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- W2137904098 abstract "Abstract Activated neutrophils contribute to the development and severity of acute lung injury (ALI). Phosphoinositide 3-kinases (PI3-K) and the downstream serine/threonine kinase Akt/protein kinase B have a central role in modulating neutrophil function, including respiratory burst, chemotaxis, and apoptosis. In the present study, we found that exposure of neutrophils to endotoxin resulted in phosphorylation of Akt, activation of NF-κB, and expression of the proinflammatory cytokines IL-1β and TNF-α through PI3-K-dependent pathways. In vivo, endotoxin administration to mice resulted in activation of PI3-K and Akt in neutrophils that accumulated in the lungs. The severity of endotoxemia-induced ALI was significantly diminished in mice lacking the p110γ catalytic subunit of PI3-K. In PI3-Kγ−/− mice, lung edema, neutrophil recruitment, nuclear translocation of NF-κB, and pulmonary levels of IL-1β and TNF-α were significantly lower after endotoxemia as compared with PI3-Kγ+/+ controls. Among neutrophils that did accumulate in the lungs of the PI3-Kγ−/− mice after endotoxin administration, activation of NF-κB and expression of proinflammatory cytokines was diminished compared with levels present in lung neutrophils from PI3-Kγ+/+ mice. These results show that PI3-K, and particularly PI3-Kγ, occupies a central position in regulating endotoxin-induced neutrophil activation, including that involved in ALI." @default.
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- W2137904098 date "2001-12-01" @default.
- W2137904098 modified "2023-10-15" @default.
- W2137904098 title "Involvement of Phosphoinositide 3-Kinases in Neutrophil Activation and the Development of Acute Lung Injury" @default.
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- W2137904098 doi "https://doi.org/10.4049/jimmunol.167.11.6601" @default.
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