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Related Experiment Videos

Automated homogeneous liposome-based assay system for total complement activity

S Yamamoto1, K Kubotsu, M Kida

  • 1Osaka Research Laboratories, Wako Pure Chemical Industries, Ltd., Hyogo, Japan.

Clinical Chemistry
|April 1, 1995
PubMed
Summary
This summary is machine-generated.

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This study introduces a new automated assay for measuring total complement activity using liposome lysis. The method is precise, reliable, and suitable for routine clinical use, correlating well with existing tests.

Area of Science:

  • Biochemistry
  • Immunology
  • Clinical Chemistry

Background:

  • Complement activity is crucial for immune function and disease diagnosis.
  • Existing methods for complement activity measurement can be complex or time-consuming.
  • A need exists for a rapid, automated, and reliable assay for total complement activity.

Purpose of the Study:

  • To develop and validate an automated homogeneous immunoassay for measuring total complement activity.
  • To adapt the assay for use on routine clinical analyzers.
  • To assess the assay's precision, accuracy, and interference potential.

Main Methods:

  • Developed a homogeneous immunoassay utilizing immune lysis of dinitrophenyl (DNP)-labeled liposomes.
  • Quantified liposome lysis spectrophotometrically by measuring entrapped glucose-6-phosphate dehydrogenase activity.

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  • Employed a two-reagent system for automated clinical analyzers, requiring weekly calibration.

    • Main Results:

    • Achieved high precision with within-run coefficients of variation (CVs) of 0.4-1.3% and between-run CVs of 1.8-4.7%.
    • Demonstrated linearity upon dilution and found no significant interference from common substances like bilirubin, hemoglobin, or various serum proteins.
    • Showed excellent correlation (r = 0.92) with a standard hemolytic complement activity test.

    Conclusions:

    • The developed automated immunoassay is a precise, accurate, and robust method for determining total complement activity.
    • Its ease of use and suitability for automated analyzers make it valuable for routine clinical diagnostics.
    • This assay offers a significant advancement for complement activity determination in clinical settings.