The Journal of Immunology, Vol 154, Issue 12 6238-6245, Copyright © 1995 by American Association of Immunologists

ARTICLES

CD4+ T cells anergized by high dose feeding establish oral tolerance to antibody responses when transferred in SCID and nude mice

K Hirahara, T Hisatsune, K Nishijima, H Kato, O Shiho and S Kaminogawa
Department of Applied Biological Chemistry, University of Tokyo, Japan.

The cellular mechanism for oral tolerance in specific Ab response was investigated by cell-transfer experiments, using severe combined immunodeficiency (SCID) and BALB/c nu/nu mice. High dose feeding with bovine alpha s1-casein, a major allergen in milk, to BALB/c mice induced Ag-specific oral tolerance to the specific Ab response. This state of oral tolerance was successfully transferred to SCID mice with splenocytes from orally tolerant BALB/c mice. In SCID mice that were transferred with tolerant T cells and normal B cells before being immunized with alpha s1-casein, oral tolerance to the Ab responses was generated. In addition, only the T cells established the tolerant state in nude mice. A decreased proliferative response of the splenic T cells from BALB/c mice against alpha s1-casein was also shown, indicating that the decreased Ab responses were attributed to the unresponsiveness of the splenic T cells. Next, the tolerant splenic T cells were further separated into CD4+ T cells and CD8+ T cells, remixed with normal cells, and then transferred to nude mice, which revealed that the tolerant state in the nude mice was principally generated by the CD4+ T cells. When tolerant CD4+ T cells were cotransferred with normal CD4+ T cells to nude mice, there was no significant reduction in the specific Ab responses. These results demonstrate that splenic CD4+ T cells anergized by high dose feeding established oral tolerance to the Ab responses when transferred to SCID and nude mice.

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