Role of phospholipases during sperm acrosomal exocytosis.

Role of phospholipases during sperm acrosomal exocytosis.
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磷脂酶在精子顶体胞吐作用中的作用。

DOI:
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发表时间:
1998
期刊:
Frontiers in Bioscience
影响因子:
--
通讯作者:
E.R.S. Roldan
E.R.S. Roldan
中科院分区:
--
文献类型:
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作者:
E.R.S. Roldan

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在受精过程中,精子经历了一个由卵母细胞相关激动剂引发的受调节的胞吐过程。精子中激动剂-受体相互作用产生的早期反应是激活导致Ca2+内流的机制,该离子对于磷脂酶的激活和质膜与顶体外膜的融合是必不可少的。磷脂酰胆碱特异性磷脂酶C和磷脂酰胆碱特异性磷脂酶C都参与多种二酰基甘油分子种的生成。磷脂酶D,在另一方面,似乎没有贡献(连同磷脂磷脂水解酶)对二酰基甘油的显著生成。磷脂酶A2的作用是释放脂肪酸并产生溶血磷脂,这些溶血磷脂可以直接或作为其他代谢物生成的底物,在膜融合的最后阶段发挥重要作用。未来还需要开展更多的工作来确定哺乳动物精子中存在哪些磷脂酶同工酶以及调节这些酶的机制
During fertilization the spermatozoon undergoes a process of regulated exocytosis triggered by oocyte-associated agonists. An early response generated by agonist-receptor interaction in spermatozoa is the activation of mechanisms leading to Ca2+ influx, this ion being essential for the activation of phospholipases and for the fusion of the plasma membrane with the outer acrosomal membrane. Both a phosphoinositide-specific, and a phosphatidylcholine-specific phospholipase C are involved in the generation of a variety of diacylglycerol molecular species. Phospholipase D, on the other hand, does not seem to contribute (together with a phosphatidate phosphohydrolase) to a significant generation of diacylglycerol. Phospholipase A2 action serves to release fatty acids and to generate lysophospholipids that, either directly or serving as substrates for the generation of other metabolites, have and essential role in the final stages of membrane fusion. Additional work needs to be carried out in the future to characterize which phospholipase isoenzymes are present in mammalian spermatozoa and mechanisms regulating these enzymes
DOI: 10.1002/j.1939-4640.1994.tb00438.x
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