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A simple two-step labeling procedure for ultrastructural localization of cell surface anionic sites

E Skutelsky and EA Bayer

We propose a new method for ultrastructural localization of cell surface anionic sites. The method consists of sequential interaction of aldehyde-fixed cells with a polycationic reagent, poly-L-lysine (PL), followed by secondary interaction with a negatively charged marker, ferritin. By use of PL of low molecular weight (4000) on aldehyde-pre- fixed red blood cells and macrophages, the reaction resulted in binding of ferritin particles to cell surface anionic sites with a density distribution resembling that of cationized ferritin (CF). The density of the attached ferritin molecules increased in direct correlation with the MW of PL used. The primary PL interaction can be carried out at low pH (less than 2), thus restricting the labeling mainly to membrane- bound sialyl residues.

Volume 35, Issue 10, pp. 1063-1067, 10/01/1987
Copyright © 1987 by The Histochemical Society


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