A2A-D2 receptor–receptor interaction modulates gliotransmitter release from striatal astrocyte processes

Chiara Cervetto, Arianna Venturini, Mario Passalacqua, Diego Guidolin, Susanna Genedani, Kjell Fuxe, Dasiel O. Borroto-Esquela, Pietro Cortelli, Amina Woods, Guido Maura, Manuela Marcoli, Luigi F. Agnati

Research output: Contribution to journalArticle

Abstract

Evidence for striatal A2A-D2 heterodimers has led to a new perspective on molecular mechanisms involved in schizophrenia and Parkinson's disease. Despite the increasing recognition of astrocytes’ participation in neuropsychiatric disease vulnerability, involvement of striatal astrocytes in A2A and D2 receptor signal transmission has never been explored. Here, we investigated the presence of D2 and A2A receptors in isolated astrocyte processes prepared from adult rat striatum by confocal imaging; the effects of receptor activation were measured on the 4-aminopyridine-evoked release of glutamate from the processes. Confocal analysis showed that A2A and D2 receptors were co-expressed on the same astrocyte processes. Evidence for A2A-D2 receptor–receptor interactions was obtained by measuring the release of the gliotransmitter glutamate: D2 receptors inhibited the glutamate release, while activation of A2A receptors, per se ineffective, abolished the effect of D2 receptor activation. The synthetic D2 peptide VLRRRRKRVN corresponding to the receptor region involved in electrostatic interaction underlying A2A-D2 heteromerization abolished the ability of the A2A receptor to antagonize the D2 receptor-mediated effect. Together, the findings are consistent with heteromerization of native striatal astrocytic A2A-D2 receptors that via allosteric receptor–receptor interactions could play a role in the control of striatal glutamatergic transmission. These new findings suggest possible new pathogenic mechanisms and/or therapeutic approaches to neuropsychiatric disorders. (Figure presented.).

Original languageEnglish (US)
Pages (from-to)268-279
Number of pages12
JournalJournal of Neurochemistry
Volume140
Issue number2
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Keywords

  • astrocyte processes
  • glutamate
  • heterodimers
  • Receptor–receptor interactions

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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  • Cite this

    Cervetto, C., Venturini, A., Passalacqua, M., Guidolin, D., Genedani, S., Fuxe, K., Borroto-Esquela, D. O., Cortelli, P., Woods, A., Maura, G., Marcoli, M., & Agnati, L. F. (2017). A2A-D2 receptor–receptor interaction modulates gliotransmitter release from striatal astrocyte processes. Journal of Neurochemistry, 140(2), 268-279. https://doi.org/10.1111/jnc.13885