ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2026
A Hepatocyte-to-Stellate Cell Axis Couples Alternate-Day Fasting to Liver Fibrosis Resolution via ATG7 S-Nitrosylation.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Communication between hepatocytes and hepatic stellate cells (HSCs) is essential for liver homeostasis, yet its potential role in mitigating fibrosis remains largely unexplored. Here, we define a protective signaling axis from hepatocytes to HSCs, mediated by hepatocyte-expressed eNOS, that restrains HSC activation and fibrotic progression. In human fibrotic liver samples and mouse models, eNOS expression is markedly suppressed, and its hepatocyte-specific deletion aggravates injury and fibrosis. We further establish that the anti-fibrotic benefits of alternate-day fasting (ADF) critically depend on this intercellular pathway. ADF enhanced hepatocyte eNOS expression, and hepatocyte-specific eNOS knockout abolished the protective metabolic and anti-fibrotic effects of ADF. Mechanistically, ADF downregulates the mitochondrial chaperone SDHAF4, thereby suspending complex II assembly and promoting eNOS-derived nitric oxide (NO) production. The resulting NO acts in a paracrine manner on HSCs to induce S-nitrosylation of ATG7 at cysteine 184, which in turn constraining autophagic flux and preventing HSC transdifferentiation. Our study reveals a fasting-responsive hepatocyte-stellate cell circuit that protects against liver fibrosis, highlighting the eNOS/NO/ATG7 S-nitrosylation axis as a tractable therapeutic target.
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