Concentration gradients for HVA, 5-HIAA, ascorbic acid, and uric acid in cerebrospinal fluid
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1Department of Neurology and Psychiatry, University of Debrecen Medical School, Hungary.
Insights
Lumbar cerebrospinal fluid (CSF) measures of homovanillic acid (HVA) are not reliable indicators of cisternal levels, unlike 5-hydroxyindoleacetic acid (5-HIAA). This impacts neurological and psychiatric research.
Area of Science:
- Neurochemistry
- Biomarker Analysis
- Cerebrospinal Fluid Dynamics
Background:
- Cerebrospinal fluid (CSF) metabolite concentrations vary regionally.
- Understanding these variations is crucial for interpreting biomarker data in neurological and psychiatric conditions.
Purpose of the Study:
- To compare concentrations of homovanillic acid (HVA), 5-hydroxyindoleacetic acid (5-HIAA), ascorbic acid, and uric acid in lumbar and cisternal CSF.
- To assess the reliability of lumbar CSF metabolite levels as predictors of cisternal concentrations.
Main Methods:
- Measurement of HVA, 5-HIAA, ascorbic acid, and uric acid in lumbar and cisternal CSF samples.
- Analysis of patient cohorts with psychiatric and neurological impairments.
- Statistical correlation analysis between metabolite concentrations in different CSF regions.
Main Results:
- Cisternal HVA and 5-HIAA concentrations were significantly higher than lumbar levels.
- Cisternal uric acid was lower than lumbar levels; ascorbic acid showed no significant difference.
- High correlation between lumbar and cisternal 5-HIAA and ascorbic acid, but lower for HVA and uric acid.
- Significant correlations between HVA-5-HIAA, 5-HIAA-ascorbic acid, and 5-HIAA-uric acid were observed in cisternal, but not lumbar, CSF.
Conclusions:
- Lumbar HVA measurements are unreliable for estimating cisternal concentrations.
- Lumbar 5-HIAA measurements may provide a reasonable estimate of cisternal levels.
- Regional differences in CSF metabolite concentrations necessitate careful interpretation of biomarker data.
Abstract:
Concentrations of HVA, 5-HIAA, ascorbic acid, and uric acid in the lumbar and cisternal cerebrospinal fluid (CSF) were measured in psychiatric and neurologically impaired patients. The concentration of HVA is 6.1 times and of 5-HIAA 2.7 times higher in cisternal than in lumbar samples, the cisternal level of uric acid is half that of the lumbar region, but no significant differences were found in ascorbic acid concentrations. Correlation between lumbar and cisternal metabolite concentrations is high for 5-HIAA and ascorbic acid, and is less for HVA and uric acid. In cisternal CSF there is a significant correlation between levels of HVA-5-HIAA, 5-HIAA-ascorbic acid, and 5-HIAA-uric acid. These correlations disappear in lumbar CSF. These findings indicate that extrapolations to cisternal neurotransmitter metabolite concentration from lumbar measures are unwarranted for HVA, but not for 5-HIAA.