PMID: 9438380Jan 23, 1998Paper

Human microvascular endothelial cells differ from macrovascular endothelial cells in their expression of matrix metalloproteinases

The International Journal of Biochemistry & Cell Biology
C J Jackson, M Nguyen

Abstract

Matrix metalloproteinase (MMP) secretion by microvascular endothelial cells is an essential first step in the formation of new blood vessels (angiogenesis). Since angiogenesis does not occur in large blood vessels, we investigated whether the secretion of MMPs and tissue inhibitor of MMP (TIMP1) differs between micro- and macro-vascular endothelial cells. We compared the secretion of MMPs and TIMP1 by human endothelial cells derived from neonatal foreskin (FSE) and umbilical vein (HUVE) sources. The cells were incubated for 24 hr in the presence or absence of the angiogenic agents, phorbol myristate acetate (PMA, 100 ng/ml) or tumour necrosis factor-alpha (TNF, 100 ng/ml). The cell supernatants were removed and assayed for MMPs and TIMP1 using a spectrophotometric assay for MMP1, zymography, Western blotting and Northern analysis. When endothelial cells were incubated in basal medium for 24 hr they secreted MMP1, MMP2 and TIMP1 but not MMP9. HUVE secreted substantially higher levels of these proteins compared to FSE. In addition, HUVE secreted two low molecular mass bands representing activated forms of MMP2. These activated forms were not present in supernatants derived from FSE. In response to PMA, both FSE and HUVE increased...Continue Reading

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