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【求助】一篇JBC文獻,請伸出援助之手! 已有1人參與
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【題名】:MAPK pathway activation delays G2/M progression by destabilizing Cdc25B 【作者】:Astuti P, Pike T, Widberg C, Payne E, Harding A, Hancock J, Gabrielli B 【雜志名全稱】:J Biol Chem 【年, 卷(期), 起止頁碼】:2009 Dec 4;284(49):33781-8 【DOI】: 【全文鏈接】:http://www.jbc.org/content/284/49/33781.long 【摘要信息】:Activation of the mitogen-activated protein kinase (MAPK) pathway by growth factors or phorbol esters during G(2) phase delays entry into mitosis; however, the role of the MAPK pathway during G(2)/M progression remains controversial. Here, we demonstrate that activation of the MAPK pathway with either epidermal growth factor or 12-O-tetradecanoylphorbol-13-acetate induces a G(2) phase delay independent of known G(2) phase checkpoint pathways but was specifically dependent on MAPK/extracellular signal-regulated kinase kinase (MEK1). Activation of MAPK signaling also blocked exit from a G(2) phase checkpoint arrest. Both the G(2) phase delay and blocked exit from the G(2) checkpoint arrest were mediated by the MEK1-dependent destabilization of the critical G(2)/M regulator cdc25B. Reintroduction of cdc25B overcame the MEK1-dependent G(2) phase delay. Thus, we have demonstrated a new function for MEK1 that controls G(2)/M progression by regulating the stability of cdc25B. This represents a novel mechanism by which factors that activate MAPK signaling can influence the timing of entry into mitosis, particularly exit from a G(2) phase checkpoint arrest 【求助者email】:13718103757@163.com |
鐵桿木蟲 (著名寫手)
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