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Increased matrix metalloproteinase-9 (MMP-9) activity observed in chronic wound fluid is related to the clinical severity of the ulcer

Rayment, Erin A., Upton, Zee, & Shooter, Gary K. (2008) Increased matrix metalloproteinase-9 (MMP-9) activity observed in chronic wound fluid is related to the clinical severity of the ulcer. British Journal of Dermatology, 158(5), pp. 951-961.

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Abstract

BACKGROUND: The pathology of chronic wounds is often characterized by elevated levels of proinflammatory cytokines [e.g. tumour necrosis factor (TNF)-alpha and interleukin (IL)-1beta], proteases [e.g. matrix metalloproteinases (MMPs)] and neutrophil elastase. MMPs specifically have been implicated by a number of studies as the major protease family responsible for the degradation of key factors critical to the ulcer's ability to heal. OBJECTIVES: To assess individual MMPs in chronic wound fluid (CWF) in order to develop improved treatments for chronic ulcers. METHODS: Collagen type I and IV zymography, immunoprecipitation followed by a substrate activity assay, and an indirect enzyme-linked immunosorbent assay were all used to analyse MMP levels in CWF. RESULTS: Our studies demonstrate that there is excessive protease activity in CWF compared with both human serum and acute wound fluid (AWF), which can be specifically attributed to MMPs as determined through a MMP-inhibitor study. Multiple MMPs were immunoprecipitated from the CWF samples and MMP-9 was identified as the predominant protease in CWF, with significantly elevated activity levels in CWF compared with AWF. In addition, the clinical status of the ulcer is directly associated with the amounts of MMP-9 present in the wound fluid. Therefore, this study suggests that higher levels of MMP-9 in chronic wound fluid correlate with a clinically worse wound. CONCLUSIONS: In view of these results, it is hypothesized that a specific inhibitor of MMP-9 could potentially be more therapeutically effective than general MMP inhibitors in modulating chronic ulcers towards a healing state.

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ID Code: 13683
Item Type: Journal Article
Keywords: IHBI, Tissue Repair and Regeneration Program, rayment, upton, shooter, wound healing, chronic leg ulcer, gelatinase, B, matrix metalloproteinase
DOI: 10.1111/j.1365-2133.2008.08462.x
ISSN: 1365-2133
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100) > Cellular Interactions (incl. Adhesion Matrix Cell Wall) (060106)
Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100) > Biochemistry and Cell Biology not elsewhere classified (060199)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2008 Blackwell Publishing
Copyright Statement: The definitive version is available at www.blackwell-synergy.com
Deposited On: 10 Jun 2008
Last Modified: 29 Feb 2012 23:51

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