Epididymal and ejaculated sperm functionality is regulated differently by periovulatory oviductal fluid in pigs.

Abstract:

BACKGROUND:The current results of in vitro reproduction techniques in pigs, such as in vitro fertilization (IVF) and embryo development, show high performance with both epididymal and ejaculated spermatozoa. However, the results using ejaculated spermatozoa are even better. Ejaculated spermatozoa are exposed to the secretions of the accessory seminal glands: the seminal plasma (SP). It has been reported that exposure of spermatozoa to reproductive fluids, such as SP or periovulatory oviductal fluid (pOF), modulates sperm functionality both in vivo and in vitro. But whether or not this modulating effect of pOF depends on the origin of the spermatozoa being epididymal or ejaculated, is still unknown. OBJECTIVES:To determine and compare the effect of pOF on epididymal and ejaculated sperm functionality. MATERIAL AND METHODS:The effects of incubating spermatozoa from the epididymis and ejaculate with pOF in capacitating conditions were investigated by analyzing sperm motility, phosphorylation of protein kinase A substrates and proteins in tyrosine (pPKAs and pTyr, respectively), the interaction of the spermatozoa with the oocyte in IVF and intracytoplasmic sperm injection (ICSI), and, finally, the spermatozoa chromatin condensation status. RESULTS:The pOF modified events related to capacitation in epididymal spermatozoa by decreasing motility, pPKAs and pTyr. In the interaction with the oocyte after sperm capacitation, pOF regulated the epididymal and ejaculated spermatozoa differently. While pOF decreased the number of spermatozoa bound to the zona pellucida (Spz/ZP) and increased oocyte activation after ICSI with epididymal spermatozoa, with the ejaculated spermatozoa, it decreased the mean number penetrating each oocyte (Spz/O). Additionally, pOF significantly increased the nuclear decondensation of the epididymal spermatozoa after the fertilization of the oocyte. CONCLUSION:The modulation of sperm functionality by pOF is conditioned by the origin of the spermatozoa.

journal_name

Andrology

journal_title

Andrology

authors

Soriano-Úbeda C,Avilés-López K,García-Vázquez FA,Romero-Aguirregomezcorta J,Matás C

doi

10.1111/andr.12902

subject

Has Abstract

pub_date

2021-01-01 00:00:00

pages

426-439

issue

1

eissn

2047-2919

issn

2047-2927

journal_volume

9

pub_type

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