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Ultrastructural localization of HTLV-I gag proteins p19 and p24 by single and double immunogold labeling

G Stransky and S Gay

Department of Medicine, University of Alabama, Birmingham 35294.

We developed a post-embedding immunogold labeling procedure for the ultrastructural localization of the HTLV-I gag proteins p19 and p24 by the use of monoclonal antibodies (MAb). Both antigens were shown to withstand fixation with 1% glutaraldehyde. In addition, p19 antigenicity was found not to be affected by post-fixation with 1% osmium tetroxide. The choice of resin played a decisive role in the retention of antigenicity. P19 was preserved in Lowicryl K4M as well as in LR White, whereas p24 was preserved only in Lowicryl. Both p19 and p24 were found to be localized on the HTLV-I virions themselves, whereas no positive immunostaining could be observed on the infected cells. In Lowicryl-embedded samples, in which both antigens had been preserved, a double immunogold labeling procedure was performed that allowed the co-localization of p19 and p24 on the same section. In osmicated LR White-embedded samples the quality of ultrastructural preservation of HTLV-I virions was found to be comparable to results obtained with the traditional glutaraldehyde-osmium tetroxide-epoxy resin processing.

Volume 39, Issue 2, pp. 185-191, 02/01/1991
Copyright © 1991 by The Histochemical Society


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