In contrast, all aire/TCR DKO mice were healthy and their weight remained stable as far out as 40 weeks of age (data not shown), a time at which no aire-deficient or aire/IgH deficient animal survived

In contrast, all aire/TCR DKO mice were healthy and their weight remained stable as far out as 40 weeks of age (data not shown), a time at which no aire-deficient or aire/IgH deficient animal survived. in contrast to B cells which play a more limited role in autoimmunity. Th1 polarized CD4+ T cells, in particular, are major contributors to the autoimmune response. With this knowledge, we go on to utilize therapies targeted at T cells to investigate their ability to modulate diseasein vivo. Depletion of CD4+ T cells using a neutralizing antibody ameliorated the disease process. Thus, therapies targeted specifically at the CD4+ T cell subset may help control autoimmune disease in patients with APS1. Keywords:Autoimmunity, Tolerance, T cells, Thymus == Introduction == Autoimmune Polyglandular Syndrome Type 1 (APS1) is usually a monogenic autoimmune disease that is inherited in an autosomal recessive pattern (1). Individuals with this disease present with a clinical triad including adrenal insufficiency, chronic mucocutaneous infections, and hypoparathyroidism. In addition to these hallmarks of disease, patients frequently have other autoimmune manifestations including type 1 diabetes, Sjgren’s syndrome, vitiligo, keratitis, alopecia, gastritis, and other syndromes believed to be of an autoimmune etiology (2). The basis for such a strong predisposition to autoimmunity was genetically mapped by two impartial groups, resulting in the identification of the Autoimmune regulator(Aire)gene (3,4). The Aire protein, which bears strong resemblance to a transcription factor and has been shown to localize to nuclear speckles (5), is usually expressed in a subset of medullary thymic epithelial cells (mTECs) that are Rabbit Polyclonal to CA12 associated with negative selection of developing thymocytes. Within mTECs, Aire controls the promiscuous expression of many peripheral autoantigens through mechanisms that are not completely comprehended (6). The absence of Aire expression results in an inability to remove autoreactive thymocytes from your immune repertoire, ultimately resulting in autoimmune disease against multiple tissues (7). Despite the evidence suggesting the thymus as the key to the initiation of the disease process, multiple cells could play a role in the autoimmunity that eventually ensues and tissue destruction may be mediated by cell types other than T cells. In APS1 patients and aire-deficient mice, autoantibodies realizing several organ-specific autoantigens have been recognized including insulin, glutamic acid decarboxylase, cytochrome P450, 21-hydroxylase (8), and more recently tudor-domain made up of protein 6 in humans (9) as well as interphotoreceptor retinoid binding protein (7), fodrin (10), pancreas specific protein disulfide isomerase (11), and mucin-6 (12) in aire-deficient mice It NSC 3852 is unclear, however, whether or not these autoantibodies are pathogenic and what role they, or the B cells that produce them, may play in the NSC 3852 progression of disease. Aire-deficient mice remain the best tool available to study this unique process and mimic the human disease in many ways. Due in part to the difficulties in studying human patients and their relative rarity in clinical medicine, little is known about the specific contribution of different cell types in disease pathogenesis and progression. To further understand the role that the immune system plays in aire-mediated autoimmunity, we performed a detailed analysis of lymphocyte function within aire-deficient mice and bred the aire mutation onto several genetic backgrounds including mice deficient for T and B cells. Here, we present the results of these studies around the relative role of T and B cells in mediating disease and demonstrate that T cells are indispensable to the disease process, whereas B cells play a more limited role in autoimmunity. Therapies targeting CD4+ T cells ameliorated autoimmunity, supporting these genetic and adoptive transter studies and suggesting a clinically relevant avenue of therapeutic exploration. == Materials and Methods == == Mice == Aire-deficient mice were generated as previously explained (6) and were backcrossed into the C57BL/6 and NOD Lt/J backgrounds NSC 3852 greater than 10 generations. IgH-deficient (13), STAT4-deficient (14), and STAT6-deficient (15) around the NOD background and CIITA-deficient mice (16) around the C57/BL6 background were purchased from Jackson Labs and bred to mice inside our service. All mice had been housed within a pathogen-free NSC 3852 hurdle service at UCSF. Tests complied with the pet Welfare NIH and Work suggestions for the ethical treatment and make use of.