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Antigen receptor-stimulated cell death of developing, immature T cells plays an important role in shaping the repertoire of antigens to which mature T cells will respond, but a role for receptor-stimulated death in controlling responses of mature T cells is controversial. Mutant lpr/lpr mice exhibit an autoimmune syndrome similar to systemic lupus erythematosus. Here we demonstrate that these mice have a defect in antigen-stimulated suicide of activated T cells in mature CD4+ and CD8+ T cell compartments. The defective suicide pathway is evident when the T cells are stimulated with antigen on antigen-presenting cells or with immobilized anti-CD3 in the absence of antigen-presenting cells. These studies, in concert with the work of others, suggest that antigen-stimulated death of mature cells may be important both in establishing peripheral tolerance and in limiting inflammation during normal immune responses.

Mature T cells of autoimmune lpr/lpr mice have a defect in antigen-stimulated suicide.