Abstract
The author s found 6.5-fold reduced nerve growth factor (NGF) levels in the plasma of treated patients with Parkinson disease (PD) compared with healthy control subjects (P = 0.03). A significant positive correlation between levodopa and NGF plasma levels appeared after acute levodopa/benserazide administration. The data suggest that acute levodopa administration may contribute to an increase of NGF plasma concentrations, which are reduced in treated PD patients due to the ongoing disease process itself or chronic antiparkinsonian drug treatment.
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