title: A novel differentiation antigen on human monocytes that is specifically induced by granulocyte-macrophage colony-stimulating factor or IL-3.
abstract: A mouse mAb (TOMS-1) was generated against human blood monocytes that had been cultured for 4 days in medium with recombinant human granulocyte-macrophage CSF (GM-CSF). TOMS-1 (IgG1) detected a unique cell surface Ag with a molecular mass of about 43 kDa under both reducing and nonreducing conditions. TOMS-1Ag was expressed on monocytes treated with GM-CSF, but not on fresh or untreated monocytes. This Ag was induced dose dependently during culture of monocytes with GM-CSF for more than 24 h, reaching a maximum level in 3 or 4 days. Treatment of monocytes with cycloheximide in the presence of GM-CSF blocked TOMS-1Ag induction completely, indicating that de novo protein synthesis was required for its expression. TOMS-1Ag was also induced by treatment of monocytes with IL-3, but not with other cytokines such as macrophage-CSF, IL-4, and IFN-gamma or stimulators including LPS, desmethyl muramyl dipeptide, and PMA. TOMS-1Ag expression induced by GM-CSF was up-regulated by IL-4, but down-regulated by IFN-gamma. TOMS-1Ag was not induced on lymphocytes, granulocytes, or AM by GM-CSF or appropriate stimuli. TOMS-1Ag was also not expressed on any cell lines of human leukemias or solid tumors examined. Thus, TOMS-1Ag is a monocyte-specific differentiation Ag induced by GM-CSF or IL-3. These results suggest that TOMS-1 should be useful for monitoring the process of monocyte differentiation by GM-CSF or IL-3.
authors.affiliation: Third Department of Internal Medicine, University of Tokushima School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Maeda
authors.forename: S
authors.initials: S
authors.lastname: Sone
authors.forename: Y
authors.initials: Y
authors.lastname: Ohmoto
authors.forename: T
authors.initials: T
authors.lastname: Ogura
mesh_terms: D000943:Antigens, Differentiation / Q000032:analysis*; D002460:Cell Line; D003513:Cycloheximide / Q000494:pharmacology; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D007377:Interleukin-3 / Q000494:pharmacology*; D015847:Interleukin-4 / Q000494:pharmacology; D009000:Monocytes / Q000187:drug effects / Q000276:immunology*
chemical_list: D000943:Antigens, Differentiation; D007377:Interleukin-3; D015847:Interleukin-4; D007371:Interferon-gamma; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D003513:Cycloheximide