T cell responses to an HLA-B*07-restricted epitope on the dengue NS3 protein correlate with disease severity
Center for Infectious Disease and Vaccine Research; Department of Medicine, Division of Infectious Diseases and Immunology
Adolescent; Child; Child, Preschool; Dengue; *Epitopes, T-Lymphocyte; HLA-B Antigens; Humans; Infant; Interleukin-2; Peptide Fragments; Prospective Studies; RNA Helicases; RNA, Viral; Serine Endopeptidases; T-Lymphocytes; Viral Nonstructural Proteins
Life Sciences | Medicine and Health Sciences
Dengue hemorrhagic fever (DHF), the severe manifestation of dengue virus (DV) infection characterized by plasma leakage, is more common in secondary DV infections in previously infected individuals and is associated with high levels of immune activation. To determine the Ag specificity of this immune response, we studied the response to an HLA-B*07-restricted T cell epitope, residues 221-232 of the DV NS3 protein, in 10 HLA-B*07(+) Thai children who were studied during and after acute DV infections. Peptide-specific T cells were detected in 9 of 10 subjects. The frequency of peptide-specific T cells was higher in subjects who had experienced DHF than in those who had experienced DF. We also detected peptide-specific T cells in PBMC obtained at the time of the acute DV infection in 2 of 5 subjects. These data suggest that the NS3 (221-232) epitope is an important target of CD8(+) T cells in secondary DV infection and that the activation and expansion of DV-specific T cells is greater in subjects with DHF than in those with dengue fever. These findings support the hypothesis that activation of DV-specific CD8(+) T cells plays an important role in the pathogenesis of DHF.
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Citation: J Immunol. 2002 Jun 1;168(11):5959-65.
Journal of immunology (Baltimore, Md. : 1950)
Zivna, Iva; Green, Sharone; Vaughn, David W.; Kalayanarooj, Siripen; Stephens, Henry A. F.; Chandanayingyong, Dasnayanee; Nisalak, Ananda; Ennis, Francis A.; and Rothman, Alan L., "T cell responses to an HLA-B*07-restricted epitope on the dengue NS3 protein correlate with disease severity" (2002). Open Access Articles. 1120.