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Demonstration of specific detection of anti-HCV IgM core antibodies
H P Kapprell1, G Michel, H Hampl
1Abbott GmbH Diagnostika, Wiesbaden, Germany.
Insights
This study confirms the specificity of hepatitis C virus (HCV) core IgM antibody detection. The assay is reliable, showing no interference from rheumatoid factor or other immunoglobulin isotypes in patient samples.
Area of Science:
- Virology
- Immunology
- Diagnostic Assay Development
Background:
- Hepatitis C virus (HCV) infection diagnosis relies on accurate antibody detection.
- Distinguishing specific IgM responses from other immunoglobulins is crucial for early diagnosis.
Purpose of the Study:
- To demonstrate the specificity of the IgM isotype response against the hepatitis C virus core antigen (HCV core IgM).
- To evaluate potential interferences in HCV IgM enzyme immunoassays (EIA).
Main Methods:
- Testing HCV IgM EIA reactive samples for specificity.
- Assessing interference from rheumatoid factor (RF) and anti-HCV IgG (HCV IgG).
- Evaluating sera from patients with monoclonal gammapathies.
- Utilizing Protein G affinity chromatography and sucrose density gradient centrifugation.
Main Results:
- HCV core IgM specificity was confirmed in reactive samples.
- No interference was observed with varying levels of RF or HCV IgG.
- Assay specificity remained intact in patients with monoclonal gammapathies.
- HCV core IgM antibodies showed distinct binding and sedimentation properties compared to RF/HCV IgG complexes.
Conclusions:
- The developed assay accurately detects specific IgM responses to HCV core antigen.
- The assay demonstrates high specificity and is unaffected by common interfering factors.
- This contributes to reliable diagnostic tools for hepatitis C virus infection.
Abstract:
The specificity of IgM isotype response directed against the putative core of hepatitis C virus (HCV core IgM) was demonstrated in HCV IgM EIA reactive samples. No interference was noted when samples with increasing levels of rheumatoid factor (RF) alone, or in combination with graded concentrations of anti-HCV IgG (HCV IgG), were tested. No deterioration in assay specificity was seen in 30 sera from patients wih monoclonal gammapathies (all isotypes). With Protein G affinity chromatography, RF/HCV IgG immune complexes and HCV core IgM antibodies displayed different binding characteristics, HCV core IgM appeared in the buffer eluate while HCV IgG/RF remained bound. With sucrose density gradient centrifugation HCV core IgM sedimented at 17-19S.