Effect of leptin infusion on insulin sensitivity and lipid metabolism in diet-induced lipodystrophy model mice
Open Access
- 18 March 2008
- journal article
- research article
- Published by Springer Science and Business Media LLC in Lipids in Health and Disease
- Vol. 7 (1), 8
- https://doi.org/10.1186/1476-511x-7-8
Abstract
Lipodystrophies are rare acquired and genetic disorders characterized by the complete or partial absence of body fat with a line of metabolic disorders. Previous studies demonstrated that dietary conjugated linoleic acid (CLA) induces hepatic steatosis and hyperinsulinemia through the drastic reduction of adipocytokine levels due to a paucity of adipose tissue in mice and the pathogenesis of these metabolic abnormalities in CLA-fed mice is similar to that in human lipodystrophy. The present study explores the effect of leptin infusion on the pathogenesis of diet-induced lipodystrophy in mice. C57BL/6N mice were assigned to three groups: (1) mice were fed a semisynthetic diet supplemented with 6% corn oil and infused PBS intraperitoneally (normal group), (2) mice were fed a semisynthetic diet supplemented with 4% corn oil plus 2% CLA and infused PBS intraperitoneally (lipodystrophy-control group), and (3) mice were fed a semisynthetic diet supplemented with 4% corn oil plus 2% CLA and infused recombinant murine leptin intraperitoneally (lipodystrophy-leptin group). All mice were fed normal or lipodystrophy model diets for 4 weeks and were infused intrapeneally 0 or 5 μ g of leptin per day from third week of the feeding period for 1 week. The results indicate that leptin infusion can attenuate hepatic steatosis and hyperinsulinemia through the reduction of hepatic triglyceride synthesis and the improvement of insulin sensitivity in diet-induced lipodystrophy model mice. We expect the use of this model for clarifying the pathophysiology of lipodystrophy-induced metabolic abnormalities and evaluating the efficacy and safety of drug and dietary treatment.Keywords
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