石英尘和博莱霉素诱导的大鼠肺纤维化模型的比较研究

目的 比较石英尘和博莱霉素诱导的大鼠肺纤维化模型中的肺泡炎和早期纤维化改变,并对其机制进行探讨.方法 将大鼠随机分为SiO2组(14只,气管内注入40mg/ml SiO2混悬液1 ml)、BLM组(14只,气管内注入5 mg/kg BLM A5)和对照组(14只,气管内注入1 ml无菌生理盐水).在造模后7、14 d每组各处死7只动物,取肺组织病理切片行HE染色,对肺泡炎进行计分,行饱和苦味酸天狼猩红染色,采用图像分析系统测得各组胶原面积后,进行定量分析,免疫组织化学技术检测肺组织中CD68和TNF-α蛋白表达情况,采用图像分析计算累积吸光度值,进行半定量分析.结果 (1)HE染色光学显微镜下可见,BLM组7d时肺泡炎(肺泡炎评分2.814±0.832)最明显,偏振光下显示BLM组14d时肺纤维化[胶原面积(1284.57±554.72)μm2)]最严重,均明显高于对照组和同期SiO2组,差异有统计学意义(P＜0,05).(2)免疫组化结果显示,BLM组7 d时TNF-α表达最高(17.100±1.831),明显高于对照组(0.420±0.020)、SiO2组7 d(7.909±1.275)及BLM组14d(13.506±1.454),差异均有统计学意义(P＜0.05);在SiO2组14 d时TNF-α表达为22.778±2.512,明显高于BLM组(14 d)、对照组及SiO2组(7 d),差异有统计学意义(P＜0.05).14 d时,SiO2组CD68表达明显高于对照组、BLM组(14 d)及SiO2组(7d),差异有统计学意义(P＜0.05).结论 BLM诱导的大鼠肺损伤模型的早期肺泡炎重于SiO2诱导的大鼠肺损伤模型,纤维化进程早于SiO2诱导的大鼠肺损伤模型,TNF-α在两种模型的病程中均起着重要的作用,而巨噬细胞更为持续地参与了SiO2诱导的肺纤维化.

Abstract：

Objective To compare the pulmonary alveolitis and the early fibrosis of pulmonary fibrosis induced by quartz dust and bleomycin in rats, and investigate their mechanism. Methods The female rats were divided into three groups: control group exposed to normal saline by the trachea; SiO2 group exposed to SiO2 by the trachea; BLM group exposed to BLM A5 by the trachea. Each half of the animals were sacrificed on the 7th andl4th day after expoasure. The lungs of rats were collected to observe pulmonary alveolitis by HE staining and to observe fibrosis by saturated picric acid sirius red staining. The expression of tumor necrosis factor-α (TNF-α) and CD68 in pulmonary tissues were analyzed quantitatively by immunohistochmistry and image analysis system. Results (1) The alveolitis and pulmonary fibrosis of rats in both SiO2 group and BLM group were became more serious gradually over time, HE staining under light microscope showed that BLM group on the 7th day had the most obvious alveolitis (2.814±0.832), the saturated picric acid sirius red staining under polarized light showed that BLM group on the 14th day had the worst pulmonary fibrosis (1284.57±554.72), which were significantly higher than those (103.69±18.29 and 111.78±37.45) in control group and SiO2 group on the 7th day (P＜0.05). (2) The results of immunohistochmistry examination indicated that the expression (17.100±1.831) of TNF-α in the BLM group on the 7th day was significantly higher than those (0.451 ±0.441, 7.909±1.275 and 13.506±1.454) in control group, SiO2 group on 7th day and BLM group on 14th day (P＜0.05). The expression (22.778 ±2.512) of TNF-a in the SiO2 group on the 14th day was significantly higher than those in control group, SiO2 group on 7th day and BLM group on 14th day (P＜0.05).The expression (134.941 ±35.951) of CD68 in the SiO2 group on the 14th day was significantly higher than those in control group,SiO2 group on 7th day and BLM group on 14th day(P＜0.05).Conclusion The early alveolitis of BLM-induced lung injury model was more serious than that of SiO2-induced lung injury model,and the fibrosis process of BLM-induced lung injury model was earlier than that of SiO2-induced lung injury model.TNF-α plays an important role in the conrse of both models.but macrophages is involved in Si06nduced pulmonary in a more continuous way than in BLM-induced pulmonary fibrosis.

The comparative study of quartz dust and bleomycin-induced pulmonary fibrosis in rats

Objective To compare the pulmonary alveolitis and the early fibrosis of pulmonary fibrosis induced by quartz dust and bleomycin in rats, and investigate their mechanism. Methods The female rats were divided into three groups: control group exposed to normal saline by the trachea; SiO2 group exposed to SiO2 by the trachea; BLM group exposed to BLM A5 by the trachea. Each half of the animals were sacrificed on the 7th andl4th day after expoasure. The lungs of rats were collected to observe pulmonary alveolitis by HE staining and to observe fibrosis by saturated picric acid sirius red staining. The expression of tumor necrosis factor-α (TNF-α) and CD68 in pulmonary tissues were analyzed quantitatively by immunohistochmistry and image analysis system. Results (1) The alveolitis and pulmonary fibrosis of rats in both SiO2 group and BLM group were became more serious gradually over time, HE staining under light microscope showed that BLM group on the 7th day had the most obvious alveolitis (2.814±0.832), the saturated picric acid sirius red staining under polarized light showed that BLM group on the 14th day had the worst pulmonary fibrosis (1284.57±554.72), which were significantly higher than those (103.69±18.29 and 111.78±37.45) in control group and SiO2 group on the 7th day (P＜0.05). (2) The results of immunohistochmistry examination indicated that the expression (17.100±1.831) of TNF-α in the BLM group on the 7th day was significantly higher than those (0.451 ±0.441, 7.909±1.275 and 13.506±1.454) in control group, SiO2 group on 7th day and BLM group on 14th day (P＜0.05). The expression (22.778 ±2.512) of TNF-a in the SiO2 group on the 14th day was significantly higher than those in control group, SiO2 group on 7th day and BLM group on 14th day (P＜0.05).The expression (134.941 ±35.951) of CD68 in the SiO2 group on the 14th day was significantly higher than those in control group,SiO2 group on 7th day and BLM group on 14th day(P＜0.05).Conclusion The early alveolitis of BLM-induced lung injury model was more serious than that of SiO2-induced lung injury model,and the fibrosis process of BLM-induced lung injury model was earlier than that of SiO2-induced lung injury model.TNF-α plays an important role in the conrse of both models.but macrophages is involved in Si06nduced pulmonary in a more continuous way than in BLM-induced pulmonary fibrosis.