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Rapid perturbation in viremia levels drives increases in functional avidity of HIV-specific CD8 T cells.

Abstract：

:The factors determining the functional avidity and its relationship with the broad heterogeneity of antiviral T cell responses remain partially understood. We investigated HIV-specific CD8 T cell responses in 85 patients with primary HIV infection (PHI) or chronic (progressive and non-progressive) infection. The functional avidity of HIV-specific CD8 T cells was not different between patients with progressive and non-progressive chronic infection. However, it was significantly lower in PHI patients at the time of diagnosis of acute infection and after control of virus replication following one year of successful antiretroviral therapy. High-avidity HIV-specific CD8 T cells expressed lower levels of CD27 and CD28 and were enriched in cells with an exhausted phenotype, i.e. co-expressing PD-1/2B4/CD160. Of note, a significant increase in the functional avidity of HIV-specific CD8 T cells occurred in early-treated PHI patients experiencing a virus rebound after spontaneous treatment interruption. This increase in functional avidity was associated with the accumulation of PD-1/2B4/CD160 positive cells, loss of polyfunctionality and increased TCR renewal. The increased TCR renewal may provide the mechanistic basis for the generation of high-avidity HIV-specific CD8 T cells. These results provide insights on the relationships between functional avidity, viremia, T-cell exhaustion and TCR renewal of antiviral CD8 T cell responses.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Viganò S,Bellutti Enders F,Miconnet I,Cellerai C,Savoye AL,Rozot V,Perreau M,Faouzi M,Ohmiti K,Cavassini M,Bart PA,Pantaleo G,Harari A

doi

10.1371/journal.ppat.1003423

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

e1003423

issue

7

eissn

1553-7366

issn

1553-7374

pii

PPATHOGENS-D-13-00128

journal_volume

9

pub_type

杂志文章

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