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Journal of the American Society of Nephrology, Vol 6, 234-241, Copyright © 1995 by American Society of Nephrology

REGULAR ARTICLES

The role of a complement regulatory protein in rat mesangial glomerulonephritis

H Nishikage, L Baranyi, H Okada, N Okada, K Isobe, A Nomura, F Yoshida and S Matsuo
Third Department of Internal Medicine, Nagoya University School of Medicine, Japan.

The host cells are protected from the indiscriminate attack of homologous complement by the membrane-associated complement regulatory proteins. A mouse monoclonal antibody (mAb) 512 (immunoglobulin G1 subclass) has recently been described that recognizes and inhibits the function of a rat complement regulatory protein, a rat homologue of mouse Crry/p65. The aim of this work is to assess the role of a complement regulatory protein (512Ag) recognized by mAb 512 in the complement-dependent glomerular injury induced by mAb OX7 against rat Thy-1.1. For the induction of mesangial injury, the left kidney of a rat was perfused with a combination of OX7 and 512 and the perfusate was discarded from the renal vein (Group I). After the renal artery and vein were restored, the left kidney was connected to the systemic circulation. Rats were euthanized 3 h, 2 days, and 14 days later. Rats perfused either with OX7 (Group II) or with 512 (Group III) or with vehicle only (Group IV) were used as controls. At 3 h, rats of Group I showed more prominent cellular infiltration and mesangial lysis and more C3 deposition in the glomeruli than rats of Group II. Rats of Groups III and IV showed no significant changes. At Day 2, there was still significant mesangial lysis and leukocyte infiltration in Group I rats, whereas rats in other groups showed an almost normal appearance. Glomerular injury in Group I rats returned to normal by Day 14.


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