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dc.contributor.authorPotteti, Haranatha R.
dc.contributor.authorHei, Tom K.
dc.contributor.authorReddy, Narsa M.
dc.contributor.authorKalvakolanu, Dhananjaya V.
dc.contributor.authorReddy, Sekhar P.
dc.date.accessioned2013-12-02T16:06:31Z
dc.date.available2013-12-02T16:06:31Z
dc.date.issued2013
dc.identifier.bibliographicCitationPotteti, H. R., Reddy, N. M., Hei, T. K., Kalvakolanu, D. V. and Reddy, S. P. The NRF2 Activation and Antioxidative Response Are Not Impaired Overall during Hyperoxia-Induced Lung Epithelial Cell Death. Oxidative Medicine and Cellular Longevity. 2013. DOI: 10.1155/2013/798401en_US
dc.identifier.issn1942-0900
dc.identifier.urihttp://hdl.handle.net/10027/10709
dc.descriptionCopyright © 2013 Haranatha R. Potteti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This is a copy of an article published in the Oxidative Medicine and Cellular Longevity © 2013 Hindawi Publishing Corporationen_US
dc.description.abstractLung epithelial and endothelial cell death caused by pro-oxidant insults is a cardinal feature of acute lung injury/acute respiratory distress syndrome (ALI/ARDSs) patients. The NF-E2-related factor 2 (NRF2) activation in response to oxidant exposure is crucial to the induction of several antioxidative and cytoprotective enzymes that mitigate cellular stress. Since prolonged exposure to hyperoxia causes cell death, we hypothesized that chronic hyperoxia impairs NRF2 activation, resulting in cell death. To test this hypothesis, we exposed nonmalignant small airway epithelial cells (AECs) to acute (1–12 h) and chronic (36–48 h) hyperoxia and evaluated cell death, NRF2 nuclear accumulation and target gene expression, and NRF2 recruitment to the endogenous HMOX1 and NQO1 promoters. As expected, hyperoxia gradually induced death in AECs, noticeably and significantly by 36 h; ∼60% of cells were dead by 48 h. However, we unexpectedly found increased expression levels of NRF2-regulated antioxidative genes and nuclear NRF2 in AECs exposed to chronic hyperoxia as compared to acute hyperoxia. Chromatin Immunoprecipitation (ChIP) assays revealed an increased recruitment of NRF2 to the endogenous HMOX1 and NQO1 promoters in AECs exposed to acute or chronic hyperoxia. Thus, our findings demonstrate that NRF2 activation and antioxidant gene expression are functional during hyperoxia-induced lung epithelial cell death and that chronic hyperoxia does not impair NRF2 signaling overall.en_US
dc.description.sponsorshipThis work was funded by the National Institute of Health Grants HL66109, ES11863 and ES18998 (to Sekhar P. Reddy), and CA78282 and CA105005 (to Dhananjaya V. Kalvakolanu).en_US
dc.language.isoen_USen_US
dc.publisherHindawi Publishing Corporationen_US
dc.titleThe NRF2 Activation and Antioxidative Response Are Not Impaired Overall during Hyperoxia-Induced Lung Epithelial Cell Deathen_US
dc.typeArticleen_US


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