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Updated: Feb 8, 2026

Label-free Neutrophil Enrichment from Patient-derived Airway Secretion Using Closed-loop Inertial Microfluidics
07:37

Label-free Neutrophil Enrichment from Patient-derived Airway Secretion Using Closed-loop Inertial Microfluidics

Published on: June 7, 2018

6.8K

Label-free Neutrophil Enrichment from Patient-derived Airway Secretion Using Closed-loop Inertial Microfluidics

Hyunryul Ryu1, Kyungyong Choi2, Yanyan Qu3

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology.

Journal of Visualized Experiments : Jove
|June 26, 2018
PubMed

Insights

This study presents a novel microfluidic method to isolate immune cells from airway secretions. The technique efficiently recovers over 95% of neutrophils without damaging them, aiding pulmonary disease research.

Area of Science:

  • Biomedical Engineering
  • Immunology
  • Microfluidics

Background:

  • Airway secretions contain vital immune cells for pulmonary disease assessment.
  • Existing methods for isolating these cells from viscous mucus often damage them.
  • A reliable, non-damaging method is needed for immune cell analysis in airway secretions.

Purpose of the Study:

  • To develop and validate a microfluidic-based sample preparation method for immune cell isolation from airway secretions.
  • To achieve high recovery and purity of immune cells, specifically neutrophils, without compromising their viability.
  • To enable robust immune cell assessment for research and clinical applications in pulmonary diseases.

Main Methods:

  • Utilized inertial microfluidics, specifically spiral microfluidic channels, for cell separation.
  • Employed a closed-loop recirculation system to enhance cell concentration and purity.
  • Validated the method's efficiency and cell integrity using patient airway secretion samples.

Main Results:

  • Achieved over 95% recovery of neutrophils from diluted airway secretion samples.
  • Demonstrated high concentration and purity of isolated immune cells through recirculation.
  • Confirmed the viability and functional integrity of sorted neutrophils via PMA-induced elastase release assay.

Conclusions:

  • Inertial microfluidics offers a robust and gentle method for isolating immune cells from complex airway secretions.
  • The developed closed-loop system overcomes limitations of single-run microfluidic devices for sample preparation.
  • This technique holds significant potential for advancing the study and diagnosis of pulmonary diseases through immune cell analysis.

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