Matrix metalloproteinase-8 and -9 are increased at the site of abdominal aortic aneurysm rupture

Richard W. Wilson, Marcus Anderton, Edward C. Schwalbe, J. Louise Jones, Peter N. Furness, Peter R.F. Bell, Matthew M. Thompson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

199 Citations (Scopus)


BACKGROUND-: Abdominal aortic aneurysm (AAA) expansion is characterized by extracellular matrix degradation and widespread inflammation. In contrast, the processes that characterize AAA rupture are not well understood. The aim of this study was to investigate the proteolytic and cellular activity of ruptured AAA, focusing on matrix metalloproteinases (MMPs) and their inhibitors (TIMPs).

 METHODS AND RESULTS-: Anterior aneurysm wall biopsies were taken from 55 nonruptured and 21 ruptured AAAs. A further biopsy from the site of rupture was taken from 12 of the ruptured AAAs. MMP-1, -2, -3, -8, -9, and -13, as well as TIMP-1 and -2, were quantified in each biopsy with ELISA. A comparison of anterior aneurysm biopsies showed no difference in MMP or TIMP concentrations between nonruptured and ruptured AAA. In a comparison of ruptured AAA biopsies, MMP-8 and -9 levels were significantly elevated in the 12 rupture site biopsies compared with their 12 paired anterior wall biopsies, whereas other MMPs and TIMPs showed no difference (MMP-8, P<0.001; MMP-9, P=0.01). MMP-8 and -9 expression was mediated by native mesenchymal cells and was independent of the inflammatory infiltrate. 

CONCLUSIONS-: A localized increase in MMP-8 and -9, mediated by native mesenchymal cells, presents a potential pathway for collagen breakdown and AAA rupture.

Original languageEnglish
Pages (from-to)438-445
Number of pages8
Issue number3
Publication statusPublished - 24 Jan 2006
Externally publishedYes

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