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maspirinr

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[交流] 【求助】一篇JBC文献,请伸出援助之手! 已有1人参与

【题名】: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
【杂志名全称】:J Biol Chem
【年, 卷(期), 起止页码】:2009 Dec 4;284(49):33781-8
【DOI】:
【全文链接】: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
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