Modulation of taste sensitivity by GLP-1 signaling

Yu Kyong Shin, Bronwen Martin, Erin Golden, Cedrick D. Dotson, Stuart Maudsley, Wook Kim, Hyeung Jin Jang, Mark P. Mattson, Daniel J. Drucker, Josephine M. Egan, Steven D. Munger

Research output: Contribution to journalArticlepeer-review

Abstract

In many sensory systems, stimulus sensitivity is dynamically modulated through mechanisms of peripheral adaptation, efferent input, or hormonal action. In this way, responses to sensory stimuli can be optimized in the context of both the environment and the physiological state of the animal. Although the gustatory system critically influences food preference, food intake and metabolic homeostasis, the mechanisms for modulating taste sensitivity are poorly understood. In this study, we report that glucagon-like peptide-1 (GLP-1) signaling in taste buds modulates taste sensitivity in behaving mice. We find that GLP-1 is produced in two distinct subsets of mammalian taste cells, while the GLP-1 receptor is expressed on adjacent intragemmal afferent nerve fibers. GLP-1 receptor knockout mice show dramatically reduced taste responses to sweeteners in behavioral assays, indicating that GLP-1 signaling normally acts to maintain or enhance sweet taste sensitivity. A modest increase in citric acid taste sensitivity in these knockout mice suggests GLP-1 signaling may modulate sour taste, as well. Together, these findings suggest a novel paracrine mechanism for the regulation of taste function.

Original languageEnglish (US)
Pages (from-to)455-463
Number of pages9
JournalJournal of Neurochemistry
Volume106
Issue number1
DOIs
StatePublished - Jul 2008
Externally publishedYes

Keywords

  • Glucagon-like peptide-1
  • Gustducin
  • Paracrine signaling
  • Serotonin
  • Sweet
  • Taste

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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