在小鼠卵细胞生长过程中,SMAD4促进体质-胚芽细胞接触
Sofia Granados-Aparici1,2,3, Qin Yang1, Hugh J Clarke1,4
1Research Institute, McGill University Health Centre, Montreal, Canada.
eLife
|May 31, 2024
概括
转化生长因子-β (TGFβ) 信号调节卵细胞的发育. 颗粒状细胞中SMAD4的减少减少了跨区域突出 (TZPs) 并改变了细胞粘附蛋白,影响了细胞通信.
科学领域:
- 生殖生物学 生殖生物学
- 细胞生物学 细胞生物学
- 发育生物学是发展生物学.
背景情况:
- 哺乳动物卵细胞的发育取决于颗粒细胞接触的营养和信号.
- 跨区域投射 (TZPs) 调解了这一至关重要的细胞间通信.
- 卵细胞衍生TGFβ配体影响TZP形成,但机制尚不清楚.
研究的目的:
- 调查SMAD4的作用,这是TGFβ信号传递的关键媒介,在颗粒细胞中TZP的形成和功能.
- 阐明TGFβ信号如何影响颗粒细胞和卵细胞之间的物理相互作用.
主要方法:
- 在小鼠中利用可诱导的Cre复合酶系统,以消耗SMAD4,特别是在颗粒细胞中.
- 使用三维成像量化TZP数量和形态.
- 评估了关键的跨膜蛋白,N-cadherin和Notch2.2的表达水平.
主要成果:
- 由于SMAD4的耗尽,TZP总数减少了20-50%,新形成的TZP减少了50%.
- 缺少SMAD4的TZP较长,并且更倾向于卵细胞.
- 在SMAD4贫乏的粒状细胞中,N-cadherin和Notch2的表达减少了50%.
结论:
- SMAD4信号对于调节TZP的数量和稳定性至关重要.
- SMAD4调节细胞粘附蛋白 (N-cadherin,Notch2),可以稳定TZP与卵细胞的附着.
- 这一途径在发育过程中放大了粒状细胞和卵细胞之间的信号传输.
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