| Role of ovarian steroids on the catecholamine synthesis and release in female rat adrenal: in vivo and in vitro studies. | |
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MedLine Citation:
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PMID: 2567956 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In a previous report, we describe the existence of an effect of ovarian steroids on the adrenal medulla activities of the enzymes involved in catecholamine (CA) catabolism. To complete that study, we have now examined the adrenal medulla activity of tyrosine hydroxylase (TH), the rate limiting enzyme of the CA synthesis, as well as the in vitro release of CAs from incubated adrenal medullas. The study has been performed with adrenal medullas from female rats with physiological (estrous cycle) or pharmacological (steroid treatment) alterations in their circulating levels of estrogens and progesterone. The in vitro release of CAs from incubated adrenal medullas of estradiol-treated rats was lower than that obtained in vehicle-treated animals. In consequence, the preovulatory increase of estradiol would be the responsible of the low in vitro release of CAs observed during the estrous phase of ovarian cycle. However, this steroid does not seem to affect the CA synthesis, since the adrenal medulla activity of TH was not altered after the estradiol treatment nor during the estrous cycle. On the contrary, progesterone treatment increased TH activity 24 h after the steroid injection. This effect was independent of estradiol. However, an estrogen-dependent increase in TH activity occurred short-time after the steroid administration. Although progesterone by itself failed to modify the in vitro release of both CAs, it was able to reverse the estradiol-induced decrease in epinephrine release. In summary, estradiol seems to decrease the ability of the adrenal medulla to release CAs to the peripheral blood, without affecting the CA synthesis, whereas progesterone mostly affects TH activity, being its effects temporary and partially depending on estrogens. |
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Authors:
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R de Miguel; J J Fernández-Ruiz; M L Hernández; J A Ramos |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Life sciences Volume: 44 ISSN: 0024-3205 ISO Abbreviation: Life Sci. Publication Date: 1989 |
Date Detail:
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Created Date: 1989-08-02 Completed Date: 1989-08-02 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0375521 Medline TA: Life Sci Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 1979-86 Citation Subset: IM |
Affiliation:
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Department of Biochemistry, Faculty of Medicine, Complutense University, Madrid, Spain. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adrenal Medulla
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metabolism* Animals Catecholamines / metabolism* Estradiol / pharmacology* Estrus Female Ovariectomy Ovary / physiology* Progesterone / pharmacology* Rats Rats, Inbred Strains Secretory Rate / drug effects Time Factors Tyrosine 3-Monooxygenase / metabolism |
| Chemical | |
Reg. No./Substance:
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0/Catecholamines; 50-28-2/Estradiol; 57-83-0/Progesterone; EC 1.14.16.2/Tyrosine 3-Monooxygenase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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