Expression and activity of matrix metalloproteases in human malignant mesothelioma cell lines.
The extracellular matrix metalloproteases (MMPs) secreted by various human tumor cells play a crucial role in tumor cell invasion and metastasis, but their expression in malignant mesothelioma (MM) cells has not been examined. In this study, we have investigated the spectrum of MMPs and tissue inhibitors of metalloproteases (TIMPs) produced by 8 MM cell lines. Using RT-PCR, we found that all investigated MM cell lines expressed genes encoding mRNA for MMP-1 (interstitial collagenase), MMP-2 (gelatinase A), MMP-3 (stromelysin-1), MMP-9 (gelatinase B) and TIMPs 1, 2 and 3. We also found that 6/8 MM cell lines expressed MMP-7 (matrilysin) and 3/8 MM cell lines expressed MMP-10 (stromelysin-2). MMP-11 (stromelysin-3) was not detected in any of the MM cell lines. Production of MMP-2 and MMP-9 was confirmed using gelatin zymography. In addition, all MM cell lines secreted a 66 kDa metalloprotease, while 3/8 MM cell lines secreted 46, 48, 51 and 63 kDa metalloproteases which specifically degraded the extracellular matrix components fibronectin, vitronectin and laminin. The 66 kDa protease was identified as MMP-3 by Western blot. Our results reveal a broad spectrum of MMPs and TIMPs produced by MM cells and indicate that different substrate specificities of MMPs may play a role in MM cell invasion.
Liu
Z
Z
Department of Clinical Immunology, Karolinska Institute at Huddinge University Hospital, Huddinge, Sweden.
Ivanoff
A
A
Klominek
J
J
D015153:Blotting, Western; D016895:Culture Media, Serum-Free; D018076:DNA, Complementary / Q000378:metabolism; D005353:Fibronectins / Q000378:metabolism; D006801:Humans; D007797:Laminin / Q000378:metabolism; D020781:Matrix Metalloproteinase 1 / Q000096:biosynthesis; D053506:Matrix Metalloproteinase 10; D053507:Matrix Metalloproteinase 11; D020778:Matrix Metalloproteinase 2 / Q000096:biosynthesis; D019278:Matrix Metalloproteinase 3 / Q000096:biosynthesis; D020783:Matrix Metalloproteinase 7 / Q000096:biosynthesis; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis; D020782:Matrix Metalloproteinases / Q000096:biosynthesis*; D008654:Mesothelioma / Q000201:enzymology*; D008666:Metalloendopeptidases / Q000096:biosynthesis; D009361:Neoplasm Invasiveness; D011480:Protease Inhibitors / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013379:Substrate Specificity; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000096:biosynthesis; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000096:biosynthesis; D019717:Tissue Inhibitor of Metalloproteinase-3 / Q000096:biosynthesis; D014407:Tumor Cells, Cultured; D019096:Vitronectin / Q000378:metabolism
D016895:Culture Media, Serum-Free; D018076:DNA, Complementary; D005353:Fibronectins; D007797:Laminin; D011480:Protease Inhibitors; D019715:Tissue Inhibitor of Metalloproteinase-1; D019717:Tissue Inhibitor of Metalloproteinase-3; D019096:Vitronectin; D019716:Tissue Inhibitor of Metalloproteinase-2; D012313:RNA; D053507:Matrix Metalloproteinase 11; D020782:Matrix Metalloproteinases; D008666:Metalloendopeptidases; D019278:Matrix Metalloproteinase 3; D053506:Matrix Metalloproteinase 10; D020783:Matrix Metalloproteinase 7; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D020781:Matrix Metalloproteinase 1