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Original Paper

Autoradiographic Analyses of the Effects of Adrenalectomy and Corticosterone on 5-HT1A and 5-HT1B Receptors in the Dorsal Hippocampus and Cortex of the Rat

Mendelson S.D. · McEwen B.S.

Author affiliations

Laboratory of Neuroendocrinology, The Rockefeller University, New York, N.Y., USA

Related Articles for ""

Neuroendocrinology 1992;55:444–450

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: May 10, 1991
Accepted: July 17, 1991
Published online: April 07, 2008
Issue release date: 1992

Number of Print Pages: 7
Number of Figures: 0
Number of Tables: 0

ISSN: 0028-3835 (Print)
eISSN: 1423-0194 (Online)

For additional information: https://www.karger.com/NEN

Abstract

Quantitative autoradiography was used to evaluate the effects of adrenalectomy (ADX) and corticosterone (CORT) on binding at 5-HT1A and 5-HT1B receptors in the dorsal hippocampus and cortex of the rat. ADX increased binding of [3H]8-hydroxy-2-(di-n-propylamino)tetralin at 5-HT1A receptors in the oriens and lacunosum moleculare layers of CA2 and CA3, in the lacuno-sum moleculare layer of CA4 region, and in the dentate gyms. In restraint-stressed ADX rats, binding was increased only in the oriens and lacunosum moleculare layers of CA2. Restoration of baseline levels of CORT reversed the effects of ADX on 5-HT1A receptors in the hippocampus, while high levels of CORT decreased binding at 5-HT1A receptors in the dentate gyms. No treatment affected binding at 5-HT1A receptors in the CAl region of the hippocampus or in the cortex. ADX increased binding of [125I]iodocyanopindolol at 5-HT1B receptors in the infrapyramidal dentate, but this effect was not observed in ADX rats that were restrained. CORT treatment in both ADX and SHAM (adrenally intact) rats resulted in binding at 5-HT1B receptors that was lower than that in untreated ADX and SHAM rats in the infrapyramidal dentate, and lower than that in ADX rats in the suprapyramidal dentate and CA4. In ADX and SHAM rats, CORT also reduced binding at 5-HT1B receptors in area 2 of the cortex. It is suggested that decreases in binding at 5-HTA and 5-HT1B/1D receptors resulting from chronic exposure to high levels of CORT may also occur in animals that fail to adapt to chronic severe stress. Such changes in binding may play important roles in the etiology of depression.

© 1992 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: May 10, 1991
Accepted: July 17, 1991
Published online: April 07, 2008
Issue release date: 1992

Number of Print Pages: 7
Number of Figures: 0
Number of Tables: 0

ISSN: 0028-3835 (Print)
eISSN: 1423-0194 (Online)

For additional information: https://www.karger.com/NEN


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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