Abstract
The serotonin 5-HT2A and glutamate mGlu2 receptors continue to attract particular attention, given their implication in psychosis associated with schizophrenia and the mechanism of action of atypical antipsychotics and a new class of antipsychotics, respectively. A large body of evidence indicates a functional crosstalk between both receptors in the brain, but the underlying mechanisms are not entirely elucidated. Here, we have explored the influence of 5-HT2A receptor upon the phosphorylation pattern of mGlu2 receptor in light of the importance of specific phosphorylation events in regulating G protein-coupled receptor signaling and physiological outcomes. Among the five mGlu2 receptor-phosphorylated residues identified in HEK-293 cells, the phosphorylation of Ser843 was enhanced upon mGlu2 receptor stimulation by the orthosteric agonist LY379268 only in cells co-expressing the 5-HT2A receptor. Likewise, administration of LY379268 increased mGlu2 receptor phosphorylation at Ser843 in prefrontal cortex of wild-type mice but not 5-HT2A−/− mice. Exposure of HEK-293 cells co-expressing mGlu2 and 5-HT2A receptors to 5-HT also increased Ser843 phosphorylation state to a magnitude similar to that measured in LY379268-treated cells. In both HEK-293 cells and prefrontal cortex, Ser843 phosphorylation elicited by 5-HT2A receptor stimulation was prevented by the mGlu2 receptor antagonist LY341495, while the LY379268-induced effect was abolished by the 5-HT2A receptor antagonist M100907. Mutation of Ser843 into alanine strongly reduced Gi/o signaling elicited by mGlu2 or 5-HT2A receptor stimulation in cells co-expressing both receptors. Collectively, these findings identify mGlu2 receptor phosphorylation at Ser843 as a key molecular event that underlies the functional crosstalk between both receptors.
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Acknowledgements
This work was supported by grants from la Fondation pour la Recherche Médicale, ANR (Contract no. ANR-08-MNPS-0011), CNRS, INSERM, and University of Montpellier to P.M. and F.V. E.B. is supported by the LABEX Ion Channel Science and Therapeutics (ICST). Mass spectrometry experiments were carried out using facilities of the Functional Proteomic Platform of Montpellier Languedoc-Roussillon. S.M. was a recipient of a fellowship from the French Ministry for Research.
Author contributions:
S.M. performed biochemical and electrophysiology experiments, some LC-MS/MS analyses, and participated in manuscript writing. M.B. and J.C. performed some biochemical experiments and LC-MS/MS analyses. P.M. conceived the study, supervised experiments, and wrote the manuscript. F.V. conceived the study, performed LC-MS/MS analyses and some biochemical experiments, supervised experiments, and wrote the manuscript. J.B. conceived the study and participated in manuscript writing. E.B. supervised electrophysiology experiments. G.K. and E.K. extracted and purified FR900359 from Ardisia crenata plant. G.B. and F.N. participated in experiments on mGlu2−/− mice.
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Murat, S., Bigot, M., Chapron, J. et al. 5-HT2A receptor-dependent phosphorylation of mGlu2 receptor at Serine 843 promotes mGlu2 receptor-operated Gi/o signaling. Mol Psychiatry 24, 1610–1626 (2019). https://doi.org/10.1038/s41380-018-0069-6
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DOI: https://doi.org/10.1038/s41380-018-0069-6
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