Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
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Effect of Quinine Solutions on Intracellular Ca2+ Levels in Neuro-2a Cells—Conventional Physiological Method for the Evaluation of Bitterness—
Tomoko Nakamura, Takeshi Akiyoshi, Naoko Tanaka, Kazumasa Shinozuka, Sumio Matzno, Toshikatsu Nakabayashi, Kenji Matsuyama, Makoto Kashiwayanagi, Takahiro Uchida
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Keywords: bitterness, neuro-2a cell, intracellular Ca2+, taste sensor, thapsigargin, quinine
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2003 Volume 26 Issue 11 Pages 1637-1640

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Abstract

The purpose of the present study was to examine the effect of quinine on intracellular Ca2+ ([Ca2+]i) levels in cultured neuro-2a cells, and to investigate the possibility of using [Ca2+]i levels to predict the bitterness of quinine solutions. [Ca2+]i levels in neuro-2a cells increased following stimulation by quinine in a concentration-related manner. There was a good linear correlationship between the quinine-induced increase in [Ca2+]i levels increase and the bitterness scores of the quinine solutions as assessed in human gustatory sensation tests (r2=0.918). The quinine-induced increase in [Ca2+]i levels was inhibited by thapsigargin (an inhibitor of the Ca2+ pump into intracellular stores), U73122 (an inhibitor of phospholipase C) and ω-conotoxin (an N-type Ca2+-channel blocker), but not by nifedipine (an L-type Ca2+-channel blocker).

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© 2003 The Pharmaceutical Society of Japan
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