Abstract
We measured the activity of the thiamine pyrophosphate-dependent enzyme alpha-ketoglutarate dehydrogenase complex in postmortem brain of 12 patients with the spinocerebellar ataxia type 1 form of olivopontocerebellar atrophy. alpha-Ketoglutarate dehydrogenase complex activity measured in the absence of thiamine pyrophosphate was markedly reduced (-72%) in olivopontocerebellar atrophy cerebellar cortex. Decreased activity of this key rate-limiting Krebs cycle enzyme could compromise cerebellar energy metabolism and excitatory amino acid synthesis and thereby contribute to the brain dysfunction of olivopontocerebellar atrophy.
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