The Natural Anticancer Compounds Rocaglamides Inhibit the Raf-MEK-ERK Pathway by Targeting Prohibitin 1 and 2

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• 作者：Gernot Polier ; Jennifer Neumann ; Fr¨¦d¨¦ric Thuaud ; Nigel Ribeiro ; Christoph Gelhaus ; Hendrik Schmidt ; Marco Giaisi ; Rebecca K?hler ; Wolfgang?W. M¨¹ller ; Peter Proksch ; Matthias Leippe ; Ottmar Janssen ; Laurent D¨¦saubry ; Peter?H. Krammer ; Min Li-Weber
• 刊名：Chemistry & Biology
• 出版年：2012
• 出版时间：21 September, 2012
• 年：2012
• 卷：19
• 期：9
• 页码：1093-1104
• 全文大小：1215 K

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Summary

Rocaglamides are potent natural anticancer products that inhibit proliferation of various cancer cells at nanomolar concentrations. We have recently shown that these compounds prevent tumor growth and sensitize resistant cancer cells to apoptosis by blocking the MEK-ERK-eIF4 pathway. However, their direct molecular target(s) remain(s) unknown. In this study, using an affinity chromatography approach we discovered that prohibitin (PHB) 1 and 2 are the direct targets of rocaglamides. Binding of rocaglamides to PHB prevents interaction between PHB and CRaf and, thereby, inhibits CRaf activation and subsequently CRaf-MEK-ERK signaling. Moreover, knockdown of PHB mimicked the effects of rocaglamides on the CRaf-MEK-ERK pathway and cell cycle progression. Thus, our finding suggests that rocaglamides are a new type of anticancer agent and that they may serve as a small-molecular tool for studying PHB-mediated cellular processes.