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Triglyceride with Medium-Chain Fatty Acids Increases the Activity and Expression of Hormone-Sensitive Lipase in White Adipose Tissue of C57BL/6J Mice

We have previously shown that medium-chain triglyceride (MCT) resulted in significantly less body fat mass than long-chain triglyceride (LCT) did in hypertriglyceridimic subjects. The possible mechanism for this was investigated by measuring and analyzing changes in the body fat, blood lipid profile, enzymatic level and activity of hormone-sensitive lipase (HSL) and its mRNA expression, and levels of cyclic adenosine monophosphate (cAMP) and protein kinase A (PKA) in white adipose tissue (WAT) of C57BL/6J mice fed for 16 weeks on an MCT or LCT diet. MCT induced lower body weight and body fat, and an improved blood lipid profile than LCT did. The enzymatic level and activity of HSL and its mRNA expression, and the levels of cAMP and PKA were significantly higher in WAT of mice fed with the MCT diet. No significant differences in the levels of lipoprotein lipase and peroxisome proliferator-activated receptor-γ in WAT were apparent between the effects of MCT and LCT. It is concluded that lipolysis by the increased level and activity of HSL, which was induced by the activation of cAMP-dependent PKA in WAT, was partially responsible for the lower fat accumulation in C57BL/6J mice fed with MCT.