Abstract
Glutamic acid decar☐ylase (GAD) activity was measured in specific divisions of the deep cerebellar nuclei of rats with an inherited dystonia. In 16-day-old dystonic rats there was a significant increase in GAD activity only in the nucleus interpositus (+26%). In 20-day-old dystonic rats GAD activity in all 3 cerebellar nuclei (fastigial, interpositus, dentate) was significantly increased compared to normal controls. The results indicate a spread of the anatomical locus of the neurochemical abnormality with time. During this period (postnatal days 16–20) there is a progressive worsening of the motor disorder in the affected animals.
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