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* Departments of Medicine and Microbiology-Immunology, Division of Rheumatology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611; and
Department of Pathology, Case Western Reserve University, Cleveland, OH 44106
We induced very low-dose tolerance by injecting lupus prone (SWR x NZB)F1 (SNF1) mice with 1 µg nucleosomal histone peptide autoepitopes s.c. every 2 wk. The subnanomolar peptide therapy diminished autoantibody levels and prolonged life span by delaying nephritis, especially by reducing inflammatory cell reaction and infiltration in kidneys. H471–94 was the most effective autoepitope. Low-dose tolerance therapy induced CD8+, as well as CD4+CD25+ regulatory T (Treg) cell subsets containing autoantigen-specific cells. These adaptive Treg cells suppressed IFN-
responses of pathogenic lupus T cells to nucleosomal epitopes at up to a 1:100 ratio and reduced autoantibody production up to 90–100% by inhibiting nucleosome-stimulated T cell help to nuclear autoantigen-specific B cells. Both CD4+CD25+ and CD8+ Treg cells produced and required TGF-
1 for immunosuppression, and were effective in suppressing lupus autoimmunity upon adoptive transfer in vivo. The CD4+CD25+ T cells were partially cell contact dependent, but CD8+ T cells were contact independent. Thus, low-dose tolerance with highly conserved histone autoepitopes repairs a regulatory defect in systemic lupus erythematosus by generating long-lasting, TGF--producing Treg cells, without causing allergic/anaphylactic reactions or generalized immunosuppression.
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