Seminal plasma, sperm concentration, and sperm-PMN interaction in the donkey : An in vitro model to study endometrial inflammation at post-insemination
Miró, Jordi (Universitat Autònoma de Barcelona. Departament de Medicina i Cirurgia Animals)
Marín Estruch, Henar (Universitat Autònoma de Barcelona. Departament de Medicina i Cirurgia Animals)
Papas, Marion (Universitat Autònoma de Barcelona. Departament de Medicina i Cirurgia Animals)
Gacem, Sabrina (Universitat Autònoma de Barcelona. Departament de Medicina i Cirurgia Animals)
Catalán, Jaime (Universitat Autònoma de Barcelona. Departament de Medicina i Cirurgia Animals)
Yeste Oliveras, Marc (Universitat de Girona. Departament de Biologia Cel·lular)

Date:	2020
Abstract:	In the donkey, artificial insemination (AI) with frozen-thawed semen is associated with low fertility rates, which could be partially augmented through adding seminal plasma (SP) and increasing sperm concentration. On the other hand, post-AI endometrial inflammation in the jenny is significantly higher than in the mare. While previous studies analyzed this response through recovering Polymorphonuclear Neutrophils (PMN) from uterine washings, successive lavages can detrimentally impact the endometrium, leading to fertility issues. For this reason, the first set of experiments in this work intended to set an in vitro model through harvesting PMN from the peripheral blood of jennies. Thereafter, how PMN, which require a triggering agent like formyl-methionyl-leucyl-phenylalanine (FMLP) to be activated, are affected by donkey semen was interrogated. Finally, we tested how four concentrations of spermatozoa (100 × 10, 200 × 10, 500 × 10 and 1000 × 10 spermatozoa/mL) affected their interaction with PMN. We observed that semen, which consists of sperm and SP, is able to activate PMN. Whereas there was a reduced percentage of spermatozoa phagocytosed by PMN, most remained attached on the PMN surface or into a surrounding halo. Spermatozoa not attached to PMN were viable, and most of those bound to PMN were also viable and showed high tail beating. Finally, only sperm concentrations higher than 500 × 10 spermatozoa/mL showed free sperm cells after 3 h of incubation, and percentages of spermatozoa not attached to PMN were higher at 3 h than at 1 h, exhibiting high motility. We can thus conclude that semen activates PMN in the donkey, and that the percentage of spermatozoa phagocytosed by PMN is low. Furthermore, because percentages of spermatozoa not attached to PMN were higher after 3 h than after 1 h of incubation, we suggest that PMN-sperm interaction plays an instrumental role in the reproductive strategy of the donkey.
Grants:	Ministerio de Ciencia e Innovación AGL2017-88329-R Ministerio de Ciencia e Innovación RYC-2014-15581 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017-SGR-1229
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Ases ; Reproducció ; Seminal plasma ; Sperm ; Polymorphonuclear neutrophils ; Donkey
Published in:	International journal of molecular sciences, Vol. 21 Núm. 10 (february 2020) , p. 3478, ISSN 1422-0067

DOI: 10.3390/ijms21103478
PMID: 32423134

16 p, 2.5 MB

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