B-HT 920-induced effects on rat feeding behaviour.

Wistar rats, deprived of food for 15 h, were injected with B-HT 920 and 20 min later presented with their normal diet in their individual home cages. The parameters considered were latency to feeding and food intake which was determined 0.5, 1, 2, 3, 6 and 24 h later. B-HT 920 significantly reduced latency to feeding at 0.1, 0.5 and 1 mg/kg; food intake was increased by doses of 0.05 and 0.1 mg/kg 3 and 6 h after treatment and decreased by a dose of 1 mg/kg at 3 h. The amount of food eaten over a 24 h period by the various groups did not differ. At this time rats received a second injection of the drug at the same dosages, and preweighed food was presented again 20 min later. We confirmed that latency to feeding is lowered by B-HT 920 at 0.1, 0.5 and 1 mg/kg, doses which also induced feeding in sated rats within the first half-hour and even after 1 h in the case of the highest dose. Since penile erection and stretching and yawning, signs typically induced by all DA D2 agonists, were observed after B-HT 920 at 0.05, 0.1 and 0.5 mg/kg, discussion centres on the possible mechanisms involved in the B-HT 920-induced effects.