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https://www.readbyqxmd.com/read/29232689/a-computational-model-for-regulation-of-nanoscale-glucan-exposure-in-candida-albicans
#1
Michael J Wester, Jia Lin, Aaron K Neumann
Candida albicans is a virulent human opportunistic pathogen. It evades innate immune surveillance by masking an immunogenic cell wall polysaccharide, β-glucan, from recognition by the immunoreceptor Dectin-1. Glucan unmasking by the antifungal drug caspofungin leads to changes in the nanostructure of glucan exposure accessible to Dectin-1. The physical mechanism that regulates glucan exposure is poorly understood, but it controls the nanobiology of fungal pathogen recognition. We created computational models to simulate hypothetical physical processes of unmasking glucan in a biologically realistic distribution of cell wall glucan fibrils...
2017: PloS One
https://www.readbyqxmd.com/read/29232548/genomic-biomarkers-predicting-response-to-selective-cdk4-6-inhibition-progress-in-an-elusive-search
#2
Geoffrey I Shapiro
In this issue of Cancer Cell, Gong et al. have analyzed the sensitivity of 560 cell lines to the selective CDK4/6 inhibitor abemaciclib and have defined cancers with specific genomic "D-cyclin activating features (DCAF)" as particularly vulnerable. These findings will facilitate patient selection as development of this drug class continues.
December 11, 2017: Cancer Cell
https://www.readbyqxmd.com/read/29232502/do-treatment-patterns-alter-beliefs-cancer-patients-hold-regarding-oral-oncolytic-agents
#3
Alla Sikorskii, Charles W Given, Barbara A Given, Eric Vachon, Victoria Marshall, John C Krauss, Asish Banik, Atreyee Majumder
OBJECTIVE: Cancer patients, particularly those prescribed oral oncolytic medications, face treatment side effects, and temporary and permanent stoppages of treatment. This research examines how events during treatment affect patients' beliefs regarding oral oncolytic medications. METHODS: 272 cancer patients initiating one of 28 oral oncolytic agents were followed for 12 weeks. Assessments of Beliefs About Medications Questionnaire (BMQ), symptoms, physical function, and depression measures were performed during telephone interviews at intake (medication start) and 4, 8, and 12 weeks...
December 12, 2017: Psycho-oncology
https://www.readbyqxmd.com/read/29231944/stability-of-plant-virus-based-nanocarriers-in-gastrointestinal-fluids
#4
Alberto Berardi, David J Evans, Francesca Baldelli Bombelli, George P Lomonossoff
Cowpea mosaic virus (CPMV) is a plant virus which is being extensively investigated as a drug delivery and vaccine nanocarrier for parenteral administration. However, to date little is known about the suitability of plant-based nanocarriers for oral delivery. In this study, the colloidal (i.e. aggregation), physical (i.e. denaturation) and chemical (i.e. digestion of the polypeptides) stability of CPMV and its empty virus-like particles (eVLPs) in conditions resembling the gastrointestinal fluids were evaluated...
December 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/29231195/hsd3b1-status-as-a-biomarker-of-androgen-deprivation-resistance-and-implications-for-prostate-cancer
#5
REVIEW
Daniel Hettel, Nima Sharifi
Patients with advanced prostate cancer who receive androgen deprivation therapy (ADT) almost invariably develop castration-resistant disease. The mechanism of resistance is largely based on synthesis of intratumoral androgens from adrenal precursors, requiring enzymatic action of 3β-hydroxysteroid dehydrogenase/Δ5→4 isomerase 1 (3β-HSD1), encoded by HSD3B1. A nucleotide polymorphism (1245A>C) in HSD3B1 results in a protein variant with increased steady-state levels and subsequently increased androgen synthesis from extragonadal precursors...
December 12, 2017: Nature Reviews. Urology
https://www.readbyqxmd.com/read/29231123/urinary-protein-biomarkers-of-kidney-injury-in-patients-receiving-cisplatin-chemotherapy
#6
Blessy George, Melanie S Joy, Lauren M Aleksunes
Despite recent progress in the development of novel approaches to treat cancer, traditional antineoplastic drugs, such as cisplatin, remain a mainstay of regimens targeting solid tumors. Use of cisplatin is limited by acute kidney injury, which occurs in approximately 30% of patients. Current clinical measures, such as serum creatinine and estimated glomerular filtration rate, are inadequate in their ability to detect acute kidney injury, particularly when there is only a moderate degree of injury. Thus, there is an urgent need for improved diagnostic biomarkers to predict nephrotoxicity...
January 1, 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29231057/a-critical-review-on-ramucirumab-in-the-treatment-of-advanced-urothelial-cancer
#7
Panagiotis J Vlachostergios, Aileen Lee, Charlene Thomas, Ryan Walsh, Scott T Tagawa
Advanced urothelial cancer (UC) is a lethal disease despite current advances in systemic therapy, including platinum chemotherapy combinations and immune checkpoint inhibition. Tumor angiogenesis is involved in UC growth and metastatic progression. Proangiogenic signaling through the VEGFR is a key process in UC with prognostic significance. Targeting of VEGFR2 with the monoclonal antibody ramucirumab has been tested in various different tumor types. In this review, we discuss the development of the drug in the context of its preclinical and clinical use with a focus on UC...
December 12, 2017: Future Oncology
https://www.readbyqxmd.com/read/29230953/predictors-of-cd4-cell-recovery-following-initiation-of-antiretroviral-therapy-among-hiv-1-positive-patients-with-well-estimated-dates-of-seroconversion
#8
O T Stirrup, A J Copas, A N Phillips, M J Gill, R B Geskus, G Touloumi, J Young, H C Bucher, A G Babiker
OBJECTIVES: To investigate factors that predict speed of recovery and long-term CD4 cell count in HIV-1 seroconverters initiating combination antiretroviral therapy (cART), and to quantify the influence of very early treatment initiation. We make use of all pre-treatment CD4 counts, because analyses using only a single observation at initiation may be subject to biases. METHODS: We used data from the CASCADE (Concerted Action on SeroConversion to AIDS and Death in Europe) multinational cohort collaboration of HIV-1 seroconverters...
December 1, 2017: HIV Medicine
https://www.readbyqxmd.com/read/29230350/spatially-graded-hydrogels-for-preclinical-testing-of-glioblastoma-anticancer-therapeutics
#9
S Pedron, H Polishetty, A M Pritchard, B P Mahadik, J N Sarkaria, B A C Harley
While preclinical models such as orthotopic tumors generated in mice from patient-derived specimens are widely used to predict sensitivity or therapeutic interventions for cancer, such xenografts can be slow, require extensive infrastructure, and can make in situ assessment difficult. Such concerns are heightened in highly aggressive cancers, such as glioblastoma (GBM), that display genetic diversity and short mean survival. Biomimetic biomaterial technologies offer an approach to create ex vivo models that reflect biophysical features of the tumor microenvironment (TME)...
September 2017: MRS Communications
https://www.readbyqxmd.com/read/29229971/development-of-decision-forest-models-for-prediction-of-drug-induced-liver-injury-in-humans-using-a-large-set-of-fda-approved-drugs
#10
Huixiao Hong, Shraddha Thakkar, Minjun Chen, Weida Tong
Drug-induced liver injury (DILI) presents a significant challenge to drug development and regulatory science. The FDA's Liver Toxicity Knowledge Base (LTKB) evaluated >1000 drugs for their likelihood of causing DILI in humans, of which >700 drugs were classified into three categories (most-DILI, less-DILI, and no-DILI). Based on this dataset, we developed and compared 2-class and 3-class DILI prediction models using the machine learning algorithm of Decision Forest (DF) with Mold2 structural descriptors...
December 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29229851/structure-based-prediction-of-ligand-protein-interactions-on-a-genome-wide-scale
#11
Howook Hwang, Fabian Dey, Donald Petrey, Barry Honig
We report a template-based method, LT-scanner, which scans the human proteome using protein structural alignment to identify proteins that are likely to bind ligands that are present in experimentally determined complexes. A scoring function that rapidly accounts for binding site similarities between the template and the proteins being scanned is a crucial feature of the method. The overall approach is first tested based on its ability to predict the residues on the surface of a protein that are likely to bind small-molecule ligands...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29229604/transcription-factor-activities-enhance-markers-of-drug-sensitivity-in-cancer
#12
Luz M Garcia-Alonso, Francesco Iorio, Angela Matchan, Nuno A Fonseca, Patricia Jaaks, Gareth Peat, Miguel Pignatelli, Fiammetta Falcone, Cyril H Benes, Ian Dunham, Graham R Bignell, Simon McDade, Mathew J Garnett, Julio Saez-Rodriguez
Transcriptional dysregulation induced by aberrant Transcription factors (TFs) is a key feature of cancer, but its global influence on drug sensitivity has not been examined. Here we infer the transcriptional activity of 127 TFs through analysis of RNA-seq gene expression data newly generated for 448 cancer cell lines, combined with publicly available datasets to survey a total of 1,056 cancer cell lines and 9,250 primary tumors. Predicted TF activities are supported by their agreement with independent shRNA essentiality profiles and homozygous gene deletions, and recapitulate mutant-specific mechanisms of transcriptional dysregulation in cancer...
December 11, 2017: Cancer Research
https://www.readbyqxmd.com/read/29229600/genomic-and-epigenomic-signatures-in-ovarian-cancer-associated-with-re-sensitization-to-platinum-drugs
#13
Fang Fang, Horacio Cardenas, Hao Huang, Guanglong Jiang, Susan M Perkins, Chi Zhang, Harold N Keer, Yunlong Liu, Kenneth P Nephew, Daniela Matei
DNA methylation aberrations have been implicated in acquired resistance to platinum drugs in ovarian cancer (OC). In this study, we elucidated an epigenetic signature associated with platinum drug re-sensitization that may offer utility in predicting the outcomes of patients who are co-administered a DNA methyltransferase inhibitror. The OC specimens we analyzed were derived from a recent clinical trial that compared the responses of patients with recurrent platinum-resistant OC who received carboplatin plus the DNA methyltransferase inhibitor guadecitabine or a standard of care chemotherapy regimen selected by the treating physician...
December 11, 2017: Cancer Research
https://www.readbyqxmd.com/read/29229513/modelling-drug-release-from-polymer-free-coronary-stents-with-microporous-surfaces
#14
Tuoi T N Vo, Sarah Morgan, Christopher McCormick, Sean McGinty, Sean McKee, Martin Meere
Traditional coronary drug-eluting stents (DES) are made from metal and are coated with a permanent polymer film containing an anti-proliferative drug. Subsequent to stent deployment in a diseased coronary artery, the drug releases into the artery wall and helps prevent restenosis by inhibiting the proliferation of smooth muscle cells. Although this technology has proven to be remarkably successful, there are ongoing concerns that the presence of a polymer in the artery can lead to deleterious medical complications, such as late stent thrombosis...
December 8, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29228949/a-mathematical-model-for-histamine-synthesis-release-and-control-in-varicosities
#15
Janet Best, H F Nijhout, Srimal Samaranayake, Parastoo Hashemi, Michael Reed
BACKGROUND: Histamine (HA), a small molecule that is synthesized from the amino acid histidine, plays an important role in the immune system where it is associated with allergies, inflammation, and T-cell regulation. In the brain, histamine is stored in mast cells and other non-neuronal cells and also acts as a neurotransmitter. The histamine neuron cell bodies are in the tuberomammillary (TM) nucleus of the hypothalamus and these neurons send projections throughout the central nervous system (CNS), in particular to the cerebral cortex, amygdala, basal ganglia, hippocampus, thalamus, retina, and spinal cord...
December 12, 2017: Theoretical Biology & Medical Modelling
https://www.readbyqxmd.com/read/29228881/unravelling-novel-congeners-from-acetyllysine-mimicking-ligand-targeting-a-lysine-acetyltransferase-pcaf-bromodomain
#16
Venkatesan Suryanarayanan, Sanjeev Kumar Singh
p300/CBP Associated Factor (PCAF) bromodomain (BRD), a lysine acetyltransferases, has emerged as a promising drug target as its dysfunction is linked to onset and progression of several diseases like cancer, diabetes, AIDS etc. In this study, a three featured E-Pharmacophore (ARR) was generated based on acetyllysine mimicking inhibitor of PCAF BRD which is available as co-crystal structure (PDB ID: 5FDZ). It was used for filtering small molecule databases followed by molecular docking and consequently validated using enrichment calculation...
December 11, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29228718/increased-single-strand-annealing-rather-than-non-homologous-end-joining-predicts-hereditary-ovarian-carcinoma
#17
Miriam Deniz, Tatiana Romashova, Sarah Kostezka, Anke Faul, Theresa Gundelach, Maria Moreno-Villanueva, Wolfgang Janni, Thomas W P Friedl, Lisa Wiesmüller
Mutations in genes encoding DNA double-strand break (DSB) repair components, especially homologous recombination (HR) proteins, were found to predispose to breast and ovarian cancer. Beyond high penetrance risk gene mutations underlying monogenic defects, low risk gene mutations generate polygenic defects, enlarging the fraction of individuals with a predisposing phenotype. DSB repair dysfunction opens new options for targeted therapies; poly (ADP-ribose) polymerase (PARP) inhibitors have been approved for BRCA-mutated and platinum-responsive ovarian cancers...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29228656/increased-pdgfr-beta-and-vegfr-2-protein-levels-are-associated-with-resistance-to-platinum-based-chemotherapy-and-adverse-outcome-of-ovarian-cancer-patients
#18
Stefanie Avril, Yasemin Dincer, Katharina Malinowsky, Claudia Wolff, Sibylle Gündisch, Alexander Hapfelmeier, Melanie Boxberg, Holger Bronger, Karl-Friedrich Becker, Barbara Schmalfeldt
Despite frequent initial response rates of epithelial ovarian cancer to platinum-based chemotherapy the majority of patients develop drug resistance. Our aim was to evaluate differential expression of signaling-pathway proteins in platinum-sensitive versus platinum-resistant primary epithelial ovarian cancer specimens to identify predictive biomarkers for treatment response. 192 patients were studied comprising of independent training (n = 89) and validation (n = 103) cohorts. Full-length proteins were extracted from paraffin-embedded samples including multiple regions per tumor to account for intratumoral heterogeneity...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29228648/risk-factors-for-postoperative-renal-dysfunction-following-open-surgical-repair-of-abdominal-aortic-aneurysms-retrospective-analysis
#19
Zuowei Wu, Ding Yuan, Jichun Zhao, Bin Huang
Objectives: To identify the risk factors for postoperative renal dysfunction after open surgical repair (OSR) of abdominal aortic aneurysms (AAAs) and to establish a scoring system. Results: The overall 30-day mortality rates were 22.0%(ruptured) vs 2.6% (unruptured), respectively. For the ruptured group, the independent risk factors were hemodynamic instability (P = 0.002) blood loss >1 L (P = 0.041) and preoperative creatinine >150 μmol/L (P < 0.001)...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29228619/fibrin-bearing-microparticles-marker-of-thrombo-embolic-events-in-pancreatic-and-colorectal-cancers
#20
Diane Mege, Lydie Crescence, Mehdi Ouaissi, Igor Sielezneff, Regis Guieu, Françoise Dignat-George, Christophe Dubois, Laurence Panicot-Dubois
Background: Microparticles (MPs) are plasma membrane-derived extracellular vesicles present in the bloodstream. We have described a specific signature of MPs, called microparticulosome, in colorectal (CRC) and pancreatic (PC) cancers. We observed that levels of fibrin-bearing MPs were significantly increased in patients suffering from PC and CRC in comparison with control groups. Here, we hypothesised that fibrin-MPs may constitute a relevant biomarker of thrombosis associated with cancer...
November 14, 2017: Oncotarget
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