Abstract
Alterations induced by social isolation (1 day to 18 weeks) in low- and high-active mice (LAM and HAM) were studied in respect to locomotor activity, [3H]-spiperone binding in the striatum, striatal, and cortical dopamine metabolism, and presynaptic dopaminergic sensitivity to apomorphine (0.75 mg/kg; i.p.). Isolated HAM and LAM showed increased locomotor activity compared to group-housed mice after long-term isolation (6-18 weeks). Considering the studied dopaminergic parameters, it has been found that social isolation did not affect striatal D2 receptors, striatal and cortical dopamine metabolism, and apomorphine-mediated reduction of dopaminergic metabolism. The change of housing conditions was generally associated with an increase of cortical dopamine metabolism after 1 week. Activity type specific differences in group-housed LAM and HAM were found in the basal striatal dopamine metabolism and in the sensitivity of the nigrostriatal system to autoreceptor activation. The reduced striatal dopamine metabolism and the higher presynaptic sensitivity of HAM may be related to their high active running wheel behavior.
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