Binding of factor H to tubular epithelial cells limits interstitial complement activation in ischemic injury.

Kidney International
Brandon RennerJoshua M Thurman

Abstract

Factor H is a regulator of the alternative pathway of complement, and genetic studies have shown that patients with mutations in factor H are at increased risk for several types of renal disease. Pathogenic activation of the alternative pathway in acquired diseases, such as ischemic acute kidney injury, suggests that native factor H has a limited capacity to control the alternative pathway in the kidney. Here we found that an absolute deficiency of factor H produced by gene deletion prevented complement activation on tubulointerstitial cells after ischemia/reperfusion (I/R) injury, likely because alternative pathway proteins were consumed in the fluid phase. In contrast, when fluid-phase regulation by factor H was maintained while the interaction of factor H with cell surfaces was blocked by a recombinant inhibitor protein, complement activation after renal I/R increased. Finally, a recombinant form of factor H, specifically targeted to sites of C3 deposition, reduced complement activation in the tubulointerstitium after ischemic injury. Thus, although factor H does not fully prevent activation of the alternative pathway of complement on ischemic tubules, its interaction with the tubule epithelial cell surface is critical for l...Continue Reading

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