Simultaneous cell surface phenotype and cell cycle analysis of lymphocytes by flow cytometry

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Analyzing cell surface changes during the cell cycle requires methods that can assess both surface markers and nucleic acid content.
• Existing methods may not allow for simultaneous measurement, limiting comprehensive cell cycle analysis.

Purpose of the Study:

• To develop and validate a flow cytometry method for simultaneous measurement of human lymphocyte surface components and nucleic acids (DNA and RNA).
• To enable the analysis of cell surface alterations across different phases of the cell cycle.

Main Methods:

• Developed a sequential staining protocol for unfixed human lymphocytes.
• Utilized fluorescein-conjugated concanavalin A (F Con A) or specific antibodies for surface staining.
• Employed paraformaldehyde and methanol fixation, followed by nuclease treatment and propidium iodide staining for nucleic acids.
• Validated the method by comparing cell cycle phase determination with acridine orange staining and using cell cycle-specific blocking agents.

Main Results:

• The developed method allows for simultaneous measurement of cell surface markers and nucleic acids without significant interference between staining procedures.
• Cell cycle phase analysis of phytohemagglutinin-stimulated lymphocytes using this method showed comparable results to acridine orange staining.
• Specificity of the staining procedure was confirmed using cell cycle-specific blocking agents.
• Demonstrated simultaneous measurement of cell cycle phase and detection of surface receptors for Con A and T lymphocyte determinants.

Conclusions:

• The novel flow cytometry method provides a reliable means for simultaneous analysis of cell surface components and nucleic acid content in human lymphocytes.
• This technique facilitates the study of cell surface dynamics throughout the cell cycle, offering insights into lymphocyte activation and differentiation.