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https://www.readbyqxmd.com/read/28623268/ascorbate-induces-apoptosis-in-melanoma-cells-by-suppressing-clusterin-expression
#1
Sushmita Mustafi, David W Sant, Zhao-Jun Liu, Gaofeng Wang
Pharmacological levels of ascorbate have long been suggested as a potential treatment of cancer. However, we observed that EC50 of ascorbate was at a similar level for cultured healthy melanocytes and melanoma cells, suggesting a limit of pharmacological ascorbate in treating cancer. Loss of 5-hydroxymethylcytosine (5 hmC) is an epigenetic hallmark of cancer and ascorbate promotes 5 hmC generation by serving as a cofactor for TET methylcytosine dioxygenases. Our previous work demonstrated that ascorbate treatment at physiological level (100 μM) increased 5 hmC content in melanoma cells toward the level of healthy melanocytes...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28609715/an-ultrasensitive-photoelectrochemical-immunosensor-for-insulin-detection-based-on-biobr-ag2s-composite-by-in-situ-growth-method-with-high-visible-light-activity
#2
Dawei Fan, Haoyuan Wang, Malik Saddam Khan, Chunzhu Bao, Huan Wang, Dan Wu, Qin Wei, Bin Du
A novel ultrasensitive label-free immunosensor based on BiOBr/Ag2S composite with high visible-light photoelectrochemical activity was prepared for the detection of insulin. After BiOBr was modified by thioglycolic acid, Ag2S nanoparticles were grown in-situ on the surface of BiOBr hierarchical microspheres to first form novel BiOBr/Ag2S composite. When ascorbic acid (AA) was used as an efficient electron donor for scavenging photo-generated holes, BiOBr/Ag2S composite material showed excellent photoelectrochemical activity...
June 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28587101/therapeutic-applications-of-rose-hips-from-different-rosa-species
#3
REVIEW
Inés Mármol, Cristina Sánchez-de-Diego, Nerea Jiménez-Moreno, Carmen Ancín-Azpilicueta, María Jesús Rodríguez-Yoldi
Rosa species, rose hips, are widespread wild plants that have been traditionally used as medicinal compounds for the treatment of a wide variety of diseases. The therapeutic potential of these plants is based on its antioxidant effects caused by or associated with its phytochemical composition, which includes ascorbic acid, phenolic compounds and healthy fatty acids among others. Over the last few years, medicinal interest in rose hips has increased as a consequence of recent research that has studied its potential application as a treatment for several diseases including skin disorders, hepatotoxicity, renal disturbances, diarrhoea, inflammatory disorders, arthritis, diabetes, hyperlipidaemia, obesity and cancer...
May 25, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28578952/chitosan-nanoparticles-from-marine-squid-protect-liver-cells-against-n-diethylnitrosoamine-induced-hepatocellular-carcinoma
#4
Namasivayam Subhapradha, Vairamani Shanmugam, Annaian Shanmugam
Rationale of this study was framed to investigate the protective effect and anti-cancer property of nanoparticles based on chitosan isolated from squid, Sepioteuthis lessoniana, on hepatic cells in N-Nitrosodiethylamine-induced hepatocellular carcinoma in rats. The results conferred that the chitosan nanoparticle supplementation had a protective effect on liver cells by reducing the levels of marker enzymes and bilirubin and thus increasing the albumin levels. The level of reduced glutathione, ascorbic acid and α-tocopherol significantly increased in both post- and pre-treatment with chitosan nanoparticles...
September 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28544013/-epigallocatechin-3-gallate-inhibits-human-angiotensin-converting-enzyme-activity-through-an-autoxidation-dependent-mechanism
#5
Zhe Liu, Sayaka Nakashima, Toshiyuki Nakamura, Shintaro Munemasa, Yoshiyuki Murata, Yoshimasa Nakamura
We investigated the molecular mechanisms involved in the angiotensin-converting enzyme (ACE) inhibition by (-)-epigallocatechin-3-gallate (EGCg), a major tea catechin. EGCg inhibited both the ACE activity in the lysate of human colorectal cancer cells and human recombinant ACE (rh-ACE) in a dose-dependent manner. Co-incubation with zinc sulfate showed no influence on the rh-ACE inhibition by EGCg, whereas it completely counteracted the inhibitory effect of ethylenediaminetetraacetic acid, a chelating-type ACE inhibitor...
May 23, 2017: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/28533502/clinical-value-and-prospective-pathway-signaling-of-microrna-375-in-lung-adenocarcinoma-a-study-based-on-the-cancer-genome-atlas-tcga-gene-expression-omnibus-geo-and-bioinformatics-analysis
#6
Ting-Qing Gan, Wen-Jie Chen, Hui Qin, Su-Ning Huang, Li-Hua Yang, Ye-Ying Fang, Lin-Jiang Pan, Zu-Yun Li, Gang Chen
BACKGROUND Lung adenocarcinoma (LUAD) is the most frequent lung cancer. MicroRNAs (miRNAs) are believed to have fundamental roles in tumorigenesis of LUAD. Although miRNAs are broadly recognized in LUAD, the role of microRNA-375 in LUAD is still not fully elucidated. MATERIAL AND METHODS We evaluated the significance of miR-375 expression in LUAD by using analysis of a public dataset from the Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) database and a literature review. Furthermore, we investigated the biological function of miR-375 by gene ontology enrichment and target prediction analysis...
May 23, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28526602/palmitoyl-ascorbate-and-doxorubicin-co-encapsulated-liposome-for-synergistic-anticancer-therapy
#7
Yue Yang, Xiaoyu Lu, Qi Liu, Yu Dai, Xiaojie Zhu, Yanli Wen, Jiaqiu Xu, Yang Lu, Di Zhao, Xijing Chen, Ning Li
Combination therapy with two drugs and nanoparticle-based drug delivery systems are widely applied to reduce the adverse effects of traditional treatment by chemotherapeutic drugs. Palmitoyl ascorbate (PA) as a lipophilic derivative of ascorbic acid shows the advantages in cancer treatment. The aim of the study was to prepare a doxorubicin (DOX) and PA co-loaded liposome to synergistically treat tumor and effectively alleviate the toxicity caused by DOX. The effects were evaluated by in vitro and in vivo studies...
May 17, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28491239/opuntia-spp-characterization-and-benefits-in-chronic-diseases
#8
REVIEW
María Del Socorro Santos Díaz, Ana-Paulina Barba de la Rosa, Cécile Héliès-Toussaint, Françoise Guéraud, Anne Nègre-Salvayre
Opuntia species have been used for centuries as food resources and in traditional folk medicine for their nutritional properties and their benefit in chronic diseases, particularly diabetes, obesity, cardiovascular diseases, and cancer. These plants are largely distributed in America, Africa, and the Mediterranean basin. Opuntia spp. have great economic potential because they grow in arid and desert areas, and O. ficus-indica, the domesticated O. species, is used as a nutritional and pharmaceutical agent in various dietary and value-added products...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28484682/vitamin-c-transporters-in-cancer-current-understanding-and-gaps-in-knowledge
#9
REVIEW
Christina Wohlrab, Elisabeth Phillips, Gabi U Dachs
Sufficient uptake and whole body distribution of vitamin C (ascorbate) is essential for many biochemical processes, including some that are vital for tumor growth and spread. Uptake of ascorbate into cancer cells is modulated by availability, tumor blood flow, tissue diffusion parameters, and ascorbate transport proteins. Uptake into cells is mediated by two families of transport proteins, namely, the solute carrier gene family 23, consisting of sodium-dependent vitamin C transporters (SVCTs) 1 and 2, and the SLC2 family of glucose transporters (GLUTs)...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28477101/antioxidant-anticancer-and-electrochemical-redox-properties-of-new-bis-2-3-dihydroquinazolin-4-1h-one-derivatives
#10
Paramasivam Sivaguru, Kandasamy Parameswaran, Appaswami Lalitha
In this paper, a series of bis(2,3-dihydroquinazolin-4(1H)-one) derivatives (4a-i, 10a-k) were synthesized by the one-pot pseudo-five-component reaction of isatoic anhydride with aromatic aldehydes and aromatic amines under reflux in glacial acetic acid. The synthesized compounds were screened for their antioxidant properties using the DPPH radical scavenging method. Compounds 4i and 10h showed potent radical scavenging activities at 20 [Formula: see text] compared to BHA and ascorbic acid. The anticancer activity of compound 4f was evaluated against human breast cancer cell line (MCF 7), and the observed [Formula: see text] was found to be 11...
May 5, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28459517/effect-of-fanbaicao-herba-potentillae-discoloris-oil-on-the-expression-of-p21-and-cdk4-in-hepg2-cells
#11
Lei Liu, Guang Chen, Baixin Wang, Liping Chen, Shuqiu Wang, Zhixin Liu, Xiaoru Ma, Fangfang Wang, Yanfeng Liang, Jiamei Wu, Zhiwei Yang
OBJECTIVE: To research the anti-cancer mechanism of the Traditional Chinese Medicine Fanbaicao (Herba Potentillae Discoloris) oil in the human hepatoma cell line HepG2. METHODS: Gas chromatography was used to analyze the components of Fanbaicao (Herba Potentillae Discoloris). We tested the inhibitory effect of Fanbaicao (Herba Potentillae Discoloris) oil on the human hepatoma cell line HepG2 in vitro using 3-(4, 5-Dimet hylt hiazol-2-yl)-2,5-dip henyltetrazolium bromide assays...
August 2016: Journal of Traditional Chinese Medicine, Chung i Tsa Chih Ying Wen Pan
https://www.readbyqxmd.com/read/28440509/modulation-of-mmp-2-and-9-secretion-by-cytokines-inducers-and-inhibitors-in-human-melanoma-a-2058-cells
#12
M Waheed Roomi, Tatiana Kalinovsky, Aleksandra Niedzwiecki, Matthias Rath
Melanoma, an extremely aggressive cancer, causes the most skin cancer-related deaths, due to metastasis to other areas of the body, such as lymph nodes, lungs, liver, brain or bone. It is characterized by high levels of matrix metalloproteinase (MMP)-2 and -9 secretions that degrade the extracellular matrix and basement membrane, allowing cancer cells to spread to distal organs. Various cytokines, mitogens, growth factors, inducers and inhibitors control MMP activities. We investigated the roles of these in regulation of MMP-2 and -9 in human melanoma A-2058 cells...
April 24, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28433833/in-vitro-antitumor-activity-metal-uptake-and-reactivity-with-ascorbic-acid-and-bsa-of-some-gold-iii-complexes-with-n-n-ethylenediamine-bidentate-ester-ligands
#13
Nebojša Pantelić, Bojana B Zmejkovski, Branka Kolundžija, Marija Đorđić Crnogorac, Jelena M Vujić, Biljana Dojčinović, Srećko R Trifunović, Tatjana P Stanojković, Tibor J Sabo, Goran N Kaluđerović
Four novel gold(III) complexes of general formulae [AuCl2{(S,S)-R2eddl}]PF6 (R2eddl=O,O'-dialkyl-(S,S)-ethylenediamine-N,N'-di-2-(4-methyl)pentanoate, R=n-Pr, n-Bu, n-Pe, i-Bu; 1-4, respectively), were synthesized and characterized by elemental analysis, UV/Vis, IR, and NMR spectroscopy, as well as high resolution mass spectrometry. Density functional theory calculations pointed out that (R,R)-N,N'-configuration diastereoisomers were energetically the most favorable. Duo to high cytotoxic activity complex 3 was chosen for stability study in DMSO, no decomposition occurs within 24h, and for the reaction with ascorbic acid in which was reduced immediately...
April 4, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28433662/iron-and-thiol-redox-signaling-in-cancer-an-exquisite-balance-to-escape-ferroptosis
#14
REVIEW
Shinya Toyokuni, Fumiya Ito, Kyoko Yamashita, Yasumasa Okazaki, Shinya Akatsuka
Epidemiological data indicate a constant worldwide increase in cancer mortality, although the age of onset is increasing. Recent accumulation of genomic data on human cancer via next-generation sequencing confirmed that cancer is a disease of genome alteration. In many cancers, the Nrf2 transcription system is activated via mutations either in Nrf2 or Keap1 ubiquitin ligase, leading to persistent activation of the genes with antioxidative functions. Furthermore, deep sequencing of passenger mutations is clarifying responsible cancer causative agent(s) in each case, including aging, APOBEC activation, smoking and UV...
April 19, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28433532/exci-cest-exploiting-pharmaceutical-excipients-as-mri-cest-contrast-agents-for-tumor-imaging
#15
Dario Livio Longo, Fatima Zzahra Moustaghfir, Alexandre Zerbo, Lorena Consolino, Annasofia Anemone, Martina Bracesco, Silvio Aime
Chemical Exchange Saturation Transfer (CEST) approach is a novel tool within magnetic resonance imaging (MRI) that allows visualization of molecules possessing exchangeable protons with water. Many molecules, employed as excipients for the formulation of finished drug products, are endowed with hydroxyl, amine or amide protons, thus can be exploitable as MRI-CEST contrast agents. Their high safety profiles allow them to be injected at very high doses. Here we investigated the MRI-CEST properties of several excipients (ascorbic acid, sucrose, N-acetyl-d-glucosamine, meglumine and 2-pyrrolidone) and tested them as tumor-detecting agents in two different murine tumor models (breast and melanoma cancers)...
April 20, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28427227/high-dose-ascorbate-and-arsenic-trioxide-selectively-kill-acute-myeloid-leukemia-and-acute-promyelocytic-leukemia-blasts-in-vitro
#16
Nélida I Noguera, Elvira Pelosi, Daniela F Angelini, Maria Liliana Piredda, Gisella Guerrera, Eleonora Piras, Luca Battistini, Lauretta Massai, Anna Berardi, Gianfranco Catalano, Laura Cicconi, Germana Castelli, Agnese D'Angiò, Luca Pasquini, Grazia Graziani, Giuseppe Fioritoni, Maria Teresa Voso, Domenico Mastrangelo, Ugo Testa, Francesco Lo-Coco
The use of high-dose ascorbate (ASC) for the treatment of human cancer has been attempted several decades ago and has been recently revived by several in vitro and in vivo studies in solid tumors. We tested the cytotoxic effects of ASC, alone or in combination with arsenic trioxide (ATO) in acute myeloid leukemia (AML) and acute promyelocytic leukemia (APL). Leukemic cell lines and primary blasts from AML and APL patients were treated with graded concentrations of ASC, alone or in association with standard concentration (1 μM) of ATO...
May 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28404860/vitamin-c-puts-the-pedal-to-the-metal
#17
Monica Venere
Increased iron in cancer cells drives selective sensitization of tumors to ascorbate treatment to prolong survival.
April 12, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28399404/data-triumph-at-c
#18
Mark Levine, Pierre-Christian Violet
Despite historical controversy, pharmacologic ascorbate is emerging as promising cancer therapy via pro-oxidant chemistry. In this issue of Cancer Cell, Schoenfeld et al. describe how intracellular iron pools and reactive oxygen species drive pharmacologic ascorbate's selective toxicity to cancer cells in vitro, in mice, and in humans.
April 10, 2017: Cancer Cell
https://www.readbyqxmd.com/read/28385602/svct-2-determines-the-sensitivity-to-ascorbate-induced-cell-death-in-cholangiocarcinoma-cell-lines-and-patient-derived-xenografts
#19
Changzheng Wang, Hongwei Lv, Wen Yang, Ting Li, Tian Fang, Guishuai Lv, Qin Han, Liwei Dong, Tianyi Jiang, Beige Jiang, Guangshun Yang, Hongyang Wang
Cholangiocarcinoma (CC) is a devastating malignancy with late diagnosis and poor response to conventional chemotherapy. Recent studies have revealed anti-cancer effect of vitamin C (l-ascorbic acid, ascorbate) in several types of cancer. However, the effect of l-ascorbic acid (AA) in CC remains elusive. Herein, we demonstrated that AA induced cytotoxicity in CC cells by generating intracellular reactive oxygen species (ROS), and subsequently DNA damage, ATP depletion, mTOR pathway inhibition. Moreover, AA worked synergistically with chemotherapeutic agent cisplatin to impair CC cells growth both in vitro and in vivo...
July 10, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28366679/o2-%C3%A2-and-h2o2-mediated-disruption-of-fe-metabolism-causes-the-differential-susceptibility-of-nsclc-and-gbm-cancer-cells-to-pharmacological-ascorbate
#20
Joshua D Schoenfeld, Zita A Sibenaller, Kranti A Mapuskar, Brett A Wagner, Kimberly L Cramer-Morales, Muhammad Furqan, Sonia Sandhu, Thomas L Carlisle, Mark C Smith, Taher Abu Hejleh, Daniel J Berg, Jun Zhang, John Keech, Kalpaj R Parekh, Sudershan Bhatia, Varun Monga, Kellie L Bodeker, Logan Ahmann, Sandy Vollstedt, Heather Brown, Erin P Shanahan Kauffman, Mary E Schall, Ray J Hohl, Gerald H Clamon, Jeremy D Greenlee, Matthew A Howard, Michael K Shultz, Brian J Smith, Dennis P Riley, Frederick E Domann, Joseph J Cullen, Garry R Buettner, John M Buatti, Douglas R Spitz, Bryan G Allen
Pharmacological ascorbate has been proposed as a potential anti-cancer agent when combined with radiation and chemotherapy. The anti-cancer effects of ascorbate are hypothesized to involve the autoxidation of ascorbate leading to increased steady-state levels of H2O2; however, the mechanism(s) for cancer cell-selective toxicity remain unknown. The current study shows that alterations in cancer cell mitochondrial oxidative metabolism resulting in increased levels of O2(⋅-) and H2O2 are capable of disrupting intracellular iron metabolism, thereby selectively sensitizing non-small-cell lung cancer (NSCLC) and glioblastoma (GBM) cells to ascorbate through pro-oxidant chemistry involving redox-active labile iron and H2O2...
April 10, 2017: Cancer Cell
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