Abstract
Major histocompatibility complex (MHC) class II genes are important in the pathogenesis of insulin-dependent diabetes mellitus (IDDM) both in the mouse and in man. The non-obese diabetic (NOD) mouse, which is a good model for human IDDM, has a particular MHC class II with an A complex consisting of A alpha d and the unique A beta g7 chain, as well as an absent E molecule due to a deletion in the Ea promoter region. Transgenic insertion of a functional Ea gene protects against insulitis and diabetes, but when the transgene expression is restricted to certain compartments of the immune system by deleting parts of the promoter region, the protection against insulitis is disrupted. We have analysed three promoter-mutated lines where one lacks expression on B cells and has a reduced expression on approximately 1/3 of the dendritic cells and macrophages (Sma), one lacks thymic cortical expression and has a slightly reduced B-cell expression (delta X), and one lacks expression in the thymic medulla, on macrophages, dendritic cells and about half of the B cells (delta Y). None of these lines is protected against insulitis, but Sma and delta X display a reduced intensity of insulitis, with an average of 10-15% of the islets infiltrated ...Continue Reading
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