胰岛素样生长因子1受体在食管鳞癌组织中的表达及RNA干扰沉默其表达对EC9706细胞增殖能力的影响

目的 探讨胰岛素样生长因子1受体(IGF-1R)在食管鳞癌组织中的表达及其与患者临床特征之间的关系,以及RNA干扰沉默其表达对人食管癌EC-9706细胞体外增殖能力的影响.方法 采用免疫组化法,检测80例食管鳞癌组织和18例正常食管上皮组织中IGF-1R的表达,通过RNA干扰技术沉默EC9706细胞中IGF-1R的表达,通过绘制生长曲线、四甲基偶氮唑蓝(MTT)实验和平板克隆形成试验,观察IGF-1R对细胞体外增殖能力的影响.结果 食管鳞癌组织中IGF-1R表达的总阳性率为86.3%,强阳性率为51.3%;正常食管上皮组织中IGF-1R表达的总阳性率为61.1%,强阳性率为11.1%.食管鳞癌组织中IGF-1R表达的总阳性率和强阳性率均高于正常食管组织(P＜0.01).有淋巴结转移患者组织中IGF-1R表达的总阳性率和强阳性率均高于无淋巴结转移患者(P＜0.01).IGF-1R的表达随肿瘤组织分化程度的增高而降低,差异均有统计学意义(均P＜0.05).不同年龄组间IGF-1R表达差异无统计学意义(均P＞0.05).Ⅲ～Ⅳ期患者组织中IGF-IR表达的总阳性率和强阳性率均高于Ⅰ～Ⅱ期患者(P＜0.01).稳定干扰后的EC9706细胞IGF-1R蛋白表达下降,生长缓慢,细胞倍增时间较实验对照组和空白对照组延长.培养48 h后,稳定转染细胞抑制率为17.3%,高于实验对照组(2.7%,P＜0.01).稳定转染细胞较实验对照组和空白对照组细胞克隆形成能力减弱(P＜0.05).结论 IGF-1R在食管鳞癌组织中呈高表达,与食管鳞癌的发生、转移、分化程度和临床分期相关;RNA干扰沉默IGF-IR的表达,可以使EC9706细胞的体外增殖能力降低.

Abstract：

Objective To explore the correlation of IGF-1R expression with clinical features of esophageal squamous cell carcinoma (ESCC) and to investigate the effect of silencing IGF-1R by siRNA on the proliferation of esophageal cancer cell line EC9706 cells. Methods Immunohistochemistry was used to detect the expresion of IGF-1R in 80 specimens of ESCC and 18 specimens of normal esophageal mucosa.IGF-I R siRNA was transfected into esophageal squamous cell carcinoma EC9706 cells, and the effect of RNAi was assessed by Western blot. The proliferation of EC9706 cells was determined by drawing growth curve, MTT assay and plate colony-forming assay. Results The total and strong positive rates of IGF-1R expression were 86.3% and 51.3% in ESCC, and 61.1% and 11.1% in normal esophageal epithelium,respectively. The total and strong positive rates of IGF-1 R expression in patients with lymph node metastasis were 94.4% and 74.1%, significantly higher than 69.2% and 3.9%, respectively, in those without lymph node metastasis (P ＜ 0. 01 ). A significantly higher IGF-1 R expression was associated with lower histological grade ( P ＜ 0.05 ). The total and strong rates of IGF-1 R expression in 39 patients of stages Ⅲ and Ⅳ were 97.4% and 71.8%, significantly higher than the 75.6% and 31.7%, respectively, in 41 cases of stages Ⅰ and Ⅱ (P ＜ 0. 01 ). IGF-1 R RNAi significantly inhibited IGF-1R expression and the growth of EC9706cells. The clone formation rate of RNAi-IGF-1R transfected cells was 19.1%, significantly lower than that of 52. 3% in non-transfected cells and 49.0% in empty vector-transfected EC9706 cells ( P ＜ 0.05 ).Conclusions The overexpression of IGF-1R is colerated with lymph node metastasis, differentiation and clinical stage. Down-regulation of IGF-1R can inhibit the proliferation of esophageal cancer EC9706 cells in vitro.

Expression of IGF-1R in esophageal squamous cell carcinoma and the effect of its silencing by siRNA on the proliferation of esophageal cancer EC9706 cells in vitro

Objective To explore the correlation of IGF-1R expression with clinical features of esophageal squamous cell carcinoma (ESCC) and to investigate the effect of silencing IGF-1R by siRNA on the proliferation of esophageal cancer cell line EC9706 cells. Methods Immunohistochemistry was used to detect the expresion of IGF-1R in 80 specimens of ESCC and 18 specimens of normal esophageal mucosa.IGF-I R siRNA was transfected into esophageal squamous cell carcinoma EC9706 cells, and the effect of RNAi was assessed by Western blot. The proliferation of EC9706 cells was determined by drawing growth curve, MTT assay and plate colony-forming assay. Results The total and strong positive rates of IGF-1R expression were 86.3% and 51.3% in ESCC, and 61.1% and 11.1% in normal esophageal epithelium,respectively. The total and strong positive rates of IGF-1 R expression in patients with lymph node metastasis were 94.4% and 74.1%, significantly higher than 69.2% and 3.9%, respectively, in those without lymph node metastasis (P ＜ 0. 01 ). A significantly higher IGF-1 R expression was associated with lower histological grade ( P ＜ 0.05 ). The total and strong rates of IGF-1 R expression in 39 patients of stages Ⅲ and Ⅳ were 97.4% and 71.8%, significantly higher than the 75.6% and 31.7%, respectively, in 41 cases of stages Ⅰ and Ⅱ (P ＜ 0. 01 ). IGF-1 R RNAi significantly inhibited IGF-1R expression and the growth of EC9706cells. The clone formation rate of RNAi-IGF-1R transfected cells was 19.1%, significantly lower than that of 52. 3% in non-transfected cells and 49.0% in empty vector-transfected EC9706 cells ( P ＜ 0.05 ).Conclusions The overexpression of IGF-1R is colerated with lymph node metastasis, differentiation and clinical stage. Down-regulation of IGF-1R can inhibit the proliferation of esophageal cancer EC9706 cells in vitro.