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Chronic infections in mice can result in defects in memory CD8 T cell properties including low expression of the IL-7Ralpha (CD127). To determine whether defects in memory CD8 T cell formation exist during human chronic infections and to what extent these defects may be allele- or epitope-specific, we compared influenza (Flu), vaccinia (VV) and EBV-specific CD8 T cells to HIV-specific CD8 T cells, using a panel of 13 HIV tetramers. Compared to Flu, VV or EBV, HIV tetramer+ CD8 T cells expressed significantly lower levels of CD127, and this reduction was pervasive across all epitopes and alleles tested and over a wide range of viral loads and CD4 counts. These results indicate impaired HIV-specific memory CD8 T cell differentiation, regardless of level of control of viremia, epitopes targeted or restricting HLA alleles.

Original publication

DOI

10.1016/j.virol.2006.06.017

Type

Journal article

Journal

Virology

Publication Date

30/09/2006

Volume

353

Pages

366 - 373

Keywords

Africa, Alleles, CD8-Positive T-Lymphocytes, Chronic Disease, HIV Infections, HLA Antigens, Humans, Immunologic Memory, Lymphocyte Count, Receptors, Interleukin-7, United States, Viral Load