TMEM16A通过确保中等水平的酶3活性来调节卫星细胞介导的骨肌肉再生

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Zhiyuan Sun¹, Xinqi Shan¹, Chun'e Fan¹

¹The Jiangsu Key Laboratory for Molecular and Medical Biotechnology, School of Life Sciences, Nanjing Normal University, Nanjing 210023, People's Republic of China.

Stem cells (Dayton, Ohio)

|August 4, 2024

概括

TMEM16A调节酶3的活性,这对于骨肌肉再生至关重要. 在卫星细胞中删除TMEM16A会通过增加ER应力和caspase 3活性来损害肌肉修复,阻碍再生.

科学领域:

细胞生物学细胞生物学
肌肉生理学肌肉生理学
分子医学是分子医学.

背景情况:

酶3活性对于骨肌肉再生至关重要.
在这个过程中,对酶3活性的调节在很大程度上仍未得到阐明.
细胞内TMEM16A (激活化通道) 曾经被证明可以调节神经细胞中的caspase 3.

研究的目的:

研究TMEM16A在卫星细胞 (SC) 介导的骨肌肉再生中的作用.
确定TMEM16A删除如何影响SCs中的caspase 3活性和内质网膜 (ER) 应激.
确定TMEM16A对肌体分化和肌肉修复能力的影响.

主要方法:

一个小鼠模型的生成与SC特定的TMEM16A.删除.
对突变小鼠骨肌肉再生能力的评估.
在Tmem16a-/- SC衍生的髓细胞中分析caspase 3活性和ER压力标志物.
药理学阻断ER压力和caspase3活性,以评估救援对肌体差异化的影响.

主要成果:

具有SC特异性TMEM16A缺失的小鼠表现出骨肌肉再生受损.
在Tmem16a-/- SC衍生的髓细胞中,ER应激增强和卡斯帕酶3活性升高.
阻断ER应激或酶3活性部分恢复了Tmem16a-/- SCs.中的肌原分化.
在这种情况下,ER压力被确定为caspase 3活动的上游调节者.

结论:

TMEM16A在卫星细胞介导的骨肌肉再生中发挥着至关重要的作用.
TMEM16A确保了中度的酶3活性,防止肌肉修复的损害.
TMEM16A的调节失调导致ER压力增加和过度的caspase 3活性,导致肌肉再生缺陷.

关键词:

压力ERER压力ERER压力在TEMEM16A中使用.在Caspase 3阶段.肌肉再生肌肉再生卫星细胞卫星细胞卫星细胞.

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