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The present study was undertaken to examine the effects of IL-4 on induction of cytotoxic killer activity and on production of antitumor mediators by human monocytes and alveolar macrophages (AM). The spontaneous tumoricidal activity of AM was slightly suppressed by IL-4. Addition of IL-4 to cultures of AM or monocytes with endotoxin resulted in dose-dependent suppression of their cytotoxic activity against A375 and its variant cells resistant to IL-1 and TNF-alpha. IL-4 inhibited the production of IL-1 and TNF-alpha by AM at the protein and mRNA levels. Oxygen radical production was also suppressed by treating AM with IL-4. IL-1 receptor antagonist (IL-1ra) was also produced by monocytes stimulated with LPS, but not with IL-4. Marked up-regulation by IL-4 of IL-1ra production in LPS-stimulated monocytes was observed at both the mRNA and protein levels. These findings suggest that IL-4 may be important in down-regulation of antitumor activation of human monocyte-macrophages, not only directly through inhibition of production of antitumor effector molecules, but also indirectly through up-regulation of production of IL-1ra.
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