Localization of phosphatidylinositol signaling components in rat taste cells: Role in bitter taste transduction

Paul M. Hwang, Ajay Verma, David S. Bredt, Solomon H. Snyder

Research output: Contribution to journalArticle


To assess the role of phosphatidylinositol turnover in taste transduction we have visualized, in rat tongue, ATP-dependent endoplasmic reticular accumulation of 45Ca2+, inositol 1,4,5-trisphosphate receptor binding sites, and phosphatidylinositol turnover monitored by autoradiography of [3H]cytidine diphosphate diacylglycerol formed from [3H]cytidine. Accumulated 45Ca2+, inositol 1,4,5-trisphosphate receptors, and phosphatidylinositol turnover are selectively localized to apical areas of the taste buds of circumvallate papillae, which are associated with bitter taste. Further evidence for a role of phosphatidylinositol turnover in bitter taste is our observation of a rapid, selective increase in mass levels of inositol 1,4,5-trisphosphate elicited by low concentrations of denatonium, a potently bitter tastant.

Original languageEnglish (US)
Pages (from-to)7395-7399
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number19
StatePublished - Jan 1 1990



  • Circumvallate papillae
  • Cytidine diphosphate diacylglycerol
  • Denatonium
  • Inositol 1,4,5-trisphosphate
  • Von Ebner's gland

ASJC Scopus subject areas

  • General

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