摘要
目的探讨变异型IkBα(IkBαM)基因对人类多形性胶质母细胞瘤(GBM)细胞中促红细胞生成素(Epo)和其受体(EpoR)表达的调控作用及其与肿瘤血管新生的关系。方法建立稳定表达IkBαM的人类GBM细胞株并制作裸鼠皮下异位移植瘤生长模型,采用免疫组织化学法分析肿瘤组织中Epo、EpoR和FactorⅧ的表达,同时分析肿瘤组织中的微血管密度以及运用流式细胞术分析凋亡率。结果各组肿瘤组织中,Epo的阳性细胞表达率分别为(54.8±12.4)%(G36A组)、(65.7±15.6)%(G36△—W组)、(6.1±10.1)%(G36△—M组)和(68.3±11.4)%(G36△—P组);EpoR的阳性表达率分别为(33.6±16.4)%(G36A组)、(37.3±13.9)%((G365△W组)、(2.5±17.5)%(G36△—M组)和(37.2±14.4)%(G36△-P组)。Epo和EpoR在G36△—M组中的表达显著低于其他三组,而在后三组间的表达差异无统计学意义。各肿瘤组织中肿瘤细胞凋亡率分别为(8.31±1.85)%(G36△组)、(8.06±2.08)%(G36△—W组)、(28.35±3.26)%(G36A-M组)及(7.40±2.35)%(G36△—P组),G36△—M组中的肿瘤细胞凋亡率明显高于其他三组;而G36△—M组中的微血管密度明显低于其他各组。结论IkBαM基因可显著降低人类恶性胶质瘤中Epo和EpoR的表达,进而减弱肿瘤细胞的促血管新生的能力,促进肿瘤细胞凋亡,从而抑制肿瘤组织的生长。
Objective To investigate the regulation of mutant-type IkBα (IkBαM) to Erythropoietin (Epo) and its receptor (EpoR) in human glioblastoma multiform (GBM) cells, and the correlation to tumor angiogenesis. Methods Human GBM cell line which steadily express IkBαM protein was established, and then subcutaneously injected into nude mice. The expression of Epo, EpoR and FactorⅧ was detected by immunohistochemistry method, the microvasculer density (MVD) analyzed, and the apoptosis rate tested by using flow cytometry (FCM). Results The positive expression rate of Epo was (54.8 ± 12.4) % ( G36△ group), (65.7±15.6) % ( G36△-W group), (6.1 ±10.1 ) % ( G36△-M group) and (68.3 ± 11.4) % ( G36△-P group), while that of EpoR ( 33.6± 16.4) % ( G36A group), ( 37.3 ± 13.9)% (G36△-W group), (2. 5 ± 17.5)% (G36△-M group),and (37.2± 14.4)% (G36A-P group), respectively. The expression of Epo and EpoR was decreased significantly in G36△-M group in vivo,but the remaining three groups (G36△-W,G36A-P and G36△) almost had the same tread. The apoptosis rate was (8.31±1.85)% (G36△ group) ,(8.06 ±2.08)% (G36△-W group) ,(28.35 ±3.26)% ( G36△-M group) , and (7.40 ± 2.35 ) % ( G36△-P group) respectively. The apoptosis rate was increased obviously in G36△-M group. The MVD was decreased obviously in G36△-M group. Conclusion IkBαM gene could down-regulate the expression of Epo and EpoR proteins in the human GBM cell line, reduce the ability of tumor angiogenesis and promote apoptosis of tumor cells, and suppresse tumor growth.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2009年第4期477-479,共3页
Chinese Journal of Experimental Surgery
基金
河北省自然科学基金资助项目(C2006000910)
河北省科技厅博士基金资助项目(06547009D-12)