脂多糖对吸烟大鼠肺泡巨噬细胞增殖细胞核抗原及肺泡Ⅱ型上皮细胞Fas/FasL系统表达的影响

目的:研究脂多糖(LPS)对吸烟大鼠肺泡巨噬细胞(AM)增殖细胞核抗原(PCNA)及肺泡Ⅱ型上皮细胞Fas/FasL系统表达的作用。方法:应用免疫组织化学SABC法和免疫荧光标记技术,检测不同时期LPS对吸烟大鼠肺泡巨噬细胞PCNA表达和肺泡Ⅱ型上皮细胞Fas/FasL系统表达的影响。结果:吸烟大鼠AM上PCNA表达在第3、4月达高峰,LPS刺激的各组PCNA表达明显高于不加LPS组(P＜0.01);肺泡Ⅱ型上皮细胞Fas/FasL系统表达在加入LPS组表达显著高于未加LPS组(P＜0.01),且与AM上PCNA表达的变化相平行。结论:吸烟引起气道AM增殖速率加快,AM在肺泡Ⅱ型上皮细胞损伤与修复过程中起重要作用。

Effects of lipopolysaccharide on proliferating cell nuclear antigen expression on alveolar macrophages and Fas/FasL system expression on alveolar type Ⅱ epithelial cells in smoking rats

AIM:To study the effect of proliferating cell nuclear antigen (PCNA) expression on alveolar macrophages (AM) and Fas/FasL expression on alveolar type Ⅱ epithelial cells induced by lipopolysaccharide (LPS) in smoking rats. METHODS:Immunohistochemistry SABC and immunofluorescence techniques were used to examine PCNA expression on AM and Fas/FasL system expression on alveolar type Ⅱ epithelial cells in smoking rats of different stages induced by LPS. RESULTS:The AM PCNA expression in smoking rats reached the highest level after 3 or 4 months. The AM PCNA expression in every groups stimulated by LPS significantly increased ( P＜0.01). The Fas/FasL system expression on alveolar type Ⅱepithelial induced by LPS were higher than control groups ( P＜0.01). Both the AM PCNA expression and Fas/FasL system expression on alveolar type Ⅱ epithelial cells were parallel. CONCLUSION:Smoking caused the increase in proliferous rate of AM and it may play an important role in the regulation of the injury and repair of alveolar type Ⅱ epithelial cells.