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American Journal of Pathology, Vol 143, 1356-1365, Copyright © 1993 by American Society for Investigative Pathology

REGULAR ARTICLES

Extensive complement activation in hereditary porcine membranoproliferative glomerulonephritis type II (porcine dense deposit disease)

JH Jansen, K Hogasen and TE Mollnes
Department of Morphology, Norwegian College of Veterinary Medicine, Oslo.

Massive glomerular deposits of C3 and the terminal C5b-9 complement complex (TCC), but no immune complex deposits were detected by immunofluorescence in porcine membranoproliferative glomerulonephritis type II. TCC deposits were always observed with concomitant deposits of vitronectin (S-protein) in membranoproliferative glomerulonephritis, in contrast to a piglet with mesangial glomerulopathy where TCC was present without vitronectin co-deposition. Enzyme immunoassays revealed extensive systemic complement activation in 1-week-old affected piglets, observed by low plasma C3 (about 5% of normal) and high plasma TCC (about 10 x normal). Affected piglets revealed some plasma complement activation already at birth, 3 to 4 weeks before recognizable clinical disease. It is concluded that porcine membranoproliferative glomerulonephritis represents a nonimmune complex- mediated glomerulonephritis caused by unrestricted systemic complement activation with C3 consumption, TCC formation, and glomerular trapping of complement activation products. A pathogenetic mechanism of a defective or missing complement regulation protein is suggested.

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