{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSIRT3 is a mitochondrial NAD⁺‐dependent deacetylase that plays a critical role in metabolic regulation and tumor suppression. It modulates cellular energy homeostasis by deacetylating key metabolic enzymes—such as isocitrate dehydrogenase 2, glutamate dehydrogenase, pyruvate dehydrogenase subunit A1, pyruvate dehydrogenase phosphatase 1, and long‐chain acyl‐CoA dehydrogenase—to optimize substrate oxidation, NADPH production, and fatty acid oxidation. Through these actions, SIRT3 suppresses the Warburg effect by destabilizing hypoxia-inducible factor 1α (HIF‑1α) and thereby limits glycolytic reprogramming in tumor cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its metabolic effects, SIRT3 orchestrates cellular stress responses and maintains mitochondrial integrity by targeting a broad spectrum of proteins. It is synthesized as an inactive precursor that is proteolytically activated upon import into the mitochondria, and it deacetylates substrates including histone H4 lysine 16, superoxide dismutase 2 (SOD2), FOXO transcription factors, and the proapoptotic machinery component Ku70. These deacetylation events alleviate oxidative stress, prevent aberrant mitochondrial reactive oxygen species (ROS) accumulation, safeguard mitochondrial DNA integrity in part through modulating p53 activity, and ultimately inhibit apoptosis in cardiomyocytes, neurons, and hepatocytes. Proteomic analyses have further revealed that SIRT3 dynamically interacts with mitochondrial complexes—such as components of ATP synthase—to rapidly deacetylate matrix proteins in response to mitochondrial membrane potential fluctuations."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurthermore, SIRT3 has emerged as a pivotal determinant of organismal longevity and a promising therapeutic target in age-related diseases. Genetic variations in SIRT3 correlate with extended lifespan, and its loss or dysfunction predisposes to a wide range of pathologies—including cancer, renal fibrosis, cardiovascular dysfunction, neurodegeneration, and musculoskeletal degeneration—by promoting aberrant glycolysis, impaired autophagy, ferroptosis, and inflammatory responses. Experimental models have demonstrated that pharmacologic activation of SIRT3 (for example, through agents such as melatonin or nicotinamide mononucleotide) can restore mitochondrial redox balance, improve autophagic clearance, and ameliorate degenerative processes in tissues as diverse as the kidney, liver, bone, and intervertebral discs. 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