Department of Paediatrics, University of Oxford, Oxford, United Kingdom.
J Virol. 2013 Oct;87(19):10889-94. doi: 10.1128/JVI.01122-13. Epub 2013 Jul 17.
HLA-B57 is strongly associated with immune control of HIV and delayed AIDS progression. The closely related, but less protective, HLA-B58:01 presents similar epitopes, but HLA-B58:01(+) individuals do not generate CD8(+) T cells targeting the KF11-Gag epitope, which has been linked to low viremia. Here we show that HLA-B58:01 binds and presents KF11 peptide, but HIV-infected HLA-B*58:01(+) cells fail to process KF11. This unexpected finding demonstrates that immunodominance patterns can be influenced by intracellular events independent of HLA binding motifs.
HLA-B57 与 HIV 的免疫控制和艾滋病的延迟进展密切相关。密切相关但保护作用较弱的 HLA-B58:01 呈现出相似的表位,但 HLA-B58:01(+)个体不能产生针对 KF11-Gag 表位的 CD8(+)T 细胞,而 KF11-Gag 表位与低病毒血症有关。在这里,我们表明 HLA-B58:01 结合并呈递 KF11 肽,但感染 HIV 的 HLA-B*58:01(+)细胞不能加工 KF11。这一意外发现表明,免疫优势模式可以受到与 HLA 结合基序无关的细胞内事件的影响。