NYD-SP27,一个新的精子内源性去获能因子
Ye Bi;Wen-Ming Xu;Hau Yan Wong;Hui Zhu;Zuo-Min Zhou;Hsiao Chang Chan;Jia-Hao Sha
【期刊名称】《亚洲男性学杂志(英文版)》 【年(卷),期】2009(011)002
【摘要】在受精之前精子必须完成一个被称为\获能\的活化过程,最终发生项体反应.到目前为止,虽然已有研究证实多种来源的去获能因子在这一过程中发挥作用,但对于阻止精子发生过早获能的详细机制还不甚了解.在本文的研究中,我们通过特异性抗体的免疫荧光证实NYD-SP27,磷脂酶C Zeta 1(PLCZl)的一种亚型,定位于小鼠和人精子的顶体部.Western blot和双染的研究表明在精子发生获能和顶体反应的过程中NYD-SP27逐渐从精子上丢失.关键性获能活化因子HCO3的缺乏可以阻止NYD-SP27自精子上的丢失.抗NYD-SP27的抗体也同样能够阻止NYD-SP27自精子上的丢失,减少获能精子的数量,抑制ATP和孕酮诱发的顶体反应以及抑制精子内PLC偶联的Ca2+的动员,而这些均能够由PLC inhibitor u73122所模拟.这些数据有力的表明NYD-SP27是一种生理性的PLC抑制剂,它作为精子内的内源性的去获能因子发挥作用以阻止过早的获能和顶体反应的发生.%Prior to fertilization sperm has to undergo an activation process known as capaciation, leading to the acrosome reaction. Till now, little is known about the mechanism for preventing premature capacitation in sperm although decapacitation factors from various sources have been thought to be involved. In this study, we report that NYD-SP27, an isoform of phospholipase C Zeta 1 (PLCZI), is