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Solid matrix-antibody-antigen complexes induce antigen-specific CD8+ cells that clear a persistent paramyxovirus
1Department of Biochemistry and Microbiology, University of St. Andrews, United Kingdom.
Journal of Virology
|February 1, 1991
Summary
Immunizing mice with solid matrix-antibody-antigen (SMAA) complexes induces CD8+ effector cells that clear simian virus 5 (SV5) infections. While less efficient than live virus, SMAA complexes offer a novel approach for inducing virus-clearing immune responses.
Area of Science:
- Immunology
- Virology
- Vaccine Development
Background:
- Adoptive transfer of splenocytes from simian virus 5 (SV5)-infected mice enhances viral clearance in immunodeficient mice, mediated by CD8+ effector cells.
- Serum neutralizing antibodies are less critical for SV5 clearance compared to cellular immune responses.
Purpose of the Study:
- To investigate if immunization with solid matrix-antibody-antigen (SMAA) complexes can induce CD8+ effector cells capable of clearing persistent SV5 infections.
- To compare the efficacy of SMAA complexes versus infectious SV5 in inducing cytotoxic T lymphocytes (CTLs) and in vivo viral clearance.
- To evaluate the role of the solid matrix material in SMAA complexes on immunogenicity.
Main Methods:
- Mice were immunized with SMAA complexes containing SV5 antigens or with live SV5.
- Splenocytes were isolated and assessed for CD8+ effector cell activity and in vitro cytotoxic T lymphocyte (CTL) responses.
- Viral clearance was measured in immunodeficient mice following adoptive transfer of splenocytes from immunized donors.
- Neutralizing antibody levels were quantified in mice immunized with SMAA complexes or live virus.
Main Results:
- Immunization with SMAA complexes induced CD8+ effector cells responsible for clearing SV5 in immunodeficient mice.
- SMAA complexes were less efficient than live SV5 in inducing in vitro CTLs and in vivo viral clearance, despite generating higher neutralizing antibody titers.
- Both Staphylococcus aureus Cowan strain A and alum served as effective solid matrices for SMAA complexes, indicating matrix material does not significantly alter immune response intensity.
Conclusions:
- Exogenous antigen immunization via SMAA complexes can induce class I-restricted CTLs, suggesting their role in in vivo virus clearance.
- While effective, SMAA complexes are less potent than live virus in inducing cellular immunity for viral clearance, but elicit stronger antibody responses.
- These findings have implications for vaccine design, highlighting the potential of SMAA complexes for inducing cellular immunity against viral infections.