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The Journal of Immunology, 2000, 164: 2890-2896.
Copyright © 2000 by The American Association of Immunologists

A Bone Marrow-Derived APC in the Gut-Associated Lymphoid Tissue Captures Oral Antigens and Presents Them to Both CD4+ and CD8+ T Cells1

Effrossini Blanas*, Gayle M. Davey*, Francis R. Carbone{dagger} and William R. Heath2,*

* Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia; and {dagger} Department of Pathology and Immunology, Monash Medical School, Prahran, Victoria, Australia

We have previously reported that feeding OVA to C57BL/6 mice can lead to a weak CTL response that is dependent on CD4+ T cell help and is capable of causing autoimmunity. In this study, we investigated the basis of the class I and class II-restricted Ag presentation required for such CTL induction. Two days after feeding OVA, Ag-specific CD4+ and CD8+ T cells were seen to proliferate in the Peyer’s patches and mesenteric lymph nodes. Little proliferation was evident in other lymphoid tissues, except at high Ags doses, in which case some dividing CD4+ T cells were observed in the spleen and peripheral lymph nodes. Using chimeric mice, the APC responsible for presenting orally derived Ags was shown to be derived from the bone marrow. Examination of the Ag dose required to activate either CD4+ or CD8+ T cells indicated that a single dose of 6 mg OVA was the minimum dose that consistently stimulated either T cell subset. These data indicate that oral Ags can be transported from the gut into the gut-associated lymphoid tissue, where they are captured by a bone marrow-derived APC and presented to both CD4+ and CD8+ T cells.




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