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Effects of acute angiotensin II on ischemia reperfusion injury following myocardial infarction.
MedLine Citation:
PMID:  25487980     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Myocardial infarction (MI) induces cardiac remodeling. This may increase the susceptibility of the infarcted heart to subsequent ischemic events. While chronic angiotensin II blockade is cardioprotective post-MI, the acute effects of angiotensin II in ischemia-reperfusion injury (IR) remains unclear. In the present study, we tested whether angiotensin II administration altered recovery of left ventricular (LV) function to IR in hearts from sham and MI rats. Echocardiography, LV pressure-volume relationships, and IR performance were established in subsets of sham (N = 27) and MI hearts (N = 41). IR was conducted in red-cell-perfused Langendorff hearts (60 minutes of low-flow ischemia; 30 minutes of reperfusion) during vehicle or angiotensin II infusions (10(-7) M). MI hearts were dilated and had reduced fractional shortening and blunted systolic elastance (p < 0.05). Despite systolic dysfunction in MI, functional recovery to IR was similar to sham. Angiotensin II significantly worsened IR performance in sham (p < 0.05), but not MI. The effect of angiotensin II on in vitro cardiomyocyte survival under various pH conditions was also tested. Acidosis increased cardiomyocyte death and angiotensin II potentiated this effect. We conclude that IR performance is similar between sham and MI hearts and that MI hearts are resistant to angiotensin II-induced cardiac dysfunction in response to IR.
Authors:
Sarah Mann; Akinyemi Bajulaiye; Kathleen Sturgeon; Abdelkarim Sabri; Geetha Muthukumaran; Joseph R Libonati
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-12-8
Journal Detail:
Title:  Journal of the renin-angiotensin-aldosterone system : JRAAS     Volume:  -     ISSN:  1752-8976     ISO Abbreviation:  J Renin Angiotensin Aldosterone Syst     Publication Date:  2014 Dec 
Date Detail:
Created Date:  2014-12-9     Completed Date:  -     Revised Date:  2014-12-10    
Medline Journal Info:
Nlm Unique ID:  100971636     Medline TA:  J Renin Angiotensin Aldosterone Syst     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© The Author(s) 2014.
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