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胃内膜肌纤维类型和线粒体变化与周围动脉疾病严重程度相关

Kate Kosmac¹, Rena Dana Wang², Jada Stewart³

¹College of Allied Health Sciences, Department of Physical Therapy, Augusta University, Augusta, GA, 30912, USA.

Function (Oxford, England)

|October 6, 2025

概括

周围动脉疾病 (PAD) 的肌肉适应涉及1型肌纤维的增加,这可能是对缺血-再输液损伤的补偿机制. 这可能有助于维持肌肉功能,尽管疾病的严重程度.

科学领域:

肌肉生理学肌肉生理学
血管生物学血管生物学
病理学病理学病理学

背景情况:

周围动脉疾病 (PAD) 导致由于下肢肌肉缺血-反损伤而导致行走障碍.
PAD的个体变化表明肌肉适应能力的差异.
胃半关节肌肉活检显示PAD患者的肌纤维类型分布多样化.

研究的目的:

调查肌纤维类型分布和PAD严重程度之间的关系.
探索潜在的肌肉适应机制,以应对PAD.
为了确定肌肉损伤和适应PAD的指标.

主要方法:

分析了113名患有PAD的个体的胃肌肉活检.
量化肌纤维类型 (例如,1型,2a/x型) 和NCAM+纤维.
评估间肌纤维细胞线粒体 (IMFM) 和肌肉素重链表达.
电子显微镜检查瘤体结构.

主要成果:

观察到1型肌纤维比例 (9.6%-82.6%) 的广泛范围.
较高的1型肌纤维丰度与较低的脚-指数 (PAD严重程度) 相相关.
在1型肌纤维中缺乏间肌纤维线粒体 (IMFM-) 的区域含有myosin 2x和/或LC3,表明向纤维形成和瘤破坏.

结论:

增加1型肌纤维比例可能是PAD中补偿机制,以增强氧化抵抗力.
在1型肌纤维中存在IMFM-区域可能可视化肌纤维过渡或损伤.
肌肉适应性,包括肌纤维类型的变化,在PAD的功能后果中起作用.

关键词:

变质化 (denervation) 是指一个变质化的过程.缺血缺血症是什么意思缺血缺血症线粒体中的线粒体.肌纤维类型的过渡型转型周围动脉疾病是什么这是骨肌肉的骨架肌肉.

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