Altering the speract-induced ion permeability changes that generate flagellar Ca2+ spikes regulates their kinetics and sea urchin sperm motility.

Altering the speract-induced ion permeability changes that generate flagellar Ca2+ spikes regulates their kinetics and sea urchin sperm motility.
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改变精子引起的离子渗透性变化,产生鞭毛 Ca2 尖峰,调节其动力学和海胆精子活力。

DOI:
10.1016/j.ydbio.2007.03.036
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发表时间:
2007
影响因子:
2.7
通讯作者:
A. Darszon
A. Darszon
中科院分区:
生物学3区
文献类型:
--
作者:
C. Wood;T. Nishigaki;Y. Tatsu;N. Yumoto;S. Baba;M. Whitaker;A. Darszon

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Speract 是一种源自卵子的精子激活肽,可诱导海胆 Strongylocentrotus purpuratus 精子的细胞内 Ca2+、Na+、pH、cAMP、cGMP 和膜电位发生变化。 Ca2+ 是所有精子活力的关键调节剂,在许多海洋物种中,Ca2+ 是产生散布着更直游泳路径的转弯所必需的,这对于卵子的趋化性至关重要。我们表明,speract 会触发鞭毛 Ca2+ 的一系列增加,并且每个单独的 Ca2+ 波动都会引起鞭毛不对称性的短暂增加,从而导致转向。我们还发现,通过用尼氟酸(一种 Ca2+ 激活的 Cl−通道抑制剂)处理精子来改变单个 Ca2+ 波动的幅度、持续时间和间隔,相应地改变了精子转动的特性。我们得出的结论是,Ca2+通过快速鞭毛途径进入不仅诱导精子转向,而且Ca2+进入的动力学可能塑造这些转向的性质,并且这些动力学通过其他通道(可能包括Cl−通道)调节。此外,speract 引起的精子活力变化与其他海洋生物趋化过程中所见的变化非常相似,但 speract 不是化学引诱剂。这意味着 Ca2+ 诱导的运动变化对于趋化性是必要的,但还不够。
Speract, an egg-derived sperm-activating peptide, induces changes in intracellular Ca2+, Na+, pH, cAMP, cGMP, and membrane potential in sperm of the sea urchin Strongylocentrotus purpuratus. Ca2+is a key regulator of motility in all sperm and, in many marine species, is required for generating turns interspersed with straighter swimming paths that are essential for chemotaxis towards the egg. We show that speract triggers a train of increases in flagellar Ca2+, and that each individual Ca2+fluctuation induces a transient increase in flagellar asymmetry that leads to a turn. We also find that modifying the amplitude, duration and interval between individual Ca2+fluctuations by treating sperm with niflumic acid, an inhibitor of Ca2+-activated Cl−channels, correspondingly alters the properties of the sperm turns. We conclude that Ca2+entry through a fast flagellar pathway not only induces sperm turns, but the kinetics of Ca2+entry may shape the nature of these turns, and that these kinetics are tuned by other channels, possibly including Cl−channels. In addition, the speract-induced changes in sperm motility closely resemble those seen during chemotaxis in other marine organisms, yet speract is not a chemoattractant. This implies the Ca2+-induced motility changes are necessary but not sufficient for chemotaxis.
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发表时间: 2005-08-19
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DOI: --
发表时间: 1984
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DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
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