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Hypothesis: A recurrent, moderate activation fosters systemic autoimmunity — the apoptotic roles of TCR, IL-2 and fas ligand

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Journal of Biomedical Science

Abstract

Studies of several gene knockout mice suggest an interesting association of a moderate T cell response with systemic autoimmune diseases. In addition, CD95 ligand (FasL) expression in some strains of these mice is impaired. Because FasL is critically involved in regulating peripheral tolerance, there may be a link between autoimmune diseases and a moderate T cell response that cannot activate the FasL gene. Here, we propose that there are two thresholds of T cell activation. When moderately stimulated, T cells can be activated to the low (1st) threshold, which permits the induction of CD40L, IL-2, IL-4, and other components that help the immune response. The high (2nd) activation threshold can only be achieved by a strong and concurrent stimulation through TCR and IL-2R. Once the high threshold is reached, FasL is produced to induce apoptosis of the activated T and B cells. In the absence of the FasL-mediated downregulation, the activated B cells become efficient antigen-presenting cells for self-antigens and excellent responders for T cell help. Such an exacerbating condition, induced by recurrent and moderate activation, favors the development of autoreactive T cells and autoantibody production. Evidence supporting this hypothesis and some predictions that can be tested are described.

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  1. The Arthritis Center, Boston University School of Medicine, K508, 71 E. Concord Street, 02118, Boston, MA, USA

    Ken Matsui, Satoshi Jodo, Sheng Xiao & Shyr-Te Ju PhD

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  1. Ken Matsui
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Matsui, K., Jodo, S., Xiao, S. et al. Hypothesis: A recurrent, moderate activation fosters systemic autoimmunity — the apoptotic roles of TCR, IL-2 and fas ligand. J Biomed Sci 6, 306–313 (1999). https://doi.org/10.1007/BF02253519

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