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. 1991 Mar 1;88(5):1859–1863. doi: 10.1073/pnas.88.5.1859

D1 and D2 dopamine receptor mRNA in rat brain.

D M Weiner 1, A I Levey 1, R K Sunahara 1, H B Niznik 1, B F O'Dowd 1, P Seeman 1, M R Brann 1
PMCID: PMC51125  PMID: 1825729

Abstract

Physiological and pharmacological criteria have divided dopamine receptors into D1 and D2 subtypes, and genes encoding these subtypes have recently been cloned. Based on the sequences of the cloned receptors, we prepared oligodeoxynucleotide probes to map the cellular expression of the corresponding mRNAs in rat brain by in situ hybridization histochemistry. These mRNAs showed largely overlapping yet distinct patterns of expression. The highest levels of expression for both mRNAs were observed in the caudate-putamen, nucleus accumbens, and olfactory tubercle. Within the caudate-putamen, 47 +/- 6% and 46 +/- 5% of the medium-sized neurons (10-15 microns) expressed the D1 and D2 mRNAs, respectively, and only the D2 mRNA was observed in the larger neurons (greater than 20 microns). The D1 and D2 mRNAs were expressed in most cortical regions, with the highest levels in the prefrontal and entorhinal cortices. Within neocortex, D1 mRNA was observed primarily in layer 6 and D2 mRNA in layers 4-5. Within the amygdala, D1 mRNA was observed in the intercalated nuclei, and D2 mRNA in the central nucleus. Within the hypothalamus, D1 mRNA was observed in the suprachiasmatic nucleus and D2 mRNA in many of the dopaminergic cell groups. Within the septum, globus pallidus, superior and inferior colliculi, mammillary bodies, and substantia nigra only D2 mRNA was detected. These data provide insight into the neuroanatomical basis of the differential effects of drugs that act on D1 or D2 receptors.

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Selected References

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