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Keratin filaments of epithelial and taste-bud cells in the circumvallate papillae of adult and developing mice

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Summary

Keratin filaments of epithelial- and taste-bud cells in the circumvallate papillae of adult and developing mice were studied by immunocytochemistry using monoclonal antikeratin antibodies (PKK2 and PKK3) and by conventional electron microscopy. Elongated cells (type-I,-II, and-III cells) of the taste buds were stained by PKK3 antibody, which reacts with 45-kdalton keratin, whereas basal cells of the taste buds and surrounding epithelial cells showed negative staining with PKK3. Such PKK3-reactive cells occurred at 0 day after birth, when taste-buds first appeared in the dorsal surface epithelium of the papillae. Thus 45-kdalton keratin seems to be an excellent immunocytochemical marker for identifying taste-bud cells. Epithelial cells in all layers of the trench wall and basal layer cells of the dorsal surface contained densely aggregated bundles of keratin filaments that reacted with PKK2 antibody, but not with PKK3. In contrast, taste-bud cells and spinous and granular layer cells of the dorsal surface possessed loose aggregated bundles of filaments that reacted with PKK3, but not with PKK2. These results suggest that the aggregation and distribution pattern of keratin filaments may reflect differences in the keratin subtypes that comprise these filaments.

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  1. Department of Oral Anatomy, Higashi Nippon Gakuen University School of Densistry, Tobetsu, Ishikari, Hokkaido, Japan

    M. Takeda, N. Obara & Y. Suzuki

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  1. M. Takeda
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  2. N. Obara
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  3. Y. Suzuki
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Takeda, M., Obara, N. & Suzuki, Y. Keratin filaments of epithelial and taste-bud cells in the circumvallate papillae of adult and developing mice. Cell Tissue Res 260, 41–48 (1990). https://doi.org/10.1007/BF00297488

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