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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Mucosal+Immunol 2018 ; 11 (1): 209-19 Nephropedia Template TP
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IFN-? increases susceptibility to influenza A infection through suppression of group II innate lymphoid cells #MMPMID28513592
Mucosal Immunol 2018[Jan]; 11 (1): 209-19 PMID28513592show ga
Increased levels of IFN-? are routinely observed in the respiratory tract following influenza virus infection, yet its potential role remains unclear. We now demonstrate that influenza-induced IFN-? restricts protective innate lymphoid cell group II (ILC2) function in the lung following challenge with the pandemic H1N1 A/CA/04/2009 influenza virus. Specifically, IFN-? deficiency resulted in enhanced ILC2 activity, characterized by increased production of IL-5 and amphiregulin, and improved tissue integrity, yet no change in ILC2 numbers, viral load or clearance. We further found that IFN-?-deficient mice, as well as wild-type animals treated with neutralizing anti-IFN-? antibody, exhibited decreased susceptibility to lethal infection with H1N1 A/CA/04/2009 influenza virus, and moreover that survival was dependent on the presence of IL-5. The beneficial effects of IFN-? neutralization were not observed in ILC2-deficient animals. These data support the novel concept that IFN-? can play a detrimental role in the pathogenesis of influenza through a restriction in ILC2 activity. Thus, regulation of ILC2 activity is a potential target for post-infection therapy of influenza.