title: Macrophage differentiation of human precursor B-cell line by phorbol ester and colony-stimulating factor.
abstract: A human round cell line, KLM-2, is considered to be precursor B-cell by immunologic surface marker analysis and histochemical studies. The effect of 12-O-tetradecanoyl phorbol-13-acetate (TPA) and/or colony-stimulating factor (CSF) on KLM-2 cells was investigated. KLM-2 cells became adherent to the bottom of the flask on day 2 after liquid culture with TPA, and the number of macrophage-like adherent cells (mAC) with pseudopodia showed a TPA dose-dependent increase to the peak level on day 3 or 4. The mAC had a phagocytic activity. The suspending cells were positive for alpha-naphthyl acetate esterase (NAE) up to about 50% in culture with TPA. A TPA concentration of 100 ng/ml was optimal to provide a maximum number of mAC and NAE-positive suspending cells. Particularly, such effects of TPA on KLM-2 cells were markedly accelerated in the presence of CSF. These findings indicate macrophage differentiation of KLM-2 cells in the presence of TPA and CSF. KLM-2 cells may be a bipotential stem cell line differentiating into B-cell and monocyte-macrophage lineages.
mesh_terms: D001402:B-Lymphocytes / Q000187:drug effects*; D002448:Cell Adhesion / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008264:Macrophages / Q000187:drug effects*; D009283:Naphthol AS D Esterase / Q000378:metabolism; D010587:Phagocytosis / Q000187:drug effects; D010704:Phorbols / Q000494:pharmacology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D003115:Colony-Stimulating Factors; D010704:Phorbols; D009283:Naphthol AS D Esterase; D013755:Tetradecanoylphorbol Acetate