Cited by 86Neurotransmitter Receptor Influence on BehaviorReceptor Mechanisms and SignalingNeuroscience and Neuropharmacology Research

D2 dopamine receptor internalization prolongs the decrease of radioligand binding after amphetamine: a PET study in a receptor internalization-deficient mouse model

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Skinbjerg, Mette, Liow, Jeih-San, Seneca, Nicholas, Hong, Jinsoo, Lu, Shuiyu, Thorsell, Annika, Heilig, Markus, Pike, Victor W. +3 more·2010·NeuroImage

Abstract

Dopamine released by amphetamine decreases the in vivo binding of PET radioligands to the dopamine D(2) receptor. Although concentrations of extracellular dopamine largely return to baseline within 1 to 2 h after amphetamine treatment, radioligand binding remains decreased for several hours. The purpose of this study was to determine whether the prolonged decrease of radioligand binding after amphetamine administration is caused by receptor internalization. To distinguish dopamine displacement from receptor internalization, we used wild-type and arrestin3 (arr3) knockout mice, which are incapable of internalizing D(2) receptors. In addition, we used both the D(2) selective agonist [(11)C]MNPA (which is thought to bind to the high affinity state of the receptor) and the D(2) selective antagonist [(18)F]fallypride (which does not differentiate between high and low affinity state). After an initial baseline scan, animals were divided in three groups for a second scan: either 30 min or 4 h after amphetamine administration (3 mg/kg, i.p.) or as retest. At 30 min, [(11)C]MNPA showed greater displacement than [(18)F]fallypride, but each radioligand gave similar displacement in knockout and wild-type mice. At 4 h, the binding of both radioligands returned to baseline in arr3 knockout mice, but remained decreased in wild-type mice. Radioligand binding was unaltered on retest scanning. Our results suggest that the prolonged decrease of radioligand binding after amphetamine is mainly due to internalization of the D(2) receptor rather than dopamine displacement. In addition, this study demonstrates the utility of small animal PET to study receptor trafficking in vivo in genetically modified mice.

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  1. Bjurling P Reineck R Westerburg G Gee AD Sutcliffe J Långström B Link JM Ruth TJ 1995 Synthia, a compact radiochemistry system for automated production of radiopharmaceuticals Proceedings - Sixth Workshop on Targetry and Target Chemistry TRIUMF, Vancouver 282 284

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Authors
Skinbjerg, M., Liow, J.-S., Seneca, N., Hong, J., Lu, S., Thorsell, A., Heilig, M., Pike, V. W., Halldin, C., Sibley, D. R., & Innis, R. B.
Affiliations
  • National Institutes of Health (US)
  • National Institute on Alcohol Abuse and Alcoholism (US)
  • Karolinska Institutet (SE)
  • National Institute of Neurological Disorders and Stroke (US)
Corresponding author
Innis, Robert B.
Venue
NeuroImage
Publisher
Elsevier BV
Published
2010-05
Volume
50
Issue
4
Pages
1402-1407
ISSN
1053-8119 (ISSN-L)
OpenAlex
W2143378099
Cited by
86
References
36
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 7 · 2020: 2 · 2019: 3 · 2018: 6 · 2017: 5 · 2016: 3 · 2015: 6 · 2014: 9 · 2013: 5 · 2012: 11
FWCI
4.66
Type
journal article
Language
en
Open access
Locations
  • NeuroImage (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Intramural Program of NIMH (Z01-MH-002795-07, Z01-MH-002793)
  • NINDS (NS002263-33)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
dopamine D2 receptor, receptor internalization, amphetamine, dopamine release, radioligand binding, receptor trafficking, high-affinity state, small animal PET
MeSH terms
Amphetamine, Animals, Brain, Carbon Radioisotopes, Cell Membrane, Cerebellum, Corpus Striatum, Female, Fluorine Radioisotopes, Male, Naproxen, Time Factors, Dopamine Agents, Receptors, Dopamine D2, Mice, Knockout, Radiopharmaceuticals, Arrestins, Positron-Emission Tomography, Mice

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