• J Neural Transm · Nov 2013

    Involvement of cannabinoid CB1 receptors in the antinociceptive effect of dipyrone.

    • Pinar Elmas and Ahmet Ulugol.
    • Department of Medical Pharmacology, Faculty of Medicine, Trakya University, 22030, Edirne, Turkey.
    • J Neural Transm. 2013 Nov 1; 120 (11): 1533-8.

    AbstractCannabinoid CB1 receptors have been implicated in the antinociceptive effect of paracetamol. In the current study, we examined whether blockade of CB1 receptors prevent the analgesic activity of dipyrone, in a similar way to paracetamol. Hot-plate and tail-flick tests were used to assess the antinociceptive activity in mice. Dipyrone and WIN 55,212-2, a cannabinoid agonist, exerted significant antinociceptive effects in both hot-plate and tail flick tests. The CB1 receptor antagonist, AM-251 (3 mg/kg), at a dose which had no effect when used alone, did not alter the antinociceptive effect of dipyrone, whereas completely prevented the antinociceptive activity of WIN 55,212-2 in both thermal antinociceptive tests. Our findings suggest that, unlike paracetamol, cannabinoid CB1 receptors do not participate in the antinociceptive action of dipyrone when acute pain tests used.

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