Triterpenoids from Ainsliaea latifolia and Their Cyclooxyenase-2 (COX-2) Inhibitory Activities
Wen-Lin Yuan1, Xue-Yun Dong1,2, Zheng-Rui Huang3
1Department of Phytochemistry, School of Pharmacy, Naval Medical University (Second Military Medical University), Shanghai, 200433, China.
Abstract:
Eight new triterpenoids were isolated from Ainsliaea latifolia. The structures of these compounds were elucidated by interpretation of spectroscopic data, including HRESIMS and NMR data. Compounds 4-6 are identified as rare trinorcucurbitane or tetranorcucurbitane triterpenoids. The absolute configurations of compounds 1 and 2 were confirmed by Snatzke's method. All compounds were evaluated for their inhibition against cyclooxyenase-2 (COX-2), in which compound 4 showed significant inhibitory effect against COX-2 with IC50 value of 3.98 ± 0.32 μM, comparable to that of positive control NS-398 (IC50 4.14 ± 0.28 μM).
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