Amino acids in plasma and CSF and monoamine metabolites in CSF: interrelationship in healthy subjects.
Plasma and cerebrospinal fluid (CSF) concentrations of amino acids were measured in 65 healthy volunteers (50 men and 15 women). The CSF levels of the monoamine metabolites homovanillic acid (HVA), 3-methoxy-4-hydroxyphenylethylene glycol (MOPEG), and 5-hydroxyindoleacetic acid (5-HIAA) were also determined. Sex differences were observed in both plasma and CSF amino acid levels as well as in the relationship between these concentrations. No significant correlations were observed between the CSF levels of HVA and 5-HIAA, and the concentrations of their precursor amino acids in either plasma or CSF. The MOPEG level in CSF correlated positively with the plasma concentrations of several amino acids.
D000328:Adult; D000596:Amino Acids / Q000097:blood / Q000134:cerebrospinal fluid*; D005260:Female; D006018:Glycols / Q000134:cerebrospinal fluid*; D006719:Homovanillic Acid / Q000134:cerebrospinal fluid*; D006801:Humans; D006897:Hydroxyindoleacetic Acid / Q000134:cerebrospinal fluid*; D008297:Male; D008734:Methoxyhydroxyphenylglycol / Q000134:cerebrospinal fluid*; D008875:Middle Aged; D010648:Phenylacetates / Q000134:cerebrospinal fluid*; D012016:Reference Values; D012737:Sex Factors
D000596:Amino Acids; D006018:Glycols; D010648:Phenylacetates; D008734:Methoxyhydroxyphenylglycol; D006897:Hydroxyindoleacetic Acid; D006719:Homovanillic Acid