Soluble and cell surface ICAM-1 as markers for disease activity in multiple sclerosis

Area of Science:

• Immunology
• Neuroscience

Background:

• Intercellular adhesion molecule-1 (ICAM-1) is an Ig supergene family member expressed on various cells.
• ICAM-1 expression is induced by cytokines and can be shed into a soluble form.
• Investigating ICAM-1 in multiple sclerosis (MS) is crucial for understanding disease activity.

Purpose of the Study:

• To determine if cell surface and soluble ICAM-1 levels in cerebrospinal fluid (CSF) and blood indicate disease activity in MS patients.
• To correlate ICAM-1 expression with relapse and remission phases of MS.

Main Methods:

• Two-color flow cytometry was used to measure cell surface ICAM-1 (c-ICAM-1) on leukocytes.
• Enzyme-linked immunosorbent assay (ELISA) measured soluble ICAM-1 (s-ICAM-1).
• Patients with relapsing-remitting MS (n=31 relapse, n=11 remission) and controls (n=13) were studied, with follow-up at 3 months.

Main Results:

• Significantly decreased c-ICAM-1 expression on leukocytes in CSF (P<0.001) and blood (P<0.10) during MS relapses compared to remission.
• Significantly increased s-ICAM-1 levels in CSF of MS patients with relapses (P<0.05).
• Stable c-ICAM-1 expression on CD3+ T-cells in blood was observed between different remission durations.

Conclusions:

• Cell surface ICAM-1 on CD3+ T-cells in CSF and blood serves as an activity marker in MS.
• These findings provide novel insights into the role of ICAM-1 in MS pathogenesis and activity monitoring.