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Laboratories of
*
Immunoregulation and
Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892;
Science Applications International Corp., Frederick Cancer Research and Development Center, Frederick, MD 21702;
§
Emory University Vaccine Center at Yerkes, Atlanta, GA 30322; and
¶
Servicio de Medicina Interna 1, Clinica Puerta de Hierro, Universidad Autonoma de Madrid, and Servicio de Microbiologia, Hospital General Gregorio Maranon, Madrid, Spain
The virus-specific CD8+ T cell responses of 21
HIV-infected patients were studied including a unique cohort of
long-term nonprogressors with low levels of plasma viral RNA and strong
proliferative responses to HIV Ags. HIV-specific CD8+ T
cell responses were studied by a combination of standard cytotoxic T
cell (CTL) assays, MHC tetramers, and TCR repertoire analysis. The
frequencies of CD8+ T cells specific to the majority of HIV
gene products were measured by flow cytometric detection of
intracellular IFN-
in response to HIV-vaccinia recombinant-infected
autologous B cells. Very high frequencies (0.818.0%) of circulating
CD8+ T cells were found to be HIV specific. High
frequencies of HIV-specific CD8+ T cells were not limited
to long-tern nonprogressors with restriction of plasma virus. No
correlation was found between the frequency of HIV-specific
CD8+ T cells and levels of plasma viremia. In each case,
the vast majority of cells (up to 17.2%) responded to
gag-pol. Repertoire analysis showed these large numbers
of Ag-specific cells were scattered throughout the repertoire and in
the majority of cases not contained within large monoclonal expansions.
These data demonstrate that high numbers of HIV-specific
CD8+ T cells exist even in patients with high-level viremia
and progressive disease. Further, they suggest that other qualitative
parameters of the CD8+ T cell response may differentiate
some patients with very low levels of plasma virus and nonprogressive
disease.
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G. Chen, P. Shankar, C. Lange, H. Valdez, P. R. Skolnik, L. Wu, N. Manjunath, and J. Lieberman CD8 T cells specific for human immunodeficiency virus, Epstein-Barr virus, and cytomegalovirus lack molecules for homing to lymphoid sites of infection Blood, July 1, 2001; 98(1): 156 - 164. [Abstract] [Full Text] [PDF] |
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T. U. Vogel, T. M. Allen, J. D. Altman, and D. I. Watkins Functional Impairment of Simian Immunodeficiency Virus-Specific CD8+ T Cells during the Chronic Phase of Infection J. Virol., March 1, 2001; 75(5): 2458 - 2461. [Abstract] [Full Text] |
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P. A. Goepfert, A. Bansal, B. H. Edwards, G. D. Ritter Jr., I. Tellez, S. A. McPherson, S. Sabbaj, and M. J. Mulligan A Significant Number of Human Immunodeficiency Virus Epitope-Specific Cytotoxic T Lymphocytes Detected by Tetramer Binding Do Not Produce Gamma Interferon J. Virol., November 1, 2000; 74(21): 10249 - 10255. [Abstract] [Full Text] |
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M. Dybul, T.-W. Chun, C. Yoder, B. Hidalgo, M. Belson, K. Hertogs, B. Larder, R. L. Dewar, C. H. Fox, C. W. Hallahan, et al. Short-cycle structured intermittent treatment of chronic HIV infection with highly active antiretroviral therapy: Effects on virologic, immunologic, and toxicity parameters PNAS, December 18, 2001; 98(26): 15161 - 15166. [Abstract] [Full Text] [PDF] |
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