Document Detail


Microinjection of thyrotropin-releasing hormone in the paraventricular nucleus of the hypothalamus stimulates gastric contractility.
MedLine Citation:
PMID:  8050036     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Changes in gastric contractility following microinjection of thyrotropin-releasing hormone (TRH) into the paraventricular nucleus of the hypothalamus (PVN) were examined in fasted, urethane-anesthetized rats. Gastric contractility was measured with extraluminal force transducers and analysed by computer. Unilateral and bilateral PVN microinjections of TRH (0.5 and 1.0 microgram) significantly increased the force index of gastric contractions from 0 to 60 min postinjection, when compared with animals microinjected with 0.1 microgram TRH, 0.1% BSA or TRH (0.5 and 1.0 microgram TRH) in sites adjacent to the PVN. The gastric force index was also significantly elevated from 61 to 120 min postinjection in rats receiving bilateral PVN microinjections of TRH (0.5 and 1.0 microgram). Peak gastric responses occurred within 10-20 min postinjection and represented an approximately eight-fold increase over basal values. In the remaining groups, the force index was not significantly altered from preinjection values. The excitatory action of TRH (1.0 microgram) on gastric contractility was completely abolished by subdiaphragmatic vagotomy. These results suggest that TRH acts within the PVN to stimulate gastric contractility via vagal-dependent pathways.
Authors:
N S Morrow; D Novin; T Garrick
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Brain research     Volume:  644     ISSN:  0006-8993     ISO Abbreviation:  Brain Res.     Publication Date:  1994 May 
Date Detail:
Created Date:  1994-09-08     Completed Date:  1994-09-08     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  243-50     Citation Subset:  IM    
Affiliation:
Department of Psychiatry, Department of Veterans Affairs Medical Center, West Los Angeles, CA 90073.
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MeSH Terms
Descriptor/Qualifier:
Animals
Body Temperature / drug effects
Gastrointestinal Motility / drug effects*
Male
Microinjections
Paraventricular Hypothalamic Nucleus / drug effects,  physiology*
Rats
Rats, Sprague-Dawley
Thyrotropin-Releasing Hormone / administration & dosage,  pharmacology*
Transducers
Vagotomy
Grant Support
ID/Acronym/Agency:
DK 41301/DK/NIDDK NIH HHS; NIMH 5T32 M17140/MH/NIMH NIH HHS
Chemical
Reg. No./Substance:
24305-27-9/Thyrotropin-Releasing Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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