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Dirk Homann, George S. Eisenbarth
J Clin Invest. 2006;
116(5):1212
doi:10.1172/JCI28506
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utoimmune diseases such as the diabetes that develops in NOD mice depend on immunologic recognition of specific autoantigens, but recognition can result in a pathogenic or protective T cell response. A study by Du et al. in this issue of the JCI demonstrates that TGF-β signaling by T cells recognizing the insulin peptide B:9–23 is essential for such protection and that this inhibitory cytokine functions in both a paracrine and an autocrine manner (see the related article beginning on page 1360). We propose that the insulin peptide B:9–23 and a conserved TCR motif form an “immunologic homunculus” underlying the relatively common targeting of insulin by T cells that, as demonstrated by the study of Du and coworkers, results in a protective T cell response, or diabetes, as shown by other investigators, for related T cell receptors.
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