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Febuxostat (FBX), a selective inhibitor of xanthine oxidase, has several biological properties such as antioxidant, anti-inflammatory and anti-apoptosis activities. The purpose of this study was to evaluate the protective effect of FBX against ionizing radiation (IR)-induced lung injury through mitigation of oxidative stress, inflammation and apoptosis. Sixty-four mice were randomized into eight groups as control, FBX (5, 10, and 15 mg/kg), IR (6 Gy), and IR + FBX (IR + FBX in three doses). Mice were received FBX for 8 consecutive days and then were exposed to IR at a single dose (6 Gy) of X-ray. At 1 and 7 days after irradiation, the biochemical parameters were analyzed in lung tissue, while histological and immunohistochemical examinations were evaluated 1 week after irradiation. Irradiation led to elevate of oxidative stress parameters (an increase of MDA, PC, NO, and decrease of GSH), inflammation and apoptosis in lung of mice. Furthermore, IR resulted in histopathological changes in the lung tissues. These changes were significantly mitigated by FBX treatment. FBX also inhibited immunoreactivity of caspase-3, NF-κB, and reduced oxidative stress. This study showed that FBX is able to protect lung injury induced by IR through inhibiting apoptosis (caspase-3), oxidative stress and inflammation (NF-κB).

Febuxostat, an inhibitor of xanthine oxidase, ameliorates ionizing radiation-induced lung injury by suppressing caspase-3, oxidative stress and NF-κB