Activation of transcription factor Nrf2 signalling by the sphingosine kinase inhibitor SKI-II is mediated by the formation of Keap1 dimers

Nicolas Mercado, Yasuo Kizawa, Keitaro Ueda, Yeping Xiong, Genki Kimura, Audric Moses, Jonathan M. Curtis, Kazuhiro Ito, Peter J. Barnes

研究成果: ジャーナルへの寄稿記事査読

25 被引用数 (Scopus)

抄録

Background: Anti-oxidant capacity is crucial defence against environmental or endogenous oxidative stress. Nuclear factor erythroid 2-related factor 2 (Nrf2) is a redox-sensitive transcription factor that plays a key defensive role against oxidative and cytotoxic stress and cellular senescence. However, Nrf2 signalling is impaired in several aging-related diseases, such as chronic pulmonary obstructive disease (COPD), cancer, and neurodegenerative diseases. Thus, novel therapeutics that enhance Nrf2 signalling are an attractive approach to treat these diseases. Methodology/Principal Findings: Nrf2 was stabilized by SKI-II (2-(p-hydroxyanilino)-4-(p-chlorophenyl) thiazole), which is a known sphingosine kinase inhibitor, in human bronchial epithelial cell line, BEAS2B, and in primary human bronchial epithelial cells, leading to enhancement of anti-oxidant proteins, such as HO-1, NQO1 and GCLM. The activation of Nrf2 was achieved by the generation of inactive dimerized form of Keap1, a negative regulator of Nrf2 expression, which was independent of sphingosine kinase inhibition. Using mice that were exposed to cigarette smoke, SKI-II induced Nrf2 expression together with HO-1 in their lungs. In addition, SKI-II reduced cigarette smoke mediated oxidative stress, macrophages and neutrophil infiltration and markers of inflammation in mice. Conclusions/Significance: SKI-II appears to be a novel activator of Nrf2 signalling via the inactivation of Keap1.

本文言語英語
論文番号e88168
ジャーナルPLoS ONE
9
2
DOI
出版ステータス出版済み - 5 2月 2014

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