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Vgll2作为线粒体功能的整合调节剂和骨肌肉特有的收缩性

Masahiko Honda¹, Ryota Inoue^2,3, Kuniyuki Nishiyama^2,3,4

¹Department of Biochemistry, Kindai University Faculty of Medicine, Osakasayama, Osaka, Japan.

Journal of cellular physiology

|September 17, 2024

概括

骨干状家族成员2 (Vgll2) 通过增强线粒体功能和氧化能力来协调肌肉纤维类型. 这种蛋白质对于骨肌肉的适应至关重要,改善了运动耐力和代谢效率.

科学领域:

肌肉生理学肌肉生理学
线粒体生物学线粒体生物学
适应的分子机制.

背景情况:

骨肌肉适应包括协调收缩和线粒体功能以改变纤维类型.
在纤维过渡期间,将收缩和代谢适应联系起来的分子机制尚不清楚.
骨肌特异性辅助因子Vestigial-like家族成员2 (Vgll2),此前已被确定为快速到缓慢肌肉适应的重要因素.

研究的目的:

研究Vgll2在调节线粒体质量,氧化能力和整体肌肉功能的作用.
阐明Vgll2影响骨肌肉适应的分子机制.
要确定Vgll2对线粒体功能的影响是否独立于其对收缩蛋白的影响.

主要方法:

基因缺陷的小鼠模型
转基因Vgll2在小鼠中的过度表达.
分析肌肉纤维组成,线粒体DNA含量和与线粒体功能和氧化酸化相关的基因/蛋白质表达.
在孤立的肌肉纤维中评估最大呼吸.
评估运动耐力和对耐力训练的代谢反应.

主要成果:

过度表达Vgll2增加了肌肉线粒体质量和氧化能力,促进了缓慢类型的纤维组成,增强了运动耐力.
Vgll2表达与线粒体基因表达,线粒体DNA含量和氧化酸化复合物丰富度正相关.
在耐力训练期间,Vgll2过度表达增加了分离的肌肉纤维的最大呼吸率,并提高了代谢效率,独立于肌重链基因变异.
耐力运动的Vgll2激活调节了参与脂肪酸利用的基因.

结论:

Vgll2是线粒体功能和骨肌肉收缩性的整合调节剂.
Vgll2在增强线粒体生物发生和氧化能力方面发挥着直接作用,独立于收缩性蛋白质修饰.
通过运动激活Vgll2通过脂肪酸代谢的上调促进代谢效率和运动耐力.

关键词:

耐力训练是一种耐力训练.线粒体功能线粒体功能肌肉纤维肌肉纤维肌肉纤维氧化酸化是一种氧化酸化.呼吸系统呼吸系统呼吸系统体重增加体重增加

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