Neutrophils Vanish: A New Look at Polymyxin B Columns

Polymyxin B‑immobilized fibers, traditionally used to filter endotoxins in severe infections, are now being repurposed to clear white blood cells from the bloodstream. This innovative approach could benefit patients with acute lung injury who do not have an infection.

The Experiment

• Objective: Test whether the columns can remove activated leukocytes.
• Method: Columns were exposed to various activated leukocyte types in a controlled lab setting.
• Measurements: Count of cells adhered to the fibers and the speed of adhesion.

Key Findings

• Neutrophils dominate removal: These cells were captured far more efficiently than other leukocyte groups.
• Specific targeting: The fibers preferentially bind neutrophils, even when the cells are not engaged in bacterial defense.
• Implication: The columns may reduce harmful neutrophil activity, offering a therapeutic strategy for inflammation‑driven conditions.

Next Steps

• Clinical validation: Confirm the effect in living patients.
• Long‑term outcomes: Assess safety and efficacy over time.

This discovery opens a new avenue for using existing medical devices in unexpected ways, potentially expanding the therapeutic utility of polymyxin B‑immobilized fibers beyond endotoxin removal.