Five-dimensional flow cytometry as a new approach for blood and bone marrow differentials

Area of Science:

• Hematology
• Cell Biology
• Analytical Chemistry

Background:

• Accurate quantification and differentiation of cellular components in blood and bone marrow are crucial for diagnosing various hematological conditions.
• Traditional flow cytometry methods often require erythrocyte lysis, which can affect cell integrity and analysis.
• There is a need for advanced techniques that can provide precise cell discrimination without compromising sample quality.

Purpose of the Study:

• To develop and validate a novel five-dimensional flow cytometry approach for discriminating and quantifying cellular components in blood and bone marrow aspirates.
• To establish cell classification criteria within a five-dimensional space using multiple independent variables.
• To achieve cell discrimination without the necessity of erythrocyte lysis.

Main Methods:

• Utilized a flow cytometer with five independent variables to create a five-dimensional space for cell analysis.
• Employed forward and orthogonal light-scattering signals combined with three fluorescence variables.
• Used thiazole orange (RNA binding) and LDS-751 (DNA detection) for differentiating erythrocytes, platelets, reticulocytes, and nucleated cells.
• Incorporated a CD45 monoclonal antibody conjugated with phycoerythrin to aid in nucleated cell lineage discrimination.

Main Results:

• Successfully differentiated and quantified nine distinct cell categories: erythrocytes, reticulocytes, nucleated erythroid cells, platelets, lymphocytes, monocytes, neutrophils, eosinophils, and immature leukocytes.
• Achieved precise cell classification based on unique criteria within the five-dimensional space.
• Demonstrated effective cell discrimination without the need for erythrocyte lysis, preserving sample integrity.

Conclusions:

• The developed five-dimensional flow cytometry method offers a robust and accurate approach for cellular component analysis in hematological samples.
• This technique provides enhanced discrimination capabilities, including differentiation of nucleated cell lineages, without erythrocyte lysis.
• The findings have significant implications for improving the accuracy and efficiency of hematological diagnostics.