The SLO3 sperm-specific potassium channel plays a vital role in male fertility.

The SLO3 sperm-specific potassium channel plays a vital role in male fertility.
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DOI:
10.1016/j.febslet.2010.02.005
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发表时间:
2010-03-05
期刊:
影响因子:
3.5
通讯作者:
Salkoff L
Salkoff L
中科院分区:
生物学3区
文献类型:
--
作者:
Santi CM;Martínez-López P;de la Vega-Beltrán JL;Butler A;Alisio A;Darszon A;Salkoff L

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在这里,我们展示了一个独特的男性不育的例子,由基因敲除的精子特异性,pH值依赖性SLO 3钾通道。与在获能过程中经历膜超极化的野生型精子形成鲜明对比,我们发现SLO 3突变体精子经历膜去极化。在获能条件下,SLO 3突变体精子中的几个缺陷是明显的,包括运动性受损、弯曲的“发夹”形状和不能进行顶体反应(AR)。AR的失败被缬氨霉素所挽救,缬氨霉素使突变精子超极化。因此,SLO 3是负责电容诱导的超极化的主要钾通道,并且膜超极化对AR至关重要。
Here we show a unique example of male infertility conferred by a gene knock-out of the sperm-specific, pH-dependent SLO3 potassium channel. In striking contrast to wild-type sperm which undergo membrane hyperpolarization during capacitation, we found that SLO3 mutant sperm undergo membrane depolarization. Several defects in SLO3 mutant sperm are evident under capacitating conditions, including impaired motility, a bent “hairpin” shape, and failure to undergo the acrosome reaction (AR). The failure of AR is rescued by valinomycin which hyperpolarizes mutant sperm. Thus SLO3 is the principal potassium channel responsible for capacitation-induced hyperpolarization, and membrane hyperpolarization is crucial to the AR.
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