Proteomic characterization of human sperm plasma membrane‐associated proteins and their role in capacitation

Background Plasma membranes of ejaculated sperm are covered by epididymal and accessory glands secreted proteins that must be released from sperm surface during the female reproductive tract passage in order to capacitate and fertilize the oocyte. Objectives As human sperm plasma membrane‐associated...

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Bibliographic Details
Published in:Andrology (Oxford) 2020-01, Vol.8 (1), p.171-180
Main Authors: Hernández‐Silva, Gabriela, Fabián López‐Araiza, Jorge Elías, López‐Torres, Aideé Saray, Larrea, Fernando, Torres‐Flores, Víctor, Chirinos, Mayel
Format: Article
Language:English
Subjects:
capacitation
Cell Membrane - metabolism
decapacitation factor
Humans
Male
male reproductive tract
Mass spectrometry
Membrane Proteins - metabolism
Motility
Phosphorylation
Proteins
Proteome
Scientific imaging
Sperm
Sperm Capacitation
spermatozoa
Spermatozoa - metabolism
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Summary:Background Plasma membranes of ejaculated sperm are covered by epididymal and accessory glands secreted proteins that must be released from sperm surface during the female reproductive tract passage in order to capacitate and fertilize the oocyte. Objectives As human sperm plasma membrane‐associated proteins (SMAP) have not yet been investigated, the aim of this study was to characterize the SMAP released during in vitro human capacitation and to study their possible role as decapacitation factors. Materials and Methods SMAP were characterized by 2‐dimensional electrophoresis and mass spectrometry analysis. Besides, we explored SMAP effects on motility, protein tyrosine phosphorylation, and calcium ionophore‐induced acrosome reaction of spermatozoa either incubated for 6 h in capacitating medium ± SMAP or for 5 h in capacitating medium alone followed by incubation for 1 h ± SMAP. Results Mass spectrometry analysis allowed the identification of 29 proteins, all of which have previously been identified in the human seminal fluid. Spermatozoa incubated for 6 h under capacitating conditions in the presence of the SMAP showed a significant decrease in the incidence of non‐progressive motility, hyperactivation, protein tyrosine phosphorylation, and calcium ionophore‐induced acrosome reaction. However, spermatozoa incubated for 5 h in capacitating medium and further incubated for 1 h with the SMAP showed a lower percentage of spermatozoa with non‐progressive motility and hyperactivated cells but no effects on protein tyrosine phosphorylation were detected. Discussion and Conclusions Our results indicate that SMAP inhibit the progress of human sperm capacitation, but only motility changes related to capacitation may be reversed by these proteins. The study of the identified proteins on sperm function and their mechanisms of action on this cell may contribute to the understanding of their role during capacitation.
ISSN:2047-2919
2047-2927
DOI:10.1111/andr.12627