title: Characterization of a human teratocarcinoma cell assay for inhibitors of metabolic cooperation.
abstract: Although a Chinese hamster V79 cell-based assay for inhibitors of metabolic cooperation is currently available, the development of a human cell-based assay is desirable in order to avoid inappropriate extrapolation from animal cells to human cells. Cells derived from a human teratocarcinoma cell line (designated PA-1), which has a stable pseudodiploid karyotype and excellent in vitro growth properties, were used in a metabolic cooperation assay. The assay was based on the metabolic isolation of hypoxanthine-guanine phosphoribosyltransferase (HGPRT)-deficient variants in the presence of HGPRT-proficient cells and 6-thioguanine. Chemicals which inhibit the transfer of the lethal metabolite of 6-thioguanine from HGPRT-proficient to HGPRT-deficient cells will allow for recovery of the 6-thioguanine-resistant (HGPRT-deficient) cells. Chemicals tested included 12-O-tetradecanoylphorbol-13-acetate and related analogues phorbol-12,13-didecanoate, mezerein, and 4-phorbol-12,13-didecanoate. Concurring with results previously obtained in V79 cells, 12-O-tetradecanoylphorbol-13-acetate and phorbol-12,13-didecanoate strongly inhibited metabolic cooperation, whereas mezerein was moderately inhibitory and 4 alpha-phorbol-12,13-didecanoate was inactive. These cells thus hold promise as a human cell-based assay for inhibitors of metabolic cooperation.
mesh_terms: D001681:Biological Assay; D002450:Cell Communication / Q000187:drug effects*; D004224:Diterpenes; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000378:metabolism; D007365:Intercellular Junctions / Q000502:physiology*; D007621:Karyotyping; D010703:Phorbol Esters / Q000494:pharmacology*; D013724:Teratoma / Q000378:metabolism* / Q000473:pathology; D013729:Terpenes / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D004224:Diterpenes; D010703:Phorbol Esters; D013729:Terpenes; C011309:mezerein; D007041:Hypoxanthine Phosphoribosyltransferase; D013755:Tetradecanoylphorbol Acetate