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Immunohistochemical localization of polysialic acid in tissue sections: differential binding to polynucleotides and DNA of a murine IgG and a human IgM monoclonal antibody

M Husmann, J Roth, EA Kabat, C Weisgerber, M Frosch and D Bitter-Suermann

Institute for Medical Microbiology, University of Mainz, Federal Republic of Germany.

For immunolocalization of alpha(2-8)-linked polysialic acid, which forms part of the neural cell adhesion molecule (N-CAM), two monoclonal antibodies, MAb735 and IgMNOV, were employed. Both antibodies have previously been shown to bind the extremely low immunogenic capsular polysaccharide of group B meningococci, which also consists of alpha(2- 8) polysialic acid, but not to other, even closely related forms of polysialic acid. Despite the identical polysaccharide specificity of these two MAb, we observed marked differences of the staining pattern in tissue sections. We showed that these differences in immunostaining were due to the crossreactivity of IgMNOV with polynucleotides and DNA. MAb735, however, was shown to react exclusively with alpha(2-8) polysialic acid. Moreover, the specificity of MAb735 proved to be unique among eleven other MAb directed against various bacterial polysaccharides, as it was the only one unreactive with polynucleotides. Thus, MAb735, the only IgG type mouse monoclonal antibody to polysialic acid thus far reported, can be considered a specific probe for the unambiguous detection of alpha(2-8) polysialic acid in tissue sections, and should therefore help to further elucidate the role of polysialic acid in developmental processes.

Volume 38, Issue 2, pp. 209-215, 02/01/1990
Copyright © 1990 by The Histochemical Society


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