Department of Biology, Baylor University, B.207 Baylor Science Building, One Bear Place #97388, Waco, TX, 76798-7388, USA.
Department of Surgery and Perioperative Care, University of Texas, Austin, TX, USA.
Sci Rep. 2024 Jun 1;14(1):12609. doi: 10.1038/s41598-024-63626-3.
Peripheral artery disease (PAD) is characterized by varying severity of arterial stenosis, exercise induced claudication, malperfused tissue precluding normal healing and skeletal muscle dysfunction. Revascularization interventions improve circulation, but post-reperfusion changes within the skeletal muscle are not well characterized. This study investigates if revascularization enhanced hemodynamics increases walking performance with concurrent improvement of mitochondrial function and reverses abnormal skeletal muscle morphological features that develop with PAD. Fifty-eight patients completed walking performance testing and muscle biopsy before and 6 months after revascularization procedures. Muscle fiber morphology, desmin structure, and mitochondria respiration assessments before and after the revascularization were evaluated. Revascularization improved limb hemodynamics, walking function, and muscle morphology. Qualitatively not all participants recovered normal structural architecture of desmin in the myopathic myofibers after revascularization. Heterogenous responses in the recovery of desmin structure following revascularization may be caused by other underlying factors not reversed with hemodynamic improvements. Revascularization interventions clinically improve patient walking ability and can reverse the multiple subcellular functional and structural abnormalities in muscle cells. Further study is needed to characterize desmin structural remodeling with improvements in skeletal muscle morphology and function.
外周动脉疾病(PAD)的特征是动脉狭窄程度不同、运动引起的跛行、组织灌注不良导致无法正常愈合和骨骼肌功能障碍。血管再通干预措施可以改善循环,但骨骼肌内的再灌注后变化尚不清楚。本研究旨在探讨血管再通增强血液动力学是否能提高步行能力,同时改善线粒体功能,并逆转 PAD 发展过程中出现的异常骨骼肌形态特征。58 例患者在血管再通术前和术后 6 个月完成了步行能力测试和肌肉活检。评估了血管再通前后肌肉纤维形态、结蛋白结构和线粒体呼吸功能。血管再通改善了肢体血液动力学、步行功能和肌肉形态。定性地说,并不是所有患者的肌病肌纤维中的结蛋白结构在血管再通后都恢复正常。血管再通后结蛋白结构恢复的异质性反应可能是由其他未通过血液动力学改善逆转的潜在因素引起的。血管再通干预措施在临床上可改善患者的步行能力,并可逆转肌肉细胞中多种亚细胞功能和结构异常。需要进一步研究以确定骨骼肌形态和功能改善与结蛋白结构重塑的关系。