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Application of the avidin-biotin system for post-embedding cytochemical demonstration of a biotin-labeled IgG tracer

RJ Seitz, K Heininger, G Schwendemann and KV Toyka

The capacity of the avidin-biotin system for post-embedding cytochemical detection of a biotin-labeled proteinaceous tracer was investigated. By testing modifications of the fixatives, the epoxy embedding medium, and various etching solutions, a procedure was developed to localize specifically the biotinylated tracer on 1-micron thick and thin sections. By use of this technique, a systemically administered IgG tracer was demonstrated after 24 hr throughout the endomysium of mouse skeletal muscle. In the adjoining sciatic nerve, the tracer IgG occurred at the perineurium and within endoneurial blood vessels, although the endoneurium itself was spared because of the presence of the blood-nerve barrier. Because of the small size of the biotin ligand and the non-denaturing method of labeling proteins, our mode of application of the avidin-biotin system appears suitable for tracer studies.

Volume 34, Issue 4, pp. 547-549, 04/01/1986
Copyright © 1986 by The Histochemical Society


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