The clock regulator Bmal1 protects against muscular dystrophy.

The clock regulator Bmal1 protects against muscular dystrophy.
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DOI:
10.1016/j.yexcr.2020.112348
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发表时间:
2020-12-01
影响因子:
3.7
通讯作者:
Ma, Ke
Ma, Ke
中科院分区:
医学3区
文献类型:
--
作者:
Gao, Hongbo;Xiong, Xuekai;Lin, Yayu;Chatterjee, Somik;Ma, Ke

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肌肉内在的时钟机制是维持肌肉生长、重塑和功能所必需的。我们之前的研究表明,分子时钟反馈环路的重要转录激活剂脑和肌肉Arnt-Like 1(Bmal1)在肌源性祖细胞行为中发挥着关键作用,以促进和再生肌发生。在 DMDmdx (mdx) 营养不良小鼠模型中使用针对 Bmal1 的遗传方法,我们在此报告,Bmall 功能的丧失显着加速了营养不良性疾病的进展。与 mdx 小鼠的轻度营养不良变化相反,Bmal1 的基因功能丧失加剧了这种营养不良疾病背景下的肌肉损伤,肌酸激酶水平持续升高、损伤面积增加和肌肉握力降低表明了这一点。机制研究表明,显着受损的肌源性祖细胞增殖和肌源性反应是慢性营养不良环境中新肌纤维形成缺陷的基础。总而言之,我们的研究确定了促肌时钟基因 Bmal1 在防止营养不良性损伤中的功能,表明增强 Bmal1 功能以改善营养不良或退行性肌肉疾病的潜力。
The muscle-intrinsic clock machinery is required for the maintenance of muscle growth, remodeling and function. Our previous studies demonstrated that the essential transcription activator of the molecular clock feed-back loop, Brain and Muscle Arnt-Like 1(Bmal1), plays a critical role in myogenic progenitor behavior to promote and regenerative myogenesis. Using genetic approaches targeting Bmal1 in the DMDmdx (mdx) dystrophic mouse model, here we report that the loss of Bmall function significantly accelerated dystrophic disease progression. In contrast to the mild dystrophic changes in mdx mice, the genetic loss-of-function of Bmal1 aggravated muscle damage in this dystrophic disease background, as indicated by persistently elevated creatine kinase levels, increased injury area and reduced muscle grip strength. Mechanistic studies revealed that markedly impaired myogenic progenitor proliferation and myogenic response underlie the defective new myofiber formation in the chronic dystrophic milieu. Taken together, our study identified the function of pro-myogenic clock gene Bmal1 in protecting against dystrophic damage, suggesting the potential for augmenting Bmal1 function to ameliorate dystrophic or degenerative muscle diseases.
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