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A trinitrophenyl(TNP)-poly-L-lysine-horseradish peroxidase conjugate for the detection of anti-TNP antibodies in vivo

E Claassen and N Van Rooijen

A new conjugate for the detection of anti-trinitrophenyl(TNP) antibodies was developed to study the localization pattern of specific antibody containing cells and extracellular antibody in vivo. By means of a bridging molecule, poly-L-lysine, nine TNP groups and six horseradish peroxidase (HRP) groups were joined in one conjugate. Thus a higher specificity (more hapten) was united with a higher staining intensity (more enzyme) in the same conjugate. This conjugate made possible the simultaneous detection of anti-TNP antibody containing cells and establishment of their class (immunoglobulin M (IgM) and IgG). It was also used for the demonstration of anti-TNP antibodies in tissues where a TNP-alkaline phosphate (AP) conjugate could not be used due to high AP (endogenous) background staining. Thus we demonstrated anti-TNP antibody containing cells in gut associated lymphoid tissue and anti-TNP-(TNP-ovalbumin) immune complexes in the glomeruli of the kidney. We suggest that poly-L-lysine is a suitable bridging molecule for the preparation of hapten-HRP conjugates.

Volume 33, Issue 8, pp. 840-844, 08/01/1985
Copyright © 1985 by The Histochemical Society


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