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Interclass GPCR Heteromerization Affects Localization and Trafficking

Abstract

Membrane trafficking processes regulate G protein-coupled receptor (GPCR) activity. Although class A GPCRs are capable of activating G proteins in a monomeric form, they can also potentially assemble into functional GPCR heteromers. Here, we showed that the class A serotonin 5-HT receptors (5-HTRs) affected the localization and trafficking of class C metabotropic glutamate receptor 2 (mGluR2) through a mechanism that required their assembly as heteromers in mammalian cells. In the absence of agonists, 5-HTR was primarily localized within intracellular compartments, and coexpression of 5-HTR with mGluR2 increased the intracellular distribution of the otherwise plasma membrane-localized mGluR2. Agonists for either 5-HTR or mGluR2 differentially affected trafficking through Rab5-positive endosomes in cells expressing each component of the 5-HTR-mGluR2 heterocomplex alone, or together. In addition, overnight pharmacological 5-HTR blockade with clozapine, but not with M100907, decreased mGluR2 density through a mechanism that involved heteromerization between 5-HTR and mGluR2. Using TAT-tagged peptides and chimeric constructs that are unable to form the interclass 5-HTR-mGluR2 complex, we demonstrated that heteromerization was necessary for the 5-HTR-dependent effects on mGluR2 subcellular distribution. The expression of 5-HTR also augmented intracellular localization of mGluR2 in mouse frontal cortex pyramidal neurons. Together, our data suggest that GPCR heteromerization may itself represent a mechanism of receptor trafficking and sorting.

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References
1.
Sorkin A, Von Zastrow M . Endocytosis and signalling: intertwining molecular networks. Nat Rev Mol Cell Biol. 2009; 10(9):609-22. PMC: 2895425. DOI: 10.1038/nrm2748. View

2.
Kotowski S, Hopf F, Seif T, Bonci A, Von Zastrow M . Endocytosis promotes rapid dopaminergic signaling. Neuron. 2011; 71(2):278-90. PMC: 3417347. DOI: 10.1016/j.neuron.2011.05.036. View

3.
Hamor P, Sirova J, Palenicek T, Zaniewska M, Bubenikova-Valesova V, Schwendt M . Chronic methamphetamine self-administration dysregulates 5-HT2A and mGlu2 receptor expression in the rat prefrontal and perirhinal cortex: Comparison to chronic phencyclidine and MK-801. Pharmacol Biochem Behav. 2018; 175:89-100. PMC: 6756482. DOI: 10.1016/j.pbb.2018.09.007. View

4.
Jakab R, Goldman-Rakic P . 5-Hydroxytryptamine2A serotonin receptors in the primate cerebral cortex: possible site of action of hallucinogenic and antipsychotic drugs in pyramidal cell apical dendrites. Proc Natl Acad Sci U S A. 1998; 95(2):735-40. PMC: 18490. DOI: 10.1073/pnas.95.2.735. View

5.
Ferre S, Casado V, Devi L, Filizola M, Jockers R, Lohse M . G protein-coupled receptor oligomerization revisited: functional and pharmacological perspectives. Pharmacol Rev. 2014; 66(2):413-34. PMC: 3973609. DOI: 10.1124/pr.113.008052. View