Evidence for a secretory pathway Ca2+-ATPase in sea urchin spermatozoa

被引：22
作者：
Gunaratne, Herath Jayantha [1 ]
Vacquier, Victor D. [1 ]
机构：
[1] Univ Calif San Diego, Scripps Inst Oceanog, Ctr Marine Biotechnol & Biomed, La Jolla, CA 92093 USA
来源：
FEBS LETTERS | 2006年 / 580卷 / 16期
关键词：
bisphenol; intracellular calcium; invertebrate fertilization; PMCA; SPCA;
D O I：
10.1016/j.febslet.2006.06.019
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Plasma membrane, sarco-endoplasmic reticulum and secretory pathway Ca2+-ATPases (designated PMCA, SERCA and SPCA) regulate intracellular Ca2+ in animal cells. The presence of PMCA, and the absence of SERCA, in sea urchin sperm is known. By using inhibitors of Ca2+-ATPases, we now show the presence of SPCA and Ca2+ store in sea urchin sperm, which refills by SPCA-type pumps. Immunofluorescence shows SPCA localizes to the mitochondrion. Ca2+ measurements reveal that similar to 75% of Ca2+ extrusion is by Ca2+ ATPases and 25% by Na+ dependent Ca2+ exchanger/s. Bisphenol, a Ca2+ ATPase inhibitor, completely blocks the acrosome reaction, indicating the importance of Ca+-ATPases in fertilization. (c) 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：3900 / 3904
页数：5
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