Abstract
The present study shows that intranigral injection of dicoumarol, a DT-diaphorase inhibitor, potentiates the neurotoxic effect of salsolinol (salsolinol 1.25 nmoles plus dicoumarol 2 nmoles; in 2 microl). Rats treated with dicoumarol plus salsolinol presented a characteristic contralateral rotational behaviour when they were stimulated with apomorphine (0.5 mg/kg, s.c.), similar to rats injected unilaterally with 6-hydroxydopamine (6-OHDA). These rats also exhibited impairment of motor and cognitive behaviours. The results support the hypothesis that DT-diaphorase plays a protective role in the nigrostriatal dopaminergic systems.
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