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Open Access item In vivo antioxidant treatment protects against bleomycin-induced lung damage in rats
Morcillo, E. J.
|Keywords:||Pulmonary fibrosis, Bleomycin, Rat, N-acetylcysteine, Inflammation|
|Citation:||British Journal of Pharmacology 138(6): 1037–1048 (2003)|
|Abstract:||This study examines the activity of the antioxidant N-acetylcysteine on bleomycin-induced pulmonary fibrosis in rats with emphasis on the early inflammatory phase.
Rats receiving N-acetylcysteine (300 mg kg−1 day−1, intraperitoneal) had less augmented lung wet weight, and lower levels of proteins, lactate dehydrogenase, neutrophil and macrophage counts in bronchoalveolar lavage fluid and lung myeloperoxidase activity with a betterment of histological score at 3 days postbleomycin.
A diminished lung GSH/GSSG ratio and augmented lipid hydroperoxides were observed 3 days postbleomycin. These changes were attenuated by N-acetylcysteine. Alveolar macrophages from bleomycin-exposed rats released augmented amounts of superoxide anion and nitric oxide. N-Acetylcysteine did not modify superoxide anion generation but reduced the increased production of nitric oxide.
N-Acetylcysteine suppressed the bleomycin-induced increased activation of lung NF-κB (shift assay and immunohistochemistry), and decreased the augmented levels of the early inflammatory cytokines, tumour necrosis factor-α, interleukin-β, interleukin-6 and macrophage inflammatory protein-2 observed in bronchoalveolar lavage fluid at 1 and 3 days postbleomycin exposure.
At 15 days postbleomycin, N-acetylcysteine decreased collagen deposition in bleomycin-exposed rats (hydroxyproline content: 6351±669 and 4626±288 μg per lung in drug vehicle- and N-acetylcysteine-treated rats, respectively; P<0.05). Semiquantitative histological assessment at this stage showed less collagen deposition in N-acetylcysteine-treated rats compared to those receiving bleomycin alone.
These results indicate that N-acetylcysteine reduces the primary inflammatory events, thus preventing cellular damage and the subsequent development of pulmonary fibrosis in the bleomycin rat model.|
|Publisher version (URL):||http://dx.doi.org/10.1038/sj.bjp.0705138|
|Appears in Collections:||(IIBB) Artículos|
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