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  • Title: Paradoxical kinesia in parkinsonism is not caused by dopamine release. Studies in an animal model.
    Author: Keefe KA, Salamone JD, Zigmond MJ, Stricker EM.
    Journal: Arch Neurol; 1989 Oct; 46(10):1070-5. PubMed ID: 2508609.
    Abstract:
    Rats become akinetic after large dopamine-depleting brain lesions, yet they show an activation-induced restoration of motor function. In this study, rats were given intraventricular injections of the neurotoxin 6-hydroxydopamine to permanently reduce the dopamine content of the corpus striatum by 98%. Although the rats were akinetic in their home cages, they swam effectively when placed in deep water and escaped from a shallow floating ice bath. These behaviors were not abolished by pretreating the animals with the dopamine antagonists haloperidol and SCH-23390. In contrast, haloperidol completely blocked the brain-damaged animals' behavioral responses to amphetamine. These results suggest that the paradoxical kinesia of dopamine-depleted rats is not a consequence of dopamine release from residual dopaminergic fibers.
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