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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Sperm functionality is differentially regulated by porcine oviductal extracellular vesicles from the distinct phases of the estrous cycle

S. M. Toledo-Guardiola https://orcid.org/0009-0006-3035-2981 A , P. Martínez-Díaz https://orcid.org/0000-0001-8141-5475 A , R. Martínez-Núñez https://orcid.org/0009-0005-6199-8761 A , S. Navarro-Serna https://orcid.org/0000-0002-5210-1415 A , C. Soriano-Úbeda https://orcid.org/0000-0003-2880-3342 B , J. Romero-Aguirregomezcorta https://orcid.org/0000-0001-7779-6869 A C * and C. Matás https://orcid.org/0000-0002-8252-120X A C *
+ Author Affiliations
- Author Affiliations

A Department of Physiology, Faculty of Veterinary Science, International Excellence Campus for Higher Education and Research ‘Campus Mare Nostrum’, University of Murcia, Murcia, Spain.

B Department of Veterinary Medicine, Surgery, and Anatomy, University of León, León, Spain.

C Institute for Biomedical Research of Murcia (IMIB-Arrixaca), Murcia, Spain.

* Correspondence to: cmatas@um.es, jon.romero@um.es

Handling Editor: Marc Yeste

Reproduction, Fertility and Development 36, RD23239 https://doi.org/10.1071/RD23239
Submitted: 29 December 2023  Accepted: 8 April 2024  Published online: 7 May 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Extracellular vesicles (EVs) derived from the oviductal fluid (oEVs) play a critical role in various reproductive processes, including sperm capacitation, fertilisation, and early embryo development.

Aims

To characterise porcine oEVs (poEVs) from different stages of the estrous cycle (late follicular, LF; early luteal, EL; mid luteal, ML; late luteal, LL) and investigate their impact on sperm functionality.

Methods

poEVs were isolated, characterised, and labelled to assess their binding to boar spermatozoa. The effects of poEVs on sperm motility, viability, acrosomal status, protein kinase A phosphorylation (pPKAs), tyrosine phosphorylation (Tyr-P), and in in vitro fertility were analysed.

Key results

poEVs were observed as round or cup-shaped membrane-surrounded vesicles. Statistical analysis showed that poEVs did not significantly differ in size, quantity, or protein concentration among phases of the estrous cycle. However, LF poEVs demonstrated a higher affinity for binding to sperm. Treatment with EL, ML, and LL poEVs resulted in a decrease in sperm progressive motility and total motility. Moreover, pPKA levels were reduced in presence of LF, EL, and ML poEVs, while Tyr-P levels did not differ between groups. LF poEVs also reduced sperm penetration rate and the number of spermatozoa per penetrated oocyte (P < 0.05).

Conclusions

poEVs from different stages of the estrous cycle play a modulatory role in sperm functionality by interacting with spermatozoa, affecting motility and capacitation, and participating in sperm–oocyte interaction.

Implications

The differential effects of LF and LL poEVs suggest the potential use of poEVs as additives in IVF systems to regulate sperm–oocyte interaction.

Keywords: capacitation, estrous cycle, extracellular vesicles, in vitro fertilisation, motility, oviductal fluid, porcine, sperm.

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