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Antigen unmasking for immunoelectron microscopy: labeling is improved by treating with sodium ethoxide or sodium metaperiodate, then heating on retrieval medium
JW Stirling and PS Graff
Department of Histopathology, Flinders Medical Centre, Bedford Park, South Australia.
To optimize the ultrastructural localization of immunoglobulin G in corneal crystalloid deposits, we compared a range of antigen unmasking techniques. A human corneal biopsy specimen was fixed in formalin, post- osmicated, and embedded in epoxy resin for electron microscopy. Thin sections were immunogold-labeled for IgG after treatment with sodium ethoxide or sodium metaperiodate. Sections were also treated by heating them at 95 degrees C while they floated on water, 0.01 M citrate buffer (pH 6.0), or sodium metaperiodate. The treatments were applied separately and combined. After labeling, crystalloids in untreated sections had a probe density of 5 particles/microns2. Crystalloids in sections treated only with sodium ethoxide or sodium metaperiodate had probe densities of 15-20 particles/microns2. Sodium ethoxide combined with heating on water, or citrate buffer, gave probe densities of 140- 160 particles/microns2. Sodium metaperiodate combined with heating on citrate buffer gave the highest probe density (195 particles/microns2). Although sodium ethoxide coupled with heating increased probe density, the ethoxide etched the sections and caused unacceptable damage. Treatment with sodium metaperiodate followed by heating on citrate buffer is recommended for antigen unmasking. This combination gave a high probe density and sections remained intact, with good ultrastructural detail.
Volume 43,
Issue 2,
pp. 115-123,
02/01/1995
Copyright © 1995 by The Histochemical Society
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