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https://www.readbyqxmd.com/read/28726196/mechanisms-of-sensitivity-of-soft-tissue-sarcoma-cells-to-temozolomide
#1
R R Khusnutdinov, S V Boichuk
We studied the mechanisms of sensitivity of soft tissue sarcoma cells to alkylating agent temozolomide. The mechanisms of tumor cell sensitivity to temozolomide are complex and are determined by not only the level of O6-methylguanine-DNA-methyltransferase (MGTM) expression, but also activity of oncosuppressor protein p53. A-673 Ewing's sarcoma cells were found to be the most sensitive to temozolomide, whereas temozolomide-treated SK-LMS-1 leiomyosarcoma cells exhibited signs of cell aging.
July 18, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28718668/olea-europaea-leaf-extract-improves-the-efficacy-of-temozolomide-therapy-by-inducing-mgmt-methylation-and-reducing-p53-expression-un-glioblastoma
#2
Gulcin Tezcan, Berrin Tunca, Hilal Demirci, Ahmet Bekar, Mevlut Ozgur Taskapilioglu, Hasan Kocaeli, Unal Egeli, Gulsah Cecener, Sahsine Tolunay, Ozgur Vatan
Unmethylated O6-methylguanine-DNA-methyltransferase (MGMT) promoter leads to Temozolomide (TMZ) resistance in most of the glioblastoma multiforme (GBM) patients. We previously investigated the synergistic effect of Olea europaea leaf extract (OLE) on TMZ cytotoxicity through modulating microRNA expression. To date, knowledge about the effect of OLE on MGMT methylation is insufficient. The aim of the current study was to evaluate the potential modulating effect of OLE on the TMZ response of GBM tumors through MGMT methylation...
July 18, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28714697/molybdenum-oxide-nitrides-of-the-mo2-o-n-%C3%A2-5-type-on-the-way-to-mo2o5
#3
Dominik Weber, Manop Huber, Tatiana E Gorelik, Artem M Abakumov, Nils Becker, Oliver Niehaus, Christian Schwickert, Sean P Culver, Hans Boysen, Anatoliy Senyshyn, Rainer Pöttgen, Richard Dronskowski, Thorsten Ressler, Ute Kolb, Martin Lerch
Blue-colored molybdenum oxide nitrides of the Mo2(O,N,□)5 type were synthesized by direct nitridation of commercially available molybdenum trioxide with a mixture of gaseous ammonia and oxygen. Chemical composition, crystal structure, and stability of the obtained and hitherto unknown compounds are studied extensively. The average oxidation state of +5 for molybdenum is proven by Mo K near-edge X-ray absorption spectroscopy; the magnetic behavior is in agreement with compounds exhibiting Mo(V)O6 units. The new materials are stable up to ∼773 K in an inert gas atmosphere...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28672166/structures-and-gene-clusters-of-the-o-antigens-of-escherichia-albertii-o3-o4-o6-and-o7
#4
Olesya I Naumenko, Han Zheng, Sof'ya N Senchenkova, Hong Wang, Qun Li, Alexander S Shashkov, Jianping Wang, Yuriy A Knirel, Yanwen Xiong
The O-specific polysaccharides (OPSs) called O-antigens were obtained by mild acid degradation of the lipopolysaccharides of Escherichia albertii serotypes O3, O4, O6, and O7 and studied by sugar analysis along with 1D and 2D (1)H and (13)C NMR spectroscopy. The following structure was established for the OPS of E. albertii O4, which, to our knowledge, is unique among known bacterial polysaccharide structures: →2)-α-l-Rhap-(1 → 2)-α-l-Fucp-(1 → 2)-β-d-Galp-(1 → 3)-α-d-GalpNAc-(1 → 3)-β-d-GlcpNAc-(1→ The OPS structure of the strain of E...
June 17, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28667390/novel-psca-targeting-scfv-fusion-proteins-for-diagnosis-and-immunotherapy-of-prostate-cancer
#5
Claudia Kessler, Alessa Pardo, Mehmet K Tur, Stefan Gattenlöhner, Rainer Fischer, Katharina Kolberg, Stefan Barth
PURPOSE: Despite great progress in the diagnosis and treatment of localized prostate cancer (PCa), there remains a need for new diagnostic markers that can accurately distinguish indolent and aggressive variants. One promising approach is the antibody-based targeting of prostate stem cell antigen (PSCA), which is frequently overexpressed in PCa. Here, we show the construction of a molecular imaging probe comprising a humanized scFv fragment recognizing PSCA genetically fused to an engineered version of the human DNA repair enzyme O6-alkylguanine-DNA alkyltransferase (AGT), the SNAP-tag, enabling specific covalent coupling to various fluorophores for diagnosis of PCa...
June 30, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28666913/clinical-and-molecular-prognostic-factors-for-long-term-survival-of-the-patients-with-glioblastomas-in-a-single-institutional-consecutive-cohort
#6
Yu Nakagawa, Hikaru Sasaki, Kentaro Ohara, Taketo Ezaki, Masahiro Toda, Takayuki Ohira, Takeshi Kawase, Kazunari Yoshida
OBJECTIVE: The purpose of this study was to clarify the clinical and molecular characteristics associated with long-term survival in patients with glioblastoma. METHODS: We analyzed the characteristics of 96 glioblastoma patients. Long-term survivors (LTSs) were classified into moderate LTSs (mLTSs), who survived more than 3 years, and LTSs survived more than 5 years, and compared with short-term survivors (STSs). Clinical and molecular factors were investigated...
June 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28660878/jahn-teller-distortion-driven-magnetic-polarons-in-magnetite
#7
H Y Huang, Z Y Chen, R-P Wang, F M F de Groot, W B Wu, J Okamoto, A Chainani, A Singh, Z-Y Li, J-S Zhou, H-T Jeng, G Y Guo, Je-Geun Park, L H Tjeng, C T Chen, D J Huang
The first known magnetic mineral, magnetite, has unusual properties, which have fascinated mankind for centuries; it undergoes the Verwey transition around 120 K with an abrupt change in structure and electrical conductivity. The mechanism of the Verwey transition, however, remains contentious. Here we use resonant inelastic X-ray scattering over a wide temperature range across the Verwey transition to identify and separate out the magnetic excitations derived from nominal Fe(2+) and Fe(3+) states. Comparison of the experimental results with crystal-field multiplet calculations shows that the spin-orbital dd excitons of the Fe(2+) sites arise from a tetragonal Jahn-Teller active polaronic distortion of the Fe(2+)O6 octahedra...
June 29, 2017: Nature Communications
https://www.readbyqxmd.com/read/28654813/conformational-flexibility-and-base-pairing-tendency-of-the-tobacco-carcinogen-o6-4-oxo-4-3-pyridyl-butyl-guanine
#8
Katie A Wilson, Kariann G Szemethy, Stacey D Wetmore
The present work uses DFT calculations to characterize the conformational and hydrogen-bonding properties of O6-[4-oxo-4-(3-pyridyl)butyl]guanine (POB-G), a DNA adduct caused by tobacco. POB-G is found to adopt many isoenergetic conformations that allow for discrete interactions between the bulky moiety and the adducted G and/or pairing base. The calculated structure and stability of the hydrogen-bonded pairs between the Watson-Crick or Hoogsteen face of POB-G and the canonical DNA nucleobases fully rationalize the previously reported mutational spectra...
June 10, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28650392/o6-methylguanine-dna-methyltransferase-status-does-not-predict-response-or-resistance-to-alkylating-agents-in-well-differentiated-pancreatic-neuroendocrine-tumors
#9
Nitya Raj, David S Klimstra, Natally Horvat, Liying Zhang, Joanne F Chou, Marinela Capanu, Olca Basturk, Richard Kinh Gian Do, Peter J Allen, Diane Reidy-Lagunes
OBJECTIVES: Alkylating agents have activity in well-differentiated pancreatic neuroendocrine tumors (WD panNETs). In glioblastoma multiforme, decreased activity of O-methylguanine DNA methyltransferase (MGMT) predicts response; in panNETs, MGMT relevance is unknown. METHODS: We identified patients with WD panNETs treated with alkylating agents, determined best overall response by Response Evaluation Criteria In Solid Tumors (RECIST) 1.1, and performed MGMT activity testing...
June 22, 2017: Pancreas
https://www.readbyqxmd.com/read/28643947/effect-of-tet1-regulating-mgmt-on-chemotherapy-resistance-of-oral-squamous-cell-carcinoma-stem-cells
#10
Wei Wang, Xin Li, Fan Wang, Xiang-Yu Sun
The study was to evaluate the effect of ten-eleven translocation 1 (TET1) regulating o6-methylguanine-DNA methyltransferase (MGMT) in chemotherapy resistance of oral squamous cell carcinoma (OSCC) stem cells. OSCC stem cells were divided into the blank, negative control (NC), TET1-siRNA, TET1-siRNA + MGMT-OE and MGMT-OE groups. Methylation-specific polymerase chain reaction (MSP), qRT-PCR and western blotting were conducted to detect the methylation status of MGMT, expressions of TET1, MGMT, ABCG2 and Oct-4...
June 23, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28640605/high-pressure-synthesis-crystal-structure-and-magnetic-and-transport-properties-of-a-six-layered-srrho3
#11
Yan Li, Jinguang Cheng, José Antonio Alonso, John B Goodenough, Jianshi Zhou
A SrRhO3 polytype with six-layered (6M) structure was synthesized under high pressure and high temperature. The crystal structure was obtained by refining X-ray powder diffraction with the monoclinic space group C2/c with lattice parameters a = 5.5650(1) Å, b = 9.5967(2) Å, c = 14.0224(4) Å, and β = 92.846(2)°. It is isostructural with SrIrO3 synthesized under ambient pressure and consists of dimers of the face-shared Rh(2)O6 octahedra connected by their vertices to the corner-shared Rh(1)O6 octahedra along the c axis with a stacking of SrO3 layers in the sequence of CCHCCH, where C and H denote cubic and hexagonal closed packing, respectively...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28632960/snap-tag-based-subcellular-proteins-labeling-and-fluorescent-imaging-with-naphthalimides
#12
Chao Wang, Xinbo Song, Yi Xiao
Genetically encoded technologies provide methods for specific labeling and imaging of proteins, which is essential for the understanding of their subcellular localization and function. Herein, we employ naphthalimide, an efficient two-photon fluorophore, to develop O6-benzylguanine (BG) derivatives for specific labeling of subcellular proteins and fluorescent imaging through the SNAP-tag. The three naphthalimide-BG derivatives, TNI-BG, QNI-BG and ONI-BG are conveniently synthesized through modular "click chemistry" with high yields...
June 20, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28631925/anticancer-activity-of-polyoxometalate-bisphosphonate-complexes-synthesis-characterization-in-vitro-and-in-vivo-results
#13
Amandine Boulmier, Xinxin Feng, Olivier Oms, Pierre Mialane, Eric Rivière, Christopher J Shin, Jiaqi Yao, Tadahiko Kubo, Taisuke Furuta, Eric Oldfield, Anne Dolbecq
We synthesized a series of polyoxometalate-bisphosphonate complexes containing Mo(VI)O6 octahedra, zoledronate, or an N-alkyl (n-C6 or n-C8) zoledronate analogue, and in two cases, Mn as a heterometal. Mo6L2 (L = Zol, ZolC6, ZolC8) and Mo4L2Mn (L = Zol, ZolC8) were characterized by using single-crystal X-ray crystallography and/or IR spectroscopy, elemental and energy dispersive X-ray analysis and (31)P NMR. We found promising activity against human nonsmall cell lung cancer (NCI-H460) cells with IC50 values for growth inhibition of ∼5 μM per bisphosphonate ligand...
July 3, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28609363/o6-methylguanine-dna-methyltransferase-status-does-not-predict-response-or-resistance-to-alkylating-agents-in-well-differentiated-pancreatic-neuroendocrine-tumors
#14
Nitya Raj, David S Klimstra, Natally Horvat, Liying Zhang, Joanne F Chou, Marinela Capanu, Olca Basturk, Richard Kinh Gian Do, Peter J Allen, Diane Reidy-Lagunes
OBJECTIVES: Alkylating agents have activity in well-differentiated pancreatic neuroendocrine tumors (WD panNETs). In glioblastoma multiforme, decreased activity of O-methylguanine DNA methyltransferase (MGMT) predicts response; in panNETs, MGMT relevance is unknown. METHODS: We identified patients with WD panNETs treated with alkylating agents, determined best overall response by Response Evaluation Criteria In Solid Tumors (RECIST) 1.1, and performed MGMT activity testing...
July 2017: Pancreas
https://www.readbyqxmd.com/read/28602885/high-expression-of-glypican-1-predicts-dissemination-and-poor-prognosis-in-glioblastomas
#15
Taiichi Saito, Kazuhiko Sugiyama, Seiji Hama, Fumiyuki Yamasaki, Takeshi Takayasu, Ryo Nosaka, Shumpei Onishi, Yoshihiro Muragaki, Takakazu Kawamata, Kaoru Kurisu
OBJECTIVE: Glioblastoma (GBM) relapses locally or in a disseminated pattern, and is highly resistant to chemo-radiotherapy. Although dissemination is associated with poor prognosis for GBM patients, the clinico-pathological factors that promote dissemination have not been elucidated. Glypican-1 (GPC-1) is a heparin sulfate proteoglycan that is attached to the extracytoplasmic surface of the cell membrane and regulates cell motility. The aim of this study was to determine whether GPC-1 expression correlated with GBM dissemination and patient prognosis...
June 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28602417/survival-outcomes-with-short-course-radiation-therapy-in-elderly-patients-with-glioblastoma-data-from-a-randomized-phase-3-trial
#16
Douglas Guedes de Castro, Juliana Matiello, Wilson Roa, Sunita Ghosh, Lucyna Kepka, Narendra Kumar, Valery Sinaika, Darejan Lomidze, Dalenda Hentati, Eduardo Rosenblatt, Elena Fidarova
PURPOSE: To perform a subset analysis of survival outcomes in elderly patients with glioblastoma from a randomized phase 3 trial comparing 2 short-course radiation therapy (RT) regimens in elderly and/or frail patients. METHODS AND MATERIALS: The original trial population included elderly and/or frail patients with a diagnosis of glioblastoma. Patients joined the phase 3, randomized, multicenter, prospective, noninferiority trial; were assigned to 1 of 2 groups in a 1:1 ratio, either short-course RT (25 Gy in 5 fractions, arm 1) or commonly used RT (40 Gy in 15 fractions, arm 2); and were stratified by age (<65 years and ≥65 years), Karnofsky Performance Status (KPS), and extent of surgery...
July 15, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28594901/detection-of-human-cytomegalovirus-in-glioblastoma-among-taiwanese-subjects
#17
Ching-Fen Yang, Hsiang-Ling Ho, Shih-Chieh Lin, Chih-Yi Hsu, Donald Ming-Tak Ho
The relationship between human cytomegalovirus (HCMV) and glioblastoma (GBM) has been debated for more than a decade. We investigated the presence of HCMV genes, RNA and protein in GBMs and their relationships with tumor progression. Results of quantitative PCR for HCMV UL73, nested PCR for HCMV UL144, in situ hybridization (ISH) for RNA transcript, and immunohistochemistry (IHC) for protein expression and their relationship to the prognosis of 116 patients with GBM were evaluated. Nine (7.8%) cases revealed a low concentration of HCMV UL73, and only 2 of the 9 (1...
2017: PloS One
https://www.readbyqxmd.com/read/28594893/pandemic-extra-intestinal-pathogenic-escherichia-coli-expec-clonal-group-o6-b2-st73-as-a-cause-of-avian-colibacillosis-in-brazil
#18
Marcos Paulo Vieira Cunha, Andre Becker Saidenberg, Andrea Micke Moreno, Antonio José Piantino Ferreira, Mônica Aparecida Midolli Vieira, Tânia Aparecida Tardelli Gomes, Terezinha Knöbl
Extra-intestinal pathogenic Escherichia coli (ExPEC) represent an emerging pathogen, with pandemic strains increasingly involved in cases of urinary tract infections (UTIs), bacteremia, and meningitis. In addition to affecting humans, the avian pathotype of ExPEC, avian pathogenic E. coli (APEC), causes severe economic losses to the poultry industry. Several studies have revealed overlapping characteristics between APEC and human ExPEC, leading to the hypothesis of a zoonotic potential of poultry strains. However, the description of certain important pandemic clones, such as Sequence Type 73 (ST73), has not been reported in food sources...
2017: PloS One
https://www.readbyqxmd.com/read/28591780/position-dependent-effects-of-regioisomeric-methylated-adenine-and-guanine-ribonucleosides-on-translation
#19
Changjun You, Xiaoxia Dai, Yinsheng Wang
Reversible methylation of the N6 or N1 position of adenine in RNA has recently been shown to play significant roles in regulating the functions of RNA. RNA can also be alkylated upon exposure to endogenous and exogenous alkylating agents. Here we examined how regio-specific methylation at the hydrogen bonding edge of adenine and guanine in mRNA affects translation. When situated at the third codon position, the methylated nucleosides did not compromise the speed or accuracy of translation under most circumstances...
June 7, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28590111/synthesis-of-water-dispersible-single-layer-coal-carbonate-layered-double-hydroxide
#20
Haiping Li, Thanh-Nhan Tran, Byong-Jun Lee, Chunfei Zhang, Jong-Deok Park, Tong-Hyun Kang, Jong-Sung Yu
Despite extensive study on single-layer layered double hydroxides (SL-LDHs) with NO3(-) counterions, SL-LDHs with CO3(2-) counterions (CO3(2-) SL-LDHs) have never been prepared before. Herein, a CoAl-CO3(2-) SL-LDH which stays stable in water and powdery state is first synthesized using ethylene glycol as a reaction medium. The SL-LDH, with thickness of ∼0.85 nm, is composed of one Co(Al)O6 layer sandwiched between two CO3(2-) layers. The SL-LDH powder shows high specific surface area (∼289 m(2)/g) and excellent electrocatalytic oxygen evolution efficiency...
June 21, 2017: ACS Applied Materials & Interfaces
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