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Antibody responses to synthetic peptides from cytomegalovirus phosphoprotein 150
V A Sundqvist1, W Xu, B Wahren
1Department of Medical Laboratory Technology, Stockholm College of Health and Caring Sciences, Sweden.
Abstract:
We have identified antigenic regions within phosphoprotein 150 of human cytomegalovirus (CMV pp150) to which seroreactivity appears in patients with active CMV infection or persists in seropositive persons. A range of 8.3 to 61.6% of healthy CMV-seropositive blood donors were immunoglobulin G positive for single peptides, while 91.6% reacted to a mixture of four peptides. All convalescent-phase serum samples from 26 patients with active CMV infection reacted with either of two peptides encompassing amino acids (aa) 594 to 623 and aa 614 to 643. Patients with a primary CMV infection had patterns of reactivity to single peptides different from those of patients with reactivated CMV infection. The immunoglobulin M antibodies reacted preferentially with the peptides encompassing aa 594 to 663 of CMV pp150.
Insights
Researchers identified key antigenic regions in human cytomegalovirus phosphoprotein 150 (CMV pp150). These regions are recognized by antibodies in active or persistent cytomegalovirus infections, aiding in diagnosis.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Human cytomegalovirus (CMV) is a common pathogen with significant implications for immunocompromised individuals.
- Effective diagnostic tools for CMV infection rely on detecting host immune responses, particularly antibody profiles.
- Phosphoprotein 150 (pp150) is a major structural component of CMV, making it a potential target for immune detection.
Purpose of the Study:
- To identify specific antigenic regions within CMV pp150 that elicit serological responses.
- To differentiate immune reactivity patterns associated with primary versus reactivated CMV infections.
- To assess the diagnostic potential of identified pp150 epitopes for CMV infection.
Main Methods:
- Peptide mapping of CMV pp150 to identify immunogenic epitopes.
- Serological assays (ELISA) using immunoglobulin G (IgG) and immunoglobulin M (IgM) to detect antibody reactivity against pp150 peptides.
- Analysis of serum samples from healthy CMV-seropositive donors and patients with active, primary, or reactivated CMV infections.
Main Results:
- A significant proportion of healthy CMV-seropositive individuals showed IgG reactivity to specific pp150 peptides, with high reactivity to a mixture of four peptides (91.6%).
- All serum samples from patients with active CMV infection recognized peptides spanning amino acids (aa) 594–623 and aa 614–643.
- Distinct patterns of peptide reactivity were observed between patients with primary and reactivated CMV infections, and IgM antibodies preferentially targeted aa 594–663.
Conclusions:
- Specific antigenic regions within CMV pp150 are crucial targets for antibody detection in active and persistent CMV infections.
- The identified pp150 epitopes demonstrate potential for differentiating between primary and reactivated CMV infections.
- These findings contribute to the development of improved diagnostic strategies for human cytomegalovirus.