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[1]阚荣林,赵丽.TBX3介导BRAFV600E诱导的甲状腺癌失分化的功能研究[J].天津医科大学学报,2026,32(01):14-22.[doi:10.20135/j.issn.1006-8147.2026.01.0014]
 KAN Ronglin,ZHAO Li.The functional study of TBX3 in mediating BRAFV600E-induced dedifferentiation of thyroid cancer[J].Journal of Tianjin Medical University,2026,32(01):14-22.[doi:10.20135/j.issn.1006-8147.2026.01.0014]
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TBX3介导BRAFV600E诱导的甲状腺癌失分化的功能研究(PDF)

《天津医科大学学报》[ISSN:1006-8147/CN:12-1259/R]

卷:
32卷
期数:
2026年01期
页码:
14-22
栏目:
肿瘤疾病专题
出版日期:
2026-01-20

文章信息/Info

Title:
The functional study of TBX3 in mediating BRAFV600E-induced dedifferentiation of thyroid cancer
文章编号:
1006-8147(2026)01-0014-09
作者:
阚荣林赵丽
(天津医科大学基础医学院生物化学与分子生物学系,天津300070)
Author(s):
KAN RonglinZHAO Li
(Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China)
关键词:
甲状腺癌BRAFV600ETBX3失分化
Keywords:
thyroid cancer BRAFV600E TBX3 dedifferentiation
分类号:
R34
DOI:
10.20135/j.issn.1006-8147.2026.01.0014
文献标志码:
A
摘要:
目的:探究TBX3在BRAFV600E诱导的甲状腺癌细胞失分化中的作用。方法:利用原位自发甲状腺乳头状癌小鼠模型(mPTC)以及诱导型过表达BRAFV600E的体外甲状腺失分化癌模型(Nthy-BRAFV600E Teton),分析TBX3表达水平与甲状腺癌分化基因表达变化的相关性;在体外甲状腺未分化癌(ATC)细胞系KHM-5M以及8505C中敲低TBX3,通过Western印迹、RT-qPCR、Transwell及细胞成球实验,评估其对细胞分化、迁移和干性的影响。结果:免疫组化/免疫荧光实验结果显示,在甲状腺癌进展过程中,Tbx3与分化标志物(Pax8、Tg、Nis)的表达水平呈负相关。在Nthy-BRAFV600E Teton细胞系中加入强力霉素,Western印迹结果显示随着磷酸化细胞外信号调节激酶1/2的持续性激活,BRAF以及TBX3的表达水平逐渐升高。CCK-8实验结果显示,过表达BRAFV600E后细胞增殖能力明显提升(t=9.076,P<0.000 1)。选取诱导 48 h为最佳诱导时间点,此时TBX3表达水平显著升高(t=6.180,P<0.01),分化基因TG、PAX8以及FOXE1的mRNA水平明显降低(t=4.101、2.994、4.392,均P<0.05)。RT-qPCR结果显示,ATC细胞系KHM-5M以及8505C中TBX3的mRNA水平明显高于人正常甲状腺上皮细胞Nthy(q=18.82、6.562,均P<0.01)。当KHM-5M以及8505C中,TBX3的表达量明显降低(敲低组 vs. 对照组,KHM-5M中q=82.29、61.22,均P<0.000 1;8505C中q=25.89、26.71,均P<0.001)时,Western印迹结果显示NIS(q=35.50、9.343,均P<0.01;q=19.02、20.55,均P<0.001)、PAX8(q=27.72、17.16,均P<0.001;q=6.831、7.015,均P<0.05)、TPO(q=27.14、6.113,均P<0.05;q=56.34、10.81,均P<0.01)、TTF-1(q=16.69、4.576,均P<0.05;q=25.69、22.70,均P<0.001)的表达水平显著上调。Transwell迁移实验表明,敲低TBX3显著抑制了KHM-5M以及8505C的迁移能力(敲低组 vs. 对照组,KHM-5M中q=10.90、11.67,均P<0.000 1;8505C中q=14.49、35.19,均P<0.000 1)。此外,细胞成球实验结果显示,敲低TBX3后,KHM-5M以及8505C的成球能力明显降低(敲低组vs.对照组,KHM-5M中q=8.660、12.56,均P<0.001;8505C中q=10.41、14.79,均P<0.000 1)。结论:TBX3通过抑制甲状腺癌细胞分化、增强迁移能力以及维持干细胞特性,介导了BRAFV600E诱导的甲状腺癌失分化,从而促进肿瘤的恶性进展。
Abstract:
Objective: To investigate the role of T-box transcription factor 3 (TBX3) in BRAFV600E-induced dedifferentiation of thyroid carcinoma cells. Methods: The correlation between TBX3 expression and alterations in thyroid cancer differentiation gene expression was analyzed using a mouse model of in situ spontaneous papillary thyroid carcinoma (mPTC) and an inducible BRAFV600E-overexpressing in vitro dedifferentiated thyroid carcinoma cell model (Nthy-BRAFV600E Teton). TBX3 was knocked down in vitro in human anaplastic thyroid carcinoma (ATC) cell lines (KHM-5M, 8505C). The effects on cell differentiation, migration, and stemness were assessed via Western blotting, reverse transcription quantitative polymerase chain reaction (RT-qPCR), Transwell, and tumorsphere formation assays. Results: Immunohistochemical and immunofluorescence analyses revealed an inverse correlation between the expression levels of Tbx3 and differentiation markers(Pax8, thyroglobulin, sodium-iodide symporter) during thyroid cancer progression. Doxycycline induction in Nthy-BRAFV600E Teton cells resulted in sustained p-extracellular regulated protein kinase 1/2 activation, accompanied by progressively increased BRAF and TBX3 protein levels. CCK-8 assays demonstrated significantly enhanced cellular proliferation upon BRAFV600E overexpression (t=9.076, P<0.000 1). The 48-hour induction point was selected for subsequent experiments, characterized by significantly elevated TBX3 expression (t=6.180, P<0.01) and markedly reduced mRNA levels of differentiation genes TG, PAX8, and FOXE1 (t=4.101, 2.994, 4.392; all P<0.05). RT-qPCR confirmed significantly higher TBX3 mRNA levels in ATC cell lines KHM-5M and 8505C compared to immortalized normal human thyroid epithelial cells (Nthy) (q=18.82, 6.562, both P<0.01). In KHM-5M and 8505C, efficient TBX3 knockdown (knockdown group vs. control group: KHM-5M, q=82.29, 61.22; 8505C, q=25.89, 26.71; all P<0.001) led to significant upregulation of key differentiation proteins, as shown by Western blotting: NIS (KHM-5M: q=35.50, 9.343; 8505C: q=19.02, 20.55), PAX8 (KHM-5M: q=27.72, 17.16; 8505C: q=6.831, 7.015), thyroid peroxidase (KHM-5M: q=27.14, 6.113; 8505C: q=56.34, 10.81), and thyroid transcription factor-1 (KHM-5M: q=16.69, 4.576; 8505C: q=25.69, 22.70) (all P<0.05 unless otherwise specified; specific P-values for all protein comparisons were P<0.01 or P<0.001). TBX3 knockdown significantly attenuated the migratory capacity of both ATC cell lines KHM-5M and 8505C in Transwell assays (knockdown vs. control: KHM-5M, q=10.90, 11.67; 8505C, q=14.49, 35.19; all P<0.000 1). Furthermore, tumorsphere formation assays revealed a significant impairment in stem cell-like properties of KHM-5M and 8505C upon TBX3 depletion (knockdown vs. control: KHM-5M, q=8.660, 12.56; 8505C, q=10.41, 14.79; all P<0.001). Conclusion: TBX3 mediates BRAFV600E-induced dedifferentiation in thyroid cancer by repressing cellular differentiation, enhancing migratory potential, and maintaining stemness, thereby collectively promoting malignant progression.

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备注/Memo

备注/Memo:
基金项目:国家自然科学基金 (82073052)
作者简介:阚荣林(2000-),女,硕士在读, 研究方向:医学生物化学与分子生物学;
通信作者:赵丽, E-mail: shzhaoli@tmu.edu.cn。
更新日期/Last Update: 2026-01-15