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Related Experiment Videos

Complement-mediated cytolytic activity associated with cytomegalovirus complement-fixing IgM antibody.

J C Booth1, H S Mohammed

  • 1Department of Virology, St. George's Hospital Medical School, University of London, England.

Journal of Medical Virology
|March 1, 1988
PubMed
Summary

Cytomegalovirus-specific complement-fixing IgM (CMV CF-IgM) antibodies were found in 14.3% of sera. These antibodies, reacting with surface antigens, mediate complement-dependent cell lysis, unlike other CMV-specific IgM or IgG.

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Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Cytomegalovirus (CMV) infections are common and can cause significant morbidity, particularly in immunocompromised individuals.
  • Understanding the immune response to CMV is crucial for developing diagnostic tools and therapeutic strategies.
  • Immunoglobulin M (IgM) antibodies play a key role in the early stages of viral infections.

Purpose of the Study:

  • To investigate the characteristics of cytomegalovirus-specific complement-fixing IgM (CMV CF-IgM) antibodies.
  • To determine the antigenic targets and functional activity of CMV CF-IgM.
  • To compare the reactivity of CMV CF-IgM with other CMV-specific antibodies.

Main Methods:

  • Detection of CMV CF-IgM antibodies in human serum samples using complement fixation assays.

Related Experiment Videos

  • Comparison of antibody titres using purified viral antigens versus crude cell extracts.
  • Assessment of cytolytic activity mediated by different CMV-specific antibody classes.

    • Main Results:

    • CMV CF-IgM antibodies were detected in 14.3% of sera containing CMV-specific IgM.
    • Higher antibody titres were achieved with purified enveloped virus particles and membrane fragments compared to crude cell extracts.
    • The complement-fixing component of CMV IgM predominantly reacts with surface antigens of infected cells.
    • CMV CF-IgM demonstrated complement-mediated cytolytic activity, which was not observed with non-complement-fixing CMV IgM or CMV IgG.

    Conclusions:

    • CMV CF-IgM antibodies are present in a subset of individuals with CMV infection.
    • The surface antigens of CMV-infected cells are key targets for the complement-fixing activity of CMV IgM.
    • CMV CF-IgM plays a role in the complement-mediated lysis of infected cells, distinguishing it from other CMV-specific antibody types.