H3K18la) during osteoblast differentiation drives expression of the transcription factor JunB. LDHA knockdown decreases H3K18la enrichment at the JunB promoter; exogenous lactate treatment rescues this effect, suggesting LDHA controls osteogenic differentiation via histone lactylation.\",\n      \"method\": \"LDHA knockdown, ChIP for H3K18la at JunB promoter, RNA-sequencing, exogenous lactate rescue experiments, ALP activity and mineralized nodule formation assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP demonstrating H3K18la at specific promoter, lactate rescue experiment, RNA-seq; single lab\",\n      \"pmids\": [\"35605402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LDHA-mediated H3K18 lactylation at the TPI1 promoter enhances TPI1 transcription and promotes glycolysis in chondrocytes in osteoarthritis. Mutation of K69 on H3K18 ameliorated LPS-induced glycolysis. LDHA knockout in vivo recovered cartilage injury.\",\n      \"method\": \"ChIP for H3K18la at TPI1 promoter, H3K18 K69 site-directed mutagenesis, LDHA knockdown and knockout (in vivo OA model), glycolysis assays, LPS-induced OA cell model\",\n      \"journal\": \"Autoimmunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP at specific locus, mutagenesis, in vivo knockout; single lab\",\n      \"pmids\": [\"39086231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"APOL3 binds LDHA and promotes its ubiquitylation-related degradation in colorectal cancer cells, reducing lactate production and facilitating ferroptosis and CD8+ T cell antitumor activity.\",\n      \"method\": \"Co-immunoprecipitation (APOL3-LDHA interaction), ubiquitylation assay, APOL3 overexpression/knockdown, ferroptosis assays (MDA, Fe2+), CD8+ T cell co-culture, in vivo tumor model\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP demonstrating binding, ubiquitylation assay, in vivo validation; single lab\",\n      \"pmids\": [\"36923931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LDHA promotes MMP2/9 expression and extracellular matrix degradation in aortic vascular smooth muscle cells through the LDHA-NDRG3-ERK1/2-MMP2/9 signaling pathway, promoting phenotypic switching from contractile to synthetic phenotype.\",\n      \"method\": \"LDHA knockdown/overexpression in HAVSMCs, LDHA inhibitor (oxamate) treatment, pathway analysis (NDRG3, p-ERK1/2, MMP2/9 western blotting), in vivo aortic dissection model (BAPN+Ang II)\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pathway dissection with multiple signaling intermediates, in vivo model; single lab\",\n      \"pmids\": [\"34973467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LDHA deficiency in trophoblasts decreases phosphorylation of PI3K, AKT, and FOXO1, resulting in downregulation of CyclinD1, causing G0/G1 cell cycle arrest and increased apoptosis. RNA sequencing identified PI3K/AKT as a downstream pathway of LDHA in trophoblast biology.\",\n      \"method\": \"LDHA knockdown/overexpression, RNA-seq, KEGG pathway analysis, phospho-PI3K/AKT/FOXO1 western blotting, AKT inhibitor and FOXO1 inhibitor epistasis, cell cycle analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — RNA-seq + pathway validation + pharmacological epistasis; single lab\",\n      \"pmids\": [\"36583693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LDHA-mediated lactate production in pulmonary artery smooth muscle cells activates Akt signaling, promoting PASMC proliferation and migration and pulmonary vascular remodeling under hypoxia. LDHA knockdown suppressed Akt phosphorylation in vitro and in vivo, and Akt overexpression reversed the inhibitory effect of LDHA knockdown.\",\n      \"method\": \"LDHA knockdown (shRNA) in PASMCs, Akt overexpression rescue, phospho-Akt western blotting, in vivo hypoxic mouse PH model (Sugen/hypoxia, MCT-induced rat), LDHA inhibitor treatment, CCK8/EdU proliferation assays\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — genetic epistasis (Akt rescue), multiple in vivo PH models, signaling pathway analysis; single lab\",\n      \"pmids\": [\"39103838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BH4 (tetrahydrobiopterin) controls S-nitrosylation of LDHA at Cys163 and Cys293 via NO. S-nitrosylation at these sites restricts LDHA-mediated ROS generation. Loss of S-nitrosylation after irradiation increases LDHA-driven ROS and radiosensitivity.\",\n      \"method\": \"iodoTMT-based quantitative mass spectrometry identifying S-nitrosylation sites, GCH1 knockout/knockin conditional lung mice, BH4 supplementation, NO pathway manipulation, ROS measurements\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mass spectrometry-identified PTM sites on LDHA, conditional genetic mouse models; specific sites identified but full functional mutagenesis not detailed in abstract\",\n      \"pmids\": [\"38689083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SIRT2 deacetylates LDHA; inhibition of NAD+ synthesis (via FK866) enhances acetylation of LDHA in 293T cells, as shown by Co-IP. The Nampt/SIRT2/LDHA pathway mediates lactate production in granulosa cells relevant to follicular development.\",\n      \"method\": \"Co-immunoprecipitation (acetylated LDHA detection), FK866 inhibitor treatment, SIRT2 knockdown, NMN supplementation in PCOS rat model, lactate and glycolysis measurements\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP for acetylation, no direct deacetylase activity assay; limited mechanistic validation in the abstract\",\n      \"pmids\": [\"39489197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FOXM1 transcriptionally activates LDHA expression in gastric cancer by binding to the LDHA promoter, regulating the glycolytic phenotype, proliferation, migration, and invasion via LDHA.\",\n      \"method\": \"FOXM1 knockdown/overexpression, glycolytic enzyme expression profiling, LDHA promoter analysis, LDH activity and lactate measurement\",\n      \"journal\": \"International journal of clinical and experimental pathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — promoter analysis stated but ChIP not explicitly described in abstract; functionally validated but limited mechanistic detail\",\n      \"pmids\": [\"26261559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SIX1 transcription factor directly binds to the LDHA promoter region (confirmed by ChIP assay) and activates LDHA expression, promoting lactate accumulation and NK cell dysfunction in pancreatic cancer.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), SIX1 overexpression, LDHA inhibitor treatment, NK cell co-culture functional assays, in vivo tumor model\",\n      \"journal\": \"Journal of immunology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP confirming direct promoter binding, NK cell functional epistasis; single lab\",\n      \"pmids\": [\"36937004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"USP1 deubiquitinase interacts with and deubiquitinates PLK1, and elevated PLK1 increases LDHA expression. Inhibition of PLK1 reduces LDHA expression and abrogates USP1-mediated glycolysis; LDHA overexpression rescues USP1-silencing-induced growth suppression, placing LDHA downstream of the USP1-PLK1 axis in T-ALL.\",\n      \"method\": \"Co-immunoprecipitation (USP1-PLK1), deubiquitination assay, PLK1 inhibition, LDHA rescue overexpression, proliferation and glycolysis assays, in vivo leukemia mouse model\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP + deubiquitination assay + genetic epistasis rescue experiment; single lab\",\n      \"pmids\": [\"36912760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KCNK1 binds to and activates LDHA, increasing glycolysis and lactate production in breast cancer cells. Elevated lactate then promotes histone lysine lactylation (H3K18la), driving expression of downstream genes including LDHA itself in a positive feedback loop. Increased LDHA activity also reduces tumor cell stiffness and adhesion.\",\n      \"method\": \"Co-immunoprecipitation (KCNK1-LDHA binding), LDHA activity measurement, H3K18 lactylation western blotting, KCNK1 knockdown/overexpression, in vivo breast cancer model\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP demonstrating direct binding, activity assay, histone lactylation measurement; single lab\",\n      \"pmids\": [\"38905316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NAC1 transcription factor positively regulates LDHA expression at the transcriptional level in melanoma cells, leading to higher lactate accumulation in the tumor microenvironment that inhibits cytokine production and induces exhaustion/apoptosis of CD8+ cytotoxic T lymphocytes, impairing antitumor immunity.\",\n      \"method\": \"CRISPR/Cas9 NAC1 depletion, LDHA expression measurement, lactic acid measurement in TME, adoptive CTL transfer in immunocompetent/immunodeficient mouse melanoma models, CTL function assays, retroviral transduction\",\n      \"journal\": \"Journal for immunotherapy of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO, adoptive transfer epistasis, CTL functional assays, in vivo mouse model; transcriptional mechanism asserted but ChIP not explicitly stated in abstract\",\n      \"pmids\": [\"36150745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LDHA inhibition (via oxamate or siRNA) impairs TNF-α-dependent tumor cell migration and reduces TNF-α-induced MMP9 expression in esophageal cancer cells. These effects are associated with disruption of ERK1/2 signaling pathway activation. Lactic acid synergizes with TNF-α to stimulate MMP9 expression.\",\n      \"method\": \"siRNA-mediated LDHA knockdown, sodium oxamate (LDHA inhibitor), wound healing assay, gelatin zymography (MMP9 activity), ERK1/2 phosphorylation western blotting, lactate measurement\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pharmacological and genetic LDHA inhibition, signaling pathway (ERK1/2) measurement, multiple functional assays; single lab\",\n      \"pmids\": [\"36555705\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LDHA is established as the key glycolytic enzyme catalyzing pyruvate-to-lactate conversion using NADH; its activity is regulated by multiple PTMs (phosphorylation at Y10 by HER2/Src/FGFR1, palmitoylation at C163 by ZDHHC9, succinylation at K155 inhibited by SIRT5/promoted by lncRNA GLTC, and S-nitrosylation at C163/C293 by BH4/NO), and its transcription is activated by HIF-1/2α, FOXM1, c-Myc, JMJD2A, SIX1, YY1, and FOXQ1, and repressed by KLF4, FOXO4, and miR-34a/miR-142-3p among others; beyond glycolysis, LDHA exerts noncanonical functions including activating Rac1 GTPase (by sequestering Rac1-GTP from GAPs), binding eEF2 in an NADH-dependent manner to control mRNA translation in megakaryocytes, producing lactate that drives histone lactylation (H3K18la) of downstream gene promoters, promoting NLRP3 lactylation to induce pyroptosis, and contributing to ROS generation and NF-κB/IκB-ζ signaling in chondrocytes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LDHA is the glycolytic enzyme catalyzing NADH-dependent conversion of pyruvate to lactate, and its expression and activity are tuned by an extensive regulatory network that drives aerobic glycolysis (the Warburg effect) in cancer and in tissue remodeling [#6, #8]. Transcriptionally, LDHA is activated by hypoxia-responsive HIF-1\\u03b1/HIF-2\\u03b1 binding an upstream HRE [#8], by FOXM1 [#6], by histone-demethylase\\u2013driven chromatin remodeling at its locus (JMJD2A, KDM6B) [#14, #17], and by c-Myc\\u2013containing complexes recruited with MTA1 or NUSAP1/HIF-1\\u03b1 [#15, #16], while it is directly repressed by KLF4 and by FOXO4 acting downstream of HIF-1\\u03b1 [#7, #21]. Post-transcriptionally, METTL3-deposited m6A on the LDHA CDS promotes its translation via YTHDF1 [#20]. Enzymatic output is further controlled by post-translational modifications: tyrosine-10 phosphorylation by HER2/Src and FGFR1 activates LDHA and is scaffolded by FKBP10 and circVAMP3 [#0, #9, #10]; K155 succinylation, set by competition between SIRT5 and the lncRNA GLTC, raises activity [#4]; ZDHHC9-mediated C163 palmitoylation increases activity and lowers ROS [#5]; and BH4/NO-dependent S-nitrosylation at C163/C293 restrains LDHA-driven ROS [#30]. Beyond catalysis, LDHA performs noncanonical, lactate-independent functions: it binds active Rac1-GTP to shield it from GAPs and sustain Rac1 signaling [#1], and it sequesters eEF2 in an NADH-dependent manner to control mRNA translation during megakaryocyte maturation [#3]. The lactate it produces acts as a signaling and epigenetic substrate, driving H3K18 histone lactylation at target promoters (JunB, TPI1) and lactylation of NLRP3 and NUSAP1 [#24, #25, #23, #16], and accumulating in the tumor microenvironment to suppress NFAT-dependent IFN-\\u03b3 production and impair T/NK and CD8+ cytotoxic responses [#12, #36]. Through these activities LDHA promotes cancer growth, invasion, and immune evasion and contributes to cardiomyocyte proliferation, vascular smooth-muscle remodeling, inflammatory chondrocyte catabolism, and trophoblast proliferation [#2, #13, #27, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that LDHA expression is set by opposing transcription factors at its promoter, defining a bidirectional control point for aerobic glycolysis in tumors.\",\n      \"evidence\": \"ChIP and luciferase reporter assays with FOXM1 (activating) and KLF4 (repressing) in pancreatic cancer, with in vivo models\",\n      \"pmids\": [\"24634381\", \"24947925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how activating and repressing inputs are integrated at the locus\", \"Restricted to pancreatic cancer context\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed that LDHA-derived lactate is not merely metabolic waste but an immunosuppressive signal, linking tumor glycolysis to immune evasion.\",\n      \"evidence\": \"Ldha-low tumor cells across immunocompetent, Rag2\\u2212/\\u2212\\u03b3c\\u2212/\\u2212, and Ifng\\u2212/\\u2212 mice with NFAT/IFN-\\u03b3 readouts\",\n      \"pmids\": [\"27641098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the lactate sensor in T/NK cells\", \"Mechanism of NFAT suppression by lactate not detailed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified hypoxic transcriptional induction (HIF-1\\u03b1/HIF-2\\u03b1) and activating Y10 phosphorylation (HER2/Src) as parallel routes that boost LDHA activity and promote metastasis via redox control.\",\n      \"evidence\": \"ChIP/luciferase for HIF binding; Y10F mutagenesis, kinase inhibitors, ROS/anoikis assays and xenograft metastasis models\",\n      \"pmids\": [\"28193910\", \"28218905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish structural basis of Y10 phosphorylation on activity\", \"Interplay between transcriptional and PTM control not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended LDHA regulation to chromatin and signaling axes, showing histone-demethylase control at the locus and lactate-driven downstream signaling pathways.\",\n      \"evidence\": \"KDM6B/H3K27me3 ChIP in osteosarcoma; FOXO4 ChIP in gastric cancer; LDHA-NDRG3-ERK-MMP and AMPK/autophagy analyses in vascular and thyroid models\",\n      \"pmids\": [\"33664867\", \"33463054\", \"34973467\", \"33795650\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab studies in distinct disease contexts\", \"Direct vs indirect effects of lactate on each signaling node not fully separated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined LDHA's noncanonical, glycolysis-independent moonlighting functions \\u2014 sustaining Rac1 activity and sequestering eEF2 \\u2014 separating its enzymatic from non-enzymatic oncogenic roles.\",\n      \"evidence\": \"Reciprocal Co-IP and activity-dead LDHA mutants for Rac1; NADH-dependent eEF2 Co-IP with MK-specific Ldha knockout mice and translation assays\",\n      \"pmids\": [\"36536137\", \"35176139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interfaces with Rac1 and eEF2 not structurally mapped\", \"Extent of moonlighting functions across tissues unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed PTM- and RNA-mediated layers (succinylation, m6A, scaffolding RNAs) that fine-tune LDHA activity and translation beyond transcription.\",\n      \"evidence\": \"Mass-spec succinylation mapping with SIRT5/GLTC competition; METTL3 m6A MeRIP with YTHDF1; circVAMP3/FKBP10 scaffolding of Y10 phosphorylation\",\n      \"pmids\": [\"37031273\", \"35832094\", \"35525866\", \"38233415\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-talk among multiple PTMs on the same enzyme not integrated\", \"Most findings from single labs in individual cancer types\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cemented lactate as an epigenetic and protein-stability signal through histone and non-histone lactylation, and added lipid/nitrosylation PTM control of LDHA's redox output.\",\n      \"evidence\": \"H3K18la ChIP at TPI1/JunB promoters; NLRP3 K245 and NUSAP1 lactylation; ZDHHC9 C163 palmitoylation and BH4/NO C163/C293 S-nitrosylation with conditional mouse models\",\n      \"pmids\": [\"39086231\", \"38905316\", \"39548367\", \"38331089\", \"38689083\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether lactylation targets are direct LDHA substrates or downstream of bulk lactate unresolved\", \"Functional mutagenesis of nitrosylation sites not fully reported\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the dense, partly overlapping network of LDHA PTMs and transcriptional inputs is coordinated in a single cell, and which moonlighting functions dominate in physiological versus disease settings, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating PTM cross-talk on residues such as C163 (palmitoylation vs S-nitrosylation)\", \"Structural basis of non-enzymatic partner binding undefined\", \"Relative contribution of enzymatic vs moonlighting roles in vivo unquantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 4, 5, 6, 8]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [23, 24, 25, 35]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [6, 8, 14, 20]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 36, 33]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [24, 25, 35]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 27, 28, 29]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAC1\", \"EEF2\", \"SIRT5\", \"ZDHHC9\", \"FKBP10\", \"TXNRD1\", \"NLRP3\", \"KCNK1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}