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- Title
Influenza Virus—Cytokine-Protease Cycle in the Pathogenesis of Vascular Hyperpermeability in Severe Influenza.
- Authors
Siye Wang; Trong Quang Le; Naoki Kurihara; Junji Chida; Youssouf Cisse; Mihiro Vano; Hiroshi Kido
- Abstract
Background. Severe influenza is characterized by cytokine storm and multiorgan failure with edema. The aim of this study was to define the impact of the cytokine storm on the pathogenesis of vascular hyperpermeability in severe influenza. Methods. Weanling mice were infected with influenza A WSN/33(H1N1) virus. The levels of proinflamniatory cytokines, tumor necrosis factor (TNF) α, interleukin (IL) 6, IL-1/, and trypsin were analyzed in the lung, brain, heart, and cultured human umbilical vein endothelial cells. The effects of transcriptional inhibitors on cytokine and trypsin expressions and viral replication were determined. Results. Influenza A virus infection resulted in significant increases in TNF-α, IL-6, IL- 113, viral hemagglutinin- processing protease trypsin levels, and viral replication with vascular hyperpermeability in lung and brain in the first 6 days of infection. Trypsin upregulation was suppressed by transcriptional inhibition of cytokines in vivo and by anti-cytokine antibodies in endothelial cells. Calcium mobilization and loss of tight junction constituent, zonula occludens-I, associated with cytokine- and trypsin-induced endothelial hyperpermeability were inhibited by a protease-activated receptor-2 antagonist and a trypsin inhibitor. Conclusions. The influenza virus-cytokine-protease cycle is one of the key mechanisms of vascular hyper- permeability in severe influenza.
- Publication
Journal of Infectious Diseases, 2010, Vol 202, Issue 7, p991
- ISSN
0022-1899
- Publication type
Academic Journal
- DOI
10.1086/656044