Linked Life Data

11298336

Source:http://linkedlifedata.com/resource/pubmed/id/11298336

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pubmed-article:11298336pubmed:abstractTextTherapeutic intervention with antiretroviral therapy (ART) enables the modulation of HIV virus load and hence provides a unique opportunity to study the consequences of varying antigen load on the phenotype of virus-specific CD8(+) T lymphocytes in a persistent human viral infection. The recent advent of tetrameric peptide / HLA class I complexes has enabled the direct phenotypic characterization of antigen-specific T cell populations ex vivo. Here, we use this technology to examine directly ex vivo the consequences of therapeutic manipulation of HIV virus load on the phenotype of HIV-specific CTL. Our observations show that: (1) distinct sequential activation patterns of CD8(+) T cells are associated with increasing virus load; (2) T cell receptor (TCR) down-regulation without apoptosis represents an early event during the generation of a T cell response in a natural infection and precedes the emergence of two distinct antigen-specific CD8(+) T cell populations which differ in TCR and CD8 expression levels. Clear differences in surface Annexin V staining were observed between these populations. The observation that CTL activation, demonstrated by TCR and CD8 down-regulation, in response to rising levels of virus load, co-segregates with apoptosis only during later stages of the response indicates that antigen-associated cell death is restricted to distinct subpopulations of CTL.lld:pubmed
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pubmed-article:11298336pubmed:authorpubmed-author:WeberJ NJNlld:pubmed
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pubmed-article:11298336pubmed:volume31lld:pubmed
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pubmed-article:11298336pubmed:pagination1115-21lld:pubmed
pubmed-article:11298336pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:11298336pubmed:year2001lld:pubmed
pubmed-article:11298336pubmed:articleTitleDirect ex vivo analysis reveals distinct phenotypic patterns of HIV-specific CD8(+) T lymphocyte activation in response to therapeutic manipulation of virus load.lld:pubmed
pubmed-article:11298336pubmed:affiliationNuffield Department of Medicine, John Radcliffe Hospital, Oxford, Great Britain. annette.oxenius@ndm.ox.ac.uklld:pubmed
pubmed-article:11298336pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11298336pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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