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Differential antagonism of the effects of dopamine D1-receptor agonists on feeding behavior in the rat

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Abstract

A series of experiments was conducted to examine the effects of dopamine D1 receptor agonists on food intake in rats. In the first experiment, the D1 agonist SKF 38393 (3.0–30.0 mg/kg) dose-dependently suppressed feeding during a 40 min food-access period, both in food-deprived rats and in non-deprived rats fed a highly palatable diet. Non-deprived rats were more sensitive to these effects of SKF 38393. Using the limited-access, food-deprivation procedure, a comparison was made between the anorectic effects of three D1 agonists with differing intrinsic efficacies and receptor selectivities. Rank order of potencies for reducing food intake was SKF 82958 > SKF 77434 > SKF 38393 (ED50 values: 0.7, 3.6 and 15.7 mg/kg, respectively). Dose-related, surmountable antagonism by the D1 antagonist SCH 23390 (0.01 and 0.03 mg/kg) was only obtained with SKF 82958 (0.1–10.0 mg/kg). In contrast to the other compounds, the effects of SKF 38393 were not appreciably altered by the D1 antagonist. The effects of SKF 82958 were also antagonized by the D2 receptor antagonist spiperone (0.05 and 0.1 mg/kg), although not in a dose-dependent manner. The present results support a role for D1 receptors in central feeding mechanisms. They also suggest that the effects of SKF 38393 on feeding may not be mediated exclusively by the D1 receptor and, further, that SKF 38393 may not serve well in behavioral studies as a prototypical D1 agonist. The results also demonstrate the need for comparisons among several compounds in studies of D1 mediated behavioral effects.

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  1. Psychobiology Section, NIDA Addiction Research Center, P.O. Box 5180, 21224, Baltimore, MD, USA

    Philip Terry & Jonathan L. Katz

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  1. Philip Terry
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Terry, P., Katz, J.L. Differential antagonism of the effects of dopamine D1-receptor agonists on feeding behavior in the rat. Psychopharmacology 109, 403–409 (1992). https://doi.org/10.1007/BF02247715

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