A New α,β,γ,δ-Unsaturated carboxylic acid and three new cyclic peroxides from the marine sponge, Monotria japonica, which selectively lyse starfish oocytes without affecting nuclear morphology
摘要:
The marine sponge Monotria japonica contains cytolytic constituents, which have been fractionated to a new alpha,beta,gamma,delta-unsaturated carboxylic acid designated monotriajaponide A (1) and three new cyclic peroxides designated monotriajaponides B (2), C (3), and D (4), in addition to a known peroxide (5) and a known alpha,beta-unsaturated ester (6). The structures were determined on the basis of spectroscopic data. Compounds 1-5 lysed immature starfish (Asterina pectinifera) oocytes without affecting nuclear morphology at the minimum effective concentrations of 50, 6.3, 6.3, 6.3, and 13 mug/mL, respectively. On the other hand, compound 6, at the minimum effective concentration of 25 mug/mL, lysed both oocyte's plasma membrane and the nuclear envelope. (C) 2003 Elsevier Science Ltd. All rights reserved.