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As2O3

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https://www.readbyqxmd.com/read/29774349/role-of-arsenic-3-oxidation-state-methyltransferase-in-arsenic-mediated-apl-treatment-an-in-vitro-investigation
#1
Yasen Maimaitiyiming, Chao Wang, Shi Xu, Khairul Islam, Ye Jia Chen, Chang Yang, Qian Qian Wang, Hua Naranmandura
Arsenic (+3 oxidation state) methyltransferase (AS3MT) is a key enzyme responsible for arsenic metabolism in humans, which facilitates conversion of arsenic trioxide (As2O3) to more reactive metabolites such as monomethylarsonous acid (MMAIII) and dimethylarsinous acid (DMAIII). However, it is unclear whether the biotransformation of arsenic by AS3MT contributes to the promotion of acute promyelocytic leukemia (APL) therapy. In order to understand the probable role of AS3MT in APL patients, we evaluated the effects of arsenite (iAsIII) and three mixed arsenicals (i...
May 18, 2018: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29762750/the-apoptosis-in-arsenic-induced-oxidative-stress-is-associated-with-autophagy-in-the-testis-tissues-of-chicken
#2
Y Z Shao, H J Zhao, Y Wang, J J Liu, J L Li, L Y Luo, M W Xing
The aim of this study is to investigate whether arsenic (As) could induce testicular poisoning and influence the oxidative stress, apoptosis and autophagy in chickens. Seventy-two 1-day-old male Hy-line chickens were divided into 4 groups which were exposed to 0, 0.625, 1.25, and 2.5 mg/kg body weight (BW) of arsenic trioxide (As2O3) for 30, 60 and 90 days, respectively. Histological and ultrastructural changes, antioxidant enzyme activity, mRNA and protein levels of apoptosis and autophagy-related genes were detected...
May 14, 2018: Poultry Science
https://www.readbyqxmd.com/read/29718867/arsenic-trioxide-combined-with-transarterial-chemoembolization-for-unresectable-primary-hepatic-carcinoma-a-systematic-review-and-meta-analysis
#3
Peng Song, Yang Hai, Wantong Ma, Longhe Zhao, Xin Wang, Qinjian Xie, Yang Li, Zhengrong Wu, Yingdong Li, Hongyu Li
BACKGROUND: Primary hepatic carcinoma (PHC) is the third commonest leading to cancer death around the world, and transarterial chemoembolization (TACE) has been proposed as the first-line therapeutic treatment for patients with unresectable PHC. This study aims to determine whether the combination of As2O3 and TACE is superior to alone TACE for achieving more clinical therapeutic efficacy, survival time, life quality and safety in patients with unresectable PHC. METHODS: A comprehensive literature search was conducted on the clinical controlled trials comparing therapeutic effects of As2O3 & TACE versus alone TACE for unresectable PHC through English databases (including PubMed, Embase, and the Cochrane Library) and Chinese databases (including China Knowledge Resource Integrated Database, Wanfang Database, Weipu Database, and Chinese Biomedical Database)...
May 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29684096/toxic-effects-of-arsenic-trioxide-on-echinococcus-granulosus-protoscoleces-through-ros-production-and-ca2-er-stress-dependent-apoptosis
#4
Jiajie Li, Guangyao Tang, Wenjuan Qin, Rentan Yang, Rongji Ma, Bin Ma, Jianfeng Wei, Hailong Lv, Yufeng Jiang
Cystic echinococcosis is a severe parasitic disease that commonly affects the liver and causes abscesses or rupture into the surrounding tissues, leading to multiple complications, such as shock, severe abdominal pain, and post-treatment abscess recurrence. Currently, there are no efficient measures to prevent these complications. We previously confirmed that arsenic trioxide (As2O3) exhibited in vitro cytotoxicity against Echinococcus granulosus protoscoleces. In the present study, we aimed to explore the mechanism of As2O3-induced E...
April 19, 2018: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/29670967/investigation-of-hsa-as-a-biocompatible-coating-material-for-arsenic-trioxide-nanoparticles
#5
Maneka Hoonjan, Geetanjali Sachdeva, Sudeshna Chandra, Prashant S Kharkar, Niteshkumar Sahu, Purvi Bhatt
The anticancer properties of arsenic trioxide (As2O3) are accompanied by highly cytotoxic effects on normal cells. This necessitates developing modalities towards the targeted delivery of As2O3. Albumins, on account of their large structure and presence of several interacting groups, are ideal for encapsulating or carrying various drugs. In the present study, human serum albumin (HSA) was chosen as a coating agent to increase the biocompatibility of As2O3. An in situ chemical precipitation method was adopted for the synthesis of HSA-coated As2O3 nanoparticles (HSA-As2O3NPs) that were further characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, inductively coupled plasma atomic emission spectrometry (ICP-AES), zeta potential and transmission electron microscopy (TEM)...
April 19, 2018: Nanoscale
https://www.readbyqxmd.com/read/29297235/l-ascorbic-acid-and-%C3%AE-tocopherol-attenuate-arsenic-trioxide-induced-toxicity-in-h9c2-cardiomyocytes-by-the-activation-of-nrf2-and-bcl2-transcription-factors
#6
Radhakrishnan Chandraprabha Vineetha, Prakash Binu, Pettamanna Arathi, Raveendran Harikumaran Nair
Arsenic trioxide (As2 O3 ) is a potent drug for the treatment of acute promyelocytic leukemia (APL) and has achieved remarkable remissions in patients. Unfortunately, clinical reports have shown that the treatment is associated with cardiotoxicity. Many efforts have been made to mitigate drug-mediated cardiac damage using naturally occurring antioxidant compounds possessing free radical scavenging activity. The present investigation aims to explore protective role of L-ascorbic acid (L-AA) and α-tocopherol (α-TOC) from As2 O3 -induced oxidative stress in H9c2 cardiomyocytes through the evaluation of Nrf2 (nuclear factor erythroid 2-related factor 2) and Bcl-2 (B-cell lymphoma 2) transcription factors...
June 2018: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/29288301/arsenic-and-or-copper-caused-inflammatory-response-via-activation-of-inducible-nitric-oxide-synthase-pathway-and-triggered-heat-shock-protein-responses-in-testis-tissues-of-chicken
#7
Yizhi Shao, Hongjing Zhao, Yu Wang, Juanjuan Liu, Jinglun Li, Hongliang Chai, Mingwei Xing
The aim of this study is to investigate the effects of arsenic (As) and copper (Cu) on the inflammatory response, and the protective roles of heat shock proteins (Hsps) in chicken testes. Seventy-two 1-day-old male Hy-line chickens were treated with 30 mg/kg feed of arsenic trioxide (As2 O3 ) and/or 300 mg/kg feed of copper sulfate (CuSO4 ) for 4, 8, and 12 weeks. The histological changes, inducible nitric oxide synthase (iNOS) activity, and the expressions of Hsps and inflammatory cytokines were detected...
March 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29276995/characterization-and-ph-dependent-environmental-stability-of-arsenic-trioxide-containing-copper-smelter-flue-dust
#8
Alice Jarošíková, Vojtěch Ettler, Martin Mihaljevič, Petr Drahota, Adam Culka, Martin Racek
Increasing amounts of impurities (especially As) in Cu ores have aggravated the problem of flue dust generation in recent years. As an example from a smelter processing As-rich Cu ores, we characterized a flue dust particularly rich in As (>50 wt%) to understand its mineralogy and pH-dependent leaching behavior, with special emphasis on binding, release and solubility controls of inorganic contaminants (As, Bi, Cd, Cu, Pb, Sb, Zn). Whereas arsenolite (As2 O3 ) was the major host for As and Sb, other contaminants were bound in sulfides, arsenates, alloys and slag-like particles...
March 1, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29274627/regulation-of-abcg2-by-nuclear-factor-kappa-b-affects-the-sensitivity-of-human-lung-adenocarcinoma-a549-cells-to-arsenic-trioxide
#9
Xuejun Jiang, Chengzhi Chen, Shiyan Gu, Zunzhen Zhang
Arsenic trioxide (As2 O3 ) is successfully used as an anticancer agent against acute promyelocytic leukemia and some solid tumors. However, the application of As2 O3 is largely limited by its drug resistance in the treatment of non-small cell lung carcinoma (NSCLC). Therefore, it is an urgent task to enhance the sensitivity of lung cancer cells to As2 O3 . In this study, using human lung adenocarcinoma A549 cells as a cell culture model, we demonstrated that an adenosine triphosphate binding cassette (ABC) transporter, ABCG2, was significantly increased by As2 O3 treatment, while other ABC transporters, ABCB1 and ABCC1 showed no remarkable change in the response to As2 O3 ...
January 2018: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/29208170/ferula-gummosa-gum-induces-apoptosis-via-ros-mechanism-in-human-leukemic-cells
#10
Maliheh Moradzadeh, Hamid Reza Sadeghnia, Seyed Hadi Mousavi, Merat Mahmoodi, Azar Hosseini
Ferula species known for its oleo-resins that are recognized valuable industrial crops and food products. In this study, we examined the level of cellular oxidants, cytotoxicity, apoptosis and differentiation induced by oleo resin gum from Ferula gummosa (30-250 µg/mL), as well as Arsenic trioxide (50 µM, as positive control), in leukemic (NB4 and HL-60 cells) and normal polymorph nuclear cells during 72 h. Resazurin assay was used to determine cell viability following treatment with F. gummosa (30-250 µg/mL)...
November 30, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/29207612/the-antitumor-effect-of-arsenic-trioxide-on-hepatocellular-carcinoma-is-enhanced-by-andrographolide
#11
Xuhua Duan, Tengfei Li, Xinwei Han, Jianzhuang Ren, Pengfei Chen, Hao Li, Shaojun Gong
High concentrations of arsenic trioxide (As2 O3 ) are used to treat acute promyelocytic leukemia and solid tumors, with negative side effects to normal cells. Andrographolide is a traditional Chinese medicine that exerts anti-cancer, anti-inflammatory, anti-virus, and anti-diabetic effects. Here, we tested the effects of combined andrographolide with As2 O3 against hepatocellular carcinoma (HCC). We found that by increasing apoptosis, andrographolide synergistically enhanced the anti-tumor effects of As2O3 in HepG2 cells in vitro and in vivo ...
October 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/29164574/mechanism-of-as2o3-induces-apoptosis-of-glioma-u87-cells
#12
G-B Wang, J-H Liu, J Hu, K Xue
OBJECTIVE: To investigate the mechanism of arsenic trioxide (As2O3)-induced apoptosis of glioma cells. MATERIALS AND METHODS: U87 cells were treated by different concentrations of As2O3 (8 μmol/L, 6 μmol/L, 4 μmol/L, 2 μmol/L, 1 μmol/L and 0.5 μmol/L) for 24 h, 48 h and 72 h, respectively. Cell viability was detected by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, and the appropriate dosage and time were screened. Transferase-mediated deoxyuridine triphosphate-biotin nick end labeling (TUNEL) was used to stain cells, followed by an investigation on the apoptosis of cells...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29159556/effects-of-arsenic-trioxide-on-inf-gamma-gene-expression-in-mrl-lpr-mice-and-human-lupus
#13
Hongye Hu, Enjiu Chen, Yongji Li, Xiaochun Zhu, Ting Zhang, Xiaofang Zhu
Arsenic trioxide (As2O3; ATO), a traditional Chinese medicine, is used to treat patients with acute promye-locytic leukemia, while its application for treatment of systemic lupus erythematosus (SLE) is still under evaluation. The high expression of INF-gamma (INF-γ) is a primary pathogenic factor in SLE. It is found that ATO can reduce INF-γ expression levels in lupus-prone mice, whereas it is not clear whether ATO has the same effect on SLE patients. Therefore, this study was to investigate the underlying mechanism of the effects of ATO on the expression of INF-γ in splenocytes of MRL/lpr mice and PBMCs of human lupus...
November 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/29153291/structural-perturbation-by-arsenic-triggers-the-aggregation-of-hen-egg-white-lysozyme-by-promoting-oligomers-formation
#14
Neelakant Varma, Inderbhan Singh, Mohinder Singh Dahiya, Vijay Kumar Ravi, Satish Kumar
Arsenic trioxide is one of the most common metallic pollutants entering the food chain both by human activities and nature. Its entry inside the living organism through food, air and water results into the accumulation of heavy metal in several tissues which manifest several metabolic or hormonal disorders. Till now the effect of arsenic trioxide on protein misfolding and aggregation culminating into several neurodegenerative disorders is poorly understood. In the present study, we reveal the aggregation process of Hen Egg White Lysozyme (HEWL) in presence of arsenic trioxide (As2 O3 ) at physiological conditions...
April 1, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29138840/low-dosage-of-arsenic-trioxide-inhibits-vasculogenic-mimicry-in-hepatoblastoma-without-cell-apoptosis
#15
Feng Zhang, Chun-Mei Zhang, Shu Li, Kun-Kun Wang, Bin-Bin Guo, Yao Fu, Lu-Yang Liu, Yu Zhang, Hai-Yu Jiang, Chang-Jun Wu
Hepatoblastoma (HB) is the most common type of pediatric liver malignancy, which predominantly occurs in young children (aged <5 years), and continues to be a therapeutic challenge in terms of metastasis and drug resistance. As a new pattern of tumor blood supply, vasculogenic mimicry (VM) is a channel structure lined by tumor cells rather than endothelial cells, which contribute to angiogenesis. VM occurs in a variety of solid tumor types, including liver cancer, such as hepatocellular carcinoma. The aim of the present study was to elucidate the effect of arsenic trioxide (As2O3) on VM...
January 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29111283/pancreatic-islet-autonomous-effect-of-arsenic-on-insulin-secretion-through-endoplasmic-reticulum-stress-autophagy-pathway
#16
Wei Wu, Xiaofeng Yao, Liping Jiang, Qiaoting Zhang, Jie Bai, Tianming Qiu, Lei Yang, Ni Gao, Guang Yang, Xiaofang Liu, Min Chen, Xiance Sun
Inorganic arsenic is a worldwide environmental pollutant. Arsenic's relationship with the incidence of diabetes arouses concerns on its etiological mechanism. In this study, the glucose-stimulated insulin secretion (GSIS) from isolated pancreatic islets of As2 O3 -treated mice was significantly lower than that of control mice. It indicated that the effect of As2 O3 -inhibited GSIS was pancreatic islet-autonomous. The level of phospho-PERK (p-PERK), a biomarker of endoplasmic reticulum (ER) stress, in pancreas of As2 O3 -treated mice was increased significantly...
January 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29111252/organic-matter-control-on-the-distribution-of-arsenic-in-lake-sediments-impacted-by-65years-of-gold-ore-processing-in-subarctic-canada
#17
Jennifer M Galloway, Graeme T Swindles, Heather E Jamieson, Michael Palmer, Michael B Parsons, Hamed Sanei, Andrew L Macumber, R Timothy Patterson, Hendrik Falck
Climate change is profoundly affecting seasonality, biological productivity, and hydrology in high northern latitudes. In sensitive subarctic environments exploitation of mineral resources led to contamination and it is not known how cumulative effects of resource extraction and climate warming will impact ecosystems. Gold mines near Yellowknife, Northwest Territories, subarctic Canada, operated from 1938 to 2004 and released >20,000t of arsenic trioxide (As2 O3 ) to the environment through stack emissions...
May 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29054015/synergistic-effect-of-copper-and-arsenic-upon-oxidative-stress-inflammation-and-autophagy-alterations-in-brain-tissues-of-gallus-gallus
#18
Xiao Sun, Jinglun Li, Hongjing Zhao, Yu Wang, Juanjuan Liu, Yizhi Shao, Yuan Xue, Mingwei Xing
Arsenic or copper is one of the most highly toxic pollution that can cause dysfunction to brains, however, the exact mechanism remains unclear. The aim of the study is to investigate the mechanisms of arsenic or/and copper-induced oxidative stress, inflammation and autophagy in chicken brains and elucidate the interactions between arsenic and copper. A total of 72 1-day-old Hy-line chickens were divided into four groups (18 chickens per group) treated with 30mg/kg arsenic trioxide (As2O3) or/and 300mg/kg copper sulfate (CuSO4) for 12weeks...
October 12, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28978146/eriodictyol-attenuates-arsenic-trioxide-induced-liver-injury-by-activation-of-nrf2
#19
Guanghong Xie, Xiaolin Meng, Fei Wang, Yuxin Bao, Junyuan Huo
Arsenic, a well-known human carcinogen, has been reported to induce hepatic oxidative stress and hepatic injury. Eriodictyol, a flavonoid found in citrus fruits, has been reported to have antioxidant effects. In this study, we aimed to investigate the protective effects of eriodictyol on arsenic trioxide (As2O3)-induced liver injury and to clarify the molecular mechanism. Male Wistar rats were administrated 3mg/kg As2O3 intravenous injection at days 1, 4, 5, and 7. Eriodictyol was given 1 h before or after As2O3 treatment...
September 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28956730/inactivation-of-mir-100-combined-with-arsenic-treatment-enhances-the-malignant-transformation-of-beas-2b-cells-via-stimulating-epithelial-mesenchymal-transition
#20
Jia Yang, Zhijun Chen, Xinyi Wang, Mo Xu, Haoshu Fang, Feifei Li, Yakun Liu, Yu Jiang, Yi Ding, Juan Li, Siying Wang
Chronic arsenic treatment induces epithelial-mesenchymal transition (EMT) and promotes tumorigenicity, but the mechanism is unclear. MiR-100 has been shown to be involved in this biologic process. In this study, we hypothesize that inactivation of miR-100 combined with low concentration of arsenic exposure could promote the malignant transformation of human bronchial epithelial cells (BEAS-2B cell) by promoting EMT. To test this hypothesis, BEAS-2B cells were treated with low-dose of As2 O3 chronically, and lentiviral vectors were used to mediate the inhibition of miR-100 expression...
December 2, 2017: Cancer Biology & Therapy
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