线虫精子发生过程中的膜流
Membrane flow during nematode spermiogenesis.
作者信息
Roberts T M, Ward S
出版信息
J Cell Biol. 1982 Jan;92(1):113-20. doi: 10.1083/jcb.92.1.113.
Abstract
Two distinct types of surface membrane rearrangement occur during the differentiation of Caenorhabditis elegans spermatids into amoeboid spermatozoa. The first, detected by the behavior of latex beads attached to the surface, is a nondirected, intermittent movement of discrete portions of the membrane. This movement starts when spermatids are stimulated to differentiate and stops when a pseudopod is formed. The second type of movement is a directed, continual flow of membrane components from the tip of the pseudopod to its base. Both membrane glycoproteins and fluorescent phospholipids inserted in the membrane flow backward at the same rate, approximately 4 micrometers/min, although their lateral diffusion coefficients in the membrane differ by at least a factor of 5. These observations suggest that pseudopodial membrane movement is due to bulk flow of membrane components away from the tip of the pseudopod.
摘要
在秀丽隐杆线虫精子细胞分化为变形虫状精子的过程中，会发生两种不同类型的表面膜重排。第一种是通过附着在表面的乳胶珠的行为检测到的，是膜的离散部分的无定向、间歇性运动。这种运动在精子细胞受到刺激开始分化时启动，在伪足形成时停止。第二种运动类型是膜成分从伪足尖端到基部的定向、持续流动。插入膜中的膜糖蛋白和荧光磷脂都以相同的速率向后流动，约为4微米/分钟，尽管它们在膜中的侧向扩散系数相差至少5倍。这些观察结果表明，伪足膜运动是由于膜成分从伪足尖端大量流出所致。
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