title: Carba-prostacyclin inhibits 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced transformation in sensitive murine epidermal JB6 cells.
abstract: The ability of carba-prostacyclin (cPGI2), a stable analog of prostacyclin (PGI2), to inhibit 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced transformation of JB6 cells was investigated. JB6 cells sensitive (P+) and resistant (P-) to TPA-induced transformation to anchorage-independent growth were plated in soft agar in the presence or absence of cPGI2 for 14-21 days. Transformation frequencies were determined by recording colony numbers. cPGI2 was found to inhibit TPA-induced transformation of P+ cells in a dose-dependent fashion with 1 microM cPGI2 producing approximately 50% inhibition of colonies in soft agar. Our findings are consistent with the hypothesis that TPA-induced transformation in JB6 cell variants is mediated by PGI2 via regulation of adenylate cyclase activity and cAMP accumulation, with resultant inhibition of expression of the transformed phenotype, reflected in anchorage-independent growth.
authors.affiliation: University of Cincinnati Medical Center, Department of Environmental Health, OH 45267-0056.
authors.forename: J S
authors.initials: JS
authors.lastname: Smith
authors.forename: H E
authors.initials: HE
authors.lastname: Wey
authors.forename: G D
authors.initials: GD
authors.lastname: Leikauf
authors.forename: C S
authors.initials: CS
authors.lastname: Baxter
mesh_terms: D000818:Animals; D002448:Cell Adhesion / Q000187:drug effects / Q000502:physiology; D002471:Cell Transformation, Neoplastic / Q000187:drug effects*; D002478:Cells, Cultured; D000078404:Epidermal Cells; D004817:Epidermis / Q000187:drug effects; D011464:Epoprostenol / Q000031:analogs & derivatives* / Q000494:pharmacology; D007700:Kinetics; D051379:Mice; D012680:Sensitivity and Specificity; D013234:Stem Cells / Q000187:drug effects; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: C026678:carboprostacyclin; D011464:Epoprostenol; D013755:Tetradecanoylphorbol Acetate