Leukocyte Reduction Filters Are Reliable and Economic Source for Natural Killer Cell Preparation

Area of Science:

• Immunology
• Cell Biology
• Hematology

Background:

• Natural Killer (NK) cells are crucial for immune responses but are found in low proportions in peripheral blood.
• Current methods for obtaining NK cells are time-consuming and expensive, limiting research accessibility.

Purpose of the Study:

• To investigate the potential of used leukocyte reduction filters as a source of Natural Killer (NK) cells.
• To evaluate the feasibility of utilizing a readily available byproduct of blood transfusion for NK cell research.

Main Methods:

• Peripheral blood and leukocyte reduction filters from 46 donors were collected.
• Cells were flushed from filters, and both filter-derived and blood-derived cells were analyzed.
• NK cell isolation was performed using MACS negative selection.
• Comparative analysis included flow cytometry for subpopulation composition, viability, degranulation, and cytotoxic capacity against K562 cells.

Main Results:

• Leukocyte reduction filters contained abundant major leukocyte populations, including NK cells.
• NK cells from filters showed no statistically significant differences in composition, viability, degranulation, or cytotoxic capacity compared to peripheral blood NK cells.
• P-value < 0.5 indicated no significant difference.

Conclusions:

• Used leukocyte reduction filters represent an economical and accessible source of research-grade NK cells.
• This method offers a practical alternative for researchers needing abundant NK cells.
• The findings support the repurposing of blood transfusion byproducts for scientific research.