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The Journal of Immunology, Vol 157, Issue 4 1422-1431, Copyright © 1996 by American Association of Immunologists
ARTICLES |
K Kuroda, J Yagi, K Imanishi, XJ Yan, XY Li, W Fujimaki, H Kato, T Miyoshi- Akiyama, Y Kumazawa, H Abe and T Uchiyama
Department of Microbiology and Immunology, Tokyo Women's Medical College, Japan.
In the present study we investigated the mechanism of deletion of superantigen (sAg)-reactive T cells expanded in sAg-injected mice. In staphylococcal enterotoxin A (SEA)-injected mice, IL-2 activity in serum peaked at 1 to 3 h and the expression of IL-2R alpha-chain (IL-2R alpha) on SEA-reactive (V beta 3+, or V beta 11+) T cells peaked at 6 to 12 h after the injection. Expansion of V beta 3+ or V beta 11+ T cells peaked at 2 days after the injection when most of these T cells were IL-2R alpha negative, and IL-2 activity was not detected at all in serum, suggesting the involvement of IL-2 deprivation in the deletion of expanded T cells. Implantation of an osmotic pump containing human rIL-2 (IL-2 pump) prolonged the expanded states of V beta 3+ or V beta 11+ T cells in SEA-injected C57BL/6 mice and of V beta 8+ T cells in SEB-injected MRL +/+ and Fas Ag-defective MRL-Ipr/Ipr mice. Adult thymectomy did not change at all the effect induced by implantation of IL-2 pump. DNA fragmentation was blocked substantially in mice co- treated with SEA and IL-2 pump. In addition, CD4+ T cell blasts, obtained by in vitro stimulation with rIL-2 of splenic CD4+ T cells from mice co-treated with SEA and IL-2 pump, produced substantial amounts of IL-2 upon restimulation with SEA. These results indicate that deprivation of IL-2 is deeply involved in the deletion of expanded sAg-reactive T cells and their anergy induction in sAg-injected mice.
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