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https://www.readbyqxmd.com/read/29786742/a-novel-alendronate-functionalized-nanoprobe-for-simple-colorimetric-detection-of-cancer-associated-hypercalcemia
#1
Abhishek Sahu, Youngmin Hwang, Cristian Vilos, Jong-Min Lim, Sunghyun Kim, Won Il Choi, Giyoong Tae
The calcium (Ca2+) ion concentration in the blood serum is tightly regulated, and any abnormalities in the level of serum calcium ions are associated with many potentially dangerous diseases. Thus, monitoring of the Ca2+ ion concentration in the blood serum is of fundamental importance. Gold nanoparticle (GNP)-based colorimetric biosensors have enormous potential in clinical diagnostic applications due to their simplicity, versatility, and unique optical properties. In this study, we have developed an alendronate functionalized gold nanoparticle (GNP-ALD) system for the measurement of Ca2+ ion concentration in biological samples...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786615/morphological-control-of-gold-nanorods-via-thermally-driven-bi-surfactant-growth-and-application-for-detection-of-heavy-metal-ions
#2
Hao Huang, Huiyi Li, Huaiyu Wang, Jia Li, Penghui Li, Qidan Chen, Yue Chen, Paul K Chu, Bo Li, Xuefeng Yu
We report a modified synthesis route of colloidal gold nanorods (AuNRs) by combining the thermal re-shaping treatment and bi-surfactant modification using hexadecyltrimethylammonium bromide (CTAB) and sodium oleate (NaOL). Aspect ratios down to 1.3 ± 0.1 can be achieved in addition to good monodispersity, uniformity, and chemical stability of the materials. Furthermore, without needing post-treatment, metal ions directly interact with the AuNRs efficiently, allowing rapid and sensitive colorimetric detection of heavy metal ions such as Pb<sup>2+</sup> and Cu<sup>2+</sup> with a low concentration down to 2...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29785135/mutation-analysis-of-brca1-2-mutations-with-special-reference-to-polymorphic-snps-in-indian-breast-cancer-patients
#3
Nidhi D Shah, Parth S Shah, Yash Y Panchal, Kalpesh H Katudia, Nikunj B Khatri, Hari Shankar P Ray, Upti R Bhatiya, Sandip C Shah, Bhavini S Shah, Mandava V Rao
Background: Germline mutations BRCA1 and BRCA2 contribute almost equally in the causation of breast cancer (BC). The type of mutations in the Indian population that cause this condition is largely unknown. Purpose: In this cohort, 79 randomized BC patients were screened for various types of BRCA1 and BRCA2 mutations including frameshift, nonsense, missense, in-frame and splice site types. Materials and methods: The purified extracted DNA of each referral patient was subjected to Sanger gene sequencing using Codon Code Analyzer and Mutation Surveyor and next-generation sequencing (NGS) methods with Ion torrent software, after appropriate care...
2018: Application of Clinical Genetics
https://www.readbyqxmd.com/read/29781764/charged-iron-particles-found-in-galactic-cosmic-rays-are-potent-inducers-of-epithelial-ovarian-tumors
#4
Birendra Mishra, Gregory W Lawson, Ryan Ripperdan, Laura Ortiz, Ulrike Luderer
Astronauts traveling in deep space are exposed to high-charge and energy (HZE) particles from galactic cosmic rays. We have previously determined that irradiation of adult female mice with iron HZE particles induces DNA double-strand breaks, oxidative damage and apoptosis in ovarian follicles, causing premature ovarian failure. These effects occur at lower doses than with conventional photon irradiation. Ovarian failure with resultant loss of negative feedback and elevated levels of gonadotropin hormones is thought to play a role in the pathophysiology of ovarian cancer...
May 21, 2018: Radiation Research
https://www.readbyqxmd.com/read/29780533/a-halogen-bond-mediated-highly-active-artificial-chloride-channel-with-high-anticancer-activity
#5
Changliang Ren, Xin Ding, Arundhati Roy, Jie Shen, Shaoyuan Zhou, Feng Chen, Sam Fong Yau Li, Haisheng Ren, Yi Yan Yang, Huaqiang Zeng
Chloride-selective transmembrane carriers or channels might have possible uses in treating channelopathies or cancers. While chloride carriers have been extensively investigated, the corresponding chloride channels have remained limitedly studied. Moreover, all hitherto reported channel systems lack clearly definable and readily modifiable positions in their structures for the reliable construction and combinatorial optimization of their ion transport properties. As a result, the existing channels are limited by their large molecular weight, weak activity or low anion selectivity...
May 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29776851/treatment-planning-dose-accuracy-improvement-in-the-presence-of-dental-implants
#6
Holly M Parenica, John R Ford, Panayiotis Mavroidis, Ying Li, Nikos Papanikolaou, Sotirios Stathakis
Streaking artifacts in computed tomography (CT) scans caused by metallic dental implants (MDIs) can lead to inaccuracies in dose calculations. This study quantifies and compares the effect of MDIs on dose distributions using the collapsed cone convolution superposition (CCCS) and Monte Carlo (MC) algorithms, with and without correcting for the density of the MDIs. Ion chamber measurements were taken to test the ability of the algorithms in Pinnacle3 and Monaco to calculate dose near high-Z materials. Nine previously treated patients with head and neck cancer were included in this study...
May 15, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29776024/simple-and-universal-model-for-electron-impact-ionization-of-complex-biomolecules
#7
Hong Qi Tan, Zhaohong Mi, Andrew A Bettiol
We present a simple and universal approach to calculate the total ionization cross section (TICS) for electron impact ionization in DNA bases and other biomaterials in the condensed phase. Evaluating the electron impact TICS plays a vital role in ion-beam radiobiology simulation at the cellular level, as secondary electrons are the main cause of DNA damage in particle cancer therapy. Our method is based on extending the dielectric formalism. The calculated results agree well with experimental data and show a good comparison with other theoretical calculations...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775813/hyaluronate-lactoferrin-layer-by-layer-coated-lipid-nanocarriers-for-targeted-co-delivery-of-rapamycin-and-berberine-to-lung-carcinoma
#8
Dalia M Kabary, Maged W Helmy, Kadria A Elkhodairy, Jia-You Fang, Ahmed O Elzoghby
The self-tumor targeting polymers, lactoferrin (LF) and hyaluronic acid (HA) were utilized to develop layer-by-layer (LbL) lipid nanoparticles (NPs) for dual delivery of berberine (BER) and rapamycin (RAP) to lung cancer. To control its release from the NPs, BER was hydrophobically ion paired with SLS prior to incorporation into NPs. Spherical HA/LF-LbL-RAP-BER/SLS-NPs 250.5 nm in diameter, with a surface charge of -18.5 mV were successfully elaborated. The NPs exhibited sequential release pattern with faster release of BER followed by controlled release of RAP which enables sensitization of lung tumor cells to the anti-cancer action of RAP...
May 15, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29775292/entropy-as-a-driver-of-selectivity-for-inhibitor-binding-to-histone-deacetylase-6
#9
Nicholas J Porter, Florence F Wagner, David W Christianson
Among the metal-dependent histone deacetylases, the class IIb isozyme HDAC6 is remarkable because of its role in the regulation of microtubule dynamics in the cytosol. Selective inhibition of HDAC6 results in microtubule hyperacetylation, leading to cell cycle arrest and apoptosis, which is a validated strategy for cancer chemotherapy and the treatment of other disorders. HDAC6 inhibitors generally consist of a Zn2+ -binding group such as a hydroxamate, a linker, and a capping group; the capping group is a critical determinant of isozyme selectivity...
May 18, 2018: Biochemistry
https://www.readbyqxmd.com/read/29774753/zn-2-loaded-cellulose-beads-stabilized-by-chitosan-and-prepared-via-freeze-drying-for-removing-human-testosterone-in-plasma
#10
Huibin Yu, Hongqin Ke, Tu Chen, Xing Li, Shenglong Tan, Lei Zhou, Shenqi Wang
Hemoperfusion using metal ion affinity adsorbent is a promising method to remove human testosterone in plasma. Due to the leakage of metal ion from the adsorbents, there is no metal ion affinity adsorbent for hemoperfusion. In this study, chitosan was used to coat the adsorbent for preventing the leakage of Zn2+ loaded. Meanwhile, freeze-drying method was used to enhance adsorption capacity of Zn2+ -loaded cellulose beads for testosterone. The results indicate that after the adsorbent was coated by 0.02% chitosan solution, the highest adsorption percentage reached 48%, during adsorption, the Zn2+ concentration in plasma did not increase; the adsorption capacity of the adsorbent can be significantly enhanced by freeze-drying...
May 18, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29772843/the-role-of-trp-channels-in-the-metastatic-cascade
#11
REVIEW
Benedikt Fels, Etmar Bulk, Zoltán Pethő, Albrecht Schwab
A dysregulated cellular Ca2+ homeostasis is involved in multiple pathologies including cancer. Changes in Ca2+ signaling caused by altered fluxes through ion channels and transporters (the transportome) are involved in all steps of the metastatic cascade. Cancer cells thereby "re-program" and "misuse" the cellular transportome to regulate proliferation, apoptosis, metabolism, growth factor signaling, migration and invasion. Cancer cells use their transportome to cope with diverse environmental challenges during the metastatic cascade, like hypoxic, acidic and mechanical cues...
May 17, 2018: Pharmaceuticals
https://www.readbyqxmd.com/read/29764582/-research-advances-in-the-role-of-aptamers-in-the-diagnosis-and-targeted-therapy-of-pediatric-cancer
#12
Yi-Bin Zhang, Yan-Peng Wang, Jing Liu
Aptamers are single-stranded DNA or RNA which are isolated from synthesized random oligonucleotide library in vitro via systematic evolution of ligands by exponential enrichment (SELEX) and can bind to metal ions, small molecules, carbohydrates, lipids, proteins, and others targets with high affinity and specificity. Aptamers have the advantages of simple preparation, good thermal stability, and low immunogenicity and have great potential in the medical fields such as molecular imaging, biosensing, early diagnosis of diseases, and targeted therapy...
May 2018: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/29762138/theranostic-gold-magnetite-hybrid-nanoparticles-for-mri-guided-radiosensitization
#13
Devid Maniglio, Filippo Benetti, Luca Minati, Jorge Jovicich, Aldo Valentini, G Speranza, Claudio Migliaresi
The main limitation of drug-enhanced radiotherapy concerns the difficulty to evaluate the effectiveness of cancer targeting after drug administration hindering the standardization of therapies based on current radiosensitizing compounds. The challenge regards the development of systems able to combine imaging and radiotherapy enhancement in order to perform highly reliable cancer theragnosis. For these reasons, gold-magnetite hybrid nanoparticles are proposed as innovative theranostic nanotools for imaging-guided radiosensitization in cancer treatment...
May 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29760807/quality-control-of-next-generation-sequencing-based-in-vitro-diagnostic-test-for-onco-relevant-mutations-using-multiplex-reference-materials-in-plasma
#14
Donglai Liu, Haiwei Zhou, Dawei Shi, Shu Shen, Yabin Tian, Lin Wang, Jiatao Lou, Rong Cong, Juan Lu, Henghui Zhang, Meiru Zhao, Shida Zhu, Zhisheng Cao, Ruilin Jin, Yin Wang, Xiaoni Zhang, Guohua Yang, Youchun Wang, Chuntao Zhang
Background: Widespread clinical implementation of next-generation sequencing (NGS)-based cancer in vitro diagnostic tests (IVDs) highlighted the urgency to establish reference materials which could provide full control of the process from nucleic acid extraction to test report generation. The formalin-fixed, paraffin-embedded (FFPE) tissue and blood plasma containing circulating tumor deoxyribonucleic acid (ctDNA) were mostly used for clinically detecting onco-relevant mutations. Methods: We respectively developed multiplex FFPE and plasma reference materials covering three clinically onco-relevant mutations within the epidermal growth factor receptor ( EGFR ) gene at serial allelic frequencies...
2018: Journal of Cancer
https://www.readbyqxmd.com/read/29757629/signature-of-antibody-domain-exchange-by-native-mass-spectrometry-and-collision-induced-unfolding
#15
Yasunori Watanabe, Snezana Vasiljevic, Joel D Allen, Gemma E Seabright, Helen Duyvesteyn, Katie J Doores, Max Crispin, Weston B Struwe
The development of domain-exchanged antibodies offers a route to high affinity targeting to clustered multivalent epitopes, such as those associated with viral infections and many cancers. One strategy to generate these antibodies is to introduce mutations into target antibodies to drive domain-exchange using the only known naturally-occurring domain-exchanged anti-HIV IgG1 antibody 2G12, as a template. Here, we show that domain-exchange can be sensitively monitored by ion-mobility mass spectrometry and gas-phase collision induced unfolding...
May 14, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29757472/technical-note-predicting-dose-distribution-with-replacing-stopping-power-ratio-for-inter-fractional-motion-and-intra-fractional-motion-during-carbon-ion-radiotherapy-with-passive-irradiation-method-for-stage-i-lung-cancer
#16
Yoshiki Kubota, Makoto Sakai, Mutsumi Tashiro, Jun-Ichi Saitoh, Takanori Abe, Tatsuya Ohno, Takashi Nakano
PURPOSE: We designed and evaluated a simple method for predicting the effects of intra-fractional and/or inter-fractional motion on dose distribution during carbon ion radiotherapy (CIRT) for solitary-lesion stage I lung cancer. METHODS: The proposed method uses computed tomography (CT) images from treatment planning and intra-tumoral and/or inter-tumoral displacement. The predicted dose distribution (PDD) was calculated by replacing the current tumor region with the stopping power ratio (SPR) of the lung, and replacing the moved tumor region with the SPR of the tumor...
May 14, 2018: Medical Physics
https://www.readbyqxmd.com/read/29755687/clinical-application-of-targeted-next-generation-sequencing-for-colorectal-cancer-patients-a-multicentric-belgian-experience
#17
Nicky D'Haene, Quitterie Fontanges, Nancy De Nève, Oriane Blanchard, Barbara Melendez, Monique Delos, Marie-Françoise Dehou, Calliope Maris, Nathalie Nagy, Emmanuel Rousseau, Josse Vandenhove, André Gilles, Carine De Prez, Laurine Verset, Marie-Paule Van Craynest, Pieter Demetter, Jean-Luc Van Laethem, Isabelle Salmon, Marie Le Mercier
International guidelines made RAS (KRAS and NRAS) status a prerequisite for the use of anti-EGFR agents for metastatic colorectal cancer (CRC) patients. Daily, new data emerges on the theranostic and prognostic role of molecular biomarkers; this is a strong incentive for a validated, sensitive, and broadly available molecular screening test. Next-generation sequencing (NGS) has begun to supplant other technologies for genomic profiling. We report here our 2 years of clinical practice using NGS results to guide therapeutic decisions...
April 17, 2018: Oncotarget
https://www.readbyqxmd.com/read/29754052/detection-of-parp-1-activity-based-on-hyperbranched-poly-adp-ribose-polymers-responsive-current-in-artificial-nanochannels
#18
Yong Liu, Jiahui Fan, Haitang Yang, Ensheng Xu, Wei Wei, Yuanjian Zhang, Songqin Liu
The cellular enzyme poly ADP (ADP: adenosine diphosphate)-ribose polymerase-1 (PARP-1) plays key roles in DNA repair. Its activity is closely related to various cancer developments. Detection of PARP-1 activity is significant, however, it is relatively difficult since it lacks superiority property that can be used to detect conveniently. PARP-1 lead to the synthesis of hyperbranched poly (ADP-ribose) polymers (PAR) using nicotinamide adenine dinucleotide (NAD+ ) as substrate during DNA damage repairing. In this paper, we found that hyper-branched PAR increased the steric hindrance and reduced the flux of probe ions effectively in anodic aluminum oxide (AAO) nanochannels...
May 4, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29752895/adaptation-of-an-amplicon-based-human-cancer-next-generation-sequencing-panel-assay-for-murine-tumors
#19
David R Meier, Kristopher A Lofgren, Grzegorz T Gurda, Paraic A Kenny
Unlike humans, inbred genetically engineered mice have minimal inter-individual variation and, consequently, offer substantially increased statistical power for robust definition of recurrent cooperating cancer mutations. While technically feasible, whole exome sequencing is expensive and extremely data-intensive. Somatic mutation analysis using panels of 25-75 genes now provides detailed insight into the biology of human tumors. Here we report an adaptation for mouse tumors of a human PCR amplicon-based panel (Ion Torrent Cancer Hotspot Panel v2) allowing analysis of 18 cancer genes, including Kras, Nras, Hras, Pten, Pik3ca and Smad4, and encompassing regions homologous to more than 2000 known human cancer mutations...
May 9, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29752272/functional-profiling-and-crystal-structures-of-isothiocyanate-hydrolases-found-in-gut-associated-and-plant-pathogenic-bacteria
#20
Tijs J M van den Bosch, Kemin Tan, Andrzej Joachimiak, Cornelia U Welte
Isothiocyanates (ITCs) are produced by cruciferous plants to protect them against herbivores and infection by microbes. These compounds are of particular interest due to their antimicrobial and anticarcinogenic properties. The breakdown of ITCs in nature is catalyzed by isothiocyanate hydrolase (ITCase), a novel family within the metallo-β-lactamase-fold superfamily of proteins. saxA genes that code for ITCases are particularly widespread in insect- and plant-associated bacteria. Enzymatic characterization of seven phylogenetically related but distinct ITCases exhibited similar activities on six selected ITCs, suggesting that phylogenetic diversity does not determine the substrate specificity of ITCases...
May 11, 2018: Applied and Environmental Microbiology
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