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Yoshida, Masahiro; Minagawa, Shunsuke; Araya, Jun; Sakamoto, Taro; Hara, Hiromichi; Tsubouchi, Kazuya; Hosaka, Yusuke; Ichikawa, Akihiro; Saito, Nayuta; Kadota, Tsukasa; Sato, Nahoko; Kurita, Yusuke; Kobayashi, Kenji; Ito, Saburo; Utsumi, Hirohumi; Wakui, Hiroshi; Numata, Takanori; Kaneko, Yumi; Mori, Shohei; Asano, Hisatoshi; Yamashita, Makoto; Odaka, Makoto; Morikawa, Toshiaki; Nakayama, Katsutoshi; Iwamoto, Takeo; Imai, Hirotaka; Kuwano, Kazuyoshi
Nature communications, 07/2019, Volume: 10, Issue: 1Journal Article
Ferroptosis is a necrotic form of regulated cell death (RCD) mediated by phospholipid peroxidation in association with free iron-mediated Fenton reactions. Disrupted iron homeostasis resulting in excessive oxidative stress has been implicated in the pathogenesis of chronic obstructive pulmonary disease (COPD). Here, we demonstrate the involvement of ferroptosis in COPD pathogenesis. Our in vivo and in vitro models show labile iron accumulation and enhanced lipid peroxidation with concomitant non-apoptotic cell death during cigarette smoke (CS) exposure, which are negatively regulated by GPx4 activity. Treatment with deferoxamine and ferrostatin-1, in addition to GPx4 knockdown, illuminate the role of ferroptosis in CS-treated lung epithelial cells. NCOA4-mediated ferritin selective autophagy (ferritinophagy) is initiated during ferritin degradation in response to CS treatment. CS exposure models, using both GPx4-deficient and overexpressing mice, clarify the pivotal role of GPx4-regulated cell death during COPD. These findings support a role for cigarette smoke-induced ferroptosis in the pathogenesis of COPD.
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