血红素加氧酶-1在高氧肺损伤小鼠中的表达及作用

目的 探讨血红素加氧酶-1(HO-1)在高氧造成的肺损伤转基因小鼠和正常小鼠中的肺部表达水平及其作用.方法 把32只新生小鼠分成4组:野生型组(WT组),特异性转基因小鼠全身高水平表达HO-1组[HO-1-FL(H)组,细胞质]、特异性转基因小鼠全身低水平表达HO-1组[HO-1-FL(L)组,细胞质]和切去C末端HO-1(Nuc-HO-1-TR组,细胞核).把4组小鼠暴露在高氧环境中3d,然后放到正常空气环境中,通过免疫组织化学、免疫荧光等实验技术来观察小鼠3d、7d和14 d肺泡发育情况及HO-1在小鼠肺部表达情况.结果 HO-1在HO-1-FL(H)组小鼠肺部高表达,高氧暴露3d后4组小鼠肺部肺泡发育都受到了损害,在正常空气环境中7、14 d时HO-1-FL(H)组小鼠的肺泡发育恢复得最好.结论 小鼠肺部适度高水平的HO-1表达有助于高氧环境造成的小鼠肺损伤的恢复.

Expression and role of heme oxygenase-1 in mouse lung injury induced by hyperoxia

Objective To investigate the expression of heme oxygenase-1 in lungs of transgenic mice and normal mice and its effects.Methods 32 newborn mice were divided into four groups:wild-type group (WT group),specific transgenic mice expressed hemoglobin oxygenase-1 high level group[HO-1-FL(H) group,cytoplasm],low level WT group[HO-1-FL(L) group,cytoplasm] and the C-terminal heme oxygenase-1 group(Nuc-HO-1-TR group,nucleus).Then four groups of mice were exposed to high oxygen for 3 days,after that placed in normal air environment.Immunohistochemistry and immunofluorescence were used to observe the alveolar development and hemoglobin addition at 3 days,7 days and 14 days oxygenase-1 expression in the lungs of mice.Results The levels of heme oxygenase-1 were significantly higher in the lungs of HO-1-FL (H) group,and the alveolar development in the lungs of the four groups after 3 days of hyperoxia exposure was impaired.In the normal air environment,the recovery of alveolar development in HO-1-FL (H) group on the 7th and 14th day was the best.Conclusion The moderately high levels of heme oxygenase-1 expression in the lungs contribute to the recovery of lung injury in mice caused by hyperoxic environments.