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Section of Immunobiology, Yale University School of Medicine, and Howard Hughes Medical Institute, New Haven, CT 06510
Bone marrow (BM)-derived dendritic cells (DC) are potent stimulators of naive CD4+ T cell activation. Because DC are efficient at Ag processing and could potentially present self Ags, we investigated the role of DC in the presentation of an encephalitogenic peptide from myelin basic protein (Ac111) in the induction of experimental autoimmune encephalomyelitis (EAE). To determine if DC could prime for EAE, we transferred DC pulsed with Ac111 or with medium alone into irradiated mice in combination with CD4+ T cells isolated from a mouse transgenic for a TCR specific for Ac111 + I-Au. Mice transferred with Ac111-pulsed DC developed EAE 710 days later, whereas mice receiving medium-pulsed DC did not. By day 15, all mice given peptide-loaded DC had signs of tail and hind limb paralysis, and by day 20 infiltration of Ac111-specific CD4+ T cells was detected in the brain parenchyma. We also demonstrated interactions between Ac111-pulsed DC and Ac111-specific T cells in the lymph nodes 24 h following adoptive transfer of both cell populations. These data show that DC can efficiently present the self Ag myelin basic protein Ac111 to Ag-specific T cells in the periphery of mice to induce EAE.
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