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- W78492697 abstract "The contribution of store-operated calcium entry (SOCE) in the response of human sperm to progesterone, a steroid secreted from the cumulus cells surrounding the oocyte, has not yet been elucidated. The aim of this study was to investigate the presence of SOCE proteins in human sperm and examine the effects of pharmacological modulation of SOCE on the progesterone-induced biphasic intracellular calcium concentration ([Ca(^{2+})]i) response. STIM (stromal interacting molecule) and Orai, proteins of the SOCE system were detected in human sperm in a similar location to intracellular Ca(^{2+}) stores. 2-aminoethyldiphenyl borate (2-APB; SOCE modulator) altered SOCE in human sperm in a bimodal manner as seen in other cell types. Furthermore, 5(mu)M 2-APB potentiated the initial progesterone-induced [Ca(^{2+})]i transient within the neck and midpiece, but not in the flagellum. In the sustained phase of the progesterone-induced [Ca(^{2+})]i response both 5(mu)M 2-APB and 10(mu)M loperamide (another modulator of SOCE) potentiated the [Ca(^{2+})]i response. Higher doses of 2-APB (50-200(mu)M) didn’t potentiate the transient [Ca(^{2+})]i and inhibited the sustained response consistent with reported actions on SOCE. Ryanodine receptors were localised to the neck/midpiece region which suggested that they may mobilise intracellular Ca(^{2+}) stores in response to progesterone, leading to activation of STIM/Orai and initiating SOCE." @default.
- W78492697 created "2016-06-24" @default.
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- W78492697 date "2012-07-01" @default.
- W78492697 modified "2023-09-28" @default.
- W78492697 title "Store-operated calcium entry in human spermatozoa" @default.
- W78492697 hasPublicationYear "2012" @default.
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