Abstract
The present study examined effects of diazepam (DZP) alone or in combination with delta 9-tetrahydrocannabinol (THC) on feeding behavior as well as body weight in male ddY strain mice at 5 weeks of age. Because we saw no hyperphagic effect of DZP with or without THC in mice, we explored the hyperphagia elicitable by DZP. THC [2 (THC2) or 4 (THC4) mg/kg/day s.c.] was given daily for 7 days. For the last day the mice were starved and injected i.p. with DZP (2 mg/kg) 10 min prior to a food or maze test. Controls received vehicle injections. Feeding behavior was measured after giving food for 2 hr. THC4 significantly reduced body weight gain. DZP, with or without THC, induced hyperphagia. THC4 alone also induced hyperphagia that was not significantly affected by DZP. Time taken to find food was extended by DZP and further with THC. Both DZP and THC can therefore interact on food ingestion but synergize on food seeking in mice through different mechanisms.
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