The taste transduction channel TRPM5 is a locus for bitter‐sweet taste interactions

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  • Karel Talavera
    Laboratory of Ion Channel Research Department of Molecular Cell Biology KU Leuven Leuven Belgium
  • Keiko Yasumatsu
    Section of Oral Neuroscience Graduate School of Dental Sciences Kyushu University Fukuoka Japan
  • Ryusuke Yoshida
    Section of Oral Neuroscience Graduate School of Dental Sciences Kyushu University Fukuoka Japan
  • Robert F. Margolskee
    Department of Neuroscience Mount Sinai School of Medicine New York New York USA
  • Thomas Voets
    Laboratory of Ion Channel Research Department of Molecular Cell Biology KU Leuven Leuven Belgium
  • Yuzo Ninomiya
    Section of Oral Neuroscience Graduate School of Dental Sciences Kyushu University Fukuoka Japan
  • Bernd Nilius
    Laboratory of Ion Channel Research Department of Molecular Cell Biology KU Leuven Leuven Belgium

書誌事項

公開日
2007-12-10
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1096/fj.07-9591com
公開者
Wiley

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説明

<jats:p> Ordinary gustatory experiences, which are usually evoked by taste mixtures, are determined by multiple interactions between different taste stimuli. The most studied model for these gustatory interactions is the suppression of the responses to sweeteners by the prototype bitter compound quinine. Here we report that TRPM5, a cation channel involved in sweet taste transduction, is inhibited by quinine (EC <jats:sub>50</jats:sub> =50 μM at —50 mV) owing to a decrease in the maximal whole‐cell TRPM5 conductance and an acceleration of channel closure. Notably, quinine inhibits the gustatory responses of sweet‐sensitive gustatory nerves in wild type (EC <jats:sub>50</jats:sub> =§1.6 mM) but not in <jats:italic>Trpm5</jats:italic> knockout mice. Quinine induces a dose‐ and time‐dependent inhibition of TRPM5‐dependent responses of single sweet‐sensitive fibers to sucrose, according to the re stricted diffusion of the drug into the taste tissue. Quinidine, the stereoisomer of quinine, has similar effects on TRPM5 currents and on sweet‐induced gus tatory responses. In contrast, the chemically unrelated bitter compound denatonium benzoate has an § 100 fold weaker effect on TRPM5 currents and, accord ingly, at 10 mM it does not alter gustatory responses to sucrose. The inhibition of TRPM5 by bitter compounds constitutes the molecular basis of a novel mechanism of taste interactions, whereby the bitter tastant inhibits directly the sweet transduction pathway.—Talavera, K., Yasumatsu, K., Yoshida, R., Margolskee, R. F., Voets, T., Ninomiya, Y., Nilius, B. The taste transduction channel TRPM5 is a locus for bitter‐sweet taste inter actions. FASEBJ. 22, 1343–1355 (2008) </jats:p>

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