circRAD18/miR-516b/PDK1轴调节葡萄糖代谢重编程与结直肠癌增殖的关系
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1.湖南省永州市中心医院 肛肠疝外科,湖南 永州 425006;2.永州职业技术学院 公共基础学部,湖南 永州 425100

作者简介:

李威,湖南省永州市中心医院主治医师,主要从事胃肠道方面的研究。

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Relationship between the glucose metabolism reprogramming regulation by the circRAD18/miR-516b/PDK1 axis and proliferation in colorectal cancer cells
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1.Department of Anorectal Hernia Surgery, Yongzhou Central Hospital, Yongzhou, Hunan 425006, China;2.Department of Public Fundamentals, Yongzhou Vocational and Technical College, Yongzhou, Hunan 425100, China

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    摘要:

    背景与目的 环状RNA circRAD18被发现在乳腺癌和甲状腺癌的进展中起了促进作用,但其在其他恶性肿瘤的表达及作用尚未被充分揭示。笔者前期通过生物信息学软件预测circRAD18可与miR-516b互补结合,而葡萄糖代谢关键调节酶丙酮酸脱氢酶激酶1(PDK1)可能是miR-516b的靶基因。因此,本研究初步探讨circRAD18在结直肠癌细胞中的表达及作用,及其对靶miRNA及下游靶基因的调控关系。方法 用qRT-PCR检测不同结直肠癌细胞系(SW480、SW620、HT-29)及正常结直肠上皮细胞(NCM460)中circRAD18的表达;用si-circRAD18沉默结直肠癌细胞中circRAD18的表达后,分别用CCK-8实验和相应的试剂盒检测细胞的增殖情况以及葡萄糖摄取量和乳酸产生量。用双荧光素酶报告基因实验与RNA免疫沉淀(RIP)实验分析circRAD18、miR-516b及PDK1之间的结合关系;最后,采用过表达/敲低实验进一步验证三者之间的关系。结果 与正常结直肠上皮细胞比较,circRAD18在各结直肠癌细胞系中的表达均明显上调(均P<0.05);转染si-circRAD18后,结直肠癌细胞增殖能力、葡萄糖摄取及乳酸产生量均明显降低(均P<0.05);双荧光素酶报告基因实验与RIP实验证实circRAD18可与miR-516b结合,而PDK1是miR-516b的下游靶基因。miR-516b模拟物及si-circRAD18的转染可明显抑制细胞葡萄糖摄取、乳酸产生及PDK1蛋白表达,且补充PDK1可逆转该抑制作用(均P<0.05)。结论 circRAD18在结直肠癌细胞中表达上调,并与结直肠癌细胞增殖能力的增强密切相关,作用机制可能与circRAD18通过海绵样吸附miR-516b后,上调PDK1表达,从而导致结直肠癌细胞葡萄糖代谢重编程有关。

    Abstract:

    Background and Aims Circular RNA circRAD18 has been found to play a promoting role in the progression of breast cancer and thyroid cancer, but its expression and function in other malignant tumors have not been fully elucidated. In our previous study, we used bioinformatics software to predict that circRAD18 can interact with miR-516b through complementary binding, and pyruvate dehydrogenase kinase 1 (PDK1), a key regulator of glucose metabolism, may a target gene of miR-516b. Therefore, this study was conducted to preliminarily investigate the expression and function of circRAD18 in colorectal cancer cells and its regulatory relationship with the target miRNA and downstream target genes.Methods The expression of circRAD18 in different colorectal cancer cell lines (SW480, SW620, HT-29) and normal colorectal epithelial cells (NCM460) was detected using qRT-PCR. After silencing circRAD18 with si-circRAD18 in colorectal cancer cells, cell proliferation, glucose uptake, and lactate production were assessed using CCK-8 assay and corresponding kits. The binding relationship between circRAD18, miR-516b, and PDK1 was analyzed through dual-luciferase reporter gene assay and RNA immunoprecipitation (RIP) experiment. Finally, overexpression and knockdown experiments were conducted to further validate the relationships among them.Results Compared to normal colorectal epithelial cells, circRAD18 was significantly upregulated in all colorectal cancer cell lines (all P<0.05). Transfection with si-circRAD18 resulted in a significant decrease in colorectal cancer cell proliferation, glucose uptake, and lactate production (all P<0.05). Dual-luciferase reporter gene assay and RIP experiments confirmed the binding of circRAD18 to miR-516b, and PDK1 was identified as a downstream target gene of miR-516b. Transfection with miR-516b mimic or si-circRAD18 significantly inhibited cellular glucose uptake, lactate production, and PDK1 protein expression in colorectal cancer cells, and the supplementation of PDK1 could reverse this inhibitory effect (all P<0.05).Conclusions CircRAD18 is upregulated in colorectal cancer cells and is closely associated with enhanced cell proliferation. The underlying mechanism may involve circRAD18 adsorbing miR-516b through sponge uptake, leading to upregulation of PDK1 expression, and subsequently, reprogramming of glucose metabolism in colorectal cancer cells.

    表 1 Table 1
    图1 circRAD18在结直肠癌中的表达及功能 A:circRAD18在结直肠癌细胞系中的相对表达;B:转染si-circRAD18后的沉默效能分析;C:CCK-8检测细胞增殖;D:细胞葡萄糖摄取量检测;E:细胞乳酸产生量检测Fig.1 Expression and function of circRAD18 in colorectal cancer A: Relative expression of circRAD18 in colorectal cancer cell lines; B: Analysis of silencing efficiency after transfection with si-circRAD18; C: Cell proliferation assessment using CCK-8 assay; D: Measurement of cellular glucose uptake; E: Measurement of cellular lactate production
    图2 circRAD18与miR-516b的关系 A:细胞不同部位中circRAD18、RAD18 mRNA、GAPDH和18S的相对比例;B:circRAD18序列中miR-516b的预测结合位点;C:双荧光素酶报告基因实验检测miR-516b模拟物和circRAD18之间的相互作用;D:MS2相关的RIP实验验证结合关系Fig.2 Relationship between circRAD18 and miR-516b A: Relative proportions of circRAD18, RAD18 mRNA, GAPDH, and 18S in different cellular compartments; B: Predicted binding sites of miR-516b in the circRAD18 sequence; C: Dual-luciferase reporter gene assay to investigate the interaction between miR-516b mimic and circRAD18; D: MS2-related RIP experiment to validate the binding relationship
    图3 miR-516b与PDK1的关系及circRAD18的调节作用 A:TargetScan数据库预测PDK1与miR-516b相互作用的mRNA 3-UTR序列;B:双荧光素酶报告基因实验验证miR-516b模拟物和PDK1之间的相互作用;C:qRT-PCR分析miR-516b对PDK1的作用;D:circRAD18、PDK1和miR-516b在Ago2上的聚集;E:circRAD18沉默后,circRAD18与Ago2结合的丰度降低,而PDK1增加Fig.3 Relationship between miR-516b and PDK1 and the regulatory role of circRAD18 A: TargetScan database prediction of mRNA 3-UTR sequences for the interaction between PDK1 and miR-516b; B: Dual-luciferase reporter gene assay to validate the interaction between miR-516b mimic and PDK1; C: qRT-PCR analysis of the effect of miR-516b on PDK1; D: Aggregation of circRAD18, PDK1, and miR-516b on Ago2; E: Decreased abundance of circRAD18 binding to Ago2 and increased PDK1 after circRAD18 silencing
    图4 circRAD18-miR-516b-PDK1轴在直肠癌细胞中的作用 A:miR-516b模拟物及si-circRAD18的转染可抑制细胞葡萄糖摄取,PDK1过表达后,葡萄糖摄取水平可恢复;B:miR-516b模拟物及si-circRAD18的转染可抑制细胞乳酸产生,PDK1过表达后,乳酸产生水平可恢复;C:miR-516b模拟物及si-circRAD18的引入可以降低PDK1的蛋白表达,补充PDK1可逆转Fig.4 The role of the circRAD18-miR-516b-PDK1 axis in colorectal cancer cells A: Transfection with miR-516b mimic and si-circRAD18 can inhibit cellular glucose uptake, and the overexpression of PDK1 can restore glucose uptake levels; B: Transfection with miR-516b mimic and si-circRAD18 can inhibit cellular lactate production, and the overexpression of PDK1 can restore lactate production levels; C: Introduction of miR-516b mimic and si-circRAD18 can reduce the protein expression of PDK1, and supplementation with PDK1 can reverse this effect
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李威,唐云云,彭娟,蒋训归. circRAD18/miR-516b/PDK1轴调节葡萄糖代谢重编程与结直肠癌增殖的关系[J].中国普通外科杂志,2023,32(10):1522-1530.
DOI:10.7659/j. issn.1005-6947.2023.10.011

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  • 收稿日期:2021-10-29
  • 最后修改日期:2023-04-22
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  • 在线发布日期: 2023-11-02