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Time-resolved fluoroimmunoassay for bactericidal/permeability-increasing protein
J O Häggblom1, A B Jokilammi-Siltanen, H Peuravuori
1Department of Pathology University of Turku Kiinanmyllynkatu 10 Turku FIN-20520 Finland.
Mediators of Inflammation
|January 1, 1996
Summary
Bactericidal/permeability-increasing protein (BPI) is crucial for fighting Gram-negative bacteria. A new assay reliably measures BPI levels in human serum, showing higher concentrations in infected patients.
Area of Science:
- Biochemistry
- Immunology
- Microbiology
Background:
- Bactericidal/permeability-increasing protein (BPI) is a cationic antimicrobial protein produced by polymorphonuclear leukocytes.
- BPI targets Gram-negative bacteria and modulates lipopolysaccharide (LPS)-induced inflammation by competing with lipopolysaccharide-binding protein (LBP).
Purpose of the Study:
- To develop and validate a time-resolved fluoroimmunoassay for quantifying BPI in human serum and plasma.
- To investigate the diagnostic potential of BPI measurements in hospitalized patients.
Main Methods:
- Development of a time-resolved fluoroimmunoassay using a rabbit antibody against recombinant BPI.
- Measurement of BPI concentrations in serum and plasma samples from hospitalized patients.
- Correlation analysis of BPI levels with white blood cell count and C-reactive protein (CRP).
Main Results:
- The developed assay reliably quantifies BPI in human serum.
- Serum BPI concentrations were significantly higher in infected patients compared to non-infected patients.
- Plasma BPI levels were consistently higher than serum BPI levels, but showed no significant difference between patient groups.
Conclusions:
- Time-resolved fluoroimmunoassay is a reliable method for quantifying BPI in human serum.
- Serum BPI levels show potential as a biomarker for infection in hospitalized patients.
- Further research is needed to understand the discrepancy between serum and plasma BPI levels.
