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Related Experiment Videos

Flow-cytometric detection of circulating immune complexes.

M Lightfoote, T M Folks, R Redfield

    Journal of Immunological Methods
    |December 4, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    Flow cytometry (FCM) offers a rapid, sensitive, and efficient method for detecting circulating immune complexes, outperforming traditional radioimmunoassay (RIA) by threefold. This advanced technique analyzes viable cells, providing immediate data for further analysis of complex components.

    Area of Science:

    • Immunology
    • Cell Biology
    • Analytical Chemistry

    Background:

    • Circulating immune complexes (CICs) are implicated in various autoimmune and infectious diseases.
    • Current detection methods, such as radioimmunoassay (RIA), can be time-consuming and less sensitive.
    • There is a need for rapid, sensitive, and efficient assays for CIC analysis.

    Purpose of the Study:

    • To adapt the Raji cell radioimmunoassay (RIA) for flow cytometric (FCM) analysis.
    • To evaluate the effectiveness and efficiency of FCM for detecting and analyzing CICs.
    • To leverage FCM's capabilities for detailed characterization of CICs and involved cells.

    Main Methods:

    • Raji cells were utilized in a flow cytometry (FCM) assay adapted from the radioimmunoassay (RIA) method.

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  • FCM gating strategies were employed to exclude non-viable cells, ensuring analysis of only live cells with bound immune complexes.
  • Fluorescently labeled monoclonal antibodies targeting complement components, viral antigens, light chains, and immunoglobulin isotypes were used for multi-parametric analysis.

    • Main Results:

    • FCM detection of CICs demonstrated a threefold increase in sensitivity compared to the traditional RIA method.
    • The FCM assay provided rapid determinations with immediately available data for further analysis.
    • The method allowed for the characterization of Raji cells in different cell cycle stages, providing insights into receptor density and binding status.

    Conclusions:

    • Flow cytometry offers a superior alternative to RIA for the rapid and sensitive detection and analysis of circulating immune complexes.
    • FCM enables detailed characterization of CIC components and the cellular interactions involved in their binding.
    • This adapted FCM assay enhances diagnostic capabilities for diseases associated with immune complex formation.