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Ferrocyanide staining of transferrin and ferritin-conjugated antibody to transferrin

RT Parmley, F Ostroy, RA Gams and L DeLucas

To evaluate the ultrastructural distribution of transferrin on the surface of L1210 ascites tumor cells, we used ferrocyanide to stain ferric iron (Prussian blue reaction) in transferrin, as well as in ferritin conjugated to antibody that was immunologically attached to the transferrin. Small deposits averaging 5 nm in diameter identified transferrin iron, whereas large cuboidal deposits averaging 50 nm in diameter stained ferritin conjugated-antibody that was bound to both transferrin and apotransferrin on the cell surface. The ability of transferrin to deliver iron to ascites tumor cells was confirmed by kinetic studies of transferrin labeled with 59Fe and 125I. These preliminary results are consistent with release of transferrin iron at the cell surface and demonstrate additional uses for ferrocyanide in ultrastructural cytochemical techniques.

Volume 27, Issue 2, pp. 681-685, 02/01/1979
Copyright © 1979 by The Histochemical Society


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J Kaplan
Polypeptide-binding membrane receptors: analysis and classification
Science, April 3, 1981; 212(4490): 14 - 20.
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