Salmonella infection-induced non-responsiveness of murine splenic T-lymphocytes to interleukin-2 (IL-2) involves inhibition of IL-2 receptor gamma chain expression.
In a previous study we demonstrated that Salmonella typhimurium-induced immunosuppression involved T-cell non-responsiveness to interleukin-2 (IL-2). In this study we observed that Salmonella-induced T-cell non-responsiveness to IL-2 was not reversed completely by treatment with N(G)-monomethyl-L-arginine, which is known to inhibit nitric oxide (NO) secretion by macrophages in culture. Furthermore, when purified splenic T-lymphocytes from Salmonella-infected mice were activated with an anti-CD3 antibody, the responsiveness of these T-cells to IL-2 was suppressed significantly. Results of flow cytometric analysis using an anti-IL-2 receptor gamma chain (IL-2Rgamma) antibody showed that IL-2Rgamma expression in mitogen-activated T-cells was down-regulated by Salmonella infection. These results suggest that Salmonella infection-induced T-cell non-responsiveness to IL-2 involves a defective function of T-cells themselves and appears to be regulated by inhibition of IL-2Rgamma expression in T-cells.
Matsui
K
K
Department of Microbiology, Meiji College of Pharmacy, Tokyo, Japan.
Arai
T
T
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D017252:CD3 Complex / Q000276:immunology; D005434:Flow Cytometry; D007165:Immunosuppression Therapy; D007376:Interleukin-2 / Q000276:immunology*; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D015375:Receptors, Interleukin-2 / Q000096:biosynthesis*; D012481:Salmonella Infections, Animal / Q000276:immunology*; D012486:Salmonella typhimurium / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D019323:omega-N-Methylarginine / Q000494:pharmacology
D000911:Antibodies, Monoclonal; D017252:CD3 Complex; D007376:Interleukin-2; D015375:Receptors, Interleukin-2; D019323:omega-N-Methylarginine