首页 > 范文大全 > 正文

IGF—ⅠR信号通路在西妥昔单抗抗HepG2细胞增殖中的作用

开篇:润墨网以专业的文秘视角,为您筛选了一篇IGF—ⅠR信号通路在西妥昔单抗抗HepG2细胞增殖中的作用范文,如需获取更多写作素材,在线客服老师一对一协助。欢迎您的阅读与分享!

[摘要] 目的 探讨igf—ⅠR信号通路西妥昔单抗hepg2细胞增殖中的作用。 方法 选用浓度递增的西妥昔单抗(5~500) mg/mL、胰岛素样生长因子(IGF)(2.5~250) μmol/L及其抑制剂aIR3(2.5~250) μmol/L,单独或联合作用于HepG2细胞,观察IGF与aIR3对西妥昔单抗抗HepG2增殖的影响。 结果 细胞培养72 h后,单药西妥昔单抗对HepG2细胞增殖的抑制作用呈浓度依赖性,西妥昔单抗联合aIR3组增殖抑制率在相应浓度下均显著高于同浓度的西妥昔单抗组(均为P < 0.01),IGF(10~250) μmol/L与西妥昔单抗(20~500) mg/mL联合组增殖抑制率均显著低于相应浓度的西妥昔单抗组(均为P < 0.01)。 结论 IGF—ⅠR通路可影响西妥昔单抗抗HepG2细胞增殖的作用,可能是肝癌细胞株对西妥昔单抗耐药的机制之一。

[关键词] 肝癌细胞株;表皮生长因子受体;西妥昔单抗;胰岛素样生长因子—Ⅰ受体

[中图分类号] R735.7 [文献标识码] A [文章编号] 1673—9701(2012)25—0002—03

Role of IGF—ⅠR signaling pathway in the anti—proliferation of cetuximab to HepG2 cells

HAN Chunfan1 CHEN Yingrong2 CAI Weilong1 XIE Zhonghai1 WANG Yan1 SHEN Hua1 MIN Lishan2 WEI Feng1 DAI Licheng2

1.Department of Surgery, Huzhou Central Hospital, Huzhou 313000, China; 2.Huzhou Key Laboratory of Molecular Medicine, Huzhou 313000, China

[Abstract] Objective To investigate the role of IGF—ⅠR signaling pathway in the anti—proliferation of cetuximab to HepG2 cells. Methods Increasing concentrations of cetuximab (5—500) mg/mL, insulin—like growth factor (IGF) (2.5—250) μmol/L and its inhibitor aIR3 (2.5—250) μmol/L, alone or in combination were administrated to HepG2 cells. The inhibitory effects of the drugs on cell proliferation were observed. Results After 72 h cell culture, the single agent of cetuximab inhibited the proliferation of HepG2 cells in a dose—dependent manner. The growth inhibition rates of cetuximab combined aIR3 group at the corresponding concentrations were significantly higher than that of cetuximab group (all P < 0.01). However, the proliferation inhibition rates of IGF (10—250) μmol/L combined cetuximab (20—500) mg/mL were significantly lower than that of cetuximab group (all P < 0.01). Conclusion IGF—ⅠR pathway can affect the anti—proliferation of cetuximab to HepG2 cells, which may be one of the mechanisms of hepatocellular carcinoma cell lines resistance to cetuximab.

[Key words] Hepatocellular carcinoma cell lines; Epidermal growth factor receptor; Cetuximab; Insulin—like growth factor—Ⅰ receptor

原发性肝癌是我国常见的恶性肿瘤之一,恶性程度与死亡率均很高。外科手术是其主要治疗方法,但术后易复发转移,传统的放、化疗疗效不佳,因此总体临床疗效不满意。生物靶向治疗为恶性肿瘤提供了新的治疗手段。表皮生长因子受体(epidermal growth factor receptor,EGFR)几乎在所有实体瘤中均有表达。肝癌细胞中同样有EGFR的过表达,并常与肝癌侵袭、转移、放化疗抗性等生物学特性有密切关系。研究发现,EGFR抑制剂如西妥昔单抗对肝癌细胞具有明显的体内外抑制作用[1]。但部分患者对此类药物无明显效果,部分患者最终产生耐药,尽管机制并不完全明确[2],其中胞内许多不同信号通路的改变是产生耐药性的重要机制,而胰岛素样生长因子—Ⅰ受体(insulin—like growth factor—Ⅰreceptor,IGF—ⅠR)通路则是其中重要的信号通路[3]。本文通过在西妥昔单抗抑制人肝癌细胞株HepG2增殖的实验体系中,分别加入促进或抑制IGF—ⅠR信号通路的试剂,探讨IGF—ⅠR信号通路在前者中的作用。