Restricted expression of membrane type 1-matrix metalloproteinase by myofibroblasts adjacent to human breast cancer cells.
Fiche publication
Date publication
mai 2003
Journal
International journal of cancer
Auteurs
Membres identifiés du Cancéropôle Est :
Pr POLETTE Myriam
Tous les auteurs :
Bisson C, Blacher S, Polette M, Blanc JF, Kebers F, Desreux J, Tetu B, Rosenbaum J, Foidart JM, Birembaut P, Noel A
Lien Pubmed
Résumé
The membrane type-1 matrix metalloproteinase (MT1-MMP), a protease originally identified in breast carcinoma, is characterized by its capacity to activate other MMPs (MMP-2 and MMP-13) and to degrade extracellular matrix. Our study was undertaken to localize and identify the MT1-MMP expressing cells in human breast adenocarcinomas. A textural analysis of images obtained by immunohistochemistry and in situ hybridization showed precisely the co-expression of alpha smooth muscle actin (alphaSM actin) and MT1-MMP in myofibroblasts. MT1-MMP expression is confined to myofibroblasts in close contact with tumor cells. In sharp contrast, the expression of MMP-2 was more widely distributed in both alphaSM actin positive and negative cells close to and at distance from cancer cell clusters. Our in vitro observations are consistent with the higher level of MT1-MMP expression and of MMP-2 activation observed in alphaSM actin positive fibroblasts derived from breast tumors, as compared to normal breast fibroblasts. Collectively, these results implicate myofibroblasts as major producer of MT1-MMP in breast cancer and emphasize the importance of stromal-epithelial cell interactions in their progression.
Mots clés
Actins, biosynthesis, Adenocarcinoma, enzymology, Blotting, Western, Breast Neoplasms, enzymology, Collagenases, metabolism, Culture Media, Conditioned, pharmacology, Disease Progression, Enzyme Activation, Epithelial Cells, cytology, Fibroblasts, enzymology, Gene Expression Regulation, Enzymologic, Humans, Immunohistochemistry, In Situ Hybridization, Matrix Metalloproteinase 1, metabolism, Matrix Metalloproteinase 11, Matrix Metalloproteinase 13, Matrix Metalloproteinase 2, metabolism, Metalloendopeptidases, metabolism, Microscopy, Fluorescence, Muscle, Smooth, metabolism, Neoplasms, pathology, RNA, Messenger, metabolism, Stromal Cells, cytology, Tumor Cells, Cultured
Référence
Int. J. Cancer. 2003 May;105(1):7-13