NDLI: Rat oocyte maturation in vitro: relief of cyclic AMP inhibition by gonadotropins.

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Rat oocyte maturation in vitro: relief of cyclic AMP inhibition by gonadotropins.

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Rat oocyte maturation in vitro: relief of cyclic AMP inhibition by gonadotropins.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Beers, W. H. Dekel, N.
Abstract	The hormone-independent, spontaneous maturation that rat oocytes undergo in vitro can be inhibited by derivatives of cyclic AMP and inhibitors of cyclic nucleotide phosphodiesterase. In this study, we have shown that this inhibition of maturation can be partially relieved by preparations of ovine and rat luteinizing hormone or follicle-stimulating hormone. The ability of gonadotropins to foster the resumption of maturation in cultures of cyclic AMP-inhibited oocytes suggests that this system is suitable for studies of the hormonal control of oocyte development. The dose and time dependency of the response to gonadotropins has been examined in order to study the role of these hormones in oocyte maturation and to compare this effect to other known responses of the cumulus-oocyte complex. These studies show that highly purified preparations of rat gonadotropins are less effective inducers of maturation than the more commonly used, but considerably less purified, preparations of ovine gonadotropins. Almost complete relief of inhibition is observed, however, when the oocytes are exposed to a combination of rat luteinizing hormone and follicle-stimulating hormone. Oocyte maturation was not influenced by the sex steroids progesterone or 17beta-estradiol. Our results suggest that: (i) cyclic AMP is involved in the intrafollicular inhibition of oocyte maturation; (ii) both gonadotropins are required for maximal stimulation of the resumption of oocyte meiosis; and (iii) steroids are not involved in this response to gonadotropins.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	9
Volume Number	75
Language	English
Publisher	National Academy of Sciences
Publisher Date	1978-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Cyclic AMP Antagonists & Inhibitors Follicle Stimulating Hormone Pharmacology Luteinizing Hormone Oocytes Drug Effects Oogenesis Ovum Animals Bucladesine Dose-Response Relationship, Drug Drug Interactions Meiosis Nuclear Envelope Ultrastructure Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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