Ca2+ Signals Generated by CatSper and Ca2+ Stores Regulate Different Behaviors in Human Sperm*
نویسندگان
چکیده
منابع مشابه
2-APB-potentiated channels amplify CatSper-induced Ca2+ signals in human sperm
Ca2+i signalling is pivotal to sperm function. Progesterone, the best-characterized agonist of human sperm Ca2+i signalling, stimulates a biphasic [Ca2+]i rise, comprising a transient and subsequent sustained phase. In accordance with recent reports that progesterone directly activates CatSper, the [Ca2+]i transient was detectable in the anterior flagellum (where CatSper is expressed) 1-2 s bef...
متن کاملRegulation and roles of Ca2+ stores in human sperm
[Ca(2)(+)]i signalling is a key regulatory mechanism in sperm function. In mammalian sperm the Ca(2)(+)-permeable plasma membrane ion channel CatSper is central to [Ca(2)(+)]i signalling, but there is good evidence that Ca(2)(+) stored in intracellular organelles is also functionally important. Here we briefly review the current understanding of the diversity of Ca(2)(+) stores and the mechanis...
متن کاملCa2+ stores regulate ryanodine receptor Ca2+ release channels via luminal and cytosolic Ca2+ sites.
1. In muscle, intracellular calcium concentration, hence skeletal muscle force and cardiac output, is regulated by uptake and release of calcium from the sarcoplasmic reticulum. The ryanodine receptor (RyR) forms the calcium release channel in the sarcoplasmic reticulum. 2. The free [Ca2+] in the sarcoplasmic reticulum regulates the excitability of this store by stimulating the Ca2+ release cha...
متن کاملAction of steroids and plant triterpenoids on CatSper Ca2+ channels in human sperm.
The sperm-specific Ca channel CatSper (cation channel of sperm) controls the intracellular Ca concentration and, thereby, the swimming behavior of sperm. Human CatSper is activated by progesterone (1, 2), an oviductal hormone, which stimulates Ca influx and motility responses. By patch-clamp recording from human sperm, Mannowetz et al. (3) studied the action of the steroids pregnenolone sulfate...
متن کاملGeneration of Specific Ca2+ Signals from Ca2+ Stores and Endocytosis by Differential Coupling to Messengers
It remains unclear how different intracellular stores could interact and be recruited by Ca(2+)-releasing messengers to generate agonist-specific Ca(2+) signatures. In addition, refilling of acidic stores such as lysosomes and secretory granules occurs through endocytosis, but this has never been investigated with regard to specific Ca(2+) signatures. In pancreatic acinar cells, acetylcholine (...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 2013
ISSN: 0021-9258
DOI: 10.1074/jbc.m112.439356