Recombinant human OVGP1 increases intracellular calcium and further potentiates the effects of progesterone on human sperm.
J Assist Reprod Genet
; 39(10): 2287-2301, 2022 Oct.
Article
em En
| MEDLINE
| ID: mdl-35972586
ABSTRACT
PURPOSE:
To investigate the effects of recombinant human oviduct-specific glycoprotein (rHuOVGP1) alone and in combination with progesterone (P4) on intracellular Ca2+ concentration [Ca2+]i and to investigate if rHuOVGP1 in combination with P4 can further enhance tyrosine phosphorylation (pY) of sperm proteins during human sperm capacitation.METHODS:
Fluorometric flow cytometry was performed to examine the effects of rHuOVGP1 on [Ca2+]i in human sperm during capacitation. Confocal microscopy was used in conjunction with live cell imaging to analyze the influence of rHuOVGP1 and P4 on [Ca2+]i in the sperm tail and to examine the involvement of CatSper channels in their effect on [Ca2+]i. Western blot analysis was performed to assess the protein levels of p105, a major tyrosine-phosphorylated sperm protein.RESULTS:
rHuOVGP1 increases [Ca2+]i in human sperm at the beginning of capacitation and further increases and sustains the level of [Ca2+]i in the sperm tail following the addition of P4. Inhibition of CatSper channels impedes the effects of rHuOVGP1 on [Ca2+]i in the sperm tail. P4 alone can increase pY of a major human sperm protein, p105, yet yields a further increase when used in combination with rHuOVGP1.CONCLUSION:
The present study revealed that rHuOVGP1 may work with P4 to upregulate [Ca2+]i at the beginning of capacitation in part through CatSper channels which, in turn, leads to the downstream event of pY of sperm proteins and enhancement of sperm capacitation.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Progesterona
/
Cálcio
Limite:
Humans
/
Male
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article