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The Journal of Immunology, Vol 130, Issue 6 2915-2919, Copyright © 1983 by American Association of Immunologists

ARTICLES

Infection of a macrophage-like cell line, P388D1 with reovirus; effects of immune ascitic fluids and monoclonal antibodies on neutralization and on enhancement of viral growth

SJ Burstin, MW Brandriss and JJ Schlesinger

We studied the effect of antibody on the growth of reovirus, serotypes 1 and 3, in P388D1, a continuous mouse macrophage-like cell line. Enhanced growth of virus was observed when cells were infected in the presence of nonneutralizing monoclonal antibodies or subneutralizing concentrations of either immune ascitic fluids or neutralizing monoclonal antibodies. Both enhancement of viral growth and neutralization were accompanied by an antibody-mediated increase in binding of radiolabeled virus to P388D1 cells. Although neutralization was seen only with monoclonal antibodies directed toward the sigma-1 surface protein of the virus, enhancement was observed with two monoclonal antibodies directed toward other surface proteins. Trypsin treatment of P388D1 cells abrogated enhanced growth of virus mediated by a mouse IgG2a antibody; preincubation with P388D1 with human IgG1 but not IgG2 myeloma proteins also abrogated enhancement by immune ascitic fluid or monoclonal antibody. These observations are compatible with known properties of P388D1 Fc receptors and support the role of the Fc receptor in antibody-mediated infection.


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