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J Virol. 1993 March; 67(3): 1278-1285

Herpes simplex virus type 1-induced hemagglutination: glycoprotein C mediates virus binding to erythrocyte surface heparan sulfate.

Department of Medicine, University of Minnesota School of Medicine, Minneapolis 554551.

ABSTRACT

We recently reported that herpes simplex virus type 1 (HSV-1) can cause agglutination of murine erythrocytes (E. Trybala, Z. Larski, and J. Wisniewski, Arch. Virol. 113:89-94, 1990). We now demonstrate that the mechanism of this hemagglutination is glycoprotein C-mediated binding of virus to heparan sulfate moieties at the surface of erythrocytes. Hemagglutination was found to be a common property of all gC-expressing laboratory strains and clinical isolates of HSV-1 tested. Mutants of HSV-1 deficient in glycoprotein C caused no specific hemagglutination, whereas their derivatives transfected with a functional gC-1 gene, thus reconstituting gC expression, regained full hemagglutinating activity. Hemagglutination activity was inhibited by antibodies against gC-1 but not by antibodies with specificity for glycoproteins gB, gD, or gE or by murine antiserum raised against the MP strain of HSV-1, which is gC deficient. Finally, purified gC-1 protein, like whole HSV-1 virions, showed high hemagglutinating activity which was inhibited by heparan sulfate and/or heparin and was completely prevented by pretreatment of erythrocytes with heparitinase, providing evidence that gC-1 mediates hemagglutination by binding to heparan sulfate at the cell surface. Thus, HSV-1-induced hemagglutination is gC-1 dependent and resembles the recently proposed mechanism by which HSV-1 attaches to surface heparans on susceptible cells, providing a simple model for initial events in the virus-cell interaction.

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