Comparative development of D1-dopamine and mu opiate receptors in normal and in 6-hydroxydopamine-lesioned neonatal rat striatum: dopaminergic fibers regulate mu but not D1 receptor distribution

Brain Research. Developmental Brain Research
J CabocheM J Besson

Abstract

The postnatal development of D1 dopaminergic receptors (D1 receptors) was investigated in the rat striatum in relation to distribution of mu opiate receptor patches and islandic tyrosine hydroxylase (TH)-immunoreactive fibers. The possible influence of dopaminergic (DA) fibers originating from the substantia nigra on the postnatal distribution of striatal D1 and mu receptors was also examined by producing an early 6-hydroxydopamine (6-OHDA) lesion of DA fibers. D1 and mu receptors were labeled with selective ligands: [3H]SCH 23390 and [3H]DAGO, respectively. During the first postnatal week, control rats showed patches of dense D1 binding sites in the entire rostro-caudal extension of the striatum. The localization of D1 receptor patches corresponded to striosomes identified by TH-immunoreactive islands. The striatal distribution of mu receptors was relatively homogeneous at postnatal day 0 (P0) but was clearly patchy at P3-P4. During the second postnatal week the striosomal pattern of D1 binding sites disappeared along a dorso-ventral gradient whereas mu binding sites remained distributed in patches. Densitometric measurements showed that there was a parallel increase of D1 binding sites in both striosomes and the surrounding m...Continue Reading

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Related Concepts

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Establishment and Maintenance of Localization
Abnormal Degeneration
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SCH 23390
August Rats
Lentiform Nucleus Structure
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