Abstract
Various postulated indices of central dopaminergic activity - cerebrospinal fluid (CSF) dopamine (DA), dihydroxy-phenylacetic acid (DOPAC), homovanillic acid (HVA), noradrenaline (NA), plasma NA, serum prolactin, serum dopamine-β-hydroxylase (DBH), and platelet monoamine oxidase (MAO) activity - were measured in 30 drug-free inpatients. The mean values and the ranges were similar to those described in the literature. Plasma NA showed significant positive correlation with age. Significant positive correlation was found between CSF DA and its metabolites DOPAC and HVA. Serum DBH activity showed a slight but significant inverse correlation with CSF DA and its two metabolites. CSF NA showed a significant positive correlation with CSF DOPAC, but only in females. Serum DBH activity had no significant correlation either with CSF or with plasma NA levels. These findings suggest that either CSF HVA or DOPAC and DA may be useful indicators of DA metabolism in humans. Serum DBH activity may be in relationship with the central dopaminergic functions.
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