气管内雾化脂多糖致大鼠肺部炎症损伤模型研究

Intratracheal Atomization of Lipopolysaccharides Induced Lung Inflammatory Injury in Rats Model

目的建立大鼠气管内雾化脂多糖(lipopolysaccharides,LPS)致不同程度肺部炎症损伤模型。方法大鼠给予气管内雾化200μL的LPS溶液,LPS高、中、低组剂量分别为15、5、0.5 mg·kg^(-1),单次给药后24 h进行支气管肺泡灌洗液(bronchoalveolar lavage fluid,BALF)分析、组织病理学检查(肾脏、肺、气管)和血液生化学检查(肌酐、白蛋白、Na+/K+/Cl-)。结果BALF细胞分类计数中,LPS各剂量组出现不同程度白细胞、中性粒细胞、巨噬细胞、嗜酸性和嗜碱性粒细胞增多;LPS高剂量组碱性磷酸酶活性和总蛋白含量较对照组升高(P<0.05);BALF中肿瘤坏死因子(TNF)-α含量呈剂量依赖性升高,与对照组有显著差异。组织病理学检查:对照组肺部出现轻微的血管壁周围水肿,LPS组肺部有炎症细胞渗出伴有泡沫巨噬细胞聚集和中度血管壁周围水肿。结论大鼠气管内雾化不同剂量LPS可致不同程度肺部炎症损伤,气管内雾化LPS方式可作为建立肺部炎症损伤模型的可靠手段。

OBJECTIVE To establish dose-related lung inflammatory injury in rats model with intratracheal atomization of lipopo- lysaccharide （ lipopolysaccharides, LPS）. METHODS Four groups of 4 rats were subjected to solvent or a single dose of LPS by in- tratracheal route using a IA-1B-2 inches-microsprayer. The male rats received 200μL solvent （control）, LPS solutions （15, 5, 0. 5 mg·kg^-1 ）. All rats were sacrificed 24 h after dose administration, biochemical analysis and cell counts on bronchoalveolar lavage flu-id （BALF） were performed on each rat. Lung, trachea and kidney were examined histologically. Serum chemistry profiles of creatinine, ALB, Na, K, C1-were detected. RESULTS Cell counts in BALF showed LPS groups had different degrees of inflammatory reaction. The alkaline phosphatase and total protein concentration were higher in LPS high dose group compared with other groups. In addition, the concentration of TNF-α increased consistently with LPS dose and has statistical significance compared with the control group. Histopathology findings demonstrated that LPS produced an accumulation of foamy macrophages in the lungs and high degree of inflammation. CONCLUSION The results recommends intratracheally atomizing doses of LPS in rats model produced ranks of lung inflammatory injury.