Abstract
Irreversible mesangial changes with persistent proteinuria were induced in rats given two consecutive injections 2 weeks apart of a MoAb 1-22-3 to rat mesangial cell. The characteristics of the resulting lesions were investigated and compared with those of the reversible change induced by a single injection. At 24 h after the second injection, mesangiolytic changes similar to those after a single injection were evident. The accumulation of macrophage-like cells in glomeruli observed at 1 week after the first injection was not evident during the experimental period after the second injection. Hypercellularity with the characteristics of intrinsic mesangial cell and increased mesangial matrix were already present 1 week after the second injection. And mesangial sclerotic change progressed up to 6 months. Deposition of collagen type I and type III and accumulation of collagen fibril at the ultrastructural level were evident in rats 6 months after the second injection. Proteinuria started immediately and continued for more than 6 months after the second injection. The mesangial sclerotic change with persistent proteinuria described here is considered to be a better model for investigating the mechanism of chronic progression of human mesangial proliferative glomerulonephritis.
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