title: Co-expression of urokinase-type plasminogen activator and its receptor in human gastric-cancer cell lines correlates with their invasiveness and tumorigenicity.
abstract: The expression of urokinase-type plasminogen activator (u-PA), its receptor (u-PAR) and metalloproteases activity were analyzed in 4 human gastric-cancer cell lines (AGS, Hs746T, SNU-1, and SNU-5), in an attempt to relate these activities to their invasive potential and tumorigenicity on the modified chorioallantoic membranes (CAM) of chick embryos. Only 1 of the 4 cell lines tested, Hs746T, expressed both u-PA and u-PAR as well as MMP-2, but not MMP-9. This cell line was both tumorigenic and highly invasive (51.3 +/- 13.1%) on a modified CAM. Its invasive capacity was comparable with that of a highly malignant human epidermoid-carcinoma cell line (HEp3), which usually showed 40 to 50% invasiveness. The 3 other cell lines all produced MMP-2 and MMP-9, but only AGS showed moderate invasiveness (24.2 +/- 8.8%). While antibodies to u-PA were significantly effective in reducing CAM invasiveness of Hs746T cells by approximately 40%, the invasiveness of the t-PA-expressing AGS cell line was not affected by anti-t-PA antibodies. These results suggest that when one of the components of the u-PA/u-PAR system (the enzyme and/or the receptor) is not produced and u-PA/u-PAR-dependent cell-surface proteolytic activity is thereby diminished, the malignant phenotype that can be determined by tumorigenicity and invasion of connective tissue on a CAM is compromised. Production of both type-IV collagenases (MMP-2 and MMP-9) cannot offset this deficiency.
authors.affiliation: Department of Microbiology and Cancer Research Center, Seoul National University College of Medicine, Republic of Korea.
authors.forename: I K
authors.initials: IK
authors.lastname: Park
authors.forename: B J
authors.initials: BJ
authors.lastname: Kim
authors.forename: Y J
authors.initials: YJ
authors.lastname: Goh
authors.forename: M A
authors.initials: MA
authors.lastname: Lyu
authors.forename: C G
authors.initials: CG
authors.lastname: Park
authors.forename: E S
authors.initials: ES
authors.lastname: Hwang
authors.forename: Y H
authors.initials: YH
authors.lastname: Kook
mesh_terms: D000818:Animals; D015152:Blotting, Northern; D002642:Chick Embryo; D017364:Collagenases / Q000235:genetics; D018093:Gelatinases / Q000235:genetics; D015870:Gene Expression; D006801:Humans; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D008666:Metalloendopeptidases / Q000235:genetics; D009361:Neoplasm Invasiveness; D011956:Receptors, Cell Surface / Q000235:genetics*; D055293:Receptors, Urokinase Plasminogen Activator; D013274:Stomach Neoplasms / Q000201:enzymology* / Q000473:pathology*; D010959:Tissue Plasminogen Activator / Q000037:antagonists & inhibitors / Q000502:physiology; D014407:Tumor Cells, Cultured; D014568:Urokinase-Type Plasminogen Activator / Q000235:genetics*
chemical_list: C524898:PLAUR protein, human; D011956:Receptors, Cell Surface; D055293:Receptors, Urokinase Plasminogen Activator; D010959:Tissue Plasminogen Activator; D014568:Urokinase-Type Plasminogen Activator; D017364:Collagenases; D018093:Gelatinases; D008666:Metalloendopeptidases; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9