| First Author | Marcellino D | Year | 2008 |
| Journal | J Biol Chem | Volume | 283 |
| Issue | 38 | Pages | 26016-25 |
| PubMed ID | 18644790 | Mgi Jnum | J:141997 |
| Mgi Id | MGI:3820168 | Doi | 10.1074/jbc.M710349200 |
| Citation | Marcellino D, et al. (2008) Identification of dopamine D1-D3 receptor heteromers. Indications for a role of synergistic D1-D3 receptor interactions in the striatum. J Biol Chem 283(38):26016-25 |
| abstractText | The function of dopamine D(3) receptors present in the striatum has remained elusive. In the present study evidence is provided for the existence of dopamine D(1)-D(3) receptor heteromers and for an intramembrane D(1)-D(3) receptor cross-talk in living cells and in the striatum. The formation of D(1)-D(3) receptor heteromers was demonstrated by fluorescence resonance energy transfer and bioluminescence resonance energy transfer techniques in transfected mammalian cells. In membrane preparations from these cells, a synergistic D(1)-D(3) intramembrane receptor-receptor interaction was observed, by which D(3) receptor stimulation enhances D(1) receptor agonist affinity, indicating that the D(1)-D(3) intramembrane receptor-receptor interaction is a biochemical characteristic of the D(1)-D(3) receptor heteromer. The same biochemical characteristic was also observed in membrane preparations from brain striatum, demonstrating the striatal co-localization and heteromerization of D(1) and D(3) receptors. According to the synergistic D(1)-D(3) intramembrane receptor-receptor interaction, experiments in reserpinized mice showed that D(3) receptor stimulation potentiates D(1) receptor-mediated behavioral effects by a different mechanism than D(2) receptor stimulation. The present study shows that a main functional significance of the D(3) receptor is to obtain a stronger dopaminergic response in the striatal neurons that co-express the two receptors. |
