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Pickering, M.C. et al.

Pickering, Warren, Rose, Carlucci, Wang, Walport, Cook, Botto,

Prevention of C5 activation ameliorates spontaneous and experimental glomerulonephritis in factor H-deficient mice.

Membranoproliferative glomerulonephritis (MPGN) type II (dense deposit disease) is an inflammatory renal disease characterized by electron-dense deposits and complement C3 on the glomerular basement membrane. There is no effective therapy. We investigated the role of C5 activation in a model of MPGN that develops spontaneously in complement factor H-deficient mice ( Cfh(-/-)). At 12 months there was a significant reduction in mortality, glomerular cellularity, neutrophil numbers, and serum creatinine levels in Cfh(-/-) mice deficient in C5. Excessive glomerular neutrophil numbers, frequently seen in patients with MPGN during disease flares, were also observed in Cfh(-/-) mice after the administration of an antiglomerular basement membrane antibody. This exaggerated injurious phenotype was absent in Cfh(-/-) mice deficient in C5 but not in Cfh(-/-) mice deficient in C6, indicating a key role for C5 activation in the induction of renal lesions. Importantly, the renal injury was completely reversed in Cfh(-/-) mice pretreated with an anti-murine C5 antibody. These results demonstrate an important role for C5 in both spontaneous MPGN and experimentally induced nephritis in factor H-deficient mice and provide preliminary evidence that C5 inhibition therapy might be useful in human MPGN type II.[1]

References

Prevention of C5 activation ameliorates spontaneous and experimental glomerulonephritis in factor H-deficient mice. Pickering, M.C., Warren, J., Rose, K.L., Carlucci, F., Wang, Y., Walport, M.J., Cook, H.T., Botto, M. Proc. Natl. Acad. Sci. U.S.A. (2006) [Pubmed]

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