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Can Non-lytic CD8+ T Cells Drive HIV-1 Escape?

Journal Article · · PLoS Pathogens
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Imperial College, London (United Kingdom); DOE/OSTI
  2. Birkbeck University, London (United Kingdom)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Heidelberg University (Germany)
  4. University of Cambridge (United Kingdom)
  5. Eidgenoessische Technische Hochschule, Zurich (Switzerland)
  6. Imperial College, London (United Kingdom)

The CD8+ T cell effector mechanisms that mediate control of HIV-1 and SIV infections remain poorly understood. Recent work suggests that the mechanism may be primarily non-lytic. This is in apparent conflict with the observation that SIV and HIV-1 variants that escape CD8+ T cell surveillance are frequently selected. Whilst it is clear that a variant that has escaped a lytic response can have a fitness advantage compared to the wild-type, it is less obvious that this holds in the face of nonlytic control where both wild-type and variant infected cells would be affected by soluble factors. In particular, the high motility of T cells in lymphoid tissue would be expected to rapidly destroy local effects making selection of escape variants by non-lytic responses unlikely. The observation of frequent HIV-1 and SIV escape poses a number of questions. Most importantly, is the consistent observation of viral escape proof that HIV-1- and SIV-specific CD8+ T cells lyse infected cells or can this also be the result of non-lytic control? Additionally, the rate at which a variant strain escapes a lytic CD8+ T cell response is related to the strength of the response. Is the same relationship true for a non-lytic response? Finally, the potential anti-viral control mediated by non-lytic mechanisms compared to lytic mechanisms is unknown. These questions cannot be addressed with current experimental techniques nor with the standard mathematical models. Instead we have developed a 3D cellular automaton model of HIV-1 which captures spatial and temporal dynamics. The model reproduces in vivo HIV-1 dynamics at the cellular and population level. Using this model we demonstrate that non-lytic effector mechanisms can select for escape variants but that outgrowth of the variant is slower and less frequent than from a lytic response so that non-lytic responses can potentially offer more durable control.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Wellcome Trust; Medical Research Council (MRC)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1627908
Journal Information:
PLoS Pathogens, Journal Name: PLoS Pathogens Journal Issue: 11 Vol. 9; ISSN 1553-7374
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Differential Impact of In Vivo CD8 + T Lymphocyte Depletion in Controller versus Progressor Simian Immunodeficiency Virus-Infected Macaques journal June 2015
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