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3-Carbamoyl-Proxyl Nitroxide Radicals Attenuate Bleomycin-Induced Pulmonary Fibrosis in Mice.
Free Radical Biology & Medicine 2021 May 12
Idiopathic pulmonary fibrosis (IPF) is a fatal interstitial lung disease with a poor prognosis and limited treatment options. Oxidative and nitrosative stress is implicated as one of the main pathogenic pathways in IPF. Hence, the rationale for testing antioxidants as potential therapeutics for lung fibrosis is appealing, which has not demonstrated, so far, a consistent benefit. We have recently demonstrated that nitroxides, particularly 3-carbamoyl-proxyl (3-CP), markedly reduce airway inflammation, airway hyper-responsiveness, and protein nitration of the lung tissue in a mouse model of ovalbumin-induced acute asthma, thus prompting its use for the treatment of IPF. The present study investigates the effect of 3-CP on the development of lung fibrosis using the murine intratracheal bleomycin model. 3-CP was administered either intranasally or orally during the entire experiment or starting 7 days after induction of the lung injury. 3-CP was found to be both a preventive and a therapeutic drug reducing the lung fibrosis (histological score), the increase in collagen content, protein nitration, TGF-β levels, the degree of weight loss as well as inhibiting the impairment of lung function. Nitroxides are catalytic antioxidants that preferentially detoxify radicals, and therefore the effect of 3-CP on the severity of the disease supports the involvement of reactive oxygen and nitrogen species in the disease pathology.
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