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https://www.readbyqxmd.com/read/28092839/effect-and-mechanism-of-sorbus-pohuashanensis-hante-hedl-flavonoids-protect-against-arsenic-trioxide-induced-cardiotoxicity
#1
Xiaojin Yu, Zhenyu Wang, Zunpeng Shu, Zhengqing Li, Yuan Ning, Keli Yun, Haina Bai, Ruihai Liu, Wenli Liu
The cardiotoxicity of arsenic trioxide (ATO) limits its clinical application in cancer treatment. Evidences suggest that sorbus has antioxidant activity and its consumption has been linked with improved cardioprotection. In this study, we investigated the cardio-protective effect and mechanisms of Sorbus pohuashanensis (Hante) Hedl. flavonoids (SPF) against ATO in BALB/c mice and H9c2 cells. Eleven major flavonoids were confirmed by ultra-performance liquid chromatography electrospray ionization quadrupole time of flight mass spectrometry (UPLC-ESI-Q-TOF-MS)...
January 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28071820/response-profiling-using-shotgun-proteomics-enables-global-metallodrug-mechanisms-of-action-to-be-established
#2
Dominique Kreutz, Andrea Bileck, Kerstin Plessl, Denise Wolrab, Michael Groessl, Bernhard K Keppler, Samuel M Meier, Christopher Gerner
Response profiling using shotgun proteomics for establishing global metallodrug mechanisms of action in two colon carcinoma cell lines, HCT116 and SW480, has been applied and evaluated with the clinically approved arsenic trioxide. Surprisingly, the complete established mechanism of action of arsenic trioxide was observed by protein regulations in SW480, but not HCT116 cells. Comparing the basal protein expression in the two cell lines revealed an 80 % convergence of protein identification, but with significant expression differences, which in turn seem to affect the extent of protein regulation...
November 7, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28069514/increased-microrna-21-expression-contributes-to-arsenic-induced-skin-lesions-skin-cancers-and-respiratory-distress-in-chronically-exposed-individuals
#3
Nilanjana Banerjee, Apurba K Bandyopadhyay, Suman Dutta, Jayanta K Das, Tarit Roy Chowdhury, Arun Bandyopadhyay, Ashok K Giri
More than 26 million people in West Bengal, India, are exposed to arsenic through drinking water, leading to several deleterious endpoints including precancerous and cancerous skin lesions and other non-dermatological health effects. Here, our aim was to identify whether miR21 is associated with such dermatological and non-dermatological health outcomes in chronically exposed humans. A total of 123 subjects from West Bengal were recruited for this study (45 exposed individuals with skin lesions, 38 exposed individuals without skin lesions and 40 unexposed individuals)...
January 6, 2017: Toxicology
https://www.readbyqxmd.com/read/28065543/mitigating-dietary-arsenic-exposure-current-status-in-the-united-states-and-recommendations-for-an-improved-path-forward
#4
Keeve E Nachman, Gary L Ginsberg, Mark D Miller, Carolyn J Murray, Anne E Nigra, Claire B Pendergrast
Inorganic arsenic (iAs) is a well-characterized carcinogen, and recent epidemiologic studies have linked chronic exposures to non-cancer health outcomes, including cardiovascular disease, diabetes, skin lesions and respiratory disorders. Greater vulnerability has been demonstrated with early life exposure for health effects including lung and bladder cancer, immunotoxicity and neurodevelopment. Despite its well-known toxicity, there are important gaps in the regulatory oversight of iAs in food and in risk communication...
January 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28061438/combination-of-arsenic-trioxide-and-everolimus-rad001-synergistically-induces-both-autophagy-and-apoptosis-in-prostate-cancer-cells
#5
Sheng Tai, Lingfan Xu, Ming Xu, Ligang Zhang, Yangyang Zhang, Kaipin Zhang, Li Zhang, Chaozhao Liang
The inhibitor of PI3K-AKT-mTOR pathway, such as Rad001, has not shown therapeutic efficacy as a single agent in prostate cancer. Arsenic trioxide induces the autophagic pathway in prostate cancer cells. We identified Arsenic trioxide can synergize with Rad001 to induce cytotoxicity of prostate cancer cells. Moreover, we identified synergistic induction of autophagy and apoptosis as the underlying mechanism. This enhanced autophagic cell death is accompanied by increased Beclin1 mRNA stability as well as upregulation of ATG5-ATG12 conjugate, Beclin1, and LC3-2...
January 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28040261/refinement-of-arsenic-attributable-health-risks-in-rural-pakistan-using-population-specific-dietary-intake-values
#6
Hifza Rasheed, Rebecca Slack, Paul Kay, Yun Yun Gong
BACKGROUND: Previous risk assessment studies have often utilised generic consumption or intake values when evaluating ingestion exposure pathways. If these values do not accurately reflect the country or scenario in question, the resulting risk assessment will not provide a meaningful representation of cancer risks in that particular country/scenario. OBJECTIVES: This study sought to determine water and food intake parameters for one region in South Asia, rural Pakistan, and assess the role population specific intake parameters play in cancer risk assessment...
December 28, 2016: Environment International
https://www.readbyqxmd.com/read/28035418/realgar-transforming-solution-displays-anticancer-potential-against-human-hepatocellular-carcinoma-hepg2-cells-by-inducing-ros
#7
Peng Song, Peng Chen, Dong Wang, Zhengrong Wu, Qiyu Gao, Aixia Wang, Ruilan Zhu, Yajun Wang, Xin Wang, Longhe Zhao, Ziyun Duan, Shuqian Zhu, Peng Cui, Yang Li, Hongyu Li
Realgar (As4S4), as a mineral drug containing arsenic compound, has been employed in clinical therapy of cancer for its good therapeutic reputation in Chinese traditional medicine. However, large dose of realgar and long period of treatment are necessary for achieving the effective blood medicine concentration due to its low bioavailability resulted from poor solubility. In this study, we obtained realgar transforming solution (RTS) using intrinsic biotransformation in microorganism, and investigated underlying mechanisms of RTS for HepG2 cells...
December 30, 2016: International Journal of Oncology
https://www.readbyqxmd.com/read/28025110/hypomethylation-of-inflammatory-genes-cox2-egr1-and-socs3-and-increased-urinary-8-nitroguanine-in-arsenic-exposed-newborns-and-children
#8
Preeyaphan Phookphan, Panida Navasumrit, Somchamai Waraprasit, Jeerawan Promvijit, Krittinee Chaisatra, Thitirat Ngaotepprutaram, Mathuros Ruchirawat
Early-life exposure to arsenic increases risk of developing a variety of non-malignant and malignant diseases. Arsenic-induced carcinogenesis may be mediated through epigenetic mechanisms and pathways leading to inflammation. Our previous study reported that prenatal arsenic exposure leads to increased mRNA expression of several genes related to inflammation, including COX2, EGR1, and SOCS3. This study aimed to investigate the effects of arsenic exposure on promoter DNA methylation and mRNA expression of these inflammatory genes (COX2, EGR1, and SOCS3), as well as the generation of 8-nitroguanine, which is a mutagenic DNA lesion involved in inflammation-related carcinogenesis...
December 23, 2016: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28013460/arsenic-trioxide-induces-ros-activity-and-dna-damage-leading-to-g0-g1-extension-in-skin-fibroblasts-through-the-atm-atr-associated-chk-pathway
#9
Jutapon Chayapong, Harishkumar Madhyastha, Radha Madhyastha, Queen Intan Nurrahmah, Yuichi Nakajima, Narantsog Choijookhuu, Yoshitaka Hishikawa, Masugi Maruyama
Arsenic (As) toxicity is a global health problem, affecting millions of people. Exposure to arsenic, mostly via drinking water, has been associated with cancer of skin, lungs, and blood, in addition to several kinds of skin lesions. The present study focused on the effect of arsenic trioxide (As2O3) on normal skin fibroblast cells. Specifically, the effect of As2O3 on ROS generation and oxidative stress was investigated. Proteins involved in the DNA damage signaling pathway and cell cycle were also studied...
December 24, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28007985/dose-response-relationship-between-inorganic-arsenic-exposure-and-lung-cancer-among-arseniasis-residents-with-low-methylation-capacity
#10
Kuang-Hung Hsu, Ke-Hung Tsui, Ling-I Hsu, Hung-Yi Chiou, Chien-Jen Chen
Background Exposure to inorganic arsenic (InAs) has been documented as a risk factor for lung cancer. This study examined the association between InAs exposure, its metabolism, and lung cancer occurrence. Methods We followed 1300 residents from an arseniasis area in Taiwan, determined urinary InAs metabolites, and identified 39 lung cancer cases. Cox proportional hazard model was performed. Results The results demonstrated that participants with either the primary methylation index (monomethylarsonic acid [MMA]/InAs) or the secondary methylation index (dimethylarsinic acid[DMA]/MMA) lower than their respective median values were at a higher risk of lung cancer (hazard ratios from 3...
December 22, 2016: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28007180/thiolated-arsenicals-in-arsenic-metabolism-occurrence-formation-and-biological-implications
#11
REVIEW
Yuzhen Sun, Guangliang Liu, Yong Cai
Arsenic (As) is a notoriously toxic pollutant of health concern worldwide with potential risk of cancer induction, but meanwhile it is used as medicines for the treatment of different conditions including hematological cancers. Arsenic can undergo extensive metabolism in biological systems, and both toxicological and therapeutic effects of arsenic compounds are closely related to their metabolism. Recent studies have identified methylated thioarsenicals as a new class of arsenic metabolites in biological systems after exposure of inorganic and organic arsenicals, including arsenite, dimethylarsinic acid (DMA(V)), dimethylarsinous glutathione (DMA(III)GS), and arsenosugars...
November 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28007178/inorganic-arsenic-a-non-genotoxic-carcinogen
#12
REVIEW
Samuel M Cohen, Aparajita Chowdhury, Lora L Arnold
Inorganic arsenic induces a variety of toxicities including cancer. The mode of action for cancer and non-cancer effects involves the metabolic generation of trivalent arsenicals and their reaction with sulfhydryl groups within critical proteins in various cell types which leads to the biological response. In epithelial cells, the response is cell death with consequent regenerative proliferation. If this continues for a long period of time, it can result in an increased risk of cancer. Arsenicals do not react with DNA...
November 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28007167/examination-of-in-vivo-mutagenicity-of-sodium-arsenite-and-dimethylarsinic-acid-in-gpt-delta-rats
#13
Masaki Fujioka, Min Gi, Satoko Kawachi, Kumiko Tatsumi, Naomi Ishii, Kenichiro Doi, Anna Kakehashi, Hideki Wanibuchi
Arsenic is a well-known human bladder and liver carcinogen, but its exact mechanism of carcinogenicity is not fully understood. Dimethylarsinic acid (DMA(V)) is a major urinary metabolite of sodium arsenite (iAs(III)) and induces urinary bladder cancers in rats. DMA(V) and iAs(III) are negative in in vitro mutagenicity tests. However, their in vivo mutagenicities have not been determined. The purpose of present study is to evaluate the in vivo mutagenicities of DMA(V) and iAs(III) in rat urinary bladder epithelium and liver using gpt delta F344 rats...
November 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28005215/arsenic-a-review-on-exposure-pathways-accumulation-mobility-and-transmission-into-the-human-food-chain
#14
REVIEW
Beste Arslan, Mustafa B A Djamgoz, Ertan Akün
This review deals with exposure pathways of arsenic (As), as well as its transfer and uptake processes from its source to the human body. It is proven fact that uptake of inorganic As for a long period can lead to chronic As poisoning and a variety of adverse health effects such as skin, lung and bladder cancer, in addition to cardiovascular diseases, diabetes and gastrointestinal symptoms. As exposure occurs primarily from consumption of potable water containing high amounts of inorganic As and also from consumption of crops cultivated in As contaminated agricultural fields-either naturally or anthropogenically through contaminated air or pesticides-or irrigated with As containing water...
December 23, 2016: Reviews of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28003426/pdk4-deficiency-results-in-expedited-cellular-proliferation-through-e2f1-mediated-increase-of-cyclins
#15
Jonathan P Choiniere, Jianguo Wu, Li Wang
Hepatocellular carcinoma (HCC) is a common form of cancer with prevalence worldwide. There are many factors that lead to the development and progression of HCC. The aim of this study was to identify potential new tumor suppressors and examine their function as cell cycle modulators and investigate their impact on the cyclin family of proteins and cyclin dependent kinases. In this study the pyruvate dehydrogenase kinase 4 (PDK4) gene was shown to have potential tumor suppressor characteristics. PDK4 expression was significantly downregulated in human HCC...
December 21, 2016: Molecular Pharmacology
https://www.readbyqxmd.com/read/28000977/silac-based-quantitative-proteomic-analysis-reveals-widespread-molecular-alterations-in-human-skin-keratinocytes-upon-chronic-arsenic-exposure
#16
Sartaj Ahmad Mir, Sneha M Pinto, Somnath Paul, Remya Raja, Vishalakshi Nanjappa, Nazia Syed, Jayshree Advani, Santosh Renuse, Nandini A Sahasrabuddhe, T S Keshava Prasad, Ashok K Giri, Harsha Gowda, Aditi Chatterjee
Chronic exposure to arsenic is associated with dermatological and nondermatological disorders. Consumption of arsenic-contaminated drinking water results in accumulation of arsenic in liver, spleen, kidneys, lungs, and gastrointestinal tract. Although arsenic is cleared from these sites, a substantial amount of residual arsenic is left in keratin-rich tissues including skin. Epidemiological studies suggest the association of skin cancer upon arsenic exposure, however, the mechanism of arsenic-induced carcinogenesis is not completely understood...
October 19, 2016: Proteomics
https://www.readbyqxmd.com/read/27992737/characterization-and-risk-of-exposure-to-elements-from-artisanal-gold-mining-operations-in-the-bolivian-andes
#17
Brian Pavilonis, Jean Grassman, Glen Johnson, Yilmael Diaz, Jack Caravanos
Artisanal and small-scale gold mining (ASGM) offers low-skilled workers an opportunity to elevate themselves out of poverty. However, this industry operates with little to no pollution controls and the cost to the environment and human health can be large. The objectives of this study were to measure levels of arsenic (As), manganese (Mn), cobalt (Co), lead (Pb), and mercury (Hg) in the environment and characterize health risks to miners and residents in an area with active ASGM operations. An exposure assessment was conducted at two different mining sites and a nearby village in the Bolivian Anders...
December 16, 2016: Environmental Research
https://www.readbyqxmd.com/read/27987742/preparation-properties-and-anticancer-effects-of-mixed-as4s4-zns-nanoparticles-capped-by-poloxamer-407
#18
Z Bujňáková, M Baláž, M Zdurienčíková, J Sedlák, M Čaplovičová, Ľ Čaplovič, E Dutková, A Zorkovská, E Turianicová, P Baláž, O Shpotyuk, S Andrejko
Arsenic sulfide compounds have a long history of application in a traditional medicine. In recent years, realgar has been studied as a promising drug in cancer treatment. In this study, the arsenic sulfide (As4S4) nanoparticles combined with zinc sulfide (ZnS) ones in different molar ratio have been prepared by a simple mechanochemical route in a planetary mill. The successful synthesis and structural properties were confirmed and followed via X-ray diffraction and high-resolution transmission electron microscopy measurements...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27966695/the-role-of-arsenic-in-the-hydrolysis-and-dna-metalation-processes-in-an-arsenous-acid-platinum-ii-anticancer-complex
#19
T Marino, A Parise, N Russo
Platinum(ii)-based molecules are the most commonly used anticancer drugs in the chemotherapeutic treatment of tumours but possess serious side effects and some cancer types exhibit resistance with respect to these compounds (e.g. cisplatin). For these reasons, the research of new compounds that can bypass this limitation is in continuous development. Recently, mixed Pt(ii)-As(iii) systems have been synthesized and tested as potential anticancer agents. The mechanism of action of these kinds of drugs is unclear...
January 4, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27940255/arsenic-trioxide-is-an-immune-adjuvant-in-liver-cancer-treatment
#20
Lei Wang, Ren Wang, Lin Fan, Wentao Liang, Kai Liang, Yingxin Xu, Guizhu Peng, Qifa Ye
Tumor cells are inhibited effectively by As2O3in vitro and in vivo, although the underlying immune regulatory mechanisms remain unknown. Regulatory T cells play a key role in tumor immune escape. In the present study, we aimed to assess the in vivo effects of As2O3 on the immune status in hepatic cancer and its in vitro regulatory role in cytokine-induced killers(CIKs)cytotoxicity. In a tumor H22 xenograft model of hepatic cancer, we demonstrated that As2O3 treatment decreased tumor volumes and weights, and improved survival by reducing Tregs infiltration into the tumor...
January 2017: Molecular Immunology
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