The influence of restraint stress on potential aluminum (Al)-induced behavioral changes was assessed in CD-1 mice. Three groups of adult mice were given 0, 300 and 600 mg Al/kg body weight per day in drinking water for 2 weeks. One-half of the animals in each group were concurrently subjected to restraint stress during 1 h per day throughout the study. After cessation of treatment, open-field activity, active avoidance learning, and motor resistance and coordination of the animals were evaluated. At the end of the behavioral testing period, mice were killed and Al concentrations were determined in a number of tissues. There were no remarkable effects of Al, restraint stress or their combined administration on either open-field activity or on the number of avoidances in an automatic reflex conditioner. However, a lower motor resistance and coordination in a rotarod were observed following exposure to Al at 600 mg/kg/day, restraint alone or concurrent administration of Al (300 and 600 mg/kg/day) plus restraint stress. The levels of Al in whole brain and cerebellum were significantly enhanced in mice exposed to Al plus restraint. Although the present results scarcely show Al-induced neurobehavioral effects, the influence of restraint stress on Al levels in whole brain and cerebellum can be the basis for further studies on the potential role of this element in certain neurological disorders.

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