Abstract
In a social behavior test in mice ethanol (2 g/kg) significantly reduces the time spent in social interaction and increases locomotor activity. The relatively selective alpha 2-adrenoceptor antagonists atipamezole and idazoxan alone have no significant effect on either social interaction or locomotor activity in this test. However, when coadministered with 2 g/kg ethanol, atipamezole (0.3–3.0 mg/kg) significantly attenuated the ethanol-induced reduction in the time spent in social interaction without any effect on ethanol's locomotor stimulant action. Idazoxan (0.3–1.0 mg/kg) also showed a trend towards reversing the reduction in the time spent in social interaction although this was accompanied by a significant attenuation of the locomotor stimulant effect of ethanol. The results indicate that alpha 2-adrenoceptors may modulate ethanol's effects on social interaction in mice.
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