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  • Title: Immunolocalization of SNARE proteins in both type II and type III cells of rat taste buds.
    Author: Ueda K, Ichimori Y, Okada H, Honma S, Wakisaka S.
    Journal: Arch Histol Cytol; 2006 Dec; 69(4):289-96. PubMed ID: 17287583.
    Abstract:
    Double immunohistochemistry of soluble N-ethylmaleimide-sensitive fusion protein attachment protein receptor (SNARE) proteins [synaptosomal-associated protein of 25 kDa (SNAP-25), syntaxin and vesicle-associated protein-2 (VAMP-2)], and specific cell markers of taste buds cells [alpha-gustducin and phospholipase Cbeta2 (PLCbeta2) for type II cells; neural cell adhesion molecule (NCAM) for type III cells] was applied to gustatory epithelia of the rat circumvallate papillae. All three SNARE proteins were present in some elongated taste buds cells as well as intra-, peri- and subgemmal nerve fibers. Double immunohisotochemistry revealed that nearly all alpha-gustducin and PLCbeta2 immunoreactive cells expressed SNAP-25, syntaxin, and VAMP-2. A majority of NCAM immunoreactive cells showed immunoreactivity for these SNARE proteins. These results indicate that these synapse-associated proteins (SNAP-25, syntaxin and VAMP-2) are present in both type II cells and type III cells. Moreover, more than 50% of intragemmal cells containing SNARE proteins showed immunoreactivities for alpha-gustducin, PLCbeta2, and NCAM, suggesting the possible presence of transitional cells having histochemical properties of both type II and type III cells.
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