Bioactivity-guided screening identifies pheophytin a as a potent anti-hepatitis C virus compound from Lonicera hypoglauca
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- 作者：Sheng-Yang Wang ; Ching-Ping Tseng ; Keng-Chang Tsai ; Chia-Fan Lin ; Ching-Ya Wen ; Hsin-Sheng Tsay ; Naoya Sakamoto ; Chin-Hsiao Tseng ; Ju-Chien Cheng
- 关键词：Hepatitis C virus ; Lonicera hypoglauca Miq. ; Pheophytin a ; Replicon cells
- 刊名：Biochemical and Biophysical Research Communications
- 出版年：2009
- 出版时间：24 July 2009
- 年：2009
- 卷：385
- 期：2
- 页码：230-235
- 全文大小：563 K
文摘
Chronic hepatitis C virus (HCV) infection is a worldwide public issue. In this study, we performed bioactivity-guided screening of the Lonicera hypoglauca Miq. crude extracts to find for naturally chemical entities with anti-HCV activity. Pheophytin a was identified from the ethanol-soluble fraction of L. hypoglauca that elicited dose-dependent inhibition of HCV viral proteins and RNA expression in both replicon cells and cell culture infectious system. Computational modeling revealed that pheophytin a can bind to the active site of HCV-NS3, suggesting that NS3 is a potent molecular target of pheophytin a. Biochemical analysis further revealed that pheophytin a inhibited NS3 serine protease activity with IC50 = 0.89 μM. Notably, pheophytin a and IFNα-2a elicited synergistic anti-HCV activity in replicon cells with no significant cytotoxicity. This study thereby demonstrates for the first time that pheophytin a is a potent HCV-NS3 protease inhibitor and offers insight for development of novel anti-HCV regimens.