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Regulator of G-protein signaling-21 (RGS21) is an inhibitor of bitter gustatory signaling found in lingual and airway epithelia.

Publication ,  Journal Article
Cohen, SP; Buckley, BK; Kosloff, M; Garland, AL; Bosch, DE; Cheng, G; Radhakrishna, H; Brown, MD; Willard, FS; Arshavsky, VY; Tarran, R ...
Published in: J Biol Chem
December 7, 2012

The gustatory system detects tastants and transmits signals to the brain regarding ingested substances and nutrients. Although tastant receptors and taste signaling pathways have been identified, little is known about their regulation. Because bitter, sweet, and umami taste receptors are G protein-coupled receptors (GPCRs), we hypothesized that regulators of G protein signaling (RGS) proteins may be involved. The recent cloning of RGS21 from taste bud cells has implicated this protein in the regulation of taste signaling; however, the exact role of RGS21 has not been precisely defined. Here, we sought to determine the role of RGS21 in tastant responsiveness. Biochemical analyses confirmed in silico predictions that RGS21 acts as a GTPase-accelerating protein (GAP) for multiple G protein α subunits, including adenylyl cyclase-inhibitory (Gα(i)) subunits and those thought to be involved in tastant signal transduction. Using a combination of in situ hybridization, RT-PCR, immunohistochemistry, and immunofluorescence, we demonstrate that RGS21 is not only endogenously expressed in mouse taste buds but also in lung airway epithelial cells, which have previously been shown to express components of the taste signaling cascade. Furthermore, as shown by reverse transcription-PCR, the immortalized human airway cell line 16HBE was found to express transcripts for tastant receptors, RGS21, and downstream taste signaling components. Over- and underexpression of RGS21 in 16HBE cells confirmed that RGS21 acts to oppose bitter tastant signaling to cAMP and calcium second messenger changes. Our data collectively suggests that RGS21 modulates bitter taste signal transduction.

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Published In

J Biol Chem

DOI

EISSN

1083-351X

Publication Date

December 7, 2012

Volume

287

Issue

50

Start / End Page

41706 / 41719

Location

United States

Related Subject Headings

  • Taste Buds
  • Taste
  • Reverse Transcriptase Polymerase Chain Reaction
  • Respiratory Mucosa
  • RGS Proteins
  • Mice, Transgenic
  • Mice
  • Humans
  • GTP-Binding Protein Regulators
  • Cyclic AMP
 

Citation

APA
Chicago
ICMJE
MLA
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Cohen, S. P., Buckley, B. K., Kosloff, M., Garland, A. L., Bosch, D. E., Cheng, G., … Kimple, A. J. (2012). Regulator of G-protein signaling-21 (RGS21) is an inhibitor of bitter gustatory signaling found in lingual and airway epithelia. The Journal of Biological Chemistry, 287(50), 41706–41719. https://doi.org/10.1074/jbc.m112.423806
Cohen, Staci P., Brian K. Buckley, Mickey Kosloff, Alaina L. Garland, Dustin E. Bosch, Gang Cheng, Harish Radhakrishna, et al. “Regulator of G-protein signaling-21 (RGS21) is an inhibitor of bitter gustatory signaling found in lingual and airway epithelia.The Journal of Biological Chemistry 287, no. 50 (December 2012): 41706–19. https://doi.org/10.1074/jbc.m112.423806.
Cohen SP, Buckley BK, Kosloff M, Garland AL, Bosch DE, Cheng G, et al. Regulator of G-protein signaling-21 (RGS21) is an inhibitor of bitter gustatory signaling found in lingual and airway epithelia. The Journal of biological chemistry. 2012 Dec;287(50):41706–19.
Cohen, Staci P., et al. “Regulator of G-protein signaling-21 (RGS21) is an inhibitor of bitter gustatory signaling found in lingual and airway epithelia.The Journal of Biological Chemistry, vol. 287, no. 50, Dec. 2012, pp. 41706–19. Epmc, doi:10.1074/jbc.m112.423806.
Cohen SP, Buckley BK, Kosloff M, Garland AL, Bosch DE, Cheng G, Radhakrishna H, Brown MD, Willard FS, Arshavsky VY, Tarran R, Siderovski DP, Kimple AJ. Regulator of G-protein signaling-21 (RGS21) is an inhibitor of bitter gustatory signaling found in lingual and airway epithelia. The Journal of biological chemistry. 2012 Dec;287(50):41706–41719.

Published In

J Biol Chem

DOI

EISSN

1083-351X

Publication Date

December 7, 2012

Volume

287

Issue

50

Start / End Page

41706 / 41719

Location

United States

Related Subject Headings

  • Taste Buds
  • Taste
  • Reverse Transcriptase Polymerase Chain Reaction
  • Respiratory Mucosa
  • RGS Proteins
  • Mice, Transgenic
  • Mice
  • Humans
  • GTP-Binding Protein Regulators
  • Cyclic AMP