多个与自闭症相关的基因通过突触支架PSD-95的蛋白质体降解来调解突触消除
Nien-Pei Tsai1, Julia R Wilkerson, Weirui Guo
1Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Cell
|December 25, 2012
概括
肌细胞增强因子2 (MEF2) 和脆弱X智障蛋白 (FMRP) 通过protocadherin 10 (Pcdh10) 控制突触消除. 这一途径涉及PSD-95降解,并且在FMRP缺乏的神经元中被破坏,突出显示了自闭症基因的作用.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 活动依赖转录因子肌细胞增强因子2 (MEF2) 调节神经元中的刺激性突触消除.
- 与认知功能障碍和自闭症相关的脆弱X智障蛋白 (FMRP) 对这一过程至关重要.
- 自闭症谱系障碍 (ASD) 与影响神经元发育和功能的遗传因素有关.
研究的目的:
- 调查ASD基因protocadherin 10 (Pcdh10) 在MEF2和FMRP介导的突触消除中的作用.
- 阐明 MEF2 诱导的 PSD-95 降解背后的分子机制及其通过 FMRP 的调节.
- 了解FMRP缺乏如何影响突触消除通路.
主要方法:
- 研究了MEF2和FMRP对Pcdh10表达的合作调节.
- 利用无处不在测试来检查PSD-95修饰的Mdm2.
- 研究了Pcdh10与蛋白酶体之间的相互作用.
- 分析了FMRP缺乏对Mdm2活性和PSD-95无化使用EF1α作为调解物的影响.
主要成果:
- Pcdh10对于MEF2诱导的刺激性突触消除是必不可少的.
- MEF2的激活导致PSD-95的Mdm2介导的泛化和蛋白质体降解,这一过程依赖于Pcdh10.
- 在缺乏FMRP的神经元中,高的EF1α隔离Mdm2,抑制PSD-95无处不在和突触消除.
- 阻断Pcdh10-蛋白酶相互作用可以防止MEF2诱导的PSD-95降解和突触消除.
结论:
- MEF2和FMRP协同调节Pcdh10表达,这对于活动依赖的突触消除至关重要.
- 这些发现揭示了涉及Pcdh10,Mdm2和PSD-95在调节突触可塑性的新型机制.
- 这种途径的失调,特别是由于EF1α升高而缺乏FMRP,导致在脆弱X综合征和潜在的其他ASD中观察到的突触异常.
- 多个与自闭症相关的基因在活动依赖的突触消除过程中起着重要作用.
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