Eurycomanone regulates lipid metabolism by activating the cAMP/PKA pathway
zhihui, J.; Han, H.; Li, S.; Tian, J.; Gao, Z.; Huang, W.; Zhang, D.; Ouyang, H.; Feng, Y.
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Eurycoma longifolia Jack (ELJ) contains mainly alkaloids, and quassinoids, which are the main active ingredients. Eurycomanone (EN), one of the most common quassinoids, is said to have beneficial effects on lipid and glucose metabolism. In this study, we investigated the effects of EN on lipolysis by establishing a high-fat animal model in vivo and evaluated its efficacy as a lipolytic and anti-fatty liver agent. Oil red O staining showed morphological changes of 3T3-L1 preadipocytes after EN treatment and confirmed the inhibitory effects of EN on adipocyte differentiation. The mechanism of EN promotes lipolysis in 3T3-L1 cells was analyzed by immunofluorescence, Western blotting, quantitative real-time PCR and siRNA transfection. In C57BL/6J mice fed a high-fat diet, intragastric administration of EN (5 mg/kg and 10 mg/kg) for two weeks, decreased fat droplet mass and size, and reduced fat accumulation in the liver. Furthermore, EN activated PKA and promoted the PKA/hormone sensitive lipase lipolysis signaling pathway, thereby increasing the release of glycerol and free fatty acids from adipocytes. Our findings indicate the potential of EN as a promising alternative pharmacologic agent for the prevention of obesity.
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