Chemical and Pharmaceutical Bulletin
Online ISSN : 1347-5223
Print ISSN : 0009-2363
ISSN-L : 0009-2363
Platelet Activating Factor (PAF) Antagonists Contained in Medicinal Plants : Lignans and Sesquiterpenes
Satoshi IWAKAMIJin-Bin WUYutaka EBIZUKAUshio SANKAWA
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1992 Volume 40 Issue 5 Pages 1196-1198

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Abstract

Hot aqueous extracts of medicinal plants were tested for their inhibitory effect on the binding of platelet activating factor (PAF) to rabbit platelets. The extracts of Forsythia suspensa VAHL. (Oleaceae), Arctium lappa L. (Compositae) and Centipeda minima (L.) A. BRAUN et ASCHERS (Compositae) showed significant activities. Since the main constituents of F. suspensa and A. lappa are lignans, 30 lignans were tested for their inhibitory effects on PAF binding to platelets and 9 lignans were found active. Four sesquiterpenes were isolated as active compounds from C. minima. In particular 6-O-angeloylplenolin and 6-O-senecioylplenolin are the most potent and specific PAF antagonists found in this study.

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© The Pharmaceutical Society of Japan
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