Intranasal influenza-vectored COVID-19 vaccine restrains the SARS-CoV-2 inflammatory response in hamsters

Nat Commun. 2023 Jul 11;14(1):4117. doi: 10.1038/s41467-023-39560-9.

Abstract

The emergence of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) variants and "anatomical escape" characteristics threaten the effectiveness of current coronavirus disease 2019 (COVID-19) vaccines. There is an urgent need to understand the immunological mechanism of broad-spectrum respiratory tract protection to guide broader vaccines development. Here we investigate immune responses induced by an NS1-deleted influenza virus vectored intranasal COVID-19 vaccine (dNS1-RBD) which provides broad-spectrum protection against SARS-CoV-2 variants in hamsters. Intranasal delivery of dNS1-RBD induces innate immunity, trained immunity and tissue-resident memory T cells covering the upper and lower respiratory tract. It restrains the inflammatory response by suppressing early phase viral load post SARS-CoV-2 challenge and attenuating pro-inflammatory cytokine (Il6, Il1b, and Ifng) levels, thereby reducing excess immune-induced tissue injury compared with the control group. By inducing local cellular immunity and trained immunity, intranasal delivery of NS1-deleted influenza virus vectored vaccine represents a broad-spectrum COVID-19 vaccine strategy to reduce disease burden.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • COVID-19 Vaccines
  • COVID-19* / prevention & control
  • Cricetinae
  • Humans
  • Influenza Vaccines*
  • Influenza, Human*
  • SARS-CoV-2

Substances

  • COVID-19 Vaccines
  • Influenza Vaccines

Supplementary concepts

  • SARS-CoV-2 variants