Broad cross protection by recombinant live attenuated influenza H3N2 seasonal virus expressing conserved M2 extracellular domain in a chimeric hemagglutinin.

Broad cross protection by recombinant live attenuated influenza H3N2 seasonal virus expressing conserved M2 extracellular domain in a chimeric hemagglutinin.
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DOI:
10.1038/s41598-021-83704-0
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发表时间:
2021-02-18
期刊:
影响因子:
4.6
通讯作者:
Kang SM
Kang SM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Park BR;Kim KH;Kotomina T;Kim MC;Kwon YM;Jeeva S;Jung YJ;Bhatnagar N;Isakova-Sivak I;Mezhenskaya D;Rudenko L;Wang BZ;Kang SM

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目前基于血凝素 (HA) 的疫苗提供的交叉保护效果欠佳。甲型流感病毒含有离子通道蛋白 M2 保守胞外结构域 (M2e),这是开发通用疫苗的目标。在这里,我们生成了重配流感病毒 rgH3N2 4xM2e 病毒(HA 和 NA 来自 A/Switzerland/9715293/2013/(H3N2)),表达嵌合 4xM2e-HA 融合蛋白,其中 4xM2e 表位插入 H3 HA N 末端。重组 rgH3N2 4xM2e 病毒被发现在鸡蛋底物中保留与 rgH3N2 相同的生长动力学。小鼠鼻内单次接种活 rgH3N2 4xM2e 病毒可有效引发粘膜和全身部位 M2e 特异性 IgG 抗体反应以及 T 细胞反应的诱导。 rgH3N2 4xM2e 引发的小鼠能够抵抗多种不同的甲型流感病毒亚型,包括 H1N1、H3N2、H5N1、H7N9 和 H9N2。这些发现支持一种通过重组流感病毒诱导对 HA 和交叉保护性 M2e 抗原的免疫力来提高当前疫苗平台功效的新方法。
Hemagglutinin (HA)-based current vaccines provide suboptimum cross protection. Influenza A virus contains an ion channel protein M2 conserved extracellular domain (M2e), a target for developing universal vaccines. Here we generated reassortant influenza virus rgH3N2 4xM2e virus (HA and NA from A/Switzerland/9715293/2013/(H3N2)) expressing chimeric 4xM2e-HA fusion proteins with 4xM2e epitopes inserted into the H3 HA N-terminus. Recombinant rgH3N2 4xM2e virus was found to retain equivalent growth kinetics as rgH3N2 in egg substrates. Intranasal single inoculation of mice with live rgH3N2 4xM2e virus was effective in priming the induction of M2e specific IgG antibody responses in mucosal and systemic sites as well as T cell responses. The rgH3N2 4xM2e primed mice were protected against a broad range of different influenza A virus subtypes including H1N1, H3N2, H5N1, H7N9, and H9N2. The findings support a new approach to improve the efficacy of current vaccine platforms by recombinant influenza virus inducing immunity to HA and cross protective M2e antigens.
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