Infants Infected with Respiratory Syncytial Virus Generate Potent Neutralizing Antibodies that Lack Somatic Hypermutation.

Infants Infected with Respiratory Syncytial Virus Generate Potent Neutralizing Antibodies that Lack Somatic Hypermutation.
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DOI:
10.1016/j.immuni.2018.01.005
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发表时间:
2018-02-20
期刊:
影响因子:
32.4
通讯作者:
Walker LM
Walker LM
中科院分区:
医学1区
文献类型:
--
作者:
Goodwin E;Gilman MSA;Wrapp D;Chen M;Ngwuta JO;Moin SM;Bai P;Sivasubramanian A;Connor RI;Wright PF;Graham BS;McLellan JS;Walker LM

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呼吸道合胞病毒(RSV)是导致婴儿死亡的主要原因,目前还没有获得许可的疫苗来保护这一脆弱人群。全面了解婴儿对天然RSV感染的抗体应答将有助于疫苗开发。在这里,我们从7名RSV感染的婴儿中分离出超过450种RSV融合糖蛋白(F)特异性抗体,发现一半的抗体仅识别两个抗原位点。靶向这两个位点的抗体显示出趋同的序列特征,结构研究揭示了它们识别RSV F的分子基础。靶向这些位点之一的抗体亚组显示出有效的中和活性,尽管缺乏体细胞突变,并且在RSV未处理的B细胞库中检测到类似的抗体,这表明使用适当设计的疫苗抗原可以在婴儿中扩增这些B细胞。总的来说,我们的研究结果提供了对婴儿抗体应答的基本见解,并为年龄特异性RSV疫苗的合理设计提供了框架。
Respiratory syncytial virus (RSV) is a leading cause of infant mortality, and there are currently no licensed vaccines to protect this vulnerable population. A comprehensive understanding of infant antibody responses to natural RSV infection would facilitate vaccine development. Here, we isolated over 450 RSV fusion glycoprotein (F)-specific antibodies from seven RSV-infected infants and found that half of the antibodies recognized only two antigenic sites. Antibodies targeting both sites showed convergent sequence features, and structural studies revealed the molecular basis for their recognition of RSV F. A subset of antibodies targeting one of these sites displayed potent neutralizing activity despite lacking somatic mutations, and similar antibodies were detected in RSV-naïve B cell repertoires, suggesting that expansion of these B cells in infants may be possible with suitably designed vaccine antigens. Collectively, our results provide fundamental insights into infant antibody responses and a framework for the rational design of age-specific RSV vaccines.
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