title: Effect of tight junctional resistance on penetration of LLC-PK1 epithelial cell layers by metastatic B16-F10 melanoma cells.
abstract: The relationship between tight junctional resistance of a tissue and its penetration by metastatic cells was examined in vitro using LLC-PK1 cells, an epithelial cell line derived from pig kidney, and B16-F10 cells, a murine melanoma cell line metastatic in syngeneic C57BL/6 mice. When grown to confluence on 8.0-microns pore size polycarbonate filters, LLC-PK1 cells formed tight junctions between adjacent cells which offered an electrical resistance to a nondestructive 20-mu ampere alternating current passed across the cell layer. B16-F10 cells seeded on top of an LLC-PK1 epithelial layer with a measured transepithelial resistance of approximately 300 omega x cm2 were unable to penetrate the epithelial barrier. The tumor-promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) lowered the electrical resistance of the epithelial layer by 80% and simultaneously opened the epithelial barrier to penetration by metastatic cells.
authors.affiliation: Department of Cell Biology, Lankenau Medical Research Center, Philadelphia, Pennsylvania 19151.
authors.forename: K G
authors.initials: KG
authors.lastname: Conn
authors.forename: K A
authors.initials: KA
authors.lastname: Knudsen
mesh_terms: D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D004553:Electric Conductivity; D004848:Epithelium / Q000187:drug effects / Q000473:pathology; D007365:Intercellular Junctions / Q000187:drug effects / Q000473:pathology*; D008546:Melanoma, Experimental / Q000473:pathology*; D008856:Microscopy, Fluorescence; D009362:Neoplasm Metastasis; D013552:Swine; D013755:Tetradecanoylphorbol Acetate / Q000633:toxicity; D014407:Tumor Cells, Cultured
chemical_list: D013755:Tetradecanoylphorbol Acetate