Hepatocyte-specific deletion of Janus kinase 2 (JAK2) protects against diet-induced steatohepatitis and glucose intolerance

Sally Yu Shi, Rubén García Martin, Robin E. Duncan, Diana Choi, Shun Yan Lu, Stephanie A. Schroer, Erica P. Cai, Cynthia T. Luk, Kathryn E. Hopperton, Anthony F. Domenichiello, Christine Tang, Mark Naples, Mark J. Dekker, Adria Giacca, Khosrow Adeli, Kay Uwe Wagner, Richard P. Bazinet, Minna Woo

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Non-alcoholic fatty liver disease (NAFLD) is becoming the leading cause of chronic liver disease and is now considered to be the hepatic manifestation of the metabolic syndrome. However, the role of steatosis per se and the precise factors required in the progression to steatohepatitis or insulin resistance remain elusive. The JAK-STAT pathway is critical in mediating signaling of a wide variety of cytokines and growth factors. Mice with hepatocyte-specific deletion of Janus kinase 2 (L-JAK2 KO mice) develop spontaneous steatosis as early as 2 weeks of age. In this study, we investigated the metabolic consequences of jak2 deletion in response to diet-induced metabolic stress. To our surprise, despite the profound hepatosteatosis, deletion of hepatic jak2 did not sensitize the liver to accelerated inflammatory injury on a prolonged high fat diet (HFD). This was accompanied by complete protection against HFD-induced wholebody insulin resistance and glucose intolerance. Improved glucose-stimulated insulin secretion and an increase in β-cell mass were also present in these mice. Moreover, L-JAK2 KO mice had progressively reduced adiposity in association with blunted hepatic growth hormone signaling. These mice also exhibited increased resting energy expenditure on both chow and high fat diet. In conclusion, our findings indicate a key role of hepatic JAK2 in metabolism such that its absence completely arrests steatohepatitis development and confers protection against diet-induced systemic insulin resistance and glucose intolerance.

Original languageEnglish (US)
Pages (from-to)10277-10288
Number of pages12
JournalJournal of Biological Chemistry
Issue number13
StatePublished - Mar 23 2012

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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