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Resorufin - a lead for a new protein kinase CK2 inhibitor
Iben Skjøth Sandholt1, Birgitte Brinkmann Olsen1, Barbara Guerra1, Olaf-Georg Issinger1, Brigitte Boldyreff2

Screening of a natural compound library led to the identification of resorufin, as a highly selective and potent inhibitor for protein kinase CK2. Out of 52 kinases tested only CK2 was inhibited. The IC50 values determined for the CK2 holoenzymes were 1.5 µM and for the free catalytic subunits ca. 4 µM. In different cancer cell lines treatment with resorufin led to cell death and endogenous CK2 was inhibited.

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Experimental Determination of ADMET Parameters in High Throughput, Using Colloidal Gold Composites and a Conductive Polymer as Reporting Reagents
Roberto Martinez-Neira, Patricia De Pril, Anne Van Hoonacker, Patrick Englebienne

We developed and validated a high throughput in vitro setting to experimentally determine hSA and Orosomucoid affinities, fraction absorbed, Log BBB and Redox potential of NCEs using gold nanoparticles functionalized with proteins, lipids or conductive polymers. Such automated ADME assays provide means for more objective decisions in early drug discovery.

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Production of prostanoids in the plant Arabidopsis thaliana
Maged E. Mohamed and Colin M. Lazarus.

Prostanoids originate from PGHS action on the 20-carbon polyunsaturated fatty acid: DGLA, AA and EPA. We used cDNA expression in Saccharomyces cerevisiae and enzyme immunoassays to compare the activities of two mouse PGHS isoforms and cDNAs encoding mouse prostaglandin I synthase and thromboxane A synthase and genomic DNA encoding Trypanosoma brucei prostaglandin F synthase. All genes were active and were put in Transgenic Arabidopsis thaliana plants producing DGLA.

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Analysis of in silico stereoelectronic properties of PMD (p-menthane-3-8-diols) and its derivatives to develop a pharmacophore for insect repellent activity
Bhattacharjee AK, Chauhan K, Bathini N, Greico J, Achee N, Lawrence K, Benante JP and Gupta RK

PMD, an insect repellent that can be derived from steam distillate residue of leaves of lemon eucalyptus. No QSAR studies are known in literature. We performed ab initio (RHF/6-31G**) study of PMD derivatives. A 3D pharmacophore for repellent activity was also developed. Results indicate lipophilicity, MEP separation and localized negative MEP by oxygen atom have roles for repellency. The pharmacophore is consistent and allowed design of more effective insect repellents.

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1V. Vázquez,1O. Vázquez, 1,2M.A.Balboa, 1A. Ma. Velázquez, 1V.H. Abrego, 1B.Camacho, 1L. Martínez, 1L.A. Torres, 1A. Ramírez, 1I.Martínez, 3R.López-Castañares, 1S.Díaz-Barriga, 4J. Bocanegra, 4Froylan Gómez-Laguna, 1F. Olvera, 1E.Angeles.

As part of the Drug Design in Medicinal Chemistry Program of the UNAM, new methylthiomorpholinphenol compounds with cardiovascular effect, were studied. One of them, FESCDIPINE II, was an excellent antihypertensive drug, that has low toxicity and preliminary studies indicate that the Angiotensin-converting enzyme (ACE) system is the biological target of this compound.

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Involvement of enkephalins and delta-opioid receptors in the expression of levodopa-induced dyskinesia in a model of hemiparkinsonian rat
Fabrice Billet, Jean Costentin & Nathalie Dourmap

This study was performed to test the involvement of d-opioid receptors in dyskinesia induced by L-DOPA in hemiparkinsonian rats. Our results indicate that endogenous enkephakins modulate the expression of L-DOPA-induced dyskinesia. It also appears that d-opioid receptors located on corticostriatal terminals could be involved in the development of these dyskinesia. These results confer on d-opioid antagonists interesting properties in the improvement of Parkinson’s disease therapy.

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A Novel Design of Artificial Membrane for Improving the PAMPA Model
Xiaoxi (Kevin) Chen, Ph.D., Anthony Murawski, Linda Hladik, and Charles L. Crespi, Ph.D.

The Parallel Artificial Membrane Permeability Assay (PAMPA) is a well-accepted screening assay for ADME properties (membrane permeability).

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Validation of Time-Dependent Cytochrome P450 Inhibition assays: Use of Stable - Labeled Isotope Internal Standards for Optimal Quantitation
Elke S. Perloff, Andrew Mason, Shangara S. Dehal, Andrew P. Blanchard, Ling Morgan, Andre Dandeneau, Thuy Ho, Ronell M. Crocker, Catherine M. Chandler, Nathalie Boily, Charles L. Crespi, and David M. Stresser

Time-dependent inhibition of cytochrome P450 (CYP) metabolism can lead to nonlinear pharmacokinetics and drug-drug interactions. Recent guidance from the USFDA and drug failures attributable to toxicity that may have a basis in time-dependent inhibition, have elevated interest in this long-known undesirable property of drug candidates.

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Applications of Inside-Out Vesicle Uptake Assay to Assess the Inhibitory Effects of Various Drugs on Human MRP2 and Rat Mrp2 Transporters
Vina Ketty, Eric Sands, Joanne Bourgea, Chris J. Patten, Charles L. Crespi, Ph.D., and Guangqing Xiao

Human MRP2 and rat Mrp2 inside-out vesicles were prepared from Spodoptera frugiperda (Sf9) insect cells expressing the corresponding transporters. MRP2 mediated and ATP dependent uptake of 3H-LTC4 was conducted using the rapid filtration system in the absence or presence of MgATP.

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