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Soluble interleukin-6 receptor levels in pleural effusions
A Yokoyama1, N Kohno, S Fujino
1Second Department of Internal Medicine, Ehime University School of Medicine, Japan.
Respiratory Medicine
|July 1, 1996
Summary
Soluble interleukin-6 receptor (sIL-6R) levels in pleural effusions do not significantly differ between various pleural diseases. Pleural sIL-6R is not a reliable biomarker for diagnosing pleural conditions or inducing acute-phase proteins.
Area of Science:
- Immunology
- Pulmonology
- Biochemistry
Background:
- Soluble cytokine receptors are common, with some having clinical relevance.
- Soluble interleukin-6 receptor (sIL-6R) can act as an agonist, modulating inflammation.
- The role of pleural sIL-6R in pleural diseases and acute-phase protein induction is unclear.
Purpose of the Study:
- To investigate the role of pleural sIL-6R in the differential diagnosis of pleural diseases.
- To assess the role of pleural sIL-6R in the induction of acute-phase proteins.
Main Methods:
- Sandwich enzyme-linked immunosorbent assays (ELISAs) were employed.
- sIL-6R and interleukin-6 (IL-6) levels were measured in pleural effusions.
- Effusions analyzed included tuberculous, malignant, and transudative types.
Main Results:
- No significant differences in pleural sIL-6R levels were observed across different pleural disease groups.
- Pleural IL-6 levels varied significantly, while pleural sIL-6R levels were consistently lower than serum levels.
- Pleural IL-6 levels, but not sIL-6R, correlated with serum C-reactive protein (CRP) levels.
Conclusions:
- Pleural sIL-6R levels are not elevated in severe inflammation like tuberculous pleurisy and do not differ significantly among pleural diseases.
- Local pleural sIL-6R levels appear less critical than anticipated for acute-phase protein induction in pleural diseases.