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Yong HAN


Lin XU


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Journal of Zhejiang University SCIENCE B 2022 Vol.23 No.11 P.915-930


Optimized thyroid transcription factor-1 core promoter-driven microRNA-7 expression effectively inhibits the growth of human non-small-cell lung cancer cells

Author(s):  Shipeng CHEN, Lian GUAN, Xu ZHAO, Jing YANG, Longqing CHEN, Mengmeng GUO, Juanjuan ZHAO, Chao CHEN, Ya ZHOU, Yong HAN, Lin XU

Affiliation(s):  Special Key Laboratory of Gene Detection and Therapy & Base for Talents in Biotherapy of Guizhou Province, Zunyi 563000, China; more

Corresponding email(s):   xulinzhouya@163.com, Chinahotfog@126.com, zhouyazmc@163.com

Key Words:  Lung cancer, Thyroid transcription factor-1 (TTF-1), Promoter, MicroRNA-7 (miR-7), Nuclear factor-1 (NF-1)

Shipeng CHEN, Lian GUAN, Xu ZHAO, Jing YANG, Longqing CHEN, Mengmeng GUO, Juanjuan ZHAO, Chao CHEN, Ya ZHOU, Yong HAN, Lin XU. Optimized thyroid transcription factor-1 core promoter-driven microRNA-7 expression effectively inhibits the growth of human non-small-cell lung cancer cells[J]. Journal of Zhejiang University Science B, 2022, 23(11): 915-930.

@article{title="Optimized thyroid transcription factor-1 core promoter-driven microRNA-7 expression effectively inhibits the growth of human non-small-cell lung cancer cells",
author="Shipeng CHEN, Lian GUAN, Xu ZHAO, Jing YANG, Longqing CHEN, Mengmeng GUO, Juanjuan ZHAO, Chao CHEN, Ya ZHOU, Yong HAN, Lin XU",
journal="Journal of Zhejiang University Science B",
publisher="Zhejiang University Press & Springer",

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%T Optimized thyroid transcription factor-1 core promoter-driven microRNA-7 expression effectively inhibits the growth of human non-small-cell lung cancer cells
%A Shipeng CHEN
%A Lian GUAN
%A Jing YANG
%A Longqing CHEN
%A Mengmeng GUO
%A Juanjuan ZHAO
%A Chao CHEN
%A Yong HAN
%A Lin XU
%J Journal of Zhejiang University SCIENCE B
%V 23
%N 11
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.B2200116

T1 - Optimized thyroid transcription factor-1 core promoter-driven microRNA-7 expression effectively inhibits the growth of human non-small-cell lung cancer cells
A1 - Shipeng CHEN
A1 - Lian GUAN
A1 - Xu ZHAO
A1 - Jing YANG
A1 - Longqing CHEN
A1 - Mengmeng GUO
A1 - Juanjuan ZHAO
A1 - Chao CHEN
A1 - Ya ZHOU
A1 - Yong HAN
A1 - Lin XU
J0 - Journal of Zhejiang University Science B
VL - 23
IS - 11
SP - 915
EP - 930
%@ 1673-1581
Y1 - 2022
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.B2200116

Targeted gene therapy has become a promising approach for lung cancer treatment. In our previous work, we reported that the targeted expression of microRNA-7 (miR-7) operated by thyroid transcription factor-1 (TTF-1) promoter inhibited the growth of human lung cancer cells in vitro and in vivo; however, the intervention efficiency needed to be further improved. In this study, we identified the core promoter of TTF-1 (from -1299 bp to -871 bp) by 5' deletion assay and screened out the putative transcription factors nuclear factor-1 (NF-1) and activator protein-1 (AP-1). Further analysis revealed that the expression level of NF-1, but not AP-1, was positively connected with the activation of TTF-1 core promoter in human non-small-cell lung cancer (NSCLC) cells. Moreover, the silencing of NF-1 could reduce the expression level of miR-7 operated by TTF-1 core promoter. Of note, we optimized four distinct sequences to form additional NF-1-binding sites (TGGCA) in the sequence of TTF-1 core promoter (termed as optTTF-1 promoter), and verified the binding efficiency of NF-1 on the optTTF-1 promoter by electrophoretic mobility shift assay (EMSA). As expected, the optTTF-1 promoter could more effectively drive miR-7 expression and inhibit the growth of human NSCLC cells in vitro, accompanied by a reduced transduction of NADH dehydrogenase (ubiquinone) 1α subcomplex 4 (NDUFA4)/protein kinase B (Akt) pathway. Consistently, optTTF-1 promoter-driven miR-7 expression could also effectively abrogate the growth and metastasis of tumor cells in a murine xenograft model of human NSCLC. Finally, no significant changes were detected in the biological indicators or the histology of some important tissues and organs, including heart, liver, and spleen. On the whole, our study revealed that the optimized TTF-1 promoter could more effectively operate miR-7 to influence the growth of human NSCLC cells, providing a new basis for the development of microRNA-based targeting gene therapy against clinical lung cancer.


概要:靶向基因治疗是一种很有前景的肺癌治疗方法。在前期工作中,我们报道了由甲状腺转录因子-1(TTF-1)启动子调控微小RNA-7(miR-7)的靶向表达可在体外和体内抑制人肺癌细胞的生长,但干预效率有待进一步提高。在本研究中,我们通过5’缺失分析鉴定了TTF-1的核心启动子(从−1299 bp到−871 bp),并筛选出潜在的结合转录因子核因子-1(NF-1)和激活蛋白-1(AP-1)。进一步分析的结果表明:NF-1的表达水平,而非AP-1的表达水平,与人非小细胞肺癌NSCLC细胞中TTF-1核心启动子的活性呈正相关。此外,NF-1的沉默可以降低由TTF-1核心启动子调控的miR-7的表达。重要的是,我们在TTF-1核心启动子的序列上优化了四个不同的序列(称为optTTF-1启动子)以形成额外的NF-1结合位点(TGGCA),并通过电泳迁移率实验(EMSA)分析验证了NF-1对optTTF-1启动子的结合效率。通进一步研究,结果显示optTTF-1启动子可更有效地驱动miR-7表达并在体外抑制人NSCLC细胞的生长,同时减少Ⅰ型辅酶脱氢酶1α亚复合物4(NDUFA4)/蛋白激酶B(Akt)通路转导。optTTF-1启动子驱动的miR-7表达同样也可有效地抑制人NSCLC异种移植模型中肿瘤细胞的体内生长和转移。最后,模型动物的心脏、肝脏和脾脏等重要组织和器官的生物学指标和组织学未见明显变化。总之,本研究揭示了优化的TTF-1启动子可更有效地调控miR-7表达来抑制人NSCLC细胞的生长,为开发基于miRNA的靶向基因治疗临床肺癌提供了新的实验基础。


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