SIRT1/HIF-1α pathway

Overview

The SIRT1/HIF-1α pathway is a signaling axis in which the NAD⁺-dependent deacetylase Sirtuin 1 (SIRT1) regulates the stability and transcriptional activity of hypoxia-inducible factor 1-alpha (HIF-1α), linking cellular energy and redox state to the response to low oxygen. SIRT1 senses the NAD⁺/NADH ratio and deacetylates histone and non-histone substrates, including transcription factors such as FOXO3 and TP53. HIF-1α is the oxygen-labile subunit of the HIF-1 heterodimer: under normoxia it is hydroxylated by prolyl hydroxylases and degraded via the von Hippel-Lindau ubiquitin ligase, whereas under hypoxia it is stabilized, dimerizes with HIF-1β, and drives transcription of genes governing glycolysis, angiogenesis, and cell survival, notably VEGF and the glycolytic enzyme PKM2. Because SIRT1 activity depends on NAD⁺ and hypoxic metabolic reprogramming shifts NAD⁺ availability, the two arms of the axis are reciprocally coupled, making the pathway a node where metabolic supply, oxygen sensing, and gene expression are integrated.

This position at the interface of metabolism and stress signaling makes the pathway relevant across ischemic, inflammatory, fibrotic, metabolic, and neoplastic conditions, and both arms are pharmacologically tractable. In cerebral ischemia and ischemia-reperfusion injury, HIF-1α stabilization influences angiogenesis, blood–brain barrier integrity, and matrix metalloproteinase-9 activity, while SIRT1 activation is associated with reduced oxidative stress and apoptosis through effects on reactive oxygen species, superoxide dismutase, catalase, glutathione, heme oxygenase 1, and caspase-3. SIRT1 signaling also restrains NLRP3 inflammasome activation and the downstream caspase-1–dependent release of IL-1β and IL-18, a mechanism invoked in arthritis, steatohepatitis, and neuroinflammation, and it intersects with TGF-β1/SMAD signaling in fibrosis and with PI3K/AKT/mTOR and GSK-3β signaling in cell survival and metabolic adaptation. In tumors, HIF-1α-driven glycolysis and angiogenesis contribute to therapy resistance and shape responses to modalities such as photodynamic and photochemotherapy and to cytotoxic agents including doxorubicin and cisplatin. Interventions used to probe or manipulate the axis include SIRT1 activators such as resveratrol, NAD⁺ precursors such as nicotinamide mononucleotide, and a range of plant-derived compounds and HIF-directed agents.

Recent Publications Summary

Recent studies have examined the SIRT1/HIF-1α pathway as a mechanistic node linking metabolic stress, hypoxia responses, inflammation, and tissue remodeling across diverse disease models. In metabolic and fibrotic settings, Qingluo Tongbi Formula was reported to attenuate Tripterygium wilfordii Hook. f.-induced hepatic metabolic dysfunction and oxidative stress via the SIRT1/HIF-1α pathway 41679357Feb, while another study found that Glyasperin F activated Sirt1 and suppressed PI3K/AKT/HIF-1α signaling to inhibit glycolytic metabolism and improve rheumatoid arthritis-associated interstitial lung disease 42216775May. In ischemic injury, Danshen-Chuanxiong was shown to alleviate cerebral ischemia by regulating carnitine metabolism and angiogenesis through activation of the CPT1/HIF-1α signaling axis 42431282Jul, and NADPH was reported to exert neuroprotection in ischemic stroke partly through HIF-1α-associated preservation of blood-brain barrier integrity and promotion of angiogenesis 41638470Feb.

Several publications also linked HIF-1α modulation to anti-tumor and anti-hypoxic strategies. Interstitial photodynamic therapy in A549 lung adenocarcinoma xenografts reduced tumor growth and was associated with altered HIF-1α expression alongside changes in apoptosis- and angiogenesis-related markers 42429993Jul. An oxygen self-sufficient nanozyme designed for dual-modal theranostics improved the hypoxic tumor microenvironment and incorporated lificiguat (YC-1), described as an HIF-1α inhibitor, to support anti-angiogenic and anti-metastatic effects 42148594May. In gastric and colorectal cancer, the dual c-met/COX-2 inhibitor AspMet was reported to block HIF-1α among other cancer-promoting pathways, suppressing epithelial-mesenchymal transition, migration, invasion, and angiogenesis 41924840Apr. Betulinic acid was also associated with downregulation of HIF1A in triple-negative breast cancer cells, together with increased apoptosis and altered miR-21-related signaling 42143107May.

Other studies focused on SIRT1-centered regulation of stress responses and cell survival, which may intersect with hypoxia-related signaling. Nicotinamide mononucleotide improved high glucose/high fat-induced cardiomyocyte metabolic dysfunction through SIRT1-mediated CPT1A stabilization 42429864Jul, and resveratrol was reported to improve cognitive impairment in an Aβ1-42-induced Alzheimer’s disease model partly through SIRT1/NF-κB-associated autophagy activation 42412302Jul. electroacupuncture promoted synaptic recovery after cerebral ischemia-reperfusion by activating SIRT1 and inhibiting NF-κB 42149357May, while corynoxine protected against traumatic brain injury through the SIRT1/p53/SLC7A11 axis and ferroptosis inhibition 41935650Apr. In rheumatoid arthritis, Panax notoginseng saponins were reported to inhibit Th17 differentiation by suppressing HIF-1α/PKM2-mediated glycolysis 42429989Jul, and Lingguizhugan Decoction was investigated for lung inflammation in obstructive sleep apnea through ROS and HIF-1α signaling 41866771Mar.

What Changes, What Holds

1. Metabolic and fibrotic models now place the axis in disease-specific remodeling programs rather than only generic stress coupling
NEW DIRECTION Qingluo Tongbi Formula and Glyasperin F extend the axis into hepatic metabolic dysfunction, rheumatoid arthritis–associated interstitial lung disease, and glycolytic remodeling, but they do not displace the established view that SIRT1/HIF-1α links energy state, hypoxia, inflammation, and fibrosis. What changes is emphasis: the pathway is being used as a mechanistic handle on tissue remodeling and metabolic reprogramming in specific disease contexts 41679357Feb42216775May.

2. Hypoxia-directed interventions are being used as anti-tumor tools, but the core HIF-1α model remains intact
REINFORCES These studies sharpen the baseline claim that HIF-1α drives angiogenesis, metastasis, and therapy resistance in cancer, because the new work again treats HIF-1α suppression or hypoxic microenvironment correction as a therapeutic strategy. The added value is practical rather than conceptual: it broadens the range of tumor settings and delivery platforms, but it does not challenge the established role of HIF-1α in tumor adaptation 42429993Jul42148594May.

3. SIRT1-centered stress protection is expanding into additional injury and neurodegenerative settings without altering the axis itself
NEW DIRECTION Nicotinamide mononucleotide, resveratrol, electroacupuncture, and corynoxine place SIRT1-linked survival signaling in cardiometabolic dysfunction, Alzheimer’s disease, ischemia-reperfusion recovery, and ferroptosis control, while the rheumatoid arthritis and sleep-apnea findings add HIF-1α-linked immune and inflammatory readouts. The baseline already allows SIRT1 to restrain oxidative stress and apoptosis, so these reports mainly extend the map of where that protection is being invoked rather than revising the mechanism 42429864Jul42412302Jul.