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A stable propidium iodide staining procedure for flow cytometry.

A D Deitch, H Law, R deVere White

    The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
    |September 1, 1982
    PubMed
    Summary
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    This study details a simple propidium iodide staining method for DNA analysis in various cells. Optimized RNAse incubation and storage conditions ensure stable, reliable flow cytometry results over time.

    Area of Science:

    • Cell Biology
    • Biotechnology
    • Analytical Chemistry

    Background:

    • Accurate DNA content analysis via flow cytometry is crucial for biological research.
    • Standard propidium iodide (PI) staining protocols require optimization for RNA removal and sample stability.

    Purpose of the Study:

    • To describe and validate a robust propidium iodide (PI) staining procedure for DNA analysis.
    • To establish optimal conditions for RNAse digestion and sample storage for flow cytometry.

    Main Methods:

    • Utilized propidium iodide (PI) staining with RNAse treatment for DNA-specific fluorescence.
    • Investigated varying RNAse concentrations and incubation times on murine erythroleukemia cells (MELC).
    • Assessed sample stability under different storage conditions (refrigeration, freezing) and with preservatives.

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    Main Results:

    • Achieved specific nuclear DNA staining by enzymatic RNA removal.
    • Identified optimal RNAse incubation times (e.g., 30 min at 37°C for 1 mg/ml RNAse) for consistent histograms.
    • Demonstrated long-term stability of stained unfixed cells for over 2 weeks at 4°C, and up to 1-2 months with preservatives like sodium azide and glycerol.

    Conclusions:

    • The described PI staining method is simple, reproducible, and yields stable results.
    • Optimized RNAse digestion and storage protocols enhance reliability for comparative flow cytometry.
    • This procedure is suitable for long-term, repetitive sampling and analysis of cell populations.