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https://www.readbyqxmd.com/read/29350596/enhancement-of-antitumor-activity-by-using-5-ala-mediated-sonodynamic-therapy-to-induce-apoptosis-in-malignant-gliomas-significance-of-high-intensity-focused-ultrasound-on-5-ala-sdt-in-a-mouse-glioma-model
#1
Satoshi Suehiro, Takanori Ohnishi, Daisuke Yamashita, Shohei Kohno, Akihiro Inoue, Masahiro Nishikawa, Shiro Ohue, Junya Tanaka, Takeharu Kunieda
OBJECTIVE High invasiveness of malignant gliomas frequently causes early local recurrence of the tumor, resulting in extremely poor outcome. To control such recurrence, novel therapies targeted toward infiltrating glioma cells around the tumor border are required. Here, the authors investigated the antitumor activity of sonodynamic therapy (SDT) combined with a sonosensitizer, 5-aminolevulinic acid (5-ALA), on malignant gliomas to explore the possibility for clinical use of 5-ALA-mediated SDT (5-ALA-SDT). METHODS In vitro cytotoxicity of 5-ALA-SDT was evaluated in U87 and U251 glioma cells and in U251Oct-3/4 glioma stemlike cells...
January 19, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29344634/underlying-mechanism-of-the-photodynamic-activity-of-hematoporphyrin%C3%A2-induced-apoptosis-in-u87-glioma-cells
#2
Shi-Xiang Yuan, Jun-Liang Li, Xin-Ke Xu, Wei Chen, Cheng Chen, Kun-Qi Kuang, Fang-Yu Wang, Kai Wang, Fang-Cheng Li
Photodynamic therapy (PDT) is a relatively novel type of tumor therapy method with low toxicity and limited side‑effects. The aim of the present study was to investigate the underlying mechanism and potential microRNAs (miRNAs) involved in the treatment of glioma by PDT with hematoporphyrin, a clinical photosensitizer. The photodynamic activity of hematoporphyrin on the cell viability and apoptosis of gliomas was investigated by MTT, and flow cytometry and fluorescence microscopy, respectively. Alterations in singlet oxygen and mitochondrial membrane potential were detected...
January 18, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29344278/potent-peptide-conjugated-silicon-phthalocyanines-for-tumor-photodynamic-therapy
#3
Qian Liu, Mingpei Pang, Sihai Tan, Jin Wang, Qingle Chen, Kai Wang, Wenjie Wu, Zhangyong Hong
Phthalocyanines (Pcs) are a group of promising photosensitizers for use in photodynamic therapy (PDT). However, their extremely low solubility and their strong tendency to aggregate in aqueous solution greatly restrict their application. Conjugation of Pc macrocycles with peptide ligands could be a very useful strategy to optimize the physical properties of Pcs not only by increasing their water solubility and reducing their aggregation but also by endowing the conjugates with a tumor-targeting capability. To develop highly potent photosensitizers for tumor PDT, we prepared new peptide-conjugated photosensitizers using silicon Pc (SiPc), which has much higher photodynamic activity than zinc Pcs, as the light activation moiety and the cRGDfK peptide (or simply cRGD) as the peptide moiety...
2018: Journal of Cancer
https://www.readbyqxmd.com/read/29339188/the-enhancement-of-siplk1-penetration-across-bbb-and-its-anti-glioblastoma-activity-in-vivo-by-magnet-and-transferrin-co-modified-nanoparticle
#4
Dao-Zhou Liu, Ying Cheng, Rong-Qiao Cai, Wen-Wen Wang, Han Cui, Miao Liu, Bang-le Zhang, Qi-Bing Mei, Si-Yuan Zhou
In order to enhance the penetration of small interference RNA against the polo-like kinase I (siPLK1) across BBB to treat glioblastoma (GBM), transferrin (Tf) modified magnetic nanoparticle (Tf-PEG-PLL/MNP@siPLK1) was prepared. The in vitro experiments indicated that Tf-PEG-PLL/MNP@siPLK1 enhanced the cellular uptake of siPLK1, which resulted in an increase of gene silencing effect and cytotoxicity of Tf-PEG-PLL/MNP@siPLK1 on U87 cells. Besides, Tf-PEG-PLL/MNP@siPLK1 significantly inhibited the growth of U87 glioblastoma spheroids and markedly increased the BBB penetration efficiency of siPLK1 with the application of external magnetic field in in-vitro BBB model...
January 12, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29334602/high-dose-metformin-plus-temozolomide-shows-increased-anti-tumor-effects-in-glioblastoma-in-vitro-and-in-vivo-compared-with-monotherapy
#5
Jung Eun Lee, Ji Hee Lim, Yong Kil Hong, Seung Ho Yang
Purpose: The purpose of the study is to investigate the efficacy of combined treatment with temozolomide (TMZ) and metformin for glioblastoma (GBM) in vitro and in vivo. Materials and Methods: We investigated the efficacy of combined treatment with TMZ and metformin using cell viability and apoptosis assays. A GBM orthotopic mice model was established by inoculation of 5x105 U87 cells and treated with metformin, TMZ, and the combination for 4 weeks. Western blotting and immunofluorescence of tumor specimens were analyzed to investigate AMP-activated protein kinase (AMPK) and AKT pathway...
January 10, 2018: Cancer Research and Treatment: Official Journal of Korean Cancer Association
https://www.readbyqxmd.com/read/29329651/lignans-and-diterpenes-isolated-from-tirpitzia-ovoidea-and-their-biological-activities
#6
Xue-Yan Yang, Yi-Fan Zhang, Li-Jia Liu, Yi Wang, Ming-Ying Shang, Feng Xu, Guang-Xue Liu, Shao-Qing Cai
A new lignan, tirpitzin A (17) together with 20 known compounds (1-16, and 18-21) were isolated from the ethyl acetate soluble fraction of ethanol extract of the aerial parts of Tirpitzia ovoidea. The structure of new compound was elucidated by means of spectroscopic analysis. Of the known compounds, 7-21 were isolated from Linaceae family for the first time. The pharmacological activity of the crude extracts was tested using a mouse inflammation model induced by dimethyl benzene. The results demonstrated that the ethyl acetate soluble fraction had anti-inflammatory activity...
December 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/29329030/pdok2-caspase-3-dependent-glioma-cell-growth-arrest-by-nitidine-chloride
#7
Ravindra Pramod Deshpande, Phanithi Prakash Babu
BACKGROUND: Nitidine chloride (NC) is known to exert anticancer and anti-metastatic effects on a variety of tumors. Recently, NC has also been shown to inhibit PIK3/AKT/mTOR axis in U87 human glioma cells. METHODS: The study shows NC employing pDok2, caspase 3 dependent cell death in C6 rat glioma and U87 human malignant glioblastoma cells. The effect of NC on glioblastoma cell lines was accessed by MTT, clonogenic and wound healing assays. Cell cycle analysis was performed by FACS...
July 29, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/29328618/highly-crystalline-multicolor-carbon-nanodots-for-dual-modal-imaging-guided-photothermal-therapy-of-glioma
#8
Min Qian, Yilin Du, Shanshan Wang, Chengyi Li, Huiling Jiang, Wei Shi, Jian Chen, Yi Wang, Ernst Wagner, Rongqin Huang
Imaging-guided site-specific photothermal therapy (PTT) of glioma and other tumors in central nervous system (CNS) presents a great challenge for the current nanomaterial design. Herein, an in-situ solid-state transformation method was developed for the preparation of multicolor highly crystalline carbon nanodots (HCCDs). The synthesis yields 6-8 nm sized HCCDs containing a highly crystalline carbon nanocore and a hydrophilic surface, which therefore simultaneously provide strong photoacoustic and photothermal performance as well as tunable fluorescence emission...
January 12, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29328446/clinical-significance-of-iroquois-homeobox-gene-irx1-in-human-glioma
#9
Pengxing Zhang, Nan Liu, Xiaoshan Xu, Zhen Wang, Yingduan Cheng, Weilin Jin, Xin Wang, Hongwei Yang, Hui Liu, Yongsheng Zhang, Yanyang Tu
The present study aimed to investigate the location, expression and clinical significance of Iroquois homeobox gene (IRX1) in human glioma. The expression of IRX1 gene in glioma cell lines (U87, U373, LN229 and T98G) and normal brain tissue was detected via reverse transcription-polymerase chain reaction. The IRX1 protein in fresh glioma specimens, with the adjacent normal brain tissue, was quantified through western blotting. The archived glioma only specimens from the present hospital and glioma specimens with adjacent normal brain tissue, from Alenabio biotechnology, were subjected to immunohistochemistry and tissue microarray analysis, respectively...
January 9, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29319175/bk-channels-blockage-inhibits-hypoxia-induced-migration-and-chemoresistance-to-cisplatin-in-human-glioblastoma-cells
#10
Paolo Rosa, Luigi Catacuzzeno, Luigi Sforna, Giorgio Mangino, Silvia Carlomagno, Gabriella Mincione, Vincenzo Petrozza, Giuseppe Ragona, Fabio Franciolini, Antonella Calogero
Glioblastoma (GBM) cells express large-conductance, calcium-activated potassium (BK) channels, whose activity is important for several critical aspects of the tumor, such as migration/invasion and cell death. GBMs are also characterized by a heavy hypoxic microenvironment that exacerbates tumor aggressiveness. Since hypoxia modulates the activity of BK channels in many tissues, we hypothesized that a hypoxia-induced modulation of these channels may contribute to the hypoxia-induced GBM aggressiveness. In U87-MG cells, hypoxia induced a functional upregulation of BK channel activity, without interfering with their plasma membrane expression...
January 10, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29316313/microrna-21-promotes-glioma-cell-proliferation-and-inhibits-senescence-and-apoptosis-by-targeting-spry1-via-the-pten-pi3k-akt-signaling-pathway
#11
Chang Chai, Lai-Jun Song, Shuang-Yin Han, Xi-Qing Li, Ming Li
AIMS: Our study aims to investigate the effect of microRNA-21 (miR-21) on the proliferation, senescence, and apoptosis of glioma cells by targeting SPRY1 via the PTEN/PI3K/AKT signaling pathway. METHODS: Glioma tissues and brain tissues were collected for this study after surgical decompression for traumatic brain injury. RT-qPCR was employed to measure mRNA levels of miR-21, SPRY1, PTEN, PI3K, and AKT, and Western blotting was conducted to determine protein levels of SPRY1, PTEN, PI3K, AKT, p-AKT, Caspase-3, Caspase-9, P53, GSK3, and p-GSK3...
January 5, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29316206/inhibition-of-vegf-dependent-angiogenesis-and-tumor-angiogenesis-by-an-optimized-antibody-targeting-clec14a
#12
Taek-Keun Kim, Chang Sik Park, Jihye Jang, Mi Ra Kim, Hee-Jun Na, Kangseung Lee, Hyun Jung Kim, Kyun Heo, Byong Chul Yoo, Young-Myeong Kim, Je-Wook Lee, Su Jin Kim, Eun Sung Kim, Dae Young Kim, Kiweon Cha, Tae Gyu Lee, Sukmook Lee
The C-type lectin-like domain of CLEC14a (CLEC14a-CTLD) is a key domain that mediates endothelial cell-cell contacts in angiogenesis. However, the role of CLEC14a-CTLD in pathological angiogenesis has not yet been clearly elucidated. In this study, through complementarity-determining region (CDR) grafting, consecutive deglycosylation, and functional isolation, we generated a novel anti-angiogenic human monoclonal antibody that specifically targets CLEC14a-CTLD and that shows improved stability and homogeneity relative to the parental antibody...
January 9, 2018: Molecular Oncology
https://www.readbyqxmd.com/read/29313975/near-infrared-photoimmunotherapy-targeting-egfr-shedding-new-light-on-glioblastoma-treatment
#13
Thomas A Burley, Justyna Mączyńska, Anant Shah, Wojciech Szopa, Kevin J Harrington, Jessica K R Boult, Anna Mrozek-Wilczkiewicz, Maria Vinci, Jeffrey C Bamber, Wojciech Kaspera, Gabriela Kramer-Marek
Glioblastomas (GBM) are high-grade brain tumours, differentially driven by alterations (amplification, deletion, or missense mutations) in the epidermal growth factor receptor (EGFR), that carry a poor prognosis of just 12-15 months following standard therapy. A combination of interventions targeting tumor-specific cell surface regulators along with convergent downstream signalling pathways may enhance treatment efficacy. Against this background, we investigated a novel photoimmunotherapy approach combining the cytotoxicity of photodynamic therapy with the specificity of immunotherapy...
January 5, 2018: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29296201/autophagy-flux-inhibition-g2-m-cell-cycle-arrest-and-apoptosis-induction-by-ubenimex-in-glioma-cell-lines
#14
Liping Han, Yongfei Zhang, Shuai Liu, Qingwei Zhao, Xianhong Liang, Zhiguo Ma, Prakash K Gupta, Miaoqing Zhao, Aihua Wang
This study aimed to investigate whether ubenimex could work as an anti-tumor drug alone in glioma cells and figure out the underlying potential mechanisms. Ubenimex is widely used as an adjunct therapy in multiple solid cancers. However, it is rarely used to treat glioblastoma. The function of ubenimex in enhancing JQ1 treatment sensitivity of glioma cells by blocking autophagic degradation of HEXIM1 was previously studied. However, the detailed mechanism of autophagy regulation by ubenimex remains unclear...
December 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/29290776/antitumor-activity-and-mechanism-of-a-reverse-transcriptase-inhibitor-dapivirine-in-glioblastoma
#15
Weiwen Liu, Xian-Lu Song, Shan-Chao Zhao, Minyi He, Hai Wang, Ziyang Chen, Wei Xiang, Guozhong Yi, Songtao Qi, Yawei Liu
ETHNOPHARMACOLOGICAL RELEVANCE: Dapivirine is one of reverse transcriptase inhibitors (RTIs). It is the prototype of diarylpyrimidines (DAPY), formerly known as TMC120 or DAPY R147681 (IUPAC name: 4- [[4-(2, 4, 6-trimethylphenyl) amino]-2-pyrimidinyl] amino]-benzonitrile; CAS no.244767-67-7). AIM: The purpose of this study is to investigate the antitumor activity of dapivirine, one of the RTIs, on U87 glioblastoma (GBM) cells in vitro and in vivo. MATERIALS AND METHODS: U87 GBM cells were cultured and treated with or without dapivirine...
2018: Journal of Cancer
https://www.readbyqxmd.com/read/29286139/paeoniflorin-exerts-antitumor-effects-by-inactivating-s-phase-kinase-associated-protein-2-in-glioma-cells
#16
Jia Ouyang, Hui Xu, Ming Li, Xingliang Dai, Fengqing Fu, Xueguang Zhang, Qing Lan
Paeoniflorin (PF), a natural compound isolated from Paeoniae radix, has been shown to exert antitumor effects in various types of human cancers including glioma. However, the mechanism of action is not well understood. S-phase kinase-associated protein (Skp)2 functions as an oncogene in many cancers. In the present study, we investigated whether Skp2 mediates the anti-glioma activity of PF. We found that PF inhibited glioma cell proliferation, migration and invasion, and induced G2/M arrest and apoptosis. Skp2 expression was downregulated in glioma cells treated with PF...
December 28, 2017: Oncology Reports
https://www.readbyqxmd.com/read/29285548/preclinical-evaluation-of-an-18f-trifluoroborate-methionine-derivative-for-glioma-imaging
#17
Xiangyu Yang, Zhibo Liu, Huimin Zhang, Zhu Li, Jeeva P Munasinghe, Gang Niu, Gaojun Teng, Xiaoyuan Chen
PURPOSE: 11C-methionine (MET) is one of the most commonly used amino acid tracers for PET imaging of brain tumors. In this study, we report an 18F-labeled boron-derived methionine analogue, denoted as 18F-B-MET, as a potential substitute of 11C-MET for glioma PET imaging. METHODS: 19F-B-MET was synthesized from readily available chemicals according to our previous publication. For kit development, 19F-B-MET was aliquoted in quantities of 10 nmol for on-demand one-step labeling...
December 29, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29285179/microrna-219-exerts-a-tumor-suppressive-role-in-glioma-via-targeting-sal-like-protein-4
#18
Botao Jiang, Min Li, Fang Ji, Yaxiong Nie
MicroRNAs (miRs) serve important roles in the development and progression of various human cancer types, including glioma. Recently, miR-219 has been suggested to function as a tumor suppressor in glioma; however, the underlying mechanism remains largely unknown. The aim of this study was to investigate the regulatory mechanism of miR-219 in the malignant phenotypes of glioma cells. Quantitative polymerase chain reaction (qPCR) and western blotting were conducted to examine the mRNA and protein expression. An MTT assay, wound healing assay and Transwell assay were used to study cell proliferation, migration and invasion...
December 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29284440/synergistic-inhibition-of-tumor-growth-by-combination-treatment-with-drugs-against-different-subpopulations-of-glioblastoma-cells
#19
Chia-Hsin Chang, Wei-Ting Liu, Hui-Chi Hung, Chia-Yu Gean, Hong-Ming Tsai, Chun-Lin Su, Po-Wu Gean
BACKGROUND: Glioma stem cells (GSCs) contribute to tumor recurrence and drug resistance. This study characterizes the tumorigenesis of CD133+ cells and their sensitivity to pharmacological inhibition. METHODS: GSCs from human U87 and rat C6 glioblastoma cell lines were isolated via magnetic cell sorting using CD133 as a cancer stem cell marker. Cell proliferation was determined using the WST-1 assay. An intracranial mouse model and bioluminescence imaging were used to assess the effects of drugs on tumor growth in vivo...
December 29, 2017: BMC Cancer
https://www.readbyqxmd.com/read/29282022/chromosomal-instability-induced-by-increased-birc5-survivin-levels-affects-tumorigenicity-of-glioma-cells
#20
Marina Conde, Susanne Michen, Ralf Wiedemuth, Barbara Klink, Evelin Schröck, Gabriele Schackert, Achim Temme
BACKGROUND: Survivin, belonging to the inhibitor of apoptosis (IAP) gene family, is abundantly expressed in tumors. It has been hypothesized that Survivin facilitates carcinogenesis by inhibition of apoptosis resulting in improved survival of tumorigenic progeny. Additionally, Survivin plays an essential role during mitosis. Together with its molecular partners Aurora B, Borealin and inner centromere protein it secures bipolar chromosome segregation. However, whether increased Survivin levels contribute to progression of tumors by inducing chromosomal instability remains unclear...
December 28, 2017: BMC Cancer
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