酸暴露会损害骨肌肉功能和Ca2+信号传递:对杜氏肌肉衰竭病理学的影响
Thomas A Lea1, Peter M Panizza1, Peter G Arthur2
1School of Human Sciences, University of Western Australia, Perth, Western Australia, Australia.
The Journal of physiology
|October 21, 2023
概括
低酸 (HOCl) 损害了杜申肌肉发育不良 (DMD) 的骨肌肉功能和信号传递. 这种反应性氧化剂在衰变肌肉中升高,可能会将炎症和氧化应激联系起来,为DMD提供潜在的治疗点.
科学领域:
- 肌肉生理学 肌肉生理学
- 氧化压力生物学 氧化压力生物学
- 分子医学是分子医学.
背景情况:
- 杜氏肌肉发育不良 (DMD) 涉及肌肉消耗,炎症,氧化应激和 (Ca2+) 信号受损.
- 低酸 (HOCl) 是一种反应性氧化剂,由中性粒细胞通过骨髓氧化酶产生,在肌肌肉中升高.
- HOCl可能会氧化Ca2+处理蛋白,导致DMD病理.
研究的目的:
- 为了研究HOCl对骨肌肉功能的影响.
- 确定HOCl在DMD病理学中的潜在作用.
- 为了阐明HOCl诱导的肌肉功能障碍的机制.
主要方法:
- 从野生型和mdx (变质) 类小鼠手术分离延伸长肌 (EDL),肌底和骨间肌肉.
- 测量ex vivo力产生和细胞内Ca2+度.
- 应用HOCl和药理学药剂 (二二甲醇,四甲,Gd3+,链杆菌素).
主要成果:
- HOCl (200μM) 显著降低了EDL肌肉的最大力,增加了EDL肌肉的静止张力.
- 与快速动EDL相比,HOCl对力量的影响在缓慢动的单体中不那么明显.
- HOCl (10μM) 增加了静止细胞内Ca2+并降低了单个肌纤维中的Ca2+短暂幅度,涉及氨酸受体和TRP通道.
结论:
- HOCl对肌功能产生强烈影响,可能是通过氧化Ca2+信号蛋白.
- 在DMD中,HOCl可能弥合了炎症,氧化应激和Ca2+处理受损之间的差距.
- 向HOCl生产为杜氏肌肉发育不良症提供了一个潜在的治疗策略.
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