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Dual-laser, differential fluorescence correction method for reducing cellular background autofluorescence.

J A Steinkamp, C C Stewart

    Cytometry
    |November 1, 1986
    PubMed
    Summary
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    This new method quantifies low antibody binding on autofluorescent cells by subtracting autofluorescence. It effectively reduces background noise, enabling clearer detection of fluorescent labels in biological samples.

    Area of Science:

    • Cellular and Molecular Biology
    • Biophotonics
    • Immunofluorescence Assays

    Background:

    • Intrinsic cellular autofluorescence complicates quantification of specific antibody binding.
    • High autofluorescence in cells like macrophages can obscure low-level signals from fluorescently labeled antibodies.

    Purpose of the Study:

    • To develop a method for reducing autofluorescence background in cells labeled with fluorescent antibodies.
    • To enable accurate quantification of low antibody-binding levels on highly autofluorescent cells.

    Main Methods:

    • Utilized two laser wavelengths: one exciting both the fluorescent label and autofluorescence, and another exciting only autofluorescence.
    • Employed a difference amplifier for cell-by-cell signal subtraction in the same wavelength region.

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  • Balanced signal inputs to the difference amplifier to zero autofluorescence and amplify the specific fluorescent signal.

    • Main Results:

    • Demonstrated significant reduction of autofluorescence in unlabeled and labeled macrophages.
    • Successfully amplified the fluorescent-labeled antibody-binding component.
    • Achieved resolution of labeled lymphocytes from unlabeled autofluorescent macrophages.

    Conclusions:

    • The developed method effectively reduces intrinsic autofluorescence, allowing for precise quantification of antibody binding.
    • This technique enhances the sensitivity of immunofluorescence assays in autofluorescent biological systems.
    • Enables differentiation and quantification of specific cellular targets even in complex, autofluorescent environments.