Document Detail


Localization of central pressor action of bradykinin in medulla oblongata.
MedLine Citation:
PMID:  8214105     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The intracerebroventricular injection of bradykinin produces an increase in arterial blood pressure. The site of action for this effect has been reported to be in the lateral septal area, in the hypothalamus, or in the ventral portion of the third ventricle. Bradykinin injected into the fourth cerebral ventricle of unanesthetized rats produced a pressor effect with a shorter latency and a larger maximal effect than when injected in the third or lateral ventricles. Bradykinin in the fourth ventricle was also 10 times more potent than in the third ventricle and 100 times more potent than in the lateral ventricle. No changes in blood pressure were observed when bradykinin was injected into the cerebellum or in the subarachnoid space of the ventral surface of the brain or of the medulla. Microinjections in the medulla oblongata showed that the pressor responses were obtained when bradykinin was injected in the nucleus tractus solitarius or in the dorsal spinal trigeminal tract. No effect was observed after injections were given into the ventral, ventral lateral medulla, or other medullary regions. The data suggest that bradykinin may play a regulatory role in the central control of blood pressure by stimulating sites that are near the dorsal and dorsal lateral surfaces of the medulla and accessible to kinins in cerebrospinal fluid and in the cerebral arterial circulation.
Authors:
D R Fior; D T Martins; C J Lindsey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  265     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1993 Sep 
Date Detail:
Created Date:  1993-11-22     Completed Date:  1993-11-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H1000-6     Citation Subset:  IM    
Affiliation:
Department of Biophysics, Escola Paulista de Medicina, São Paulo, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure / drug effects*,  physiology*
Bradykinin / pharmacology*
Cerebral Ventricles / physiology
Dose-Response Relationship, Drug
Injections, Intraventricular
Male
Medulla Oblongata / physiology*
Rats
Rats, Wistar
Chemical
Reg. No./Substance:
58-82-2/Bradykinin

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


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