An Optimized Protocol for the Isolation and Functional Analysis of Human Lung Mast Cells

Area of Science:

• Immunology
• Cell Biology
• Respiratory Medicine

Background:

• Mast cells are heterogeneous inflammatory cells crucial in immune responses.
• Human lung mast cells display variations in size, receptors, and mediators.
• Current isolation methods limit comprehensive analysis of mast cell heterogeneity.

Purpose of the Study:

• To develop a high-yield protocol for isolating human lung mast cells.
• To enable detailed functional and molecular analyses using single-cell techniques.
• To overcome limitations of existing immunohistochemistry and cell purification methods.

Main Methods:

• A novel sequential protocol (WEMP: washing, enzymatic digestion, mechanical disruption, Percoll density centrifugation) was employed.
• Mast cells were isolated from human lung tissue.
• Comparison with a conventional enzyme-based isolation protocol.
• Analysis of isolated cells using flow cytometry.

Main Results:

• The WEMP protocol significantly increased the yield of CD45+ immune cells and CD117+ mast cells.
• Yield improvements were more pronounced for mast cells compared to conventional methods.
• Isolation of innate lymphoid cells group 2 (ILC2) remained consistent between methods.

Conclusions:

• The WEMP protocol offers a substantial improvement in human lung mast cell yield.
• This method facilitates simultaneous isolation of diverse immune cell populations (lymphocytes, monocytes, granulocytes).
• Isolated cells retain surface marker expression suitable for advanced single-cell analyses like flow cytometry and RNA-sequencing.