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Previous studies have shown that mice immunized with TNP-Ficoll when young, adult, or aged expressed different repertoires of anti-TNP antibodies. The aim of the present study was to find out whether this age-related nonrandom progression was driven by antigen, and whether it was regulated by the immune network through surface-Ig receptors on B lymphocytes. The approach utilized was to block receptor expression on B lymphocytes of mice by the chronic administration of anti-IgM from birth for approximately 1 year, and then compare their subsequent antibody response to that of age-matched control animals. The results obtained have shown that the age-dependent shift in the anti-TNP repertoire expressed could take place in animals whose B lymphocytes were blind to antigen and anti-id for the greater part of their lives and thus suggest that the regulatory events responsible for this shift may be (surface Ig) receptor independent.
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