Abstract
Two cyclodidepsipeptides, 3-(2-methylpropyl)-6-(propan-2-yl)-4-methyl-morpholine-2,5-dione (1) and 3,6-di(propan-2-yl)-4-methyl-morpholine-2,5-dione (2), were evaluated for inhibitory activity against commercial enzyme xanthine oxidase (XO) in vitro and XO in rat liver homogenate as well as for anti-inflammatory response on human peripheral blood mononuclear cells (PBMCs). Both of cyclodidepsipeptides were excellent inhibitors of XO and significantly suppressed the nuclear factor of κB (NF-κB) activation. Allopurinol, a widely used XO inhibitor and drug to treat gout, relevated stronger inhibitory effect on rat liver XO activity than those of compounds 1 and 2. Molecular docking studies were performed to gain an insight into their binding modes with XO. The studied morpholine-diones derivatives exerting XO inhibition and anti-inflammatory effect may give a promise to be used in the treatment of gout and other excessive uric acid production or inflammatory conditions.
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