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Freeze-drying technique in electron microscopic immunohistochemistry

S Hisano, T Adachi and S Daikoku

Postembedding immunocytochemical labeling was performed on sections of rat neurohypophysis prepared by either freeze-drying, vapor fixation and Spurr resin embedding, or conventional aqueous fixation and Spurr resin embedding. Arginine vasopressin (AVP) and oxytocin (OXT) were immunolabeled with protein A-gold-anti-AVP and protein A-gold-anti-OXT complexes, respectively. The freeze-drying procedure (FD) resulted in excellent preservation of ultrastructure and greater antigenicity than the conventional procedure (Con). More gold particles were seen over secretory granules in FD sections than in Con sections. In addition, in FD sections, the gold label was restricted to secretory granules while in Con sections, both the granules and the extragranular axoplasm exhibited label. The two antigens in FD sections could be labeled simultaneously with protein A-small gold particle-anti-OXT complex and protein A-large gold particles-anti-AVP complex. In this way the two antigens were seen to be present in secretory granules within different axon terminals. Thus FD preparations should be useful for demonstrating the presence of multiple antigens in the same granules of nerve terminals.

Volume 33, Issue 5, pp. 485-490, 05/01/1985
Copyright © 1985 by The Histochemical Society


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