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Chronic apelin treatment improves hepatic lipid metabolism in obese and insulin-resistant mice by an indirect mechanism. | LitMetric

AI Article Synopsis

Article Abstract

Purpose: Apelin treatment has been shown to improve insulin sensitivity in insulin resistant mice by acting in skeletal muscles. However, the effects of systemic apelin on the hepatic energy metabolism have not been addressed. We thus aimed to determine the effect of chronic apelin treatment on the hepatic lipid metabolism in insulin resistant mice. The apelin receptor (APJ) expression was also studied in this context since its regulation has only been reported in severe liver pathologies.

Methods: Mice were fed a high-fat diet (HFD) in order to become obese and insulin resistant compared to chow fed mice (CD). HFD mice then received a daily intraperitoneal injection of apelin (0.1 µmol/kg) or PBS during 28 days.

Results: Triglycerides content and the expression of different lipogenesis-related genes were significantly decreased in the liver of HFD apelin-treated compared to PBS-treated mice. Moreover, at this stage of insulin resistance, the beta-oxidation was increased in liver homogenates of HFD PBS-treated mice compared to CD mice and reduced in HFD apelin-treated mice. Finally, APJ expression was not up-regulated in the liver of insulin resistant mice. In isolated hepatocytes from chow and HFD fed mice, apelin did not induce significant effect.

Conclusions: Altogether, these results suggest that systemic apelin treatment decreases steatosis in insulin resistant mice without directly targeting hepatocytes.

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Source
http://dx.doi.org/10.1007/s12020-018-1536-1DOI Listing

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