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https://www.readbyqxmd.com/read/28822889/metformin-targets-gastric-cancer-stem-cells
#1
Sarah Courtois, Raúl V Durán, Julie Giraud, Elodie Sifré, Julien Izotte, Francis Mégraud, Philippe Lehours, Christine Varon, Emilie Bessède
Gastric cancer is the third leading cause of cancer-related deaths worldwide and has still a poor prognosis. Therefore, new therapeutic strategies are needed: among them, targeting cancer stem cells (CSCs) could offer new opportunities. The aim of our study was to evaluate the anti-tumoural effect of metformin on gastric cancer in vitro and in vivo and especially, to determine whether this molecule could target the gastric CSCs. Metformin effects were evaluated on the proliferation and tumourigenic properties of the gastric CSCs from patient-derived primary tumour xenografts (PDXs) and cancer cell lines (MKN45, AGS and MKN74) in vitro in conventional 2 dimensional (2D) and in 3 dimensional (3D) culture systems, in which only CSCs are able to form tumourspheres and in mouse xenograft models in vivo...
August 17, 2017: European Journal of Cancer
https://www.readbyqxmd.com/read/28819779/curcuma-wenyujin-y-h-chen-et-c-ling-n-butyl-alcohol-extract-inhibits-ags-cell-helicobacter-pylori-caga-vaca-promoted-invasiveness-by-down-regulating-caudal-type-homeobox-transcription-factor-and-claudin-2-expression
#2
Hai-Feng Jin, Jin-Feng Dai, Li-Na Meng, Bin Lu
OBJECTIVE: To investigate the effects and possible mechanisms of action of Curcuma wenyujin Y. H. Chen et C. Ling n-Butyl alcohol extract (CWNAE) on repression of human gastric cancer (GC) AGS cell invasion induced by co-culturing with Helicobacter pylori (HP). METHODS: AGS cells were cultured with HP of positive or negative cytotoxin-associated gene A (CagA) and vacuolating cytotoxin gene A (VacA) expression (CagA+/- or VacA+/-) and divided into 5 group. Group A was cultured without HP as a control, Group B with HPCagA+VacA+, Group C with HPCagA-VacA-, Group D with HPCagA+VacA+ and CWNAE, and Group E with HPCagA-VacA- and CWNAE...
August 17, 2017: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28819095/non-coding-rnas-participate-in-the-regulatory-network-of-cldn4-via-cerna-mediated-mirna-evasion
#3
Yong-Xi Song, Jing-Xu Sun, Jun-Hua Zhao, Yu-Chong Yang, Jin-Xin Shi, Zhong-Hua Wu, Xiao-Wan Chen, Peng Gao, Zhi-Feng Miao, Zhen-Ning Wang
Thousands of genes have been well demonstrated to play important roles in cancer progression. As genes do not function in isolation, they can be grouped into "networks" based on their interactions. In this study, we discover a network regulating Claudin-4 in gastric cancer. We observe that Claudin-4 is up-regulated in gastric cancer and is associated with poor prognosis. Claudin-4 reinforce proliferation, invasion, and EMT in AGS, HGC-27, and SGC-7901 cells, which could be reversed by miR-596 and miR-3620-3p...
August 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28810604/hard-clam-extracts-induce-atypical-apoptosis-in-human-gastric-cancer-cells
#4
Eing-Ju Song, Michael W Y Chan, Jyh-Wei Shin, Che-Chun Chen
Hard clams (HCs) are a nutritionally high-quality and popular seafood, and are established to be a potent antitumor food. The aim of the present study was to determine whether HC extracts induce apoptosis in the human gastric cancer cell line, AGS. In contrast with previously reported methods of extraction, crude extracts of HC were obtained by freezing and thawing and by a method free of hot water or organic solvents. The composition, quality and properties of the HC extracts were demonstrated to be stable since the extracts that were evaluated by capillary electrophoresis and HPLC analysis at different timepoints were similar...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28803918/modeling-of-trex1-dependent-autoimmune-disease-using-human-stem-cells-highlights-l1-accumulation-as-a-source-of-neuroinflammation
#5
Charles A Thomas, Leon Tejwani, Cleber A Trujillo, Priscilla D Negraes, Roberto H Herai, Pinar Mesci, Angela Macia, Yanick J Crow, Alysson R Muotri
Three-prime repair exonuclease 1 (TREX1) is an anti-viral enzyme that cleaves nucleic acids in the cytosol, preventing accumulation and a subsequent type I interferon-associated inflammatory response. Autoimmune diseases, including Aicardi-Goutières syndrome (AGS) and systemic lupus erythematosus, can arise when TREX1 function is compromised. AGS is a neuroinflammatory disorder with severe and persistent intellectual and physical problems. Here we generated a human AGS model that recapitulates disease-relevant phenotypes using pluripotent stem cells lacking TREX1...
August 2, 2017: Cell Stem Cell
https://www.readbyqxmd.com/read/28801290/-quinalizarin-induces-apoptosis-in-gastric-cancer-ags-cells-via-mapk-and-akt-signaling-pathway
#6
Chang Liu, Ying-Hua Luo, Xian-Ji Piao, Yue Wang, Ling-Qi Meng, Hao Wang, Jia-Ru Wang, Yi Zhang, Jin-Qian Li, Cheng-Hao Jin
OBJECTIVE: To investigate quinalizarin-induced apoptosis in gastric cancer cells in vitro and explore the molecular mechanisms. METHODS: MTT assay was used to determine the cytotoxic effects of quinalizarin on human gastric cancer AGS, MKN-28 and MKN-45 cells. Annexin V-FITC/PI staining and flow cytometry were used to assess quinalizarin-induced apoptosis in AGS cells and its effect on intracellular ROS levels; the expression levels of apoptotic proteins in the cells were determined with Western blotting...
August 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28791908/synthesis-and-biological-evaluation-of-novel-7-hydroxy-4-phenylchromen-2-one-linked-to-triazole-moieties-as-potent-cytotoxic-agents
#7
Chuan-Feng Liu, Qing-Kun Shen, Jia-Jun Li, Yu-Shun Tian, Zheshan Quan
A new series of novel 7-hydroxy-4-phenylchromen-2-one (1a)-linked 1,2,4-triazoles were synthesised using a click chemistry approach. All derivatives were subjected to 3-(4,5-dimethylthiazol-yl)-diphenyl tetrazolium bromide (MTT) cytotoxicity screening against a panel of six different human cancer cell lines (AGS, MGC-803, HCT-116, A-549, HepG2, and HeLa) to assess their cytotoxic potential. Among the tested molecules, some of the analogues showed better cytotoxic activity than that shown by the 7-hydroxy-4-phenylchromen-2-one (1a)...
December 2017: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/28790087/karyological-patterns-in-the-european-endemic-genus-soldanella-l-absolute-genome-size-variation-uncorrelated-with-cytotype-chromosome-numbers
#8
Eliška Štubňová, Iva Hodálová, Jaromír Kučera, Lenka Mártonfiová, Marek Svitok, Marek Slovák
PREMISE OF THE STUDY: Detailed knowledge about the karyological diversity of organisms undoubtedly represents one of the crucial steps toward a better understanding of their evolutionary trends and history. We investigated the cytotype and absolute genome size (AGS) patterns in the European mountain-dwelling genus Soldanella (Primulaceae) in light of its geographic distribution and ecological diversification. METHODS: Our chromosome number survey was based on 34 newly determined and 125 previously published chromosome counts...
August 8, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28776327/helicobacter-pylori-outer-inflammatory-protein-a-oipa-suppresses-apoptosis-of-ags-gastric-cells-in-vitro
#9
Anis Rageh Al-Maleki, Mun Fai Loke, Sook Yin Lui, Nur Siti Khadijah Ramli, Yalda Khosravi, Chow Goon Ng, Gopinath Venkatraman, Khean-Lee Goh, Bow Ho, Jamuna Vadivelu
Outer Inflammatory Protein A (OipA) is an important virulence factor associated with gastric cancer and ulcer development, however the results has not been well-established and turned out to be controversial. This study aims to elucidate the role of OipA in H. pylori infection using clinical strains harboring oipA "on" and "off" motifs. Proteomics analysis was performed on AGS cell pre and post-infection with H. pylori oipA "on" and "off" strains, using liquid chromatography / mass spectrometry. AGS apoptosis and cell cycle assays were performed...
August 3, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28766245/elevated-expression-of-rpa3-is-involved-in-gastric-cancer-tumorigenesis-and-associated-with-poor-patient-survival
#10
Zhongming Dai, Shufang Wang, Weiping Zhang, Yunsheng Yang
BACKGROUND: The replication protein A3 (RPA3) is a component of the RPA protein complex, which plays an essential role in multiple processes of DNA metabolism. AIMS: However, the involvement of RPA3 in gastric cancer tumorigenesis has not yet been investigated. METHODS: We stably knocked down RPA3 expression using short hairpin RNA in AGS cell line, and performed cell growth, colony formation and soft agar assays. Xenograft experiments were performed to examine tumor promoting properties of RPA3 in vivo...
August 1, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28765692/helicobacter-pylori-vaca-genotype-is-a-predominant-determinant-of-immune-response-to-helicobacter-pylori-caga
#11
Alexander Link, Cosima Langner, Wiebke Schirrmeister, Wiebke Habendorf, Jochen Weigt, Marino Venerito, Ina Tammer, Dirk Schlüter, Philipp Schlaermann, Thomas F Meyer, Thomas Wex, Peter Malfertheiner
AIM: To evaluate the frequency of Helicobacter pylori (H. pylori) CagA antibodies in H. pylori infected subjects and to identify potential histopathological and bacterial factors related to H. pylori CagA-immune response. METHODS: Systematic data to H. pylori isolates, blood samples, gastric biopsies for histological and molecular analyses were available from 99 prospectively recruited subjects. Serological profile (anti-H. pylori, anti-CagA) was correlated with H...
July 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28763772/ph-responsive-chitosan-nanoparticles-from-a-novel-twin-chain-anionic-amphiphile-for-controlled-and-targeted-delivery-of-vancomycin
#12
Rahul S Kalhapure, Mahantesh Jadhav, Sanjeev Rambharose, Chunderika Mocktar, Sanil Singh, Jwala Renukuntla, Thirumala Govender
The design and synthesis of novel pH-responsive nanoantibiotics is an emerging research area to address the antibiotic resistance crisis. The purpose of this study was therefore to synthesize a new anionic gemini surfactant (AGS) that could result in the formulation of pH-responsive chitosan nanoparticles (CSNPs) to treat methicillin-resistant Staphylococcus aureus (MRSA) infections. The coupling of oleic acid with 2,2-dimethyl-5,5-bis(hydroxymethyl)-1,3-dioxane and subsequent deprotection followed by a reaction with succinic anhydride and sodium bicarbonate yielded AGS...
July 24, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28763647/discovery-of-9h-purins-as-potential-tubulin-polymerization-inhibitors-synthesis-biological-evaluation-and-structure-activity-relationships
#13
Zhong-Zhen Zhou, Xiu-Dong Shi, Hong-Fang Feng, Yu-Fang Cheng, Hai-Tao Wang, Jiang-Ping Xu
Two series of N-(4-methoxyphenyl)-N-methyl-9H-purin-6-amines (9a-d and 10a-h) and 9-substituted benzyl-6-chloro-9H-purines (11a-h) were designed and synthesized. Their antiproliferative activities against human myelogenous leukemia (K562), human neuroblastoma (SH-SY5Y) and gastric cancer (AGS) cell lines were evaluated using the MTT assay. The preliminary results indicated that compounds 9d and 11e-h displayed low-micromole GI50 values against all tested cell lines. In addition, compounds 10b and 10d showed wonderful antiproliferative activities towards SH-SY5Y cells with selectivity of >230-fold over K562 and AGS cells...
July 25, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28762473/late-diagnosis-and-atypical-brain-imaging-of-aicardi-gouti%C3%A3-res-syndrome-are-we-failing-to-diagnose-aicardi-gouti%C3%A3-res-syndrome-2
#14
Leah Svingen, Mitchell Goheen, Rena Godfrey, Colleen Wahl, Eva H Baker, William A Gahl, May Christine V Malicdan, Camilo Toro
Aicardi-Goutières syndrome (AGS) is a rare disorder with in utero or postnatal onset of encephalopathy and progressive neurological deterioration. The seven genetic subtypes of AGS are associated with abnormal type I interferon-mediated innate immune response. Most patients with AGS present with progressive microcephaly, spasticity, and cognitive impairment. Some, especially those with type 2 (AGS2), manifest milder phenotypes, reduced childhood mortality, and relative preservation of physical and cognitive abilities...
August 1, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/28759561/regenerating-family-member-4-reg4-enhances-5-fluorouracil-resistance-of-gastric-cancer-through-activating-mapk-erk-bim-signaling-pathway
#15
Jiaoyue Jin, Hang Lv, Junzhou Wu, Dan Li, Kaiyan Chen, Fanrong Zhang, Jing Han, Jianguo Feng, Nan Zhang, Herbert Yu, Dan Su, Lisha Ying
BACKGROUND Reg4, a member of the Reg multigene family, is highly upregulated in many gastrointestinal cancers including gastric cancer (GC). The enhanced expression of Reg4 is associated with the resistance of GC to 5-fluorouracil (5-FU), while the underlying mechanism is not clear. The aim of the present study was to explore the resistant mechanism underlying 5-FU resistance. MATERIAL AND METHODS Reg4 expression was assessed by Western blot analysis for SGC-7901, BGC-823, AGS, MKN28, and MKN45. Synthetic short single strand RNA oligonucleotides and Flag-Reg4 plasmid were used to investigate the biological function of Reg4 in vitro...
July 31, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28753455/diallyl-trisulfide-induces-apoptosis-and-mitotic-arrest-in-ags-human-gastric-carcinoma-cells-through-reactive-oxygen-species-mediated-activation-of-amp-activated-protein-kinase
#16
Yung Hyun Choi
Diallyl trisulfide (DATS), one of the principal constituents of garlic oil, is a kind of organosulfur compound with high anti-cancer activity. Although inhibition of cancer cell proliferation by DATS is known to be associated with the induction of apoptosis and cell cycle arrest related to reactive oxygen species (ROS) production, it is still necessary to study the detailed mechanisms. In this study, we investigated the role of ROS on the activation of AMP-activated protein kinase (AMPK) in DATS-induced apoptosis and cell cycle arrest in AGS human gastric carcinoma cells...
July 25, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28749707/imaging-findings-of-alagille-syndrome-in-young-infants-differentiation-from-biliary-atresia
#17
Solbee Han, Tae Yeon Jeon, Sook Min Hwang, So-Young Yoo, Yon Ho Choe, Suk-Koo Lee, Ji Hye Kim
OBJECTIVES: To compare the imaging findings using ultrasonography, MR cholangiopancreatography (MRCP), and intraoperative cholangiography (IOC) between Alagille syndrome (AGS) and biliary atresia (BA) in young infants with cholestatic jaundice. METHODS: The institutional review board approved this retrospective study. Ultrasonography (n = 55), MRCP (n = 33), and IOC (n = 22) studies were performed in 55 infants (all younger than 3 months) with AGS (n = 7) and BA (n = 48)...
July 27, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28742204/mir-144-functions-as-tumor-suppressor-by-targeting-pim1-in-gastric-cancer
#18
K Ren, Q-Q Liu, Z-F An, D-P Zhang, X-H Chen
OBJECTIVE: Gastric cancer (GC) is one of the most prevalent types of malignant disease Worldwide. Mounting evidence has demonstrated the involvement of miRNAs in the development of GC. One of these miRNAs, miR-144 has been found aberrantly expressed in a variety of human malignancies. PATIENTS AND METHODS: GC tissues were collected from patients, and the level of miR-144 was determined by qRT-PCR. GC cell lines SGC7901 and AGS were used as model cell lines and the anti-tumor effect of miR-144 in both cells were examined...
July 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28739880/neoantigen-expression-in-steady-state-langerhans-cells-induces-ctl-tolerance
#19
Helen Strandt, Douglas Florindo Pinheiro, Daniel H Kaplan, Dagmar Wirth, Iris Karina Gratz, Peter Hammerl, Josef Thalhamer, Angelika Stoecklinger
The skin hosts a variety of dendritic cells (DCs), which act as professional APC to control cutaneous immunity. Langerhans cells (LCs) are the only DC subset in the healthy epidermis. However, due to the complexity of the skin DC network, their relative contribution to either immune activation or immune tolerance is still not entirely understood. To specifically study the function of LCs in vivo, without altering the DC subset composition in the skin, we have generated transgenic mouse models for tamoxifen-inducible de novo expression of Ags in LCs but no other langerin(+) DCs...
July 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28739744/overexpression-of-ephb4-is-associated-with-poor-survival-of-patients-with-gastric-cancer
#20
Jie Yin, Yuxin Cui, Liting Li, Jiafu Ji, Wen G Jiang
BACKGROUND: Increased expression of erythropoietin-producing human hepatoma (EPHB4) leads to enhanced cell migration, growth and adhesion in tumor cells. However, little is known regarding the effects of EPHB4 in gastric cancer. The present study aimed to examine the clinical relevance of EPHB4 and its association with the prognosis of gastric cancer. MATERIALS AND METHODS: EPHB4 transcript expression in 324 gastric cancer samples with paired adjacent normal gastric tissues was determined using quantitative polymerase chain reaction and the results were statistically analyzed against patient clinicopathological data...
August 2017: Anticancer Research
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