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Presynaptically Silent Synapses Studied with Light Microscopy
Published on: January 5, 2010
普列尼林对于调节神经递质释放至关重要
Chen Zhang1, Bei Wu, Vassilios Beglopoulos
1Center for Neurologic Diseases, Brigham & Women's Hospital, Program in Neuroscience, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|July 31, 2009
概括
前列尼林基因突变导致家族性阿尔茨海默病. 这项研究表明,前素对前神经突触功能至关重要,影响神经递质释放和突触可塑性,这表明阿尔茨海默病的发病过程中早期的前神经突触功能障碍.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- presenilin 基因的突变是家族性阿尔茨海默病 (AD) 的主要原因.
- 前列尼林功能障碍与AD病变发生过程中的突触功能受损有关.
- 在阿尔茨海默病中,突触功能障碍的具体作用和位置尚不清楚.
研究的目的:
- 为了研究表素在突触功能中的精确作用.
- 为了确定是否Presenilin功能障碍会影响前突触或后突触神经元.
- 阐明表尼林影响突触可塑性和神经递质释放的机制.
主要方法:
- 在小鼠模型中,在特定的神经元群体中 (前突触CA3与后突触CA1) 条件遗传失活化前林.
- 电生理学记录以评估长期潜能 (LTP) 和短期可塑性.
- 使用MK-801测量谷氨酸释放概率.
- 药理学操纵内质网膜中的Ca2+) 储量.
主要成果:
- 前突触性,但不是后突触性,前林的删除减少了theta-burst诱导的LTP.
- 普雷西林的前突触失活改变了短期的可塑性和突触促进.
- 预突触的普西尼林失活降低了诱发谷氨酸释放的概率.
- 干扰内分泌网膜Ca(2+) 信号传递模仿并掩盖了前突触性表林失活的效应.
结论:
- 普列尼林在神经递质释放和LTP诱导的活性依赖调节中起有选择性的作用.
- 普列尼林调节了前突触终端中的细胞内Ca2+) 释放.
- 由 presenilin 损失介导的前突触功能障碍可能是阿尔茨海默氏症神经退行症的早期事件.
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