Identification of a novel broadly HIV-1-neutralizing antibody from a CRF01_AE-infected Chinese donor.

Identification of a novel broadly HIV-1-neutralizing antibody from a CRF01_AE-infected Chinese donor.
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从感染 CRF01_AE 的中国捐赠者中鉴定出一种新型广泛 HIV-1 中和抗体

DOI:
10.1038/s41426-018-0175-1
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发表时间:
2018-11-01
影响因子:
13.2
通讯作者:
Shao Y
Shao Y
中科院分区:
医学2区
文献类型:
--
作者:
Ju B;Li D;Ren L;Hou J;Hao Y;Liang H;Wang S;Zhu J;Wei M;Shao Y

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从自然感染HIV-1的个体中分离和鉴定单克隆广泛中和抗体(nAbs)对于理解nAb对HIV-1感染的应答以及设计疫苗和治疗剂具有非常重要的作用。已经从感染HIV-1进化枝A、B、C等的个体中分离出许多广泛的nAb,但是,作为一种重要的重组病毒,在CRF 01_AE感染的个体中鉴定广泛的nAb仍然是困难的。在本研究中,我们使用抗原特异性单B细胞分选和单克隆抗体表达从CRF 01_AE感染的中国供体(GX 2016 EU 04)中分离单克隆抗体,这是一种基于对交叉进化枝病毒盘的中和活性的广谱中和剂。我们鉴定了一系列HIV-1单克隆交叉反应性nAb,称为F2、H6、BF 8、F4、F8、BE 7和F6。F6可中和37株HIV-1 Env假型病毒中的21株(57%),几何平均值为12.15 μg/ml。F6的重链和轻链来源于IGHV 4 -34和IGKV 2-28种系,互补决定区(CDR)3环分别由18和9个氨基酸组成,体细胞超突变(SHM)分别与其各自的种系基因有16.14%和11.83%的差异。F6为GP 120特异性nAb,识别线性表位。我们首次从CRF 01_AE感染的供体中鉴定出一种新的广泛中和HIV-1的抗体,称为F6,这可以丰富HIV-1 nAbs的研究,并为设计疫苗免疫原和基于抗体的治疗方法提供有用的见解。
The isolation and characterization of monoclonal broadly neutralizing antibodies (nAbs) from natural HIV-1-infected individuals play very important roles in understanding nAb responses to HIV-1 infection and designing vaccines and therapeutics. Many broadly nAbs have been isolated from individuals infected with HIV-1 clade A, B, C, etc., but, as an important recombinant virus, the identification of broadly nAbs in CRF01_AE-infected individuals remains elusive. In this study, we used antigen-specific single B-cell sorting and monoclonal antibody expression to isolate monoclonal antibodies from a CRF01_AE-infected Chinese donor (GX2016EU04), a broad neutralizer based on neutralizing activity against a cross-clade virus panel. We identified a series of HIV-1 monoclonal cross-reactive nAbs, termed F2, H6, BF8, F4, F8, BE7, and F6. F6 could neutralize 21 of 37 tested HIV-1 Env-pseudotyped viruses (57%) with a geometric mean value of 12.15 μg/ml. Heavy and light chains of F6 were derived from IGHV4-34 and IGKV 2-28 germlines, complementarity determining region (CDR) 3 loops were composed of 18 and 9 amino acids, and somatic hypermutations (SHMs) were 16.14% and 11.83% divergent from their respective germline genes. F6 was a GP120-specific nAb and recognized the linear epitope. We identified for the first time a novel broadly HIV-1-neutralizing antibody, termed F6, from a CRF01_AE-infected donor, which could enrich the research of HIV-1 nAbs and provide useful insights for designing vaccine immunogens and antibody-based therapeutics.
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