Role of dopamine D-1 and D-2 receptor subtypes in mediating dopamine agonist effects on food consumption in rats

M. T. Martin-Iverson, C. T. Dourish

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

The effects of selective D-2 and D-1 dopamine (DA) receptor agonists on food consumption were investigated in free-feeding rats. A selective D-2 receptor agonist, (+)-4-propyl-9-hydroxynaphthoxazine (PHNO), increased the consumption of standard food pellets in the dose range of 7.5-120 μg/kg, while SKF 38393 (5.0 mg/kg), a selective D-1 receptor agonist, decreased food pellet intake. The increase in food pellet intake produced by PHNO was blocked by haloperidol (an antagonist relatively selective for the D-2 receptor at the dose used, 0.05 mg/kg) and SCH 23390 (20 μg/kg, a D-1 receptor selective antagonist). Increasing "arousal" by disturbance associated with repeated food weighting also increased food pellet consumption, but did not diminish PHNO-elecited feeding. However, the same range of doses of PHNO (7.5-120 μg/kg) which increased food pellet intake decreased consumption of a liquid diet, and had no overall effect on a highly palatable liquid diet. The increase in consumption of solid food induced by PHNO appears to be secondary to enhancement of chewing behaviors. In contrast, the decrease in food intake induced by SKF 39393 may be due to a direct action of the drug on neural feeding mechanisms.

Original languageEnglish
Pages (from-to)370-374
Number of pages5
JournalPsychopharmacology
Volume96
Issue number3
DOIs
Publication statusPublished - 1 Nov 1988
Externally publishedYes

Fingerprint

Dive into the research topics of 'Role of dopamine D-1 and D-2 receptor subtypes in mediating dopamine agonist effects on food consumption in rats'. Together they form a unique fingerprint.

Cite this