Inhibition of Chitin Synthases and Antifungal Activities by 2'-Benzoyloxycinnamaldehyde from Pleuropterus ciliinervis and Its Derivatives(Pharmacognosy)

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In the course of search for potent chitin synthase inhibitors from natural resources, a novel chitin synthases inhibitor, 2'-benzoyloxycinnamaldehyde (2'-BCA) (I), was isolated from the aerial parts of Pleuropterus ciliinervis NAKAI. 2'-BCA inhibited chitin synthase 1 and 2 of Saccharomyces cerevisiae with the IC_<50>s of 54.9 and 70.8 μg/ml, respectively, whereas it exhibited no inhibitory activity for chitin synthase 3 up to 280 μg/ml. Its derivatives, 2'-chloro- (V) and 2(-bromo-cinnamaldehyde (VI), each showed 1.9 and 2.7-fold stronger inhibitory activities than 2'-BCA, with the IC_<50>s of 37.2 and 26.6 μg/ml, respectively. Especially, the IC_<50> of compound VI against chitin synthase 2 represented 1.7-fold more potent inhibitory activity than polyoxin D, a well-known chitin synthase inhibitor. Furthermore, compounds V and VI showed potent antifungal activities against various fungi including human pathogenic fungi, with a particularly strong inhibitory activity against Cryptococcus neoforntans (MIC=16 μg/ml). Although the chemical synthesis of this compound has been reported, the present study is the first report to describe the isolation of 2'-BCA from natural resources and chitin synthases inhibitory activities of its derivatives. These results suggested that 2'-BCA and its derivatives can potentially serve as useful lead compounds for development of antifungal agents.
公益社団法人日本薬学会の論文
2007-03-01