Viral cell entry & IFN18 Apr 2021 21:10
A paper looking at viral entry to cells.
“In this study, we provide evidence that IFITM2 has potent inhibitory activity against SARS-CoV-2 entry and constitutes at least part of the antiviral activity conferred by treatment of target cells with IFN-ß.”
“Studies from many groups have shown that while SARS-CoV-2 is a poor inducer of IFN responses in infected cells early in the replication cycle, it is highly sensitive to pretreatment of target cells by type I, II, and III IFNs (17, 18, 38). This suggests the potential for multiple ISGs to restrict SARS-CoV-2 replication and has raised the possibility of IFNs as possible treatments for COVID-19 (39). The role of IFNs in SARS-CoV-2 pathogenesis is complex. Genetic lesions in pattern recognition and IFN signaling as well as serum autoantibodies that neutralize type I IFNs are associated with risk of severe coronavirus disease 2019 (COVID-19) (40). However, dysregulated or delayed IFN responses driving systemic inflammation may underlie some of the pathology in COVID-19 (41). Understanding which aspects of the IFN response are antiviral against SARS-CoV-2 is thus of very high importance.”
https://jvi.asm.org/content/95/9/e02422-20