Document Detail


Influence of intracellular renin on heart cell communication.
MedLine Citation:
PMID:  7768559     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The influence of intracellular renin and angiotensinogen on the control of cell-to-cell communication in heart muscle was investigated in cell pairs isolated from adult rat ventricle. Junctional conductance was measured with two separated voltage-clamp circuits. Intracellular dialysis of renin (0.2 pmol/L) caused a decrease in junctional conductance of 29 +/- 3.8% (+/- SEM, P < .05) in 7 minutes. The effect of renin on junctional conductance seems to be mainly due to the synthesis of Ang II because enalaprilat (10(-9) mol/L) dialyzed into the cell caused an appreciable reduction in the effect of renin. The intracellular administration of renin (0.2 pmol/L) plus angiotensinogen (0.4 pmol/L) produced a faster and stronger fall in junctional conductance (84.3 +/- 1.35%, P < .05), and the effect was greatly reduced by enalaprilat. The effects of both renin and angiotensinogen on junctional conductance were not related to a fall in surface cell membrane resistance or a change in series resistance. The effect of renin on junctional conductance was blocked by intracellular administration of a renin inhibitor (S 2864). Moreover, renin dialyzed into just one cell of the pair induced rectification of the junctional membrane, which was prevented by enalaprilat. The results support the view that an intracrine renin-angiotensin system in the heart regulates intercellular communication.
Authors:
W C De Mello
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hypertension     Volume:  25     ISSN:  0194-911X     ISO Abbreviation:  Hypertension     Publication Date:  1995 Jun 
Date Detail:
Created Date:  1995-06-30     Completed Date:  1995-06-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7906255     Medline TA:  Hypertension     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1172-7     Citation Subset:  IM    
Affiliation:
Department of Pharmacology and Anesthesiology, School of Medicine, University of Puerto Rico, San Juan 00936-5067.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Communication / drug effects*
Heart / drug effects*
Rats
Renin / pharmacology*
Renin-Angiotensin System / physiology
Grant Support
ID/Acronym/Agency:
532943//PHS HHS
Chemical
Reg. No./Substance:
EC 3.4.23.15/Renin

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


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