EBioMedicine (Jan 2022)

Nasal prevention of SARS-CoV-2 infection by intranasal influenza-based boost vaccination in mouse models

  • Runhong Zhou,
  • Pui Wang,
  • Yik-Chun Wong,
  • Haoran Xu,
  • Siu-Ying Lau,
  • Li Liu,
  • Bobo Wing-Yee Mok,
  • Qiaoli Peng,
  • Na Liu,
  • Kin-Fai Woo,
  • Shaofeng Deng,
  • Rachel Chun-Yee Tam,
  • Haode Huang,
  • Anna Jinxia Zhang,
  • Dongyan Zhou,
  • Biao Zhou,
  • Chun-Yin Chan,
  • Zhenglong Du,
  • Dawei Yang,
  • Ka-Kit Au,
  • Kwok-Yung Yuen,
  • Honglin Chen,
  • Zhiwei Chen

Journal volume & issue
Vol. 75
p. 103762

Abstract

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Summary: Background: Vaccines in emergency use are efficacious against COVID-19, yet vaccine-induced prevention against nasal SARS-CoV-2 infection remains suboptimal. Methods: Since mucosal immunity is critical for nasal prevention, we investigated the efficacy of an intramuscular PD1-based receptor-binding domain (RBD) DNA vaccine (PD1-RBD-DNA) and intranasal live attenuated influenza-based vaccines (LAIV-CA4-RBD and LAIV-HK68-RBD) against SARS-CoV-2. Findings: Substantially higher systemic and mucosal immune responses, including bronchoalveolar lavage IgA/IgG and lung polyfunctional memory CD8 T cells, were induced by the heterologous PD1-RBD-DNA/LAIV-HK68-RBD as compared with other regimens. When vaccinated animals were challenged at the memory phase, prevention of robust SARS-CoV-2 infection in nasal turbinate was achieved primarily by the heterologous regimen besides consistent protection in lungs. The regimen-induced antibodies cross-neutralized variants of concerns. Furthermore, LAIV-CA4-RBD could boost the BioNTech vaccine for improved mucosal immunity. Interpretation: Our results demonstrated that intranasal influenza-based boost vaccination induces mucosal and systemic immunity for effective SARS-CoV-2 prevention in both upper and lower respiratory systems. Funding: This study was supported by the Research Grants Council Collaborative Research Fund, General Research Fund and Health and Medical Research Fund in Hong Kong; Outbreak Response to Novel Coronavirus (COVID-19) by the Coalition for Epidemic Preparedness Innovations; Shenzhen Science and Technology Program and matching fund from Shenzhen Immuno Cure BioTech Limited; the Health@InnoHK, Innovation and Technology Commission of Hong Kong; National Program on Key Research Project of China; donations from the Friends of Hope Education Fund; the Theme-Based Research Scheme.

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