Double immunocytochemical staining in the study of antibody-producing cells in vivo. Combined detection of antigen specificity (anti-TNP) and (sub)class of intracellular antibodies.

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Abstract
Mice and rabbits were immunized with trinitrophenyl (TNP)-conjugated keyhole limpet hemocyanin (KLH). Cells producing specific antibodies against the hapten TNP were detected in vivo in spleen and lymph nodes using a TNP--alkaline phosphatase (AP) conjugate. Using horseradish peroxidase (HRP)-conjugated anti-mouse (sub)class (IgG2A, IgG2B, IgM) antibodies and anti-rabbit class (IgG, IgM) antibodies and a double immunocytochemical staining technique for simultaneous demonstration of the enzymes AP and HRP, we were able to determine both the antigen specificity (anti-TNP) and the (sub)class of intracellular antibodies produced by individual antibody-forming cells in vivo.

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