Immunogenicity and efficacy of replication-competent recombinant influenza virus carrying multimeric M2 extracellular domains in a chimeric hemagglutinin conjugate.

Immunogenicity and efficacy of replication-competent recombinant influenza virus carrying multimeric M2 extracellular domains in a chimeric hemagglutinin conjugate.
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DOI:
10.1016/j.antiviral.2017.10.018
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发表时间:
2017-12
期刊:
影响因子:
7.6
通讯作者:
Kang SM
Kang SM
中科院分区:
医学2区
文献类型:
--
作者:
Kim MC;Lee YN;Kim YJ;Choi HJ;Kim KH;Lee YJ;Kang SM

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目前的流感疫苗提供血凝素 (HA) 毒株特异性保护。为了改善交叉保护,我们设计了具有复制能力的甲型流感病毒,以在嵌合 HA 中表达异源 M2 胞外 (M2e) 结构域的串联重复。通过电子显微镜检查,发现与 HA 糖蛋白 (M2e4x-HA) 缀合的 M2e 表位在可复制流感病毒的表面上表达。含有M2e4x-HA的重组流感病毒具有适度减毒作用,但在诱导M2e特异性抗体方面优于亲本病毒,且不影响HA免疫原性。重组流感病毒免疫小鼠比亲本病毒免疫小鼠表现出更好的交叉保护。接种表达 M2e4x-HA 的活重组流感病毒的小鼠的免疫血清可有效提供针对 H1、H3 和 H5 亚型流感病毒的保护。该研究表明,以HA嵌合形式表达保守保护性表位的重组流感病毒可以为提高流感疫苗的功效提供新途径。
Current influenza vaccines provide hemagglutinin (HA) strain-specific protection. To improve cross protection, we engineered replication-competent influenza A virus to express tandem repeats of heterologous M2 extracellular (M2e) domains in a chimeric HA. M2e epitopes conjugated to HA glycoproteins (M2e4x-HA) were found to be expressed on the surfaces of a replicable influenza virus as examined by electron microscopy. The recombinant influenza virus containing M2e4x-HA was moderately attenuated but superior to the parental virus in inducing M2e specific antibodies without compromising HA immunogenicity. Recombinant influenza virus immune mice showed better cross protection than parental virus immune mice. Immune sera from the mice with inoculation of live recombinant influenza virus expressing M2e4x-HA were effective in conferring protection against H1, H3, and H5 subtype influenza viruses. This study indicates that recombinant influenza virus expressing conserved protective epitopes in an HA chimeric form can provide a new approach for improving the efficacy of influenza vaccines.
人类感染新型禽源甲型流感 (H7N9) 病毒。
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