Document Detail


Role of bradykinin in myocardial preconditioning.
MedLine Citation:
PMID:  8071859     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The role of bradykinin in the cardioprotective action of ischemic preconditioning was investigated in an anesthetized, open-chest rabbit model of acute coronary occlusion. A branch of the left main coronary artery was reversibly ligated to produce ischemia followed by reperfusion, after which the degree of myocardial necrosis (infarct size as a percent of area at risk) was assessed by tetrazolium staining. Before 30 min of coronary occlusion, rabbits received either ischemic preconditioning (5 min occlusion followed by 10 min reperfusion), no preconditioning, H-D-Arg-Arg-Pro-Hyp-Gly-Thi-Ser-D-Tic-Oic-Arg-OH (HOE 140) i.v. (bradykinin receptor antagonist, 1 micrograms/kg) plus preconditioning, HOE 140 alone, a 5-min intra-atrial bradykinin infusion (250 micrograms/kg/min) followed by a 10-min recovery period or HOE 140 plus bradykinin infusion with 10 min recovery. Systemic hemodynamic responses were similar between treatment groups except that both bradykinin infusion groups had a significantly depressed rate of left ventricular pressure development (LV+dP/dtmax) after the 10-min recovery period. Preconditioning reduced infarct size significantly (12 +/- 2%, compared to non-preconditioned controls at 41 +/- 6%), whereas pretreatment with HOE 140 abolished the cardioprotective effect (41 +/- 4%). In addition, bradykinin infusion reduced infarct size significantly (16 +/- 1%), an effect which was also prevented by HOE 140 (41 +/- 5%). HOE 140 alone did not exacerbate the degree of myocardial necrosis (43 +/- 4%). Myocardial area at risk as a percentage of total left ventricular mass was not different between the six treatment groups. The results indicate that endogenously generated bradykinin may mediate the cardioprotective events associated with ischemic preconditioning.
Authors:
T M Wall; R Sheehy; J C Hartman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of pharmacology and experimental therapeutics     Volume:  270     ISSN:  0022-3565     ISO Abbreviation:  J. Pharmacol. Exp. Ther.     Publication Date:  1994 Aug 
Date Detail:
Created Date:  1994-09-28     Completed Date:  1994-09-28     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0376362     Medline TA:  J Pharmacol Exp Ther     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  681-9     Citation Subset:  IM    
Affiliation:
Cardiovascular Diseases Research Unit, Upjohn Laboratories, Upjohn Company, Kalamazoo, Michigan.
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MeSH Terms
Descriptor/Qualifier:
Amino Acid Sequence
Animals
Bradykinin / analogs & derivatives,  pharmacology,  physiology*
Female
Heart / drug effects
Hemodynamics / drug effects
Male
Molecular Sequence Data
Myocardial Ischemia / physiopathology*
Myocardial Reperfusion Injury / physiopathology*,  prevention & control
Rabbits
Chemical
Reg. No./Substance:
130308-48-4/icatibant; 58-82-2/Bradykinin

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


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