Mel Reichman on Pool Shark’s Cues for More Efficient Drug Discovery - Presentation Transcript
Accelerating Exploration of Chemical and Biological Space for Academic Drug Discovery [email_address] . www.limr.org (see research Services—LCGC)
Lankenau Institute for Medical Research (LIMR). Wynnewood, PA is an non-profit organization of ~22 independent faculty and other principal investigators who conduct basic and clinical research in cancer, diabetes, and cardiovascular disease. Founded in 1927. “ In medicine, hope springs from research”
Summary
Origins of NIH Roadmap
Accelerate Lead Discovery 500%
New Models for Pharma-Academia Discovery
American Academia: A Golden Goose of Innovation? $100 Billion $500 Billion Bayh-Dole Act 1980
The COX-2 Story: Timeline 1992: Patent filed 1992: Merck and Searle begin COX-2 program 1998: Celebrex approved, 6 months later Vioxx approved 4/11/2000: U.S. Patent No. 6,048,850 (the '850 patent) issues (‘kitchen sink’) 4/12/2000: UR initiates suit against Searle (Pfizer) 3/5/2003: UR looses up to Supreme Court October, 2003: NIH Roadmap announced
Why UR Lost “ Because the inventors here simply failed to take the last critical step of actually isolating a compound, or even developing a process through which one of skill would be directly led to such a compound, this patent involves "little more than a research plan," the court concluded. ( http://pub.bna.com/ptcj/006161.pdf ). ‘ The University had claimed a method requiring, yet provided no written description of, a compound that could inhibit COX-2 and, therefore, the patent was invalid.’
"We are the National Institutes of Health, not the National Institutes of Biology," Elias A. Zerhouni, M.D. says. "We need to reengineer how we apply our research to humans." ( http://www.the-scientist.com/2004/2/16/44/1 ) New Roadmap for 21 st Century Translational Research
Harbinger of Change
Proboscis for Probes? volume 5 number 7 JUly 2009 nature chemical biology
http://genome.gov/Pages/About/OD/ReportsPublications/AustinHHT060806.pdf With New Models In place
‘ High Throughput’ Screening?
>99.5% of the cost is to generate null data
HTS is binary; 0.5% hit rate, 99.5% inert rate
Positive confirmation rates from HTS = ca. 30%-80%
False negatives rate > 0
No other bioassay field runs n = 1 assays
Goal of HTS is to find the best leads faster
500% faster; with 80% fewer resources?
Self Deconvoluting Compressed Libraries
Pooled sample testing dates to WWII
Used in developing economies for blood safety testing
NAT pooling trials ongoing in US (HIV, HCV)
Important Product Usage and Safety Information The ABBOTT PRISM HIV O Plus test (Human Immunodeficiency Virus Types 1 and 2 (E. coli, B. megaterium, Recombinant) Antigen and Synthetic Peptide) can be used by laboratory professionals to screen individual donations of blood for antibodies to HIV-1 (anti-HIV-1) Groups M and O and /or antibodies to HIV-2 (anti-HIV-2). ABBOTT PRISM HIV O Plus can also be used as an aid in the diagnosis of HIV-1/HIV-2 infection. This assay has not been validated for use with pooled specimens and is not intended for use on cord blood specimens.
Hughes-Oliver, JM. Pooling experiments for blood screening and drug discovery. In: Screening Methods for Experimentation in Industry, Drug Discovery, and Genetics. Dean, Angela; Lewis, Susan (Eds.), 21-47. Springer 2006
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Devlin, J.; Lian, A.; Trinh, L.; Polokoff, M.; Senator, D.; Zheng, W.; Kondracki, J.; Kretschmer, P.; Morser, J.; Lipson, S.; Spann, R.; Loughlin, J.; Dunn, K.; Morrissey, M. High capacity screening of pooled compounds: Identification of the active compound without re-assay of pool members. Drug DeV. Res. (1996) 80-85.
Feng BY, Shoichet BK. Synergy and antagonism of promiscuous inhibition in multiple-compound mixtures. J. Med. Chem. (2006) 2151-4.
Chung, T. Screen Compounds Singly: Why Muck It Up? J. Biomol. Screening (1998) 171-173.
Konings DA, Wyatt JR, Ecker DJ, Freier SM. Strategies for Rapid Deconvolution of Combinatorial Libraries: Comparative Evaluation Using a Model System. J. Med. Chem. (1997) 4386-95.
Snider, M. Screening of Compound Libraries: Consomme or Gumbo? J. Biomol. Screening (1998) 169-170.
Oprea, TI. Chemoinformatics in Drug Discovery. In: Chemoinformatics in Drug Discovery Oprea, TI (Ed.) 25-42, Wiley 2005.
Cummins, D. Pharmaceutical drug discovery: hunting the blockbuster drug. In: Screening Methods for Experimentation in Industry, Drug Discovery, and Genetics. Dean, Angela; Lewis, Susan (Eds.) 69-114. Springer 2006.
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von Ahsen O, Schmidt A, Klotz M, Parczyk K. Assay concordance between SPA and TR-FRET in high-throughput screening. J Biomol Screen. (2006) 606-
Leach AR, Bradshaw J, Green DV, Hann MM, Delany JJ 3rd. Implementation of a system for reagent selection and library enumeration, profiling, and design. J. Chem. Inf. Comput. Sci. (1999) 1161-72.
Spencer R. W. High-throughput screening of historic collections: observations on file size, biological targets, and file diversity. Biotechnol. Bioeng. (1998) 61-67.
New Approaches, Software and Data Mining www. ceuticalsoft .com
The retinoblastoma tumor suppressor pathway contains multiple oncogenes (green) and tumor suppressors (red) and is dysfunctional in almost every human tumor Münger K PNAS 2003;100:2165-2167
ELISA assay was adapted to 384-well format to do a HTS of >80,000 compounds
Assay measures the amount of E2F bound to pRb upon addition of 16E7 (CR2/CR3) +/- compound
prevent E7-mediated E2F displacement from pRb
Kindly provided by D. Ferra, Wistar Institute) High Signal Add E2F – specific 1° Ab Wash Add HRP-linked 2° Ab Wash Add luminescence substrate Wash
Pilot Run Library OCL009 9 E7-inhibitors—pRB/E2F
Trends Observed for Hit Categories E7/pRB-E2F Conf. Rate
Fructosamine –3-Kinase Pathway in Diabetes Fructoselysine Glucose + Lysine Fructoselysine-3- Phosphate FRUCTOSAMINE- 3- KINASE 3DG + LYSINE + Pi Glycated Protein DIET DIABETICS Fructoselysine Glucose + Lysine Fructoselysine-3- Phosphate 3DG + LYSINE + Pi Glycated Protein NON-DIABETICS Diabetic complications Nephropathy Retinopathy Neuropathy Kindly provided by Dynamis Therapeutics Inc.
ADP
Universal Kinase Assay
Pilot Run Library OCL009 9 FN3K Inhibitor Screen
Pilot HTS Results Library LCGC-OCL-009 HTS Results 8 x 8,000 compounds = 64K
Support HTS follow-up or focused library ‘screening on the fly’
$$Multimillion infrastructure available at reasonable fee-for-service model
Pricing for long-term cost-recovery costs plus reasonable margin
Hybrid business model of support-service and academic research collaboration
Indelible Audit Trail -20 o C Operation Consolidate Molecular Diversity Collections Maxiprep genomic DNA extractions for molecular epidemiology studies and biorepositories. CA Garcia-Sepulveda et al., Mol Biol Rep. 2009 Jul 17 Toward noninvasive genomic screening of lung cancer patients. L V Sequist et al., Journal of Clinical Oncology, Vol 27, No 16 (June 1), 2009 epsilon delta gamma beta alpha Abbreviated HTS
FIGURE 3
Present Biorepository Practice
Summary
HTS has become an accepted translational research approach in academia
Far more published support for method than anecdotal evidence against
NARS support helps ensure a finer net for capturing new leads
New software tools helps ensure a finer net for capturing new leads
LCGC can enable ANY lab for true HTS—better than present practice?
Resources at Drexel can become recruited within emerging collaborative research networks, especially in greater Philly region
Acknowledgements
George Prendergast, Todd Abrams Tam Nguyen (LIMR)
Scott Donover Amanda Schabdach (LCGC)
Chip Allee (CeuticalSoft Inc.)
Marlin Yohn et al (Istech) and Ron Miller et al (REMS)—et al.
Dave Schultz and Danelia Fera (Wistar), Seth Goldenberg (Progenra), Ricardo Macaroon, Dwight Morrow and Snehal Bhat (GSK), Mike Schwartz and Alice Marcy (Dynamis)
Mel Reichman, senior investigator and director of t more
Mel Reichman, senior investigator and director of the LIMR Chemical Genomics Center at the Lankenau Institute for Medical Research presents at the chemistry department at Drexel University on November 12, 2009.
Modern drug discovery by high-throughput screening (HTS) begins with testing hundreds of thousands of compounds in biological assays. The confirmed hit rate for typical HTS is less than 0.5%; therefore, 99.5% of the costs of HTS are for generating null data. Orthogonal convolution of compound libraries (OCL) is 500% more efficient than present HTS practice. The OCL method combines 10 compounds per well. An advantage of this method is that each compound is represented twice in two separately arrayed pools. The potential for the approach to better enable academic centers of excellence to validate medicinally relevant biological targets is discussed. less
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