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Breast cancer cell, microRNA

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https://www.readbyqxmd.com/read/29435931/in-vitro-methods-for-analyzing-mirna-roles-in-cancer-cell-proliferation-invasion-and-metastasis
#1
Jian Xu, Xuelian Xiao, Daheng Yang
MicroRNAs (miRNAs) are small noncoding, single-stranded RNAs consisting of 20-24 nucleotides (Bartel, Cell 116:281-297, 2004), which regulate target genes expression by interacting with 3'-untranslated regions (3'-UTRs) of target mRNAs, leading to translation repression or mRNA degradation (Filipowicz et al., Nat Rev Genet 9:102-114, 2008; Nilsen, Trends Genet 23:243-249, 2007). Accumulating evidence has elucidated them as oncogenes or tumor suppressors in cancers such as hepatocellular carcinoma, breast cancer, and lung cancer (Liu et al...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29435304/knockdown-of-microrna-29a-regulates-the-expression-of-apoptosis-related-genes-in-mcf-7-breast-carcinoma-cells
#2
Gholamreza Khamisipour, Elham Mansourabadi, Behrouz Naeimi, Ali Moazzeni, Rahim Tahmasebi, Mojtaba Hasanpour, Majid Mosahebi Mohammadi, Zahra Mansourabadi, Shakib Shamsian
MicroRNA (miR), as non-coding small RNA, are key regulators of cancer-related biological cell processes and contribute to tumor growth through regulation of groups of pro- and anti-apoptotic genes. The present study aimed to investigate the effects of miR-29a on the expression of genes involved in apoptosis, including p21, B-cell lymphoma 2 (BCL-2), p53 and survivin. The MCF-7 breast cancer cell line was transfected with anti-miR-29a and treated with Taxol in subdivided treatment groups including: Scramble; anti-miR-29a; anti-miR-29a + Taxol; Taxol; and control...
February 2018: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/29435032/bioinformatics-identification-of-dysregulated-micrornas-in-triple-negative-breast-cancer-based-on-microrna-expression-profiling
#3
Junqing Chen, Zhanhong Chen, Jian Huang, Feng Chen, Weiwu Ye, Guojun Ding, Xiaojia Wang
Triple negative breast cancer (TNBC) accounts for approximately 15-20% of all breast cancer cases and is usually more aggressive with a poorer clinical outcome compared with other breast cancer subtypes. Evidence of the involvement of microRNAs (miRNAs) in cancer has provided an opportunity for the development of novel effective therapeutic targets in TNBC. In the present study, the miRNA expression profiles of the human breast cancer cell line, MDA-MB-231, and MCF-7 cells, was evaluated by using miRNA microarray analysis...
March 2018: Oncology Letters
https://www.readbyqxmd.com/read/29435003/opposite-response-to-hypoxia-by-breast-cancer-cells-between-cell-proliferation-and-cell-migration-a-clue-from-microrna-expression-profile
#4
Ming Zhang, Chang-E Gao, Wen-Lin Chen, Yi-Yin Tang, Jian-Yun Nie, Li-Da Shen, Xiang Ma, De-Dian Chen
The majority of tumors possess the features of hypoxia. It is generally accepted that hypoxia is a negative prognostic factor for cancer. Low levels of oxygen are able to modify basic cell metabolism status. Elucidating the basic response, including cell proliferation and migration, to hypoxia by cancer cells is important for understanding the role of hypoxia in the development of cancer. In the present study, CoCl2 stimulation was used to simulate hypoxia. A microRNA (miRNA/miR) array was used to systematically detect the changes in miRNA expression profiles...
March 2018: Oncology Letters
https://www.readbyqxmd.com/read/29434704/implications-of-dietary-%C3%AF-3-and-%C3%AF-6-polyunsaturated-fatty-acids-in-breast-cancer
#5
Oana Zanoaga, Ancuta Jurj, Lajos Raduly, Roxana Cojocneanu-Petric, Enrique Fuentes-Mattei, Oscar Wu, Cornelia Braicu, Claudia Diana Gherman, Ioana Berindan-Neagoe
Breast cancer represents one of the most common forms of cancer in women worldwide, with an increase in the number of newly diagnosed patients in the last decade. The role of fatty acids, particularly of a diet rich in ω-3 and ω-6 polyunsaturated fatty acids (PUFAs), in breast cancer development is not fully understood and remains controversial due to their complex mechanism of action. However, a large number of animal models and cell culture studies have demonstrated that high levels of ω-3 PUFAs have an inhibitory role in the development and progression of breast cancer, compared to ω-6 PUFAs...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29431182/comprehensive-circular-rna-profiling-reveals-the-regulatory-role-of-the-circrna-000911-mir-449a-pathway-in-breast-carcinogenesis
#6
Honglei Wang, Yi Xiao, Li Wu, Dachang Ma
Circular RNAs (circRNAs) are key regulators in the development and progression of human cancers; however their roles in breast tumorigenesis are not yet well understood. Thus, the present study aimed to investigate the expression profiles and potential modulatory effects of circRNAs on breast carcinogenesis. A human circRNA microarray analysis was performed to screen for abnormally expressed circRNAs in breast cancer tissue and circRNA-000911 was identified as a circRNA which was significantly downregulated in breast cancer cells...
March 2018: International Journal of Oncology
https://www.readbyqxmd.com/read/29425746/mir-145-overexpression-triggers-alteration-of-the-whole-transcriptome-and-inhibits-breast-cancer-development
#7
Peng Ye, Yu Shi, Nairui An, Qian Zhou, Juan Guo, Xinghua Long
Cumulative evidence has associated microRNA (miRNA) with cancer development, and among those miRNAs, miR-145 has been identified as an anti-oncomiRNA. However, the comprehensive mechanisms of action of miR-145 in breast cancer development have not yet been fully elucidated. Herein, we performed next-generation sequencing to detect the expression profiles of the transcriptome and conducted cellular function experiments after miR-145 overexpression. The results verified the inhibitory effects of miR-145 on breast cancer cell proliferation, colony formation, migration and invasion...
February 6, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29422969/microrna-544-promotes-colorectal-cancer-progression-by-targeting-forkhead-box-o1
#8
Guo-Dong Yao, Ya-Feng Zhang, Peng Chen, Xiu-Bao Ren
Dysregulation of microRNAs has been confirmed to serve an important role in cancer development and progression. However, the role of microRNA (miR)-544 in colorectal cancer progression remains unknown. In the present study, it was observed that the expression level of miR-544 was increased in breast cancer cell lines and tissues using the quantitative polymerase chain reaction. Overexpression of miR-544 promoted cell proliferation and invasion in colorectal cancer, whereas inhibition of miR-544 suppressed colorectal cancer progression as determined using MTT, colony formation and Transwell assays...
January 2018: Oncology Letters
https://www.readbyqxmd.com/read/29416635/otud7b-upregulation-predicts-a-poor-response-to-paclitaxel-in-patients-with-triple-negative-breast-cancer
#9
Hui-Wen Chiu, Hui-Yu Lin, Ing-Jy Tseng, Yuan-Feng Lin
Paclitaxel is a first-line chemotherapeutic for patients with breast cancer, particularly triple-negative breast cancer (TNBC). Molecular markers for predicting pathologic responses to paclitaxel treatment is thus urgently needed since paclitaxel resistance is still a clinical issue in treating TNBCs. We investigated the transcriptional profiling of consensus genes in HCC38 (paclitaxel-sensitive) and MDA-MB436 (paclitaxel-resistant) TNBC cells post-treatment with paclitaxel. We found that OTUD7B was downregulated in HCC38 but upregulated in MDA-MB436 cells after paclitaxel treatment at cytotoxic concentrations...
January 2, 2018: Oncotarget
https://www.readbyqxmd.com/read/29416005/mir-27b-3p-inhibits-proliferation-and-potentially-reverses-multi-chemoresistance-by-targeting-cblb-grb2-in-breast-cancer-cells
#10
Danni Chen, Wengong Si, Jiaying Shen, Chengyong Du, Weiyang Lou, Chang Bao, Huilin Zheng, Jie Pan, Guansheng Zhong, Liang Xu, Peifen Fu, Weimin Fan
Drug resistance remains a major problem in the treatment of conventional chemotherapeutic agents in breast cancers. Owing to heterogeneity and complexity of chemoresistance mechanisms, most efforts that focus on a single pathway were unsuccessful, and exploring novel personalized therapeutics becomes urgent. By a system approach, we identified that microRNA-27b-3p (miR-27b), a miRNA deleted in breast cancer tissues and cell lines, has a master role in sensitizing breast cancer cells to a broad spectrum of anticancer drugs in vitro and in vivo...
February 7, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29414804/microrna-223-targeting-stim1-inhibits-the-biological-behavior-of-breast-cancer
#11
Yanfang Yang, Zhansheng Jiang, Ning Ma, Bin Wang, Jun Liu, Lina Zhang, Lin Gu
BACKGROUND/AIMS: To investigate the cellular effects and clinical significance of microRNA-223 (miR-223) in breast cancer by targeting stromal interaction molecule1 (STIM1). METHODS: Breast cancer cell lines (T47D, MCF-7, SKB-R3, MDA-MB-231 and MDA-MB-435) and a normal breast epithelial cell line (MCF-10A) were prepared for this study. MiR-223 mimics, anti-miR-223 and pcDNA 3.1-STIM1 were transiently transfected into cancer cells independently or together, and then RT-qPCR was performed to detect the expressions of miR-223 and STIM1 mRNA, dual-luciferase reporter assay was conducted to examine the effects of miR-223 on STIM1, Western blotting was used to measure the expressions of the STIM1 proteins, MTT and Trans-well assays were performed to detect cell proliferation and invasion...
January 31, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29409452/whole-blood-micrornas-as-potential-biomarkers-in-post-operative-early-breast-cancer-patients
#12
Marianna Alunni-Fabbroni, Leonie Majunke, Elisabeth K Trapp, Marie Tzschaschel, Sven Mahner, Peter A Fasching, Tanja Fehm, Andreas Schneeweiss, Thomas Beck, Ralf Lorenz, Thomas W P Friedl, Wolfgang Janni, Brigitte Rack
BACKGROUND: microRNAs (miRNAs) are considered promising cancer biomarkers, showing high reliability, sensitivity and stability. Our study aimed to identify associations between whole blood miRNA profiles, presence of circulating tumor cells (CTCs) and clinical outcome in post-operative early breast cancer patients (EBC) to assess the utility of miRNAs as prognostic markers in this setting. METHOD: A total of 48 post-operative patients, recruited in frame of the SUCCESS A trial, were included in this retrospective study and tested with a panel of 8 miRNAs (miR-10b, -19a, - 21, - 22, -20a, - 127, - 155, -200b)...
February 6, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29402894/comprehensive-network-of-mirna-induced-intergenic-interactions-and-a-biological-role-of-its-core-in-cancer
#13
Vladimir V Galatenko, Alexey V Galatenko, Timur R Samatov, Andrey A Turchinovich, Maxim Yu Shkurnikov, Julia A Makarova, Alexander G Tonevitsky
MicroRNAs (miRNAs) are a family of short noncoding RNAs that posttranscriptionally regulate gene expression and play an important role in multiple cellular processes. A significant percentage of miRNAs are intragenic, which is often functionally related to their host genes playing either antagonistic or synergistic roles. In this study, we constructed and analyzed the entire network of intergenic interactions induced by intragenic miRNAs. We further focused on the core of this network, which was defined as a union of nontrivial strongly connected components, i...
February 5, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29399189/microrna-26b-suppresses-autophagy-in-breast-cancer-cells-by-targeting-dram1-mrna-and-is-downregulated-by-irradiation
#14
Cuida Meng, Yang Liu, Yannan Shen, Shuchun Liu, Zhicheng Wang, Qingsheng Ye, Hongyang Liu, Xiaodong Liu, Lili Jia
MicroRNAs (miRs) are small RNAs that do not code for proteins, but instead decrease the stability and suppress the translation of target mRNAs by binding with complementary sequences in their 3'-untranslated regions (3'-UTRs). In the present study, it is reported that breast cancer tumor tissue, as well as irradiated MCF7 breast cancer cells, exhibit decreased levels of miR-26b expression compared with normal breast tissue and MCF7 cells without exposure to radiation. Additionally, a luciferase reporter assay was used to demonstrate that miR-26b directly targetsDNA damage-regulated autophagy modulator 1 (DRAM1)...
February 2018: Oncology Letters
https://www.readbyqxmd.com/read/29396433/let-7-microrna-controls-invasion-promoting-lysosomal-changes-via-the-oncogenic-transcription-factor-myeloid-zinc-finger-1
#15
Siri Amanda Tvingsholm, Malene Bredahl Hansen, Knut Kristoffer Bundgaard Clemmensen, Ditte Marie Brix, Bo Rafn, Lisa B Frankel, Riku Louhimo, José Moreira, Sampsa Hautaniemi, Irina Gromova, Marja Jäättelä, Tuula Kallunki
Cancer cells utilize lysosomes for invasion and metastasis. Myeloid Zinc Finger1 (MZF1) is an ErbB2-responsive transcription factor that promotes invasion of breast cancer cells via upregulation of lysosomal cathepsins B and L. Here we identify let-7 microRNA, a well-known tumor suppressor in breast cancer, as a direct negative regulator of MZF1. Analysis of primary breast cancer tissues reveals a gradual upregulation of MZF1 from normal breast epithelium to invasive ductal carcinoma and a negative correlation between several let-7 family members and MZF1 mRNA, suggesting that the inverse regulatory relationship between let-7 and MZF1 may play a role in the development of invasive breast cancer...
February 3, 2018: Oncogenesis
https://www.readbyqxmd.com/read/29394261/regulating-bmi1-expression-via-mirnas-promote-mesenchymal-to-epithelial-transition-met-and-sensitizes-breast-cancer-cell-to-chemotherapeutic-drug
#16
Nibedita Patel, Koteswara Rao Garikapati, Venkata Krishna Kanth Makani, Ayikkara Drishya Nair, Namratha Vangara, Utpal Bhadra, Manika Pal Bhadra
Polycomb group (PcG) proteinB lymphoma Mo-MLV insertion region 1 homolog (BMI1) is a transcriptional repressor that plays an important role in human carcinogenesis. MicroRNAs (miRNAs) are endogenous small non-coding RNAsthat implicate a negative regulation on gene expression. Deregulation of the expression of miRNAs has been implicated in tumorigenesis. Here, we have shown that knock-down ofBMI1increases theexpression of tumor-suppressivemiRNAs. Elevated levels of expression of miR-200a, miR-200b, miR-15a, miR-429, miR-203were observed upon knock-down of BMI1...
2018: PloS One
https://www.readbyqxmd.com/read/29393459/liraglutide-inhibits-the-proliferation-and-promotes-the-apoptosis-of-mcf-7-human-breast-cancer-cells-through-downregulation-of-microrna-27a-expression
#17
Wei Zhao, Xiaohui Zhang, Zhichao Zhou, Bei Sun, Wenyuan Gu, Jia Liu, Hong Zhang
The use of glucagon-like peptide-1 analogues, such as liraglutide, as hypoglycemic drugs has been widely employed in clinical practice. Liraglutide is reported to exert potential anti‑breast cancer effects, however the specific mechanisms of this action remain unknown. In the present study, MCF‑7 human breast cancer cells were cultured in vitro and treated with various concentrations of liraglutide. Cell Counting Kit‑8, colony formation and flow cytometry assays were performed to determine the proliferation and apoptosis of cells following treatment...
January 24, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29391441/mir-539-acts-as-a-tumor-suppressor-by-targeting-epidermal-growth-factor-receptor-in-breast-cancer
#18
Jilong Guo, Guohua Gong, Bin Zhang
Breast cancer is the most frequently diagnosed malignancy and the leading cause of cancer-associated death in women worldwide. microRNAs (miRNAs) play critical roles in the cellular processes of breast cancer. However, the crucial roles and underlying mechanisms of miR-539 in breast cancer remain unclear. By RT-qPCR, we found that expression of miR-539 was markedly down-regulated in breast cancer tissues and cell lines compared with that in paired adjacent normal tissues and normal cell lines. The low level of miR-539 expression was positively associated with lymph node metastasis...
February 1, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29389061/the-mir-203-snai2-axis-regulates-prostate-tumor-growth-migration-angiogenesis-and-stemness-potentially-by-modulating-gsk-3%C3%AE-%C3%AE-catenin-signal-pathway
#19
Xinxin Tian, Fangfang Tao, Baotong Zhang, Jin-Tang Dong, Zhiqian Zhang
Dysregulation of microRNA expression plays a pivotal role in the initiation and progression of a variety of human carcinomas including prostate cancer. Our previous studies have demonstrated that the silence of miR-203 contributes to the invasiveness of malignant breast cancer cells by targeting SNAI2. However, the effects and underlying mechanisms of miR-203/SNAI2 axis in prostate cancer have not been elucidated. The aim of this study is to explore the effects of miR-203/SNAI2 axis on the biological characteristics of prostate carcinomas both in vitro and in vivo...
February 1, 2018: IUBMB Life
https://www.readbyqxmd.com/read/29387242/microrna-124-3p-directly-targets-pdcd6-to-inhibit-metastasis-in-breast-cancer
#20
Ling Zhang, Xiangming Chen, Baoli Liu, Junqing Han
Breast cancer (BC) is the leading cause of cancer-associated mortality among women worldwide, with a poor 5-year survival rate, particularly among patients with metastatic BC. Previous studies have indicated that the dysregulation of microRNAs (miRNAs/miRs) is associated with carcinogenesis and metastasis. Thus, investigating the underlying molecular mechanisms by which miRNAs mediate their effects may aid in the improvement of BC treatment. In the present study, reverse transcription-quantitative polymerase chain reaction analyses were performed to investigate miR-124-3p expression in BC tissues...
January 2018: Oncology Letters
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