Shared idiotypes of human peripheral blood B and T lymphocytes

In a patient with an IgG lambda monoclonal serum component possessing anti-streptolysin O activity, we have demonstrated peripheral blood B and T lymphocytes with shared or similar idiotypes. The idiotypic T lymphocyte membrane structure was capable of binding the specific antigen (SLO). After radioiodination and subsequent detergent solubilization of the same T cell population, immunoprecipitation of the lysate by employing anti-idiotypic antibodies, resulted in the isolation of a polypeptide chain with a m.w. of 70,000 on SDS polyacrylamide gels under reducing conditions. The polypeptide expressed no isotypic immunoglobulin markers. Internal labeling experiments indicated that this membrane structure was actively synthesized by the T lymphocytes.