title: Enhanced production of matrix metalloproteinases and activation of matrix metalloproteinase 2 (gelatinase A) in human gastric carcinomas.
abstract: We examined the production and tissue localization of matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) in gastric carcinoma tissues. MMP-1 (tissue collagenase), MMP-9 (gelatinase B) and TIMP-2 were immunolocalized in carcinoma cells and MMP-2 (gelatinase A) on tumor cell membranes, whereas no or little immunostaining for MMP-3 (stromelysin-1) and TIMP-1 was seen in carcinoma cells. Stromal cells in carcinoma tissue were also positively stained for these MMPs and TIMPs. MMP-2 immunostaining was observed exclusively on advanced gastric carcinoma cells and correlated with vascular invasion by tumor cells. Sandwich enzyme immunoassays revealed enhanced production of MMP-1, MMP-2, MMP-3, MMP-9 and TIMP-1 by carcinoma tissues. Gelatinolytic activities were significantly higher in carcinoma samples than in normal controls. Using gelatin zymography, active forms of MMP-2 and MMP-9 were more frequently detected in carcinoma tissue, and the activation rate of the zymogen of MMP-2 (proMMP-2), but not that of proMMP-9, correlated well with degree of local invasion and lymphatic permeation. Our data indicate an enhanced production of 4 MMPs in gastric carcinoma tissue and suggest that activation of pro-MMP-2 may be a key step for spreading of gastric carcinoma cells.
authors.affiliation: Department of Molecular Immunology, Cancer Research Institute, Kanazawa University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nomura
authors.forename: N
authors.initials: N
authors.lastname: Fujimoto
authors.forename: M
authors.initials: M
authors.lastname: Seiki
authors.forename: M
authors.initials: M
authors.lastname: Mai
authors.forename: Y
authors.initials: Y
authors.lastname: Okada
mesh_terms: D004789:Enzyme Activation; D004792:Enzyme Precursors / Q000378:metabolism; D018093:Gelatinases / Q000378:metabolism*; D006023:Glycoproteins / Q000096:biosynthesis; D006801:Humans; D007124:Immunoenzyme Techniques; D007150:Immunohistochemistry; D020778:Matrix Metalloproteinase 2; D008666:Metalloendopeptidases / Q000096:biosynthesis* / Q000378:metabolism*; D014176:Protein Biosynthesis; D013274:Stomach Neoplasms / Q000201:enzymology* / Q000473:pathology; D019716:Tissue Inhibitor of Metalloproteinase-2; D019714:Tissue Inhibitor of Metalloproteinases
chemical_list: D004792:Enzyme Precursors; D006023:Glycoproteins; D019714:Tissue Inhibitor of Metalloproteinases; D019716:Tissue Inhibitor of Metalloproteinase-2; D018093:Gelatinases; D008666:Metalloendopeptidases; D020778:Matrix Metalloproteinase 2