Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
Anti-complementary Activity of Ursane-Type Triterpenoids from Weigela subsessilis
Phuong Thien ThuongByung-Sun MinWenYi JinMinKyun NaJongPill LeeRackSeon SeongYoung-Mi LeeKyungSik SongYeonHee SeongHyeong-Kyu LeeKiHwan BaeSam Sik Kang
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2006 Volume 29 Issue 4 Pages 830-833


A new ursane-type triterpenoid, weigelic acid (1), and seven known compounds, ursolic acid (2), ilekudinol A (3), corosolic acid (4), ilekudinol B (5), esculentic acid (6), pomolic acid (7), and asiatic acid (8) were isolated from the leaf and stem of Weigela subsessilis. The structure of the new triterpenoid was established as 1β,2α,3α,23-tetrahydroxyurs-12-en-28-oic acid on the basis of spectroscopic analyses. In addition, the isolated compounds were evaluated for their anti-complement activity against the classical pathway of the complement system. Of these, compounds 1—2 and 4—8 exhibited anti-complement activity with IC50 values of 152, 90, 130, 51, 56, 4, and 163 μM, respectively, whereas 3 was inactive. This shows that a carboxylic group of ursane-type triterpenoids seems to play an important role in inhibiting the hemolytic activity of human serum against erythrocytes.

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© 2006 The Pharmaceutical Society of Japan
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