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Differential in vivo clearance and response to secondary heterologous infections by H2(b)-restricted dengue virus-specific CD8+ T cells.
- Source :
-
Viral immunology [Viral Immunol] 2010 Oct; Vol. 23 (5), pp. 477-85. - Publication Year :
- 2010
-
Abstract
- Cytotoxic T lymphocytes (CTL) are hypothesized to play a role in clearance during primary dengue virus (DENV) infections, and contribute to immunopathology during secondary heterologous infections in humans. We previously reported skewed T-cell responses to secondary DENV infection in BALB/c (H-2(d)) mice, reproducing characteristics of human DENV infection. To set the stage for using widely available transgenic and knockout mice, we extended these studies to identify DENV-specific T-cell responses in C57BL/6 (H-2(b)) mice. We identified dominant CD8+ T-cell responses to H-2D(b)-restricted epitopes on the DENV NS4a (aa 249-265) and NS5 (aa 521-537) proteins. High frequencies of IFN-γ- and TNF-α-producing T cells directed at both epitopes were detected following primary infection with all four DENV serotypes, and were augmented by secondary DENV infections. In vivo cytotoxicity assays demonstrated rapid clearance of target cells pulsed with the NS4a peptide; in contrast, NS5 peptide-pulsed target cells were poorly cleared in vivo. These data characterize two H-2(b)-restricted T-cell epitopes displaying divergent in vivo function. These results should facilitate further studies of the in vivo effects of DENV-specific T cells, including the use of genetically modified mouse strains.
- Subjects :
- Animals
Cytotoxicity Tests, Immunologic
Epitopes, T-Lymphocyte immunology
H-2 Antigens immunology
Histocompatibility Antigen H-2D
Interferon-gamma metabolism
Mice
Mice, Inbred C57BL
Tumor Necrosis Factor-alpha metabolism
Viral Nonstructural Proteins immunology
CD8-Positive T-Lymphocytes immunology
Dengue immunology
Dengue Virus immunology
T-Lymphocytes, Cytotoxic immunology
Subjects
Details
- Language :
- English
- ISSN :
- 1557-8976
- Volume :
- 23
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Viral immunology
- Publication Type :
- Academic Journal
- Accession number :
- 20883162
- Full Text :
- https://doi.org/10.1089/vim.2010.0034