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https://www.readbyqxmd.com/read/29150925/one-pot-synthesis-of-a-multi-template-molecularly-imprinted-polymer-for-the-extraction-of-six-sulfonamide-residues-from-milk-before-hplc-with-diode-array-detection
#1
Maria Kechagia, Victoria Samanidou, Abuzar Kabir, Kenneth G Furton
A highly selective molecularly imprinted polymer sorbent was synthesized and employed for the simultaneous determination of six sulfonamide antibiotic residues (sulfanilamide, sulfacetamide, sulfadiazine, sulfathiazole, sulfamerazine and sulfamethizole) in milk samples. Multi-analyte imprinted particles were used as sorbent in solid phase extraction. Sulfonamides were separated on a high-performance liquid chromatography column (Merck-Lichrospher RP18e, 5 μm 250 × 4 mm) and further identified and quantified by diode array detection...
November 18, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29149832/optimizing-metal-based-chemotherapeutics-targeting-chemoresistance-related-patterns-in-molecular-tumor-immunology-and-immunosuppressive-tumor-networks
#2
Athanasios Salifoglou, Savvas Petanidis, Efrosini Kioseoglou
Tumor cell chemoresistance is a major challenge in cancer therapeutics. Major select metal-based drugs are potent anticancer agents yet they exhibit undesirable side-effects and are effective against only a few types of cancers. A need, therefore, arises for new metallodrugs with an improved spectrum of efficacy and lower toxicity. Development of anticancer drugs based on antitumor metals is currently a very active field, with considerable efforts having been made toward elucidating the mechanisms of immune action of complex metalloforms and optimizing their immunoregulatory bioactivity through appropriate structural modification...
November 16, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29149726/protein-structure-based-drug-design-from-docking-to-molecular-dynamics
#3
REVIEW
Paweł Śledź, Amedeo Caflisch
Recent years have witnessed rapid developments of computer-aided drug design methods, which have reached accuracy that allows their routine practical applications in drug discovery campaigns. Protein structure-based methods are useful for the prediction of binding modes of small molecules and their relative affinity. The high-throughput docking of up to 10(6) small molecules followed by scoring based on implicit-solvent force field can robustly identify micromolar binders using a rigid protein target. Molecular dynamics with explicit solvent is a low-throughput technique for the characterization of flexible binding sites and accurate evaluation of binding pathways, kinetics, and thermodynamics...
November 14, 2017: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/29149077/rna-virus-evolution-via-a-quasispecies-based-model-reveals-a-drug-target-with-a-high-barrier-to-resistance
#4
Richard J Bingham, Eric C Dykeman, Reidun Twarock
The rapid occurrence of therapy-resistant mutant strains provides a challenge for anti-viral therapy. An ideal drug target would be a highly conserved molecular feature in the viral life cycle, such as the packaging signals in the genomes of RNA viruses that encode an instruction manual for their efficient assembly. The ubiquity of this assembly code in RNA viruses, including major human pathogens, suggests that it confers selective advantages. However, their impact on viral evolution cannot be assessed in current models of viral infection that lack molecular details of virus assembly...
November 17, 2017: Viruses
https://www.readbyqxmd.com/read/29147652/identification-of-potent-chloride-intracellular-channel-protein-1-inhibitors-from-traditional-chinese-medicine-through-structure-based-virtual-screening-and-molecular-dynamics-analysis
#5
Wei Wang, Minghui Wan, Dongjiang Liao, Guilin Peng, Xin Xu, Weiqiang Yin, Guixin Guo, Funeng Jiang, Weide Zhong, Jianxing He
Chloride intracellular channel 1 (CLIC1) is involved in the development of most aggressive human tumors, including gastric, colon, lung, liver, and glioblastoma cancers. It has become an attractive new therapeutic target for several types of cancer. In this work, we aim to identify natural products as potent CLIC1 inhibitors from Traditional Chinese Medicine (TCM) database using structure-based virtual screening and molecular dynamics (MD) simulation. First, structure-based docking was employed to screen the refined TCM database and the top 500 TCM compounds were obtained and reranked by X-Score...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29147025/sphingolipid-metabolism-in-cancer-signalling-and-therapy
#6
REVIEW
Besim Ogretmen
Sphingolipids, including the two central bioactive lipids ceramide and sphingosine-1-phosphate (S1P), have opposing roles in regulating cancer cell death and survival, respectively, and there have been exciting developments in understanding how sphingolipid metabolism and signalling regulate these processes in response to anticancer therapy. Recent studies have provided mechanistic details of the roles of sphingolipids and their downstream targets in the regulation of tumour growth and response to chemotherapy, radiotherapy and/or immunotherapy using innovative molecular, genetic and pharmacological tools to target sphingolipid signalling nodes in cancer cells...
November 17, 2017: Nature Reviews. Cancer
https://www.readbyqxmd.com/read/29145850/targeting-protein-quality-control-pathways-in-breast-cancer
#7
REVIEW
Sara Sannino, Jeffrey L Brodsky
The efficient production, folding, and secretion of proteins is critical for cancer cell survival. However, cancer cells thrive under stress conditions that damage proteins, so many cancer cells overexpress molecular chaperones that facilitate protein folding and target misfolded proteins for degradation via the ubiquitin-proteasome or autophagy pathway. Stress response pathway induction is also important for cancer cell survival. Indeed, validated targets for anti-cancer treatments include molecular chaperones, components of the unfolded protein response, the ubiquitin-proteasome system, and autophagy...
November 16, 2017: BMC Biology
https://www.readbyqxmd.com/read/29145837/molecular-network-based-analysis-of-the-mechanism-of-liver-injury-induced-by-volatile-oils-from-artemisiae-argyi-folium
#8
Hongjie Liu, Sha Zhan, Yan Zhang, Yan Ma, Liang Chen, Lingxiu Chen, Hanqiu Dong, Min Ma, Zhe Zhang
BACKGROUND: Volatile oils from Artemisiae argyi folium (VOAAF) is reported with hepatotoxicity, but the underlying mechanism is still unclear. METHODS: In the present study this molecular mechanism was explored with the Ingenuity Pathway Analysis (IPA). The chemical components of the VOAAF were searched in the database, and their target proteins were all identified in the PubChem, while drug-induced liver injury (DILI) genes were searched in the PubMed gene databases...
November 16, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29145150/microrna-146a-knockdown-suppresses-the-progression-of-ankylosing-spondylitis-by-targeting-dickkopf-1
#9
Guijuan Di, Lingli Kong, Qing Zhao, Tao Ding
Ankylosing spondylitis (AS) seriously threatens healthy and life quality of patients, however, there is no extremely effective drug to cure the disease. Therefore, it is urgent to understand molecular basis in the progression of AS. MicroRNA-146a (miR-146a) has been demonstrated to be associated with the development of AS. However, its molecular mechanism has not been fully established. In this study, it is found that the expression levels of miR-146a and dickkopf 1 (DKK1) were respectively upregulated and downregulated in hip capsule tissues of AS patients...
November 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29144411/nucleic-acid-aptamers-emerging-applications-in-medical-imaging-nanotechnology-neurosciences-and-drug-delivery
#10
REVIEW
Pascal Röthlisberger, Cécile Gasse, Marcel Hollenstein
Recent progresses in organic chemistry and molecular biology have allowed the emergence of numerous new applications of nucleic acids that markedly deviate from their natural functions. Particularly, DNA and RNA molecules-coined aptamers-can be brought to bind to specific targets with high affinity and selectivity. While aptamers are mainly applied as biosensors, diagnostic agents, tools in proteomics and biotechnology, and as targeted therapeutics, these chemical antibodies slowly begin to be used in other fields...
November 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29143497/detection-and-monitoring-of-driver-mutations-by-next-generation-sequencing-in-squamous-cell-lung-cancer-patient-and-possible-predictive-biomarker-of-third-generation-egfr-tyrosine-kinase-inhibitors
#11
Xiaoyan Shen, Jie Shen, Hang Zhang, Yuxin Cheng, Yang Yang, Jiahui Gao, Yu Zhang, Rutian Li, Baorui Liu, Lifeng Wang
Driver mutation detection and the development of targeted drugs have significantly improved survival of advanced lung adenocarcinoma patients with driver mutations. However, we still lack understanding of druggable mutations in patients with advanced squamous cell lung cancer (SQCLC). Less than 10% of SQCLC patients have EGFR gene mutations, thus we have limited knowledge of biological molecular changes with first generation EGFR-tyrosine kinase inhibitor (TKI) resistance. We report a case of an SQCLC patient treated with first-line platinum-doublet chemotherapy...
November 16, 2017: Thoracic Cancer
https://www.readbyqxmd.com/read/29143423/treatment-and-biology-of-pediatric-acute-lymphoblastic-leukemia
#12
REVIEW
Motohiro Kato, Atsushi Manabe
Acute lymphoblastic leukemia (ALL) is the most common pediatric malignancy. In the past ALL was intractable but now the survival probability is as high as 80-90%. Improved supportive care, treatment stratification based on relapse risk, biological features of leukemic cells, and optimization of treatment regimens by nationwide and international collaboration have contributed to this dramatic improvement. While including traditional risk factors (e.g., age and leukocyte count at diagnosis), the treatment has been modified based on biological characteristics (aneuploidy and translocation) and treatment response (assessed by minimal residual disease)...
November 16, 2017: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/29142995/screening-of-novel-rgd-peptides-to-modify-nanoparticles-for-targeted-cancer-therapy
#13
Liang Ge, Xinru You, Keqing Huang, Yang Kang, Yuejian Chen, Ying Zhu, Yuan Ren, Yuan Zhang, Jun Wu, Hai Qian
New targeted RGD peptides obtained by solid phase peptide synthesis (SPPS) were successfully screened by Molecular Operating Environment (MOE) and used for the building of the 6-O-carboxymethyl chitosan based carrier with an active target on the surface. CRGDYC-6-O-carboxymethyl chitosan based nanoparticles (NPs) loaded with doxorubicin hydrochloride (DOX) were successfully prepared by an ionic gelation method with the carrier synthesized before. Synthesis conditions and formulation parameters were optimized by determining the characteristics of nanoparticles including the particle size and drug encapsulation efficiency...
November 16, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29142077/syndromic-panel-based-testing-in-clinical-microbiology
#14
REVIEW
Poornima Ramanan, Alexandra L Bryson, Matthew J Binnicker, Bobbi S Pritt, Robin Patel
The recent development of commercial panel-based molecular diagnostics for the rapid detection of pathogens in positive blood culture bottles, respiratory specimens, stool, and cerebrospinal fluid has resulted in a paradigm shift in clinical microbiology and clinical practice. This review focuses on U.S. Food and Drug Administration (FDA)-approved/cleared multiplex molecular panels with more than five targets designed to assist in the diagnosis of bloodstream, respiratory tract, gastrointestinal, or central nervous system infections...
January 2018: Clinical Microbiology Reviews
https://www.readbyqxmd.com/read/29142004/advances-in-the-management-of-men2
#15
Samuel Wells
Medullary thyroid carcinoma (MTC), a tumor derived from the neural crest, occurs either sporadically or as the dominant component of the type 2 multiple endocrine neoplasia (MEN) syndromes, MEN2A and MEN2B. The discovery that mutations in the RET protooncogene cause hereditary MTC was of great importance, since it led to the development of novel methods of diagnosis and treatment. For example, the detection of a mutated RET allele in family members at risk for inheriting MEN2A or MEN2B signaled that they would develop MTC, and possibly other components of the syndromes...
November 15, 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/29141550/autophagy-as-a-potential-therapeutic-target-in-breast-cancer-treatment
#16
Natalia Lisiak, Ewa Toton, Maria Rybczynska
One of the crucial reasons of breast cancer therapy failure is an impairment of mechanisms responsible for metabolism and cellular homeostasis, which makes it difficult to foresee the response to the treatment. Targeted therapy in breast cancer is dictated by the expression of specific molecules such as growth factor or hormone receptors. Many types of breast cancer exhibit different abnormalities in the apoptotic pathway, which confer the resistance to many forms of chemotherapy. Because of the fundamental importance of autophagy in the development and progression of cancer and its ability to affect treatment response, there has been an immense research on molecular regulation and signal transduction mechanisms that control this process...
November 14, 2017: Current Cancer Drug Targets
https://www.readbyqxmd.com/read/29141353/-progress-in-research-of-thyroid-carcinoma-related-gene-mutation-and-epigenetics
#17
W H Zheng, W W Gong, F Lu, M Yu
Thyroid cancer is one of the most common endocrine malignant tumors, and its molecular pathogenesis is also a process of multiple genes involved in many steps of carcinogenesis. With the development of molecular biology technology, a variety of related gene mutations and epigenetic phenomena have been found in thyroid cancer tissues. It is helpful to understand the latest progress in the research of the gene mutation and epigenetics of thyroid cancer for its early diagnosis, prevention and the development of targeted drugs...
November 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/29141109/hepatic-ppar%C3%AE-mediates-the-major-metabolic-effects-of-wy-14643
#18
Guolin Li, Chad N Brocker, Cen Xie, Tingting Yan, Audrey Noguchi, Kristopher W Krausz, Rong Xiang, Frank J Gonzalez
BACKGROUND AND AIM: Peroxisome proliferator-activated receptor alpha (PPARα) is a molecular target of various fibrate drugs clinically used to lower serum lipids. However, the tissue-specific functions of PPARα remain to be elucidated. This study aimed to explore the tissue-specific functions of PPARα in response to Wy-14643. METHODS: A hepatocyte-specific Ppara knockout mouse line was used to explore the impact of hepatic PPARα activity on the systemic response to treatment with the potent PPARα agonist Wy-14643...
November 15, 2017: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29140756/cellular-and-molecular-mechanisms-of-autoimmune-hepatitis
#19
G J Webb, G M Hirschfield, E L Krawitt, M E Gershwin
Autoimmune hepatitis is an uncommon idiopathic syndrome of immunemediated destruction of hepatocytes, typically associated with autoantibodies. The disease etiology is incompletely understood but includes a clear association with human leukocyte antigen (HLA) variants and other non- HLA gene variants, female sex, and the environment. Pathologically, there is a CD4+ T cell-rich lymphocytic inflammatory infiltrate with variable hepatocyte necrosis and subsequent hepatic fibrosis. Attempts to understand pathogenesis are informed by several monogenetic syndromes that may include autoimmune liver injury, by several drug and environmental agents that have been identified as triggers in a minority of cases, by human studies that point toward a central role for CD4+ effector and regulatory T cells, and by animal models of the disease...
November 15, 2017: Annual Review of Pathology
https://www.readbyqxmd.com/read/29140595/modulation-of-quorum-sensing-in-a-gram-positive-pathogen-by-linear-imprinted-copolymers-with-anti-infective-properties
#20
Anfal Motib, Antonio Guerreiro, Firas Al-Bayati, Elena Piletska, Irfan Manzoor, Sulman Shafeeq, Anagha Kadam, Oscar Kuipers, Luisa Hiller, Todd Cowen, Sergey Piletsky, Peter Andrew, Hasan Yesilkaya
Here we describe the development, characterization and biological testing of a new type of linear molecularly imprinted polymer (LMIP) designed to act as anti-infective by blocking the quorum sensing (QS) mechanism and so preventing virulence of the pathogen Streptococcus pneumoniae. The LMIP is prepared (polymerized) in presence of a template molecule, but unlike in traditional molecular imprinting approaches no cross-linker is used. This results in soluble low molecular weight polymer that can act as drug agent in vitro and in vivo...
November 15, 2017: Angewandte Chemie
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