Nuclear factor-kappa b activation in silica-induced interleukin 8 production by human bronchial epithelial cells.
Recent studies indicate that interleukin 8 (IL-8) plays an important role in interstitial lung diseases including silica-induced lung inflammation. To investigate the regulation of IL-8 expression and production in human bronchial epithelial cells, we examined the effects of silica on NF-kappaB activation. Human bronchial epithelial cell line BET-1A was cultured with hormonally defined Ham's F12 medium. The administration of silica induced IL-8 production in BET-1A dose-dependently and time-dependently. Northern blot analysis demonstrated that silica upregulated IL-8 expression in BET-1A. Moreover, electrophoretic mobility shift assays revealed that NF-kappaB activation occurred in the presence of silica, which was inhibited by antioxidants such as N-acetylcysteine (NAC). These data suggest that reactive oxygen species may be involved in the activation of NF-kappaB induced by silica.
Desaki
M
M
Department of Respiratory Medicine, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. desaki-phy@h.u-tokyo.ac.jp
Takizawa
H
H
Kasama
T
T
Kobayashi
K
K
Morita
Y
Y
Yamamoto
K
K
D000704:Analysis of Variance; D000975:Antioxidants / Q000494:pharmacology; D001980:Bronchi / Q000187:drug effects* / Q000378:metabolism; D002633:Chemotaxis / Q000187:drug effects; D004586:Electrophoresis; D004847:Epithelial Cells / Q000187:drug effects / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D016209:Interleukin-8 / Q000096:biosynthesis* / Q000235:genetics; D016328:NF-kappa B / Q000378:metabolism*; D009504:Neutrophils / Q000187:drug effects / Q000502:physiology; D012333:RNA, Messenger / Q000096:biosynthesis; D017382:Reactive Oxygen Species / Q000378:metabolism; D012822:Silicon Dioxide / Q000494:pharmacology*
D000975:Antioxidants; D016209:Interleukin-8; D016328:NF-kappa B; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D012822:Silicon Dioxide