Chem. Senses 24: 255-261,
1999
© Oxford University Press
Immunohistochemical Localization of Carbonic Anhydrase Isozyme II in the Gustatory Epithelium of the Adult Rat
1 Department of Oral Anatomy and Developmental Biology, 2 Division of Dentistry for the Disabled, 3 Department of Oral Pathology, Osaka University Faculty of Dentistry, Osaka 4 Department of Oral Anatomy, Niigata University School of Dentistry, Niigata, Japan
Correspondence to be sent to: Satoshi Wakisaka, Department of Oral Anatomy Developmental Biology, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565-0871, Japan. e-mail:wakisaka{at}dent.osaka-u.ac.jp
The distribution of carbonic anhydrase isozyme II (CA II)-like immunoreactivity (-LI) in the gustatory epithelium was examined in the adult rat. In the circumvallate and foliate papillae, CA II-LI was observed in the cytoplasm of the spindle-shaped taste bud cells, with weak immunoreaction in the surface of the gustatory epithelium. No neuronal elements displayed CA II-LI in these papillae. There was no apparent difference in the distribution pattern between the anterior and posterior portions of the foliate papillae. In immunoelectron microscopy, immunoreaction products for CA II were diffusely distributed in the entire cytoplasm of the taste bud cells having dense round granules at the periphery of the cells. No taste bud cells displaying CA II-LI were detected in the fungiform papillae, but a few thick nerve fibers displayed CA II-LI. In the taste buds of the palatal epithelium, neither taste bud cells nor neuronal elements exhibited CA II-LI. The present results indicate that CA II was localized in the type I cells designated as supporting cells in the taste buds located in the posterior lingual papillae of the adult animal.
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