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To determine the effect of activation of the reticuloendothelial system on the localization of immune complexes in the kidney, a model of passive serum sickness nephritis in the mouse was used, with activation of the reticuloendothelial system with Corynebacterium parvum. Groups of mice, control and C. parvum-treated animals, were injected with BSA-125I-anti-BSA complexes containing 3 mg 125I-anti-BSA. Blood was obtained at 5 min, at 3 h, and at 12 h, when the animals were killed. Blood concentrations of BSA-125I-anti-BSA complexes were reduced in C. parvum-treated animals compared with controls. This appeared to be mediated by two effects, increased uptake of complexes in the liver and spleen, and enhanced degradation of immune complexes as measured by TCA-soluble radioactivity. In vitro studies using cultures of peritoneal macrophages also showed enhanced uptake of immune complexes. The amount of immune complexes deposited in the glomeruli of C. parvum-treated animals was reduced as determined by quantitation of radiolabeled material bound to isolated gomeruli and by immunofluorescence techniques. The results of the study emphasize the role of the reticuloendothelial system in the modulation of immune complex localization in the kidney and suggest a potential use of stimulants of the reticuloendothelial system in the therapy of immune complex nephritis.

Modification of glomerular immune complex deposition in mice by activation of the reticuloendothelial system.