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https://www.readbyqxmd.com/read/27920779/functional-versatility-of-agy-serine-codons-in-immunoglobulin-variable-region-genes
#1
Thiago Detanico, Matthew Phillips, Lawrence J Wysocki
In systemic autoimmunity, autoantibodies directed against nuclear antigens (Ags) often arise by somatic hypermutation (SHM) that converts AGT and AGC (AGY) Ser codons into Arg codons. This can occur by three different single-base changes. Curiously, AGY Ser codons are far more abundant in complementarity-determining regions (CDRs) of IgV-region genes than expected for random codon use or from species-specific codon frequency data. CDR AGY codons are also more abundant than TCN Ser codons. We show that these trends hold even in cartilaginous fishes...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27920769/transcriptional-profiling-of-type-ii-toxin-antitoxin-genes-of-helicobacter-pylori-under-different-environmental-conditions-identification-of-hp0967-hp0968-system
#2
María G Cárdenas-Mondragón, Miguel A Ares, Leonardo G Panunzi, Sabino Pacheco, Margarita Camorlinga-Ponce, Jorge A Girón, Javier Torres, Miguel A De la Cruz
Helicobacter pylori is a Gram-negative bacterium that colonizes the human gastric mucosa and is responsible for causing peptic ulcers and gastric carcinoma. The expression of virulence factors allows the persistence of H. pylori in the stomach, which results in a chronic, sometimes uncontrolled inflammatory response. Type II toxin-antitoxin (TA) systems have emerged as important virulence factors in many pathogenic bacteria. Three type II TA systems have previously been identified in the genome of H. pylori 26695: HP0315-HP0316, HP0892-HP0893, and HP0894-HP0895...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27914788/claudin-6-enhances-cell-invasiveness-through-claudin-1-in-ags-human-adenocarcinoma-gastric-cancer-cells
#3
A C Torres-Martínez, J F Gallardo-Vera, A N Lara-Holguin, L F Montaño, E P Rendón-Huerta
Claudins participate in tissue barrier function. The loss of this barrier is associated to metalloproteases-related extracellular matrix and basal membranes degradation. Claudin-1 is a pro-MMP-2 activator and claudin-6 transfected AGS (AGS-Cld6) cells are highly invasive. Our aim was to determine if claudin-6 was direct or indirectly associated with MMP-2 activation and cell invasiveness. Cytofluorometry, cell fractioning, immunoprecipitation, gelatin-zymography, cell migration and invasiveness assays were performed, claudin-2, -6, -7 and -9 transfected AGS cells, anti-MMP-2, -9 and -14, anti-claudins specific antibodies and claudin-1 small interfering RNA were used...
November 30, 2016: Experimental Cell Research
https://www.readbyqxmd.com/read/27907210/assessing-potentially-inappropriate-prescribing-in-community-dwelling-older-patients-using-the-updated-version-of-stopp-start-criteria-a-comparison-of-profiles-and-prevalences-with-respect-to-the-original-version
#4
Encarnación Blanco-Reina, Maria Rosa García-Merino, Ricardo Ocaña-Riola, Lorena Aguilar-Cano, Jennifer Valdellós, Inmaculada Bellido-Estévez, Gabriel Ariza-Zafra
Emerging and changing evidence made it necessary to update STOPP-START criteria, and version 2 was published recently. In this study the objectives were to determine the prevalence of potentially inappropriate medication prescribing (PIM) in primary care using STOPP versions 1 (v1) and 2 (v2), as well as 2012 AGS Beers criteria, and analyze the factors associated with inappropriate prescribing according to STOPP/START v2. A cross-sectional study was carried out including community-dwelling older adults over the age of 65...
2016: PloS One
https://www.readbyqxmd.com/read/27905872/knockdown-of-ggct-inhibits-cell-proliferation-and-induces-late-apoptosis-in-human-gastric-cancer
#5
Wenjie Zhang, Lei Chen, Honggang Xiang, Chunhua Hu, Weibin Shi, Ping Dong, Wenjie Lv
BACKGROUND: Gamma glutamylcyclotransferase (GGCT) has been proved to be involved in various cancers, but the biological function of GGCT in gastric cancer is still largely unknown. METHODS: The expression level of GGCT was evaluated by informatics analyses based on the Oncomine database. GGCT gene was then effectively knocked down via lentivirus mediated short hairpin RNA (shRNA) system. Then a series of functional assays, including MTT, colony formation and flow cytometry analysis were conducted on gastric cancer cells following GGCT knockdown...
December 1, 2016: BMC Biochemistry
https://www.readbyqxmd.com/read/27904131/mir-31-regulates-rho-associated-kinase-myosin-light-chain-rock-mlc-pathway-and-inhibits-gastric-cancer-invasion-roles-of-rhoa
#6
Zhuo Chen, Shengnan Liu, Yuan Xia, Kejian Wu
BACKGROUND This study evaluated how the expression of miR-31 can be used to detect gastric cancer (GC) to help illuminate the role of miR-31 and RhoA in GC cells. MATERIAL AND METHODS We carried out our experiments using tissue specimens from 70 GC patients. The relative expression of miR-31 and RhoA mRNA in tissues and cells was detected by RT-PCR. The expression level of RhoA protein was detected by immunohistochemistry. GC cell line BGC-823 was transfected with six groups of vectors: blank group, NC (negative control) group, miR-31 mimics group, miR-31 mimics + RhoA group, miR-31 mimics + ROCK group, and miR-31 mimics + MLCK agonist group...
December 1, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/27895802/vitamin-c-induces-apoptosis-in-ags-cells-via-production-of-ros-of-mitochondria
#7
Jae Young Lim, Donghyun Kim, Bok Ran Kim, Jin Su Jun, Jung Sook Yeom, Ji Sook Park, Ji-Hyun Seo, Chan Hoo Park, Hyang Ok Woo, Hee-Shang Youn, Seung-Chul Baik, Woo-Kon Lee, Myung-Je Cho, Kwang-Ho Rhee
It has been demonstrated that vitamin C exhibits anti-cancer activity in various tumor cell lines; however, its specific mechanism of action remains unknown. Although the diagnosis and therapy of cancer patients have markedly improved in recent years, safer and more cost-effective treatments are still required. Therefore, the present study examined the effect of vitamin C on the induction of cell death in gastric cancer and its underlying mechanism of action. It was observed that the cytotoxicity of vitamin C on the human gastric cancer cell line AGS is dependent on the apoptotic pathway, including caspase cascades, but not on the necroptotic pathway...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27895177/ox40-cooperates-with-icos-to-amplify-follicular-th-cell-development-and-germinal-center-reactions-during-infection
#8
Vikas Tahiliani, Tarun E Hutchinson, Georges Abboud, Michael Croft, Shahram Salek-Ardakani
Cognate interactions between T follicular helper (Tfh) cells and B cells are essential for promoting protective Ab responses. Whereas costimulatory receptors such as ICOS are accepted as being important for the induction of Tfh cell fate decision, other molecules may play key roles in amplifying or maintaining the Tfh phenotype. In this study, with vaccinia virus infection in mice, we show that OX40 was expressed on Tfh cells that accumulated at the T/B borders in the white pulp of the spleen and that OX40-dependent signals directly shaped the magnitude and quality of the their response to viral Ags...
November 28, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27892675/purification-of-cucurbitacins-d-e-and-i-from-ecballium-elaterium-l-a-rich-fruits-and-study-of-their-cytotoxic-effects-on-the-ags-cell-line
#9
Naser Jafargholizadeh, Seyed Jalal Zargar, Narguess Yassa, Saeed Tavakoli
Background: The plant Ecballium elaterium (L.) A. Rich, belongs to the Cucurbitaceae family which occupies an important position in traditional medicine prescriptions. It has been reported that a freeze-dried aqueous extract of E. elaterium fruits has cytotoxic effects on the AGS human stomach adenocarcinoma cell line. We here focused on anticancer effects of the main chemicals purified from E. elaterium fruits. Materials and Methods: We isolated cucurbitacins D, E, and I from chloroform, and ethyl acetate fractions of a methanolic extract of E...
January 10, 2016: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/27885462/the-cytoprotective-effect-of-rumex-aquaticus-herba-extract-against-hydrogen-peroxide-induced-oxidative-stress-in-ags-cells
#10
Eun Jeong Cho, Seung In Um, Jeong Hoon Han, Byeonghee Kim, Sang Beom Han, Ji Hoon Jeong, Hak Rim Kim, Inkyeom Kim, Wan Kyun Whang, Eunhwa Lee, Uy Dong Sohn
The Rumex Aquaticus Herba extract containing quercetin-3-β-D-glucuronopyranoside (ECQ) has been reported to exhibit various pharmacological activities, including anti-inflammatory and anti-oxidative effects. This plant has been traditionally used for the treatment of diarrhea, disinfestation, edema and jaundice, and as an antipyretic drug. The aim of the present study was to investigate the ability of ECQ to protect against oxidative damage and to determine its signaling mechanism in AGS cells. The protein expressions of heme oxygenase-1 (HO-1) and nuclear factor-erythroid 2 related factor 2 (Nrf2) were measured by Western blots...
November 24, 2016: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/27882131/role-of-peptidylarginine-deiminase-type-4-in-gastric-cancer
#11
Jiang Xin, Xiuqi Song
Peptidylarginine deiminase type 4 (PADI4) post-translationally converts peptidylarginine to citrulline, appearing to be overexpressed in numerous carcinomas. The current study aimed to investigate the expression of PADI4 in gastric cancer tissues and its effect on the biological activities of SGC-7901 and AGS tumor cell lines. The expression of PADI4 was determined in gastric cancer and normal gastric mucosa tissues using western blot analysis and reverse transcription-quantitative polymerase chain reaction...
November 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27874181/ags-position-statement-making-medical-treatment-decisions-for-unbefriended-older-adults
#12
Timothy W Farrell, Eric Widera, Lisa Rosenberg, Craig D Rubin, Aanand D Naik, Ursula Braun, Alexia Torke, Ina Li, Caroline Vitale, Joseph Shega
In this position statement, we define unbefriended older adults as patients who: (1) lack decisional capacity to provide informed consent to the medical treatment at hand; (2) have not executed an advance directive that addresses the medical treatment at hand and lack capacity to do so; and (3) lack family, friends or a legally authorized surrogate to assist in the medical decision-making process. Given the vulnerable nature of this population, clinicians, health care teams, ethics committees and other stakeholders working with unbefriended older adults must be diligent when formulating treatment decisions on their behalf...
November 22, 2016: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/27867537/aquaporin-3-facilitates-chemoresistance-in-gastric-cancer-cells-to-cisplatin-via-autophagy
#13
Xuqiang Dong, Yao Wang, Yangchun Zhou, Jianfei Wen, Shoulin Wang, Lizong Shen
Cisplatin (cDDP) remains one of the first-line chemotherapeutic agents for gastric cancer (GC) treatment, and resistance to cDDP is the major limitation in its clinical application. Mechanisms of cDDP resistance have been shown to be varied and complicated. Aquaporin 3 (AQP3) has been demonstrated to be overexpressed in GC tissues and is thought to be involved in GC carcinogenesis and progression. However, the role of AQP3 in chemosensitivity of GC to cytotoxic agents remains unknown. In this study, we show that AQP3 overexpression induced resistance to cDDP in AGS cells (P<0...
2016: Cell Death Discovery
https://www.readbyqxmd.com/read/27866229/vascular-epiphytes-and-host-trees-of-ant-gardens-in-an-anthropic-landscape-in-southeastern-mexico
#14
Jonas Morales-Linares, José G García-Franco, Alejandro Flores-Palacios, Jorge E Valenzuela-González, Martín Mata-Rosas, Cecilia Díaz-Castelazo
Ant-gardens (AGs) are considered one of the most complex mutualist systems between ants and plants, since interactions involving dispersal, protection, and nutrition occur simultaneously in them; however, little is known about the effects of the transformation of ecosystems on their diversity and interactions. In five environments with different land use within an anthropic landscape in southeastern Mexico, we investigated the diversity and composition of epiphytes and host trees of AGs built by Azteca gnava...
December 2016: Die Naturwissenschaften
https://www.readbyqxmd.com/read/27866080/highly-sensitive-detection-of-cancer-cells-with-an-electrochemical-cytosensor-based-on-boronic-acid-functional-polythiophene
#15
Muamer Dervisevic, Mehmet Senel, Tugba Sagir, Sevim Isik
The detection of cancer cells through important molecular recognition target such as sialic acid is significant for the clinical diagnosis and treatment. There are many electrochemical cytosensors developed for cancer cells detection but most of them have complicated fabrication processes which results in poor reproducibility and reliability. In this study, a simple, low-cost, and highly sensitive electrochemical cytosensor was designed based on boronic acid-functionalized polythiophene. In cytosensors fabrication simple single-step procedure was used which includes coating pencil graphite electrode (PGE) by means of electro-polymerization of 3-Thienyl boronic acid and Thiophen...
November 15, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27863149/cgas-expression-in-patients-with-systemic-lupus-erythematosus
#16
Jie An, Laura Durcan, Reynold M Karr, Tracy A Briggs, Gillian I Rice, Thomas H Teal, Joshua J Woodward, Keith B Elkon
OBJECTIVES Type I interferon (IFN-I) is implicated in the pathogenesis of Systemic Lupus Erythematosus (SLE) and 'interferonopathies' such as Aicardi-Goutieres Syndrome. A recently discovered DNA-activated IFN-I pathway, cyclic GMP-AMP (cGAMP) synthase (cGAS) is linked to AGS and mouse models of lupus. The aim of this study was to determine whether the cGAS pathway contributes to IFN-I production in SLE patients. METHODS SLE disease activity was measured by SELENA-SLEDAI. cGAS and interferon stimulated gene (ISG) mRNA expression was quantified by quantitative PCR ...
November 18, 2016: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/27862371/helicobacter-pylori-infection-modulates-the-expression-of-mirnas-associated-with-dna-mismatch-repair-pathway
#17
Juliana C Santos, Mitsue T Brianti, Victor R Almeida, Manoela M Ortega, Wolfgang Fischer, Rainer Haas, Ander Matheu, Marcelo L Ribeiro
Genetic and epigenetic inactivation of DNA mismatch repair (MMR) genes might lead to modifications in cancer-related gene expression and cancer development. Recently, it has been shown that the infection by Helicobacter pylori (H. pylori), the major causative agent of gastric cancer, induces DNA damage and inhibits MMR DNA repair. Also, it has been reported that microRNAs (miRs) have an important role in regulating genomic stability and MMR DNA repair. Thus, the aim of this study was to identify miRs regulating MMR pathway in H...
November 15, 2016: Molecular Carcinogenesis
https://www.readbyqxmd.com/read/27858974/report-and-research-agenda-of-the-american-geriatrics-society-and-national-institute-on-aging-bedside-to-bench-conference-on-sleep-circadian-rhythms-and-aging-new-avenues-for-improving-brain-health-physical-health-and-functioning
#18
Constance H Fung, Michael V Vitiello, Cathy A Alessi, George A Kuchel
The American Geriatrics Society, with support from the National Institute on Aging and other funders, held its eighth Bedside-to-Bench research conference, entitled "Sleep, Circadian Rhythms, and Aging: New Avenues for Improving Brain Health, Physical Health and Functioning," October 4 to 6, 2015, in Bethesda, Maryland. Part of a conference series addressing three common geriatric syndromes-delirium, sleep and circadian rhythm (SCR) disturbance, and voiding dysfunction-the series highlighted relationships and pertinent clinical and pathophysiological commonalities between these three geriatric syndromes...
November 14, 2016: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/27853354/development-of-novel-her2-inhibitors-against-gastric-cancer-derived-from-flavonoid-source-of-syzygium-alternifolium-through-molecular-dynamics-and-pharmacophore-based-screening
#19
Tirumalasetty Muni Chandra Babu, Aluru Rammohan, Vijaya Bhaskar Baki, Savita Devi, Duvvuru Gunasekar, Wudayagiri Rajendra
Continuous usage of synthetic chemotherapeutic drugs causes adverse effects, which prompted for the development of alternative therapeutics for gastric cancer from natural source. This study was carried out with a specific aim to screen gastroprotective compounds from the fruits of Syzygium alternifolium (Myrtaceae). Three flavonoids, namely, 1) 5-hydroxy-7,4'-dimethoxy-6,8-di-C-methylflavone, 2) kaempferol-3-O-β-d-glucopyranoside, and 3) kaempferol-3-O-α-l-rhamnopyranoside were isolated from the above medicinal plant by employing silica gel column chromatography and are characterized by NMR techniques...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27852743/immunogenic-dendritic-cell-generation-from-pluripotent-stem-cells-by-ectopic-expression-of-runx3
#20
Erika Takacs, Pal Boto, Emilia Simo, Tamas I Csuth, Bianka M Toth, Hadas Raveh-Amit, Attila Pap, Elek G Kovács, Julianna Kobolak, Szilvia Benkö, Andras Dinnyes, Istvan Szatmari
Application of dendritic cells (DCs) to prime responses to tumor Ags provides a promising approach to immunotherapy. However, only a limited number of DCs can be manufactured from adult precursors. In contrast, pluripotent embryonic stem (ES) cells represent an inexhaustible source for DC production, although it remains a major challenge to steer directional differentiation because ES cell-derived cells are typically immature with impaired functional capacity. Consistent with this notion, we found that mouse ES cell-derived DCs (ES-DCs) represented less mature cells compared with bone marrow-derived DCs...
November 16, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
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