Inhibition of monoamine oxidase by stilbenes from Rheum palmatum
Author(s):
Bo Wei , Zhongduo Yang* , Dan , Feng Shi , Xiaojun Yao , Minggang Wang
Abstract:
Seven stilbenes and one catechin were bioactivity-guidedly isolated from the rhizomes of Rheum palmatem. Their structures were identified as piceatannol(1), resveratrol(2), piceid(3), rhapontigenin(4), piceatannol-3'-O-β-D-glucopyranoside(5), rhaponticin(6), catechin(7) and desoxyrhapontigenin(8). Anti-monoamine oxidase (MAO) activities of compounds 18 were tested. Compounds 1 and 8 showed significant MAO inhibitory activities with IC50 values 16.4±1.5 μM and 11.5±.1.1, respectively, when the IC50 value of iproniazid as a standard was 6.5 ±0.5 μM. The selectivity of compounds 1-8 against MAO-A and MAO-B were also evaluated. The results showed that compounds 4、6、8 preferred to inhibit MAO-A rather than MAO-B with selectivity values ([IC50 of MAO-B]/ [IC50 of MAO-A]) of 4.74, 10.01 and 9.42, respectively . The preliminary structureactivity relationships (SARs) of these compounds were discussed and the molecular modeling was also performed to explore the binding mode of inhibitors at the active site of MAO-A and MAO-B.
Keywords:
Language:
English
Published:
Iranian Journal of Pharmaceutical Research, Volume:15 Issue: 4, Autumn 2016
Pages:
885 to 892
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