The suppression of murine lupus by a tolerogenic peptide involves foxp3-expressing CD8 cells that are required for the optimal induction and function of foxp3-expressing CD4 cells

The Journal of Immunology : Official Journal of the American Association of Immunologists
Amir Sharabi, E Mozes

Abstract

A peptide, designated human CDR1 (hCDR1), that is based on the CDR1 of an anti-DNA Ab ameliorates systemic lupus erythematosus (SLE) in murine models via the induction of CD4(+)CD25(+) regulatory T cells (Tregs). In the present study, the involvement of CD8 Tregs in the mode of action of hCDR1 was investigated in SLE-afflicted (NZB x NZW)F1 mice and in SJL mice following immunization with the lupus-inducing anti-DNA mAb that bears a common Id, 16/6Id. Treatment with hCDR1 up-regulated Foxp3-expressing CD8(+)CD28(-) Tregs in association with clinical amelioration of lupus manifestations. Furthermore, the in vivo depletion of the latter cells diminished the clinical improvement and the inhibitory effects of hCDR1 on the secretion of IFN-gamma and resulted in the up-regulation of IL-10. However, the stimulatory effect of hCDR1 on the secretion of TGF-beta was not affected by the CD8 Tregs. In the absence of CD8 Tregs, CD4(+)CD25(+) Tregs were unable to expand in the hCDR1-treated mice, and the expression of Foxp3 was reduced, thereby interfering further with the suppressive function of CD4(+)CD25(+) Tregs as determined in the in vitro assays. However, CD8 cells from hCDR1-treated mice that were adoptively transferred into SLE-affl...Continue Reading

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Citations

May 21, 2010·The Journal of Immunology : Official Journal of the American Association of Immunologists·Yi-Giien TsaiChing-Yuang Lin
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