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Friday, July 25, 2014
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Evaluation Of Single Point And IC50 Shift Assays For Measuring Time-Dependent Inhibition Of Drug Discovery Compounds
Katie Fox, Rosey Pearson, Phillip Butler, Clive Dilworth

The aim of this study is to evaluate different assay designs, and data analysis methodology for measuring the extent of TDI for known inhibitors. We propose a reversible inhibition and TDI screening platform to cover early phase compounds, which enables accurate decisions to be made regarding development of compounds which could cause DDIs.

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GALAS Modeling Methodology Applications in the Prediction of the Drug Safety Related Properties
Andrius Sazonovas, Remigijus Didziapetris, Justas Dapkunas, Liutauras Juska, Pranas Japertas

Early computational evaluation of drug candidate properties related to its pharmaceutical safety (such as hERG inhibition induced cardiotoxicity or CYP3A4 inhibition responsible various unwanted drug-drug interactions) is becoming increasingly important in the drug discovery process.

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Probabilistic Predictive Model of the Human Liver Microsomal Metabolism Regioselectivity
Justas Dapkunas, Andrius Sazonovas, Pranas Japertas

Analytical identification of metabolites for a drug candidate is usually a time consuming and low-throughput task which is performed only in late drug development phases.Therefore, the ability to predict possible sites of human liver microsomal metabolism using in silico techniques would be highly beneficial for any medicinal chemist.

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Mechanistic Prediction of Volume of Distribution: The Influence of Plasma and Tissue Binding
Kiril Lanevskij, Remigijus Didziapetris, Pranas Japertas

Plasma protein binding (usually expressed as a percentage bound fraction %PPB) and volume of distribution (Vd) are the two major parameters characterizing drug disposition in the body.

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Nitric Oxide Decreases the Expression and Activity of the Ubiquitin-Conjugating Enzyme UbcH10
Nick D. Tsihlis, PhD, Chris S. Oustwani, BA, Ashley K. Vavra, MD, Qun Jiang, MD and Melina R. Kibbe, MD

Nitric oxide (NO) has been shown to limit the formation of neointimal hyperplasia in animal models of arterial injury. Ubiquitination proceeds via formation of thioester bonds and NO can act to disrupt those bonds. We report that NO decreases the activity and expression of UbcH10 in vitro, and decreases the expression of UbcH10 following arterial injury in vivo. Therefore, UbcH10 may be a promising therapeutic target for inhibiting neointimal hyperplasia.

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High-Throughput Multiplexed Assay for Analysis of Hematopoietic Stem Cells Differentiation and Hematopoietic Toxicity
Oksana Sirenko*1, Pierre Turpin1, Yen-Wen Chen1, Jayne Hesley1, Juan L. Almara2, Daniel Zimmerman2, David Novo2, H. Roger Tang1, and Evan F. Cromwell1

Hematopoietic stem cells (HSCs) give rise to all the blood cell types and are important for cell therapy and drug development. During the development of lymphoid and myeloid lineages, HSC differentiate into committed hematopoietic progenitors. Monitoring the expansion and differentiation of HSCs into lineage-commited hematopoietic progenitors is important for research of hematopoiesis and developing therspeutic processes with HSCs

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The Transcreener® ADP2 Universal Kinase Assay from BellBrook Labs is readily performed on BMG LABTECH microplate readers using different assay formats

The Transcreener® ADP2 FI assay kit from BellBrook Labs is a simple one-step competitive red fluorescence immunoassay based on the detection of ADP. In this application note we show that this assay is compatible with four different microplate readers from BMG LABTECH. With the PHERAstar FS and Plus, as well as the POLARstar and FLUOstar Omegas comparable standard curves and EC50 values were obtained.

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Predicting hepatotoxicity: Reactive metabolite trapping using glutathione and freshly isolated hepatocytes
Birks, V., Webber, G., Geoffroy, S., Cole, R., and Wood, S.

This poster presents our results to date using clozapine (a compound known to be associated with GSH-adduct formation) as substrate and using stable isotope GSH (GSH13C2,15N) to enhance specificity. In addition, all analyses have been conducted using an Waters Acquity UPLC-MS/MS. Results we have obtained in hepatocytes are compared against findings using human liver microsomes (HLM).

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In-silico Prediction of Human Intestinal Absorption and human oral bioavailability
Aixia Yan*

Human intestinal absorption (HIA) and human oral bioavailability are two important ADME properties in drug design. We built some in-silico models for classification of human intestinal absorption (HIA) and human oral bioavailability by Kohonen’s self-organizing Neural Network (KohNN), and several quantitative models for prediction of HIA and bioavailability of several subset compounds datasets by Support Vector Machine (SVM).

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Showing Results 41 - 50 of 108
Scientific News
NIST Instrument Enables High-speed Chemical Imaging of Tissues
Researchers have demonstrated a dramatically improved technique for analyzing biological cells and tissues based on characteristic molecular vibration "signatures."
Finding Could Revolutionize Drug Discovery
A study by researchers at IRB Barcelona reveals the existence of information highways that connect and correlate distant sites within a single protein.
Researchers Develop ‘Onion’ Vesicles for Drug Delivery
University of Pennsylvania researchers have shown that dendrimer-based vesicles self-assemble with concentric layers of membranes, much like an onion.
Validation of Drug Toxicity Prediction using DiscoveRx Model
BioMAP® Systems was shown to identify important safety aspects of drugs and chemicals more efficiently and accurately than can be achieved by animal testing.
System 'Prints' Precise, Tailored Drug Dosages
The new approach uses a combination of data and mathematics to determine the precise dosage.
Mice and Rats Stressed by Male Experimenters
An international team of pain researchers led by scientists at McGill University have found that the gender of the experimenters has a big impact on the stress levels of rodents.
Skin Layer Grown in Lab Could Replace Animal Testing
Skin layer grown from human stem cells could replace animals in drug and cosmetics testing.
Observing Behavior of Single Molecules in Real Time
New technique developed by Stanford scientists allows observation of single molecules of protein or DNA as they bind with other molecules.
Development and Validation of LC/MS/MS Method and its Application to a Pharmacokinetic Study
Researchers aimed to develop a LC/MS/MS method to monitor plasma levels of montelukast, gliclazide, and nifedipine for application in pharmacokinetic studies and routine clinical practice.
Mini-Livers Show Promise to Reduce Animal Use in Science
Using this method, cells from one mouse could be used to test 1000 drug compounds to treat liver disease, and reduce animal use by up to 50,000.
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