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首页> 外文期刊>Cell Reports >XIAP Regulates Caspase Activity in Degenerating Axons
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XIAP Regulates Caspase Activity in Degenerating Axons

机译:XIAP调节变性轴突中的半胱天冬酶活性

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Our knowledge of the destructive events that regulate axonal degeneration is rudimentary. Here, we examine the role of caspases and their endogenous inhibitor, the X-linked inhibitor of apoptosis protein (XIAP), in axonal degeneration of dorsal root ganglion (DRG) axons. We show that caspase-3, caspase-6, and caspase-9 are present in axons and are cleaved upon nerve growth factor (NGF) withdrawal. We observed that caspase-3 activity is high in NGF-withdrawn axons and that CASP3^-^/^- axons are protected from degeneration. XIAP^-^/^- DRG sensory neurons degenerate more rapidly and contain more active caspase-3 than their wild-type counterparts, indicating that axonal caspases are normally regulated by XIAP. Importantly, axonal XIAP levels drop sharply after NGF withdrawal; if XIAP levels are maintained by overexpression, axonal caspase-3 activation and axonal degeneration are suppressed. Finally, we show that XIAP^-^/^- embryos have stunted dermal innervation. We propose that XIAP-mediated caspase inhibition plays an important role in regulating morphogenic events that shape the nervous system during development.
机译:我们对调节轴突变性的破坏性事件的了解是基本的。在这里,我们检查半胱氨酸蛋白酶及其内源性抑制剂,X连锁的凋亡蛋白抑制剂(XIAP)在背根神经节(DRG)轴突的轴突变性中的作用。我们显示轴突中存在caspase-3,caspase-6和caspase-9,并在神经生长因子(NGF)撤离时被裂解。我们观察到在提取NGF的轴突中caspase-3活性高,并且保护了CASP3 ^-^ / ^-轴突免于变性。 XIAP ^-^ / ^-DRG感觉神经元与其野生型对应物相比,退化更快,并含有更多的活性caspase-3,这表明轴突胱天蛋白酶通常受XIAP调节。重要的是,NGF退出后,轴突XIAP水平急剧下降。如果通过过度表达维持XIAP水平,则可抑制轴突caspase-3激活和轴突变性。最后,我们显示XIAP ^-^ / ^-胚胎已发育不良的皮肤神经支配。我们建议,XIAP介导的半胱天冬酶抑制作用在调节形成过程中影响神经系统的形态发生事件中起重要作用。

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