Purified protein from Salmonella typhimurium inhibits the interleukin-2 response of murine splenic T-lymphocytes activated with anti-CD3 antibody.
Previously, we demonstrated that the immunosuppression induced by a purified preparation of Salmonella typhimurium-derived inhibitor of T-cell proliferation (STI) can be observed in terms of suppression of the proliferation of murine spleen cells stimulated with a mitogenic lectin. In the present study, I observed that STI inhibited the interleukin-2 (IL-2) response of purified murine splenic T lymphocytes stimulated with anti-CD3 antibody. The flow cytometric analysis of IL-2 receptor (IL-2R) expression on T cells showed that STI specifically suppressed the expression of IL-2R beta and IL-2R gamma. Furthermore, when the IL-2-dependent T-cell line CTLL-2 was incubated with STI, the growth of CTLL-2 cells was significantly inhibited. These results suggest that the target cells for STI are T cells themselves, and that the suppression of T-cell proliferation induced by STI might involve a defect in the IL-2 receptor (IL-2R) function of T cells.
Matsui
K
K
Department of Microbiology, Meiji College of Pharmacy, Tokyo, Japan.
D000818:Animals; D001426:Bacterial Proteins / Q000494:pharmacology*; D017252:CD3 Complex / Q000276:immunology*; D002478:Cells, Cultured; D005434:Flow Cytometry; D007165:Immunosuppression Therapy; D007376:Interleukin-2 / Q000096:biosynthesis*; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D015375:Receptors, Interleukin-2 / Q000032:analysis; D012486:Salmonella typhimurium / Q000737:chemistry*; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology*
D001426:Bacterial Proteins; D017252:CD3 Complex; D007376:Interleukin-2; D015375:Receptors, Interleukin-2