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https://www.readbyqxmd.com/read/28545257/the-reactive-sulfur-species-concept-15-years-on
#1
REVIEW
Gregory I Giles, Muhammad Jawad Nasim, Wesam Ali, Claus Jacob
Fifteen years ago, in 2001, the concept of "Reactive Sulfur Species" or RSS was advocated as a working hypothesis. Since then various organic as well as inorganic RSS have attracted considerable interest and stimulated many new and often unexpected avenues in research and product development. During this time, it has become apparent that molecules with sulfur-containing functional groups are not just the passive "victims" of oxidative stress or simple conveyors of signals in cells, but can also be stressors in their own right, with pivotal roles in cellular function and homeostasis...
May 23, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28545243/ficus-umbellata-vahl-moraceae-stem-bark-extracts-exert-antitumor-activities-in-vitro-and-in-vivo
#2
Kevine Kamga Silihe, Stéphane Zingue, Evelyn Winter, Charline Florence Awounfack, Anupam Bishayee, Nishil N Desai, Leônidas João Mello, Thomas Michel, Francine Nzufo Tankeu, Derek Tantoh Ndinteh, Sara Honorine Riwom, Dieudonné Njamen, Tânia Beatriz Creczynski-Pasa
A Ficus umbellata is used to treat cancer. The present work was therefore designed to assess antitumor potentials of F. umbellata extracts in nine different cell lines. Cell cycle, apoptosis, cell migration/invasion, levels of reactive oxygen species (ROS), mitochondrial membrane potential (MMP), caspases activities as well as Bcl-2 and Bcl-xL protein content were assessed in MDA-MB-231 cells. The 7,12-dimethylbenz(a)anthracene (DMBA)-induced carcinogenesis in rats were also used to investigate antitumor potential of F...
May 23, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28545210/response-of-microcystis-aeruginosa-bccusp-232-to-barley-hordeum-vulgare-l-straw-degradation-extract-and-fractions
#3
Gustavo Franciscatti Mecina, Anne Lígia Dokkedal, Luiz Leonardo Saldanha, Mathias Ahii Chia, Micheline Kézia Cordeiro-Araújo, Maria do Carmo Bittencourt-Oliveira, Regildo Márcio Gonçalves da Silva
The eutrophication of aquatic ecosystems is a serious environmental problem that leads to increased frequency of cyanobacterial blooms and concentrations of cyanotoxins. These changes in aquatic chemistry can negatively affect animal and human health. Environment-friendly methods are needed to control bloom forming cyanobacteria. We investigated the effect of Hordeum vulgare L. (barley) straw degradation extract and its fractions on the growth, oxidative stress, antioxidant enzyme activities, and microcystins content of Microcystis aeruginosa (Kützing) Kützing BCCUSP232...
May 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28545188/clinacanthus-nutans-hexane-extracts-induce-apoptosis-through-a-caspase-dependent-pathway-in-human-cancer-cell-lines
#4
Pei Ying Ng, Soi Moi Chye, Chew Hee Ng, Rhun Yian Koh, Yee Lian Tiong, Liew Phing Pui, Yong Hui Tan, Crystale Siew Ying Lim, Khuen Yen Ng
Background: Clinacanthus nutans (C.nutans) is a plant consumed as a cancer treatment in tropical Asia. Despite the availability of numerous anecdotal reports, evaluation of active anticancer effects has remained elusive. Therefore we here examined antiproliferative, reactive oxygen species (ROS)-inducing and apoptosis mechanisms of whole plant extracts in different cancer cell lines. Methods: Antiproliferative actions of five solvent extracts (hexane, chloroform, ethyl acetate, methanol and water) of C.nutans were tested on non-small cell lung cancer (A549), nasopharygeal cancer (CNE1) and liver cancer (HepG2) cells using MTT assay...
April 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28545088/transcriptional-activation-of-hif-1-by-a-ros-erk-axis-underlies-the-resistance-to-photodynamic-therapy
#5
María Julia Lamberti, María Florencia Pansa, Renzo Emanuel Vera, Martín Ernesto Fernández-Zapico, Natalia Belén Rumie Vittar, Viviana Alicia Rivarola
Photodynamic therapy (PDT), a promising treatment option for cancer, involves the activation of a photosensitizer (PS) by local irradiation with visible light. Excitation of the PS leads to a series of photochemical reactions and consequently the local generation of harmful reactive oxygen species (ROS) causing limited or none systemic defects. However, the development of resistance to this promising therapy has slowed down its translation into the clinical practice. Thus, there is an increase need in understanding of the molecular mechanism underlying resistance to PDT...
2017: PloS One
https://www.readbyqxmd.com/read/28545086/cancer-cell-spheroids-are-a-better-screen-for-the-photodynamic-efficiency-of-glycosylated-photosensitizers
#6
Patrícia M R Pereira, Naxhije Berisha, N V S Dinesh K Bhupathiraju, Rosa Fernandes, João P C Tomé, Charles Michael Drain
Photodynamic Therapy (PDT) relies on the use of non-toxic photosensitizers that are locally and selectively activated by light to induce cell death or apoptosis through reactive oxygen species generation. The conjugation of porphyrinoids with sugars that target cancer is increasingly viewed as an effective way to increase the selectivity of PDT. To date, in vitro PDT efficacy is mostly screened using two-dimensional monolayer cultures. Compared to monolayer cultures, three-dimensional spheroid cultures have unique spatial distributions of nutrients, metabolites, oxygen and signalling molecules; therefore better mimic in vivo conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28544980/what-we-authors-reviewers-and-editors-of-scientific-work-can-learn-from-the-analytical-history-of-biological-3-nitrotyrosine
#7
REVIEW
Dimitrios Tsikas
Tyrosine and tyrosine residues in proteins are attacked by the reactive oxygen and nitrogen species peroxynitrite (O=N-OO(-)) to generate 3-nitrotyrosine (3-NT) and 3-nitrotyrosine-proteins (3-NTProt), respectively. 3-NT and 3-NTProt are widely accepted as biomarkers of nitr(os)ative stress. Over the years many different analytical methods have been reported for 3-NT and 3-NTProt. Reported concentrations often differ by more than three orders of magnitude, indicative of serious analytical problems. Strategies to overcome pre-analytical and analytical shortcomings and pitfalls have been proposed...
May 13, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28544901/alkaline-electrochemical-advanced-oxidation-process-for-chromium-oxidation-at-graphitized-multi-walled-carbon-nanotubes
#8
Yudong Xue, Shili Zheng, Zhi Sun, Yi Zhang, Wei Jin
Alkaline electrochemical advanced oxidation processes for chromium oxidation and Cr-contaminated waste disposal were reported in this study. The highly graphitized multi-walled carbon nanotubes g-MWCNTs modified electrode was prepared for the in-situ electrochemical generation of HO2(-). RRDE test results illustrated that g-MWCNTs exhibited much higher two-electron oxygen reduction activity than other nanocarbon materials with peak current density of 1.24 mA cm(-2), %HO2(-) of 77.0% and onset potential of -0...
May 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28544643/adaptations-to-endurance-training-depend-on-exercise-induced-oxidative-stress-exploiting-redox-inter-individual-variability
#9
Nikos V Margaritelis, Anastasios A Theodorou, Vassilis Paschalis, Aristidis S Veskoukis, Konstantina Dipla, Andreas Zafeiridis, George Panayiotou, Ioannis S Vrabas, Antonios Kyparos, Michalis G Nikolaidis
AIM: The aim of the present study was to reveal the role of reactive oxygen and nitrogen species (RONS) in exercise adaptations under physiological in vivo conditions and without the interference from other exogenous redox agents (e.g., a pro-oxidant or antioxidant). METHODS: We invented a novel methodological set-up that exploited the large redox inter-individual variability in exercise responses. More specifically, we used exercise-induced oxidative stress as the "classifier" measure (i...
May 24, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28544624/pyrimidine-containing-epidermal-growth-factor-receptor-kinase-inhibitors-synthesis-and-biological-evaluation
#10
Gaurav Joshi, Himanshu Nayyar, Sourav Kalra, Praveen Sharma, Anjana Munshi, Sandeep Singh, Raj Kumar
Structure based design and synthesis of pyrimidine containing reversible epidermal growth factor receptor (EGFR) inhibitors 1a-d are reported. The compounds (1a-d) inhibited the EGFR kinase activity in vitro with IC50 range 740 nM to 3 μM. mRNA expression of EGFR downstream target genes i.e. twist, c-fos and aurora were found to be altered upon treatment with compounds 1a-d. The compounds 1a-d exhibited excellent anticancer activity at low micromolar level (3.2-9 μM) in lung, colon and breast cancer cell lines...
May 23, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28544571/reactivity-of-copper-iii-oxo-complexes-in-the-gas-phase
#11
Ghazaleh Yassaghi, Erik Andris, Jana Roithová
We show an efficient way to generate [(L)CuO]+ complexes with a number of monodentate and bidentate ligands L from their [(L)Cu(ClO3)]+ precursors by electrospray ionization. Further, we studied [(L)CuO]+ with L = 9,10-phenanthraquinone, 1,10-phenanthroline and acetonitrile in detail. The signature of these terminal copper-oxo complexes is elimination of the oxygen atom upon collisional activation. We have investigated and compared their reactions with water, ethane, ethylene and 1,4-cyclohexadiene. The [(CH3CN)CuO]+ complex can oxidize water and perform C-H activation and hydroxylation of ethane...
May 22, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28544564/podocyte-activation-of-nlrp3-inflammasomes-contributes-to-the-development-of-proteinuria-in-lupus-nephritis
#12
Rong Fu, Chaohuan Guo, Shuang Wang, Yuefang Huang, Ou Jin, Haoqiang Hu, Jingxian Chen, Bihua Xu, Mianjing Zhou, Jijun Zhao, Sun-Sang J Sung, Hongyang Wang, Felicia Gaskin, Niansheng Yang, Shu-Man Fu
Objective Development of proteinuria in lupus nephritis (LN) is associated with podocyte dysfunction. The NLRP3 inflammasome has been implicated in the pathogenesis of LN. This study investigates whether NLRP3 inflammasome activation is involved in the development of podocyte injury in LN. Methods A fluorescence-labeled caspase-1 inhibitor probe was used to detect the activation of NLRP3 inflammasomes in podocytes in lupus-prone NZM2328 mice and in renal biopsies from LN patients. MCC950, a selective inhibitor of NLRP3, was used to treat NZM2328 mice...
May 23, 2017: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/28544543/acute-toll-like-receptor-4-activation-impairs-rat-renal-microvascular-autoregulatory-behaviour
#13
Justin P Van Beusecum, Shali Zhang, Anthony K Cook, Edward W Inscho
AIM: Little is known about how toll-like receptor 4 (TLR4) influences the renal microvasculature. We hypothesized that acute TLR4 stimulation with lipopolysaccharide (LPS) impairs afferent arteriole autoregulatory behaviour, partially through reactive oxygen species (ROS). METHODS: We assessed afferent arteriole autoregulatory behaviour after LPS treatment (1 mg kg(-1) ; i.p.) using the in vitro blood perfused juxtamedullary nephron preparation. Autoregulatory behaviour was assessed by measuring diameter responses to step-wise changes in renal perfusion pressure...
May 25, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28544340/a-high-valent-non-heme-%C3%AE-oxo-mniv-dimer-generated-from-a-thiolate-bound-mnii-complex-and-o2
#14
Carole Duboc, Deborah Brazzolotto, Fabián G Cantú Reinhard, Julian Smith-Jones, Marius Retegan, Lucia Amidani, Abayomi S Faponle, Kallol Ray, Christian Philouze, Sam P de Visser, Marcello Gennari
This study deals with the unprecedented reactivity of dinuclear non heme MnII-thiolate complexes with O2, which dependent on the protonation state of the initial MnII dimer selectively generates either a di-μ-oxo or μ-oxo-μ-hydroxo MnIV complex. Both dimers have been characterized by different techniques including single-crystal X-ray diffraction and mass spectrometry. Oxygenation reactions carried out with labeled 18O2 unambiguously shows that the oxygen atoms present in the MnIV dimers originate from O2...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543935/neurodegeneration-in-ataxia-telangiectasia-multiple-roles-of-atm-kinase-in-cellular-homeostasis
#15
REVIEW
Kay Rui Choy, Dianne J Watters
Ataxia-Telangiectasia (A-T) is characterized by neuronal degeneration, cancer, diabetes, immune deficiency and increased sensitivity to ionizing radiation. A-T is attributed to the deficiency of the protein kinase coded by the ATM (Ataxia-Telangiectasia Mutated) gene. ATM is a sensor of DNA Double Strand Breaks and signals to cell cycle checkpoints and the DNA repair machinery. ATM phosphorylates numerous substrates and activates many cell-signalling pathways. There has been considerable debate about whether a defective DNA damage response is causative of the neurological aspects of the disease...
May 22, 2017: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/28543808/comparison-of-two-methods-of-seminal-plasma-removal-on-buffalo-bubalus-bubalis-sperm-cryopreservation
#16
R S Albuquerque, R Morais, A N Reis, M S Miranda, Ear Dias, F M Monteiro, Ccp Paz, M Nichi, Gkv Kawai, Cpf Della'Aqua, F O Papa, R B Viana, L U Gimenes
Cryopreservation causes damage to spermatozoa, and methods minimizing this damage are therefore needed. Although much discussed, seminal plasma removal has become an alternative to improve sperm quality and viability after freezing and has been applied to different species in attempt to obtain good results. The objective of this study was to evaluate semen quality in buffaloes submitted to two methods for seminal plasma removal (filtration and centrifugation). Semen samples were collected from seven Murrah buffalo bulls (Bubalus bubalis) once a week for 8 weeks...
May 19, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28543759/abrus-agglutinin-promotes-irreparable-dna-damage-by-triggering-ros-generation-followed-by-atm-p73-mediated-apoptosis-in-oral-squamous-cell-carcinoma
#17
Niharika Sinha, Prashanta Kumar Panda, Prajna Paramita Naik, Durgesh Nandini Das, Subhadip Mukhopadhyay, Tapas K Maiti, Muthu K Shanmugam, Arunachalam Chinnathambi, M E Zayed, Sulaiman Ali Alharbi, Gautam Sethi, Rajesh Agarwal, Sujit K Bhutia
Oral cancer, a type of head and neck cancer, is ranked as one of the top most malignancies in India. Herein, we evaluated the anticancer efficacy of Abrus agglutinin (AGG), a plant lectin, in oral squamous cell carcinoma. AGG selectively inhibited cell growth, and caused cell cycle arrest and mitochondrial apoptosis through a reactive oxygen species (ROS)-mediated ATM-p73 dependent pathway in FaDu cells. AGG-induced ROS accumulation was identified as the major mechanism regulating apoptosis, DNA damage and DNA-damage response, which were significantly reversed by ROS scavenger N-acetylcysteine (NAC)...
May 23, 2017: Molecular Carcinogenesis
https://www.readbyqxmd.com/read/28543688/glycated-human-albumin-alters-mitochondrial-respiration-in-preadipocyte-3t3-l1-cells
#18
Pascal Baret, Fanny Le Sage, Cynthia Planesse, Olivier Meilhac, Anne Devin, Emmanuel Bourdon, Philippe Rondeau
Diabetes and obesity are strongly associated with increased levels of circulating advanced glycation end products (AGEs) and reactive oxygen species (ROS). These two molecular phenomena affect the physiology of adipose tissue, a biological driver of the metabolic syndrome, leading to an inflammatory profile and insulin resistance, which could contribute to obesity/diabetes-associated complications, such as cardiovascular diseases. Herein, we investigated the impact of AGEs on mitochondrial bioenergetics in murine preadipocyte cells (3T3-L1) and cellular redox homeostasis...
May 22, 2017: BioFactors
https://www.readbyqxmd.com/read/28543404/tumor-necrosis-factor-%C3%AE-induced-apoptosis-in-u937-cells-promotes-cathepsin-d-independent-stefin-b-degradation
#19
Katja Bidovec, Janja Božič, Iztok Dolenc, Boris Turk, Vito Turk, Veronika Stoka
Lysosomal cathepsins were previously found to be involved in tumor necrosis factor-α (TNFα)-induced apoptosis. However, there are opposing views regarding their role as either initiators or amplifiers of the signaling cascade as well as the order of molecular events during this process. In this study, we investigated the role of cathepsin D (catD) in TNFα/cycloheximide-induced apoptosis in U937 human monocytic cells. TNFα-induced apoptosis proceeds through caspase-8 activation, processing of the pro-apoptotic molecule Bid, mitochondrial membrane permeabilization, and caspase-3 activation...
May 20, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28543396/functional-and-structural-assessment-of-the-effect-of-human-umbilical-cord-blood-mesenchymal-stem-cells-in-doxorubicin-induced-cardiotoxicity
#20
Somia H Abd Allah, Samia Hussein, Mai M Hasan, Raghda H A Deraz, Wafaa F Hussein, Laila M E Sabik
Cardiomyopathy induced by doxorubicin (DOX) was recognized at an early stage and also several years after drug administration. Mesenchymal stem cells (MSCs) have many properties that make them suitable for preventive and/ or regenerative therapies. In this study, we evaluated the effect of MSCs in the functional and the structural improvement of DOX-induced cardiomyopathy in rats. Ninety adult male albino rats were randomly divided into three equal groups of thirty rats each: Group I (control): rats received normal saline...
May 25, 2017: Journal of Cellular Biochemistry
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