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The Journal of Immunology, Vol 141, Issue 5 1516-1521, Copyright © 1988 by American Association of Immunologists

ARTICLES

Synergistic activation of human monocytes by granulocyte-macrophage colony-stimulating factor and IFN-gamma. Increased TNF-alpha but not IL- 1 activity

PH Hart, GA Whitty, DS Piccoli and JA Hamilton
Department of Medicine, University of Melbourne, Parkville, Australia.

TNF-alpha and IL-1 activities and PGE2 levels were investigated in the supernatants of highly purified human monocytes cultured for 18 h with recombinant human granulocyte-macrophage CSF (GM-CSF). GM-CSF alone did not stimulate IL-1 or TNF-alpha activities or the production of PGE2. GM-CSF with IFN-gamma, but not with LPS, consistently activated the monocytes for TNF-alpha activity. In contrast, for increased IL-1 activity, GM-CSF synergized weakly and irregularly with LPS, but not at all with IFN-gamma. For the third monocyte product investigated, GM-CSF was a weak and inconsistent inducer of PGE2 and only in the co-presence of IFN-gamma. Thus, GM-CSF can elicit different responses in human monocytes depending both on the co-stimulus as well as the monocyte product being investigated.


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