Inhibition of cannabinoid CB1 receptor attenuates behavioural sensitization to methamphetamine in mice
| Authors | |
|---|---|
| Year of publication | 2003 |
| Type | Article in Periodical |
| Magazine / Source | European Neuropsychopharmacology |
| MU Faculty or unit | |
| Citation | |
| Field | Pharmacology and pharmaceutical chemistry |
| Keywords | AM 251; behavioral sensitization; locomotor/exploratory activity; mice |
| Description | Behavioural sensitization is typically manifested by increased behavioural responses to the drug. In our previous studies we created an original dosage regimen that produced sensitization to methamphetamine effects on locomotor/exploratory behaviour in mice and also cross-sensitization to methamphetamine with the cannabinoid receptor agonist methanandamide. The changes in the behaviour were recorded in the open field of the Actitrack apparatus (Panlab, S. L., Spain). Methamphetamine and combined methamphetamine+AM 251 treatments were injected to the mice at the doses of 2.5 mg/kg and 5 mg/kg, respectively. On the day 8 all mice were given a "challenge dose" of methamphetamine 2.5 mg/kg to check a development of hypothesised sensitization. In the group pre-treated with methamphetamine only, a significant behavioural sensitization occurred, whereas in the group pre-treated with the combination of methamphetamine and selective CB1 receptor antagonist AM 251 behavioural responses were significantly lower compared to methamphetamine sensitized animals. |
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