Changes in soluble ICAM-1 level during hemodialysis

Area of Science:

• Immunology
• Nephrology
• Cell Biology

Background:

• Intercellular adhesion molecule-1 (ICAM-1) is crucial for cell interactions and is found on lymphocytes, monocytes, and endothelial cells.
• Soluble ICAM-1 (sICAM-1) levels rise in inflammatory conditions, and leukocyte function is known to be impaired in chronic hemodialysis patients.
• ICAM-1 can be shed from cell membranes into circulation.

Purpose of the Study:

• To investigate the impact of hemodialysis (HD) on lymphocytes and monocytes.
• To measure serum sICAM-1 concentrations periodically during HD.
• To assess the relationship between HD and sICAM-1 shedding.

Main Methods:

• Serum sICAM-1 levels were measured in chronic hemodialysis patients before and during HD sessions.
• Levels were compared between the arterial and venous sides of the dialyzer.
• Patients using regenerated cellulose and polymethylmethacrylate membranes were compared.

Main Results:

• Pre-HD sICAM-1 levels were significantly elevated in patients compared to healthy subjects.
• sICAM-1 levels increased significantly from baseline 240 minutes after HD initiation.
• sICAM-1 levels were higher at the venous side compared to the arterial side of the dialyzer.
• No significant difference in sICAM-1 levels was observed between the two membrane types.

Conclusions:

• Hemodialysis stimulates the shedding of ICAM-1 from mononuclear cells (lymphocytes and monocytes).
• The increase in sICAM-1 during HD suggests a link between the dialysis membrane and cell activation.
• Chronic hemodialysis may compromise mononuclear cell function through ICAM-1 shedding.