通过静止的肌肉细胞增强促进性外体的分泌
Prabhavathy Devan1, Ananga Ghosh1,2, Pallavi Rao T1,2
1CSIR-Centre for Cellular and Molecular Biology, Hyderabad-500007, India.
Frontiers in cell and developmental biology
|August 7, 2024
概括
静止的肌肉干细胞分泌更多的外生体,它们携带独特的信号. 这些外基因组影响肌肉再生和平衡,这表明休息肌肉干细胞的新信号作用.
科学领域:
- 细胞和分子生物学 细胞和分子生物学
- 肌肉再生研究 肌肉再生研究
- 细胞外囊泡生物学 细胞外囊泡生物学
背景情况:
- 骨肌肉的再生依赖于不同状态的肌肉细胞之间的协调信号.
- 分泌的小细胞外囊泡 (sEVs),包括外体,都与细胞间通信有关.
研究的目的:
- 研究肌肉细胞在不同的再生状态下分泌的sEVs/外体的作用和特征.
- 探索从静止 (G0) 肌细胞外体对肌肉再生的功能影响.
主要方法:
- 使用肌肉细胞培养模型,代表不同的再生状态 (静止,重新激活,增殖,分化).
- 分析了sEV分泌,外体标记 (Alix,TSG101,flotillin-1,CD9) 和基布拉表达.
- 净化了SEV并进行了蛋白质组分析.
- 评估了目标细胞对外体的吸收以及对肌体分化和Wnt信号的功能影响.
主要成果:
- G0神经细胞表现出增强的SEV分泌与外体细胞标记物和增加的基布拉表达,外体细胞生物发生的调节者.
- 纯化的外体含有常见的和特定状态的蛋白质;G0衍生外体具有抗氧化剂的特征,并且很容易被肌管内化.
- 来自所有状态的外体激活了Wnt信号,但只有G0衍生的外体诱导了增殖细胞中的肌体差异化.
结论:
- 静止肌肉细胞表现出增加的外体分泌,具有独特的载荷和信号传递能力.
- 来自G0的外体在促进肌原分化方面发挥着重要作用.
- 静止肌肉干细胞在维护肌肉平衡的过程中可能具有被低估的信号功能.
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