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• W1993262912 endingPage "L1048" @default.
• W1993262912 startingPage "L1040" @default.
• W1993262912 abstract "We showed previously that epithelial growth factor (EGF) receptor (EGFR) signaling is triggered by metallic compounds associated with ambient air particles. Specifically, we demonstrated that As, Zn, and V activated the EGFR tyrosine kinase and the downstream kinases MEK1/2 and ERK1/2. In this study, we examined the role of Ras in EGFR signaling and the nuclear factor-κB (NF-κB) activation pathway and the possible interaction between these two signaling pathways in a human airway epithelial cell line (BEAS-2B) exposed to As, V, or Zn ions. Each metal significantly increased Ras activity, and this effect was inhibited by the EGFR tyrosine kinase activity inhibitor PD-153035. Adenoviral-mediated overexpression of a dominant-negative mutant form of Ras(N17) significantly blocked MEK1/2 or ERK1/2 phosphorylation in As-, Zn-, or V-exposed BEAS-2B cells but caused little inhibition of V-, Zn- or EGF-induced EGFR tyrosine phosphorylation. This confirmed Ras as an important intermediate effector in EGFR signaling. Interestingly, V, but not As, Zn, or EGF, induced IκBα serine phosphorylation, IκBα breakdown, and NF-κB DNA binding. Moreover, PD-153035 and overexpression of Ras(N17) each significantly blocked V-induced IκBα breakdown and NF-κB activation, while inhibition of MEK activity with PD-98059 failed to do so. In summary, exposure to As, Zn, and V initiated EGFR signaling and Ras-dependent activation of MEK1/2 and ERK1/2, but only V induced Ras-dependent NF-κB nuclear translocation. EGFR signaling appears to cross talk with NF-κB signaling at the level of Ras, but additional signals appear necessary for NF-κB activation. Together, these data suggest that, in V-treated BEAS-2B cells, Ras-dependent signaling is essential, but not sufficient, for activation of NF-κB." @default.
• W1993262912 created "2016-06-24" @default.
• W1993262912 creator A5044617284 @default.
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• W1993262912 creator A5082891287 @default.
• W1993262912 date "2002-05-01" @default.
• W1993262912 modified "2023-09-23" @default.
• W1993262912 title "Role of Ras in metal-induced EGF receptor signaling and NF-κB activation in human airway epithelial cells" @default.
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• W1993262912 doi "https://doi.org/10.1152/ajplung.00390.2001" @default.
• W1993262912 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11943669" @default.
• W1993262912 hasPublicationYear "2002" @default.
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