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Substance P: correlation of CSF and plasma levels
J W Clark1, P D Senanayake, G D Solomon
1Cleveland Clinic Foundation, OH 44195-5039.
Headache
|May 1, 1994
Summary
Cerebrospinal fluid (CSF) and plasma concentrations of substance P show a strong positive correlation. This finding simplifies substance P measurement for evaluating headache treatments.
Area of Science:
- Neuroscience
- Biochemistry
- Clinical Chemistry
Background:
- Substance P is a neuropeptide involved in pain transmission.
- Accurate measurement of Substance P is crucial for understanding neurological conditions and evaluating treatments.
- Current methods for Substance P measurement can be complex.
Purpose of the Study:
- To investigate the correlation between Substance P levels in cerebrospinal fluid (CSF) and plasma.
- To determine if plasma Substance P can serve as a reliable indicator for CSF Substance P.
Main Methods:
- 37 patients undergoing lumbar puncture provided paired CSF and plasma samples.
- Substance P was quantified using radioimmunoassay (RIA).
- Multiple measurements (at least 4 per sample) ensured assay accuracy.
Main Results:
- Mean plasma Substance P level was 1.195 (+/- 1.1).
- Mean CSF Substance P level was 1.075 (+/- 0.07).
- A statistically significant positive correlation was observed between plasma and CSF Substance P (Pearson's r = 0.656, P < .0001; Spearman's rho = 0.698, P < .0001).
Conclusions:
- Plasma Substance P levels closely correlate with CSF Substance P levels.
- This correlation suggests plasma measurement can simplify Substance P assessment.
- This may facilitate the evaluation of therapeutic agents, particularly for headache disorders.