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D-penicillamine (DP) has been previously shown to induce an autoimmune disease in Brown-Norway (BN) rats, characterized by a dermatitis, by the production of antinuclear antibodies, by the formation fo circulating immune complexes, and by linear IgG deposits along the glomerular basement membrane. These manifestations are quite similar to those observed in mercuric chloride (HgCl2)-induced autoimmunity. The mechanism of the latter disease has been recently partly elucidated. The aim of this study was to compare DP and HgCl2-induced autoimmunity in BN rats and to compare the mechanisms involved in both situations. A transient increase in the number of spleen cells, affecting B cells and CD4+ T cells, and an increase in serum IgE concentration, previously reported in HgCl2-induced autoimmunity, were observed during DP treatment. Autoreactive anti-class II T cells able to proliferate not only in the presence of autologous B cells but also in the presence of syngeneic normal B cells were found in DP-treated BN rats. Spontaneous regulation occurred, associated with the disappearance of autoreactive T cells. Suppressor CD8+ T cells were not involved in this phenomenon. Mechanisms involved in both the induction and the regulation of DP-induced autoimmunity seem to be quite similar to those reported in HgCl2-induced autoimmunity.
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