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Published on: April 9, 2013
In Vitro Assay for Sensitive Determination of Human Blood PMN Responses
Noah Fine1, William Khoury1, Michael Glogauer2,3,4
1Faculty of Dentistry, University of Toronto, Toronto, ON, Canada.
Abstract:
Polymorphonuclear neutrophils (PMNs) are the most common leukocytes in the circulation and exhibit a wide range of distinct cellular phenomena as part of their microbicidal killing activities, including degranulation, phagocytosis, reactive oxygen species (ROS) production, adhesion, chemotaxis and production of PMN Extracellular Traps (NETs). As a simple in vitro test of PMN functional responses in human blood we have developed a multicolor flow cytometry-based assay of PMN cluster of differentiation (CD) surface marker expression. Short incubations of whole human blood can be performed in the presence of a wide range of agonists or inhibitors, followed by sensitive detection of changes in CD marker expression. This protocol has the advantage that small amounts of human blood are necessary and there are no PMN isolation steps, which can alter PMN activation status.
Insights
This study presents a new multicolor flow cytometry assay to measure polymorphonuclear neutrophil (PMN) functional responses in human blood. The assay analyzes changes in PMN surface marker expression without isolating cells, simplifying functional testing.
Area of Science:
- Immunology
- Cell Biology
- Hematology
Background:
- Polymorphonuclear neutrophils (PMNs) are critical immune cells involved in microbicidal activities.
- PMN functions include degranulation, phagocytosis, ROS production, adhesion, chemotaxis, and NET formation.
- Assessing PMN function is vital for understanding immune responses and diseases.
Purpose of the Study:
- To develop a simple, in vitro assay for evaluating human PMN functional responses.
- To utilize multicolor flow cytometry for sensitive detection of PMN activation.
- To establish a method that avoids PMN isolation, preserving their natural activation status.
Main Methods:
- Development of a multicolor flow cytometry assay using whole human blood.
- Incubation of blood with various agonists or inhibitors.
- Detection of changes in PMN cluster of differentiation (CD) surface marker expression.
Main Results:
- The assay allows for sensitive detection of PMN functional responses.
- It requires only small amounts of human blood.
- The protocol avoids cell isolation, preventing artificial changes in PMN activation.
Conclusions:
- A novel, simplified flow cytometry assay for human PMN functional testing has been established.
- This method offers a reliable way to study PMN responses in vitro.
- The assay is advantageous for its simplicity, minimal sample requirement, and preservation of PMN integrity.
