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논문 기본 정보

자료유형
학술저널
저자정보
Lee Jong-Uk (Soonchunhyang University Bucheon Hospital) Song Ki Sung (Soonchunhyang University Bucheon Hospital) Hong Jisu (Soonchunhyang University Bucheon Hospital) Shin Hyesun (Soonchunhyang University Bucheon Hospital) Park Eunji (Soonchunhyang University Bucheon Hospital) Baek Junyeong (Soonchunhyang University Bucheon Hospital) Park Shinhee (Soonchunhyang University Bucheon Hospital) Baek Ae-Rin (Soonchunhyang University Bucheon Hospital) Lee Junehyuk (Soonchunhyang University Bucheon Hospital) Jang An Soo (Soonchunhyang University Bucheon Hospital) Kim Do Jin (Soonchunhyang University Bucheon Hospital) Chin Su Sie (Soonchunhyang University Bucheon Hospital) Kim U-Jin (Environmental Health Center Kangwon National University) Jeong Sung Hwan (Gachon University Gil Medical Center) Park Sung-Woo (Soonchunhyang University Bucheon Hospital)
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine Vol.56
발행연도
2024.2
수록면
478 - 490 (13page)
DOI
10.1038/s12276-024-01170-w

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Idiopathic pulmonary fibrosis (IPF) is characterized by aberrant lung remodeling and the excessive accumulation of extracellular matrix (ECM) proteins. In a previous study, we found that the levels of ornithine aminotransferase (OAT), a principal enzyme in the proline metabolism pathway, were increased in the lungs of patients with IPF. However, the precise role played by OAT in the pathogenesis of IPF is not yet clear. The mechanism by which OAT affects fibrogenesis was assessed in vitro using OAT-overexpressing and OAT-knockdown lung fibroblasts. The therapeutic effects of OAT inhibition were assessed in the lungs of bleomycin-treated mice. OAT expression was increased in fibrotic areas, principally in interstitial fibroblasts, of lungs affected by IPF. OAT levels in the bronchoalveolar lavage fluid of IPF patients were inversely correlated with lung function. The survival rate was significantly lower in the group with an OAT level >75.659 ng/mL than in the group with an OAT level ≤75.659 ng/mL (HR, 29.53; p = 0.0008). OAT overexpression and knockdown increased and decreased ECM component production by lung fibroblasts, respectively. OAT knockdown also inhibited transforming growth factor-β1 (TGF)-β1 activity and TGF-β1 pathway signaling. OAT overexpression increased the generation of mitochondrial reactive oxygen species (ROS) by activating proline dehydrogenase. The OAT inhibitor L-canaline significantly attenuated bleomycin-induced lung injury and fibrosis. In conclusion, increased OAT levels in lungs affected by IPF contribute to the progression of fibrosis by promoting excessive mitochondrial ROS production, which in turn activates TGF-β1 signaling. OAT may be a useful target for treating patients with fibrotic lung diseases, including IPF.

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