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Virus-induced delayed-type hypersensitivity reaction is sequentially mediated by CD8+ and CD4+ T lymphocytes
D Moskophidis1, F Lehmann-Grube
1Heinrich-Pette-Institut für Experimentelle Virologie und Immunologie an der Universität Hamburg, Hamburg 20, Federal Republic of Germany.
Summary
This study reveals that CD8+ T lymphocytes are crucial for clearing lymphocytic choriomeningitis virus (LCMV) infection and mediating the initial phase of the delayed-type hypersensitivity (DTH) response. CD4+ T cells contribute to the later DTH phase but have limited antiviral relevance.
Area of Science:
- Immunology
- Virology
- Cellular Biology
Background:
- Lymphocytic choriomeningitis virus (LCMV) infection in mice causes local viral multiplication and a delayed-type hypersensitivity (DTH) foot swelling reaction.
- The precise immune cells mediating both viral clearance and the DTH response in LCMV infection remain incompletely understood.
Purpose of the Study:
- To elucidate the roles of distinct T lymphocyte subsets in the local inflammatory response and viral clearance during LCMV infection.
- To determine whether the DTH reaction contributes to controlling LCMV replication.
Main Methods:
- Utilized "serologic surgery" (in vivo cell depletion via monoclonal antibodies) in mice.
- Employed adoptive immunization with negatively selected cells.
- Conducted adoptive immunization using cells from mice with differing major histocompatibility complex genes.
Main Results:
- The LCMV-induced DTH response involves two sequential phases mediated by T lymphocytes.
- The initial phase is driven by class I-restricted CD8+ cytotoxic/suppressive T lymphocytes.
- The second phase involves class II-restricted CD4+ helper/inducer T lymphocytes.
- Virus elimination primarily requires the CD8+ T lymphocyte subset.
Conclusions:
- CD8+ T lymphocytes are essential for both the early DTH response and LCMV clearance.
- CD4+ T lymphocytes mediate a later phase of the DTH response, but their role in controlling viral infection is questionable.
- Suggests a potential link between the CD8+ T cell-mediated DTH component and infection control, while the CD4+ T cell contribution appears less significant for antiviral defense.