Abstract
Antigen-specific tissue-resident memory T cells (Trms) and neutralizing IgA antibodies provide the most effective protection of the lungs from viral infections. To induce those essential components of lung immunity against SARS-CoV-2, we tested various immunization protocols involving intranasal delivery of a novel Modified Vaccinia virus Ankara (MVA)-SARS-2-spike vaccine candidate. We show that a single intranasal MVA-SARS-CoV-2-S application in mice strongly induced pulmonary spike-specific CD8+ T cells, albeit restricted production of neutralizing antibodies. In prime-boost protocols, intranasal booster vaccine delivery proved to be crucial for a massive expansion of systemic and lung tissue-resident spike-specific CD8+ T cells and the development of Th1 - but not Th2 - CD4+ T cells. Likewise, very high titers of IgG and IgA anti-spike antibodies were present in serum and broncho-alveolar lavages that possessed high virus neutralization capacities to all current SARS-CoV-2 variants of concern. Importantly, the MVA-SARS-2-spike vaccine applied in intramuscular priming and intranasal boosting treatment regimen completely protected hamsters from developing SARS-CoV-2 lung infection and pathology. Together, these results identify intramuscular priming followed by respiratory tract boosting with MVA-SARS-2-S as a promising approach for the induction of local, respiratory as well as systemic immune responses suited to protect from SARS-CoV-2 infections.
| Original language | English |
|---|---|
| Article number | 772240 |
| Journal | Frontiers in Immunology |
| Volume | 12 |
| ISSN | 1664-3224 |
| DOIs | |
| Publication status | Published - 11.11.2021 |
Funding
This work was supported by Deutsche Forschungsgemeinschaft, (DFG, German research Foundation) Excellence Strategy EXC 2155 ?RESIST? to RF and TK (Project ID39087428); by funds of the state of Lower Saxony (14-76103-184 CORONA-11/20) to RF and TK; by funds of the BMBF ("NaFoUniMedCovid19? FKZ: 01KX2021; Projects ?COVIM?and ?B-FAST?) to RF and TK and Deutsche Forschungsgemeinschaft, Projektnummer 158989968 - SFB 900 (Projects B1 to RF and B10 to TK); Projektnumber Fo 334/7-1 and the Bundesministerium f?r Bildung und Forschung (DZIF 01.92100 and 01KX2026 to GSu, ZOOVAC 01KI1718 and RAPID 01KI1723G to AV) and by a BMBF (Federal Ministry of Education and Research) project entitled RAPID (Risk assessment in re-pandemic respiratory infectious diseases), 01KI1723G and by the Ministry of Science and Culture of Lower Saxony in Germany (14 - 76103-184 CORONA-15/20) to WB. This work was supported by Deutsche Forschungsgemeinschaft, (DFG, German research Foundation) Excellence Strategy EXC 2155 “RESIST” to RF and TK (Project ID39087428); by funds of the state of Lower Saxony (14-76103-184 CORONA-11/20) to RF and TK; by funds of the BMBF ("NaFoUniMedCovid19” FKZ: 01KX2021; Projects “COVIM”and “B-FAST”) to RF and TK and Deutsche Forschungsgemeinschaft, Projektnummer