Abstract
Pretreatment of B6AF1/J mice with d-amphetamine HCl 10 mg/kg, twice daily for 5 days, produced a 4-fold increase in the running response to a test dose of 5 mg/kg amphetamine. Amphetamine pretreatment decreased whole-brain norepinephrine levels to 50% of control values and whole-brain dopamine to 85%. The test dose of 5 mg/kg amphetamine lowered whole brain norepinephrine levels of control mice from 0.50 μg/g to 0.28 μg/g in 2 h. In amphetamine-pretreated mice, this injection caused an increase in whole-brain norepinephrine levels from 0.22 μg/g to 0.55 μg/g at 30 min, followed by a decrease to 0.22 μg/g at 60 min. No change in whole brain dopamine levels was observed in either group. Amphetamine sensitization and norepinephrine depletion were still evident 25 days after pretreatment. No cross sensitization to morphine or cocaine was observed. Reserpine pretreatment resulted in a 3-fold increase in locomotor activity following injection of d-amphetamine, 5 mg/kg. No sensitization or changes in catecholamine levels were observed in amphetamine-treated A/J mice. These results suggest that the sensitization produced by amphetamine pretreatment may be related to the depletion of brain norepinephrine.
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Short, P.H., Shuster, L. Changes in brain norepinephrine associated with sensitization to d-amphetamine. Psychopharmacology 48, 59–67 (1976). https://doi.org/10.1007/BF00423307
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DOI: https://doi.org/10.1007/BF00423307