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Techniques for Imaging Ca2+ Signaling in Human Sperm

Techniques for Imaging Ca2+ Signaling in Human Sperm

Published on: June 17, 2010

精子细胞的全细胞补丁测量显示了性激活的Ca2+通道

Yuriy Kirichok¹, Betsy Navarro, David E Clapham

¹Howard Hughes Medical Institute, Department of Cardiology, Children's Hospital and Harvard Medical School Enders 1309, Boston, Massachusetts 02115, USA.

|February 10, 2006

概括

精子过度激活,对于受精至关重要,是由一个CatSper1通道驱动的. 细胞内化增强了这种通道,增加了和精子的运动性,以实现成功的繁殖.

科学领域:

生殖生物学生殖生物学
离子通道生理学离子通道生理学
精子流动性的动力学

背景情况:

精子的运动性对于受精至关重要,需要一种叫做过度激活的过程,其特点是强烈的尾巴跳动.
过度活化取决于精子鞭毛中的细胞内的增加,这可能是由血膜离子通道介导的.
研究精子离子通道一直是具有挑战性的,因为测量跨膜离子电流的困难.

研究的目的:

描述负责精子过度激活的离子通道.
为了确定参与调节精子运动期间流入的特定离子通道.

主要方法:

开发了一种简化的补丁技术,用于测量整个精子动物的电流.
哺乳动物精子中的鞭状电流的特征.
对缺乏CatSper1蛋白质的精子进行分析.

主要成果:

通过细胞内化强化的一种构成性活跃的鞭状通道的识别.
在缺少CatSper1蛋白质的精子中,这种电流不存在.
CatSper1,一个位于精子尾部的六个跨膜蛋白质,对于过度激活和男性生育能力至关重要.

结论:

CatSper1是鞭状通道的关键组成部分,对于精子过度激活是必要的.
细胞内化增强了CatSper电流,增加了细胞内和诱导过度激活.
CatSper1通过调节精子功能,对男性生育能力至关重要.

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