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https://www.readbyqxmd.com/read/28335466/a-specific-mixture-of-nutrients-suppresses-ovarian-cancer-a-2780-tumor-incidence-growth-and-metastasis-to-lungs
#1
Mohd Waheed Roomi, Tatiana Kalinovsky, Matthias Rath, Aleksandra Niedzwiecki
Ovarian cancer is the deadliest gynecological malignancy in women, and fifth leading cause of death. Despite advances made in chemotherapy and surgery, the average time of clinical remission is approximately 2 years and the 5-year survival rate is 45%. Thus, there is an urgent need for the development of a novel therapeutic approach to ovarian cancer treatment. We investigated the effect of a specific nutrient mixture (EPQ) containing ascorbic acid, lysine, proline, green tea extract, and quercetin on human ovarian cancer cell A-2780 in vivo and in vitro...
March 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28328238/valproic-acid-induces-decreased-expression-of-h19-promoting-cell-apoptosis-in-a549-cells
#2
Yang Hao, Guodong Wang, Chao Lin, Dong Li, Zhonghao Ji, Fei Gao, Zhanjun Li, Dianfeng Liu, Dongxu Wang
It has been suggested that the imprinted gene, H19, plays a crucial role in the development of cancer. In the present study, we attempted to treat the abnormal expression and methylation status of H19 in A549 cells using valproic acid (VPA), ascorbic acid (Vc), and 5-aza-Cytidine (5-Aza). The results suggested that VPA administration could alter the expression pattern of H19, while the hypomethylation status of H19 DMR was unchanged. Furthermore, overexpression of HDAC1 and DNMT1 was associated with decreased expression of H19 in VPA-treated cells...
March 22, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28322144/antioxidant-and-antiproliferative-potential-of-fruiting-bodies-of-the-wild-growing-king-bolete-mushroom-boletus-edulis-agaricomycetes-from-western-serbia
#3
Aleksandra Novakovic, Maja Karaman, Sonja Kaisarevic, Tanja Radusin, Nebojsa Llic
The aim of this work was to study the bioactivity of crude aqueous and ethanolic extracts of Boletus edulis prepared from caps and stipes of wild-growing basidiocarps collected from the Prijepolje region (western Serbia). The bioactivity screening included antioxidant (2,2-diphenyl-l-picrylhydrazyl [DPPH], nitric oxide, super-oxide anion*, and hydroxyl radicals and ferric-reducing antioxidant power) and antiproliferative MTT assays (human breast MCF-7 cancer cell line). In addition, all extracts were primarily characterized by ultraviolet/visible spectrophotometry to determine total phenolic and flavonoid contents...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/28280522/triethylenetetramine-synergizes-with-pharmacologic-ascorbic-acid-in-hydrogen-peroxide-mediated-selective-toxicity-to-breast-cancer-cell
#4
Lianlian Wang, Xiaofang Luo, Cong Li, Yubing Huang, Ping Xu, Laetitia H Lloyd-Davies, Thibaut Delplancke, Chuan Peng, Rufei Gao, Hongbo Qi, Chao Tong, Philip Baker
Breast cancer is characterized by overexpression of superoxide dismutase (SOD) and downregulation of catalase and more resistance to hydrogen peroxide (H2O2) than normal cells. Thus, relatively high H2O2 promotes breast cancer cell growth and proliferation. However, excessive intracellular H2O2 leads to death of breast cancer cells. In cancer cells, high level ascorbic acid (Asc) is able to be autoxidized and thus provides an electron to oxygen to generate H2O2. In the present study, we demonstrated that triethylenetetramine (TETA) enhances Asc autoxidation and thus elevates H2O2 production in MCF-7 cells...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28280325/novel-route-synthesis-of-porous-and-solid-gold-nanoparticles-for-investigating-their-comparative-performance-as-contrast-agent-in-computed-tomography-scan-and-effect-on-liver-and-kidney-function
#5
Farooq Aziz, Ayesha Ihsan, Aalia Nazir, Ishaq Ahmad, Sadia Zafar Bajwa, Asma Rehman, Abdoulaye Diallo, Waheed S Khan
Gold nanoparticles (GNPs) with dimension in the range of 1-100 nm have a prominent role in a number of biomedical applications like imaging, drug delivery, and cancer therapy owing to their unique optical features and biocompatibility. In this work, we report a novel technique for the synthesis of two types of GNPs namely porous gold nanoparticles (PGNPs) and solid gold nanoparticles (SGNPs). PGNPs of size 35 nm were fabricated by reduction of gold (III) solution with lecithin followed by addition of L-ascorbic acid and tri-sodium citrate, whereas SGNPs with a dimension of 28 nm were prepared by reflux method using lecithin as a single reducing agent...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28278665/bioactive-phenylpropanoid-analogues-from-piper-betle-l-var-haldia-leaves
#6
Akhtar Atiya, Barij Nayan Sinha, Uma Ranjan Lal
Phytochemical analyses of the chloroform extract of Piper betle L. var. birkoli, Piperaceae, leaves led to the isolation of two new phenylpropanoid analogues: bis-chavicol dodecanoyl ester (2) and bis-hydroxychavicol dodecanoyl ester (3), along with one known compound: allyl-3-methoxy-4-hydroxybenzene (1) on the basis of spectroscopic data 1D ((1)H and (13)C) and 2D ((1)H-(1)H COSY and HMBC) NMR, as well as ESI-MS, FT-IR, HR-ESI-MS and LC-ESI-MS. Compound 2 and 3 exhibited excellent antioxidant DPPH radical scavenging activity with IC50 values of 12...
February 15, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28265285/accuracy-of-colon-capsule-endoscopy-in-detecting-colorectal-polyps-in-individuals-with-familial-colorectal-cancer-could-we-avoid-colonoscopies
#7
Cristina Alvarez-Urturi, Gloria Fernández-Esparrach, Inés Ana Ibáñez, Cristina Rodríguez De Miguel, Josep Maria Dedeu, Xavier Bessa, Henry Córdova, Maria Pellisé, Francesc Balaguer, Angels Ginés, Luis Barranco, Isis K Araujo, Montserrat Andreu, Josep Llach, Antoni Castells, Begoña González-Suarez
Background. Individuals with a family history of colorectal cancer (CRC) have an increased risk of CRC. We evaluated the diagnostic yield of CCE in the detection of lesions and also two different colon preparations. Methods. A prospective multicenter study was designed to assess CCE diagnostic yield in a cohort of asymptomatic individuals with a family history of CRC. CCE and colonoscopy were performed on the same day by 2 endoscopists who were blinded to the results of the other procedure. Results. Fifty-three participants were enrolled...
2017: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/28230819/chornobyl-catastrophe-cytogenetic-effects-of-low-dose-ionizing-radiation-and-their-modification
#8
E A Domina
Among the long-term effects of the Chornobyl disaster the greatest concern of international medical and scientific community is given to the established fact of excess of the spontaneous level of cancer incidence in the exposed population. According to mo-dern concepts, the accumulation of chromosome aberrations, especially in radiosensitive cells, could be potentially oncogenic, and low doses of ionizing radiation could be promoters of the radiation-induced carcinogenesis. The results of our studies have shown that such substances as thymalin, inosine, ascorbic acid, caffeine could modify radiation-induced cytogenetic effects in peripheral blood lymphocytes of healthy individuals and exert protective or sensitizing action dependent on their concentrations, cell radiosensitivity, dose of irradiation, and relative biologic effectiveness of ionizing radiation...
December 2016: Experimental Oncology
https://www.readbyqxmd.com/read/28229908/multiple-myeloma-tumor-cells-are-selectively-killed-by-pharmacologically-dosed-ascorbic-acid
#9
Jiliang Xia, Hongwei Xu, Xiaoyan Zhang, Chantal Allamargot, Kristen L Coleman, Randy Nessler, Ivana Frech, Guido Tricot, Fenghuang Zhan
High-dose chemotherapies to treat multiple myeloma (MM) can be life-threatening due to toxicities to normal cells and there is a need to target only tumor cells and/or lower standard drug dosage without losing efficacy. We show that pharmacologically-dosed ascorbic acid (PAA), in the presence of iron, leads to the formation of highly reactive oxygen species (ROS) resulting in cell death. PAA selectively kills CD138(+) MM tumor cells derived from MM and smoldering MM (SMM) but not from monoclonal gammopathy undetermined significance (MGUS) patients...
February 16, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28223550/nadh-autofluorescence-a-new-metabolic-biomarker-for-cancer-stem-cells-identification-of-vitamin-c-and-cape-as-natural-products-targeting-stemness
#10
Gloria Bonuccelli, Ernestina Marianna De Francesco, Rianne de Boer, Herbert B Tanowitz, Michael P Lisanti
Here, we assembled a broad molecular "tool-kit" to interrogate the role of metabolic heterogeneity in the propagation of cancer stem-like cells (CSCs). First, we subjected MCF7 cells to "metabolic fractionation" by flow cytometry, using fluorescent mitochondrial probes to detect PCG1α activity, as well ROS and hydrogen-peroxide (H2O2) production; NADH levels were also monitored by auto-fluorescence. Then, the various cell populations were functionally assessed for "stem cell activity", using the mammosphere assay (3D-spheroids)...
February 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28222397/a-novel-approach-towards-design-synthesis-and-evaluation-of-some-schiff-base-analogues-of-2-aminopyridine-and-2-aminobezothiazole-against-hepatocellular-carcinoma
#11
Shinu Chacko, Subir Samanta
Hepatocellular carcinoma is the most common primary malignancy of the liver with poor prognosis. In this study novel, Schiff's bases of 2-aminopyridine (SSSC-26 to 31) and 2-aminobenzothiazole (SSSC-32 to 37) were designed, synthesised and evaluated for antioxidant potential using DPPH method, and anti-hepatocellular carcinoma property using diethylnitrosamine (DEN) induced hepatocellular carcinoma rat model. The in-silico pharmacokinetic, rule of five and toxicity studies reveals that all the leads have an excellent intrinsic quality and sufficient structural features necessary for an oral activity...
February 18, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28210221/pharmacogenomic-characterization-and-isobologram-analysis-of-the-combination-of-ascorbic-acid-and-curcumin-two-main-metabolites-of-curcuma-longa-in-cancer-cells
#12
Edna Ooko, Onat Kadioglu, Henry J Greten, Thomas Efferth
Curcuma longa has long been used in China and India as anti-inflammatory agent to treat a wide variety of conditions and also as a spice for varied curry preparations. The chemoprofile of the Curcuma species exhibits the presence of varied phytochemicals with curcumin being present in all three species but AA only being shown in C. longa. This study explored the effect of a curcumin/AA combination on human cancer cell lines. The curcumin/AA combination was assessed by isobologram analysis using the Loewe additivity drug interaction model...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28205649/comparative-studies-of-oxaliplatin-based-platinum-iv-complexes-in-different-in-vitro-and-in-vivo-tumor-models
#13
Simone Göschl, Ekaterina Schreiber-Brynzak, Verena Pichler, Klaudia Cseh, Petra Heffeter, Ute Jungwirth, Michael A Jakupec, Walter Berger, Bernhard K Keppler
Using platinum(iv) prodrugs of clinically established platinum(ii) compounds is a strategy to overcome side effects and acquired resistances. We studied four oxaliplatin-derived platinum(iv) complexes with varying axial ligands in various in vitro and in vivo settings. The ability to interfere with DNA (pUC19) in the presence and absence of a reducing agent (ascorbic acid) was investigated in cell-free experiments. Cytotoxicity was compared under normoxic and hypoxic conditions in monolayer cultures and multicellular spheroids of colon carcinoma cell lines...
February 16, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28181456/dual-plasmonic-gold-nanostars-for-photoacoustic-imaging-and-photothermal-therapy
#14
Vijay Raghavan, Cathal O'Flatharta, Roisin Dwyer, Aedán Breathnach, Haroon Zafar, Peter Dockery, Antony Wheatley, Ivan Keogh, Martin Leahy, Malini Olivo
AIM: To fabricate multimodal nanoconstruct that act as a single node for photoacoustic imaging (PAI) and photothermal therapy (PTT) in the fight against cancer. MATERIALS & METHODS: Dual plasmonic gold nanostars (DPGNS) were chemically synthesized by reducing gold precursor using ascorbic acid and silver ions as shape directing agent. PAI and PTT were performed using commonly available 1064 nm laser source on DPGNS embedded tumor xenografts on mice. RESULTS & CONCLUSION: Photoacoustic amplitude increase with longer wavelength source and with silica coating of DPGNS...
February 9, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28155925/an-enzyme-induced-au-ag-core-shell-nanostructure-used-for-an-ultrasensitive-surface-enhanced-raman-scattering-immunoassay-of-cancer-biomarkers
#15
Lin Yang, Ming Xuan Gao, Lei Zhan, Min Gong, Shu Jun Zhen, Cheng Zhi Huang
Early detection of cancer is helpful for the control and prevention of diseases. Due to the low content of cancer biomarkers in the early disease phases, however, an ultrasensitive and selective method is critical. In this contribution, an ultrasensitive surface-enhanced Raman scattering (SERS) immunoassay is newly developed with the principle of introducing a common enzyme-induced deposition (EID) reaction to coat a silver layer on the surface of gold nanoparticles and to form a core-shell nanostructure of Au@Ag...
February 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28126339/fabrication-of-silica-coated-gold-nanorods-and-investigation-of-their-property-of-photothermal-conversion
#16
Tomoya Inose, Takahiro Oikawa, Kyosuke Shibuya, Masayuki Tokunaga, Keiichiro Hatoyama, Kouichi Nakashima, Takashi Kamei, Kohsuke Gonda, Yoshio Kobayashi
This study described the preparation of silica-coated Au nanorods (AuNR/SiO2) in a colloidal solution, assessed their property of photothermal conversion, and investigated their ability to kill cancer cells using photothermal conversion. Au-seed nanoparticles were produced by reducing hydrogen tetrachloroaurate (HAuCl4) with sodium borohydride (NaBH4) in aqueous n-hexadecyltrimethylammonium bromide (CTAB) solution. AuNRs were then fabricated by reducing HAuCl4 and silver nitrate (AgNO3) with l-ascorbic acid in the aqueous CTAB solution in the presence of Au-seed nanoparticles...
January 23, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28123717/ascorbic-acid-does-not-reduce-the-anticancer-effect-of-radiotherapy
#17
Yoichiro Hosokawa, Ryo Saga, Satoru Monzen, Shingo Terashima, Eichi Tsuruga
The present study hypothesized that the therapeutic use of ascorbic acid (AsA) in combination with radiation may reduce therapy-related side effects and increase the antitumor effects. The aim of the study was to examine the association between the scavenged activity of AsA and the biological anticancer effect of hydroxyl (OH) radicals generated by X-ray irradiation. Cell survival, DNA fragmentation of human leukemia HL60 cells and the amount of OH radicals were investigated following X-ray irradiation and AsA treatment...
January 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28112361/modulation-of-mmp-2-and-mmp-9-secretion-by-cytokines-inducers-and-inhibitors-in-human-glioblastoma-t-98g-cells
#18
M Waheed Roomi, Tatiana Kalinovsky, Matthias Rath, Aleksandra Niedzwiecki
Brain tumors are highly aggressive, characterized by the secretion of high levels of matrix metalloproteinase (MMP)-2 and MMP-9 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 activity. We investigated the roles of these in the regulation of MMP-2 and MMP-9 in human glioblastoma T-98G cells. Human T-98G cells were grown in DME supplemented with 15% fetal bovine serum and antibiotics in 24-well tissue culture plates...
January 19, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28111315/hypoxic-behavior-in-cells-under-controlled-microfluidic-environment
#19
Adnan Morshed, Prashanta Dutta
BACKGROUND: Depleted oxygen levels, known as hypoxia, causes considerable changes in the cellular metabolism. Hypoxia-inducible factors (HIF) act as the major protagonist in orchestrating manifold hypoxic responses by escaping cellular degradation mechanisms. These complex and dynamic intracellular responses are significantly dependent on the extracellular environment. In this study, we present a detailed model of a hypoxic cellular microenvironment in a microfluidic setting involving HIF hydroxylation...
April 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28108513/relb-expression-determines-the-differential-effects-of-ascorbic-acid-in-normal-and-cancer-cells
#20
Xiaowei Wei, Yong Xu, Fang Fang Xu, Luksana Chaiswing, David Schnell, Teresa Noel, Chi Wang, Jinfei Chen, Daret K St Clair, William H St Clair
Cancer cells typically experience higher oxidative stress than normal cells, such that elevating pro-oxidant levels can trigger cancer cell death. Although pre-exposure to mild oxidative agents will sensitize cancer cells to radiation, this pre-exposure may also activate the adaptive stress defense system in normal cells. Ascorbic acid is a prototype redox modulator that when infused intravenously appears to kill cancers without injury to normal tissues; however, the mechanisms involved remain elusive. In this study, we show how ascorbic acid kills cancer cells and sensitizes prostate cancer to radiation therapy while also conferring protection upon normal prostate epithelial cells against radiation-induced injury...
March 15, 2017: Cancer Research
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