Journal
AIDS
Volume 29, Issue 1, Pages 23-33Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/QAD.0000000000000508
Keywords
acute HIV-1 infection; CD8(+) T cells; central CD8(+) T-cell memory responses; gag-specific responses; immune escape; persistent CD8(+) T-cell responses
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Funding
- NIH [R37AI067073]
- Bill and Melinda Gates Foundation
- South African Department of Science and Technology through the National Research Foundation
- International AIDS Vaccine Initiative
- Victor Daitz Chair in HIV/TB Research
- International Early Career Scientist Award from the Howard Hughes Medical Institute
- UNESCO/L'Oreal Corporate Foundation fellowship
- Technology Innovation Agency of the Department of Science and Technology of South Africa
- Mark and Lisa Schwartz Foundation
- Fogarty International Clinical Research Fellows award
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Objective: We characterized protein-specific CD8(+) T-cell immunodominance patterns during the first year of HIV-1 infection, and their impact on viral evolution and immune control. Methods: We analyzed CD8(+) T-cell responses to the full HIV-1 proteome during the first year of infection in 18 antiretroviral-naive individuals with acute HIV-1 subtype C infection, all identified prior to seroconversion. Ex-vivo and cultured interferon-gamma ELISPOT assays were performed and viruses from plasma were sequenced within defined CTL Gag epitopes. Results: Nef-specific CD8(+) T-cell responses were dominant during the first 4 weeks after infection and made up 40% of the total responses at this time; yet, by 1 year, responses against this region had declined and Gag responses made up to 47% of all T-cell responses measured. An inverse correlation between the breadth of Gag-specific responses and viral load set point was evident at 26 weeks after infection (P = 0.0081, r = -0.60) and beyond. An inverse correlation between the number of persistent responses targeting Gag and viral set point was also identified (P = 0.01, r = -0.58). Gag-specific responses detectable by the cultured ELISPOT assay correlated negatively with viral load set point (P = 0.0013, r = -0.91). Sequence evolution in targeted and nontargeted Gag epitopes in this cohort was infrequent. Conclusions: These data underscore the importance of HIV-specific CD8(+) T-cell responses, particularly to the Gag protein, in the maintenance of low viral load levels during primary infection, and show that these responses are initially poorly elicited by natural infection. These data have implications for vaccine design strategies. (C) 2014 Wolters Kluwer Health vertical bar Lippincott Williams & Wilkins
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