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Original Article |
Correspondence to: Michael J. Bevan, Department of Immunology and Howard Hughes Medical Institute, School of Medicine, Box 357370, University of Washington, Seattle, WA 98195. Tel:206-685-3610 Fax:206-685-3612
Bone marrow (BM)-derived antigen-presenting cells (APCs) are potent stimulators of T cell immune responses. We investigated the requirements for antigen presentation by these cells in priming cytotoxic T lymphocyte (CTL) responses to intracellular bacterial and viral pathogens. [Parent
F1] radiation BM chimeras were constructed using C57BL/6 donors and (C57BL/6 x BALB/c)F1 recipients. Infection of chimeric mice with either Listeria monocytogenes or vaccinia virus expressing the nucleoprotein (NP) antigen from lymphocytic choriomeningitis virus (LCMV) primed H2-Dbrestricted, but not H2-Kdrestricted CTL responses, demonstrating the requirement for BM-derived APCs for successful priming of CTL responses to these pathogens. Surprisingly, this did not hold true for chimeric mice infected with LCMV itself. LCMV-infected animals developed strong CTL responses specific for both H2-Db and H2-Ldrestricted NP epitopes. These findings indicate that in vivo priming of CTL responses to LCMV is remarkably insensitive to deficiencies in antigen presentation by professional BM-derived APCs.
Key Words: cross-presentation, cytotoxic T cell, bacterial immunity, viral immunity, radiation chimera
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