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Ultrastructural localization of viral antigens using the unlabeled antibody-enzyme method

G Wendelschafer-Crabb, SL Erlandsen and DH Walker

Employing the unlabeled antibody enzyme method at the ultrastructural level, a comparison was made between preembedding staining and postembedding staining for the detection of viral antigens. The bacteriophage P1 absorbed to the surface of Shigella dysenteriae was used as a model system. Preembedding staining resulted in the specific deposition of peroxidase-antiperoxidase (PAP) complexes as an electron- dense coating around the viral heads. Disadvantages of the preembedding staining method included the agglutination of cells by the primary antiserum which produced a gradient of specific staining and the "bleeding" or migration of electron dense reaction product away from the sites of attached PAP complexes. The postembedding staining method had distinct advantages over the preembedding staining in that PAP complexes were deposited directly over exposed viral heads within the thin section. In addition, the specific immunostaining of viruses was uniform through the section and no artifactual migration of reaction product was observed.

Volume 24, Issue 3, pp. 517-526, 03/01/1976
Copyright © 1976 by The Histochemical Society


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