{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T20:02:04Z","timestamp":1792008124659,"version":"4.4.0"},"reference-count":36,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"1","license":[{"start":{"date-parts":[[2015,9,1]],"date-time":"2015-09-01T00:00:00Z","timestamp":1441065600000},"content-version":"tdm","delay-in-days":1523,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1"}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2011,7]]},"abstract":"<jats:title>\n                           <jats:bold>Abstract:<\/jats:bold>\n                        <\/jats:title>\n          <jats:sec>\n            <jats:title\/>\n            <jats:p>The pathogenesis of nonalcoholic steatohepatitis (NASH) and inflammasome activation involves sequential hits. The inflammasome, which cleaves pro\u2013interleukin-1\u03b2 (pro\u2013IL-1\u03b2) into secreted IL-1\u03b2, is induced by endogenous and exogenous danger signals. Lipopolysaccharide (LPS), a toll-like receptor 4 ligand, plays a role in NASH and also activates the inflammasome. In this study, we hypothesized that the inflammasome is activated in NASH by multiple hits involving endogenous and exogenous danger signals. Using mouse models of methionine choline\u2013deficient (MCD) diet\u2013induced NASH and high-fat diet\u2013induced NASH, we found up-regulation of the inflammasome [including NACHT, LRR, and PYD domains\u2013containing protein 3 (NALP3; cryopyrin), apoptosis-associated speck-like CARD-domain containing protein, pannexin-1, and pro\u2013caspase-1] at the messenger RNA (mRNA) level increased caspase-1 activity, and mature IL-1\u03b2 protein levels in mice with steatohepatitis in comparison with control livers. There was no inflammasome activation in mice with only steatosis. The MCD diet sensitized mice to LPS-induced increases in NALP3, pannexin-1, IL-1\u03b2 mRNA, and mature IL-1\u03b2 protein levels in the liver. We demonstrate for the first time that inflammasome activation occurs in isolated hepatocytes in steatohepatitis. Our novel data show that the saturated fatty acid (FA) palmitic acid (PA) activates the inflammasome and induces sensitization to LPS-induced IL-1\u03b2 release in hepatocytes. Furthermore, PA triggers the release of danger signals from hepatocytes in a caspase-dependent manner. These hepatocyte-derived danger signals, in turn, activate inflammasome, IL-1\u03b2, and tumor necrosis factor \u03b1 release in liver mononuclear cells. <jats:italic toggle=\"yes\">Conclusion:<\/jats:italic> Our novel findings indicate that saturated FAs represent an endogenous danger in the form of a first hit, up-regulate the inflammasome in NASH, and induce sensitization to a second hit with LPS for IL-\u03b2 release in hepatocytes. Furthermore, hepatocytes exposed to saturated FAs release danger signals that trigger inflammasome activation in immune cells. Thus, hepatocytes play a key role in orchestrating tissue responses to danger signals in NASH. 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