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Cell membrane-associated measles virus components inhibit antigen processing
J Marttila1, A Hinkkanen, T Ziegler
1Department of Virology, Turku Immunology Centre, University of Turku, Finland. jane.marttila@utu.fi
Abstract:
Measles virus (MV)-induced immune suppression is an important reason for MV-associated mortality and morbidity. Despite numerous studies, the mechanisms of immune suppression still remain poorly defined. In the present study we analyzed the effect of MV components on the T-cell recognition of specific non-MV antigens. We demonstrated that even inactivated MV could inhibit the presentation of unprocessed protein antigen to specific T cells, whereas MV did not affect the responses of specific T cells to representative synthetic peptide epitopes derived from complex antigens. The inhibition was induced by MV-infected cell membranes. The kinetics of the MV-dependent inhibition suggested an impaired antigen processing in mononuclear cells as addition of MV-infected cell debris 4 h after the beginning of cell cultures no longer inhibited T-cell responsiveness.
Insights
Measles virus (MV) infection impairs the immune system by inhibiting antigen processing in mononuclear cells. This effect, mediated by infected cell membranes, hinders T-cell recognition of unprocessed antigens, contributing to measles severity.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Measles virus (MV) causes significant mortality and morbidity due to immune suppression.
- The precise mechanisms underlying MV-induced immune suppression remain largely undefined.
- Understanding these mechanisms is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the impact of MV components on T-cell recognition of specific non-MV antigens.
- To elucidate the role of MV-infected cell membranes in immune modulation.
- To determine the effect of MV on antigen processing pathways.
Main Methods:
- Analysis of T-cell responses to specific non-MV antigens in the presence of MV components.
- Utilizing inactivated MV and MV-infected cell membranes for experimental manipulation.
- Investigating the kinetics of MV-dependent inhibition by varying the timing of cell debris addition.
Main Results:
- Inactivated MV inhibited the presentation of unprocessed protein antigens to T cells.
- MV did not affect T-cell responses to synthetic peptide epitopes.
- MV-infected cell membranes were identified as the mediator of inhibition.
- Inhibition was dependent on antigen processing, as delayed addition of infected cell debris reduced the effect.
Conclusions:
- Measles virus impairs T-cell recognition primarily by interfering with antigen processing.
- MV-infected cell membranes play a key role in mediating this immune suppression.
- The findings highlight a specific mechanism by which MV compromises cellular immunity.