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Platinum resistance

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https://www.readbyqxmd.com/read/29350035/selective-proton-deuteron-transport-through-nafion-graphene-nafion-sandwich-structures-at-very-high-current-density
#1
Saheed Bukola, Ying Liang, Carol Korzeniewski, Joel Harris, Stephen Creager
Ion current densities near 1 A cm-2 at modest bias voltages (< 200 mV) are reported for proton and deuteron transmission across single-layer graphene in polyelectrolyte-membrane (PEM)-style hydrogen pump cells. The graphene is sandwiched between two Nafion membranes and covers the entire area between two platinum-carbon electrodes, such that proton transfer is forced to occur through the graphene layer. Raman spectroscopy confirms that buried graphene layers are single-layer and relatively free of defects following the hot-press procedure used to make the sandwich structures...
January 19, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29349448/a-study-on-platinum-iv-species-containing-an-estrogen-receptor-modulator-to-reverse-tamoxifen-resistance-of-breast-cancer
#2
Weiwei Hu, Jian Zhao, Wuyang Hua, Shaohua Gou
Several dual-action Tam-Pt(iv) complexes derived from tamoxifen (Tam) and platinum(ii) drugs were designed and synthesized for targeting estrogen receptors (ERs) and DNA. These novel compounds not only exhibited potent cytotoxicity against breast cancer cells, but also reversed the tamoxifen resistance of TamR-MCF-7 cancer cells. Computational docking assays together with cellular uptake data demonstrated that the ER ligand portion of these conjugates plays a targeting role in ER-positive tumor cells and promotes the uptake of platinum via an estrogen receptor-mediated pathway...
January 19, 2018: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29344971/clear-cell-carcinomas-of-the-ovary-and-kidney-clarity-through-genomics
#3
REVIEW
Jennifer X Ji, Yi Kan Wang, Dawn R Cochrane, David G Huntsman
Clear cell ovarian carcinoma (CCOC) and clear cell renal cell carcinoma (ccRCC) both feature clear cytoplasm due to the accumulation of cytoplasmic glycogen. Genomic studies have demonstrated several mutational similarities between these two diseases including frequent alterations in the chromatin remodeling SWI/SNF and cellular proliferation PI3K/mTOR pathways, as well as a shared hypoxia-like mRNA expression signature. Although many targeted treatment options have been approved for advance stage ccRCC, CCOC patients are still treated with conventional platinum and taxane chemotherapy, to which they are resistant...
January 17, 2018: Journal of Pathology
https://www.readbyqxmd.com/read/29344837/evaluation-of-the-profile-and-mechanism-of-neurotoxicity-of-water-soluble-cu-p-4-pf6-and-au-p-4-pf6-p-thp-or-pta-anticancer-complexes
#4
C Ceresa, G Nicolini, S Semperboni, V Gandin, M Monfrini, F Avezza, P Alberti, A Bravin, M Pellei, C Santini, Guido Cavaletti
[Cu(thp)4]PF6, [Cu(PTA)4]PF6, [Au(thp)4]PF6 and [Au(PTA)4]PF6 are phosphane (thp = tris(hydroxymethyl)phosphane; PTA = 1,3,5-triaza-7-phosphaadamantane) copper(I) and gold(I) water-soluble complexes characterized by high anticancer activity in a wide range of solid tumors, often able to overcome drug resistance of platinum-based compounds. For these reasons, they have been proposed as a valid alternative to platinum-based chemotherapeutic drugs (e.g., cisplatin and oxaliplatin). In vitro experiments performed on organotypic cultures of dorsal root ganglia (DRG) from 15-day-old rat embryos revealed that copper-based compounds were not neurotoxic even at concentrations higher than the IC50 obtained in human cancer cells while [Au(PTA)4]PF6 was neurotoxic at lower concentration than IC50 in cancer cell lines...
January 17, 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/29340396/synthesis-and-antiproliferative-activity-of-a-series-of-new-platinum-and-palladium-diphosphane-complexes
#5
Carleen Cullinane, Glen B Deacon, Penny R Drago, Anja P Erven, Peter C Junk, Jenny Luu, Gerd Meyer, Simon Schmitz, Ingo Ott, Julia Schur, Lorraine K Webster, Axel Klein
New organometallic complexes [M(dppe)(R)2] {where M = Pt or Pd, dppe = 1,2-bis(diphenylphosphano)ethane, and R = C6F4H-x (x = 6,5,4), C6F3H2-3,5, C6F3H2-5,6, C6F3H2-3,6, C6F4(OMe)-4, and C6F4(cyclo-C5H10N)-4, the numbers x refer to the positions of the protons in the polyfluoroaryl ligands} were synthesised either through transmetalation from the dichlorido complexes [M(dppe)Cl2] or through ligand exchange using [M(diene)Cl2] precursor complexes with diene = 1,5-cyclooctadiene (cod) or 1,5-hexadiene (hex). Alternatively, [M(dppX)Cl(R)] complexes with dppX = dppm (1,1-bis(diphenylphosphano)methane), dppe, dppp (1,3-bis(diphenylphosphano)propane), and dppb (1,4-bis(diphenylphosphano)butane) were prepared in decarboxylation reactions from thallium(i) carboxylates Tl(O2CR)...
January 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29338446/the-latest-animal-models-of-ovarian-cancer-for-novel-drug-discovery
#6
Elizabeth Magnotti, Wayne A Marasco
Epithelial ovarian cancer is a heterogeneous disease classified into five subtypes, each with a different molecular profile. Most cases of ovarian cancer are diagnosed after metastasis of the primary tumor and are resistant to traditional platinum-based chemotherapeutics. Mouse models of ovarian cancer have been utilized to discern ovarian cancer tumorigenesis and the tumor's response to therapeutics. Areas covered: The authors provide a review of mouse models currently employed to understand ovarian cancer...
January 17, 2018: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/29334076/pt-decorated-mos-sub-2-sub-nanoflakes-for-ultrasensitive-resistive-humidity-sensor
#7
Debasree Burman, Sumita Santra, Panchanan Pramanik, Prasanta Kumar Guha
In this work, we report the fabrication of a low power, humidity sensor where platinum nanoparticles (NPs) decorated few-layered Molybdenum disulphide (MoS<sub>2</sub>) nanoflakes have been used as the sensing layer. A mixed solvent was used to exfoliate the nanoflakes from the bulk powder. Then the Pt/MoS<sub>2</sub> composites were prepared by reducing Pt NPs from chloroplatinic acid hexahydrate using a novel reduction technique using sulfide salt. The successful reduction and composite preparation were confirmed using various material characterization tools like Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and UV-visible spectroscopy (UV-Vis)...
January 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29313821/electroarchitected-porous-platinum-on-metallic-multijunction-nanolayers-to-optimize-their-optical-properties-for-infrared-sensor-application
#8
Sarmiza Elena Stanca, Frank Haenschke, Gabriel Zieger, Jan Dellith, Andrea Dellith, Andreas Ihring, Johannes Belkner, Hans-Georg Meyer
Tailoring the physicochemical properties of the metallic multijunction nanolayers is a prerequisite for the development of microelectronics. From this perspective, a desired lower reflectance of infrared radiation was achieved by an electrochemical deposition of porous platinum in nonaqueous media on silver mirror supported nickel-chrom and nickel-titanium metallic films with incremental decreasing thicknesses from 80 nm to 10 nm. The electroassembled architectures were examined by means of SEM and FTIR and it was observed that the layer and sublayer thicknesses and resistivities have a substantial effect upon the porous platinum morphology and its optical properties...
January 9, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29311582/large-area-growth-of-mote2-films-as-high-performance-counter-electrodes-for-dye-sensitized-solar-cells
#9
Sajjad Hussain, Supriya A Patil, Dhanasekaran Vikraman, Naveed Mengal, Hailiang Liu, Wooseok Song, Ki-Seok An, Sung Hoon Jeong, Hak-Sung Kim, Jongwan Jung
A cost effective and efficient alternative counter electrode (CE) to replace commercially existing platinum (Pt)-based CEs for dye-sensitized solar cells (DSSCs) is necessary to make DSSCs competitive. Herein, we report the large-area growth of molybdenum telluride (MoTe2) thin films by sputtering-chemical vapor deposition (CVD) on conductive glass substrates for Pt-free CEs of DSSCs. Cyclic voltammetry (CV), Tafel curve analysis, and electrochemical impedance spectroscopy (EIS) results showed that the as-synthesized MoTe2 exhibited good electrocatalytic properties and a low charge transfer resistance at the electrolyte-electrode interface...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29301826/p53-reactive-t-cells-are-associated-with-clinical-benefit-in-patients-with-platinum-resistant-epithelial-ovarian-cancer-after-treatment-with-a-p53-vaccine-and-gemcitabine-chemotherapy
#10
Nicola R Hardwick, Paul Frankel, Christopher Ruel, Julie Kilpatrick, Weimin Tsai, Ferdynand Kos, Teodora I Kaltcheva, Lucille Leong, Robert Morgan, Vincent Chung, Raechelle Tinsley, Melissa Eng, Sharon P Wilczynski, Joshua D I Ellenhorn, Don J Diamond, Mihaela Cristea
PURPOSE: To conduct a Phase I trial of a Modified Vaccinia Ankara vaccine delivering wild type human p53 (p53MVA) in combination with gemcitabine chemotherapy in patients with platinum-resistant ovarian cancer. EXPERIMENTAL DESIGN: Patients received gemcitabine on days 1 and 8 and p53MVA vaccine on day 15, during the first 3 cycles of chemotherapy. Toxicity was classified using the NCI Common Toxicity Criteria and clinical response assessed by CT scan. Peripheral blood samples were collected for immunophenotyping and monitoring of anti-p53 immune responses...
January 4, 2018: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/29301278/theaflavin-3-3-digallate-enhances-the-inhibitory-effect-of-cisplatin-by-regulating-the-copper-transporter-1-and-glutathione-in-human-ovarian-cancer-cells
#11
Haibo Pan, Eunhye Kim, Gary O Rankin, Yon Rojanasakul, Youying Tu, Yi Charlie Chen
Ovarian cancer has the highest fatality rate among the gynecologic cancers. The side effects, high relapse rate, and drug resistance lead to low long-term survival rate (less than 40%) of patients with advanced ovarian cancer. Theaflavin-3,3'-digallate (TF3), a black tea polyphenol, showed less cytotoxicity to normal ovarian cells than ovarian cancer cells. We aimed to investigate whether TF3 could potentiate the inhibitory effect of cisplatin against human ovarian cancer cell lines. In the present study, combined treatment with TF3 and cisplatin showed a synergistic cytotoxicity against A2780/CP70 and OVCAR3 cells...
January 2, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29296209/the-prognostic-value-of-ki67-in-ovarian-high-grade-serous-carcinoma-an-11-year-cohort-study-of-chinese-patients
#12
Ming Chen, Shuzhong Yao, Qinghua Cao, Meng Xia, Junxiu Liu, Mian He
Objective: This study sought to assess the prognostic role of Ki67 in primary ovarian high-grade serous carcinoma (HGSC) and to determine whether Ki67 expression can predict responsiveness to platinum and paclitaxel chemotherapy. Results: A total of 318 women were included in the analysis and the median follow-up time was 48 months (range, 3-150 months). Ki67 proliferation indices ranged from 3% to 95% with a median of 40%. Using 40% as the cut-off value for the Ki67 index, we classified 141 patients as having low Ki67 expression and 177 patients as having high Ki67 expression...
December 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/29290023/immunological-hallmarks-of-cis-ddp-resistant-lewis-lung-carcinoma-cells
#13
Olexandr Fedorchuk, Yaroslav Susak, Mariia Rudyk, Nataliia Senchylo, Nataliia Khranovska, Oksana Skachkova, Larysa Skivka
PURPOSE: Tumor cell resistance to platinum-based chemotherapeutic agents is one of the major hurdles to successful cancer treatment with these drugs, and is associated with alterations in tumor cell immune evasion and immunomodulatory properties. Immunocyte targeting is considered as a relevant approach to fight drug-resistant cancer. In this study, immunological hallmarks of cis-DDP-resistant Lewis lung carcinoma cells (LLC/R9) were investigated. METHODS: Immunological features of LLC/R9 cells cultured in vitro in normoxic and hypoxic conditions as well as of those that were grown in vivo were examined...
December 30, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/29288364/mirna-signature-predicts-the-response-of-patients-with-advanced-lung-adenocarcinoma-to-platinum-based-treatment
#14
Xiaoyue Xu, Shaorong Yu, Wenbo Sun, Xiaobing Qin, Yan Chen, Leilei Zhou, Rui Lou, Shuchen Dong, Bo Shen, Jianzhong Wu, Jialan Zang, Haixia Cao, Meiqi Shi, Qin Zhang, Jifeng Feng
BACKGROUND: Accumulating literature proved that miRNAs can regulate the sensitivity of platinum and act as a promising candidate to predict the response of patients with lung adenocarcinoma to chemotherapy. However, most studies on miRNAs were restricted to in vitro experiments. This study aimed to evaluate whether miRNAs alone or in combination (miRNA signature) can act as predictive biomarkers of platinum-based chemotherapy in patients with lung adenocarcinoma. METHODS: Eight miRNAs that most probably predict the efficacy of platinum were screened in 111 tumor tissues of lung adenocarcinoma...
December 29, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/29283565/shape-control-of-pt-ru-nanocrystals-tuning-surface-structure-for-enhanced-electrocatalytic-methanol-oxidation
#15
Liang Huang, Xueping Zhang, Qingqing Wang, Yujie Han, Youxing Fang, Shaojun Dong
Despite that both electrochemical experiments and density functional theory calculations have testified the superior electrocatalytic activity and CO-poisoning tolerance of platinum-ruthenium (PtRu) alloy nanoparticles toward the methanol oxidation reaction (MOR), the facet-dependent electrocatalytic properties of PtRu nanoparticles are scarcely revealed because it is extremely difficult to synthesize well-defined facets enclosed PtRu nanocrystals. Herein, we for the first report a general synthesis of ultrathin PtRu nanocrystals with tuneable morphologies (nanowires, nanorods and nanocubes) through a one-step solvothermal approach, and systematically investigate the structure-directing effects of different surfactants and the formation mechanism by control experiments and time-dependent studies...
December 28, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29282777/ag-n-c-carbon-nanorods-as-a-high-efficient-electrocatalyst-for-oxygen-reduction-reaction-in-alkaline-media
#16
Baichen Liu, Wanlin Dai, Zhiwei Lu, Jianshan Ye, Liuzhang Ouyang
In recent years, various Pt-free catalysts for the oxygen reduction reaction (ORR) attract great attention due to the limited natural abundance and high cost of platinum. Herein, Ag@N-C carbon nanorods for ORR were synthesized via chemical polymerization and pyrolysis methods by using pyrrole and silver nitrate as raw materials. The pyrolysis could significantly increase the specific surface area of as-synthesized catalyst as well as convert pyrrolic-N to graphitic-N and pyridinic-N. The results of electrochemical tests show that Ag@N-C-900 catalyst (pyrolyzed at 900 degrees C) exhibits highly efficient ORR catalytic activity, improved stability and better methanol resistance in comparison to Pt/C catalyst under alkaline media...
December 28, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29277822/bevacizumab-added-to-moderate-dose-chemotherapy-for-refractory-uterine-cancer
#17
Howard W Bruckner, Daniel Gurell, Azriel Hirschfeld
BACKGROUND/AIM: Bevacizumab (bev), when added to a moderate dose combination of previously failed cytotoxins, as a third- and fourth-line therapy for refractory gastric, cholangiocarcinoma, and ovarian cancers, produced high-quality responses. The regimen was based on preclinical models designed in order to simultaneously partner both bev and each of the cytotoxins with 4-5 synergistic drugs. PATIENTS AND METHODS: Eligible patients (n=9) had high-grade endometrial tumors and had failed standard chemotherapy...
January 2018: Anticancer Research
https://www.readbyqxmd.com/read/29275248/atoms-diffusion-induced-phase-engineering-of-platinum-gold-alloy-nanocrystals-with-high-electrocatalytic-performance-for-the-formic-acid-oxidation-reaction
#18
Fu-Min Li, Yong-Qiang Kang, Hui-Min Liu, Ya-Nan Zhai, Man-Cheng Hu, Yu Chen
Bimetallic noble metal nanocrystals have been widely applied in many fields, which generally are synthesized by the wet-chemistry reduction method. This work presents a purposely designed atoms diffusion induced phase engineering of PtAu alloy nanocrystals on platy Au substrate (PtAu-on-Au nanostructures) through simple hydrothermal treatment. Benefitting from the synergistic effects of component and structure, PtAu-on-Au nanostructures remarkably enhance the dehydrogenation pathway of the formic acid oxidation reaction (FAOR), and thus exhibit much higher FAOR activity and durability compared with Pt nanocrystals on platy Au substrate (Pt-on-Au nanostructures) and commercial Pd black due to an excellent stability of platy Au substrate and a high oxidation resistance of PtAu alloy nanocrystals...
December 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29258812/evaluating-bevacizumab-in-combination-with-folfiri-after-the-failure-of-platinum-etoposide-regimen-in-patients-with-advanced-poorly-differentiated-neuroendocrine-carcinoma-the-prodige-41-bevanec-randomized-phase-ii-study
#19
Thomas Walter, David Malka, Olivia Hentic, Catherine Lombard-Bohas, Karine Le Malicot, Denis Smith, Aurélie Ferru, Eric Assenat, Guillaume Cadiot, Astrid Lievre, Jean-Emmanuel Kurtz, Laetitia Dahan, Olivier Dubreuil, Vincent Hautefeuille, Céline Lepere, Alice Gangloff, Farid Elhajbi, Romain Coriat, Guillaume Roquin, Nadia Bouarioua, Victoire Granger, Jean-Yves Scoazec, Côme Lepage
INTRODUCTION: Patients with gastroenteropancreatic (GEP), metastatic or locally advanced, non-resectable, grade 3 poorly-differentiated neuroendocrine carcinoma (NEC) are treated with cisplatin (or carboplatin)-etoposide in first-line palliative chemotherapy (CT1). However, nearly all patients will develop resistance and there is no standard second-line treatment. AIM: PRODIGE 41-BEVANEC is an academic randomized, phase II study designed to evaluate the efficacy of bevacizumab in combination with FOLFIRI after failure of CT1 in unknown primary NEC and GEP-NEC...
December 6, 2017: Digestive and Liver Disease
https://www.readbyqxmd.com/read/29250200/update-on-squamous-cell-carcinoma-of-the-head-and-neck-asco-annual-meeting-2017
#20
REVIEW
Teresa Magnes, Alexander Egle, Richard Greil, Thomas Melchardt
At the annual ASCO meeting clinically relevant data concerning the management of advanced head and neck cancer that will influence clinical practice in the future were presented. Chemoradiation with high-dose cisplatin remains the mainstay of treatment for patients with locally advanced squamous cell head and neck cancer. Adjuvant therapy with afatinib following chemoradiation failed to show clinical benefit. The combination of bevacizumab with platinum-based chemotherapy improved progression-free survival but did not lead to a significant difference in overall survival compared to chemotherapy alone...
2017: Memo
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