Bacterial lipopolysaccharide-induced interferon-gamma production: roles of interleukin 1 and interleukin 2 - PubMed (original) (raw)
. 1986 Jun 15;136(12):4525-30.
- PMID: 3086435
Bacterial lipopolysaccharide-induced interferon-gamma production: roles of interleukin 1 and interleukin 2
J Le et al. J Immunol. 1986.
Abstract
Bacterial lipopolysaccharide (LPS) induced human peripheral blood mononuclear cells (PBMC) to produce interferon-gamma (IFN-gamma). Monocytes play a mandatory accessory role in this process, because purified T lymphocytes failed to produce IFN-gamma in response to LPS and the addition of 2% monocytes to T cell cultures resulted in an optimal LPS-induced IFN-gamma production. IFN-gamma production was abolished in the presence of monoclonal antibodies specific for HLA-DR antigen. Addition of exogenous interleukin 2 (IL 2) markedly enhanced IFN-gamma secretion by PBMC induced with LPS. The addition of anti-Tac antibody specific for IL 2 receptors abrogated IFN-gamma production, suggesting that an interaction of IL 2 with IL 2 receptors was involved. By using a specific antibody binding assay, LPS was shown to amplify IL 2 receptor expression on PBMC, whereas exogenous IL 2 showed only a negligible enhancing effect on the expression of its own receptors. Interleukin 1 (IL 1), a product of LPS-stimulated monocytes, potentiated IL 2-induced IFN-gamma production in the absence of LPS. Neither IL 1 nor IL 2 alone induced IFN-gamma production in purified T lymphocyte cultures. When added together, however, substantial levels of IFN-gamma were induced. An enhanced IL 2 receptor expression on T cells was also demonstrated as a result of the combined action of IL 1 and IL 2. These results suggest that induction of IFN-gamma by LPS is due mainly to the generation of IL 1 and an enhanced expression of IL 2 receptors.
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