| 摘要: |
| 目的 利用细胞穿膜肽PEP-1介导重组肝细胞核因子4α(HNF4α)蛋白进入肝癌细胞,并明确外源融合蛋白P-HNF4α对肝癌细胞的作用。方法 构建表达质粒pET28a-P-HNF4α,优化原核表达体系的诱导条件,经大量表达、亲和层析纯化及浓缩、透析后获得纯度较高的带有细胞穿膜肽PEP-1的融合蛋白P-HNF4α;P-HNF4α转导人肝癌细胞,蛋白质印迹法检测其穿膜效率,核质分离和细胞免疫荧光检测P-HNF4α的亚细胞定位,Real-time PCR检测肝癌细胞基因表达,CCK-8法检测肝癌细胞增殖,细胞划痕实验及小室侵袭实验检测P-HNF4α对肝癌细胞转移能力的影响。结果 细胞穿膜肽PEP-1成功介导融合蛋白P-HNF4α进入Huh7细胞并定位于细胞核;P-HNF4α蛋白可促进Huh7细胞肝功能基因表达,抑制干细胞相关基因表达(P<0.05或0.01),并显著抑制肝癌细胞增殖(P<0.05)、迁移(P<0.001)和侵袭(P<0.05)能力。结论 P-HNF4α可诱导肝癌细胞向成熟肝细胞分化,降低肝癌细胞的恶性程度,是诱导分化治疗肝癌的潜在手段。 |
| 关键词: 肝细胞癌 肝细胞核因子4α 细胞穿膜肽 PEP-1 |
| DOI：10.3724/SP.J.1008.2015.00929 |
| 投稿时间：2014-12-17修订日期：2015-07-31 |
| 基金项目:国家自然科学基金(81372675),国家科技重大专项(2013ZX10002007-007). |
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| Inhibitory effect of PEP-1-mediated recombinant hepatocyte nuclear factor 4 alpha transduction on hepatocellular carcinoma cells |
| DENG Long-fei1,DING Chen-hong2,XIE Wei-fen2,ZHANG Xin1,2* |
(1. School of Biotechnology, East China University of Science and Technology, Shanghai 200237, China;
2. Department of Gastroenterology, Changzheng Hospital, Second Military Medical University, Shanghai 200003, China
*Corresponding author) |
| Abstract: |
| Objective To investigate cell penetrating peptide (PEP-1)-mediated transduction of recombinant hepatocyte nuclear factor 4 alpha (HNF4α) protein into hepatocellular carcinoma (HCC) cells, and to observe the effect of the fusion protein P-HNF4α on HCC cells. Methods The expression vector pET28a-P-HNF4α was constructed. The prokaryotic expression condition of fusion protein P-HNF4α was optimized. Recombinant P-HNF4α carrying cell penetrating peptide PEP-1 was obtained by abundant expression, purified by affinity chromatography, and was concentrated and dialyzed. P-HNF4α was transduced into HCC cells. The transduction efficiency was analyzed by Western blotting analysis. Sub-cellular localization of P-HNF4α was detected by Western blotting analysis with nuclear and cytoplasmic extracts and confirmed by immunofluorescence assay. Real-time RT-PCR was used to examine the gene expression of HCC cells. The proliferation of HCC cells was detected with CCK-8 kit. The migration and invasion of HCC cells were detected by wound-healing assay and trans-well invasion assay, respectively. Results P-HNF4α was efficiently transduced into Huh7 cells and located in the nucleus as mediated by PEP-1. P-HNF4α significantly up-regulated the expression of characteristic hepatocyte markers and down-regulated the "stemness" genes in Huh7 cells (P<0.05 or P<0.01). Moreover, the proliferation (P<0.05), migration (P<0.001) and invasion (P<0.05) of HCC cells were significantly suppressed by fusion protein P-HNF4α. Conclusion P-HNF4α can induce the differentiation of HCC cells to mature hepatocytes and reduce the malignancy phenotype of HCC cells, suggesting that PEP-1-mediated HNF4α protein transduction may be a potential strategy for HCC differentiation therapy. |
| Key words: hepatocellular carcinoma hepatocyte nuclear factor-4 alpha cell penetrating peptide PEP-1 |
