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J. Exp. Med.,
Volume 186, Number 12, December 15, 1997 2057-2062
By


From the * Immunology Division, The Walter and Eliza Hall Institute of Medical Research, Victoria
3050; and Self-antigens expressed in extrathymic tissues such as the pancreas can be transported to draining
lymph nodes and presented in a class I-restricted manner by bone marrow-derived antigen-presenting cells. Such cross-presentation of self-antigens leads to CD8+ T cell tolerance induction via deletion. In this report, we investigate the influence of CD4+ T cell help on this process. Small numbers of autoreactive OVA-specific CD8+ T cells were unable to cause diabetes
when adoptively transferred into mice expressing ovalbumin in the pancreatic
The Department of Pathology and Immunology, Monash Medical School, Prahran 3181, Victoria, Australia
cells. Coinjection of OVA-specific CD4+ helper T cells, however, led to diabetes in a large proportion of
mice (68%), suggesting that provision of help favored induction of autoimmunity. Analysis of
the fate of CD8+ T cells indicated that CD4+ T cell help impaired their deletion. These data
indicate that control of such help is critical for the maintenance of CD8+ T cell tolerance induced by cross-presentation.
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