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Identification and characterization of influenza virus activators in the human lung

Subject Area Virology
Term from 2019 to 2023
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 426563517
 
Final Report Year 2024

Final Report Abstract

We and others could previously demonstrate that human influenza A viruses (IAV) are activated by the cellular protease TMPRSS2. Several TMPRSS2-related proteases were also shown to activate IAV but their expression in relevant target cells and their contribution to viral spread were unclear. Furthermore, the structure of the TMPRSS2 mRNA and suitable target sites for antisense oligonucleotide (ASOs) were unknown. In addition, it was unclear to what extend and how the so called neck domain of TMPRSS2 contributes to virus activation. Finally, it remained to be investigated whether TMPRSS2 promotes viral spread in primates. These questions were to be addressed by the proposed research. In the light of the COVID-19 pandemic we maintained this line of research but refocused our efforts on SARS-CoV-2, since coronaviruses also employ TMPRSS2 for activation. Indeed, we could demonstrate that SARS-CoV-2 can use TMPRSS2 for cell entry and successfully employed chemicals to obtain insights into the structure of the TMPRSS2 mRNA, allowing the successful design of ASOs. Furthermore, we found that several TMPRSS2-related proteases were coexpressed with the SARS-CoV-2 receptor ACE2 in the airways and might thus support viral spread. In addition, we obtained evidence that the neck region is important for activation of IAV and coronaviruses by TMPRSS2 and related proteases but the underlying mechanism could not be clarified. Finally, we identified TMPRSS2 inhibitors and provided evidence that TMPRSS2 (or related proteases) but not the auxiliary protease cathepsin L is required for SARS-CoV-2 spread in human respiratory epithelium ex vivo.

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