Attenuated Influenza Virions Expressing the SARS-CoV-2 Receptor-Binding Domain Induce Neutralizing Antibodies in Mice.

Attenuated Influenza Virions Expressing the SARS-CoV-2 Receptor-Binding Domain Induce Neutralizing Antibodies in Mice.
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DOI:
10.3390/v12090987
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发表时间:
2020-09-05
期刊:
Viruses
影响因子:
--
通讯作者:
Bloom JD
Bloom JD
中科院分区:
其他
文献类型:
--
作者:
Loes AN;Gentles LE;Greaney AJ;Crawford KHD;Bloom JD

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一种有效的疫苗对于控制SARS-CoV-2病毒的传播至关重要。在这里,我们描述了一种针对SARS-CoV-2的流感病毒疫苗。我们在一种流感病毒中加入了膜锚定形式的SARS-CoV-2刺突受体结合域(RBD),而不是神经氨酸酶(NA)编码序列,该病毒也具有一个突变,降低了血凝素与其唾液酸受体的亲和力。由此产生的ΔNA(RBD)-流感病毒可以通过反向遗传学产生,并在细胞培养中培养到高滴度。单剂鼻腔接种SARNA(RBD型流感)小鼠可诱导血清中和抗体效价,效价可与自然感染后在人中观察到的抗体效价相当(~1:2 0 0)。此外,ΔNA(RBD)-流感本身不会对小鼠造成明显的疾病。通过利用现有的流感疫苗生产平台,有可能大规模生产类似于ΔNA(RBD)-流感的疫苗。
An effective vaccine is essential for controlling the spread of the SARS-CoV-2 virus. Here, we describe an influenza virus-based vaccine for SARS-CoV-2. We incorporated a membrane-anchored form of the SARS-CoV-2 spike receptor binding domain (RBD) in place of the neuraminidase (NA) coding sequence in an influenza virus also possessing a mutation that reduces the affinity of hemagglutinin for its sialic acid receptor. The resulting ΔNA(RBD)-Flu virus can be generated by reverse genetics and grown to high titers in cell culture. A single-dose intranasal inoculation of mice with ΔNA(RBD)-Flu elicits serum neutralizing antibody titers against SAR-CoV-2 comparable to those observed in humans following natural infection (~1:200). Furthermore, ΔNA(RBD)-Flu itself causes no apparent disease in mice. It might be possible to produce a vaccine similar to ΔNA(RBD)-Flu at scale by leveraging existing platforms for the production of influenza vaccines.
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