Department of Medicine.
Department of Molecular and Comparative Pathobiology, and.
J Clin Invest. 2023 Nov 1;133(21):e171097. doi: 10.1172/JCI171097.
BACKGROUNDHIV-1-infected CD4+ T cells contribute to latent reservoir persistence by proliferating while avoiding immune recognition. Integration features of intact proviruses in elite controllers (ECs) and people on long-term therapy suggest that proviruses in specific chromosomal locations can evade immune surveillance. However, direct evidence of this mechanism is missing.METHODSIn this case report, we characterized integration sites and full genome sequences of expanded T cell clones in an EC before and after chemoradiation. We identified the cognate peptide of infected clones to investigate cell proliferation and virus production induced by T cell activation, and susceptibility to autologous CD8+ T cells.RESULTSThe proviral landscape was dominated by 2 large clones with replication-competent proviruses integrated into zinc finger (ZNF) genes (ZNF470 and ZNF721) in locations previously associated with deeper latency. A third nearly intact provirus, with a stop codon in Pol, was integrated into an intergenic site. Upon stimulation with cognate Gag peptides, infected clones proliferated extensively and produced virus, but the provirus in ZNF721 was 200-fold less inducible. While autologous CD8+ T cells decreased the proliferation of cells carrying the intergenic provirus, they had no effect on cells with the provirus in the ZNF721 gene.CONCLUSIONSWe provide direct evidence that upon activation of infected clones by cognate antigen, the lower inducibility of intact proviruses in ZNF genes can result in immune evasion and persistence.FUNDINGOffice of the NIH Director and National Institute of Dental & Craniofacial Research; NIAID, NIH; Johns Hopkins University Center for AIDS Research.
HIV-1 感染的 CD4+T 细胞通过增殖而逃避免疫识别,从而有助于潜伏储库的持续存在。整合完整前病毒的特征在精英控制者(EC)和长期接受治疗的人群中表明,特定染色体位置的前病毒可以逃避免疫监测。然而,这种机制的直接证据尚缺乏。
在本病例报告中,我们在化疗和放疗前后,对一名 EC 中扩增的 T 细胞克隆的整合位点和全基因组序列进行了特征描述。我们鉴定了受感染克隆的同源肽,以研究 T 细胞激活诱导的细胞增殖和病毒产生,以及对自体 CD8+T 细胞的敏感性。
前病毒景观由 2 个大克隆主导,它们具有复制能力的前病毒整合到锌指(ZNF)基因(ZNF470 和 ZNF721)中,这些位置以前与更深的潜伏有关。第三个几乎完整的前病毒,其 Pol 中带有终止密码子,整合到一个基因间位点。在用同源 Gag 肽刺激后,受感染的克隆广泛增殖并产生病毒,但 ZNF721 中的前病毒诱导性低 200 倍。虽然自体 CD8+T 细胞降低了携带基因间前病毒的细胞的增殖,但对 ZNF721 基因中前病毒的细胞没有影响。
我们提供了直接证据表明,当受感染的克隆通过同源抗原被激活时,ZNF 基因中完整前病毒的低诱导性可导致免疫逃逸和持续存在。
美国国立卫生研究院主任办公室和国家牙科和颅面研究所;NIAID,NIH;约翰霍普金斯大学艾滋病研究中心。