CD4+ T cells from HIV-1-infected patients recognize wild-type and mutant human immunodeficiency virus-1 protease epitopes.

CD4+ T cells from HIV-1-infected patients recognize wild-type and mutant human immunodeficiency virus-1 protease epitopes.
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HIV-1 感染患者的 CD4 T 细胞可识别野生型和突变型人类免疫缺陷病毒 1 蛋白酶表位。

DOI:
10.1111/j.1365-2249.2011.04319.x
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发表时间:
2011
影响因子:
4.6
通讯作者:
Moraes,SL
Moraes,SL
中科院分区:
医学3区
文献类型:
--
作者:
Muller,NG;Alencar,R;Jamal,L;Hammer,J;Sidney,J;Sette,A;Brindeiro,RM;Kalil,J;Cunha-Neto,E;Moraes,SL

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人类免疫缺陷病毒(HIV)-1蛋白酶是已知的CD 8 T细胞应答的靶点,但它是迄今为止唯一没有完全鉴定出HIV-1蛋白酶CD 4表位的HIV-1蛋白。我们使用基于5,6-羧基荧光素二乙酸琥珀酰亚胺酯的增殖试验,研究了来自75名HIV-1感染、蛋白酶抑制剂(PI)治疗患者的CD 4 T细胞对HIV-1蛋白酶的识别。为了鉴定推定的混杂CD 4 T细胞表位,我们使用TEPITOPE算法扫描HXB 2 HIV-1蛋白酶的序列。鉴定了蛋白酶区域4-23、45-64和73-95;还检测了上述区域的32种序列变体,编码频繁的PI诱导的突变和多态性。平均而言,每种肽与15种测试的常见人类白细胞抗原D相关(HLA-DR)分子中的5种结合。超过80%的患者显示出至少一种蛋白酶肽的CD 4以及CD 8 T细胞识别。所有35种肽均被识别。这种反应与特定的HLA-DR或-DQ等位基因无关。因此,我们的研究结果表明,蛋白酶是CD 4沿着CD 8增殖性T细胞应答的常见靶标,大多数接受PI治疗的HIV-1感染患者都有这种应答。对相同肽的匹配的CD 4和CD 8 T细胞应答的频繁发现可能表明CD 4 T细胞为维持长寿命蛋白酶特异性功能性CD 8 T细胞提供同源T细胞帮助。
Abstract Human immunodeficiency virus (HIV)-1 protease is a known target of CD8 T cell responses, but it is the only HIV-1 protein in which no fully characterized HIV-1 protease CD4 epitopes have been identified to date. We investigated the recognition of HIV-1 protease by CD4 T cells from 75 HIV-1-infected, protease inhibitor (PI)-treated patients, using the 5, 6-carboxyfluorescein diacetate succinimidyl ester-based proliferation assay. In order to identify putative promiscuous CD4 T cell epitopes, we used the TEPITOPE algorithm to scan the sequence of the HXB2 HIV-1 protease. Protease regions 4-23, 45-64 and 73-95 were identified; 32 sequence variants of the mentioned regions, encoding frequent PI-induced mutations and polymorphisms, were also tested. On average, each peptide bound to five of 15 tested common human leucocyte antigen D-related (HLA-DR) molecules. More than 80% of the patients displayed CD4 as well as CD8 T cell recognition of at least one of the protease peptides. All 35 peptides were recognized. The response was not associated with particular HLA-DR or-DQ alleles. Our results thus indicate that protease is a frequent target of CD4 along with CD8 proliferative T cell responses by the majority of HIV-1-infected patients under PI therapy. The frequent finding of matching CD4 and CD8 T cell responses to the same peptides may indicate that CD4 T cells provide cognate T cell help for the maintenance of long-living protease-specific functional CD8 T cells.
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