Abstract
Although lupus is commonly thought of as a B-cell disease, evidence from murine models of lupus-like syndromes and our understanding of how T cells coordinate the overall immune response suggest that T cells play a fundamental role in this disorder. Our group has developed a model that directly implicates T cells in the initiation of drug-induced and idiopathic lupus, and suggests molecular mechanisms relevant to this process. These studies derive from experiments aimed at determining the importance of DNA methylation in the regulation of T-cell function and gene expression. One particularly interesting outcome of these experiments is that hypomethylated CD4+ cells are no longer dependent on antigen for activation, and respond to antigen-presenting cells (APCs) lacking specific antigen, thus demonstrating characteristics of autoreactivity. We have used this observation to develop a working model for the study of both idiopathic and drug-induced lupus, in which methylation changes in the promoter sequences of critical genes lead to autoreactivity, and the autoreactive T cells then induce an autoimmune disease. This chapter reviews the current concepts regarding DNA methylation and its role in gene regulation, and relates this information to our model of T-cell—induced lupus-like disease. Finally, this chapter describes our current work for consideration as an area of research to be pursued to understand fully the molecular events initiating lupus.
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Scott, J.M., Richardson, B.C. (1999). Impaired DNA Methylation in Lupus T Cells. In: Kammer, G.M., Tsokos, G.C. (eds) Lupus. Contemporary Immunology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-703-1_17
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