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Circulating ICAM-1 isoforms: diagnostic prospects for inflammatory and immune disorders
R Seth1, F D Raymond, M W Makgoba
1Department of Chemical Pathology, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.
Insights
Researchers detected free circulating Intercellular Adhesion Molecule-1 (ICAM-1, CD54) in human serum using a sensitive assay. This finding opens new avenues for diagnosing and monitoring immune and inflammatory disorders.
Area of Science:
- Immunology
- Biochemistry
- Medical Diagnostics
Background:
- Intercellular Adhesion Molecule-1 (ICAM-1, CD54) is a key marker of immune activation.
- Previously, evidence relied on tissue staining as free circulating ICAM-1 was undetected.
Purpose of the Study:
- To detect and characterize free circulating ICAM-1 in human serum.
- To explore the potential diagnostic and therapeutic implications of circulating ICAM-1.
Main Methods:
- Utilized monoclonal antibodies against ICAM-1.
- Employed a sensitive chemiluminescence technique for detection.
- Applied non-denaturing gel electrophoresis for isoform analysis.
Main Results:
- Successfully detected free circulating ICAM-1 in serum from healthy volunteers.
- Observed significant variation in ICAM-1 concentrations among individuals.
- Identified at least three circulating ICAM-1 isoforms with varying proportions.
Conclusions:
- Circulating ICAM-1 can be detected and quantified in human serum.
- The presence and isoforms of ICAM-1 may serve as valuable biomarkers.
- Findings support ICAM-1's role in investigating inflammatory, neoplastic, and immune disorders.
Abstract:
Intercellular adhesion molecule-1 (ICAM-1, CD54) is an important early marker of immune activation and response. Evidence on its role has come from immunohistological staining of tissues, since no free circulating ICAM-1 has been detected. By means of monoclonal antibodies against ICAM-1 and a sensitive chemiluminescence technique, free circulating ICAM-1 was detected in serum from sixteen healthy young volunteers. The concentrations varied among the subjects. Non-denaturing gel separation methods showed that ICAM-1 circulates in at least three isoforms, the proportions of which also varied. These findings have important implications for the investigation, diagnosis, and therapeutic monitoring of various inflammatory, neoplastic, and immune disorders.
