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https://www.readbyqxmd.com/read/29164620/repair-gene-mgmt-is-controlled-by-sp1-and-upregulated-by-glucocorticoids-but-not-by-temozolomide-and-radiation
#1
Dorthe Aasland, Thomas R Reich, Maja T Tomicic, Olivier J Switzeny, Bernd Kaina, Markus Christmann
Therapy of malignant glioma relies on treatment with the O(6) -methylating agent temozolomide (TMZ) concomitant with ionizing radiation followed by adjuvant TMZ. For the treatment of recurrences DNA chloroethylating drugs are also used. The main killing lesion induced by these drugs is O(6) -alkylguanine. Since this damage is repaired by O(6) -methylguanine-DNA methyltransferase (MGMT), the repair enzyme represents the most important factor of drug resistance, limiting the therapy of malignant high-grade gliomas...
November 22, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/29164578/mir-590-3p-promotes-colon-cancer-cell-proliferation-via-wnt-%C3%AE-catenin-signaling-pathway-by-inhibiting-wif1-and-dkk1
#2
Z-Y Feng, X-H Xu, D-Z Cen, C-Y Luo, S-B Wu
OBJECTIVE: Colon cancer is one of the most common and deadly types of gastrointestinal tumor. Despite progressive treatments, the patient prognosis has not been improved effectively. MATERIALS AND METHODS: Expression of miRNA and mRNA were tested by Realtime PCR. Cell cycle was detected by flow cytometry. Cell viability was evaluated by MTT assay. Cell spheroid formation was determined by colony assay. Wnt signaling pathway activity was evaluated by TOP/FOP ratio...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29163818/pediatric-brain-tumor-cells-release-exosomes-with-a-mirna-repertoire-that-differs-from-exosomes-secreted-by-normal-cells
#3
Ágota Tűzesi, Teresia Kling, Anna Wenger, Taral R Lunavat, Su Chul Jang, Bertil Rydenhag, Jan Lötvall, Steven M Pollard, Anna Danielsson, Helena Carén
High-grade gliomas (HGGs) are very aggressive brain tumors with a cancer stem cell component. Cells, including cancer stem cells, release vesicles called exosomes which contain small non-coding RNAs such as microRNAs (miRNAs). These are thought to play an important role in cell-cell communication. However, we have limited knowledge of the types of exosomal miRNAs released by pediatric HGG stem cells; a prerequisite for exploring their potential roles in HGG biology. Here we isolated exosomes released by pediatric glioma stem cells (GSCs) and compared their repertoire of miRNAs to genetically normal neural stem cells (NSCs) exosomes, as well as their respective cellular miRNA content...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29152649/identification-of-key-genes-in-glioma-cpg-island-methylator-phenotype-via-network-analysis-of-gene-expression-data
#4
Lijuan Bo, Bo Wei, Zhanfeng Wang, Daliang Kong, Zheng Gao, Zhuang Miao
Gene expression data were analysed using bioinformatic tools to demonstrate molecular mechanisms underlying the glioma CpG island methylator phenotype (CIMP). A gene expression data set (accession no. GSE30336) was downloaded from Gene Expression Omnibus, including 36 CIMP+ and 16 CIMP- glioma samples. Differential analysis was performed for CIMP+ vs. CIMP‑ samples using the limma package in R. Functional enrichment analysis was subsequently conducted for differentially expressed genes (DEGs) using Database for Annotation, Visualization and Integration Discovery...
October 19, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29138857/mir%C3%A2-218-inhibits-the-proliferation-of-human-glioma-cells-through-downregulation-of-yin-yang-1
#5
Yong Gao, Laisheng Sun, Zicheng Wu, Chengmin Xuan, Junxia Zhang, Yongping You, Xincheng Chen
Malignant glioma is the most common cancer type of the nervous system and the mechanisms driving the occurrence and development remain unclear, preventing effective treatment of this disease. Therefore, novel and efficient therapies for glioma are required. MicroRNAs (miRNAs) are small non‑coding RNAs that act as oncogenes or tumor suppressors in human cancer. In the present study, it was confirmed that Yin Yang‑1 (YY1), a transcription factor that is part of the polycomb group protein (PcG) family, is a direct target of miR‑218 in human glioma cells...
November 15, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29138748/identifying-novel-glioma-associated-noncoding-rnas-by-their-expression-profiles
#6
Alenka Matjašič, Mojca Tajnik, Emanuela Boštjančič, Mara Popović, Boštjan Matos, Damjan Glavač
Long noncoding RNAs (lncRNAs) and microRNAs (miRNAs) play a significant role in cancer development as regulators of protein-coding genes. Their dysregulation was in some extent already associated with glioma, the most aggressive primary brain tumours in adults. The correct diagnosis and treatment selection due to high tumour heterogeneity might be difficult and inadequate, resulting in poor prognosis. Studies of expression patterns of noncoding RNAs (ncRNAs) could provide useful insight in glioma molecular development...
2017: International Journal of Genomics
https://www.readbyqxmd.com/read/29115595/role-of-the-microrna-181-family-in-glioma-development
#7
Liu Yang, Yueyun Ma, Yijuan Xin, Ruobin Han, Rui Li, Xiaoke Hao
MicroRNAs (miRNAs) are small, noncoding regulatory RNAs that regulate protein expression by reducing mRNA stability and/or translation, via base pairing with full or partial sequence‑complementary target mRNAs. Recent evidence indicates that miRNAs have roles as tumor suppressors and oncogenes. The members of the miRNA181 (miR181) family have been reported to be downregulated in early stage human glioma, and to be involved in glioma development. The current study demonstrated that all subtypes of the miRNA 181 family were downregulated at stages of human glioma, including miR181a1, a2, b1, b2, c and d...
October 26, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29115476/prognostic-micrornas-and-their-potential-molecular-mechanism-in-pancreatic-cancer-a-study-based-on-the-cancer-genome-atlas-and-bioinformatics-investigation
#8
Liang Liang, Dan-Ming Wei, Jian-Jun Li, Dian-Zhong Luo, Gang Chen, Yi-Wu Dang, Xiao-Yong Cai
Although certain biomarkers that are directly associated with the overall survival (OS) of patients with pancreatic adenocarcinoma (PAAD) have been identified, the efficacy of a single factor is limited to predicting the prognosis. The aim of the present study was to identify a combination micro (mi)RNA signature that enhanced the prognostic prediction for PAAD. Following analysis of the data available from The Cancer Genome Atlas (TCGA), 175 PAAD samples were selected for the present study, and the associations between 494 miRNAs and OS were investigated...
November 3, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29115407/suppression-of-microrna-130b-inhibits-glioma-cell-proliferation-and-invasion-and-induces-apoptosis-by-pten-akt-signaling
#9
Jian-Jun Gu, Kai-Chun Fan, Jian-He Zhang, Hong-Jie Chen, Shou-Sen Wang
Glioblastoma is the most common malignant brain tumor in adults and is characterized by extensive proliferation and the diffused invasion of tumor cells. Due to the intricate signaling pathways involved in glioma progression, more effective targeted therapies and prognostic biomarkers in clinical practice are required. The suppression of proto-oncogene function or recovery of tumor suppressor gene function remains one of the primary approaches in gene therapy. The close association between the abnormal expression or mutation of microRNA (miRNA) and the tumorigenesis, progression and staging in glioma have been demonstrated previously...
November 2, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29076027/serum-exosomal-mir-301a-as-a-potential-diagnostic-and-prognostic-biomarker-for-human-glioma
#10
Fengming Lan, Qin Qing, Qiang Pan, Man Hu, Huiming Yu, Xiao Yue
PURPOSE: Exosomal miRNAs that play an important role in cell-cell communication have attracted major attention as potential diagnostic and prognostic biomarkers for various cancers. The aim of this study was to determine the diagnostic/prognostic significance of serum exosomal miR-301a in glioma patients. METHODS: Quantitative real-time PCR was used to determine the serum exosomal expression levels of miR-301a. Kaplan-Meier survival analyses, Cox regression analyses and ROC working curve analyses were applied to assess the diagnostic and prognostic values of miR-301a in glioma patients...
October 26, 2017: Cellular Oncology (Dordrecht)
https://www.readbyqxmd.com/read/29074968/coding-and-noncoding-landscape-of-extracellular-rna-released-by-human-glioma-stem-cells
#11
Zhiyun Wei, Arsen O Batagov, Sergio Schinelli, Jintu Wang, Yang Wang, Rachid El Fatimy, Rosalia Rabinovsky, Leonora Balaj, Clark C Chen, Fred Hochberg, Bob Carter, Xandra O Breakefield, Anna M Krichevsky
Tumor-released RNA may mediate intercellular communication and serve as biomarkers. Here we develop a protocol enabling quantitative, minimally biased analysis of extracellular RNAs (exRNAs) associated with microvesicles, exosomes (collectively called EVs), and ribonucleoproteins (RNPs). The exRNA complexes isolated from patient-derived glioma stem-like cultures exhibit distinct compositions, with microvesicles most closely reflecting cellular transcriptome. exRNA is enriched in small ncRNAs, such as miRNAs in exosomes, and precisely processed tRNA and Y RNA fragments in EVs and exRNPs...
October 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/29074558/mir-6743-5p-as-a-direct-upstream-regulator-of-grim-19-enhances-proliferation-and-suppresses-apoptosis-in-glioma-cells
#12
Fang Cao, Qiang Zhang, Wei Chen, Feng Zheng, Qishan Ran, Yang He, Yang Gao, Shengtao Yao
Gene associated with retinoid-interferon-induced mortality-19 (GRIM-19) has been recognized as a tumor suppressor protein, which regulates cell growth, apoptosis and migration by signal transducer and activator of transcription 3 (STAT3) signaling pathway and non-STAT3 pathway in glioma cells. Here, we investigated the molecular mechanisms that regulated GRIM-19 expression in glioma cells. By the TargetScan algorithm, four microRNAs (miRNAs), hsa-miR-17-3p, hsa-miR-423-5p, hsa-miR-3184-5p and hsa-miR-6743-5p, were identified with the potential to bind with 3'-untranslated regions (UTR) of GRIM-19...
October 26, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/29067452/synergistic-regulatory-effects-of-micrornas-on-brain-glioma-cells
#13
Yilei Zhao, Xiaomeng Cui, Wenliang Zhu, Xin Chen, Chen Shen, Zhendong Liu, Guang Yang, Yaohua Liu, Shiguang Zhao
Glioma is among the most common types of cancer of the central nervous system and is difficult to cure. Due to the lack of glioma-specific treatments, patients with glioma exhibit high mortality rates. MicroRNAs (miRNAs) participate in the pathogenesis of glioma, and upregulation of specific miRNAs promotes cell proliferation, whereas apoptosis‑inducing miRNAs are markedly downregulated in the context of glioma. Therefore, miRNAs may be important contributors to the pathogenesis of glioma. In the present study, nine miRNAs were investigated as miRNA‑miRNA pairs, and the measured cell viabilities were consistent with the results of synergy predictions...
August 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29050344/microrna-141-3p-promotes-glioma-cell-growth-and-temozolomide-resistance-by-directly-targeting-p53
#14
Xu Zhou, Weining Wu, Ailiang Zeng, Er Nie, Xin Jin, Tianfu Yu, Tongle Zhi, Kuan Jiang, Yingyi Wang, Junxia Zhang, Yongping You
Glioblastoma multiforme is the most common primary malignancy in the brain and confers a uniformly poor prognosis. MicroRNAs have been shown to activate or inhibit tumorigenesis. Abnormalities in the p53 signaling pathway are found in various cancers and correlate with tumor formation. We examined the expression of microRNA-141-3p (miR-141-3p) in glioma of different grades by analysis of expression profiling databases and clinical specimens. Cell proliferation and flow cytometry assays were performed to evaluate the promotion of miR-141-3p in proliferation, cell cycle, apoptosis, and temozolomide resistance of glioblastoma cells in vitro...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29048686/mir-1908-as-a-novel-prognosis-marker-of-glioma-via-promoting-malignant-phenotype-and-modulating-spry4-raf1-axis
#15
Zhi Chai, Huijie Fan, Yanyan Li, Lijuan Song, Xiaoming Jin, Jiezhong Yu, Yanhua Li, Cungen Ma, Ran Zhou
MicroRNAs (miRNAs) are reported to be involved in the development of glioma. However, study on miRNAs in glioma is limited. The present study aimed to identify miRNAs which can act as potential novel prognostic markers for glioma and analyze its possible mechanism. We show that miR-1908 correlates with shorter survival time of glioma patients via promoting cell proliferation, invasion, anti-apoptosis and regulating SPRY4/RAF1 axis. Analysis of GEO and TCGA database found that miR-1908 was significantly upregulated in glioma tissues, and strongly associated with shorter survival time of glioma patients...
September 26, 2017: Oncology Reports
https://www.readbyqxmd.com/read/29048680/mir%C3%A2-146b%C3%A2-5p-suppresses-glioblastoma-cell-resistance-to-temozolomide-through-targeting-traf6
#16
Zhongrun Qian, Sunhai Zhou, Zhiyi Zhou, Xi Yang, Shuanlin Que, Jin Lan, Yongming Qiu, Yingying Lin
Temozolomide (TMZ), as a kind of alkylating agent, is widely utilized for the treatment of glioblastoma (GBM). However, temozolomide resistance (TR) often develops quickly and results in tumor recurrence and poor outcome. Recent advances have demonstrated that miRNAs exert critical roles in chemoresistance. Downregulation of miR‑146b‑5p promotes glioma cell proliferation, reduces apoptosis, and correlates with poor survival of patients. Nonetheless, the function of miR‑146b‑5p in temozolomide resistance remains unclear...
September 19, 2017: Oncology Reports
https://www.readbyqxmd.com/read/29048626/microrna-485-inhibits-malignant-biological-behaviour-of-glioblastoma-cells-by-directly-targeting-pak4
#17
Ke Mao, Ding Lei, Heng Zhang, Chao You
Glioblastoma (GBM), which is characterised by rapid growth, cellular heterogeneity, angiogenesis, extensive invasion, hypoxia and necrosis, is the most common histological subtype of glioma in adults. MicroRNA (miRNA) dysregulation is a common feature of human cancers, including GBM. Previous studies have suggested that miRNAs are a novel class of regulatory molecules in various human cancers. Therefore, miRNAs may be investigated as a novel candidate and screening tool in the clinical diagnosis, therapy and prognosis of GBM...
September 14, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28979807/microrna-625-inhibits-the-proliferation-and-increases-the-chemosensitivity-of-glioma-by-directly-targeting-akt2
#18
Jiale Zhang, Jian Zhang, Jie Zhang, Wenjin Qiu, Shuo Xu, Qun Yu, Chengke Liu, Yingyi Wang, Ailin Lu, Junxia Zhang, Xiaoming Lu
Glioma is a malignant tumor for which new therapies are needed. Growing evidence has demonstrated that microRNAs (miRNAs) have a major effect on glioma development. Here, we aimed to characterize a novel anti-cancer miRNA, miR-625, by investigating its expression, function, and mechanism of action in glioma progression. The expression of miR-625 and its target mRNA in human glioma tissues and cell lines was assessed by real-time PCR, western blotting, and immunohistochemistry. Functional significance was assessed by examining cell cycle progression, proliferation, apoptosis, and chemosensitivity to temozolomide in vitro, and by examining growth of subcutaneous glioblastoma in a mouse model in vivo...
2017: American Journal of Cancer Research
https://www.readbyqxmd.com/read/28977881/microrna-145-induces-apoptosis-of-glioma-cells-by-targeting-bnip3-and-notch-signaling
#19
Yan Du, Juan Li, Tao Xu, Dan-Dan Zhou, Lei Zhang, Xiao Wang
MicroRNAs (miRNAs) are involved in the pathogenesis of various human cancers. Here we show that miR-145 expression is decreased in human glioma samples, rat glioma tissues, and glioma cell lines, while expression of BNIP3 is increased. Over-expression of miR-145 or suppression of BNIP3 induced glioma cell apoptosis. BNIP3 is localized in the nucleus in glioma cells, and miR-145 inhibits BNIP3 expression by binding to the 3' untranslated region of its mRNA. Interestingly, miR-145 and BNIP3 regulate glioma cell apoptosis by modulating Notch signaling...
September 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28970140/microrna-675-promotes-glioma-cell-proliferation-and-motility-by-negatively-regulating-retinoblastoma-1
#20
Yungui Zheng, Xiaowen Lu, Liepeng Xu, Zhe Chen, Qinxi Li, Jun Yuan
Previous studies indicated that microRNA(miR)-675 and its precursor lncRNA H19 were both overexpressed in glioma tissues, and H19 might play an oncogenic role. To investigate the involvement of miR-675 in gliomas and its underlying mechanisms, we here collected candidate target genes of miR-675-5p from miRTarBase (http://mirtarbase.mbc.nctu.edu.tw/, Release 6.0), which contains the experimentally validated microRNA-target interactions. Then, regulatory effects of miR-675 on its target genes were validated using clinical samples and glioma cell lines...
September 29, 2017: Human Pathology
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