SIGNIFICANCE OF THE EQUATORIAL SEGMENT OF THE ACROSOME OF THE SPERMATOZOON IN EUTHERIAN MAMMALS
SIGNIFICANCE OF THE EQUATORIAL SEGMENT OF THE ACROSOME OF THE SPERMATOZOON IN EUTHERIAN MAMMALS
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DOI：
10.1016/0014-4827(79)90341-0
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发表时间：
1979-01-01
影响因子：
3.7
通讯作者：
FRANKLIN, LE
中科院分区：
文献类型：
--
作者：
BEDFORD, JM;MOORE, HDM;FRANKLIN, LE
真兽类精子的顶体以赤道后段为特征，它被排除在顶体反应的膜融合事件之外，在精子与卵子结合的过程中明显保持完整。反应的真核精子头部的极限膜，即顶体内膜和顶体后质膜，大部分是稳定的，两者直接被S-S交联型核周物质覆盖。赤道段膜的组织和性质为五层膜和惰性膜。这似乎是精子/卵子融合的初始位置。顶体的赤道部分显然起到了保存覆盖在顶体上的不稳定质膜的离散区域的作用，通过该区域与卵子融合。简要讨论了这一特征的必要性以及其仅限于真兽类精子的可能原因。
The acrosome of the spermatozoon in eutherian mammals is characterized by a posterior equatorial segment which is excluded from the membrane fusion events of the acrosome reaction and apparently remains intact during incorporation of the spermatozoon into the egg. Most of the limiting membrane of the reacted eutherian sperm head, i.e. the inner membrane of the acrosome and post-acrosomal plasmalemma, both of which are underlain immediately by -S-S- crosslinked perinuclear material is stable. The organization and character of the equatorial segment membrane are pentalaminar and inert. This appears to be the initial site of the sperm/egg fusion. The equatorial segment of the acrosome apparently functions to preserve a discrete region of labile plasmalemma overlying it through which fusion with the egg is achieved. The need for this feature and possible reasons for its restriction to the spermatozoa of eutherian mammals are discussed briefly.