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• W2005458664 endingPage "435" @default.
• W2005458664 startingPage "428" @default.
• W2005458664 abstract "Second messengers are involved in sperm fertilizing potential, as both motility and the acrosome reaction are influenced by cAMP. Moreover, the activity of cyclic nucleotides is implicated in the appearance of tyrosine phosphorylated sperm proteins, which is associated with capacitation in the mammalian spermatozoa. Nevertheless, the involvement of the cAMP/protein kinase A (PK-A) pathway during pig sperm capacitation may be different from that observed in other mammals. The objective of the present study was to clarify the cAMP/PK-A pathway during the capacitation of porcine spermatozoa and to evaluate this impact on the p32 sperm tyrosine phosphoprotein appearance. The presence of p32 was assessed after incubating fresh pig sperm with IBMX/db-cAMP, H-89, a PK-A inhibitor or bistyrphostin, a tyrosine kinase inhibitor, in capacitating (CM) or non-capacitating conditions (NCM) by immunoblotting SDS-extracted and separated sperm proteins using an anti-phosphotyrosine antibody. When pig spermatozoa were incubated in CM supplemented with H-89 (50 microM) or bistyrphostin (1.2 microM), capacitation decreased significantly (P < 0.001). The p32 sperm tyrosine phosphoprotein, previously shown to be associated with capacitation of porcine sperm though not necessarily an end point of this phenomenon, was not modulated by IBMX/db-cAMP (100 microM/1 mM), H-89 (50 microM) nor bistyrphostin (1.2 microM). Our results indicate, therefore, that pig sperm are regulated somewhat differently than as described for other mammals, because although the cAMP/PK-A and tyrosine kinase pathways are involved in capacitation, they do not influence the appearance of p32." @default.
• W2005458664 created "2016-06-24" @default.
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• W2005458664 creator A5013361905 @default.
• W2005458664 date "2004-09-29" @default.
• W2005458664 modified "2023-10-06" @default.
• W2005458664 title "Implication of cAMP during porcine sperm capacitation and protein tyrosine phosphorylation" @default.
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• W2005458664 doi "https://doi.org/10.1002/mrd.20178" @default.
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