Interleukin‐10 Inhibits Antimicrobial Activity Against Leishmania major in Murine Macrophages
- 1 October 1994
- journal article
- Published by Wiley in Scandinavian Journal of Immunology
- Vol. 40 (4), 403-409
- https://doi.org/10.1111/j.1365-3083.1994.tb03481.x
Abstract
The stimulation of macrophages is of importance to the defense against intracellularly replicating microorganisms such as Leishmania. In this study the direct effect of recombinant interleukin-10 (IL-10) on the leishmanicidal effector functions of murine peritoneal or bone marrow derived macrophages was investigated. IL-10 almost completely inhibited the killing of intracellular leishmania at concentrations above 10 ng/ml. This inhibitory effect was independent of the stimulus used as the activation of macrophages by IFN-gamma and IL-7, recently shown to possess macrophage activating properties, were suppressed by IL-10. Kinetic experiments revealed that IL-10 must be present during the process of macrophage activation and that the leishmanicidal effector function of fully activated macrophages was not influenced. Furthermore, in the absence of exogenously added IL-10, the addition of neutralizing antibodies against IL-10 or IL-10-specific antisense phosphorothioate DNA-oligonucleotide led to an enhanced killing of parasites after stimulation with either IFN-gamma or IL-7. In accordance with this, IL-10 mRNA was readily detectable in murine macrophages by PCR with reverse transcribed mRNA. These results indicate that IL-10, which is endogenously produced by macrophages, acts as an autocrine deactivating factor supporting the survival of the parasite.Keywords
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