Effects of inorganic constituents of saliva on taste responses of the rat chorda tympani nerve

R. Matsuo, T. Yamamoto

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The effects of saliva on the taste responses of the chorda tympani nerve to the 4 standard chemical stimuli (sucrose, NaCl, HCl, and quinine hydrochloride) and water were investigated in anesthetized rats. When the tongue was adapted to pilocarpine-stimulated whole saliva (pH 8.7), the magnitude of neural response to sucrose was about 2 times that obtained when the tongue was adapted to distilled water. Under saliva-adapted conditions, the magnitude of responses to other taste stimuli was reduced by 10-30%, and the water response appeared. These changes were dependent on the concentration of electrolytes (Na+, K+, Cl-, and HCO3-) and on the pH of the saliva. When the tongue was adapted to 10-30 mM NaHCO3 (pH 8.4-8.6), taste and water responses were similar to those under saliva-adapted conditions. Single fiber analyses revealed that the enhancement of the sucrose response after adaptation to NaHCO3 was produced by an increased overall activity of sucrose-responsive fibers. The correlation coefficients of the magnitude of the taste responses between the 4 taste stimuli remained unchanged, but the water response showed a high correlation to HCl and quinine hydrochloride responses after adaptation. Possible mechanisms for the effects of saliva on taste and water responses were discussed.

Original languageEnglish
Pages (from-to)71-80
Number of pages10
JournalBrain Research
Volume583
Issue number1-2
Publication statusPublished - 1992
Externally publishedYes

Fingerprint

Chorda Tympani Nerve
Saliva
Sucrose
Water
Tongue
Quinine
Pilocarpine
Electrolytes

Keywords

  • chorda tympani
  • electrolytes
  • pH
  • rat
  • saliva
  • taste

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Effects of inorganic constituents of saliva on taste responses of the rat chorda tympani nerve. / Matsuo, R.; Yamamoto, T.

In: Brain Research, Vol. 583, No. 1-2, 1992, p. 71-80.

Research output: Contribution to journalArticle

Matsuo, R. ; Yamamoto, T. / Effects of inorganic constituents of saliva on taste responses of the rat chorda tympani nerve. In: Brain Research. 1992 ; Vol. 583, No. 1-2. pp. 71-80.
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