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The Journal of Immunology, Vol 137, Issue 5 1636-1641, Copyright © 1986 by American Association of Immunologists
ARTICLES |
LF Fries, HM Friedman, GH Cohen, RJ Eisenberg, CH Hammer and MM Frank
Mammalian cells in culture express membrane receptors for C3b when infected with HSV-1. C3b binding is mediated by glycoprotein C (gC), a virus-specified membrane glycoprotein. In view of the inhibitory functions of other C3b-binding proteins, we studied the capacity of gC to modulate complement activation. Glycoprotein C was purified from HSV- 1-infected cells by immunoaffinity chromatography. Glycoprotein C, but not a control viral glycoprotein, demonstrated dose-dependent acceleration of decay of C3bBb sites. In addition, gC produced a dose- dependent, time-independent depression of the overall hemolytic efficiency of C3bBb sites. Inhibition of C5b6-initiated reactive lysis of cells bearing C3b, but not cells bearing antibody alone, by gC suggests that the second effect represents interference with the C3b- C5/5b interaction. This hypothesis is supported by the failure of gC to inhibit reactive lysis when added after C5b67 insertion into target cells. Glycoprotein C does not accelerate C14b2a decay, nor does it impair classical pathway hemolytic efficiency when excess C5 is present. By limiting available C5/5b, some gC inhibition of C3b-C5/5b interactions can be unmasked in the classical pathway system. Glycoprotein C is devoid of factor I co-factor activity. HSV-1 gC is a modulator of complement activation, especially via the alternative pathway, and may represent a novel viral mechanism for evading host defense processes.
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