Miniaturized Whole Cell-based GPCR camp Assay Using a Novel Detection System
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1 Miniaturized Whole Cell-based GPCR camp Assay Using a Novel Detection System Geetha Shankar, Ph.D. Associate Director New Lead Discovery Exelixis, Inc South San Francisco, CA
2 Overview GPCR HTS assays ACT:One camp biosensor Exelixis screening platform Case study: CB1 HTS campaign Summary
3 GPCR Signaling Pathways α q/11 PTx α i α s α 12/ 13 PLC AC Y kinases Ras GTP AC Rho GTP PIP 2 IP 3 camp raf MAP kinases (ERK1/2) camp Cytoskeletal signalling PI-3-kinase Ca i TCF SRF SRE Growth related gene promoter
4 Gq and Calcium Signaling αq GTP PLC PIP 2 IP 3 Ca 2+ i Fluorescence Imaging Plate Reader Load cells with calcium sensitive dye Changes in fluorescence correlate directly with changes in intracellular calcium 384-well format
5 Gi and Gs-coupled receptors αs GTP αi GTP Adenylyl Cyclase - camp camp
6 HTS strategies for non-gq coupled receptors Chimeric Gα proteins: Gqi5, Gqs, Gqx Couple to Gα as normal, but signal like Gq (via calcium) FLIPR adaptable Promiscuous Gα proteins Gα15/16: Overexpress to drive signaling through calcium pathway camp assays for Gi and Gs coupled Radioactive methods FP AlphaScreen Enzyme complementation assays
7 Reporter-based assays for GPCRs CRE-Luc reporterbased assay (Gscoupled GPCRs) NFAT-Bla reporterbased assay (Gqcoupled GPCRs)
8 ACT:One Biosensor
9 Biosensor based camp assay No modification of GPCRs required Endogenous and overexpressed receptors Gi and Gs coupled GPCRS Agonists and antagonists No radioactivity; fluorescence read-out (MP dye) End-point or kinetic measurements Stable signal Automation friendly No special equipment/reader
10 Example: CB1 HTS campaign using CNG biosensor technology
11 Cannabinoid Receptor 1 Project Goal: Discovery of a novel, orally-bioavailable CB1 antagonist for the treatment of obesity Clinically-validated target Rimonabant Phase 3 (Sanofi-Aventis) 1 1 CB1 CB
12
13 CB1 Gi-coupled receptor Isoproterenol CB1 (CP 55,940) EXEL αs αi Na+, Ca++ GTP + + GTP - Adenylyl Cyclase - Gs CNG CNG AC + camp camp ATP camp Measure changes in membrane potential 1536 well format Envision
14 CB1 Pharmacology: Act:One camp Assay 1536-well format F50/F CP55,940 EC 50 = 7.3nM WIN55,212-2 EC 50 = 160nM F/F nM CP55,940 1µM WIN55, log [M] Agonist log [M] AM251 Agonist stimulation Inhibition by AM251
15 High Throughput Screening Platform HTS is not capacity limiting Routine screening of 4+ MM cmpds Dynamic technology 384/1536 microtiter plate formats Continued increase in library size Complete HTS in 1-2 weeks
16 Orthogonal Compound Pooling Pool Retest N N N Assay N O F F F 10 Compounds/well in two sets of mixtures Deconvolute replicates and confirm as single compounds Low false positive and false negative hit rate Five-fold increase in HTS efficiency
17 camp assay format Isoproterenol Iso + CP55940 hits Iso + CP + compounds
18 HTS Assay Performance 3.6 M Compounds screened at 1.7 µm 1536-well format 4000 cells/well; 50 minute incubation; end-point fluorescence read Novel, robust assay format for G i -coupled receptors Z = Mean S/B = 2.2 # hits = >25,000 (75-100%) Identified multiple potent antagonists
19 Hit distribution
20 Hit distribution CB1 Hit Distribution Frequency % Induction
21 Confirmation Summary 667 Compounds confirmed upon single point retesting 208 Compounds evaluated in dose-response studies 4 < 10 nm, 73 <100 nm, 123 <500 nm IC 50 (camp) Eleven scaffolds confirmed via resynthesis IC 50 values nm >60% derived from internal combi-chem synthesis PD studies used to prioritize lead series
22 Summary of Confirmed Actives Compound CB1 camp CB1 Ki PD (100 mpk) (# examples) (nm) (nm) % reversal Rimonabant (30 mpk) EXEL-3627 (85) (300 mpk) EXEL-9628 (17) 3.2 >100 8 (300 mpk) EXEL-5412 (20) EXEL-4933 (62) EXEL-3124 (45) EXEL-2355 (52) (300 mpk) EXEL-7594 (1) EXEL-5450 (13) (300 mpk) EXEL-5649 (8) EXEL-4197 (10) EXEL-6921 (6)
23 Lead Validation Compound Progression Active resynthesized HTS compounds camp, Displacement binding (<10 nm) Pharmacodynamic assay Reversal of CB1-agonist induced hypothermia (p.o.) PD: Hypothermia model Brain/plasma levels Resyn. CB1 (camp, Ki) ADME: MLM (%) CYP450 Solubility Mouse HTS PK
24 In vitro displacement binding SAR-dependent binding observed EXEL-4933 with 3H CP55940 EXEL-4833 CP55,940 Rimonabant 200 EXEL-5321 with 3H CP55940 EXEL-5321 CP55,940 Rimonabant log[m] Compound log[m] Compound EC 50 : 8 nm Ki: 50 nm EC 50 : 5 nm Ki: 10 nm Correlation with in vivo efficacy
25 EXEL-4933 mediated prevention of hypothermia Validated model mediated by the cannabinoid system 40 Antagonist, 0 min. EXEL mg/kg EXEL mg/kg WIN, 60 min Vehicle PO+ Vehicle, 10ml/kg, IP 26 Vehicle, PO + WIN, 0.3 mg/mouse, IP EXEL :2, 300mg/kg, PO + WIN, 0.3 mg/mouse, IP % inhibition of hypothermia 68% inhibition of hypothermia
26 Summary CNG channel technology offers a novel detection method for camp measurements Technology has wide applicability to Gi and Gs coupled GPCRs Significant cost-savings with miniaturization Stable, robust signal allows for detection of potent hits
27 Acknowledgments GPCR Scott Ogus HTS John Lesnick Nicole Moore Shaun Nguyen Kirk McMillan, VP New Lead Discovery
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