DNA histogram analysis of human hemopoietic cells

Area of Science:

• Oncology
• Cell Biology
• Biotechnology

Background:

• Proliferative activity in human neoplasms impacts therapeutic strategies.
• Automated flow-through systems for measuring cellular DNA content via fluorescence have advanced cellular kinetic analysis.

Purpose of the Study:

• To evaluate three fluorescent staining techniques for DNA histogram measurement in human hemopoietic cells using pulse cytophotometry.
• To compare DNA histogram-derived S-phase fractions with the tritiated thymidine labeling index.

Main Methods:

• Utilized a pulse cytophotometer (ICP-11).
• Tested mithramycin, ethidium bromide, and a combination of both for DNA staining.
• Compared results with the tritiated thymidine labeling index.

Main Results:

• Linear correlations were achieved with ethidium bromide alone and the two-dye combination.
• The two-dye combination increased fluorescence intensity 4-5 fold.
• This resulted in a decreased coefficient of variation (1.5%-2%) for DNA histograms.

Conclusions:

• The two-dye staining technique significantly enhances DNA histogram resolution.
• Improved resolution aids in detecting chromosomal aberrations and drug effects.
• This method offers a more precise approach to analyzing cellular kinetics in neoplasms.