Anti-idiotypic antibodies to monoclonal antibodies that neutralize coxsackievirus B4 do not recognize viral receptors.

We have made anti-idiotypic antibodies in rabbits against three mouse monoclonal neutralizing antibodies with specificities for independent epitopes on Coxsackievirus B4. Each of these anti-idiotypic antibodies was found to react specifically with the immunizing monoclonal antibody in radioimmunoassays and did not react with the other monoclonal antibodies. In addition, the anti-idiotypic antibodies specifically inhibited the function (i.e., virus neutralization) of the immunizing antibody. These anti-idiotypic antibodies were tested for their ability to recognize receptors for Coxsackievirus B4 as measured by their ability to inhibit the attachment of radiolabeled virus to cellular receptors. The anti-idiotypic antibodies did not block the binding of Coxsackievirus B4 to monkey kidney cells. Moreover, when tested for their ability to bind to other receptor positive cells, none of the anti-idiotypic antibodies bound above control levels. Anti-idiotypic antibodies did induce a small anti-anti-idiotypic antibody response in mice when tested by radioimmunoassay; however, little if any virus neutralizing activity was found in the sera of these mice. Our results contrast to those reported for anti-idiotypic antibodies in several other virus systems and suggest that not all anti-idiotypic antibodies made against neutralizing antibodies are capable of eliciting an antiviral immune response or binding to viral viral receptors on cells.