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Immunocytochemical localization of S-100 beta beta protein in olfactory and supporting cells of lamb olfactory epithelium

MG Rambotti, C Saccardi, A Spreca, MC Aisa, I Giambanco and R Donato

Department of Experimental Medicine and Biochemical Sciences, University of Perugia, Italy.

By immunocytochemistry, we have identified two novel cell types, olfactory and supporting cells of lamb olfactory epithelium, expressing S-100 beta beta protein. S-100 immune reaction product was observed on ciliary and plasma membranes, on axonemes and in the cytoplasm adjacent to plasma membranes and to basal bodies of olfactory vesicles. A brief treatment of olfactory mucosae with Triton X-100 before fixation is necessary for detection of S-100 beta beta protein within olfactory vesicles. In the absence of such a treatment, the immune reaction product is restricted to ciliary and plasma membranes. On the other hand, irrespective of pre-treatment of olfactory mucosae, S-100 beta immune reaction product in supporting cells is restricted to microvillar and plasma membranes. The anti-S-100 beta antiserum used in these studies does not bind to basal cells of the olfactory epithelium or to cells of the olfactory glands, whereas it binds to Schwann cells of the olfactory nerve. An anti-S-100 alpha antiserum does not bind to cellular elements of the olfactory mucosa, Schwann cells, or axons of the olfactory nerve. The present data provide, for the first time, evidence for the presence of S-100 beta beta protein in mammalian neurons (olfactory cells).

Volume 37, Issue 12, pp. 1825-1833, 12/01/1989
Copyright © 1989 by The Histochemical Society


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