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• W2059629227 abstract "Zinc is an essential micronutrient, but is proinflammatory when inhaled into the lung. While it is recognized that zinc exposure of airway epithelial cells activates the transcription factor NF-kappaB and increases the expression of inflammatory cytokines to mediate this response, the underlying mechanism of NF-kappaB activation remains to be characterized. In this study, we investigated these Zn2+-induced signaling mechanisms in the BEAS-2B human airway epithelial cell line. Fifty micromolars Zn2+ induced NF-kappaB-dependent transcriptional activity. However, this occurred independently of IkappaBalpha degradation, an essential event in activation of the canonical NF-kappaB pathway, which is induced by physiological stimuli such as TNFalpha and IL-1beta. We also observed that 50 microM Zn2+ exposure caused p65/RelA phosphorylation on Ser 276, Ser 529, and Ser 536 in both cytoplasmic and nuclear cell fractions. Mutational analysis pointed to Ser 536 of p65/RelA as the determinant of Zn2+-induced NF-kappaB transactivation in BEAS-2B cells. Pharmacological inhibition of IKKalpha/beta activity reduced both Zn2+-induced p65/RelA phosphorylation at Ser 536 and NF-kappaB-dependent transcriptional activity, suggesting that IKKalpha/beta is necessary for these Zn2+-induced effects. Taken together, these data show that exposure to supraphysiological concentrations of Zn2+ induces NF-kappaB-dependent transcription through an alternate mechanism, suggesting a novel pathway for cellular responses to environmental stress." @default.
• W2059629227 created "2016-06-24" @default.
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• W2059629227 date "2007-03-01" @default.
• W2059629227 modified "2023-09-27" @default.
• W2059629227 title "Zn2+-induced NF-κB-dependent transcriptional activity involves site-specific p65/RelA phosphorylation" @default.
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• W2059629227 doi "https://doi.org/10.1016/j.cellsig.2006.08.003" @default.
• W2059629227 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17008051" @default.
• W2059629227 hasPublicationYear "2007" @default.
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