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Adiponectin and its receptors in rodent models of fatty liver disease and liver cirrhosis

World Journal of Gastroenterology 2006年第34期12卷 5490-5494页

作者： Markus Neumeier Claus Hellerbrand Erwin Gbele Roland Buettner cornelius bollheimer Johanna Weigert Andreas Schffler Thomas S Weiss Monika Lichtenauer Jürgen Schlmerich Christa Buechler Department of Internal Medicine I University of Regensburg D-93042 Regensburg Germany Department of Surgery Center for Liver Cell Research University of Regensburg Germany

AIM： To determine circulating and hepatic adiponectin in rodents with fatty liver disease or liver cirrhosis and investigate expression of the adiponectin receptors AdipoR1 on the mRNA and protein level and AdipoR2 on the mRNA level. METHODS： Fat fed rats were used as a model for fatty liver disease and bile duct ligation in mice to investigate cirrhotic liver. Expression of AdipoR1 and AdipoR2 mRNA was determined by real time RT-PCR. AdipoR1 protein was analysed by immunoblot. Adiponectin was measured by ELISA. RESULTS： Systemic adiponectin is reduced in fatfed rats but is elevated in mice after bile duct ligation （BDL）. Hepatic adiponectin protein is lower in steatotic liver but not in the liver of BE）L-mice when compared to controls. Adiponectin mRNA was not detected in human liver samples or primary human hepatocytes nor in rat liver but recombinant adiponectin is taken up by isolated hepatocytes in-vitro. AdipoR1 mRNA and AdipoR1 protein levels are similar in the liver tissue of control and fat fed animals whereas AdipoR2 mRNA is induced. AdipoR2 mRNA and AdipoR1 mRNA and protein is suppressed in the liver of BDL-mice. CONCLUSION： Our studies show reduced circulating adiponectin in a rat model of fatty liver disease whereas circulating adiponectin is elevated in a mouse model of cirrhosis and similar findings have been described in humans. Diminished hepatic expression of adiponectin receptors was only found in liver cirrhosis.

关键词： Hepatic steatosis Adiponectin Liver cirrhosis Adiponectin receptor 1 Adiponectin receptor 2

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