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The Journal of Immunology, Vol 146, Issue 11 3779-3784, Copyright © 1991 by American Association of Immunologists

ARTICLES

A novel differentiation antigen on human monocytes that is specifically induced by granulocyte-macrophage colony-stimulating factor or IL-3

K Maeda, S Sone, Y Ohmoto and T Ogura
Third Department of Internal Medicine, University of Tokushima School of Medicine, Japan.

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.


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