Effects of Acutely Applied Cannabinoid Cb1 Ligands on Nociception in Rats with a Model of Depression
نویسندگان
چکیده
The effects of CB1 receptor agonist HU-210 and cannabinoid CB1 receptor antagonist SR 141716A on nociception of male Wistar rats with a model of depression (bilateral olfactory bulbectomy, OBX) were studied. HU-210 (5 μg) and SR 141716A (3 μg) were acutely microinjected i.c.v. on the developed depression background. Nociception was examined as applied mechanical pressure on the left hind paw of the rat (analgesy-meter test, Randall & Sellitto). In the OBX rats, it was found that the pain threshold was increased. HU-210 significantly increased the pain threshold in OBX rats, i.e. decreased the pain sensitivity as compared to saline-treated OBX controls and to sham-operated controls, suggesting an implication of CB1 receptors in nociception of OBX rats. SR 141716A did not affect the nociception in OBX rats. These results suggest that stimulation of CB1 receptors in rats with a model of depression exerted antinociceptive effect.
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