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An improved fluorescence probe cytotoxicity assay.

R J Brawn, C R Barker, A D Oesterle

    Journal of Immunological Methods
    |November 1, 1975
    PubMed
    Summary
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    [Chalazion].

    Praxis·2011

    A new assay uses ethidium bromide dye to detect antibody-mediated cytotoxicity in cells. This method measures fluorescence enhancement in non-viable cells, offering a rapid and sensitive tool for research.

    Area of Science:

    • Cell biology
    • Immunology
    • Biochemistry

    Background:

    • Ethidium bromide, a phenanthridine dye, is excluded by viable cells.
    • It exhibits enhanced fluorescence upon binding to intracellular double-stranded polyribonucleotides.
    • Cell death leads to loss of membrane integrity, allowing dye entry.

    Purpose of the Study:

    • To develop a rapid and sensitive assay for antibody-mediated cytotoxicity.
    • To utilize the fluorescence enhancement of ethidium bromide as a detection method.
    • To characterize the assay and demonstrate its application in studying viral transformation.

    Main Methods:

    • Developed a fluorescence probe cytotoxicity assay using ethidium bromide.
    • Designed a sensitive electro-optical system to measure fluorescence enhancement.

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  • Applied the assay to study neoantigens on SV40-transformed cells.

    • Main Results:

    • Demonstrated significant fluorescence enhancement of ethidium bromide in non-viable cells.
    • Established the assay's sensitivity and rapidity for detecting cytotoxicity.
    • Successfully used the assay to investigate surface membrane neoantigens.

    Conclusions:

    • The ethidium bromide fluorescence probe cytotoxicity assay is a sensitive and rapid method.
    • This assay is valuable for studying antibody-mediated cell killing.
    • It can be applied to investigate cellular changes in virally transformed cells.