The cells and peripheral representation of sodium taste in mice - Nature
- ️Zuker, Charles S.
- ️Wed Jan 27 2010
- Letter
- Published: 27 January 2010
Nature volume 464, pages 297–301 (2010)Cite this article
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Abstract
Salt taste in mammals can trigger two divergent behavioural responses. In general, concentrated saline solutions elicit robust behavioural aversion, whereas low concentrations of NaCl are typically attractive, particularly after sodium depletion1,2,3,4,5. Notably, the attractive salt pathway is selectively responsive to sodium and inhibited by amiloride, whereas the aversive one functions as a non-selective detector for a wide range of salts1,2,3,6,7,8,9. Because amiloride is a potent inhibitor of the epithelial sodium channel (ENaC), ENaC has been proposed to function as a component of the salt-taste-receptor system1,3,6,7,8,9,10,11,12,13,14. Previously, we showed that four of the five basic taste qualities—sweet, sour, bitter and umami—are mediated by separate taste-receptor cells (TRCs) each tuned to a single taste modality, and wired to elicit stereotypical behavioural responses5,15,16,17,18. Here we show that sodium sensing is also mediated by a dedicated population of TRCs. These taste cells express the epithelial sodium channel ENaC19,20, and mediate behavioural attraction to NaCl. We genetically engineered mice lacking ENaCα in TRCs, and produced animals exhibiting a complete loss of salt attraction and sodium taste responses. Together, these studies substantiate independent cellular substrates for all five basic taste qualities, and validate the essential role of ENaC for sodium taste in mice.
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Acknowledgements
We thank W. Guo and A. Becker for generation and maintenance of mouse lines, and K. Scott and members of our laboratories for valuable comments. This research was supported in part by the intramural research program of the NIH, NIDCR (N.J.P.R.). C.S.Z. is an investigator of the Howard Hughes Medical Institute.
Author Contributions J.C. designed the study, carried out electrophysiological and expression studies, analysed data and wrote the paper; C.K. designed and carried out behavioural experiments and analysed expression in engineered and knockout mice; Y.O. designed and carried out calcium imaging experiments and analysed data; D.A.Y. carried out molecular studies and helped write the paper; E.H. provided essential reagents; N.J.P.R. and C.S.Z. designed the study, analysed data and wrote the paper.
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Author notes
Jayaram Chandrashekar, Yuki Oka, David A. Yarmolinsky & Charles S. Zuker
Present address: Present addresses: Janelia Farm Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia 20147, USA (J.C.); Departments of Biochemistry and Molecular Biophysics and of Neuroscience, Howard Hughes Medical Institute, Columbia College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA (Y.O., D.A.Y., C.S.Z.).,
Christina Kuhn and Yuki Oka: These authors contributed equally to this work.
Authors and Affiliations
Howard Hughes Medical Institute and Departments of Neurobiology and Neurosciences, University of California at San Diego, La Jolla, California 92093-0649, USA,
Jayaram Chandrashekar, Yuki Oka, David A. Yarmolinsky & Charles S. Zuker
National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA ,
Christina Kuhn & Nicholas J. P. Ryba
Pharmacology and Toxicology Department, Faculty of Biology and Medicine, University of Lausanne, CH-1005 Lausanne, Switzerland
Edith Hummler
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- Jayaram Chandrashekar
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- Christina Kuhn
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- Yuki Oka
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- David A. Yarmolinsky
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- Edith Hummler
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- Nicholas J. P. Ryba
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Correspondence to Charles S. Zuker.
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C.S.Z. is a scientific founder and scientific advisory board member of Senomyx.
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Chandrashekar, J., Kuhn, C., Oka, Y. et al. The cells and peripheral representation of sodium taste in mice. Nature 464, 297–301 (2010). https://doi.org/10.1038/nature08783
Received: 04 November 2009
Accepted: 05 January 2010
Published: 27 January 2010
Issue Date: 11 March 2010
DOI: https://doi.org/10.1038/nature08783
Editorial Summary
Salt to taste
Mammals are repelled by large concentrations of salts but attracted to low concentrations of sodium. In mice, the latter behaviour can be blocked by the ion-channel inhibitor amiloride. Now mice genetically engineered to lack the drug's target sodium channel, ENaC, in taste receptor neurons have been found to lack both salt sensing and sodium taste responses. Thus sodium sensing, like the four other taste modalities (sweet, sour, bitter and umami), is mediated by dedicated taste-receptor cells. Though because sodium sensing is amiloride-insensitive in primates, how this relates to our ability to taste salt remains unclear.