Involvement of osmo-sensitive calcium influx in human sperm activation
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چکیده
منابع مشابه
Involvement of osmo-sensitive calcium influx in human sperm activation.
Mammalian spermatozoa must undergo capacitation and acrosome reaction before fertilization. To date, the precise mechanisms regulating these complex processes are not well understood but it is generally agreed that they involve an influx of calcium from the extracellular space through, as yet, poorly characterized plasma membrane pathways. Here we present evidence for a novel mechanism to incre...
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Under the guidance and regulation of hormone signaling, large majority of mammalian oocytes go through twice cell cycle arrest-resumption prior to the fertilized egg splits: oocyte maturation and egg activation. Cytosolic free calcium elevations and endoplasmic reticulum calcium store alternations are actively involved in triggering the complex machineries and events during oogenesis. Among the...
متن کاملEffect of intracellular pH on depolarization-evoked calcium influx in human sperm.
Human sperm are endowed with putative voltage-dependent calcium channels (VDCC) that produce measurable increases in intracellular calcium concentration ([Ca(2+)](i)) in response to membrane depolarization with potassium. These channels are blocked by nickel, inactivate in 1-2 min in calcium-deprived medium, and are remarkably stimulated by NH(4)Cl, suggesting a role for intracellular pH (pH(i)...
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BACKGROUND The hypo-osmotic swelling (HOS) test evaluates the ability of the functional sperm plasma membrane to stretch following cell swelling when exposed to hypo-osmotic solutions. Sperm samples with low HOS scores show low fertilization and pregnancy rates during assisted reproductive techniques, though data are controversial. The aim of this study was to compare the results of the HOS tes...
متن کاملProstaglandins induce calcium influx in human spermatozoa.
Progesterone, prostaglandin and follicular fluid are reported to enhance the acrosome reaction through the influx of extracellular calcium into the cytoplasm of human spermatozoa. Prostaglandins are present within the male reproductive tract, and high concentrations of prostaglandins exist in seminal fluid. In order to investigate the mechanisms by which prostaglandins enhance the acrosome reac...
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ژورنال
عنوان ژورنال: Molecular Human Reproduction
سال: 1996
ISSN: 1360-9947,1460-2407
DOI: 10.1093/molehr/2.12.903