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Gut-expressed gustducin and taste receptors regulate secretion of glucagon-like peptide-1

PNAS, 18 September 2007
Vol. 104, Issue 38, p. 15069-15074
DOI: 10.1073/pnas.0706890104

Gut-expressed gustducin and taste receptors regulate secretion of glucagon-like peptide-1

  1. Hyeung-Jin Jang *,
  2. Zaza Kokrashvili ,
  3. Michael J. Theodorakis *,
  4. Olga D. Carlson *,
  5. Byung-Joon Kim *,
  6. Jie Zhou *,
  7. Hyeon Ho Kim *,
  8. Xiangru Xu *,
  9. Sic L. Chan *,
  10. Magdalena Juhaszova *,
  11. Michel Bernier *,
  12. Bedrich Mosinger ,
  13. Robert F. Margolskee , , and
  14. Josephine M. Egan *
  1. *National Institute on Aging/National Institutes of Health, 5600 Nathan Shock Drive, Baltimore, MD 21224; and
  2. Department of Neuroscience, Mount Sinai School of Medicine, 1425 Madison Avenue, Box 1065, New York, NY 10029
  1. Communicated by Linda M. Bartoshuk, University of Florida, Gainesville, FL, July 23, 2007 (received for review May 16, 2007)

Abstract

Glucagon-like peptide-1 (GLP-1), released from gut endocrine L cells in response to glucose, regulates appetite, insulin secretion, and gut motility. How glucose given orally, but not systemically, induces GLP-1 secretion is unknown. We show that human duodenal L cells express sweet taste receptors, the taste G protein gustducin, and several other taste transduction elements. Mouse intestinal L cells also express α-gustducin. Ingestion of glucose by α-gustducin null mice revealed deficiencies in secretion of GLP-1 and the regulation of plasma insulin and glucose. Isolated small bowel and intestinal villi from α-gustducin null mice showed markedly defective GLP-1 secretion in response to glucose. The human L cell line NCI-H716 expresses α-gustducin, taste receptors, and several other taste signaling elements. GLP-1 release from NCI-H716 cells was promoted by sugars and the noncaloric sweetener sucralose, and blocked by the sweet receptor antagonist lactisole or siRNA for α-gustducin. We conclude that L cells of the gut “taste” glucose through the same mechanisms used by taste cells of the tongue. Modulating GLP-1 secretion in gut “taste cells” may provide an important treatment for obesity, diabetes and abnormal gut motility.

  • enteroendocrine cells
  • gastrointestinal chemosensation
  • glucose sensor
  • incretin

Footnotes

  • To whom correspondence should be addressed. E-mail: robert.margolskee{at}mssm.edu
  • Author contributions: H.-J.J., Z.K., and M.J.T. contributed equally to this work; H.-J.J., Z.K., M.J.T., B.M., R.F.M., and J.M.E. designed research; H.-J.J., Z.K., M.J.T., O.D.C., B.-J.K., J.Z., H.H.K., X.X., S.L.C., M.J., M.B., and B.M. performed research; M.J.T. contributed new reagents/analytic tools; H.-J.J., Z.K., M.J.T., O.D.C., B.-J.K., J.Z., H.H.K., X.X., S.L.C., M.J., M.B., B.M., R.F.M., and J.M.E. analyzed data; and H.-J.J., M.J.T., R.F.M., and J.M.E. wrote the paper.

  • Conflict of interest statement: Dr. Margolskee has a personal financial interest in the form of stock ownership in the Redpoint Bio company, receives consulting fees from the Redpoint Bio company, and is an inventor on patents and patent applications which have been licensed to the Redpoint Bio company.

  • This article contains supporting information online at www.pnas.org/cgi/content/full/0706890104/DC1.

  • Abbreviations:
    [Ca2+]i,
    intracellular Ca2+ concentration;
    GIP,
    glucose-dependent insulinotropic polypeptide;
    GLP-1,
    glucagon-like peptide-1;
    IF,
    immunofluorescence;
    T1R,
    type 1 taste receptor.

Citation:

H.-J. Jang, Z. Kokrashvili, M. J. Theodorakis, O. D. Carlson, B.-J. Kim, J. Zhou, H. H. Kim, X. Xu, S. L. Chan, M. Juhaszova, M. Bernier, B. Mosinger, R. F. Margolskee, and J. M. Egan, Gut-expressed gustducin and taste receptors regulate secretion of glucagon-like peptide-1. PNAS 104, 15069-15074 (2007).

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