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Participation of the interstitium in acute immune‐complex nephritis: interstitial antigen accumulation, cellular infiltrate, and MHC class II expression

Bovine serum albumin (BSA) injected into the rabbits induces acute immune complex glomerulonephritis. Since albumin is filtered and reabsorbed in the tubules, we investigated whether tubulointerstitial cells participate in the pathogenesis of this experimental condition. For this purpose, we induced immune‐complex nephritis in 45 rabbits with the injection of 125I‐BSA and urinary BSA excretion, glomerular and tubulointerstitial BSA accumulation, lymphocyte infiltration, proliferative activity and MHC class II antigens were examined 2, 4–5 and 6–8 days after immunization.