Ephexin1 is required for structural maturation and neurotransmission at the neuromuscular junction.

Ephexin1 is required for structural maturation and neurotransmission at the neuromuscular junction.
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DOI:
10.1016/j.neuron.2010.01.012
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发表时间:
2010-01-28
期刊:
影响因子:
16.2
通讯作者:
Ip NY
Ip NY
中科院分区:
医学1区
文献类型:
--
作者:
Shi L;Butt B;Ip FC;Dai Y;Jiang L;Yung WH;Greenberg ME;Fu AK;Ip NY

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神经肌肉接头(NMJ)的成熟需要含有突触后乙酰胆碱受体(AChR)的结构从简单的斑块到由椒盐卷饼状分支组成的复杂结构的拓扑转换。这一成熟过程导致突触前特化和突触后特化的精确对应。然而,对AChR簇从斑块到椒盐卷饼转变的分子机制知之甚少。在这项研究中,我们确定了Rhogenphexin1在AChR簇成熟过程中的重要作用。成年−/−小鼠表现出严重的肌肉无力和突触传递障碍。有趣的是,当Ephexin1在体内表达不足时,NMJ无法分化为椒盐卷饼状,这种异常可以通过重新表达Ephexin1来挽救。我们进一步证明了Ephexin1以RhoA依赖的方式调节AChR簇的稳定性。综上所述,我们的发现揭示了Ephexin1在调节NMJ的结构成熟和神经传递方面不可或缺的作用。
The maturation of neuromuscular junctions (NMJs) requires the topological transformation of postsynaptic acetylcholine receptor (AChR)-containing structures from a simple plaque to an elaborate structure composed of pretzel-like branches. This maturation process results in the precise apposition of the pre- and postsynaptic specializations. However, little is known about the molecular mechanisms underlying the plaque-to-pretzel transition of AChR clusters. In this study, we identify an essential role for the RhoGEF ephexin1 in the maturation of AChR clusters. Adult ephexin1−/− mice exhibit severe muscle weakness and impaired synaptic transmission at the NMJ. Intriguingly, when ephexin1 expression is deficient in vivo, the NMJ fails to differentiate into the pretzel-like shape, and such abnormalities can be rescued by re-expression of ephexin1. We further demonstrate that ephexin1 regulates the stability of AChR clusters in a RhoA-dependent manner. Taken together, our findings reveal an indispensible role for ephexin1 in regulating the structural maturation and neurotransmission of NMJs.
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