title: High collagenolytic activity in spontaneously highly metastatic variants derived from a human pancreatic cancer cell line (SUIT-2) in nude mice.
abstract: Cell lines with high metastatic capacity to the lung were established by sequential passage of a human pancreatic cancer cell line (SUIT-2) through the lung of a nude mouse, via the lateral tail vein and from a subcutaneous inoculum. Cells of the parental SUIT-2 and sublines S2-VPx (x-cycle selection from SUIT-2 cells, by Vein-Pulmonary metastasis-culture) and S2-CPx (x-cycle selection, by Cutis-Pulmonary metastasis-culture) were injected intravenously or subcutaneously into nude mice to produce experimental or spontaneous lung metastasis. The S2-VP10 cell line produced pulmonary metastases in 100% of the nude mice, when injected intravenously. It failed, however, to produce more lung colonies than its parent cell line, when injected subcutaneously. The S2-CP8 cell line produced extensive pulmonary metastases in 100% of the nude mice, when injected either intravenously or subcutaneously. This study indicates that the nude mouse provided a good model for in vivo selection of metastatic cells from SUIT-2 cells both experimentally and spontaneously, and that the SUIT-2, S2-VPx, and S2-CPx cell lines will be valuable in the study of human cancer metastasis. We previously reported high levels of ezrin expression in the S2-VP10 and S2-CP8 cell lines. Here we show that these cell lines exhibit a greater capacity to invade or attach to various extracellular matrix components than the parent SUIT-2 cells. The S2-CP8 cell lines also exhibit greater level of type-I and type-IV collagen-degrading activity than the parent SUIT-2 cell line and the S2-VP10 cell line, which shows similar collagen-degrading activity to the parent SUIT-2 cells. In RT-PCR studies, SUIT-2, S2-CP8 and S2-VP10 cell lines constitutively expressed many matrix metalloproteinases (MMP-1, MMP-2, MMP-3, MMP7, MMP-9, MMP-10 and MMP-14). These results suggest that some parameters that enhance adhesion and invasion are important to both experimental and spontaneous metastasis and the collagen degrading enzymes are predicted to play a key-role during spontaneous metastasis.
authors.affiliation: Department of Surgery 1, Miyazaki Medical College, Kiyotake, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kitamura
authors.forename: T
authors.initials: T
authors.lastname: Iwamura
authors.forename: S
authors.initials: S
authors.lastname: Taniguchi
authors.forename: H
authors.initials: H
authors.lastname: Yamanari
authors.forename: M A
authors.initials: MA
authors.lastname: Kawano
authors.forename: K
authors.initials: K
authors.lastname: Hollingsworth
authors.forename: T
authors.initials: T
authors.lastname: Setoguchi
mesh_terms: D000818:Animals; D002448:Cell Adhesion; D002455:Cell Division; D003094:Collagen / Q000378:metabolism*; D024042:Collagen Type I / Q000378:metabolism; D024141:Collagen Type IV / Q000378:metabolism; D005260:Female; D006801:Humans; D007700:Kinetics; D008175:Lung Neoplasms / Q000556:secondary*; D020782:Matrix Metalloproteinases / Q000096:biosynthesis / Q000235:genetics; D051379:Mice; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D010190:Pancreatic Neoplasms / Q000201:enzymology* / Q000235:genetics / Q000473:pathology; D019714:Tissue Inhibitor of Metalloproteinases / Q000096:biosynthesis / Q000235:genetics; D014407:Tumor Cells, Cultured
chemical_list: D024042:Collagen Type I; D024141:Collagen Type IV; D019714:Tissue Inhibitor of Metalloproteinases; D003094:Collagen; D020782:Matrix Metalloproteinases