机械激活的snai1b协调了肌肉心脏分层的启动,以进行化
Jing Wang1, Aaron L Brown2, Seul-Ki Park3,4
1Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA.
Nature communications
|September 24, 2025
概括
机械力和心肌细胞中的肌体表达驱动心脏动. 这项研究揭示了snai1b阳性细胞通过机械激活和分层,独立于典型的上皮细胞到介质酶体的过渡途径,通过机械激活和分层启动轨道.
科学领域:
- 心血管系统的发展.
- 细胞生物学 细胞生物学
- 分子遗传学 分子遗传学
背景情况:
- 心脏曲线对心脏发育至关重要,由机械力量协调.
- 牛家族的基因,如snai1b,已知具有表皮转移到介质细胞的转变,但它们在心脏轨道运动中的作用尚不清楚.
- 在斑马鱼发育早期的腹腔中,snai1b阳性心肌细胞很少被发现.
研究的目的:
- 为了调查snai1b在启动心脏轨道运动中的作用.
- 了解心脏发育过程中snai1b表达,机械应激和心肌细胞行为之间的关系.
- 为了确定snai1b阳性心肌细胞是否经历了上皮细胞到介质细胞的过渡.
主要方法:
- 使用斑马鱼作为模型生物.
- 采用异二醇治疗来调节心肌细胞活动.
- 使用CRISPR激活和CRISPR抑制来操纵snai1b的表达.
- 进行4D应变分析以评估心肌力学.
- 进行单细胞和空间转录组学来分析基因表达.
主要成果:
- 异二醇治疗增加了snai1b阳性心肌细胞,主要是Notch阴性.
- snai1b的激活促进了轨道积分,而抑制则减少了轨道积分,并诱导了顶端分层.
- 机械应变分析显示了与snai1b表达和Notch-ErbB2信号的对齐.
- 在snai1b阳性心肌细胞中,缺乏典型的上皮细胞到介质细胞过渡标志物,例如Col1a2的产生.
结论:
- 确定了一种独特的snai1b阳性心肌细胞群,对心脏轨道形成至关重要.
- 这些细胞是机械激活的,并通过分层启动化,而不是标准的上皮细胞到介质酶细胞的过渡.
- 表明了涉及牛和机械线索的新曲化机制.
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