Multiparametric cell-cycle analysis of peripheral blood-activated lymphocyte subsets using staining based on the TdT...

Area of Science:

• Cell Biology
• Immunology
• Biotechnology

Background:

• Accurate cell-cycle phase determination is crucial for understanding cell proliferation and response to stimuli.
• Existing methods for cell-cycle analysis can be complex or lack precision in distinguishing all phases simultaneously.

Purpose of the Study:

• To develop and validate a new, simplified method for simultaneous cell-cycle phase assessment (G0/G1, S, G2/M).
• To enable cell-cycle analysis of specific immune cell subpopulations using multiparameter flow cytometry.

Main Methods:

• Utilized multiparameter flow cytometry with bromodeoxyuridine (BrdUrd) incorporation for DNA synthesis detection.
• Employed single staining with digoxigenin-labeled dUTP and FITC-labeled anti-digoxigenin antibody.
• Applied ultraviolet treatment and ethanol fixation for cell preparation.
• Analyzed K562 cell line and peripheral blood lymphocytes (PBL) for cell-cycle phase distribution and subpopulation analysis.

Main Results:

• Successfully discriminated G0/G1, S, and G2/M cell populations based on FITC fluorescence and light-scatter parameters.
• Identified S-phase cells by their FITC staining.
• Resolved G0/G1 and G2/M populations from BrdUrd-negative cells using forward scatter, side scatter, and fluorescence pulse-width.
• Enabled cell-cycle analysis of distinct PBL subpopulations (e.g., CD3+/CD8+) using multiparameter staining.

Conclusions:

• The developed method provides a clear and simultaneous assessment of cell-cycle distribution.
• This technique allows for precise identification of S-phase cells and differentiation between G0/G1 and G2/M phases.
• The method is applicable to analyzing cell-cycle kinetics within specific immune cell subsets.