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Dopamine D2 autoreceptors in rats are behaviorally functional at 21 but not 10 days of age

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Abstract

Previous studies used either racemic 3-(3-hydroxyphenyl)-N-n-propylpiperidine [(±)-3-PPP] or lower doses of the mixed dopamine (DA) D1/D2 agonist apomorphine (APO) to conclude that brain DA D2 autoreceptors are not behaviorally functional until 28 days of age. The purpose of this study was to provide behavioral evidence for functional D2 autoreceptors before 28 days of age using DA agonists with greater selectivity for D2 autoreceptors. The locomotor activity of 10-, 21-, 35-day-old and adult rats was monitored after injection of a D2 autoreceptor agonist. There were significant decreases in the locomotor activity of 21-, 35-day-old, and adult rats injected with (-)-3-PPP, SND 919, or PD 128483. Lower doses of APO significantly decreased the activity of adult and 35-day-old rats but not younger rats. The only significant effect on the locomotor activity of 10-day-old rats was an increase in activity after injection of APO, 0.01 mg/kg or higher, or B-HT 920, 0.01 mg/kg. The results suggest that brain DA D2 autoreceptors are behaviorally functional at 21, but not 10, days of age.

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  1. Division of Pharmacology, Department of Pharmacal Sciences, Auburn University School of Pharmacy, 36849-5503, Auburn, AL, USA

    Min-Ya Lin & Donald E. Walters

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  1. Min-Ya Lin
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  2. Donald E. Walters
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Lin, MY., Walters, D.E. Dopamine D2 autoreceptors in rats are behaviorally functional at 21 but not 10 days of age. Psychopharmacology 114, 262–268 (1994). https://doi.org/10.1007/BF02244847

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  • DOI: https://doi.org/10.1007/BF02244847

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