Abstract
Interferon-gamma (IFN-gamma) enhanced the cytotoxic capability of freshly isolated human blood monocytes but failed to enhance the tumoricidal competence of monocyte-derived macrophages. Treatment of monocytes with IFN-gamma (100 U/ml) caused a significant increase (P < 0.001) in lucigenin-dependent chemiluminescence and O2- production stimulated by N-formyl-L-methionyl-L-leucyl-L-phenylalanine (FMLP) during the first few days in culture but IFN-gamma was unable to prevent the decline to negligible levels of chemiluminescence and O2- production which occurred during the later days in vitro. Culture of monocytes in the presence of IFN-gamma had no effect on phorbol 12-myristate 13-acetate (PMA)-stimulated O2- production. However, IFN-gamma decreased PMA-stimulated lucigenin-dependent chemiluminescence during the first 24 hr in vitro but then significantly enhanced (P < 0.001) chemiluminescence after 2-4 days in culture. IFN-gamma was unable to prevent the eventual decline to undetectable levels in PMA-stimulated chemiluminescence during the later days in vitro. Nitrite production by macrophages was unaffected by IFN-gamma treatment. It is concluded therefore, that IFN-gamma enhanced the cytotoxicity of freshly isolated human blood monocytes by increasing reactive oxygen intermediate generation but was unable to enhance the tumoricidal competence of macrophages as reactive nitrogen intermediate production was unaffected.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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