Expression, regulation and putative nutrient-sensing function of taste GPCRs in the heart

Foster, Simon R., Porrello, Enzo R., Purdue, Brooke, Chan, Hsiu-Wen, Voigt, Anja, Frenzel, Sabine, Hannan, Ross D., Moritz, Karen M., Simmons, David G., Molenaar, Peter, Roura, Eugeni, Boehm, Ulrich, Meyerhof, Wolfgang, & Thomas, Walter G. (2013) Expression, regulation and putative nutrient-sensing function of taste GPCRs in the heart. PLoS ONE, 8(5), e64579.

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Abstract

G protein-coupled receptors (GPCRs) are critical for cardiovascular physiology. Cardiac cells express >100 nonchemosensory GPCRs, indicating that important physiological and potential therapeutic targets remain to be discovered. Moreover, there is a growing appreciation that members of the large, distinct taste and odorant GPCR families have specific functions in tissues beyond the oronasal cavity, including in the brain, gastrointestinal tract and respiratory system. To date, these chemosensory GPCRs have not been systematically studied in the heart. We performed RT-qPCR taste receptor screens in rodent and human heart tissues that revealed discrete subsets of type 2 taste receptors (TAS2/Tas2) as well as Tas1r1 and Tas1r3 (comprising the umami receptor) are expressed. These taste GPCRs are present in cultured cardiac myocytes and fibroblasts, and are enriched in myocytes, which we corroborated using in situ hybridization. Tas1r1 gene-targeted mice (Tas1r1Cre/Rosa26tdRFP) strikingly recapitulated these data. In vivo taste receptor expression levels were developmentally regulated in the postnatal period. Intriguingly, several Tas2rs were upregulated in cultured rat myocytes and in mouse heart in vivo following starvation. The discovery of taste GPCRs in the heart opens an exciting new field of cardiac research. We predict that these taste receptors may function as nutrient sensors in the heart.

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ID Code: 68389
Item Type: Journal Article
Refereed: Yes
Keywords: Taste Receptor, TAS1R, TAS2R, heart, cardiomyocyte, nutrient
DOI: 10.1371/journal.pone.0064579
ISSN: 1932-6203
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CARDIOVASCULAR MEDICINE AND HAEMATOLOGY (110200) > Cardiology (incl. Cardiovascular Diseases) (110201)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PHARMACOLOGY AND PHARMACEUTICAL SCIENCES (111500) > Basic Pharmacology (111501)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2013 Foster et al.
Copyright Statement: This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Deposited On: 12 Mar 2014 23:14
Last Modified: 09 Jan 2017 19:18

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