Probing cell proliferation: Considerations for dye selection.

Area of Science:

• Cell Biology
• Immunology
• Biotechnology

Background:

• Cell tracking dyes are fluorescent compounds used to monitor cell fate and proliferation.
• Two main classes exist: protein-reactive dyes (e.g., CFSE) and membrane-intercalating dyes (e.g., PKH).
• Effective cell tracking requires bright, homogeneous staining without impacting cell function or viability.

Purpose of the Study:

• To provide considerations for labeling cell lines and peripheral blood mononuclear cells using both protein-reactive and membrane-intercalating dyes.
• To present optimization experiments and critical staining procedures to mitigate common risks.
• To compare dye loss rates between protein-reactive and membrane-intercalating dyes.

Main Methods:

• Labeling of cell lines and peripheral blood mononuclear cells with protein-reactive and membrane-intercalating dyes.
• Optimization of staining procedures.
• Comparative analysis of dye loss rates over six days using dual-stained cells.

Main Results:

• Dual-stained cells exhibited dye loss patterns similar to single-stained cells.
• Protein-reactive dyes demonstrated a more rapid decrease in fluorescence intensity compared to membrane-intercalating dyes.
• This faster loss suggests additional division-independent dye loss mechanisms for protein-reactive dyes.

Conclusions:

• Both protein-reactive and membrane-intercalating dyes can be effectively used for cell tracking, with proper optimization.
• Membrane-intercalating dyes may offer more stable long-term tracking due to slower, potentially division-dependent loss.
• Understanding dye loss kinetics is crucial for accurate interpretation of cell proliferation and fate studies.