实用医学杂志 ›› 2025, Vol. 41 ›› Issue (23): 3638-3644.doi: 10.3969/j.issn.1006-5725.2025.23.002

• 专题报道:骨肌疾病 • 上一篇    

抗阻运动调节Piezo1对老年小鼠骨骼肌成肌细胞的影响

林榕,刘刚()   

  1. 南方医科大学南方医院康复理疗科 (广东 广州 510515 )
  • 收稿日期:2025-07-25 出版日期:2025-12-10 发布日期:2025-12-18
  • 通讯作者: 刘刚 E-mail:lg2781@smu.edu.cn
  • 基金资助:
    国家自然科学基金项目(82274619);国家自然科学基金项目(82302846);广东省自然科学基金项目(2024A1515012122)

The effect of resistance exercise regulation of Piezo1 on myoblasts in skeletal muscles in elderly mice

Rong LIN,Gang. LIU()   

  1. Department of Rehabilitation Medicine,Nanfang Hospital,Southern Medical University,Guangzhou 510515,Guangdong,China
  • Received:2025-07-25 Online:2025-12-10 Published:2025-12-18
  • Contact: Gang. LIU E-mail:lg2781@smu.edu.cn

摘要:

目的 探讨抗阻运动调节Piezo1对老年小鼠骨骼肌成肌细胞的影响。 方法 动物实验取30只20月龄雄性C57BL/6老年小鼠随机分为衰老对照组、衰老+运动组和衰老+运动+抑制剂组,10只3月龄小鼠作为年轻对照组。衰老+运动组进行8周抗阻运动,衰老+运动+抑制剂组进行8周抗阻运动同时腹腔注射GsMTx4。采用抓力测试和转棒实验检测运动能力,苏木精-伊红染色检测骨骼肌横截面积,天狼星红染色检测骨骼肌纤维化程度,免疫组化实验检测骨骼肌中p16的表达情况。细胞实验用D-gal和Dex诱导成肌细胞衰老和肌萎缩后,加入Yoda1激活Piezo1,采用SA-β-Gal染色观察细胞衰老情况,蛋白免疫印法检测衰老标志物p16、p21和肌萎缩标志物Atrogin-1、MuRF1的蛋白表达水平,细胞免疫荧光染色检测p21的表达情况。 结果 (1)抗阻运动显著改善老年小鼠运动功能,增加骨骼肌横截面积,减少纤维化及p16阳性细胞率(P < 0.05),效应可被Piezo1抑制剂逆转(P < 0.05);(2)细胞实验中激活Piezo1能减少成肌细胞SA-β-Gal阳性细胞率、衰老标志分子p16、p21和肌萎缩标志分子Atrogin-1、MuRF1的表达量、p21平均荧光强度(P < 0.05)。 结论 抗阻运动通过激活Piezo1抑制成肌细胞衰老,改善老年性肌萎缩。

关键词: 老年性肌萎缩, 抗阻运动, Piezo1, 衰老, 骨骼肌

Abstract:

Objective To investigate the regulatory effects of resistance exercise on Piezo1 in myoblasts within skeletal muscles of aged mice. Methods In animal experiments, thirty 20-month-old male C57BL/6 mice were randomly assigned to one of three groups: an aging control group, an aging exercise group, and an aging exercise inhibitor group. Additionally, ten 3-month-old young mice served as a young control group. The aging exercise group underwent 8 weeks of resistance exercise training, whereas the aging exercise inhibitor group received both 8 weeks of resistance exercise and intraperitoneal injections of GsMTx4. Exercise capacity was evaluated using grip strength tests and rotarod performance assays. Skeletal muscle cross-sectional area was assessed via hematoxylin-eosin staining, fibrosis was examined using Sirius red staining, and the proportion of p16-positive cells was determined by immunohistochemistry. In cellular experiments, senescence in myoblasts was induced with D-galactose (D-gal), followed by activation of Piezo1 using Yoda1. The percentage of senescent cells was measured by SA-β-Gal staining, while protein expression levels of senescence markers (p16 and p21) and atrophy markers (Atrogin-1 and MuRF1) were quantified by Western blot analysis. Cell immunofluorescence staining was employed to assess the average fluorescence intensity of p21. Results (1)Compared with the aging control group, the aging + exercise group exhibited significant improvements in exercise capacity, quadriceps femoris mass index, skeletal muscle cross-sectional area, reduction in skeletal muscle fibrosis, and a lower p16-positive cell percentage (P < 0.05); (2)These beneficial effects of exercise on aged skeletal muscle were attenuated following treatment with a Piezo1 inhibitor (P < 0.05); (3)In vitro experiments demonstrated that activation of Piezo1 reduced the SA-β-Gal positive cell rate in myoblasts, downregulated the expression of senescence markers (p16 and p21) and atrophy-related markers (Atrogin-1 and MuRF1), and decreased the average fluorescence intensity of p21 (P < 0.05). Conclusion Resistance exercise suppresses myocyte aging through activation of Piezo1, thereby ameliorating age-related muscle atrophy in the elderly.

Key words: annual muscular atrophy, resistance exercise, Piezo1, aging, skeletal muscles

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