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The Effect Of Glossopharyngeal Nerve Transection On The Taste Buds Of The Rat Valuate Papilla

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¹éº´ÁÖ/Byeong Ju Baik ±èÀç°ï/Â÷°æ/³ë¿ë°ü/¹Úº´°Ç/Jae Gon Kim/Kyung Cha/Yong Kwan Rho/Byung Keon Park

Abstract

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#ÃÊ·Ï#
The effect of glossopharyngeal nerve transection on the taste buds of the rat vallate
papilla was examined by using the method of DNA nick-end labeling(TUNEL) and
standard electron microscopic technique at 1, 3, 5, 7, 9 days after denervation. In
general, the number and size of taste buds decreased as more days passed after
denervation. They started decreasing on day 3 post denervation and virtually all taste
buds were disappeared on day 9 post denervation. In studies using TUNEL method,
TUNEL positive cells markedly increased in their numbers one day post denervation, as
compared with controls. The number of apoptotic taste bud cells per taste bud profile
was averaged to be 0.64 and 0.44 for day 1 and 3 post denervation, respectively,
whereas it was 0.10 in controls. In electron microscopy, apoptotic cells were identified
by the presence of condensed and fragmentary nuclei in a cytoplasm, which resulted in
increased density. In control rats, only few apoptotic cells were found. On days 1 and 3
post denervation, nerve fibers almost disappeared from the taste buds and some
apoptotic cells were apparent. On days 7 and 9 post denervation, a few taste bud cells
were still present in the epithelium of the bottom of the trench wall of the vallate
papilla and most of them showed apoptotic changes. The results indicate that the death
of taste bud cells in normal conditions is controlled by apoptosis and the decrease and
disappearance of taste buds after denervation is also caused by apoptosis of taste bud
cells.

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