Data/hora: 01/06/2024 09:23:11

Provedor de dados: | 56
País: | Brazil
Título: | Peritoneal fluid modulates the sperm acrosomal exocytosis induced by N-acetylglucosaminyl neoglycoprotein
Autores: | Passos,E.P.; Brugnara,L.; Facin,A.C.; Riffel,A.; Lima,G.R.; Freitas,V.; Brandelli,A.
Data: | 1999-01-01
Ano: | 1999
Palavras-chave: | Acrosome reaction; Endometriosis; Infertility; Peritoneal fluid; Sperm.
Resumo: | The effect of peritoneal fluid (PF) on the human sperm acrosome reaction (AR) was tested. Sperm was pre-incubated with PF and the AR was induced by calcium ionophore A23187 and a neoglycoprotein bearing N-acetylglycosamine residues (NGP). The AR induced by calcium ionophore was inhibited 40% by PF from controls (PFc) and 50% by PF from the endometriosis (PFe) group, but not by PF from infertile patients without endometriosis (PFi). No significant differences were found in the spontaneous AR. When the AR was induced by NGP, pre-incubation with PFc reduced (60%) the percentage of AR, while PFe and PFi caused no significant differences. The average rates of acrosome reactions obtained in control, NGP- and ionophore-treated sperm showed that NGP-induced exocytosis differed significantly between the PFc (11%) and PFe/PFi groups (17%), and the ionophore-induced AR was higher for PFi (33%) than PFc/PFe (25%). The incidence of the NGP-induced AR was reduced in the first hour of pre-incubation with PFc and remained nearly constant throughout 4 h of incubation. The present data indicate that PF possesses a protective factor which prevents premature AR.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000100009
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X1999000100009
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.32 n.1 1999
Fonte: | info:eu-repo/semantics/openAccess