Differential Regulation of the Dopamine D2and D3 Receptors by G Protein-coupled Receptor Kinases and β-Arrestins*

The D2 and D3receptors (D2R and D3R), which are potential targets for antipsychotic drugs, have a similar structural architecture and signaling pathway. Furthermore, in some brain regions they are expressed in the same cells, suggesting that differences between the two receptors might lie in other properties such as their regulation. In this study we investigated, using COS-7 and HEK-293 cells, the mechanism underlying the intracellular trafficking of the D2R and D3R. Activation of D2R caused G protein-coupled receptor kinase-dependent receptor phosphorylation, a robust translocation of β-arrestin to the cell membrane, and profound receptor internalization. The internalization of the D2R was dynamin-dependent, suggesting that a clathrin-coated endocytic pathway is involved. In addition, the D2R, upon agonist-mediated internalization, localized to intracellular compartments distinct from those utilized by the β2-adrenergic receptor. However, in the case of the D3R, only subtle agonist-mediated receptor phosphorylation, β-arrestin translocation to the plasma membrane, and receptor internalization were observed. Interchange of the second and third intracellular loops of the D2R and D3R reversed their phenotypes, implicating these regions in the regulatory properties of the two receptors. Our studies thus indicate that functional distinctions between the D2R and D3R may be found in their desensitization and cellular trafficking properties. The differences in their regulatory properties suggest that they have distinct physiological roles in the brain.

• Publication year

  2001

• Venue

  Journal of Biological Chemistry

• Publication date

  2001-10-05

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/JBC.M106728200PMID 11473130
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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