Immune selection for altered antigen processing leads to cytotoxic T lymphocyte escape in chronic HIV-1 infection.

Immune selection for altered antigen processing leads to cytotoxic T lymphocyte escape in chronic HIV-1 infection.
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在慢性 HIV-1 感染中,针对改变的抗原处理的免疫选择导致细胞毒性 T 淋巴细胞逃逸。

DOI:
10.1084/jem.20031982
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发表时间:
2004-04-05
影响因子:
15.3
通讯作者:
Goulder, PJR
Goulder, PJR
中科院分区:
医学1区
文献类型:
--
作者:
Draenert, R;Le Gall, S;Pfafferott, KJ;Leslie, AJ;Chetty, P;Brander, C;Holmes, EC;Chang, SC;Feeney, ME;Addo, MM;Ruiz, LD;Ramduth, D;Jeena, P;Altfeld, M;Thomas, S;Tang, TH;Verrill, CL;Dixon, C;Prado, JG;Kiepiela, P;Martinez-Picado, J;Walker, BD;Goulder, PJR

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细胞毒性T淋巴细胞(CTL)表位内的突变损害T细胞识别,但在改变抗原加工的侧翼区域中产生的逃逸突变尚未在自然人类感染中被定义。在人类组织相容性白细胞抗原(HLA)-B57+ HIV感染者中,免疫选择压力导致紧接在显性HLA-B57限制性表位ISPRTLNAW的NH 2末端之前的Gag残基146处从丙氨酸突变为脯氨酸。虽然N-延伸的野生型或突变肽仍然很好地识别,突变病毒感染的CD 4 T细胞未能被相同的CTL克隆识别。A146 P突变阻止了内质网氨肽酶I对最佳表位的NH 2-末端修剪。这些结果表明,CTL表位的侧翼区域内的等位基因相关序列变异可以改变抗原加工。鉴定此类突变在疫苗序列的构建中具有重要意义。
Mutations within cytotoxic T lymphocyte (CTL) epitopes impair T cell recognition, but escape mutations arising in flanking regions that alter antigen processing have not been defined in natural human infections. In human histocompatibility leukocyte antigen (HLA)-B57+ HIV-infected persons, immune selection pressure leads to a mutation from alanine to proline at Gag residue 146 immediately preceding the NH2 terminus of a dominant HLA-B57–restricted epitope, ISPRTLNAW. Although N-extended wild-type or mutant peptides remained well-recognized, mutant virus–infected CD4 T cells failed to be recognized by the same CTL clones. The A146P mutation prevented NH2-terminal trimming of the optimal epitope by the endoplasmic reticulum aminopeptidase I. These results demonstrate that allele-associated sequence variation within the flanking region of CTL epitopes can alter antigen processing. Identifying such mutations is of major relevance in the construction of vaccine sequences.
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