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DESIGN: Antiretroviral therapy (ART) currently represents the best way to avert the lethal consequences of chronic persistent HIV-1 infection. It leads to significant reductions of plasma viremia, often to undetectable levels, but it can also be linked with the reduction and disappearance of detectable HIV-specific CD8 T-cell responses. RESULTS: Here we describe a group of patients in whom ongoing replication of HIV, particularly transcription of Nef mRNA species, was detected despite prolonged and clinically successful antiretroviral treatment. Modest, but significant, numbers of HIV-specific CD8 T cells and CD4 T-cell responses were found in these subjects, with the strongest responses directed towards Nef epitopes. Detailed phenotypic analysis of the HIV-specific CD8 cells demonstrated low perforin levels and persistent expression of CD27, a phenotype associated with incomplete differentiation of cytotoxic T lymphocytes (CTL). CONCLUSION: This immature CTL phenotype has been described previously in association with chronic HIV disease, but its continued persistence is surprising in the setting of prolonged viral suppression on therapy and the presence of HIV-specific CD4 cell activity.

Type

Journal article

Journal

AIDS

Publication Date

25/01/2002

Volume

16

Pages

161 - 170

Keywords

Anti-HIV Agents, Antiretroviral Therapy, Highly Active, CD28 Antigens, CD4-Positive T-Lymphocytes, CD8-Positive T-Lymphocytes, Cohort Studies, HIV Antigens, HIV Infections, HIV Protease Inhibitors, HIV-1, Humans, Immunophenotyping, Indinavir, Interferon-gamma, Lamivudine, Membrane Glycoproteins, Palatine Tonsil, Perforin, Pore Forming Cytotoxic Proteins, RNA, Viral, Reverse Transcriptase Inhibitors, Time Factors, Treatment Outcome