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The repeated administration of mercury to rats of the Brown Norway (BN) inbred strain results in a self-limiting production of autoantibodies to renal antigens (e.g., laminin) and autoimmune glomerulonephritis. In contrast, rats of the Lewis (LEW) strain do not develop renal autoimmunity after mercury treatment. Suppressor T-cells and/or the idiotype-anti-idiotype network have been implicated in the control of autoimmunity in susceptible (BN) rats as well as the "resistant" state of nonsusceptible (LEW) animals. In our investigations of the immune regulation of mercury-induced autoimmune glomerulonephritis, we have performed a phenotypic analysis of lymphocyte subpopulation in the spleens and lymph nodes of mercury-treated and control LEW, BN, and (BN x LEW) F1 hybrid rats. Of particular interest were RT6+ T-cells, a subpopulation of lymphocytes that may have immunoregulatory properties and show a relative decrease in mercury-treated BN rats concomitantly with the development of autoimmune responses to renal autoantigens. LEW rats did not develop renal autoimmunity after mercury treatment and had no significant change in the ratio of RT6+ to RT6- T-lymphocytes. Interestingly, the administration of mercury to (BN x LEW) F1 hybrid rats caused effects similar to those observed in the BN strain. Auto-immune responses to antigens of the kidney coincided with a change in the balance within the RT6 cell population, which was altered in favor of T-lymphocytes that do not express the RT6 phenotype.(ABSTRACT TRUNCATED AT 250 WORDS)

Mercury-induced renal autoimmunity: changes in RT6+ T-lymphocytes of susceptible and resistant rats.