Mouse and human antibodies bind HLA-E-leader peptide complexes and enhance NK cell cytotoxicity.

Mouse and human antibodies bind HLA-E-leader peptide complexes and enhance NK cell cytotoxicity.
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DOI:
10.1038/s42003-022-03183-5
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发表时间:
2022-03-28
影响因子:
5.9
通讯作者:
Haynes BF
Haynes BF
中科院分区:
生物学2区
文献类型:
--
作者:
Li D;Brackenridge S;Walters LC;Swanson O;Harlos K;Rozbesky D;Cain DW;Wiehe K;Scearce RM;Barr M;Mu Z;Parks R;Quastel M;Edwards RJ;Wang Y;Rountree W;Saunders KO;Ferrari G;Borrow P;Jones EY;Alam SM;Azoitei ML;Gillespie GM;McMichael AJ;Haynes BF

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非经典Ib类分子人白细胞抗原E(HLA-E)具有有限的多态性,并且可以结合HLA Ia类前导肽(VL 9)。HLA-E-VL 9复合物与自然杀伤(NK)细胞受体NKG 2A-C/CD 94相互作用并调节NK细胞介导的细胞毒性。在这里,我们报告了3 H4的分离,3 H4是一种鼠HLA-E-VL 9特异性IgM抗体,可增强NKG 2A + NK细胞系对HLA-E-VL 9表达细胞的杀伤作用。结构分析表明,3 H4通过阻止CD 94/NKG 2A在HLA-E-VL 9上的对接而起作用。在体外成熟后,亲和力优化的IgG形式的3 H4显示出对表达HLA-E-VL 9的细胞的增强的NK杀伤。HLA-E-VL 9特异性IgM抗体在功能上与3 H4相似,也从巨细胞病毒(CMV)阴性的健康人的幼稚B细胞中分离。因此,从初始B细胞抗体库分离的靶向HLA-E-VL 9的小鼠和人抗体具有增强NK细胞细胞毒性的能力。HLA-E-VL 9靶向抗体的鉴定和结构分析,其阻断自然杀伤(NK)细胞受体途径并在体外调节NK功能。
The non-classical class Ib molecule human leukocyte antigen E (HLA-E) has limited polymorphism and can bind HLA class Ia leader peptides (VL9). HLA-E-VL9 complexes interact with the natural killer (NK) cell receptors NKG2A-C/CD94 and regulate NK cell-mediated cytotoxicity. Here we report the isolation of 3H4, a murine HLA-E-VL9-specific IgM antibody that enhances killing of HLA-E-VL9-expressing cells by an NKG2A+ NK cell line. Structural analysis reveal that 3H4 acts by preventing CD94/NKG2A docking on HLA-E-VL9. Upon in vitro maturation, an affinity-optimized IgG form of 3H4 showes enhanced NK killing of HLA-E-VL9-expressing cells. HLA-E-VL9-specific IgM antibodies similar in function to 3H4 are also isolated from naïve B cells of cytomegalovirus (CMV)-negative, healthy humans. Thus, HLA-E-VL9-targeting mouse and human antibodies isolated from the naïve B cell antibody pool have the capacity to enhance NK cell cytotoxicity. The identification and structural analysis of HLA-E-VL9-targeting antibodies that block a natural killer (NK) cell receptor pathway and regulate NK function in vitro.
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