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Solid-phase immunofluorometric assay for quantification of CSF immunoglobulins. Determination of normal reference
T Takeoka1, Y Shinohara, K Mori
1Department of Neurology, Tokai University School of Medicine, Kanagawaken, Japan.
Journal of the Neurological Sciences
|May 1, 1990
Summary
A new solid-phase immunofluorometric assay accurately quantifies immunoglobulin (Ig) levels in cerebrospinal fluid (CSF). This method is rapid, reproducible, and provides normal CSF Ig values comparable to enzyme immunoassay.
Area of Science:
- Clinical Chemistry
- Immunology
- Neuroscience
Background:
- Quantifying low immunoglobulin (Ig) concentrations in cerebrospinal fluid (CSF) requires highly sensitive methods.
- Existing enzyme immunoassays (EIA) for CSF IgG, IgA, and IgM have drawbacks, including enzyme inhibition and substrate requirements.
Purpose of the Study:
- To evaluate a solid-phase immunofluorometric assay for quantifying nanogram-range CSF IgG, IgA, and IgM.
- To establish normal values for CSF IgG, IgA, and IgM using this new assay.
Main Methods:
- Solid-phase immunofluorometric assay was employed for CSF Ig quantification.
- Normal CSF samples from 22 tension headache subjects were analyzed.
- CSF albumin levels and CSF/serum ratios were also assessed.
Main Results:
- The assay proved rapid and reproducible.
- Normal mean CSF values were established: IgG (23.9 µg/ml), IgA (2.00 µg/ml), and IgM (197 ng/ml).
- CSF albumin correlated with IgG and IgA, but not IgM, suggesting serum influence on CSF Ig levels.
Conclusions:
- The solid-phase immunofluorometric assay is a viable alternative for CSF Ig quantification.
- Normal CSF Ig levels appear influenced by serum Ig levels and molecular characteristics.
- Further research is needed to fully understand the dynamics of Ig transport into CSF.