We sought to determine whether the motor dysfunctions and neuroleptic sensitivity that can occur in patients with AIDS relates to a deficit of striatal dopamine innervation similar to that of Parkinson's disease. For this purpose we measured concentrations of dopamine and its major metabolite homovanillic acid (HVA) in caudate nucleus tissue taken post-mortem from patients with AIDS and from appropriate age-matched control subjects. Dopamine and HVA concentrations were both significantly reduced in the AIDS group, with 20 of 34 patients exhibiting dopamine concentrations below the control range. This finding is consistent with a loss of nigrostriatal dopaminergic neurones, and may underlie the motor dysfunction and neuroleptic sensitivity that can occur in AIDS patients, indicating the potential value of antiparkinsonian therapy in such patients.
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