Regulation of murine macrophage function by IL-4: IL-4 and IFN-gamma differentially regulate macrophage tumoricidal activation.
To understand the differential role of interferon-gamma (IFN-gamma) and interleukin-4 (IL-4) in the process of macrophage tumoricidal activation, we investigated the production of tumor necrosis factor-alpha (TNF-alpha) and nitric oxide in activated murine macrophages and the effects of those lymphokines on prostaglandin E2 (PGE2)-mediated down-regulation. IFN-gamma and IL-4 increased lipopolysaccharide (LPS)-induced TNF-alpha production by different mechanisms because IL-4, unlike IFN-gamma, failed to overcome the LPS-hyporesponsiveness in C3H/HeJ mice. Moreover, only IFN-gamma synergized with LPS to induce nitric oxide production and blocked eicosanoid-mediated down-regulation. These differential effects of IFN-gamma and IL-4 on the select efferent cytolytic activities may be the result of an altered or different signal transduction pathway. Because potentiation of protein kinase C (PKC) activity by IFN-gamma has been previously documented, we next studied the role of IFN-gamma and IL-4 in alteration of enzymatic activity of PKC. Two lymphokines caused translocation of PKC from cytosol to membrane with different levels, providing a biochemical basis for explaining how two lymphokines lead to different phenotypic responses. Although treatment of macrophages with IFN-gamma and IL-4 gave rise to a similar enhancing effect on macrophage TNF-alpha production, these two lymphokines appeared to differentially regulate the overall functional state of macrophages for tumour cell killing capability. Additionally, this differential regulation seems to be accomplished in part by different biochemical events.
Suk
K
K
Department of Cell Biology and Human Anatomy, School of Medicine, University of California, Davis 95616-8643.
Somers
S D
SD
Erickson
K L
KL
D000818:Animals; D003602:Cytotoxicity, Immunologic; D005260:Female; D007371:Interferon-gamma / Q000276:immunology*; D015847:Interleukin-4 / Q000276:immunology*; D008070:Lipopolysaccharides / Q000276:immunology; D008262:Macrophage Activation / Q000276:immunology*; D051379:Mice; D008805:Mice, Inbred A; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D009374:Neoplasms, Experimental / Q000276:immunology; D009585:Nitrogen Dioxide / Q000378:metabolism; D011994:Recombinant Proteins / Q000276:immunology; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis*
D008070:Lipopolysaccharides; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4; D007371:Interferon-gamma; D009585:Nitrogen Dioxide