Expression of Dopamine D2 Receptor and Choline Acetyltransferase MRNA in the Dopamine Deafferented Rat Caudate-putamen

Overview

Journal Exp Brain Res

Specialty Neurology

Date 1990 Jan 1

PMID 2150048

Citations 6

Authors

S Brene

N Lindefors

M Herrera-Marschitz

H Persson

Affiliations

Soon will be listed here.

Abstract

In situ hybridization was used to study dopamine D2 receptor (D2R) and choline acetyltransferase (ChAT) mRNA expression in neurons of the rat forebrain, both on control animals and after a unilateral 6-hydroxydopamine (6-OHDA) lesion of midbrain dopamine neurons. D2R mRNA expressing neurons were seen in regions which are known to be heavily innervated by midbrain dopamine fibers such as caudate-putamen, nucleus accumbens and olfactory tubercle. ChAT mRNA expressing neurons were seen in caudate-putamen, nucleus accumbens and septal regions including vertical limb of the diagonal band. In caudate-putamen, approximately 55% of the medium sized neurons, which is the predominating neuronal cell-size in this region, were specifically labeled with the D2R probe. In addition, approximately 95% of the large size neurons in caudate-putamen were specifically labeled with both the D2R and ChAT probes, suggesting that most cholinergic neurons in the caudate-putamen express D2R mRNA. After a unilateral lesion of midbrain dopamine neurons, no change in the level of either D2R or ChAT mRNA were seen in the large size intrinsic cholinergic neurons in caudate-putamen. Similarly, no evidence was obtained for altered levels of D2R mRNA in medium size neurons in medial caudate-putamen, or nucleus accumbens. However, an increase in the number of medium size neurons expressing D2R mRNA was observed in the lateral part of the dopamine deafferented caudate-putamen. Thus, it appears that midbrain dopamine deafferentation causes an increase in D2R mRNA expression in a subpopulation of medium size neurons in the lateral caudate-putamen.

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