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Adipocyte JAK2 Regulates Hepatic Insulin Sensitivity Independently of Body
Composition, Liver Lipid Content, and Hepatic Insulin Signaling.

Authors	Corbit KC, Camporez JPG, Edmunds LR, Tran JL, Vera NB, Erion DM, Deo RC, Perry RJ, Shulman GI, Jurczak MJ, Weiss EJ
Submitted By	Submitted Externally on 2/19/2018
Status	Published
Journal	Diabetes
Year	2018
Date Published	2/1/2018
Volume : Pages	67 : 208 - 221
PubMed Reference	29203511
Abstract	Disruption of hepatocyte growth hormone (GH) signaling through disruption ofJak2(JAK2L) leads to fatty liver. Previously, we demonstrated that development of fatty liver depends on adipocyte GH signaling. We sought to determine the individual roles of hepatocyte and adipocyteJak2on whole-body and tissue insulin sensitivity and liver metabolism. On chow, JAK2L mice had hepatic steatosis and severe whole-body and hepatic insulin resistance. However, concomitant deletion ofJak2in hepatocytes and adipocytes (JAK2LA) completely normalized insulin sensitivity while reducing liver lipid content. On high-fat diet, JAK2L mice had hepatic steatosis and insulin resistance despite protection from diet-induced obesity. JAK2LA mice had higher liver lipid content and no protection from obesity but retained exquisite hepatic insulin sensitivity. AKT activity was selectively attenuated in JAK2L adipose tissue, whereas hepatic insulin signaling remained intact despite profound hepatic insulin resistance. Therefore, JAK2 in adipose tissue is epistatic to liver with regard to insulin sensitivity and responsiveness, despite fatty liver and obesity. However, hepatocyte autonomous JAK2 signaling regulates liver lipid deposition under conditions of excess dietary fat. This work demonstrates how various tissues integrate JAK2 signals to regulate insulin/glucose and lipid metabolism.

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