Macrophage-mediated suppression. I. Evidence for participation of both hdyrogen peroxide and prostaglandins in suppression of murine lymphocyte proliferation - PubMed (original) (raw)
- PMID: 7356724
Macrophage-mediated suppression. I. Evidence for participation of both hdyrogen peroxide and prostaglandins in suppression of murine lymphocyte proliferation
Z Metzger et al. J Immunol. 1980 Feb.
Abstract
Macrophage-mediated suppression of Con A induced proliferation of murine splenic lymphocytes was studied in vitro. Either Corynebacterium parvrum-induced peritoneal exudate cells (PEC) or thioglycollate-induced PEC could totally suppress lymphocyte proliferation at a PEC:lymphocyte ratio of 2:10, whereas a ratio of 1 to 1.5: 10 caused a partial (60 to 68%) suppression. Exogenous PGE1 and PGE2 at concentrations of 10(-8) to 10(-6) M could not totally suppress lymphocyte proliferation. Conversely, indomethacin reversed the partial suppression by macrophages but only partially protected the totally suppressed lymphocyte cultures. Macrophage-mediated cytotoxicity and cytostasis have been proposed to be mediated by hydrogen peroxide. Therefore, hydrogen peroxide was investigated as a possible additional cause for macrophage-mediated suppression, by testing the anti-inhibitory effects of catalase. Partially suppressed cultures were effectively protected from suppression by catalase. In totally suppressed cultures, catalase alone was only minimally effective, but a synergistic effect of catalase and indomethacin was obtained, which provided complete protection from maximal macrophage-mediated suppression. Catalase presumably contributes to the reversal of macrophage suppressive effects both by reducing the direct toxic effect of H2O2 and by preventing the H2O2 from generating additional prostaglandins.
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