Format

Send to

Choose Destination
Sci Rep. 2017 Jun 29;7(1):4379. doi: 10.1038/s41598-017-04728-z.

Desensitized D2 autoreceptors are resistant to trafficking.

Author information

1
The Vollum Institute, Oregon Health and Science University, 3181S.W. Sam Jackson Pk. Rd., Portland, OR, 97239, USA.
2
Howard Hughes Medical Institute, Janelia Research Campus, 19700 Helix Dr., Ashburn, VA, 20147, USA.
3
Research Service, VA Portland Health Care System; and Department of Behavioral Neuroscience, Oregon Health and Science University, 3181S.W. Sam Jackson Pk. Rd., Portland, OR, 97239, USA.
4
The Vollum Institute, Oregon Health and Science University, 3181S.W. Sam Jackson Pk. Rd., Portland, OR, 97239, USA. williamj@ohsu.edu.

Abstract

Dendritic release of dopamine activates dopamine D2 autoreceptors, which are inhibitory G protein-coupled receptors (GPCRs), to decrease the excitability of dopamine neurons. This study used tagged D2 receptors to identify the localization and distribution of these receptors in living midbrain dopamine neurons. GFP-tagged D2 receptors were found to be unevenly clustered on the soma and dendrites of dopamine neurons within the substantia nigra pars compacta (SNc). Physiological signaling and desensitization of the tagged receptors were not different from wild type receptors. Unexpectedly, upon desensitization the tagged D2 receptors were not internalized. When tagged D2 receptors were expressed in locus coeruleus neurons, a desensitizing protocol induced significant internalization. Likewise, when tagged µ-opioid receptors were expressed in dopamine neurons they too were internalized. The distribution and lack of agonist-induced internalization of D2 receptors on dopamine neurons indicate a purposefully regulated localization of these receptors.

PMID:
28663556
PMCID:
PMC5491503
DOI:
10.1038/s41598-017-04728-z
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center