sirtuin 1
sirtuin 1
Overview
Sirtuin 1 (SIRT1) is a highly conserved NAD⁺-dependent deacetylase belonging to the sirtuin family of class III histone deacetylases. It functions as a master metabolic and stress-response regulator, modulating gene expression through post-translational modification of both histone and non-histone protein substrates. SIRT1 removes acetyl groups from lysine residues on target proteins — including tumor protein p53, FOXO1, peroxisome proliferator-activated receptor alpha (PPARA), and numerous chromatin-associated factors — thereby influencing downstream programs governing energy homeostasis, oxidative stress defense, inflammation, autophagy, and cell survival. Its catalytic activity is intrinsically coupled to cellular NAD⁺/NADH redox status, making it a direct sensor of metabolic state and a critical node linking nutrient availability to transcriptional output.
SIRT1 exerts broad physiological influence across multiple organ systems. In the nervous system, it suppresses oxidative stress and inflammatory signaling, conferring neuroprotection. In metabolic tissues, it partners with AMP-activated protein kinase (PRKAA1/AMPK) to coordinate energy sensing and mitochondrial quality control, in part through crosstalk with the mechanistic target of rapamycin kinase (mTOR) and the PI3K/AKT/mTOR pathway. Given its central role in aging-associated processes, SIRT1 has emerged as a compelling target in research spanning neurodegeneration, cancer, reproductive dysfunction, renal disease, and cardiovascular disease.
Focus of Latest Publications
Recent literature demonstrates that SIRT1 occupies a convergent position across a diverse range of disease contexts, consistently acting as a protective or regulatory hub whose activity is perturbed in pathological states.
Neurodegeneration and Alzheimer's disease. A 2026 study in Molecular Biology Reports (PMID 42268445) explored dexmedetomidine as a neuroprotective agent in a rat model of Alzheimer's disease, identifying the AMPK/SIRT1 pathway as a key regulator of neuronal energy homeostasis and survival. The findings suggest that pharmacological activation of this axis may attenuate neurodegeneration by restoring metabolic and redox balance in neurons. Complementarily, a review in Cellular and Molecular Neurobiology (PMID 41811567) on intermittent fasting and brain aging highlighted that fasting-induced shifts in ATP and ADP levels activate both AMPK and Sirtuin 1 pathways, promoting autophagosome formation and suppressing mTOR — an inhibitor of autophagy. This mechanism positions SIRT1 as a mediator between dietary patterns, cellular senescence, and neuroprotection.
Cancer Biology. In lung adenocarcinoma, a study in the British Journal of Cancer (PMID 41942609) identified a novel microprotein, L3EMP, that promotes tumor progression by catalyzing the deubiquitination of SIRT1, thereby stabilizing it in a cancer-promoting context. This finding reveals that SIRT1 protein stability can be co-opted by upstream regulators to drive Malignant Disease progression, adding a post-translational layer of complexity to its oncological role. In breast cancer research (PMID 42055667, Academic Radiology), optical redox imaging of MDA-MB-231 cells demonstrated that SIRT1 and FOXO1 were upregulated in association with PGC1α gene expression, with their activities both influencing and being influenced by the NAD⁺/NADH ratio — directly linking SIRT1 to the bioenergetic phenotype of cancer cells.
Renal Disease and Aging. A study in the Journal of Molecular Medicine (PMID 42209799) investigated how SIRT1 governs calcium oxalate (CaOx) crystal-induced mitochondrial dysfunction and renal fibrosis in aged mice. The research found that SIRT1 acts through PPARA to regulate mitochondrial integrity, and that age-related decline in SIRT1 activity exacerbates CaOx-induced damage, suggesting that SIRT1 is a critical brake on fibrotic renal degeneration in the aging kidney.
Liver Ischemia-Reperfusion Injury. In aged mice, hepatic ischemia-reperfusion injury (IRI) was studied in Biochemical and Biophysical Research Communications (PMID 41775225), revealing that the Sirt1–eIF2α axis drives pro-inflammatory macrophage activation through endoplasmic reticulum stress. The IRI condition led to reduced Sirt1 activity and impaired deacetylase function, causing eIF2α hyperacetylation and subsequent amplification of inflammatory signaling. This study situates SIRT1 as a suppressor of liver inflammation and implicates its dysfunction in metabolic dysfunction–associated steatotic liver disease-relevant pathology.
Reproductive Biology and Polycystic Ovary Syndrome. Research published in Reproduction (PMID 41949882) demonstrated that melatonin attenuates excessive mitochondrial fission in granulosa cells derived from polycystic ovary syndrome (PCOS) models by upregulating SIRT1. Mechanistically, SIRT1 restored the balance of Drp1 phosphorylation and blocked its MFF-dependent mitochondrial recruitment, preventing pathological mitochondrial fragmentation in cumulus cells and KGN cells. Dihydrotestosterone was used to model the hyperandrogenic PCOS environment, with β-nicotinamide mononucleotide employed as a therapeutic intervention to boost SIRT1 activity.
Neuroprotection and Dietary Interventions. A Molecular Biology Reports study (PMID 42201597) examined the effects of a sunflower oil-based high-fat diet on brain antioxidant defense and neuroinflammation in rats, finding that SIRT1 activity was modulated by dietary fat composition. L-arginine supplementation provided a protective effect, partly by preserving SIRT1 activity and thereby suppressing oxidative stress and proinflammatory cytokine signaling. A review in Nutrients (PMID 41830033) further catalogued how bioactive natural products — including 2-phenylchromane flavonoids and carotenoids — regulate autophagy and longevity by modulating AMPK, PI3K/AKT/mTOR, SIRT1, and FOXO pathways, while alleviating oxidative stress and mitochondrial dysfunction.
Network Pharmacology and Target Identification. A computational study in the Journal of Molecular Graphics & Modelling (PMID 41691789) employed network pharmacology to screen bioactive compounds from Vernonia amygdalina for fever-related targets, identifying SIRT1 alongside TP53 and HDAC1 as central nodes in the pharmacological network, underscoring the protein's relevance as a druggable target in inflammatory and febrile conditions.