一个基于actin的粘性塑料锁确保逐渐的车身轴延长
Alicia Lardennois1, Gabriella Pásti2, Teresa Ferraro1
1CNRS UMR7622, Institut de Biologie Paris-Seine (IBPS), Sorbonne Université, Paris, France.
Nature
|August 30, 2019
概括
这项研究揭示了在C. elegans胚胎延长过程中稳定细胞形状的分子网络. 通过调节表皮行为应激纤维,α-光谱SPC-1和PAK-1蛋白质防止轴收缩.
科学领域:
- 发育生物学
- 细胞力学
- 分子生物学
背景情况:
- 身体轴的延长对于动物的发育至关重要,受内在,外在和抵抗力的影响.
- 了解形态发生过程中的机械力量的细胞和分子机制是具有挑战性的.
- 在Caenorhabditis elegans中,胚胎延长涉及肌肉活动和表皮机械传导.
研究的目的:
- 在C. elegans胚胎延长过程中确定稳定细胞形状的分子机制.
- 研究p21激活激酶同类PAK-1及其相互作用伙伴在这个过程中的作用.
主要方法:
- 寻找与PAK-1相互作用的基因和分子相互作用因素.
- 对胚胎轴延长的PAK-1和α-谱SPC-1组合缺失的分析.
- 预测胚胎形状稳定过程的机械建模.
- 对表皮微纤维动态和相关蛋白质的分子分析.
主要成果:
- 在C. elegans胚胎中确定了α-光谱SPC-1作为与PAK-1相互作用的关键因素.
- 由于皮肤上有缺陷的动蛋白应力纤维,PAK- 1和SPC- 1的联合缺失导致了完全的轴收缩.
- 机械建模表明胚胎形状稳定的基础是粘性塑性变形过程.
- 粘性源于肌肉收缩诱导的微纤维缩短,由动蛋白切割蛋白和FHOD-1捆绑介导.
结论:
- 一个涉及PAK-1和SPC-1的分子网络在胚胎延长过程中稳定细胞形状.
- 这种网络起到发育杆的作用,防止轴通过粘性塑料变形而收缩.
- 这些发现阐明了形态发生过程中的机械力调节的细胞基础.
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