Abstract
To investigate the effects of agar oligosaccharides (AO) on lipid metabolism, changes in obesity phenotypes and related molecular factors were evaluated in C57BL/6N mice fed a high-fat diet (HFD). When HFD-induced obese mice were fed AO, they lost weight. Also, fat accumulation in abdominal and liver tissues was lower in the AO groups than in the Vehicle group. Lipid droplet sizes in tissue sections were reduced by AO, and these observations were mirrored by serum lipid contents. To evaluate the effects of AO on lipid metabolism, lipogenesis and lipolysis-related factors were analyzed. The mRNA expressions of genes involved in lipogenesis, such as adipocyte-protein 2 (aP2) and fatty acid synthase (FAS), were reduced by AO administration, and the expressions of lipolysis-associated proteins, including perilipin, hormone-sensitive lipase (HSL), and fat triglyceride lipase (ATGL), were increased. Taken together, our results suggest that AO should be considered a valuable natural agent that inhibits obesity.
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