| Umami taste receptor functions as an amino acid sensor via Gαs subunit in N1E-115 neuroblastoma cells. | |
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MedLine Citation:
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PMID: 22189795 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The sensing of the nutritional level of the body fluid is pivotal for maintaining homeostasis in animals. However, it is not yet understood how the cells detect nutritional levels. In the present study, we examined the function of umami taste receptor, which has a dimeric protein structure composed of Tas1r1 and Tas1r3, as amino acid sensor in the cells. We found that deprivation of amino acids induced neurite outgrowth in N1E-115 cells. The neurite outgrowth was inhibited by almost all of the amino acids tested. To investigate the involvement of the umami taste receptor, siRNA against each of Tas1r1 or Tas1r3 was administered, resulting in suppression of the inhibitory effects of amino acids on neurite outgrowth. In addition, inosine 5'-monophosphate, which potentiates the response to amino acids in the taste cells, enhanced the inhibitory effect of glutamine on neurite outgrowth. These results suggest that Tas1r1 + 3 functions as an amino acid sensor in N1E-115 cells. Because glutamine increased intracellular cAMP concentration, we investigated the involvement of the Gαs subunit of the heterotrimeric G protein in signal transduction. The treatments to inhibit the Gαs subunit significantly suppressed the increase of intracellular cAMP concentration induced by glutamine and the inhibitory effect of amino acids on neurite outgrowth. In addition, the reagents for increasing intracellular cAMP concentration inhibited neurite outgrowth induced by deprivation of amino acids. We concluded that Tas1r1 + 3 functions as an amino acid sensor and activates the intracellular signaling pathway through the Gαs subunit in N1E-115 cells. J. Cell. Biochem. © 2011 Wiley Periodicals, Inc. |
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Authors:
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Yoshikage Muroi; Toshiaki Ishii |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-20 |
Journal Detail:
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Title: Journal of cellular biochemistry Volume: - ISSN: 1097-4644 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8205768 Medline TA: J Cell Biochem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Wiley Periodicals, Inc. |
Affiliation:
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Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro Hokkaido, 080-8555, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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