Abstract
Taste stimulus adsorption is believed to occur at the taste cell microvillous membrane1,2. But due to technical difficulties of inserting glass electrodes into the mammalian taste cell, little is known about the mechanisms of taste transduction3–12. Reliable intracellular recordings are necessary to determine the characteristics of taste cells. This has been accomplished previously in the mouse8–12 and is reported here. Recent experiments indicated that cyclic nucleotides can act on the inner surface of the membranes of a variety of cells to alter their ion-channel activity13–22, and these substances might act as intracellular transmitters in taste cells. But tight junctions found at the apical membrane of mam-malian taste cells do not allow stimuli to enter the taste bud, making it difficult to alter the environment of the taste cell by perfusing with chemical solutions23. Here we report that cyclic AMP, cyclic GMP, EGTA or tetraethyl-ammonium electrophoretically injected into the mouse taste cell induce membrane depolarization and increased membrane resistance. These results suggest that a cyclic nucleotide enzymatic cascade, modulated by calcium ions, may mediate the potassium permeability that controls taste, in a way analogous to visual and olfactory transduction.
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Tonosaki, K., Funakoshi, M. Cyclic nucleotides may mediate taste transduction. Nature 331, 354–356 (1988). https://doi.org/10.1038/331354a0
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DOI: https://doi.org/10.1038/331354a0
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