An Akt/beta-arrestin 2/PP2A signaling complex mediates dopaminergic neurotransmission and behavior.

Journal Article (Journal Article)

Dopamine plays an important role in the etiology of schizophrenia, and D2 class dopamine receptors are the best-established target of antipsychotic drugs. Here we show that D2 class-receptor-mediated Akt regulation involves the formation of signaling complexes containing beta-arrestin 2, PP2A, and Akt. beta-arrestin 2 deficiency in mice results in reduction of dopamine-dependent behaviors, loss of Akt regulation by dopamine in the striatum, and disruption of the dopamine-dependent interaction of Akt with its negative regulator, protein phosphatase 2A. Importantly, canonical cAMP-mediated dopamine-receptor signaling is not inhibited in the absence of beta-arrestin 2. These results demonstrate that, apart from its classical function in receptor desensitization, beta-arrestin 2 also acts as a signaling intermediate through a kinase/phosphatase scaffold. Furthermore, this function of beta-arrestin 2 is important for the expression of dopamine-associated behaviors, thus implicating beta-arrestin 2 as a positive mediator of dopaminergic synaptic transmission and a potential pharmacological target for dopamine-related psychiatric disorders.

Full Text

Duke Authors

Cited Authors

  • Beaulieu, J-M; Sotnikova, TD; Marion, S; Lefkowitz, RJ; Gainetdinov, RR; Caron, MG

Published Date

  • July 29, 2005

Published In

Volume / Issue

  • 122 / 2

Start / End Page

  • 261 - 273

PubMed ID

  • 16051150

International Standard Serial Number (ISSN)

  • 0092-8674

Digital Object Identifier (DOI)

  • 10.1016/j.cell.2005.05.012


  • eng

Conference Location

  • United States