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• W2952417391 endingPage "C543" @default.
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• W2952417391 abstract "NF-κB is a central regulator of inflammatory and immune responses and has been shown to regulate transcription of several inflammatory factors as well as promote acute lung injury. However, the regulation of NF-κB signaling in acute lung injury has yet to be investigated. Human pulmonary alveolar epithelial cells (HPAEpiC) were treated with LPS to establish an acute lung injury model in vitro in which LPS stimulation resulted in pulmonary epithelial barrier breakdown and hyperpermeability. Cell viability was measured by CCK-8, and the transepithelial permeability was examined by measurement of transepithelial electrical resistance (TEER) and the transepithelial flux. Expression of ubiquitin-specific peptidase 9 X-linked (USP9X), zonula occludens (ZO-1), occludin and NF-κBp65, and the secretion of TNF-α and IL-1β were measured by Western blotting and ELISA, respectively. For in vivo studies, mice were intraperitoneally injected with LPS and/or NF-κB inhibitor pyrrolidine dithiocarbamate (PDTC). Lung tissues were harvested for hematoxylin-eosin staining and Western blotting, and bronchoalveolar lavage fluid (BALF) was harvested for ELISA. We found that treatment with LPS in HPAEpiC inhibited cell viability and induced the expression of USP9X. Interestingly, knockdown of USP9X and treatment with PDTC suppressed LPS-induced HPAEpiC injury. USP9X overexpression promoted NF-κB activation, while NF-κB inactivation inhibited USP9X transcription and HPAEpiC injury induced by USP9X overexpression. Furthermore, LPS also induced the expression of USP9X in lungs, which was inhibited by PDTC. Taken together, these results demonstrate a critical role of USP9X-NF-κBp65 loop in mediating LPS-induced acute lung injury and may serve as a potential therapeutic target in acute lung injury." @default.
• W2952417391 created "2019-06-27" @default.
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• W2952417391 date "2019-09-01" @default.
• W2952417391 modified "2023-10-12" @default.
• W2952417391 title "USP9X promotes LPS-induced pulmonary epithelial barrier breakdown and hyperpermeability by activating an NF-κBp65 feedback loop" @default.
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• W2952417391 doi "https://doi.org/10.1152/ajpcell.00094.2019" @default.
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