衰老会影响哺乳动物中央时钟中的GABAergic功能和平衡
Anneke H O Olde Engberink1, Pablo de Torres Gutiérrez1, Anna Chiosso1
1Laboratory for Neurophysiology, Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, Netherlands.
Frontiers in neuroscience
|June 1, 2023
概括
衰老会破坏大脑的中心昼夜时钟,即上核 (SCN),通过改变激发/抑制 (E/I) 平衡. 这导致神经元同步减少,老哺乳动物的生物节奏较弱.
科学领域:
- 神经科学是一个神经科学.
- 时间生物学 时间生物学
- 衰老研究研究 衰老研究
背景情况:
- 衰老会损害上神核 (SCN),这是哺乳动物的中央昼夜钟.
- 这种损伤减少了SCN的输出信号,削弱了生理节奏,如睡眠和清醒周期.
- 降低SCN信号幅度与SCN神经元之间的同步性降低有关.
研究的目的:
- 研究激发/抑制 (E/I) 平衡在SCN神经元同步中的作用.
- 测试E/I平衡的变化有助于与年龄相关的SCN功能障碍的假设.
主要方法:
- (Ca2+) 成像用于研究年轻和老老小鼠的SCN切片.
- 分析了对GABA刺激的反应中Ca2+过渡的极性.
- 在SCN神经元中测量了基线细胞内Ca2+度.
主要成果:
- 与年轻对照人相比,老年SCN神经元的GABAergic刺激和整体E/I平衡更高.
- 老年SCN神经元表现出基线细胞内Ca2+水平升高,表明Ca2+稳态改变.
- 这些发现表明,E/I平衡的转变以及老年SCN的Ca2+调节受损.
结论:
- 在SCN神经元中,GABAergic功能和Ca2+恒温的变化可能是随着衰老而改变网络同步的基础.
- 这项研究确定了潜在的机制,有助于衰老期间昼夜节律的下降.
- 了解这些与年龄相关的SCN变化对于解决老年人群中昼夜干扰至关重要.
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