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 altho...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(PLCZ1),is localized to the sperm acrosome in mouse and human spermatozoa by immunofluorescence using a specific antibody.Western blot and double staining analyses show NYD-SP27 becomes detached from sperm,as they undergo capacitation and acrosome reaction.The absence of HCO_(3)^(-),a key factor in activating capacitation,from the capacitation-inducing medium prevents the loss of NYD-SP27 from sperm.The anti-NYD-SP27 antibody also prevents the loss of NYD-SP27 from sperm,reduced the number of capacitated sperm,inhibited the acrosome reaction induced by ATP and progesterone,and inhibited agonist-induced PLC-coupled Ca^(2+)mobilization in sperm,which can be mimicked by the PLC inhibitor,U73122.These data strongly suggest that NYD-SP27 is a physiological inhibitor of PLC that acts as an intrinsic decapacitation factor in sperm to prevent premature capacitation and acrosome reaction.展开更多
为了研究睾丸发育特异性蛋白-27基因(testis development specific protein gene 27,NYD-SP27)基因对绵羊精子活率、畸形率及精子内cAMP信号通路中酶类表达量影响,分别将NYD-SP27基因的过表达载体、干扰载体质粒注射到绵羊的睾丸中,通...为了研究睾丸发育特异性蛋白-27基因(testis development specific protein gene 27,NYD-SP27)基因对绵羊精子活率、畸形率及精子内cAMP信号通路中酶类表达量影响,分别将NYD-SP27基因的过表达载体、干扰载体质粒注射到绵羊的睾丸中,通过电刺激采精法采集绵羊精液,对绵羊精子进行染色,检测其活率、畸形率,并通过ELISA方法检测精子中cAMP信号通路中相关酶类的表达量。结果显示:与对照组相比,过表达组精子活率变化不明显,而干扰组有较明显的升高,精子畸形率差异不明显;与过表达组、干扰组绵羊精子中环磷酸腺苷酸的表达量差异极显著(P<0.01);与过表达组绵羊精子中PKA的表达量差异不显著(P>0.05),而干扰组显著升高(P<0.05)。综上所述,干扰NYD-SP27基因对精子中环磷酸腺苷酸和PKA的表达具有调控作用,并对绵羊精子活率具有一定的提高效果。本研究为进一步研究NYD-SP27基因调控绵羊精子发生及获能的分子机制奠定基础。展开更多
基金National 973 Project of China(No.2006CB504002),Chinese National Prominent Youth Foundation(No.30425006)Program for Changjiang Scholars and Innovative Research Team in University(PCSIRT)(No.IRT0631)+1 种基金Research Grants Council(RGC)of Hong Kong(No.CUHK4524/05M)Li Ka Shing Institute of Health Sciences and Focused Investment of the Chinese University of Hong Kong,China.
文摘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(PLCZ1),is localized to the sperm acrosome in mouse and human spermatozoa by immunofluorescence using a specific antibody.Western blot and double staining analyses show NYD-SP27 becomes detached from sperm,as they undergo capacitation and acrosome reaction.The absence of HCO_(3)^(-),a key factor in activating capacitation,from the capacitation-inducing medium prevents the loss of NYD-SP27 from sperm.The anti-NYD-SP27 antibody also prevents the loss of NYD-SP27 from sperm,reduced the number of capacitated sperm,inhibited the acrosome reaction induced by ATP and progesterone,and inhibited agonist-induced PLC-coupled Ca^(2+)mobilization in sperm,which can be mimicked by the PLC inhibitor,U73122.These data strongly suggest that NYD-SP27 is a physiological inhibitor of PLC that acts as an intrinsic decapacitation factor in sperm to prevent premature capacitation and acrosome reaction.
文摘为了研究睾丸发育特异性蛋白-27基因(testis development specific protein gene 27,NYD-SP27)基因对绵羊精子活率、畸形率及精子内cAMP信号通路中酶类表达量影响,分别将NYD-SP27基因的过表达载体、干扰载体质粒注射到绵羊的睾丸中,通过电刺激采精法采集绵羊精液,对绵羊精子进行染色,检测其活率、畸形率,并通过ELISA方法检测精子中cAMP信号通路中相关酶类的表达量。结果显示:与对照组相比,过表达组精子活率变化不明显,而干扰组有较明显的升高,精子畸形率差异不明显;与过表达组、干扰组绵羊精子中环磷酸腺苷酸的表达量差异极显著(P<0.01);与过表达组绵羊精子中PKA的表达量差异不显著(P>0.05),而干扰组显著升高(P<0.05)。综上所述,干扰NYD-SP27基因对精子中环磷酸腺苷酸和PKA的表达具有调控作用,并对绵羊精子活率具有一定的提高效果。本研究为进一步研究NYD-SP27基因调控绵羊精子发生及获能的分子机制奠定基础。
