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Penetration of immunoreagents in Vibratome-sectioned brain: a light and electron microscopic study

DT Piekut and SM Casey

Immunocytochemical studies on the localization of peptides at the ultrastructural level have most frequently involved the application of the peroxidase--antiperoxidase (PAP) method of immunocytochemistry and the use of the preembedding or postembedding staining procedures. The present study was designed to determine the depth of penetration of Vibratome tissue sections by immunoreagents used in the preembedding method in which immunostaining of unembedded fixed tissue sections is accomplished prior to tissue dehydration and embedment. Our data indicate that penetration of immunoreagents is restricted to the superficial 8-9 micrometers of a 80-micrometers thick Vibratome tissue section of hypothalamus of brain using antisera generated against arginine vasopressin. The final immunoreaction product visualized in a Vibratome tissue section may reflect only a fraction of the amount of hormone contained within the thickness of the tissue section.

Volume 31, Issue 5, pp. 669-674, 05/01/1983
Copyright © 1983 by The Histochemical Society


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