基于荧光素酶双报告基因系统体外验证长爪沙鼠 Cip 4 基因受RXR 及T4 调控
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(浙江省医学科学院,杭州 310013)

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R-33


In vitro verification of Cip 4 gene regulation by RXR and T4 in Mongolian gerbils using luciferase double-reporter gene system
Author:
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(Zhejiang Academy of Medical Sciences, Hangzhou 310013, China)

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    摘要:

    目的 探讨核转录因子TRB?RXR 和激动剂T4 对长爪沙鼠 Cip 4 基因表达的调控作用?方法 合成长爪沙鼠 Cip 4 基因启动子区序列,构建报告载体pGL3- Cip 4;将转录因子TRB?RXR 克隆到pcDNA3. 1 表达载体上?将pGL3- Cip 4,pcDNA3. 1-TRB,pcDNA3. 1-RXR 和pRL-TK(参照质粒)载体共转染到HEK-293 细胞,构建 Cip 4基因的荧光素酶双报告系统?观察质粒用量?TRB 的激动剂甲状腺素T4 等处理对转录活性的影响?结果 以长爪沙鼠 Cip 4 启动子区为启动序列的双荧光素酶报告基因系统在(启动子+转录因子):pRL-TK=20∶1?总质粒量为2μg 时转染效率最高,并具有最高的荧光素酶活性?检测结果显示,仅加入TRB 不改变 Cip 4 的转录水平( P >0. 05),仅加入RXR 可以增加 Cip 4 的转录水平( P <0. 05),RXR 与T4 共同作用可上调 Cip 4 的转录水平( P <0. 001)?TRB与T4 共同作用可下调 Cip 4 活性( P <0. 05)?RXR?TRB?T4 共存时, Cip 4 的转录水平显著下调( P <0. 01)?结论 本研究证实了T4?TRB 及RXR 共调控长爪沙鼠 Cip 4 基因的转录,模拟了配体激活型转录因子TRB/ RXR 活化目的基因 Cip 4 的转录,同时证实了 Cip 4 的转录活化与RXR 信号通路密切相关,为揭示甲状腺素在人类NAFLD 中的作用机制奠定了基础?本报告基因系统可用于配体激活型转录因子调控 Cip 4 基因表达的机理分析及相关药物的筛选?

    Abstract:

    Objective To investigate the regulatory effect of nuclear transcription factors thyroxine receptor (TRB) and retinoic acid receptor X (RXR), as well as the agonist T4, on Cdc42-interacting protein 4 ( Cip 4) gene expression. Methods The Cip 4 gene promoter of Mongolian gerbils was cloned into the luciferase-reporter sequence of pGL3 basic to construct a new plasmid pGL3- Cip 4. Coding sequences of transcription factors TRB and RXR were cloned into pcDNA3. 1 eukaryotic expression vectors. pGL3- Cip 4, pcDNA3. 1-TRB, pcDNA3. 1-RXR, and pRL-TK (reference plasmid) vectors were used to transfect HEK-293 cells to form a luciferase double-reporter system for the Cip 4 gene. Transfection efficiency was optimized by adjusting the ratio of these plasmids. The agonist T4 was used to analyze transcriptional activity. Results Transfection efficiency and luciferase activity were the highest when a total amount of 2 μg plasmid and a ratio of 20∶1 between the (promoter + transcription factor) and pRL-TK. RXR could significantly increase Cip 4 gene transcription of ( P < 0. 05), whereas TRB did not alter Cip 4 transcription ( P > 0. 05). Thyroxine T4 could enhance RXR upregulation ( P < 0. 001), while a combination of T4 and TRB downregulated Cip 4 transcription ( P < 0. 05). Levels of Cip 4 transcription were significantly downregulated in the presence of T4, RXR, and TRB ( P < 0. 01). Conclusions T4, TRB, and RXR had coregulatory effects on Cip 4 gene transcription in Mongolian gerbils; moreover, they simulated the process of ligand T4 agonizing TRB/ RXR to activate Cip 4 gene transcription. These result indicating that Cip 4 transcription was significantly affected by the RXR signaling pathway lay the foundation for revealing thyroxine’ s mechanism of action in human nonalcoholic fatty liver disease, as well as the study of ligand-agonizing nuclear transcription factor regulation of Cip 4 gene expression and related drug screening.

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王志远,刘月环.基于荧光素酶双报告基因系统体外验证长爪沙鼠 Cip 4 基因受RXR 及T4 调控[J].中国比较医学杂志,2019,29(11):78~84.

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  • 在线发布日期: 2019-12-10
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