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The Journal of Immunology, Vol 154, Issue 3 1287-1295, Copyright © 1995 by American Association of Immunologists
ARTICLES |
PG Livingston, I Kurane, LC Dai, Y Okamoto, CJ Lai, R Men, S Karaki, M Takiguchi and FA Ennis
Department of Medicine, University of Massachusetts Medical Center, Worcester 01655.
Dengue virus infections are a major cause of morbidity and mortality in tropical and subtropical areas of the world. We analyzed dengue virus- specific CD8+ CD4- CTL at the clonal level to further understand the role of CD8+ CTL in dengue virus infections. Dengue virus-specific CD8+ CTL clones were established from lymphocytes of a dengue 4-immune adult. Three patterns of dengue serotype specificities were identified: 1) specific for dengue 4, 2) cross-reactive for dengue 2 and dengue 4 (subcomplex-specific); and 3) cross-reactive for all four dengue virus serotypes. Three dengue 4-specific clones and one dengue 2/dengue 4 cross-reactive clone were further analyzed. All four of the clones were HLA-B35 restricted and recognized NS3. The epitopes were mapped to amino acids (aa) 483 to 618 of NS3. The epitope was then defined by using synthetic peptides. Three dengue 4-specific clones and one dengue 2/dengue 4 cross-reactive clone recognized the same peptide (TPEGIIPTL) encompassing aa 500 to 508 of dengue 4 NS3. The peptide encompassing aa 500-508 of dengue 2 NS3 was recognized by a dengue 2/dengue 4 cross- reactive clone but was not recognized by the dengue 4-specific clones. Dengue 4-specific and dengue 2/dengue 4 cross-reactive clones used different TCR. These results indicate that CD8+ CTL clones that use different TCR and demonstrate two distinct serotype specificities recognize the same 9-mer peptide in the context of HLA-B35.
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