Phosphoinositide 3-kinase gamma required for lipopolysaccharide-induced transepithelial neutrophil trafficking in the lung.
Phosphoinositide 3-kinase gamma required for lipopolysaccharide-induced transepithelial neutrophil trafficking in the lung.
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DOI:
10.1183/09031936.00085509
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发表时间:
2010-05
期刊:
影响因子:
--
通讯作者:
Ley K
中科院分区:
文献类型:
--
作者:
Reutershan J;Saprito MS;Wu D;Rückle T;Ley K
Phosphoinositide 3-kinase γ (PI3Kγ) is a critical mediator of directional cell movement. Here, we sought to characterize the role of PI3Kγ in mediating the different steps of PMN trafficking in the lung. In a murine model of LPS-induced lung injury, PMN migration into the different lung compartments was determined in PI3Kγ gene-deficient (PI3Kγ−/−) and wildtype mice. Bone marrow chimeras were created to characterize the role of PI3Kγ on hematopoietic vs. non-hematopoietic cells. A small molecule PI3Kγ inhibitor was tested in vitro and in vivo. PMN adhesion to the pulmonary endothelium and transendothelial migration into the lung interstitium was enhanced in PI3Kγ−/− mice. However, transepithelial migration into the alveolar space was reduced in these mice. When irradiated PI3Kγ−/− mice were reconstituted with bone marrow from wildtype mice, migratory activity into the alveolar space was restored partially. A small molecule PI3Kγ inhibitor reduced chemokine-induced PMN migration in vitro when PMNs or epithelial cells but not when endothelial cells were treated. The inhibitor also reduced LPS-induced PMN migration in vivo. We conclude that PI3Kγ is required for transepithelial but not for transendothelial migration in LPS-induced lung injury. Inhibition of PI3Kγ activity may be effective at curbing excessive PMN infiltration in lung injury.
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