title: Tissue inhibitor of metalloproteinase 1 is a negative regulator of the metastatic ability of a human gastric cancer cell line, KKLS, in the chick embryo.
abstract: Tissue inhibitors of metalloproteinases (TIMPs) are the negative regulators of matrix metalloproteinases that degrade extracellular matrix. We examined the regulatory role of TIMP-1 in the metastatic activity of human gastric cancer cell lines in chick embryos because unregulated matrix metalloproteinase activities are believed to be essential during metastatic processes. One of the nine cell lines examined, KKLS cells, formed metastatic colonies in the chick livers. These cells expressed undetectable levels of TIMP-1, and this was not inducible by 12-O-tetradecanoylphorbol 13-acetate. Derivatives of KKLS cells with different levels of TIMP-1 expression were prepared by transfection of the human TIMP-1 complementary DNA controlled by a simian virus 40 early promoter. Metastatic abilities were suppressed by almost 70% in the transfectants expressing high levels of TIMP-1. In contrast, no suppression was observed in the control transfectants or in cells expressing the transfected TIMP-1 gene at low levels. These data indicate that a reduced expression of TIMP-1 in KKLS cells is responsible for their consequent metastatic potential. Moreover, it suggests that matrix metalloproteinase enzymatic activities are a prerequisite for metastatic activity in this experimental model system.
authors.affiliation: Department of Molecular Virology and Oncology, Kanazawa University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tsuchiya
authors.forename: H
authors.initials: H
authors.lastname: Sato
authors.forename: Y
authors.initials: Y
authors.lastname: Endo
authors.forename: Y
authors.initials: Y
authors.lastname: Okada
authors.forename: M
authors.initials: M
authors.lastname: Mai
authors.forename: T
authors.initials: T
authors.lastname: Sasaki
authors.forename: M
authors.initials: M
authors.lastname: Seiki
mesh_terms: D000818:Animals; D001483:Base Sequence; D002642:Chick Embryo; D006023:Glycoproteins / Q000235:genetics / Q000502:physiology*; D006801:Humans; D008969:Molecular Sequence Data; D009362:Neoplasm Metastasis; D009368:Neoplasm Transplantation; D012333:RNA, Messenger / Q000032:analysis; D013274:Stomach Neoplasms / Q000737:chemistry / Q000473:pathology*; D019714:Tissue Inhibitor of Metalloproteinases; D014162:Transfection; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured
chemical_list: D006023:Glycoproteins; D012333:RNA, Messenger; D019714:Tissue Inhibitor of Metalloproteinases