Role of interferon-gamma in counteracting the suppressive effects of transforming growth factor-beta 2 and glucocorticoids on the production of tumor necrosis factor-alpha - PubMed (original) (raw)
Role of interferon-gamma in counteracting the suppressive effects of transforming growth factor-beta 2 and glucocorticoids on the production of tumor necrosis factor-alpha
D M Dunham et al. J Leukoc Biol. 1990 Dec.
Abstract
The multipotential cytokine, transforming growth factor-beta 2 (TGF-beta 2), is as effective as glucocorticoids in suppressing the production of tumor necrosis factor-alpha (TNF-alpha) by lipopolysaccharide (LPS)-stimulated macrophages, and this inhibition can be abrogated by exogenous interferon-gamma (IFN-gamma). Porcine alveolar macrophages triggered with LPS produce TNF-alpha as identified by complete blocking of cytotoxicity on WEHI 164 clone 13 cells in macrophage supernatants by a monoclonal antibody to human TNF-alpha. Platelet-derived porcine TGF-beta 2, at a concentration of 4 nM, inhibited LPS-induced production of TNF-alpha by 93%. Dexamethasone was as effective as TGF-beta 2, suppressing TNF-alpha production by 86% at a concentration of 4 nM. The natural but less potent glucocorticoid cortisol inhibited TNF-alpha production by 100% at a 100-fold higher concentration (400 nM). Recombinant PoIFN-gamma consistently primed LPS-triggered macrophages for increased production of TNF-alpha by 50-100%, and this priming was totally blocked by a polyclonal antibody to rPoIFN-gamma. Furthermore, the suppression in LPS-induced production of TNF-alpha caused by TGF-beta 2, dexamethasone, and cortisol could be reversed by addition of rPoIFN-gamma. These data show that alveolar macrophages can be effectively primed by rPoIFN-gamma even in the presence of moderately suppressive doses of TGF-beta 2 and antiinflammatory steroids.
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