状变化先于与年龄相关的食障碍和核模糊性运动神经元死亡
1Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN, USA.
The Journal of physiology
|January 27, 2025
概括
由于运动神经元 (MN) 树突变退化和神经元死亡和肌肉衰弱之前的突触损失,衰老会影响吞 (消化不良). 保护突触可能有助于预防与年龄相关的肉症.
科学领域:
- 神经科学是一个神经科学.
- 老年学是指老年学的学科.
- 生理学 生理学 生理学
背景情况:
- 衰老与消化不良有关,通过吸收增加死亡风险.
- 与年龄相关的消化不良的病理生理学,特别是肌肉衰弱与时刻异常之间的作用,仍然不太了解.
- 运动神经元 (MN) 树突完整性对于协调的神经电路至关重要,其失调在神经退行性疾病中先于神经元死亡.
研究的目的:
- 为了研究树突退化,运动神经元损失和老老鼠的功能缺陷之间的时间关系.
- 确定突触变化是否先于运动神经元死亡和核模两可的运动神经元的行为障碍.
- 为了探索与年龄相关的食障碍的病理生理学,在费舍尔344只老鼠中.
主要方法:
- 在老年老鼠的Fisher 344中使用压力导管来评估喉和隔膜功能,在水球吞期间.
- 量化吞次数和吞后呼吸暂停,以评估呼吸-吞协调.
- 通过对Nissl染色和树突形态 (长度,表面积,脊柱密度) 的立体评估,通过使用Golgi-Cox浸组织的共聚焦成像来评估核模糊运动神经元数量.
主要成果:
- 从18个月起,大鼠的吞协调和吞后呼吸暂停发生变化.
- 吞压力 (表明肌肉软弱) 和核模两可的运动神经元数量在24个月后减少.
- 核模糊运动神经元中的树突长度,表面积和脊柱密度从18个月大开始显著减少.
结论:
- 在老老鼠中,突触损失和核模糊运动神经元中的树突退化先于运动神经元死亡和行为障碍 (失症).
- 这些发现表明,突触保护策略可能有助于改善与年龄相关的肉症和失症.
- 在衰老过程中,吞时的时机和协调缺陷比老化过程中的肌肉虚弱更早出现.
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