Effect of Amantadine Hydrochloride on the Response of Human Lymphocytes to Phytohemagglutinin

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Abstract
Amantadine hydrochloride (Symmetrel), which is an antiviral agent marketed for the prevention of infection by influenza virus, inhibits the mitogenic response of human lymphocytes stimulated with phytohemagglutinin. The concentrations which effectively inhibited the response to phytohemagglutinin were similar to those which maximally inhibit virus replication. The drug inhibited the mitogenic response without affecting the ability of phytohemagglutinin to agglutinate leukocytes. The data suggest that phytohemagglutinin, amantadine, and certain lipid-containing RNA viruses take part in cell-membrane interactions of common nature.