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TRIP6 enhances stemness property of breast cancer cells through activation of Wnt/β-catenin.

TRIP6 通过激活 Wnt/β-catenin 增强乳腺癌细胞的干性。

  • 影响因子:3.81
  • DOI:10.1186/s12935-020-1136-z
  • 作者列表:"Zhao X","Jiang C","Xu R","Liu Q","Liu G","Zhang Y
  • 发表时间:2020-02-14
Abstract

Background:The urgent problem in the treatment of breast cancer is the recurrence induced by breast cancer stem cells (CSCs). Understanding the role and molecular mechanism of specific molecules in breast cancer stem cells can provide a theoretical basis for better treatment. TRIP6 is an adapter protein which belongs to the zyxin family of LIM proteins and is important in regulating the functions of CSCs. The present study aims to investigate the effects and mechanism of TRIP6 in breast cancer. Methods:TRIP6 expression in breast cancer cells and tissues were detected by Real-Time PCR, western blot and immunohistochemistry (IHC). MTT assays, colony formation assays, Xenografted tumor model and mammosphere formation assays were performed to investigate the oncogenic functions of TRIP6 in the tumorigenic capability and the tumor-initiating cell-like phenotype of breast cancer cells in vitro and in vivo. Luciferase reporter, subcellular fractionation and immunofluorescence staining assays were performed to determine the underlying mechanism of TRIP6-mediated stemness of breast cancer cells. Results:TRIP6 expression was significantly upregulated in breast cancer, and was closely related to the clinicopathologic characteristics, poor overall survival (OS), relapse-free survival (RFS) and poor prognosis of breast cancer patients. Functional studies revealed that overexpression of TRIP6 significantly enhanced proliferative, tumorigenicity capability and the cancer stem cell-like properties of breast cancer in vitro and in vivo. On the contrary, silencing TRIP6 achieved the opposite results. Notably, we found that TRIP6 promoted Wnt/β-catenin signaling pathway in breast cancer to strengthen the tumor-initiating cell-like phenotype of breast cancer cells. Conclusions:This study indicates that TRIP6 plays an important role in maintaining the stem cell-like characteristics of breast cancer cells, supporting the significance of TRIP6 as a novel potential prognostic biomarker and therapeutic target for diagnosis and treatment of breast cancer.

摘要

背景: 乳腺癌干细胞 (CSCs) 诱导的复发是乳腺癌治疗中亟待解决的问题。了解特定分子在乳腺癌干细胞中的作用及分子机制,可为更好的治疗提供理论依据。TRIP6 是一种适配器蛋白,属于 LIM 蛋白的 zyxin 家族,在调节 CSCs 的功能中起重要作用。本研究旨在探讨 TRIP6 在乳腺癌中的作用及机制。 方法: 采用 Real-Time PCR 、 western blot 和免疫组织化学 (IHC) 检测 TRIP6 在乳腺癌细胞和组织中的表达。MTT 分析,集落形成分析, 进行异种移植肿瘤模型和 mamosphere 形成试验,研究 TRIP6 在体外和体内乳腺癌细胞的致瘤能力和肿瘤起始细胞样表型中的致癌功能。通过荧光素酶报告基因、亚细胞分离和免疫荧光染色等方法研究乳腺癌细胞 TRIP6-mediated 干性的机制。 结果: TRIP6 在乳腺癌中表达明显上调,且与乳腺癌的临床病理特征、总生存期 (OS) 、无复发生存期 (RFS) 密切相关。和预后不良的乳腺癌患者。功能研究发现,TRIP6 的过表达在体内外显著增强了乳腺癌的增殖、致瘤能力和肿瘤干细胞样特性。相反,沉默 TRIP6 取得了相反的结果。值得注意的是,我们发现 TRIP6 在乳腺癌中促进 Wnt/β-catenin 信号通路,以加强乳腺癌细胞的肿瘤起始细胞样表型。 结论: 本研究表明 TRIP6 在维持乳腺癌细胞干细胞样特性中发挥重要作用, 支持 TRIP6 作为乳腺癌诊断和治疗的新型潜在预后生物标志物和治疗靶点的意义。

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翻译标题与摘要 下载文献
影响因子:2.87
发表时间:2020-01-31
来源期刊:Bioscience reports
DOI:10.1042/BSR20192546
作者列表:["Chen X","Theobard R","Zhang J","Dai X"]

METHODS::RAD50 is commonly depleted in basal-like breast cancer with concomitant absence of INPP4B and several tumor suppressors such as BRCA1 and TP53. Our previous study revealed that INPP4B and RAD50 interact and such an interaction is associated with breast cancer survival at the transcriptional, translational and genomic levels. In the present study, we explored single nucleotide polymorphisms (SNPs) of these two genes that have synergistic effects on breast cancer survival to decipher mechanisms driving their interactions at the genetic level. The Cox's proportional hazards model was used to test whether SNPs of these two genes are interactively associated with breast cancer survival, following expression quantitative trait loci (eQTL) analysis and functional investigations. Our study revealed two disease-associating blocks, each encompassing five and two non-linkage disequilibrium linked SNPs of INPP4B and RAD50, respectively. Concomitant presence of any rare homozygote from each disease-associating block is synergistically prognostic of poor breast cancer survival. Such synergy is mediated via bypassing pathways controlling cell proliferation and DNA damage repair, which are represented by INPP4B and RAD50. Our study provided genetic evidence of interactions between INPP4B and RAD50, and deepened our understandings on the orchestrated genetic machinery governing tumor progression.

翻译标题与摘要 下载文献
影响因子:3.29
发表时间:2020-01-31
来源期刊:BMC cancer
DOI:10.1186/s12885-020-6534-z
作者列表:["Soliman H","Shah V","Srkalovic G","Mahtani R","Levine E","Mavromatis B","Srinivasiah J","Kassar M","Gabordi R","Qamar R","Untch S","Kling HM","Treece T","Audeh W"]

METHODS:BACKGROUND:Increased usage of genomic risk assessment assays suggests increased reliance on data provided by these assays to guide therapy decisions. The current study aimed to assess the change in treatment decision and physician confidence based on the 70-gene risk of recurrence signature (70-GS, MammaPrint) and the 80-gene molecular subtype signature (80-GS, BluePrint) in early stage breast cancer patients. METHODS:IMPACt, a prospective, case-only study, enrolled 452 patients between November 2015 and August 2017. The primary objective population included 358 patients with stage I-II, hormone receptor-positive, HER2-negative breast cancer. The recommended treatment plan and physician confidence were captured before and after receiving results for 70-GS and 80-GS. Treatment was started after obtaining results. The distribution of 70-GS High Risk (HR) and Low Risk (LR) patients was evaluated, in addition to the distribution of 80-GS compared to IHC status. RESULTS:The 70-GS classified 62.5% (n = 224/358) of patients as LR and 37.5% (n = 134/358) as HR. Treatment decisions were changed for 24.0% (n = 86/358) of patients after receiving 70-GS and 80-GS results. Of the LR patients initially prescribed CT, 71.0% (44/62) had CT removed from their treatment recommendation. Of the HR patients not initially prescribed CT, 65.1% (41/63) had CT added. After receiving 70-GS results, CT was included in 83.6% (n = 112/134) of 70-GS HR patient treatment plans, and 91.5% (n = 205/224) of 70-GS LR patient treatment plans did not include CT. For patients who disagreed with the treatment recommended by their physicians, most (94.1%, n = 16/17) elected not to receive CT when it was recommended. For patients whose physician-recommended treatment plan was discordant with 70-GS results, discordance was significantly associated with age and lymph node status. CONCLUSIONS:The IMPACt trial showed that treatment plans were 88.5% (n = 317/358) in agreement with 70-GS results, indicating that physicians make treatment decisions in clinical practice based on the 70-GS result. In clinically high risk, 70-GS Low Risk patients, there was a 60.0% reduction in treatment recommendations that include CT. Additionally, physicians reported having greater confidence in treatment decisions for their patients in 72% (n = 258/358) of cases after receiving 70-GS results. TRIAL REGISTRATION:"Measuring the Impact of MammaPrint on Adjuvant and Neoadjuvant Treatment in Breast Cancer Patients: A Prospective Registry" (NCT02670577) retrospectively registered on Jan 27, 2016.

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