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Related Experiment Videos

Homogeneous, liposome-based assay for total complement activity in serum.

D W Bowden, M Rising, G Akots

    Clinical Chemistry
    |February 1, 1986
    PubMed
    Summary
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    This study introduces a novel liposome-based assay for measuring total complement activity in human serum. The assay is rapid, homogeneous, and avoids radioisotopes, offering a simpler alternative to existing methods.

    Area of Science:

    • Immunology
    • Biochemistry
    • Assay Development

    Background:

    • Complement system plays a crucial role in innate and adaptive immunity.
    • Accurate measurement of total complement activity is essential for diagnosing and monitoring various diseases.
    • Existing methods for complement activity assessment can be time-consuming or complex.

    Purpose of the Study:

    • To develop and validate a rapid, homogeneous, liposome-based assay for quantifying total complement activity in human serum.
    • To compare the performance of the new assay with established methods, including hemolytic complement assays and complement component measurements.
    • To establish reference values for total complement activity in a normal population.

    Main Methods:

    • A liposome-based assay utilizing encapsulated enzyme unmasked by complement-mediated immune complex interaction.

    Related Experiment Videos

  • Quantification of unmasked enzyme by measuring absorbance at 410 nm.
  • Standard curve generation using dilutions of guinea pig serum with known complement activity.

    • Main Results:

    • The assay demonstrated high precision with interassay coefficients of variation (CVs) <7.0% and intra-assay CVs <2.8%.
    • Test results showed good correlation with the hemolytic complement test (r=0.80) and reasonable correlation with C3 (r=0.62) and C4 (r=0.74) levels.
    • The assay is rapid, stable, simple to perform, and does not require radioisotopes.

    Conclusions:

    • The developed liposome-based assay provides a reliable and efficient method for assessing total complement activity in human serum.
    • This assay offers significant advantages in terms of speed, simplicity, and reagent stability compared to traditional methods.
    • The assay's performance and correlation with other measures support its utility in clinical and research settings.