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HIV-specific CD4+ T helper lymphocytes are preferred targets for infection. Although complete interruption of combination antiretroviral therapy (ART) can form part of therapeutic manipulations, there is grave concern that the resumption of viral replication might destroy, perhaps irreversibly, these T helper populations. High viremia blocks the proliferation capacity of HIV-specific helper cells. However, cytokine production assays imply that some antigen-specific effector function is retained. Despite this careful work, it remains unclear whether the return of HIV-1 replication physically destroys HIV-1-specific T helper cells in the peripheral blood. Difficulties in producing stable peptide-MHC class II complexes and the very low frequencies of antigen-specific CD4+ T cells have delayed the application of this powerful technique. Here we employ HLA class II tetramers and validate a sensitive, quantitative cell-enrichment technique to detect HIV-1 T helper cells. We studied patients with early-stage HIV infection who were given a short, fixed course of ART as part of a clinical study. We did not find significant deletion of these cells from the peripheral circulation when ART was stopped and unfettered HIV replication returned. The turnover of these virus-specific cells increased and they adopted an effector phenotype when viremia returned.

Original publication

DOI

10.1172/jci200523084

Type

Journal article

Journal

The Journal of clinical investigation

Publication Date

02/2005

Volume

115

Pages

443 - 450

Addresses

Peter Medawar Building for Pathogen Research and Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom.

Keywords

T-Lymphocytes, Helper-Inducer, Cells, Cultured, Humans, HIV-1, Viremia, HIV Infections, Histocompatibility Antigens Class II, Antiretroviral Therapy, Highly Active, Lymphocyte Activation, Virus Activation, Cell Proliferation