title: The effects of phorbol ester and Ca ionophore on c-fos and c-myc expression and on DNA synthesis in human lymphocytes are not directly related.
abstract: Phorbol ester activates human lymphocyte proliferation as measured by [3H]thymidine incorporation and blast transformation. Phorbol ester and calcium ionophore A 23187 induce c-fos and c-myc expression in these cells as shown by the measure of the specific mRNA levels and of the c-fos nuclear protein amount. The combination of these two agents has a synergistic effect on c-fos but not on c-myc expression. Lymphocyte stimulation by phorbol ester for a short time induces c-fos and c-myc expression, but has no effect on [3H]thymidine incorporation. This result indicates that the induction of c-fos and c-myc expression is not sufficient to commit these cells to DNA synthesis.
mesh_terms: D000328:Adult; D000001:Calcimycin / Q000494:pharmacology*; D002478:Cells, Cultured; D004261:DNA Replication / Q000187:drug effects*; D006801:Humans; D007700:Kinetics; D008214:Lymphocytes / Q000187:drug effects / Q000378:metabolism*; D011519:Proto-Oncogenes / Q000187:drug effects*; D012333:RNA, Messenger / Q000187:drug effects / Q000235:genetics*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014158:Transcription, Genetic / Q000187:drug effects*
chemical_list: D012333:RNA, Messenger; D000001:Calcimycin; D013755:Tetradecanoylphorbol Acetate