| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Research Abstract |
A total of 108 specimens of marine sponges, coelenterates, bryozoans, and tunicates were collected from various places along Pacific coasts of Japan and tested for inhibition of phospholipase A_2 derived from porcine pancreas. A total of 46 specimens, including 36 specimens of sponges, 6 gorgonians, 3 bryozoans and 1 tunicate showed activity. Judging from incidence of active specimens and magnitude of activity, sponges were most suitable tangent for isolation of antiinflammatory agents.
From three sponges which were highly active in the screening tests, five active substances together with phospholipid mixture were obtained as phospholipase A_2 inhibitors. Discodermins A-D have been obtained from a sponge of the genus iscodermia and showed IC_<50> 0.6-1.7 mug/ml. Accidentally, discodermin A showed in vivo antiinflammatory activity in mice. Palinurin was isolated from Ircinia sp. collected off the Kii Peninsula. It inhibited phospholipase A_2 with an IC_<50> 5.0 x 10^<-5> M. It is noted that phospholipids isolated an unidentified sponge showed a remarkable activity.
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