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Expression of IQGAP2 and its clinical significance in hepatocellular carcinoma
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- Author:
- No author available
- Journal Title:
- WORLD CHINESE JOURNAL OF DIGESTOLOGY
- Issue:
- 12
- DOI:
- 10.3969/j.issn.1009-3079.2008.12.010
- Key Word:
- 肝细胞肝癌;含IQ模体的GTP酶活化蛋白2;甲胎蛋白;癌变机制;免疫荧光;免疫组化;免疫印迹
Abstract： 目的:认识肝细胞肝癌中含IQ模体的GTP酶活化蛋白2(IQ motif containing GTPase activating protein 2,IQGAP2)的亚细胞定位和表达,及其在肝细胞肝癌(hepatocellular carcinoma,HCC)中的作用.方法:分别通过Western blot、免疫荧光和免疫组织化学染色分析IQGAP2在7种人肝癌细胞与正常肝细胞系中的表达、定位,及其在HCC组织样本中的表达与分布.结果:IOGAP2在Bel-7402、Bel-7404、SMMC-7721、SK-HEP-1、HLE和HL-7702等肝癌和正常成人肝细胞系中不表达,仅在HepG2和Hep3B等2种甲胎蛋白(AFP)表达阳性的人肝癌细胞系中表达,IQGAP2主要分布于细胞质,此外,在HepG2细胞中还具有明显的核膜和核仁定位,IQGAP2在HCC组织中表达降低(56.9%,29/51).其中,19例配对HCC组织的IQGAP2表达与肿瘤大小,AJCC分期和血清AFP水平相关(P=0.020,P=0.017,P=0.002);38例配对组织IQGAP2在肿瘤和癌旁正常肝组织中主要定位于胞质,部分细胞伴有胞核和胞膜定位,但是,IQGAP2的表达与肿瘤大小、分化程度、AJCC分期以及血清AFP表达水平无相关性.结论:IQGAP2蛋白可能参与细胞黏附、信号转导等过程,在肝癌的发生发展中发挥重要作用,是一种潜在的抑癌基因.
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