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https://www.readbyqxmd.com/read/29788948/genechip-analysis-of-resistant-mycobacterium-tuberculosis-with-previously-treated-tuberculosis-in-changchun
#1
Ming-Jin Zhang, Wen-Zhi Ren, Xue-Juan Sun, Yang Liu, Ke-Wei Liu, Zhong-Hao Ji, Wei Gao, Bao Yuan
BACKGROUND: With the widespread use of rifampicin and isoniazid, bacterial resistance has become a growing problem. Additionally, the lack of relevant baseline information for the frequency of drug-resistant tuberculosis (TB) gene mutations is a critical issue, and the incidence of this infection in the city of Changchun has not investigated to date. However, compared with the slow traditional methods of drug susceptibility testing, recently developed detection methods, such as rifampicin and isoniazid resistance-related gene chip techniques, allow for rapid, easy detection and simultaneous testing for mutation frequency and drug resistance...
May 22, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29777330/down-regulating-il-6-gp130-targets-improved-the-anti-tumor-effects-of-5-fluorouracil-in-colon-cancer
#2
Sanhong Li, Jilai Tian, Hongming Zhang, Shoubing Zhou, Xiyong Wang, Lei Zhang, Jiapeng Yang, Zhigang Zhang, Zhenling Ji
Recent studies have confirmed that IL-6/GP130 targets are closely associated with tumor growth, metastasis and drug resistance. 5-Fluorouracil (5-FU) is the most common chemotherapeutic agent for colon cancer but is limited due to chemoresistance and high cytotoxicity. Bazedoxifene (BZA), a third-generation selective estrogen receptor modulator, was discovered by multiple ligand simultaneous docking and drug repositioning approaches to have a novel function as an IL-6/GP130 target inhibitor. Thus, we speculated that in colon cancer, the anti-tumor efficacy of 5-FU might be increased in combination with IL-6/GP130 inhibitors...
May 18, 2018: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/29775840/development-of-a-lc-ms-method-for-simultaneous-determination-of-amoxicillin-and-metronidazole-in-human-serum-using-hydrophilic-interaction-chromatography-hilic
#3
Udani L Kathriarachchi, Sagar S Vidhate, Naser Al-Tannak, Alison H Thomson, Michael J J da Silva Neto, David G Watson
A method was developed for the determination of amoxicillin and metronidazole in human serum. The procedure used was hydrophilic interaction chromatography (HILIC) followed by mass spectrometric (MS) detection. Chromatographic separation was achieved on a ZIC-HILIC column and the mobile phase consisted of a mixture of 0.1% (v/v) formic acid in water and 0.1% (v/v) formic acid in acetonitrile. The method was validated with regard to selectivity, accuracy, precision, calibration, lower limit of quantification (LOQ), extraction recovery and matrix effect...
May 15, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29769480/5-hydroxy-4-nitro-7-propionyloxy-genistein-inhibited-invasion-and-metastasis-via-inactivating-wnt-b-catenin-signal-pathway-in-human-endometrial-carcinoma-ji-endometrial-cells
#4
Jun Bai, Xin Luo
BACKGROUND Chemotherapy has been assuring more important roles in the treatment of carcinoma. Developing new types of drugs with less adverse effects and low drug resistance has become an important researching focus. The present study aimed to investigate the anticancer effects of 5-hydroxy-4'-nitro-7-propionyloxy-genistein (HNPG) and to elucidate its underlying molecular mechanism. MATERIAL AND METHODS The inhibitory effects of cell viability of HNPG were detected using 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) assay, flat plate clone formation method, and Transwell assay...
May 17, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29768700/cell-and-tissue-based-proteome-profiling-and-dual-imaging-of-apoptosis-markers-with-probes-derived-from-venetoclax-and-idasanutlin
#5
Zhengqiu Li, Dongsheng Zhu, Haijun Guo, Yu Chang, Yun Ni, Lin Li, Piliang Hao, Yong Xu, Ke Ding
Venetoclax (ABT-199) and idasanutlin (RG7388) are efficient anticancer drugs targeting two essential apoptosis markers, Bcl2 and MDM2, respectively. Recent studies have shown that the combination of these two drugs leads to remarkable enhancement of anticancer efficacy, both in vitro and in vivo. In an attempt to understand the mechanism of this synergistic effect, competitive affinity-based proteome profiling coupled with bioimaging was employed to characterize their protein targets in the same cancer cell line and tumor tissue...
May 16, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29767952/laser-cleavable-probes-based-cell-surface-engineering-for-in-situ-sialoglycoconjugates-profiling-by-ldi-mass-spectrometry
#6
Jie Sun, Huihui Liu, Lingpeng Zhan, Caiqiao Xiong, Xi Huang, Jinjuan Xue, Zongxiu Nie
Cell-surface sialoglycoconjugates (sialoglycoproteins & sialoglycolipids) play important roles in cell-cell interactions and related tumor metastasis process. Although there have been some analytical methods to evaluate the sialoglycoconjugates, an effective method providing both qualitative and quantitative information is still deficient. Here we establish an extraction-free, sensitive and high-throughput platform to realize in-situ detection of the cell-surface sialoglycoconjugates on various cell lines, e...
May 16, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29766324/a-general-lc-ms-ms-method-for-monitoring-potential-%C3%AE-lactam-contamination-in-drugs-and-drug-manufacturing-surfaces
#7
Chen Qiu, Hongbin Zhu, Connie Ruzicka, David Keire, Hongping Ye
Penicillins and some non-penicillin β-lactams may cause potentially life-threatening allergic reactions. Thus, possible cross contamination of β-lactams in food or drugs can put people at risk. Therefore, when there is a reasonable possibility that a non-penicillin product could be contaminated by penicillin, the drug products are tested for penicillin contamination. Here, a sensitive and rapid method for simultaneous determination of multiple β-lactam antibiotics using high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed and validated...
May 15, 2018: AAPS Journal
https://www.readbyqxmd.com/read/29764589/-influence-of-different-therapies-on-egfr-mutants-by-circulating-cell-free-dna-of-lung-adenocarcinoma-and-prognosis
#8
Fei Su, Ke Zheng, Yiyun Fu, Qian Wu, Yuan Tang, Weiya Wang, Lili Jiang
BACKGROUND: Epidermal growth factor receptor (EGFR) gene mutation is closely related to the EGFR-TKI target treatment and prognosis of lung adenocarcinoma patients. The mutation status of EGFR is limited by tissue detection. The purpose of this study was to investigate the difference of EGFR mutants in plasmacirculating cell-free DNA (cfDNA) obtained from patients with non-small cell lung cancer (NSCLC) in three groups: pre-therapy, after traditional chemotherapy and targeted therapy...
May 20, 2018: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/29762174/reasons-for-non-adherence-to-the-dapivirine-vaginal-ring-results-of-the-mtn-032-aha-study
#9
Elizabeth T Montgomery, Jonathan Stadler, Sarita Naidoo, Ariana Katz, Nicole Laborde, Morgan Garcia, Krishnaveni Reddy, Leila Mansoor, Juliane Etima, Chifundo Zimba, Miria Chitukuta, Lydia Soto-Torres
OBJECTIVE(S): METHODS:: Former ASPIRE participants were stratified by age group (18-21; 22-45) and randomly selected at seven sites in Malawi, South Africa, Uganda and Zimbabwe, 12-17 months after trial exit. Using in-depth interviews or focus group discussions, ring use barriers were explored using structured guides and visual tools including individual-level depictions of dapivirine levels detected in plasma and returned rings. RESULTS: 187 were enrolled; 37% were 18-21 when they began ASPIRE...
May 11, 2018: AIDS
https://www.readbyqxmd.com/read/29758468/overcoming-the-stability-solubility-and-extraction-challenges-in-reversed-phase-uhplc-ms-ms-bioanalysis-of-a-phosphate-drug-and-its-prodrug-in-blood-lysate
#10
Long Yuan, Shenita Basdeo, Qin C Ji
BMS-986104 is a S1P1 R modulator drug candidate under development and has been evaluated in Phase I clinical trials. BMS-986104 functions as a prodrug and undergoes enzymatic transformations in vivo to form the pharmacologically active phosphate drug, BMS-986104-P. Here, we report approaches to overcome the stability, solubility and extraction challenges in developing a sensitive, accurate and rugged LC-MS/MS method for the simultaneous quantification of the phosphate drug and its prodrug in blood lysate. An effective stabilization strategy using a cocktail of phosphatase and kinase inhibitors was developed to ensure the stability of both analytes during sample collection, storage, and processing...
May 5, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29757980/determination-of-ten-macrolide-drugs-in-environmental-water-using-molecularly-imprinted-solid-phase-extraction-coupled-with-liquid-chromatography-tandem-mass-spectrometry
#11
Xuqin Song, Tong Zhou, Jiufeng Li, Meiyu Zhang, Jingmeng Xie, Limin He
With the extensive application of antibiotics in livestock, their contamination of the aquatic environment has received more attention. Molecularly imprinted polymer (MIP), as an eco-friendly and durable solid-phase extraction material, has shown great potential for the separation and enrichment of antibiotics in water. This study aims at developing a practical and economical method based on molecularly imprinted solid phase extraction (MISPE) combined with liquid chromatography-tandem mass spectrometry (LC-MS/MS) for simultaneously detecting ten macrolide drugs in different sources of water samples...
May 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29755211/microfluidic-diatomite-analytical-devices-for-illicit-drug-sensing-with-ppb-level-sensitivity
#12
Xianming Kong, Xinyuan Chong, Kenny Squire, Alan X Wang
The escalating research interests in porous media microfluidics, such as microfluidic paper-based analytical devices, have fostered a new spectrum of biomedical devices for point-of-care (POC) diagnosis and biosensing. In this paper, we report microfluidic diatomite analytical devices (μDADs), which consist of highly porous photonic crystal biosilica channels, as an innovative lab-on-a-chip platform to detect illicit drugs. The μDADs in this work are fabricated by spin-coating and tape-stripping diatomaceous earth on regular glass slides with cross section of 400×30µm2 ...
April 15, 2018: Sensors and Actuators. B, Chemical
https://www.readbyqxmd.com/read/29754062/enantioselective-fractionation-of-fluoroquinolones-in-the-aqueous-environment-using-chiral-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#13
Erika Castrignanò, Andrew M Kannan, Edward J Feil, Barbara Kasprzyk-Hordern
This paper aims to examine the multiresidue enantiomeric profiling of (fluoro)quinolones and their metabolites in solid and liquid environmental matrices using chiral HPLC-MS/MS method and a CHIRALCEL® OZ-RH column. Simultaneous chiral separation was obtained for chiral ofloxacin and its main metabolites ofloxacin-N-oxide and desmethyl-ofloxacin; moxifloxacin; the prodrug prulifloxacin and its active compound ulifloxacin; flumequine; nadifloxacin and R-(+)-besifloxacin. Achiral antibiotics (ciprofloxacin, norfloxacin and nalidixic acid) were also included in the method to enable the analysis of all targeted quinolones within one analytical run...
May 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/29753282/efficient-hptlc-dual-wavelength-spectrodensitometric-method-for-simultaneous-determination-of-sofosbuvir-and-daclatasvir-biological-and-pharmaceutical-analysis
#14
Mohammad Nabil Abo-Zeid, Samia M El-Gizawy, Noha N Atia, Salwa R El-Shaboury
Sofosbuvir (SOF) and daclatasvir (DCS) are newly discovered anti-hepatitis C drugs that have direct antiviral activity. A novel and simple high-performance thin-layer chromatography (HPTLC) method was designed for simultaneous determination of SOF and DCS in miscellaneous matrices. The method adopts coupling HPTLC with dual wavelength spectrodensitometry. Consequently, this enabled sensitive, specific and cost-effective determination of the SOF-DCS mixture. The developed HPTLC procedure is based on a simple liquid-liquid extraction, enrichment of the analytes and subsequent chromatographic separation with UV detection...
May 1, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29746395/a-liquid-chromatography-mass-spectrometry-assay-for-determination-of-perampanel-and-concomitant-antiepileptic-drugs-in-the-plasma-of-patients-with-epilepsy-compared-with-a-fluorescent-hplc-assay
#15
Ugo de Grazia, Annachiara D'Urso, Federica Ranzato, Valentina De Riva, Giorgia Contarato, Giuseppe Billo, Francesco Perini, Elisabetta Galloni
BACKGROUND: Perampanel is a novel non-competitive selective antagonist at the postsynaptic ionotropic alpha-amino-3-hydroxy-5-methyl-4-isoxazoleproprionic acid (AMPA) glutamate receptor, approved as an adjunctive agent for the treatment of partial-onset seizure with or without secondary generalization and for primary generalized tonic-clonic seizure in patients with epilepsy who are at least 12 years of age. Limited information is available about the clinical utility of therapeutic drug monitoring of perampanel and therapeutic ranges are so far not established...
May 9, 2018: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29745740/co-delivery-of-gambogenic-acid-and-vegf-sirna-with-anionic-liposome-and-polyethylenimine-complexes-to-hepg2-cells
#16
Qiongfang Yu, Bian Zhang, Yali Zhou, Qin Ge, Chang Jiali, Yunna Chen, Kaiqi Zhang, Daiyin Peng, Weidong Chen
Background and Objective The combination of two or more different mechanisms of drugs in the treatment of cancer has become one of the effective methods. The purpose of this study was to successfully prepare a non-viral delivery system that could efficiently co-delivery siRNA and gambogenic acid (GNA) to improve the anti-cancer efficiency in HepG2 cells. Methods The delivery system was prepared by a two-step method. Firstly, the GNA anionic liposome took shape by a solvent evaporation method, and then the liposome was bound to the PEI/siRNA complex by electrostatic interaction to form the final carrier system (lipopolyplexes)...
May 10, 2018: Journal of Liposome Research
https://www.readbyqxmd.com/read/29745612/-local-helix-parameters-fitting-of-proteins-based-on-dual-quaternions-registration-method
#17
Yonghong Xu, Shaowei Zhang, Jun Jing, Yong Zhao, Feixiang Hou
A fitting method of calculating local helix parameters of proteins based on dual quaternions registration fitting (DQRFit) is proposed in this paper. First, the C and N atom coordinates of each residue in the protein structure data are extracted. Then the unregistered data and reference data are constructed using the sliding windows. The square sum of the distance of the data points before and after registration is regarded as an optimization goal. We calculate the optimal rotation matrix and the translation vector using the dual quaternion registration algorithm, and get the helix parameters of the secondary structure which contain the number of residues per turn( τ ), helix radius( ρ )and helix pitch( p )...
February 1, 2018: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29742414/simultaneous-detection-of-local-polarizability-and-viscosity-by-a-single-fluorescent-probe-in-cells
#18
Gerardo Abbandonato, Dario Polli, Daniele Viola, Giulio Cerullo, Barbara Storti, Francesco Cardarelli, Fabrizio Salomone, Riccardo Nifosì, Giovanni Signore, Ranieri Bizzarri
Many intracellular reactions are dependent on the dielectric ("polarity") and viscosity properties of their milieu. Fluorescence imaging offers a convenient strategy to report on such environmental properties. Yet, concomitant and independent monitoring of polarity and viscosity in cells at submicron scale is currently hampered by the lack of fluorescence probes characterized by unmixed responses to both parameters. Here, the peculiar photophysics of a green fluorescent protein chromophore analog is exploited for quantifying and imaging polarity and viscosity independently in living cells...
May 8, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29741867/tackling-poor-specificity-of-cocaine-color-tests-by-electrochemical-strategies
#19
Mats de Jong, Anca Florea, Joy Eliaerts, Filip Van Durme, Nele Samyn, Karolien De Wael
This paper presents electrochemical strategies for the fast screening of cocaine and most common cutting agents found in seized drug samples. First, a study on the performance of Scott color tests on cocaine and a wide range of cutting agents is described. The cutting agents causing false positive or false negative results when in mixture with cocaine are identified. To overcome the lack of specificity of color tests, we further propose a fast screening strategy by means of square wave voltammetry on disposable graphite screen printed electrodes, which reveals the unique fingerprint of cocaine and cutting agents...
May 9, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29739068/performance-evaluation-of-protein-chip-assay-for-rapid-diagnosis-of-hepatitis-c-virus-infection-in-injection-drug-abusers
#20
Zhiyan Dai, Xin Shu, Gang Li, Weidong Xi
BACKGROUND: We evaluated the performance of a protein chip assay for the detection of antibodies to hepatitis C virus (HCV) peptides among injection drug abusers (IDAs) by comparing the assay with existing methods, including enzyme-linked immunosorbent assay (ELISA), reverse transcription-polymerase chain reaction (RT-PCR), and recombinant immunoblot assay (RIBA). METHODS: Seventy serum samples collected from IDAs were analyzed by protein chip assay. ELISA, RT-PCR, and RIBA assay were used to validate the results...
April 1, 2018: Clinical Laboratory
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