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https://www.readbyqxmd.com/read/28427200/idh1-r132h-mutation-regulates-glioma-chemosensitivity-through-nrf2-pathway
#1
Kaishu Li, Leping Ouyang, Mingliang He, Ming Luo, Wangqing Cai, Yalin Tu, Rongbiao Pi, Anmin Liu
PURPOSE: Numerous studies have reported that glioma patients with isocitrate dehydrogenase 1(IDH1) R132H mutation are sensitive to temozolomide treatment. However, the mechanism of IDH1 mutations on the chemosensitivity of glioma remains unclear. In this study, we investigated the role and the potential mechanism of Nrf2 in IDH1 R132H-mediated drug resistance. METHODS: Wild type IDH1 (R132H-WT) and mutant IDH1 (R132H) plasmids were constructed. Stable U87 cells and U251 cells overexpressing IDH1 were generated...
March 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423580/procollagen-lysine-2-oxoglutarate-5-dioxygenase-2-promotes-hypoxia-induced-glioma-migration-and-invasion
#2
Yangyang Xu, Lin Zhang, Yuzhen Wei, Xin Zhang, Ran Xu, Mingzhi Han, Bing Huang, Anjing Chen, Wenjie Li, Qing Zhang, Gang Li, Jian Wang, Peng Zhao, Xingang Li
Poor prognosis of glioblastoma multiforme is strongly associated with the ability of tumor cells to invade the brain parenchyma, which is believed to be the major factor responsible for glioblastoma recurrence. Therefore, identifying the molecular mechanisms driving invasion may lead to the development of improved therapies for glioblastoma patients. Here, we investigated the role of procollagen-lysine 2-oxoglutarate 5-dioxygenase 2 (PLOD2), an enzyme catalyzing collagen cross-linking, in the biology of glioblastoma invasion...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28420995/quantum-dots-sirna-nanoplexes-for-gene-silencing-in-central-nervous-system-tumor-cells
#3
Guimiao Lin, Ting Chen, Jinyun Zou, Yucheng Wang, Xiaomei Wang, Jiefeng Li, Qijun Huang, Zicai Fu, Yingying Zhao, Marie Chia-Mi Lin, Gaixia Xu, Ken-Tye Yong
RNA interfering (RNAi) using short interfering RNA (siRNA) is becoming a promising approach for cancer gene therapy. However, owing to the lack of safe and efficient carriers, the application of RNAi for clinical use is still very limited. In this study, we have developed cadmium sulphoselenide/Zinc sulfide quantum dots (CdSSe/ZnS QDs)-based nanocarriers for in vitro gene delivery. These CdSSe/ZnS QDs are functionalized with polyethyleneimine (PEI) to form stable nanoplex (QD-PEI) and subsequently they are used for siRNA loading which specially targets human telomerase reverse transcriptase (TERT)...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28415741/enhancement-of-radiosensitivity-by-the-novel-anticancer-quinolone-derivative-vosaroxin-in-preclinical-glioblastoma-models
#4
Giovanni Luca Gravina, Andrea Mancini, Claudia Mattei, Flora Vitale, Francesco Marampon, Alessandro Colapietro, Giulia Rossi, Luca Ventura, Antonella Vetuschi, Ernesto Di Cesare, Judith A Fox, Claudio Festuccia
PURPOSE: Glioblastoma multiforme (GBM) is the most aggressive brain tumor. The activity of vosaroxin, a first-in-class anticancer quinolone derivative that intercalates DNA and inhibits topoisomerase II, was investigated in GBM preclinical models as a single agent and combined with radiotherapy (RT). RESULTS: Vosaroxin showed antitumor activity in clonogenic survival assays, with IC50 of 10-100 nM, and demonstrated radiosensitization. Combined treatments exhibited significantly higher γH2Ax levels compared with controls...
March 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415577/high-expression-of-b7-h6-in-human-glioma-tissues-promotes-tumor-progression
#5
Tianwei Jiang, Wei Wu, Huasheng Zhang, Xiangsheng Zhang, Dingding Zhang, Qiang Wang, Lei Huang, Ye Wang, Chunhua Hang
B7-H6, a new member of B7-family ligand, also known as NCR3LG1, plays an important role in NK cells mediated immune responses. Many studies have shown that it is highly expressed in various human cancers, and its expression levels are significantly associated with cancer patients' clinicopathological parameters and postoperative prognoses. But, still the exact role of B7-H6 expression in human glioma remains elusive. In the present study, we have characterized the B7-H6 expression in the human glioma tissues as well as glioma cell lines, U87 and U251...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28409734/intratumoral-delivery-of-bortezomib-impact-on-survival-in-an-intracranial-glioma-tumor-model
#6
Weijun Wang, Hee-Yeon Cho, Rachel Rosenstein-Sisson, Nagore I Marín Ramos, Ryan Price, Kyle Hurth, Axel H Schönthal, Florence M Hofman, Thomas C Chen
OBJECTIVE Glioblastoma (GBM) is the most prevalent and the most aggressive of primary brain tumors. There is currently no effective treatment for this tumor. The proteasome inhibitor bortezomib is effective for a variety of tumors, but not for GBM. The authors' goal was to demonstrate that bortezomib can be effective in the orthotopic GBM murine model if the appropriate method of drug delivery is used. In this study the Alzet mini-osmotic pump was used to bring the drug directly to the tumor in the brain, circumventing the blood-brain barrier; thus making bortezomib an effective treatment for GBM...
April 14, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28409498/differential-pro-apoptotic-effects-of-synthetic-4-thiazolidinone-derivative-les-3288-doxorubicin-and-temozolomide-in-human-glioma-u251-cells
#7
Lesya I Коbylinska, Olga Yu Klyuchivska, Iryna I Grytsyna, Natalia Finiuk, Rostyslav R Panchuk, Marina O Starykovych, Lilya Lehka, Roman B Lesyk, Borys S Zіmenkovsky, Rostyslav S Stoika
AIM: To compare various pro-apoptotic effects of synthetic 4-thiazolidinone derivative (Les-3288), doxorubicin (Dox) and temozolomide (TMZ) in the treatment of human glioma U251 cells to improve treatment outcomes of glioblastoma and avoid anticancer drug resistance. METHODS: The cytotoxic effects of drugs used in human glioma U251 cells were measured by cell viability and proliferation assay (MTT), Trypan blue exclusion test, and Western-blot analysis of the apoptosis-related proteins...
April 14, 2017: Croatian Medical Journal
https://www.readbyqxmd.com/read/28405688/regulation-of-glioma-migration-and-invasion-via-modification-of-rap2a-activity-by-the-ubiquitin-ligase-nedd4-1
#8
Lei Wang, Bingxin Zhu, Shiquan Wang, Yuxuan Wu, Wenjian Zhan, Shao Xie, Hengliang Shi, Rutong Yu
Νeuronal precursor cell expressed and developmentally downregulated protein (Nedd4-1) is an E3 ubiquitin ligase with critical roles in the pathogenesis of cancer. Herein, we demonstrated that Nedd4-1 protein was upregulated in glioma tissues vs. that in non-cancerous tissues by western blotting and immunohistochemistry. Scratch migration and Transwell chamber assays indicated that downregulation of Nedd4-1 significantly reduced the migration and invasion of the glioma cell lines U251 and U87. Conversely, overexpression of Nedd4-1 obviously enhanced the migratory and invasive capacities in both cell lines...
May 2017: Oncology Reports
https://www.readbyqxmd.com/read/28404978/effects-of-aqp5-gene-silencing-on-proliferation-migration-and-apoptosis-of-human-glioma-cells-through-regulating-egfr-erk-p38-mapk-signaling-pathway
#9
Jian Yang, Jian-Nan Zhang, Wei-Lin Chen, Gui-Song Wang, Qing Mao, Shan-Quan Li, Wen-Hao Xiong, Ying-Ying Lin, Jian-Wei Ge, Xiao-Xiong Li, Zhao Gu, Chun-Run Zhao
We investigated the effects of aquaporin 5 (AQP5) gene silencing on the proliferation, migration and apoptosis of human glioma cells through regulating the EGFR/ERK/p38MAPK signaling pathway. qRT-PCR was applied to examine the mRNA expressions of AQP5 in five human glioma cell lines. U87-MG, U251 and LN229 cells were selected and assigned into blank, vector, AQP5 siRNA and FlagAQP5 groups. MTT assay was used to measure cell proliferation. Flow cytometry (FCM) with AnnexinV-FITC/PI double staining and PI staining were employed to analyze cell apoptosis and cell cycle respectively...
March 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28401302/combinatorial-therapy-with-adenoviral-mediated-pten-and-a-pi3k-inhibitor-suppresses-malignant-glioma-cell-growth-in-vitro-and-in-vivo-by-regulating-the-pi3k-akt-signaling-pathway
#10
Yang Nan, Liyun Guo, Yunpeng Song, Le Wang, Kai Yu, Qiang Huang, Yue Zhong
PURPOSE: Glioblastoma is a highly invasive and challenging tumor of the central nervous system. The mutation/deletion of the tumor suppressor phosphatase and tensin homolog (PTEN) gene is the main genetic change identified in glioblastomas. PTEN plays a critical role in tumorigenesis and has been shown to be an important therapeutic target. The phosphatidylinositol 3-kinase (PI3K) inhibitor LY294002 is commonly used to inhibit glioma cell growth via regulation of the PI3K/AKT signaling pathway...
April 11, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28398872/hydrogen-peroxide-induced-secreted-frizzled-related-protein-1-gene-demethylation-contributes-to-hydrogen-peroxide-induced-apoptosis-in-human-u251-glioma-cells
#11
Zhiguo Xing, Yaping Ni, Junjie Zhao, Xudong Ma
Glioblastoma multiforme is a type of central nervous system tumor with extremely poor prognosis. Previously, hydrogen peroxide (H2O2), which promotes the oxidative stress response, has been reported to induce the apoptosis of glioma cells. Recently, secreted frizzled-related protein 1 (SFRP1) has been shown to be associated with various types of malignant tumors and with H2O2-induced oxidative stress in cardiomyocytes by negatively regulating the Wnt signaling pathway. This study aimed to explore SFRP1 expression and its roles in H2O2-induced apoptosis in human glioma cells...
February 28, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28381990/knockdown-of-long-non-coding-rna-kcnq1ot1-restrained-glioma-cells-malignancy-by-activating-mir-370-ccne2-axis
#12
Wei Gong, Jian Zheng, Xiaobai Liu, Yunhui Liu, Junqing Guo, Yana Gao, Wei Tao, Jiajia Chen, Zhiqing Li, Jun Ma, Yixue Xue
Accumulating evidence has highlighted the potential role of long non-coding RNAs (lncRNAs) as biomarkers and therapeutic targets in solid tumors. Here, we elucidated the function and possible molecular mechanisms of lncRNA KCNQ1OT1 in human glioma U87 and U251 cells. Quantitative Real-Time polymerase chain reaction (qRT-PCR) demonstrated that KCNQ1OT1 expression was up-regulated in glioma tissues and cells. Knockdown of KCNQ1OT1 exerted tumor-suppressive function in glioma cells. Moreover, a binding region was confirmed between KCNQ1OT1 and miR-370 by dual-luciferase assays...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28380416/actin-cytoskeleton-regulator-arp2-3-complex-is-required-for-dll1-activating-notch1-signaling-to-maintain-the-stem-cell-phenotype-of-glioma-initiating-cells
#13
Chen Zhang, Long Hai, Meng Zhu, Shengping Yu, Tao Li, Yu Lin, Bo Liu, Xingchen Zhou, Lei Chen, Pengfei Zhao, Hua Zhou, Yubao Huang, Kai Zhang, Bingcheng Ren, Xuejun Yang
Glioblastoma (GBM) is the most common and lethal primary intracranial tumor. Actin cytoskeleton regulator Arp2/3 complex stimulates glioma cell motility and migration, and thus triggers tumor invasion. However, little is known regarding the role of actin cytoskeleton in maintaining the stem cell phenotype. Here, we showed that Arp2/3 complex improved stem cell phenotype maintenance through sustaining the activated Notch signaling. ShRNA targeting Notch ligand Delta-like 1 (DLL1) decreased CD133 and Nestin expression, and impaired the self-renewal ability of CD133+ U87-MG and U251-MG glioma cells, indicating DLL1/Notch1 signaling promoted stem cell phenotype maintenance...
March 23, 2017: Oncotarget
https://www.readbyqxmd.com/read/28380412/%C3%AE-asarone-promotes-temozolomide-s-entry-into-glioma-cells-and-decreases-the-expression-of-p-glycoprotein-and-mdr1
#14
Nanbu Wang, Qinxin Zhang, Baile Ning, Laiyu Luo, Yongqi Fang
Glioma is the most common primary brain tumor and has an undesirable prognosis due to the blood-brain barrier (BBB) and drug resistance. A thorough investigation of the changes in intracellular drug concentrations is important to observe therapeutic effects and cell resistance. P-glycoprotein (P-gp) is an essential protein of Multi-drug resistance 1 (MDR1). The over-expression of P-gp and MDR1 is associated with poor prognosis and drug-resistance in glioma. However, β-asarone can pass through the BBB easily and increase the drug concentration in the rat brain...
April 2, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28379642/the-combined-influence-of-hydrogel-stiffness-and-matrix-bound-hyaluronic-acid-content-on-glioblastoma-invasion
#15
Jee-Wei Emily Chen, Sara Pedron, Brendan A C Harley
Glioblastoma (GBM) is the most common and lethal form of brain cancer. Its high mortality is associated with its aggressive invasion throughout the brain. The heterogeneity of stiffness and hyaluronic acid (HA) content within the brain makes it difficult to study invasion in vivo. A dextran-bead assay is employed to quantify GBM invasion within HA-functionalized gelatin hydrogels. Using a library of stiffness-matched hydrogels with variable levels of matrix-bound HA, it is reported that U251 GBM invasion is enhanced in softer hydrogels but reduced in the presence of matrix-bound HA...
April 5, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28370217/the-sensitivity-of-glioma-cells-to-pyropheophorbide-%C3%AE-methyl-ester-mediated-photodynamic-therapy-is-enhanced-by-inhibiting-abcg2
#16
Li Pan, Haidan Lin, Si Tian, Dingqun Bai, Yuhan Kong, Lehua Yu
BACKGROUND AND OBJECTIVE: To study the mechanisms of human glioblastoma cell resistance to methyl ester pyropheophorbide-a-mediated photodynamic therapy (MPPa-PDT) and the relationship between the cells and adenosine triphosphate-binding cassette superfamily G member 2 (ABCG2). STUDY DESIGN/MATERIALS AND METHODS: The sensitivity of four human glioma cell lines (U87, A172, SHG-44, and U251) to MPPa-PDT was detected with a CCK-8 assay. Cell apoptosis, intracellular MPPa, and singlet oxygen were tested with flow cytometry...
March 29, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28369556/the-effects-of-50-hz-magnetic-field-exposure-on-dna-damage-and-cellular-functions-in-various-neurogenic-cells
#17
Liling Su, Aziguli Yimaer, Xiaoxia Wei, Zhengping Xu, Guangdi Chen
Epidemiological studies have indicated a possible association between extremely low-frequency magnetic field (ELF-MF) exposure and the risk of nervous system diseases. However, laboratory studies have not provided consistent results for clarifying this association, despite many years of studies. In this study, we have systematically investigated the effects of 50 Hz MF exposure on DNA damage and cellular functions in both neurogenic tumor cell lines (U251, A172, SH-SY5Y) and primary cultured neurogenic cells from rats (astrocytes, microglia, cortical neurons)...
March 21, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28368417/oncogenic-effects-of-evolutionarily-conserved-noncoding-rna-econexin-on-gliomagenesis
#18
S Deguchi, K Katsushima, A Hatanaka, K Shinjo, F Ohka, T Wakabayashi, H Zong, A Natsume, Y Kondo
Accumulating studies have demonstrated the importance of long noncoding RNAs (lncRNAs) during oncogenic transformation. However, because most lncRNAs are currently uncharacterized, the identification of novel oncogenic lncRNAs is difficult. Given that intergenic lncRNA have substantially less sequence conservation patterns than protein-coding genes across species, evolutionary conserved intergenic lncRNAs are likely to be functional. The current study identified a novel intergenic lncRNA, LINC00461 (ECONEXIN) using a combined approach consisting of searching lncRNAs by evolutionary conservation and validating their expression in a glioma mouse model...
April 3, 2017: Oncogene
https://www.readbyqxmd.com/read/28362995/targeting-effect-of-microrna-on-cd133-and-its-impact-analysis-on-proliferation-and-invasion-of-glioma-cells
#19
C Zhao, Z G Ma, S L Mou, Y X Yang, Y H Zhang, W C Yao
MiR-200b, a member of the microRNA-200 family, has been identified to be capable of suppressing glioma cell growth through targeting CREB1 or CD133. However, whether miR-200b affects the biological behavior (proliferation, invasion, and migration) of glioma cells is poorly understood. The aim of this study was to evaluate the effect of miR-200b on the biological behavior of glioma cells in vitro. MiRNA-200b mimics, miRNA-200b inhibitor, and mimic control were transfected into conventionally cultured glioma U251 cells, followed by measuring the expression of miR-200b and CD133 in transfected cells by RT-PCR; effect of miR-200b on CD133 mRNA 3'-UTR luciferase activity by luciferase reporter assay; proliferation activity of transfected U251 cells by MTT method; and changes in U251 cell invasion and migration by Transwell method after transfection...
March 30, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28358414/salinomycin-exhibits-anti-angiogenic-activity-against-human-glioma-in-vitro-and-in-vivo-by-suppressing-the-vegf-vegfr2-akt-fak-signaling-axis
#20
Yan-Ling Bi, Pei-Yan Mi, Shi-Jun Zhao, Heng-Ming Pan, Hui-Juan Li, Fei Liu, Lu-Rong Shao, Hui-Fang Zhang, Pu Zhang, Shi-Liang Jiang
Tumor angiogenesis plays a crucial role in tumor growth, progression and metastasis, and suppression of tumor angiogenesis has been considered as a promising anticancer strategy. Salinomycin (SAL), an antibiotic, displays novel anticancer potential against several human cancer cells in vitro and in vivo. However, little information concerning its anti-angiogenic properties is available. Therefore, the anti‑angiogenic effect of SAL and the underlying mechanism in human glioma were evaluated in the present study...
March 29, 2017: International Journal of Molecular Medicine
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