The activity of three glycosidases (ß-Ν-acetyloglucosaminidase, α-mannosidase, and ß-galactosidase) in the follicular fluid and in the maturation medium affects bovine oocyte maturation.
Theriogenology
; 85(8): 1468-75, 2016 May.
Article
em En
| MEDLINE
| ID: mdl-26852070
ABSTRACT
We studied the role of follicular fluid's (FF) glycosidase (α-mannosidase [α-ΜΑΝ], ß-Ν-acetyloglucosaminidase [NAGASE], ß-galactosidase [ß-GAL]) activity during IVM of bovine oocytes. Oocytes were allocated into two groups according to the follicular size (small follicle [SF] 2-5 mm, large follicle [LF] >5-8 mm). In experiment 1, cumulus-oocyte complexes (COCs) quality was evaluated according to morphologic criteria (grades A, B-C, D); oocyte (n = 801) nuclear maturation was assessed after 24 hours of incubation. Bovine embryos were produced in vitro in groups (experiment 2, n = 1503 oocytes) or individually (experiment 3, n = 50 oocytes). More grade-A and -BC COCs were collected from SF and LF groups, respectively (P < 0.05). Maturation rate (experiment 1) and cleavage rate (experiments 2 and 3) were similar in SF and LF groups. Activity of all glycosidases in FF was higher (P < 0.05) in SF group than in LF group, whereas in maturation medium of SF group it was, overall, significantly lower than in that of LF (experiments 2 and 3). In FF of SF group, NAGASE positively associated with grade-A oocytes and negatively with BC oocytes; increased ß-GAL was associated with degenerated oocytes. Cleavage rate in LF group, related negatively to NAGASE and positively to α-MAN in maturation medium. These results indicate that during maturation, COCs release NAGASE and consume ß-GAL, but differences probably exist between individual and group maturation.
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Base de dados:
MEDLINE
Assunto principal:
Oócitos
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Acetilglucosaminidase
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Bovinos
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Beta-Galactosidase
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Alfa-Manosidase
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Técnicas de Maturação in Vitro de Oócitos
Limite:
Animals
Idioma:
En
Revista:
Theriogenology
Ano de publicação:
2016
Tipo de documento:
Article