在光滑肌的功能丧失作为肌性缩的模型,与胃肠动性相关的MBNL
Janel A M Peterson1,2, Jesus A Frias1, Andrew N Miller1
1Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX 77030.
概括
肌性失调1型 (DM1) 由于MBNL蛋白质的损失导致胃肠 (GI) 功能障碍,导致光滑肌肉过度活跃. 针对胃肠道收缩活性的疗法可以缓解DM1胃肠道症状.
科学领域:
- 肌肉生理学 肌肉生理学
- RNA生物学的RNA生物学
- 胃肠病学 胃肠病学
背景情况:
- 肌肉性缩症1型 (DM1) 是一种常见的成人发病的肌肉缩症,影响多个器官,包括肠道.
- 胃肠道功能障碍影响到80%的DM1患者,但其潜在的机制,特别是胃肠道功能障碍,尚不清楚.
- DM1的发病包括CTG在DMPK基因中的重复扩张,导致肌肉盲样 (MBNL) 蛋白质的隔离.
研究的目的:
- 调查DM1中胃肠道不运动的肌源性机制.
- 为了模拟DM1相关的胃肠道动性,使用对Mbnl1和Mbnl2.2的条件光滑肌特异性淘汰赛小鼠模型.
主要方法:
- 为Mbnl1和Mbnl2.2开发了一个有条件的,光滑肌特异性的淘汰赛小鼠模型.
- 在体内评估胃肠道过渡,并在体外评估平滑肌肉收缩度.
- 在小鼠和人类的DM1GI光滑肌样本上进行RNA测序.
主要成果:
- 患有Mbnl淘汰赛的小鼠表现出延迟的胃肠道过渡和增加光滑肌肉收缩度.
- 光滑肌肉没有表现出他的病理学,但增加了肌素轻链的酸化 (Mlc20).
- 确定了调节Mlc20酸化和平滑肌肉收缩的转录的保存,错误调节的替代拼接.
结论:
- 麻将会破坏收缩的动态,并导致肠道平滑肌肉过度活跃.
- 这些发现表明,MBNL蛋白对于调节肠道平滑肌功能至关重要.
- 降低胃肠道收缩活性的疗法可能为DM1相关的胃肠道症状提供治疗策略.
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