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https://www.readbyqxmd.com/read/28340357/ruthenium-complexes-with-phenylterpyridine-derivatives-target-cell-membrane-and-trigger-death-receptors-mediated-apoptosis-in-cancer-cells
#1
Zhiqin Deng, Pan Gao, Lianling Yu, Bin Ma, Yuanyuan You, Leung Chan, Chaoming Mei, Tianfeng Chen
Elucidation of the communication between metal complexes and cell membrane may provide useful information for rational design of metal-based anticancer drugs. Herein we synthesized a novel class of ruthenium (Ru) complexes containing phtpy derivatives (phtpy = phenylterpyridine), analyzed their structure-activity relationship and revealed their action mechanisms. The result showed that, the increase in the planarity of hydrophobic Ru complexes significantly enhanced their lipophilicity and cellular uptake...
March 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28335557/ros-production-and-erk-activity-are-involved-in-the-effects-of-d-%C3%AE-hydroxybutyrate-and-metformin-in-a-glucose-deficient-condition
#2
Santosh Lamichhane, Tonking Bastola, Ramesh Pariyar, Eun-Sol Lee, Ho-Sub Lee, Dae Ho Lee, Jungwon Seo
Hypoglycemia, a complication of insulin or sulfonylurea therapy in diabetic patients, leads to brain damage. Furthermore, glucose replenishment following hypoglycemic coma induces neuronal cell death. In this study, we investigated the molecular mechanism underlying glucose deficiency-induced cytotoxicity and the protective effect of d-β-hydroxybutyrate (D-BHB) using SH-SY5Y cells. The cytotoxic mechanism of metformin under glucose deficiency was also examined. Cell viability under 1 mM glucose (glucose deficiency) was significantly decreased which was accompanied by increased production of reactive oxygen species (ROS) and decreased phosphorylation of extracellular signal-regulated kinase (ERK) and glycogen synthase 3 (GSK3β)...
March 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28334041/virus-mediated-suppression-of-host-non-self-recognition-facilitates-horizontal-transmission-of-heterologous-viruses
#3
Songsong Wu, Jiasen Cheng, Yanping Fu, Tao Chen, Daohong Jiang, Said A Ghabrial, Jiatao Xie
Non-self recognition is a common phenomenon among organisms; it often leads to innate immunity to prevent the invasion of parasites and maintain the genetic polymorphism of organisms. Fungal vegetative incompatibility is a type of non-self recognition which often induces programmed cell death (PCD) and restricts the spread of molecular parasites. It is not clearly known whether virus infection could attenuate non-self recognition among host individuals to facilitate its spread. Here, we report that a hypovirulence-associated mycoreovirus, named Sclerotinia sclerotiorum mycoreovirus 4 (SsMYRV4), could suppress host non-self recognition and facilitate horizontal transmission of heterologous viruses...
March 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28333374/odontoclastogenesis-of-mouse-papilla-derived-mdpc-23-cells-induced-by-lps
#4
C Li, W T Qi, H W Jiang
AIM: To investigate the role of LPS in the odontoclast differentiation of MDPC-23 cells. It was hypothesized that MDPC 23 odontoblast-like cells may function as odontoclasts under the influence of LPS. METHODOLOGY: MDPC-23 cells were cultured in the presence of 0.1 or 1 μg/mL LPS for 6 days. Cell viability was determined using the CCK8 assay. TRAP staining, dentine resorption assay and ROS detection by confocal laser scanning microscope were used to test the odontoclast-like function of the induced cells...
March 23, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28333148/salusin-%C3%AE-contributes-to-oxidative-stress-and-inflammation-in-diabetic-cardiomyopathy
#5
Ming-Xia Zhao, Bing Zhou, Li Ling, Xiao-Qing Xiong, Feng Zhang, Qi Chen, Yue-Hua Li, Yu-Ming Kang, Guo-Qing Zhu
Salusin-β accelerates inflammatory responses in vascular endothelial cells, and increases oxidative stress in vascular smooth muscle cells. Plasma salusin-β levels were increased in diabetic patients. This study was designed to determine whether salusin-β is involved in the pathogenesis of diabetic cardiomyopathy (DCM), and whether knockdown of salusin-β attenuates cardiac inflammation and oxidative stress in rats with DCM. H9c2 or neonatal rat cardiomyocytes were incubated with 33.3 mM of glucose to mimic the high glucose (HG) in diabetes...
March 23, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28333068/effects-of-reactive-oxygen-species-on-tubular-transport-along-the-nephron
#6
REVIEW
Agustin Gonzalez-Vicente, Jeffrey L Garvin
Reactive oxygen species (ROS) are oxygen-containing molecules naturally occurring in both inorganic and biological chemical systems. Due to their high reactivity and potentially damaging effects to biomolecules, cells express a battery of enzymes to rapidly metabolize them to innocuous intermediaries. Initially, ROS were considered by biologists as dangerous byproducts of respiration capable of causing oxidative stress, a condition in which overproduction of ROS leads to a reduction in protective molecules and enzymes and consequent damage to lipids, proteins, and DNA...
March 23, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28332701/the-epigenetic-landscape-related-to-reactive-oxygen-species-formation-in-the-cardiovascular-system
#7
REVIEW
Thomas Kietzmann, Andreas Petry, Antonina Shvetsova, Joachim M Gerhold, Agnes Görlach
Cardiovascular diseases are the leading cause of death worldwide. Reactive oxygen species (ROS) can act as damaging molecules but also represent central hubs in cellular signalling networks. Increasing evidence indicates that ROS play an important role in the pathogenesis of cardiovascular diseases, although the underlying mechanisms and consequences of pathophysiological elevated ROS in the cardiovascular system are still not completely resolved. More recently, alterations of the epigenetic landscape which can affect DNA methylation, post-translational histone modifications, ATP-dependent alterations to chromatin and non-coding RNA transcripts, have been considered to be of increasing importance in the pathogenesis of cardiovascular diseases...
March 23, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28330872/nadph-oxidase-1-supports-proliferation-of-colon-cancer-cells-by-modulating-reactive-oxygen-species-dependent-signal-transduction
#8
Agnes Juhasz, Susan Markel, Shikha Gaur, Han Liu, Jiamo Lu, Guojian Jiang, Xiwei Wu, Smitha Antony, Yongzhong Wu, Giovanni Melillo, Jennifer L Meitzler, Diana C Haines, Donna Butcher, Krishnendu Roy, James H Doroshow
Reactive oxygen species (ROS) play a critical role in cell signaling and proliferation. NADPH oxidase 1 (NOX1), a membrane-bound flavin dehydrogenase that generates superoxide, is highly expressed in colon cancer. To investigate the role that NOX1 plays in colon cancer growth, we used shRNA to decrease NOX1 expression stably in HT-29 human colon cancer cells. The 80-90% decrease in NOX1 expression achieved by RNAi produced a significant decline in ROS production and a G1/S block that translated into a 2-3-fold increase in tumor cell doubling time without increased apoptosis...
March 22, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28330870/nuclear-factor-erythroid-2-related-factor-2-enhances-carcinogenesis-by-suppressing-apoptosis-and-promoting-autophagy-in-nickel-transformed-cells
#9
Young-Ok Son, Poyil Pratheeshkumar, Sasidharan Padmaja Divya, Zhuo Zhang, Xianglin Shi
Nickel-containing compounds are used widely in industry. Nickel is a known human carcinogen that primarily targets the lungs. Proposed mechanisms of nickel-induced carcinogenesis include disruption of cellular iron homeostasis, generation of reactive oxygen species (ROS), and induction of hypoxia signaling. The precise molecular mechanisms of nickel-induced malignant transformation and tumor development remain unclear. This study shows that the transcription factor Nrf2 is highly expressed in lung tumor tissue and in nickel-transformed human lung bronchial epithelial BEAS-2B cells (NiT cells)...
March 22, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28330789/schiff-bases-of-putrescine-with-methylglyoxal-protect-from-cellular-damage-caused-by-accumulation-of-methylglyoxal-and-reactive-oxygen-species-in-dictyostelium-discoideum
#10
Seong-Jun Park, Min-Kyu Kwak, Sa-Ouk Kang
Polyamines protect protein glycation in cells against the advanced glycation end product precursor methylglyoxal, which is inevitably produced during glycolysis, and the enzymes that detoxify this α-ketoaldehyde have been widely studied. Nonetheless, nonenzymatic methylglyoxal-scavenging molecules have not been sufficiently studied either in vitro or in vivo. Here, we hypothesized reciprocal regulation between polyamines and methylglyoxal modeled in Dictyostelium grown in a high-glucose medium. We based our hypothesis on the reaction between putrescine and methylglyoxal in putrescine-deficient (odc(-)) or putrescine-overexpressing (odc(oe)) cells...
March 18, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28328989/quorum-sensing-network-in-clinical-strains-of-a-baumannii-aida-is-a-new-quorum-quenching-enzyme
#11
María López, Celia Mayer, Laura Fernández-García, Lucía Blasco, Andrea Muras, Federico Martín Ruiz, German Bou, Ana Otero, María Tomás
Acinetobacter baumannii is an important pathogen that causes nosocomial infections generally associated with high mortality and morbidity in Intensive Care Units (ICUs). Currently, little is known about the Quorum Sensing (QS)/Quorum Quenching (QQ) systems of this pathogen. We analyzed these mechanisms in seven clinical isolates of A. baumannii. Microarray analysis of one of these clinical isolates, Ab1 (A. baumannii ST-2_clon_2010), previously cultured in the presence of 3-oxo-C12-HSL (a QS signalling molecule) revealed a putative QQ enzyme (α/ß hydrolase gene, AidA)...
2017: PloS One
https://www.readbyqxmd.com/read/28328867/astragaloside-iv-alleviates-lipopolysaccharide-induced-acute-kidney-injury-through-down-regulating-cytokines-ccr5-and-p-erk-and-elevating-anti-oxidative-ability
#12
Wei Zhou, Yi Chen, Xingyu Zhang
BACKGROUND Astragaloside IV (AS-IV) has been shown to prevent ischemia-induced acute kidney injury (AKI) in rat models of ischemia and reperfusion. However, the effects of AS-IV on AKI during sepsis and endotoxinemia is unclear. The current study aimed to investigate the effects and molecular mechanisms of AS-IV on lipopolysaccharide (LPS)-induced AKI. MATERIAL AND METHODS Adult male CD-1 mice were randomly assigned into 6 groups (n=8/group): control group: mice were intraperitoneally (i.p.) injected with normal saline; LPS group (10 mg/kg, i...
March 22, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28326554/chlamydomonas-reinhardtii-responding-to-high-light-a-role-for-2-propenal-acrolein
#13
Thomas Roach, Theresa Baur, Wolfgang Stöggl, Anja Krieger-Liszkay
High light causes photosystem II to generate singlet oxygen ((1) O2 ), a reactive oxygen species (ROS) that can react with membrane lipids, releasing reactive electrophile species (RES), such as acrolein. To investigate how RES may contribute to light stress responses, Chlamydomonas reinhardtii was high light-treated in photoautotrophic and mixotrophic conditions and also in an oxygen-enriched atmosphere to elevate ROS production. The responses were compared to exogenous acrolein. Non-photochemical quenching (NPQ) was higher in photoautotrophic cells, as a consequence of a more de-epoxidized state of the xanthophyll cycle pool and more LHCSR3 protein, showing that photosynthesis was under more pressure than in mixotrophic cells...
March 21, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28326085/dectin-1-compromises-innate-responses-and-host-resistance-against-neospora-caninum-infection
#14
Murilo Vieira da Silva, Flávia Batista Ferreira França, Caroline Martins Mota, Arlindo Gomes de Macedo Júnior, Eliézer Lucas Pires Ramos, Fernanda Maria Santiago, José Roberto Mineo, Tiago Wilson Patriarca Mineo
Neospora caninum is an intracellular protozoan parasite that has drawn increasing interest due to its association with worldwide repetitive bovine abortions, which cause billionaire losses to the meat and dairy industries annually. Innate immunity plays an important role in infection control, and N. caninum activates the production of inflammatory mediators through toll-like receptors, NOD-like receptors, and mitogen-activated protein kinase signaling pathways. Advances in the knowledge of initial host-parasite interactions are desirable for the design of control measures against the infection, obliterating its pathogenesis...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28325787/impaired-defenses-of-neonatal-mouse-alveolar-macrophage-with-cftr-deletion-are-modulated-by-glutathione-and-tgf%C3%AE-1
#15
Theresa W Gauthier, Jocelyn R Grunwell, Xiao-Du Ping, Frank L Harris, Lou Ann S Brown
Our understanding of the intrinsic effects of cystic fibrosis (CF) transmembrane conductance regulator (cftr) deletion on resident neonatal alveolar macrophage (AM) remains limited. We previously demonstrated that diminished glutathione (GSH) or excessive AM transforming growth factor beta one (TGFβ1) contributes to AM dysfunction in a variety of disease states. In this study, using a gut-corrected cftr neonatal knockout (KO) mouse model and a siRNA-manipulated macrophage-like cell line (THP-1 cell), we hypothesized (1) that cftr mutation alone increases neonatal AM oxidant stress and cellular TGFβ1 signaling via altered GSH, thereby impairing cellular function, and (2) that exogenous GSH attenuates AM alterations and dysfunction in the KO AM In neonatal KO mice, the baseline bronchoalveolar lavage fluid demonstrated a near doubling in mixed disulfides (P ≤ 0...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28325500/mitochondrial-reactive-oxygen-species-are-involved-in-chemoattractant-induced-oxidative-burst-and-degranulation-of-human-neutrophils-in-vitro
#16
Nina Vorobjeva, Anastasia Prikhodko, Ivan Galkin, Olga Pletjushkina, Roman Zinovkin, Galina Sud'ina, Boris Chernyak, Boris Pinegin
Activation of neutrophils is accompanied by the oxidative burst, exocytosis of various granule types (degranulation) and a delay in spontaneous apoptosis. The major source of reactive oxygen species (ROS) in human neutrophils is NADPH oxidase (NOX2), however, other sources of ROS also exist. Although the function of ROS is mainly defensive, they can also play a regulatory role in cell signaling. However, the contribution of various sources of ROS in these processes is not clear. We investigated a possible role of mitochondria-derived ROS (mtROS) in the regulation of neutrophil activation induced by chemoattractant fMLP in vitro...
March 10, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28325262/the-roles-of-reactive-oxygen-species-ros-and-autophagy-in-the-survival-and-death-of-leukemia-cells
#17
REVIEW
Yong-Feng Chen, Hao Liu, Xin-Jing Luo, Zhiqiang Zhao, Zhen-You Zou, Jing Li, Xiao-Jing Lin, Yong Liang
As a clonal disease of hematopoietic stem cells (HSCs), the etiology and pathogenesis of leukemia is not fully understood. Recent studies suggest that cellular homeostasis plays an essential role in maintaining the function of HSCs because dysregulation of cellular homeostasis is one of the major factors underlying the malignant transformation of HSCs. Reactive oxygen species (ROS) and autophagy, key factors regulating cellular homeostasis, are commonly observed in the human body. Autophagy can be induced by ROS through a variety of signaling pathways, and conversely inhibits ROS-induced damage to cells and tissues...
April 2017: Critical Reviews in Oncology/hematology
https://www.readbyqxmd.com/read/28323898/perfluorocarbon-reduces-cell-damage-from-blast-injury-by-inhibiting-signal-paths-of-nf-%C3%AE%C2%BAb-mapk-and-bcl-2-bax-signaling-pathway-in-a549-cells
#18
Zhaorui Zhang, Zhixin Liang, Huaidong Li, Chunsun Li, Zhen Yang, Yanqin Li, Danyang She, Lu Cao, Wenjie Wang, Changlin Liu, Liangan Chen
BACKGROUND AND OBJECTIVE: Blast lung injury is a common type of blast injury and has very high mortality. Therefore, research to identify medical therapies for blast injury is important. Perfluorocarbon (PFC) is used to improve gas exchange in diseased lungs and has anti-inflammatory functions in vitro and in vivo. The aim of this study was to determine whether PFC reduces damage to A549 cells caused by blast injury and to elucidate its possible mechanisms of action. STUDY DESIGN AND METHODS: A549 alveolar epithelial cells exposed to blast waves were treated with and without PFC...
2017: PloS One
https://www.readbyqxmd.com/read/28323614/a-chloroplast-retrograde-signal-3-phosphoadenosine-5-phosphate-acts-as-a-secondary-messenger-in-abscisic-acid-signaling-in-stomatal-closure-and-germination
#19
Wannarat Pornsiriwong, Gonzalo M Estavillo, Kai Xun Chan, Estee E Tee, Diep Ganguly, Peter A Crisp, Su Yin Phua, Chenchen Zhao, Jiaen Qiu, Jiyoung Park, Miing Tiem Yong, Nazia Nisar, Arun Kumar Yadav, Benjamin Schwessinger, John Rathjen, Christopher I Cazzonelli, Philippa B Wilson, Matthew Gilliham, Zhong-Hua Chen, Barry J Pogson
Organelle-nuclear retrograde signaling regulates gene expression, but its roles in specialized cells and integration with hormonal signaling remain enigmatic. Here we show that the SAL1-PAP (3'-phosphoadenosine 5'- phosphate) retrograde pathway interacts with abscisic acid (ABA) signaling to regulate stomatal closure and seed germination in Arabidopsis. Genetically or exogenously manipulating PAP bypasses the canonical signaling components ABA Insensitive 1 (ABI1) and Open Stomata 1 (OST1); priming an alternative pathway that restores ABA-responsive gene expression, ROS bursts, ion channel function, stomatal closure and drought tolerance in ost1-2...
March 21, 2017: ELife
https://www.readbyqxmd.com/read/28323129/peroxiredoxin-2-regulates-pgf2%C3%AE-induced-corpus-luteum-regression-in-mice-by-inhibiting-ros-dependent-jnk-activation
#20
Sun-Ji Park, Jung-Hak Kim, Tae-Shin Kim, Sang-Rae Lee, Jeen-Woo Park, Seunghoon Lee, Jin-Man Kim, Dong-Seok Lee
Luteal regression is a natural and necessary event to regulate the reproductive process in all mammals. Prostaglandin F2α (PGF2α) is the main factor that causes functional and structural regression of the corpus luteum (CL). It is well known that PGF2α-mediated ROS generation is closely involved in luteal regression. Peroxiredoxin 2 (Prx2) as an antioxidant enzyme plays a protective role against oxidative stress-induced cell death. However, the effect of Prx2 on PGF2α-induced luteal regression has not been reported...
March 18, 2017: Free Radical Biology & Medicine
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