Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Food & Nutrition Science Regular Papers
G-Protein-Dependent and -Independent Pathways in Denatonium Signal Transduction
Shoko SAWANOEri SETOTomohiko MORIYukako HAYASHI
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JOURNAL FREE ACCESS

2005 Volume 69 Issue 9 Pages 1643-1651

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Abstract

To clarify the involvement of G protein in denatonium signal transduction, we carried out a whole-cell patch-clamp analysis with isolated taste cells in mice. Two different responses were observed by applying GDP-β-S, a G-protein inhibitor. One response to denatonium was reduced by GDP-β-S (G-protein-dependent), whereas the other was not affected (G-protein-independent). These different patterns were also observed by concurrently inhibiting the phospholipase C β2 and phosphodiesterase pathways via G protein. These data suggest dual, G-protein-dependent and -independent mechanisms for denatonium. Moreover, the denatonium responses were not attenuated by singly inhibiting the phospholipase C β2 or phosphodiesterase pathway, implying that both pathways were involved in G-protein-dependent transduction. In the G-protein-independent cells, the response was abolished by the depletion of calcium ions within the intracellular store. These results suggest that Ca2+ release from the intracellular store is an important factor. Our data demonstrate multiple transduction pathways for denatonium in mammalian taste cells.

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© 2005 by Japan Society for Bioscience, Biotechnology, and Agrochemistry
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