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Vol. 20, No. 2, 1976
Issue release date: 1976
Section title: Paper
Neuroendocrinology 1976;20:121–135
(DOI:10.1159/000122476)

Differential Effects of Dopamine Agonists and Haloperidol on Release of Prolactin, Thyroid Stimulating Hormone, Growth Hormone and Luteinizing Hormone in Rats

Mueller G.P. · Simpkins J. · Meites J. · Moore K.E.
Departments of Physiology and Pharmacology, Michigan State University, East Lansing, Mich.

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Article / Publication Details

First-Page Preview
Abstract of Paper

Received: 9/9/1975
Accepted: 12/2/1975
Published online: 3/20/2008
Issue release date: 1976

Number of Print Pages: 15
Number of Figures: 0
Number of Tables: 0

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

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

Abstract

The dose-response effects of apomorphine and ET-495 (piribedil), 2 specific dopamine (DA) receptor stimulators, and haloperidol, a DA receptor blocker, were tested on the secretion of prolactin (PRL), thyroid stimulating hormone (TSH), growth hormone (GH) and luteinizing hormone (LH) in male rats. Both apomorphine and piribedil reduced serum PRL and TSH levels, stimulated GH release at low but not at high doses and either had no effect or tended to reduce serum LH levels. The minimal effective dose of apomorphine for reducing PRL by 30 min was 0.01 mg/kg; TSH inhibition was observed with a dose of 0.1–0.3 mg/kg. The inhibitory effects of apomorphine (1.0 mg/kg) on PRL and TSH levels were maximal by 15 min and diminished by 120 min; plasma GH was highest 120 min after injection. Thyroidectomy (10 days) markedly elevated serum TSH, had no effect on serum PRL and inhibited the ability of apomorphine (0.1 or 0.3 mg/kg) to reduce TSH but not PRL levels. These observations may indicate that separate dopaminergic control mechanisms exist for TSH and PRL secretion. Administration of haloperidol elevated serum PRL, tended to lower TSH, dramatically reduced GH and had no effect on LH levels. Haloperidol pre-treatment blocked the effects of apomorphine on PRL, TSH and GH secretion. The overall results of this study indicate that DA agonists inhibit PRL and TSH, stimulate GH but do not stimulate LH release in male rats.

© 1976 S. Karger AG, Basel


  

Article Information

Received: September 9, 1975
Revised MS accepted: December 2, 1975
Published online: March 20, 2008
Number of Print Pages : 15

  

Publication Details

Neuroendocrinology (International Journal for Basic and Clinical Studies on Neuroendocrine Relationships)

Vol. 20, No. 2, Year 1976 (Cover Date: 1976)

Journal Editor: Millar R.P. (Edinburgh)
ISSN: 0028–3835 (Print), eISSN: 1423–0194 (Online)

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


Article / Publication Details

First-Page Preview
Abstract of Paper

Received: 9/9/1975
Accepted: 12/2/1975
Published online: 3/20/2008
Issue release date: 1976

Number of Print Pages: 15
Number of Figures: 0
Number of Tables: 0

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

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


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