title: Rapid induction of the expression of proto-oncogene fos during human monocytic differentiation.
abstract: The differentiation into macrophages of the monocytic cell line U-937 or the monomyelocytic cell line HL-60 induced by phorbol esters is accompanied by a rapid induction of the expression of the proto-oncogene c-fos. Maximal levels of c-fos gene transcripts accumulate within 20-30 min following induction. By 2 hr, the c-fos-specific mRNA level drops 5 to 10 fold below that detected at 30 min after induction. The concentration of c-fos mRNA remains unchanged for the next 5 days, at which time over 99% of the viable precursor cells are converted to adherent macrophages. c-fos protein can be detected within 20 min of induction, reaching maximal levels by 40-60 min. Little or no c-fos protein is detected by 120-150 min after induction, even though c-fos mRNA remains detectable. Presence of cycloheximide leads to superinduction of c-fos mRNA transcripts. No c-fos gene transcripts are detected when the HL-60 cell line is induced with Me2SO to differentiate to granulocytes. A role for the c-fos protein is envisaged in the monocyte differentiation pathway.
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D005455:Fluorescent Antibody Technique; D005796:Genes; D006801:Humans; D015470:Leukemia, Myeloid, Acute; D008264:Macrophages / Q000166:cytology; D009363:Neoplasm Proteins / Q000235:genetics; D009857:Oncogenes; D014176:Protein Biosynthesis; D000090063:Proto-Oncogene Mas; D012334:RNA, Neoplasm / Q000302:isolation & purification; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014158:Transcription, Genetic
chemical_list: C000715470:MAS1 protein, human; D009363:Neoplasm Proteins; D000090063:Proto-Oncogene Mas; D012334:RNA, Neoplasm; D013755:Tetradecanoylphorbol Acetate; D004121:Dimethyl Sulfoxide