Chronophin mediates an ATP-sensing mechanism for cofilin dephosphorylation and neuronal cofilin-actin rod formation.

Chronophin mediates an ATP-sensing mechanism for cofilin dephosphorylation and neuronal cofilin-actin rod formation.
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DOI:
10.1016/j.devcel.2008.09.017
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发表时间:
2008-11
期刊:
影响因子:
11.8
通讯作者:
Bokoch, Gary M.
Bokoch, Gary M.
中科院分区:
生物学1区
文献类型:
--
作者:
Huang, Timothy Y.;Minamide, Laurie S.;Bamburg, James R.;Bokoch, Gary M.

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肌动蛋白和它的关键调控成分cofilin在能量应激下的神经元中以大棒状的组合形式存在。这种内含物在阿尔茨海默病的大脑中也丰富,并出现在神经变性的转基因模型中。神经元损伤,如能量损失和/或氧化应激导致细胞cofilin池在其组装成杆状包涵体之前迅速去磷酸化。尽管这些事件暗示了磷酸酶在cofilin棒形成中的作用,但连接能量应激、phosphocofilin周转和随后的棒组装的机制尚不明确。在这里,我们证明了atp敏感的cofilin磷酸酶Chronophin (CIN)与伴侣Hsp90相互作用,形成一个生物传感器,介导cofilin/actin棒的形成。我们的研究结果表明,在ATP耗竭过程中,CIN和Hsp90之间的相互作用减弱,增强了CIN依赖的cofilin去磷酸化和随后的杆组装,从而为神经退行性能量流期间病理性肌动蛋白/cofilin聚集体的形成提供了一种机制。
Actin and its key regulatory component cofilin are found together in large rod-shaped assemblies in neurons subjected to energy stress. Such inclusions are also enriched in Alzheimer’s disease brain, and appear in transgenic models of neurodegeneration. Neuronal insults such as energy loss and/or oxidative stress result in rapid dephosphorylation of the cellular cofilin pool prior to its assembly into rod-shaped inclusions. Although these events implicate a role for phosphatases in cofilin rod formation, a mechanism linking energy stress, phosphocofilin turnover and subsequent rod assembly has been elusive. Here, we demonstrate the ATP-sensitive interaction of the cofilin phosphatase Chronophin (CIN) with the chaperone Hsp90 to form a biosensor that mediates cofilin/actin rod formation. Our results suggest a model whereby attenuated interactions between CIN and Hsp90 during ATP depletion enhance CIN-dependent cofilin dephosphorylation and consequent rod assembly, thereby providing a mechanism for the formation of pathological actin/cofilin aggregates during neurodegenerative energy flux.
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