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J. Exp. Med.,
Volume 187, Number 9, May 4, 1998 1383-1393
By



From the * Institute of Experimental Immunology, CH-8091, Zürich, Switzerland; the This study describes the construction of soluble major histocompatibility complexes consisting
of the mouse class I molecule, H-2Db, chemically biotinylated
Molecular
Immunology Group, Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, OX39DU,
United Kingdom; and the § Biochemische Institut, 8057, Zürich, Switzerland
2 microglobulin and a peptide
epitope derived from the glycoprotein (GP; amino acids 33-41) of lymphocytic choriomeningitis virus (LCMV). Tetrameric class I complexes, which were produced by mixing the class I
complexes with phycoerythrin-labeled neutravidin, permitted direct analysis of virus-specific
cytotoxic T lymphocytes (CTLs) by flow cytometry. This technique was validated by (a) staining CD8+ cells in the spleens of transgenic mice that express a T cell receptor (TCR) specific
for H-2Db in association with peptide GP33-41, and (b) by staining virus-specific CTLs in the
cerebrospinal fluid of C57BL/6 (B6) mice that had been infected intracranially with LCMV-DOCILE. Staining of spleen cells isolated from B6 mice revealed that up to 40% of CD8+ T
cells were GP33 tetramer+ during the initial phase of LCMV infection. In contrast, GP33 tetramers did not stain CD8+ T cells isolated from the spleens of B6 mice that had been infected 2 mo previously with LCMV above the background levels found in naive mice. The fate of virus-specific CTLs was analyzed during the acute phase of infection in mice challenged both intracranially and intravenously with a high or low dose of LCMV-DOCILE. The results of the
study show that the outcome of infection by LCMV is determined by antigen load alone. Furthermore, the data indicate that deletion of virus-specific CTLs in the presence of excessive antigen is preceded by TCR downregulation and is dependent upon perforin.
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