Generalised resistance to thymic deletion in the NOD mouse: a polygenic trait characterized by defective induction of Bim
Liston, Adrian, Lesage, Sylvie, Gray, Daniel H. D., O’Reilly, Lorraine A., Strasser, Andreas, Fahrar, Aude M., Boyd, Richard L., Wilson, Judith, Baxter, Alan G., Gallo, Elena M., Crabtree, Gerald R., Peng, Kaiman, Wilson, Susan R., and Goodnow, Christopher C. (2004) Generalised resistance to thymic deletion in the NOD mouse: a polygenic trait characterized by defective induction of Bim. Immunity, 21 (6). pp. 817-830.
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The cause of common polygenic autoimmune diseases is not understood because of genetic and cellular complexity. Here, we pinpoint the action of a subset of autoimmune susceptibility loci in the NOD mouse strain linked to D1mit181, D2mit490, D7mit101, and D15mit229, which cause a generalized resistance to thymic deletion in vivo that applies equally to Aire-induced organ-specific gene products in the thymic medulla and to systemic antigens expressed at high levels throughout the thymus and affects CD4+, CD4+8+, and CD4+25+ thymocytes. Resistance to thymic deletion does not reflect a general deficit in TCR signaling to calcineurin- or ERK-induced genes, imbalance in constitutive regulators of apoptosis, nor excessive signaling to prosurvival genes but is distinguished by failure to induce the proapoptotic gene and protein, Bim, during in vivo encounter with high-avidity autoantigen. These findings establish defects in thymic deletion and Bim induction as a key mechanism in the pathogenesis of autoimmunity.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||autoimmune; NOD mouse|
|Date Deposited:||19 Feb 2010 05:48|
|FoR Codes:||11 MEDICAL AND HEALTH SCIENCES > 1107 Immunology > 110703 Autoimmunity @ 100%|
|SEO Codes:||92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920108 Immune System and Allergy @ 100%|