博莱霉素致大鼠肺纤维化原癌基因c-erbB2和肺表皮生长因子受体的表达

目的 探讨肺纤维化模型大鼠肺组织中原癌基因c-erbB2激活和肺表皮生长因子受体(EGFR)的表达.方法 将54只Wistar大鼠随机分成博莱霉素(BLM)组、EGFR拮抗剂Iressa组和对照组,每组18只.用BLM(5 mg/kg)气管注射制造大鼠肺纤维化模型,对照组气管注入生理盐水O.2～0.3ml;Iressa组造模前1 h灌胃给予Iressa(200 mg/kg),BLM组和对照组用生理盐水10 ml/kg灌胃,每组均灌胃5次/周,分别于第1、14、28天处死大鼠.观察大鼠肺组织病理改变,用免疫组化法检测肺组织原癌基因c-erbB2和EGFR的表达.结果 Iressa组大鼠肺组织可见纤维化并炎性细胞浸润,与BLM 组变化规律相同,肺纤维化程度低于BLM组.第28天Iressa组肺纤维化评分(2.17±0.41)明显低于BLM组(3.50±0.84),差异有统计学意义(P＜0.01).各时间点BLM组和Iressa组c-erbB2和EGFR表达均明显高于对照组,差异有统计学意义(P＜0.01).Iressa组的c-erbB2表达与BLM组变化规律一致,均随时间的延长,c-erbB2表达逐渐下降,不同时间的c-erbB2表达比较,差异有统计学意义(P＜0.01).Iressa组的c-erbB2表达与BLM组比较,差异无统计学意义(P＞0.05).Iressa组于第14、28天时肺组织中EGFR表达水平为0.17±0.02和0.28+0.04,明显低于BLM组(0.27+0.04、0.34±0.02),差异有统计学意义(P＜0.01).Iressa组第28天EGFR表达明显高于第14天,差异有统计学意义(P＜0.01).结论 c-erbB2和EGFR在大鼠肺泡炎及肺纤维化不同阶段表达增强,c-erbB2和EGFR可能参与了肺纤维化的发生.

Abstract：

Objective To study the expression of the epidermal growth factor receptor( EGFR) and the oncogene c-erbB2 on pulmonary fibrosis induced by bleomycin( BLM) in rats. Methods Fifty-four Wistar rats were randomly divided into three groups, the pulmonary fibrosis group (BLM), Iressa group and the control group. There were 18 rats in each group. Control group were injected with saline 0.2~0.3 ml in trachea.Iressa group and BLM group were injected with BLM intratracheal. After the fibrosis models were build, Iressa group were given orally Iressa(200 mg/kg)l h before modeling in Iressa group, saline were fed 10 ml/kg in BLM group and control group. The three groups were fed 5 times per week; and were sacrificed after treatment on days 1, 14and 28 respectively. The lungs were harvested for histological studies. Results The lung tissue in Iressa group showed fibrosis and inflammatory cell infiltration, the same as shown in the BLM group. The pulmonary fibrosis score was significantly lower than the BLM group on the 28 th day (2.17±0.41 vs 3.50±0.84, P＜0.01). Compared with the control group, c-erbB2 and EGFR were hyperexpressed significantly both in BLM group and Iressa group at all time points (P＜0.01); c-erbB2 expression had no changes between the Iressa group and the BLM (P＞0.05), that were gradually decreased, and was significantly different at each time point (P＜0.01). EGFR expression was increased gradually on the 14th and 28th day (0.17±0.02 and 0.28±0.04)in Iressa group ,that was significantly lower than the BLM group (0.27±0.04 and 0.34±0.02)(P＜0.01). EGFR expression increased significantly on the 28th day than on the 14th day in the Iressa group(P＜0.01). Conclusion The expression of C-erbB2 and EGFR are enhanced in different stages of alveolitis and pulmonary fibrosis, c-erbB2 and EGFR may be participated in different stages of pulmonary fibrosis.

Expression of epidermal growth factor receptor and the oncogene c-erbB2 on pulmonary fibrosis induced by bleomycin in rats

Objective To study the expression of the epidermal growth factor receptor( EGFR) and the oncogene c-erbB2 on pulmonary fibrosis induced by bleomycin( BLM) in rats. Methods Fifty-four Wistar rats were randomly divided into three groups, the pulmonary fibrosis group (BLM), Iressa group and the control group. There were 18 rats in each group. Control group were injected with saline 0.2~0.3 ml in trachea.Iressa group and BLM group were injected with BLM intratracheal. After the fibrosis models were build, Iressa group were given orally Iressa(200 mg/kg)l h before modeling in Iressa group, saline were fed 10 ml/kg in BLM group and control group. The three groups were fed 5 times per week; and were sacrificed after treatment on days 1, 14and 28 respectively. The lungs were harvested for histological studies. Results The lung tissue in Iressa group showed fibrosis and inflammatory cell infiltration, the same as shown in the BLM group. The pulmonary fibrosis score was significantly lower than the BLM group on the 28 th day (2.17±0.41 vs 3.50±0.84, P＜0.01). Compared with the control group, c-erbB2 and EGFR were hyperexpressed significantly both in BLM group and Iressa group at all time points (P＜0.01); c-erbB2 expression had no changes between the Iressa group and the BLM (P＞0.05), that were gradually decreased, and was significantly different at each time point (P＜0.01). EGFR expression was increased gradually on the 14th and 28th day (0.17±0.02 and 0.28±0.04)in Iressa group ,that was significantly lower than the BLM group (0.27±0.04 and 0.34±0.02)(P＜0.01). EGFR expression increased significantly on the 28th day than on the 14th day in the Iressa group(P＜0.01). Conclusion The expression of C-erbB2 and EGFR are enhanced in different stages of alveolitis and pulmonary fibrosis, c-erbB2 and EGFR may be participated in different stages of pulmonary fibrosis.