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Necroptosis is a programmed cell death that is inflammatory in nature owing to the release of danger-associated molecular patterns from the ruptured cell membrane. However, necroptosis also constitutes an important arm of host immune responses. Thus, a balanced inflammatory response determines the disease outcome. We report that the NS1 protein of IAV participates in necroptosis by interacting with MLKL, resulting in increased MLKL oligomerization and membrane translocation. These results reveal a novel function of the NS1 protein and the mechanism by which IAV induces necroptosis. Moreover, we show that this interaction enhances NLRP3 inflammasome activation and IL-1β processing and secretion. This information may contribute to a better understanding of the role of necroptosis in IAV-induced inflammation.

journal of virology

The NS1 Protein of Influenza A Virus Participates in Necroptosis by Interacting with MLKL and Increasing Its Oligomerization and Membrane Translocation