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Preferential coupling between dopamine D2 receptors and G-proteins

J P Montmayeur1, J Guiramand, E Borrelli

  • 1Unité de Biologie Moléculaire et de Génie Génétique INSERM U184, Strasbourg, France.

Molecular Endocrinology (Baltimore, Md.)
|February 1, 1993
PubMed
Summary

The D2S dopamine receptor is more effective at inhibiting adenylyl cyclase than D2L. This difference is due to D2L

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • D2 dopamine receptors are G-protein-coupled receptors involved in cellular signaling.
  • Alternative splicing produces two D2 receptor variants, D2L and D2S, differing by a 29-amino acid insertion in the third intracellular domain.
  • This domain is crucial for G-protein coupling and differential adenylyl cyclase inhibition was previously observed.

Purpose of the Study:

  • To investigate the molecular basis for the differential inhibition of adenylyl cyclase activity by D2S and D2L receptors.
  • To identify the specific G-protein subtypes involved in mediating the distinct functions of D2L and D2S.

Main Methods:

  • Analysis of G-protein expression in JEG3 cells.
  • Cotransfection experiments involving D2L and D2S receptors with G alpha i subunits.
  • Functional assays measuring adenylyl cyclase activity.

Main Results:

  • JEG3 cells lack the G alpha i2 protein.
  • Cotransfection of D2L with G alpha i2 restored adenylyl cyclase inhibitory activity to levels similar to D2S.
  • In cell lines expressing all G alpha i subtypes, D2L and D2S showed similar activity.

Conclusions:

  • The 29-amino acid insertion in D2L enables specific interaction with the G alpha i2 protein.
  • Differential G-protein coupling, particularly with G alpha i2, underlies the distinct signaling efficiencies of D2 dopamine receptor variants.
  • In vivo, activated D2 receptors likely exert their functions through specific interactions with Gi-protein subtypes.

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