Tetomilast Attenuates Elastase-Induced Pulmonary Emphysema through Inhibition of Oxidative Stress in Rabbits

  • Baila Bulin
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Ohno Yasushi
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Nagamoto Hisashi
    Otsuka Pharmaceutical Co., Ltd.
  • Kotosai Kounori
    Otsuka Pharmaceutical Co., Ltd.
  • Yabuuchi Youichi
    Otsuka Pharmaceutical Co., Ltd.
  • Funaguchi Norihiko
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Ito Fumitaka
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Endo Junki
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Mori Hidenori
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Takemura Genzou
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Fujiwara Takako
    Kyoto Womens University
  • Fujiwara Hisayoshi
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University
  • Minatoguchi Shinya
    Second Department of Internal Medicine, Graduate School of Medicine, Gifu University

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Tetomilast was originally identified as a potent inhibitor of superoxide production in human neutrophils, and is of interest because it may relieve oxidative stress related to chronic obstructive pulmonary disease (COPD). Our objective was to determine whether tetomilast effectively protects against the development of porcine pancreatic elastase (PPE)-induced emphysema in rabbits. Rabbits were divided into three groups (sham n=19, PPE n=19, PPE/Tetomilast n=18). The rabbits were once daily orally administered vehicle solution or tetomilast 5 d/week for 4 weeks before the PPE instillation. We compared pulmonary function, inflammatory cell infiltration, oxidative stress, and the incidences of apoptosis among the three groups. Tetomilast suppressed PPE-induced increases in the incidence of apoptosis and the production of 8-hydroxy-deoxyguanosine (8-OHdG) in lung tissues. PPE-instilled rabbits treated with tetomilast showed significantly less mean linear intercept and significantly better pulmonary function than rabbits administered PPE alone. Tetomilast may inhibit the development of emphysema by attenuating pulmonary inflammation and apoptosis caused by PPE-induced oxidative stress.

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