RGD Reference Report - Reduced striatal dopamine D1-D2 receptor heteromer expression and behavioural subsensitivity in juvenile rats. - Rat Genome Database

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Reduced striatal dopamine D1-D2 receptor heteromer expression and behavioural subsensitivity in juvenile rats.

Authors: Perreault, ML  Hasbi, A  Alijaniaram, M  O'Dowd, BF  George, SR 
Citation: Perreault ML, etal., Neuroscience. 2012 Dec 6;225:130-9. doi: 10.1016/j.neuroscience.2012.08.042. Epub 2012 Sep 15.
RGD ID: 6907442
Pubmed: PMID:22986162   (View Abstract at PubMed)
PMCID: PMC3479309   (View Article at PubMed Central)
DOI: DOI:10.1016/j.neuroscience.2012.08.042   (Journal Full-text)

In adult rat striatum the dopamine D1-D2 receptor heteromer is expressed selectively in a subset of medium spiny neurons (MSNs) that coexpress the dopamine D1 and D2 receptors (D1R and D2R) as well as dynorphin (DYN) and enkephalin (ENK), with higher coexpression in nucleus accumbens (NAc) and much lower in the caudate putamen (CP). In the present study we showed that in neonatal striatal cultured neurons >90% exhibited the D1R/D2R-DYN/ENK phenotype. Similarly, in the striatum of juvenile rats (age 26-28days) coexpression of D1R and D2R was also coincident with the expression of both DYN and ENK. Quantification of the number of striatal MSNs exhibiting coexpression of D1R and D2R in juvenile rats revealed significantly lower coexpression in NAc shell, but not core, and CP than in adult rats. However, within MSNs that coexpressed D1R and D2R, the propensity to form the D1-D2 receptor heteromer did not differ between age groups. Consistent with reduced coexpression of the D1R and D2R, juvenile rats exhibited subsensitivity to D1-D2 receptor heteromer-induced grooming following activation by SKF 83959. Given the proposed role of D1R/D2R-coexpressing MSNs in the regulation of thalamic output, and the recent discovery that these MSNs exhibit both inhibitory and excitatory capabilities, these findings suggest that the functional regulation of neurotransmission by the dopamine D1-D2 receptor heteromer within the juvenile striatum may be significantly different than in the adult.

Gene Ontology Annotations    Click to see Annotation Detail View

Molecular Function
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
protein-containing complex binding  IPIDrd2 (Rattus norvegicus)6907442heterodimerizationRGD 
protein-containing complex binding  IPIDrd1 (Rattus norvegicus)6907442heterodimerizationRGD 

Objects Annotated

Genes (Rattus norvegicus)
Drd1  (dopamine receptor D1)
Drd2  (dopamine receptor D2)


Additional Information