Single-Cell Flow Cytometry Profiling of BAL in Children

Area of Science:

• Pediatric Pulmonology
• Immunology
• Cell Biology

Background:

• Childhood pulmonary diseases lead to significant morbidity, mortality, and long-term impairment.
• Understanding the pathophysiology of these diseases is crucial for effective clinical management.
• Limited knowledge exists on cell populations in pediatric bronchoalveolar lavage (BAL) and the impact of sample handling.

Purpose of the Study:

• To develop and validate a flow cytometry protocol for the purification and characterization of diverse immune cell populations in pediatric BAL.
• To assess the impact of cryopreservation on cell phenotype and frequency in pediatric BAL samples.
• To establish a comprehensive method for investigating the cellular basis of childhood pulmonary diseases.

Main Methods:

• Development of a multi-parameter flow cytometry panel for simultaneous quantification of alveolar macrophages, T cells (CD4, CD8), B cells, NK cells, dendritic cells, granulocytes, and monocytes (CD16+/CD16-).
• Application of the protocol to bronchoalveolar lavage (BAL) samples from children.
• Evaluation of the effects of cryopreservation on the identified cell populations.

Main Results:

• Successful simultaneous quantification of multiple immune cell types in pediatric BAL using flow cytometry.
• Characterization of alveolar macrophages, T cells, B cells, NK cells, dendritic cells, granulocytes, and monocytes.
• Data on the stability and changes in cell phenotype and frequency following cryopreservation.

Conclusions:

• The described flow cytometry method provides a robust tool for detailed cellular analysis in pediatric BAL.
• This approach addresses a critical knowledge gap regarding cell characterization and cryopreservation effects in pediatric lung research.
• The protocol facilitates deeper investigation into the pathophysiology of childhood pulmonary diseases, potentially improving diagnosis and treatment.