Oncogene:ANGPTL4在泌尿上皮癌中的双重角色。

2017-10-19 fengxiangxin MedSci原创

泌尿上皮癌(UC)的致癌被认为是因肿瘤抑制基因(TSGs)的表观遗传受到抑制而发生。通过定量实时聚合酶链反应(PCR)阵列,研究者发现一个潜在的TSG,血管生成素样蛋白4(ANGPTL4),其在作者所检测的所有膀胱癌细胞系中表达水平均非常低。

泌尿上皮癌(UC)的致癌被认为是因肿瘤抑制基因(TSGs)的表观遗传受到抑制而发生。通过定量实时聚合酶链反应(PCR)阵列,研究者发现一个潜在的TSG,血管生成素样蛋白4(ANGPTL4),其在作者所检测的所有膀胱癌细胞系中表达水平均非常低。

以前的研究表明ANGPTL4在一些癌症中高度表达,但在其他一些癌症中却通过DNA甲基化下调。由于ANGPTL4在不同癌症中表现出似乎相互矛盾的功能,其在泌尿上皮癌(UC)病因学中的确切作用尚不清楚。

在本研究中,通过使用甲基化特异性PCR和亚硫酸氢盐处理焦磷酸测序,研究者发现与相邻的非癌性膀胱上皮相比,ANGPTL4转录在UC细胞系和原发肿瘤标本中通过DNA甲基化被抑制。功能研究进一步证实,ANGPTL4的异位表达能够有效抑制UC细胞增殖、体外单层细胞集落的形成、体内侵袭和迁移能力和移植瘤的形成。

令人惊讶的是,来自UC患者的血浆样品中的ANGPTL4显著高于正常对照者,表明它可能是由其他细胞类型分泌而来。有趣的是,数据还表明外源性cANGPTL4可以通过Erk /粘著斑激酶轴激活信号传导来促进细胞增殖和细胞迁移。

研究者通过进一步实验证实,外源性cANGPTL4可以促进小鼠异种移植瘤的生长。最后,免疫组化证实,ANGPTL4在肿瘤细胞中下调,但是在肌肉浸润性UC组织样本中,在肿瘤相邻的间质组织中过度表达。

总之,作者的数据支持ANGPTL4在UC进展中因微环境的不同而作为肿瘤抑制因子或致癌基因的双重角色。

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    2018-01-06 cy0324
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