Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/20112
Título: CD4+ recent thymic emigrants are infected by HIV in vivo, implication for pathogenesis
Autor: Fabre-Mersseman, Véronique
Dutrieux, Jacques
Louise, Anne
Rozlan, Sandra
Lamine, Aurélia
Parker, Raphaëlle
Rancez, Magali
Nunes-Cabaço, Helena
Sousa, Ana E.
Lambotte, Olivier
Cheynier, Rémi
Palavras-chave: HIV
HIV pathogenesis
HIV reservoir
Interleukin 7
Naive CD4+ T cells
Thymus
Data: 2011
Editora: Lippincott, Williams & Wilkins / Wolters Kluwer Health
Citação: AIDS 2011, 25:1153–1162
Resumo: OBJECTIVE: The contribution of naive CD4+ T cells to the pool of HIV-infected cells remains poorly described. This study aimed at evaluating HIV infection in naive T-cell subsets in viremic and HAART-treated patients, together with various parameters implicated in naive T-cell homeostasis, in order to better understand infection in these subsets. DESIGN AND METHODS: HIV provirus was quantified in various FACS-sorted CD4/CD8 T-cell subsets [recent thymic emigrants (RTEs), non-RTE naives and memory T cells] purified from peripheral blood cells of untreated viremic and HAART-treated aviremic HIV-infected patients. HIV proviral DNA was quantified using a highly sensitive real-time PCR assay allowing detection of one HIV copy in 10⁵ cells. Intrathymic precursor T-cell proliferation and circulating T-cell cycling were, respectively, evaluated through measurement of the sj/βTREC ratio (signal joint T-Cell Receptor Excision Circle frequency divided by DβJβTREC frequency) and Ki-67 expression. Plasma interleukin (IL)-7 concentrations were measured by ELISA. RESULTS: RTEs and non-RTEs were equally HIV infected. Altogether, naive CD4+ T cells represented 0.24%-60% of the infected cells. In contrast, HIV DNA was undetectable in naive CD8+ T cells. RTE infection rate directly correlated with IL-7 plasma levels (r = 0.607, P = 0.0035) but was independent from plasma viral load, peripheral T-cell cycling and intrathymic precursor T-cell proliferation. CONCLUSION: We demonstrated that RTEs are effectively HIV infected. The similar infection rate observed in RTEs and other naive T cells, its relationship with plasma IL-7 levels, together with the lack of correlation between RTE infection and either thymic or peripheral proliferation, strongly suggests that RTE infection occurs either late during thymopoiesis or early on during their extrathymic maturation.
Descrição: © 2011 Wolters Kluwer Health | Lippincott Williams & Wilkins
Peer review: yes
URI: http://dx.doi.org/10.1097/QAD.0b013e3283471e89
http://hdl.handle.net/10451/20112
ISSN: 0269-9370
Versão do Editor: The definitive version is available at http://journals.lww.com/aidsonline/pages/default.aspx
Aparece nas colecções:FM-LIC - Artigos em Revistas Internacionais
IMM - Artigos em Revistas Internacionais

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