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(Circulation. 2001;103:2181.)
© 2001 American Heart Association, Inc.
Basic Science Reports |
From the Section of Cardiovascular Sciences, DeBakey Heart Center, Department of Medicine, Methodist Hospital (M.L., K.W., C.K., A.J.E., A.R.B., L.M., M.E.); Immunology Research Laboratory and Research Center for AIDS and HIV Infections at the Houston Veterans Affairs Medical Center (M.D.B., R.D.R.); Speros P. Martel Laboratory of Leukocyte Biology at Texas Childrens Hospital (J.S.); and the Departments of Medicine, Microbiology and Immunology, and Pediatrics, Baylor College of Medicine (all authors), Houston, Tex.
Correspondence to Mark L. Entman, MD, Chief, Cardiovascular Sciences, Department of Medicine, One Baylor Plaza, MS F602, Houston, TX 77030. E-mail mentman{at}bcm.tmc.edu
BackgroundA key component of reperfusion of myocardial infarction is an immediate inflammatory response, which enhances tissue repair. Matrix turnover is crucial to tissue repair, and matrix metalloproteinases (MMPs) are key enzymes involved in matrix degradation. The hypothesis tested is that one inflammation-based effector of tissue repair is the secretion and activation of MMP-9 by infiltrating neutrophils.
Methods and ResultsCardiac lymph and tissue were assayed for latent and active MMP-2 and MMP-9 by zymography and immunochemistry. Dual-labeling immunofluorescence determined the cellular source of MMP-9 protein. Isolated canine neutrophils were incubated with preischemic and postischemic cardiac lymph in the presence and absence of collagen-fibronectin pads, and the supernatants were assayed for latent and active MMP-9. MMP-9 increased during the first hours of reperfusion in both lymph supernatants and myocardial extracts, and this increase was of neutrophil origin. MMP-9 in the cardiac lymph remained latent but was activatable. In contrast, MMP-9 in the myocardium was in both latent and active forms. In situ zymography demonstrated that activated MMP-9 surrounded the infiltrated neutrophils. When postischemic cardiac lymph was incubated with neutrophils in vitro, MMP-9 secretion and activation occurred only in the presence of a collagen-fibronectin substrate; preischemic cardiac lymph did not induce significant secretion or activation.
ConclusionsInfiltrating neutrophils are an early source of MMP-9 after reperfusion, and a portion of MMP-9 in the myocardium is active. Infiltrating neutrophils may localize MMP-9 activation by secreting MMP-9 and as a source of activating proteases.
Key Words: metalloproteinases ischemia reperfusion blood cells
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