title: Protective effects of hydrogen sulfide inhalation on oxidative stress in rats with cotton smoke inhalation-induced lung injury.
abstract: The aim of the present study was to investigate the mechanism by which hydrogen sulfide (H2S) inhalation protects against oxidative stress in rats with cotton smoke inhalation-induced lung injury. A total of 24 male Sprague-Dawley rats were separated randomly into four groups, which included the control, H2S, smoke and smoke + H2S groups. A rat model of cotton smoke inhalation-induced lung injury was established following inhalation of 30% oxygen for 6 h. In addition, H2S (80 ppm) was inhaled by the rats in the H2S and smoke + H2S groups for 6 h following smoke or sham-smoke inhalation. Enzyme-linked immunosorbent assays were performed to measure various indices in the rat lung homogenate, while the levels of nuclear factor (NF)-κBp65 in the lung tissue of the rats were determined and semiquantitatively analyzed using immunohistochemistry. In addition, quantitative fluorescence polymerase chain reaction was employed to detect the mRNA expression of inducible nitric oxide synthase (iNOS) in the rat lung tissue. The concentrations of malondialdehyde (MDA), nitric oxide (NO), inducible iNOS and NF-κBp65, as well as the sum-integrated optical density of NF-κBp65 and the relative mRNA expression of iNOS, in the rat lung tissue from the smoke + H2S group were significantly lower when compared with the smoke group. The concentrations of MDA, NO, iNOS and NF-κBp65 in the H2S group were comparable to that of the control group. Therefore, inhalation of 80 ppm H2S may reduce iNOS mRNA transcription and the production of iNOS and NO in rats by inhibiting NF-κBp65 activation, subsequently decreasing oxidative stress and cotton smoke inhalation-induced lung injury.
authors.affiliation: Pulmonary and Critical Care Medicine of PLA Navy General Hospital, Beijing 100048, P.R. China.
authors.forename: Zhi-Hai
authors.initials: ZH
authors.lastname: Han
authors.affiliation: Political Department Clinic of Shenyang Military Area Command, Shenyang, Liaoning 110032, P.R. China.
authors.forename: Y I
authors.initials: YI
authors.lastname: Jiang
authors.affiliation: Pulmonary and Critical Care Medicine of PLA Navy General Hospital, Beijing 100048, P.R. China.
authors.forename: Yun-You
authors.initials: YY
authors.lastname: Duan
authors.affiliation: Pulmonary and Critical Care Medicine of PLA Navy General Hospital, Beijing 100048, P.R. China.
authors.forename: Xiao-Yang
authors.initials: XY
authors.lastname: Wang
authors.affiliation: Pulmonary and Critical Care Medicine of PLA Navy General Hospital, Beijing 100048, P.R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Pulmonary and Critical Care Medicine of PLA Navy General Hospital, Beijing 100048, P.R. China.
authors.forename: Ting-Zheng
authors.initials: TZ
authors.lastname: Fang
keywords: acute lung injury; hydrogen sulfide; oxidative stress; smoke inhalation injury