在小脑颗粒细胞神经发生过程中,永久性毛损失涉及毛维护和中心封闭的撤回
Sandii Constable1, Carolyn M Ott2, Andrew L Lemire2
1Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390.
概括
大脑小神经元在发育过程中通过独特的解构过程失去它们的初级毛. 这种永久的眼损失是由维护和中枢点上限的减少驱动的,防止再生和调节Sonic hedgehog信号.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
背景情况:
- 大脑神经元中的初级毛细胞作为Sonic hedgehog (SHH) 等细胞外连接体的信号中心.
- 大脑小粒细胞 (GCs) 中的乳毛在神经元分化过程中经历了一种独特的分解过程,称为乳毛解构.
- 成熟的神经元通常不会再生长乳毛,即使有中心细胞存在.
研究的目的:
- 为了确定基底的分子机制纤维膜解构和中枢点对接在GC神经元.
- 为了将GC分化过程中的分子变化与已知的纤毛吸收机制进行比较.
- 了解成熟神经元中SHH信号的调节和毛的再生.
主要方法:
- 单细胞转录组分析以比较基因表达在原生,分化和成熟的GC中.
- 免疫细胞学分析,以评估蛋白质定位在乳毛和中心细胞.
- 将GC乳毛细解构与先导性乳毛细再吸收机制进行比较.
主要成果:
- 差异化GCs显示,乳毛维护基因的转录减少,包括内运输和中心卫星组件.
- 在分化过程中,乳毛和中心细胞的蛋白质丰度下降.
- 在分化之前,SHH信号被下调,独立于SHH通路激活水平.
- 成熟的GC中的母中心细胞招募了CEP97,一种帽子复合蛋白,这表明了防止和解的机制.
结论:
- 在GCs中,膜解构是通过在分化过程中编程减少膜维持因子来调节的.
- 通过像CEP97这样的蛋白质封闭中心,可以防止成熟神经元中的纤毛再生长.
- 这些机制有助于永久的乳毛损失,并在特定的神经元环境中调节SHH信号传递.
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