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KMID : 0379519980140040569
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한국독성학회지
1998 Volume.14 No. 4 p.569 ~ p.575
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Roles of Matrix Metalloproteinase-2 and -9 on the H-ras-Induced Invasive Phenotype in Human Breast Epithelial Cells and Human Fibrosarcoma Cells
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Kim Mi-Sung
Won Ju-Hye
Moon Aree
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Abstract
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One of the most frequent dejects in human cancer is the uncontrolled activation of the ms-signaling pathways. Significant evidence has accumulated to directly implicate members of the matrix metalloproteinases (MMPs) in tumor invasion and metastasis formation. We have previously shown that MMP-9 expression was significantly enhanced in the ras-tranfected HT1080 human fibrosarcoma cells at the mRNA level. In the present study, we investigated the roles of MMP-2 and -9 on the H-ras-induced invasive phenotypes of MCF 10A human breast epithelial cells and HT 1080 human fibrosarcoma cells. We show that H-ras is able to induce or enhance a signaling pathway leading to the enhancement of an invasive phenotype in both MCF10A and HT1080 cells as determined by matrigel invasion assay. We then examined the effect of H-ras activation on the expression of MMP-2 and -9 by measuring enzymatic activities and mRNA levels. Our data clearly demonstrated that H-ras prominently induces expression of MMP-2 in MCF10A cells, while it efficiently up regulates MMP-9 in HT1080 cells. Taken together, these findings suggest that the correlation between ras-mediated invasiveness and enhanced expression of MMPs may be cell type-specific: MMP-9 is closely associated with the invasive phenotype induced by ras activation in fibrosarcoma cells, whereas MMP-2 is more likely associated with it in epithelial cells.
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KEYWORD
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Ras oncogene, Matrix metalloproteinase (MMP), Invasive phenotype, Human breast epithelial cells, Humanfibrosarcoma cells
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