{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPGC‐1β (encoded by PPARGC1B) is a versatile transcriptional coactivator that plays a central role in regulating cellular energy homeostasis. It acts by coactivating key transcription factors such as nuclear respiratory factor‐1 (NRF‐1) and estrogen‐related receptor α (ERRα) to promote mitochondrial biogenesis, stimulating the expression of genes involved in oxidative phosphorylation, fatty acid β‐oxidation, and ATP production. In muscle cells and during myogenic differentiation, PGC‐1β is essential for developing a high mitochondrial content and proper oxidative capacity, while its acetylation state—subject to modification by enzymes like GCN5 and SIRT1—fine‐tunes its transcriptional activity. Notably, PGC‐1β also participates in the ligand‐independent activation of nuclear receptors, such as the constitutive androstane receptor, albeit to a lesser extent than its homologue PGC‐1α."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn various cancer models and disease settings, aberrant expression or regulation of PGC‐1β markedly influences tumor cell metabolism, survival, and progression. Upregulation of PGC‐1β has been implicated in rescuing oxidative phosphorylation defects in tumor cells harboring mitochondrial DNA mutations and in mediating resistance to chemotherapeutic agents (for example, sorafenib in hepatocellular carcinoma) by reducing mitochondrial biogenesis and reactive oxygen species production. In addition, PGC‐1β–dependent pathways contribute to angiogenesis via enhanced vascular endothelial growth factor expression, promote cancer stem cell properties in pancreatic adenocarcinoma through a FOXO3/LKB1/AMPK axis, and are linked genetically to altered risks in various cancers including familial breast cancer and gliomas. Furthermore, mechanistic studies in colon and multiple myeloma models indicate that tumor‐specific stabilization of PGC‐1β—often via interactions with distinct AMPK isoforms or nuclear receptors like RXRβ—supports metabolic reprogramming and glycolytic flux."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic and environmental factors further modulate PGC‐1β expression and its physiological impact. 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