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Neuropharmacology. 2016 Sep;108:275-83. doi: 10.1016/j.neuropharm.2016.03.049. Epub 2016 Mar 30.

Dopamine dynamics and cocaine sensitivity differ between striosome and matrix compartments of the striatum.

Author information

1
The Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA 22030, USA; Laboratory for Integrative Neuroscience, Section on Synaptic Pharmacology, National Institute on Alcohol Abuse and Alcoholism, Rockville, MD 20852, USA.
2
Laboratory for Integrative Neuroscience, Section on Synaptic Pharmacology, National Institute on Alcohol Abuse and Alcoholism, Rockville, MD 20852, USA.
3
Laboratory for Integrative Neuroscience, Section on Synaptic Pharmacology, National Institute on Alcohol Abuse and Alcoholism, Rockville, MD 20852, USA. Electronic address: mateoy@mail.nih.gov.

Abstract

The striatum is typically classified according to its major output pathways, which consist of dopamine D1 and D2 receptor-expressing neurons. The striatum is also divided into striosome and matrix compartments, based on the differential expression of a number of proteins, including the mu opioid receptor, dopamine transporter (DAT), and Nr4a1 (nuclear receptor subfamily 4, group A, member 1). Numerous functional differences between the striosome and matrix compartments are implicated in dopamine-related neurological disorders including Parkinson's disease and addiction. Using Nr4a1-eGFP mice, we provide evidence that electrically evoked dopamine release differs between the striosome and matrix compartments in a regionally-distinct manner. We further demonstrate that this difference is not due to differences in inhibition of dopamine release by dopamine autoreceptors or nicotinic acetylcholine receptors. Furthermore, cocaine enhanced extracellular dopamine in striosomes to a greater degree than in the matrix and concomitantly inhibited dopamine uptake in the matrix to a greater degree than in striosomes. Importantly, these compartment differences in cocaine sensitivity were limited to the dorsal striatum. These findings demonstrate a level of exquisite microanatomical regulation of dopamine by the DAT in striosomes relative to the matrix.

KEYWORDS:

Dopamine D2 receptor; Dopamine transporter; Nucleus accumbens; Patch; Voltammetry

PMID:
27036891
PMCID:
PMC5026225
DOI:
10.1016/j.neuropharm.2016.03.049
[Indexed for MEDLINE]
Free PMC Article

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