The roles of follicular envelopes in the initiation of Xenopus oocyte maturation
Identifieur interne : 000814 ( Istex/Curation ); précédent : 000813; suivant : 000815The roles of follicular envelopes in the initiation of Xenopus oocyte maturation
Auteurs : Odile Mulner [France] ; René Ozon [France]Source :
- General and Comparative Endocrinology [ 0016-6480 ] ; 1981.
Abstract
Gonadotropins and progesterone induce in vitro meiotic maturation of the follicleenclosed Xenopus laevis oocyte. The kinetics of maturation are identical for both hormones. The enzymatic removal of the follicular envelopes which suppresses gonadotropin activity does not modify the efficiency of progesterone (1 μM)-induced maturation. It was, however, shown that defolliculation decreases the kinetic of maturation: GVBD50 (the time necessary to obtain 50% of germinal vesicle breakdown or maturation) was 8.08 ± 1.25 hr when follicles are induced to mature in the presence of progesterone and 4.30 ± 0.89 hr in the case of defolliculated oocytes. This result demonstrates that the follicular envelopes play a role in inhibition of steroid-induced maturation. When oocytes are defolliculated in the presence of aminogluthetimide, an inhibitor of steroid synthesis, the kinetic of oocyte maturation is also decreased (GVBD50: 4.98 ± 1.75 hr) indicating that the biosynthesis of steroid at the level of follicular envelopes is not involved in the phenomenon.
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DOI: 10.1016/0016-6480(81)90010-1
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<front><div type="abstract" xml:lang="en">Gonadotropins and progesterone induce in vitro meiotic maturation of the follicleenclosed Xenopus laevis oocyte. The kinetics of maturation are identical for both hormones. The enzymatic removal of the follicular envelopes which suppresses gonadotropin activity does not modify the efficiency of progesterone (1 μM)-induced maturation. It was, however, shown that defolliculation decreases the kinetic of maturation: GVBD50 (the time necessary to obtain 50% of germinal vesicle breakdown or maturation) was 8.08 ± 1.25 hr when follicles are induced to mature in the presence of progesterone and 4.30 ± 0.89 hr in the case of defolliculated oocytes. This result demonstrates that the follicular envelopes play a role in inhibition of steroid-induced maturation. When oocytes are defolliculated in the presence of aminogluthetimide, an inhibitor of steroid synthesis, the kinetic of oocyte maturation is also decreased (GVBD50: 4.98 ± 1.75 hr) indicating that the biosynthesis of steroid at the level of follicular envelopes is not involved in the phenomenon.</div>
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