脆性组氨酸三联体(FHIT)通过阻断PI3K-Akt信号通路抑制胆管癌细胞增殖并促进其凋亡。

Fragile histidine triad (FHIT) suppresses proliferation and promotes apoptosis in cholangiocarcinoma cells by blocking PI3K-Akt pathway.

作者信息

Huang Qiang, Liu Zhen, Xie Fang, Liu Chenhai, Shao Feng, Zhu Cheng-lin, Hu Sanyuan

机构信息

Department of General Surgery, Qilu Hospital of Shandong University, No. 107 Wenhuaxi Road, Jinan 250012, China.

Department of General Surgery, Anhui Provincial Hospital Affiliated with Anhui Medical University, Hefei, Anhui 230001, China ; Hepatic-Biliary-Pancreatic Key Laboratory of Anhui Province, Hefei, Anhui 230001, China.

出版信息

ScientificWorldJournal. 2014 Mar 16;2014:179698. doi: 10.1155/2014/179698. eCollection 2014.

Abstract

Fragile histidine triad (FHIT) is a tumor suppressor protein that regulates cancer cell proliferation and apoptosis. However, its exact mechanism of action is poorly understood. Phosphatidylinositol 3-OH kinase (PI3K)-Akt-survivin is an important signaling pathway that was regulated by FHIT in lung cancer cells. To determine whether FHIT can regulate this pathway in cholangiocarcinoma QBC939 cells, we constructed an FHIT expression plasmid and used it to transfect QBC939 cells. Protein and mRNA expression were measured by western blotting and qRT-PCR, respectively. The viability and apoptosis of QBC939 cells were then assessed using MTT assays and flow cytometry. Our results revealed that the expression of survivin and Bcl-2 was downregulated, and caspase 3 was upregulated, in cells overexpressing FHIT. In addition, FHIT suppressed the phosphorylation of Akt. The changes in cell proliferation and apoptosis were obvious in cells overexpressing FHIT which parallels that of treatment with LY294002, a potent inhibitor of phosphoinositide 3-kinases. Treatment with LY294002 further decreased the expression of survivin and Bcl-2 and increased caspase-3 levels. These results suggest that FHIT can block the PI3K-Akt-survivin pathway by suppressing the phosphorylation of Akt and the expression of survivin and Bcl-2 and upregulating caspase 3.

摘要

脆性组氨酸三联体(FHIT)是一种肿瘤抑制蛋白,可调节癌细胞的增殖和凋亡。然而,其确切的作用机制尚不清楚。磷脂酰肌醇3-羟基激酶(PI3K)-Akt-生存素是肺癌细胞中受FHIT调节的一条重要信号通路。为了确定FHIT是否能在胆管癌QBC939细胞中调节该通路,我们构建了FHIT表达质粒并用其转染QBC939细胞。分别通过蛋白质印迹法和qRT-PCR检测蛋白质和mRNA表达。然后使用MTT法和流式细胞术评估QBC939细胞的活力和凋亡情况。我们的结果显示,在过表达FHIT的细胞中,生存素和Bcl-2的表达下调,而半胱天冬酶3上调。此外,FHIT抑制了Akt的磷酸化。过表达FHIT的细胞中细胞增殖和凋亡的变化明显,这与用磷酸肌醇3激酶的强效抑制剂LY294002处理的情况相似。用LY294002处理进一步降低了生存素和Bcl-2的表达,并提高了半胱天冬酶-3的水平。这些结果表明,FHIT可通过抑制Akt的磷酸化、生存素和Bcl-2的表达以及上调半胱天冬酶3来阻断PI3K-Akt-生存素通路。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8696/3976809/8084b8fad774/TSWJ2014-179698.001.jpg

引用本文的文献

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索