Abstract

[ 3H]spiroperidol binding has been measured in lymphocytes from patients with Parkinson's disease and age matched healthy volunteers. A dramatic decrease (73%) in the number of binding sites ( Bmax) without any variation of the affinity ( KD) has been observed in Parkinsonian patients. This decrease in Bmax is linearly correlated with the degree of disability of the Parkinsonian patients (r = 0.891, p <0.001). This decrease appeared to be relatively selective since no variation was observed with patients suffering of other neurological disorders (vascular hemiplegia, Alzeihmer's disease, olivopontocerebellar degeneration, Huntington's chorea).

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