Document Detail


Angiotensin II reduces infarct size and has no effect on post-ischaemic contractile dysfunction in isolated rat hearts.
MedLine Citation:
PMID:  11522595     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. In order to test the hypothesis that angiotensin II exacerbates myocardial ischaemia-reperfusion (IR) injury, we examined the effects of graded angiotension II concentrations of angiotensin II on IR injury in both working and non-working (Langendorff) isolated rat hearts. 2. Non-working hearts were subjected to 30 min aerobic perfusion (baseline) then 25 min of global, no-flow ischaemia followed by 30 min of reperfusion either in the absence (control, n=7) or presence of 1 (n=6) or 10 nM (n=5) angiotensin II). Recoveries of LV developed pressure and coronary flow after 30 min reperfusion in control hearts (58+/-9 and 40+/-8% of baseline levels, respectively) were no different from hearts treated with 1 or 10 nM angiotensin II. Infarct size (determined at the end of reperfusion by triphenyltetrazolium chloride staining) was reduced by angiotensin II in a concentration-dependent manner (from a control value of 27+/-3 to 18+/-4% and 9+/-3% of the LV, respectively). 3. Working hearts were subjected to 50 min pre-ischaemic (pre-I) aerobic perfusion then 30 min of global, no-flow ischaemia followed by 30 min of reperfusion either in the absence (control, n=14) or presence of 1 (n=8), 10 (n=7) or 100 nM (n=7) angiotensin II). In controls, post-ischaemic (post-I) left ventricular (LV) work and efficiency of oxygen consumption were depressed (43+/-9 and 42+/-10% of pre-I levels, respectively). The presence of angiotensin II throughout IR had no effect on LV work compared with control. 4. Thus, angiotensin II reduces infarct size in a concentration-dependent manner but has no effect on contractile stunning associated with IR in isolated rat hearts.
Authors:
W R Ford; A S Clanachan; C R Hiley; B I Jugdutt
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of pharmacology     Volume:  134     ISSN:  0007-1188     ISO Abbreviation:  Br. J. Pharmacol.     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-08-27     Completed Date:  2001-10-11     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  7502536     Medline TA:  Br J Pharmacol     Country:  England    
Other Details:
Languages:  eng     Pagination:  38-45     Citation Subset:  IM    
Affiliation:
Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QJ, UK. wrf20@cam.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Angiotensin II / pharmacology*
Animals
Blood Pressure / drug effects
Coronary Circulation / drug effects
Dose-Response Relationship, Drug
Heart / drug effects*,  physiopathology
Heart Rate / drug effects
Heart Ventricles / drug effects,  physiopathology
Male
Myocardial Contraction / drug effects*
Myocardial Infarction / pathology,  physiopathology,  prevention & control*
Myocardial Ischemia / physiopathology*
Perfusion
Rats
Rats, Sprague-Dawley
Chemical
Reg. No./Substance:
11128-99-7/Angiotensin II
Comments/Corrections

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


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