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• W3025366223 abstract "Mammalian ejaculated spermatozoa must undergo a series of changes in the female reproductive tract, collectively called capacitation, in order to fertilize the oocyte. We reported that fibronectin (Fn), a glycoprotein from the extracellular matrix, and anandamide (AEA), one of the major members of the endocannabinoid family, are present in the bovine oviductal fluid and regulate bull sperm function. Also, AEA induces bovine sperm capacitation, through CB1 and TRPV1 receptors. In this work, we investigated if Fn induces bovine sperm capacitation thought the activation of the endocannabinoid system in this process. We incubated sperm with Fn (100 μg/ml) and/or capsazepine, a TRPV1 antagonist (0.1 μM) and some events related to sperm capacitation such as LPC-induced acrosome reaction, sperm-release from the oviduct, induction of PKA phosphorylated substrates (pPKAs) and protein tyrosine phosphorylation (pY) and nitric oxide (NO) production were assessed. Also, we studied the activity of fatty acid amide hydrolase (FAAH), the enzyme that degrades AEA. We found that Fn, via α5β1 integrin, induced capacitation-associated events. Also, Fn stimulated signaling pathways associated to capacitation as cAMP/PKA and NO/NO synthase. Moreover, Fn decreased the FAAH activity and this correlated with sperm capacitation. Capsazepine reversed fibronectin-induced capacitation, and pPKAs and NO levels. The incubation of spermatozoa with R-methanandamide (1.4 nM), a stable analogue of AEA, increased cAMP and pPKAs levels. The presence of H89 (50 μM) or KT5720 (100 nM) (PKA inhibitors) prevented AEA-induced capacitation. In addition, R-methanandamide and capsaicin (0.01 μM), a TRPV1 agonist, increased NO production via the PKA pathway. These results indicate that Fn, through α5β1, supports capacitation in bovine spermatozoa. This effect is dependent on the activation of TRPV1 through cAMP/PKA and NO signaling pathways. We propose that Fn could be considered as a new agent that promotes sperm capacitation in bull sperm. Our findings contribute to better understand the significance of Fn signaling in the capacitating events that lead to successful fertilization and embryo development in mammals including humans." @default.
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• W3025366223 date "2020-09-01" @default.
• W3025366223 modified "2023-10-06" @default.
• W3025366223 title "Fibronectin induces capacitation-associated events through the endocannabinoid system in bull sperm" @default.
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• W3025366223 doi "https://doi.org/10.1016/j.theriogenology.2020.04.031" @default.
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