Stimulation of the 92-kD type IV collagenase promoter and enzyme expression in human melanoma cells.
The 92-kD type IV collagenase is a member of the metalloproteinase family which degrades type IV collagen, a major component of basement membrane and is involved in tumor invasion and metastasis. The promoter and adjacent regulatory sequences of the 92-kD type IV collagenase have been identified previously and three cis-acting elements homologous to the binding sites for AP-1, NF-KB and SP-1 proteins contributed to induction of the promoter activity by 12-O-tetradecanoylphorbol 13-acetate (TPA) and tumor necrosis factor (TNF-alpha) in HT1080 cells. To date, no direct correlation between promoter activity and expression of the 92-kD type IV collagenase has been reported in normal or cancer cells. In this study, the effects of the transcriptional stimulation of the 92-kD type IV collagenase gene on the expression of the enzyme in human A2058 melanoma cells was analyzed by zymography experiments. Quantitative immunoblots using a monoclonal antibody that recognized specifically and exclusively the 92-kD type IV collagenase, confirmed that the 92-kD gelatinase was 92-kD type IV collagenase. Stimulation of the promoter activity resulted in increased gelatinase activity in the culture medium of A2058 cells. A direct correlation between TPA- and TNF-alpha-mediated promoter stimulation of the 92-kD type IV collagenase gene and its expression was also demonstrated in the human fibrosarcoma HT1080 cells. Interleukin-1 alpha failed to induce 92-kD gene promoter activity and type IV collagenase expression in melanoma and fibrosarcoma cell lines. Our data demonstrated that TPA- and TNF-alpha-induced 92-kD type IV collagenase promoter stimulation leads to a proportional increase of enzyme expression and secretion and thus could contribute to the activation of the invasive phenotype.
Lauricella-Lefebvre
M A
MA
Metastasis Research Laboratory, University of Liège, Belgium.
Castronovo
V
V
Sato
H
H
Seiki
M
M
French
D L
DL
Merville
M P
MP
D001483:Base Sequence; D017364:Collagenases / Q000235:genetics / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology; D020780:Matrix Metalloproteinase 9; D008545:Melanoma / Q000201:enzymology*; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha; D017364:Collagenases; D020780:Matrix Metalloproteinase 9; D013755:Tetradecanoylphorbol Acetate