Gastroenterology:关新元教授发现OSGIN1与肝癌进展有关

2014-01-23 佚名 不详

来自香港大学、新加坡国立大学和中山大学的研究人员证实,氧化应激诱导生长抑制因子1(OSGIN1)等位基因失衡与肝癌的进展相关。这一研究发现于1月10日发表在国际胃肠病学杂志(,IF 11.675)上。 任职于香港大学和中山大学肿瘤防治中心的关新元(Xin-Yuan Guan)教授是这篇论文的通讯作者。其主要研究领域包括肿瘤发生发展相关基因、肿瘤干细胞及肿瘤微环境等。在

来自香港大学、新加坡国立大学和中山大学的研究人员证实,氧化应激诱导生长抑制因子1(OSGIN1)等位基因失衡与肝癌的进展相关。这一研究发现于1月10日发表在国际胃肠病学杂志(,IF 11.675)上。 【原文下载】

任职于香港大学和中山大学肿瘤防治中心的关新元(Xin-Yuan Guan)教授是这篇论文的通讯作者。其主要研究领域包括肿瘤发生发展相关基因、肿瘤干细胞及肿瘤微环境等。在国际SCI收录的杂志上共发表学术论文104篇。

肝细胞癌(HCC)是全世界最常见的癌症类型之一,全球每年有超过50万新患者,严重地危害着人们的身体健康。我国是肝癌高发国家,每年约有11万人死于肝癌,其死亡率在我国十大恶性肿瘤的排名中已从第三位上升到第二位。肝癌的预防和治疗是世界性难题,至今仍缺乏有效治疗手段。探讨遗传变异与肝癌发生发展之间的关系,寻找肝癌相关基因对于开发出更有效的治疗策略,改善疾病结局具有重要意义。

为了寻找与肝癌发病机制相关的遗传变异,在这篇文章中研究人员结合临床信息,对来自肝癌患者的400对肝癌和邻近非肿瘤组织进行了RNA序列分析。所有这些患者均在中山大学接收了手术治疗。从组织中抽提总RNA并进行测序,研究人员鉴别了具有等位基因失衡的变异。随后研究人员在肝癌细胞系和小鼠肿瘤移植物中调查了这些变异对于细胞功能的影响。 研究人员发现一些与细胞应激有关的基因有高比例的等位基因失衡。OSGIN1基因的一个核苷酸变异(nt 1494: G-A)导致了一个氨基酸置换(codon 438: Arg-His)。这一OSGIN1变异形式特异性地存在于肿瘤组织中。功能分析揭示,常见OSGIN1形式发挥肿瘤抑制因子功能,可通过诱导凋亡使得肝癌细胞对化疗药物敏感。而变异则使得OSGIN1丧失了这一效力。它似乎影响了OSGIN1从细胞核易位到线粒体,这对于它的凋亡功能至关重要。

相比于邻近的肝组织,OSGIN1在肝癌样本中的表达模式和定位均发生了改变。在肝癌样本中OSGIN1 mRNA水平下降了24.7%,且OSGIN1下调与患者总生存时间和无病生存时间缩短有关。在整个患者亚群中携带OSGIN1 1494A变异的患者平均生存时间最短(32.68个月),他们的肿瘤样本具有最低的细胞凋亡指数。

新研究确定了OSGIN1是一个肿瘤抑制因子,其在人类肝癌中表达下调或是发生了改变。在肝癌样品中检测到OSGIN1变异减少了凋亡,与患者生存期缩短有关。

原文出处:

Liu M1, Li Y1, Chen L2, Man Chan TH2, Song Y1, Fu L1, Zeng TT3, Dai YD3, Zhu YH3, Li Y3, Chen J1, Yuan YF3, Guan XY4.Allele-specific Imbalance of Oxidative Stress-Induced Growth Inhibitor 1 Associates With Progression of Hepatocellular Carcinoma.Gastroenterology. 2014 Jan 10. pii: S0016-5085(14)00025-0. doi: 10.1053/j.gastro.2013.12.041. 【原文下载】

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    2014-08-21 许安
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