How discovery activities can influence metabolic profiling in the regulatory space? C. DELATOUR EBF, 25 th September 2015
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1 How discovery activities can influence metabolic profiling in the regulatory space? C. DELATOUR EBF, 25 th September 2015
2 Outline 2 ן Background - Objectives - Shift in Workflow - Metabolite in safety testing (MIST) - Regulatory Guidance ן Time line of metabolite profiling ן Tools ן Collaborations in Qual/Quan process ן Animal exposure challenging ן Study cases ן Metabolite profiling method ן Strategy and reporting ן Conclusion
3 Metabolite Profiling Objectives 3 To ensure patient safety Potential metabolite and contribution to the pharmacological response as well as side effects Identifying structural alerts and risk assessment Comparing metabolite exposure in preclinical toxicological species and the first study in healthy human volunteers
4 Shift from typical workflow to scientific understanding and knowledge 4 PAST PRESENT Shift Knowledge on known compound(s) Broad knowledge on (un)known compound(s)
5 Two Types of Toxic Mechanisms 5 Stable Metabolite with Reversible Interaction on Macromolecules Reactive Metabolite with Irreversible Interaction on Macromolecules Stable As circulating metabolite Unstable Find as sign metabolites in bile or excreta On-target pharmacology Off-target pharmacology General tissue effects Immunoallergic Protein, nucleic alteration
6 Regulatory Guidelines 6 FDA Metabolite(s) at 10% of parent drug in systemic exposure at Steady state (AUC) Circulating (excreted on case-by-case, drug has its own story) ICH Metabolite(s) at 10% of total drug related exposure Animal exposure at least 50% of human metabolite exposure Circulating and excreted Specific consideration on low dose drugs DDI Metabolite(s) at 25% Victim (Total Clearance) Perpetrator (AUC)
7 Time line of Metabolite Profiling In Vitro Cross Species CYP3A4 Impact Met. Identification Markush Structure In vitro Metabolic Stability Microsomes Hepatocytes In vitro Reactive Met. Animal species : plasma Accessory: urine bile In vitro/in vivo correlation Met. Identification Metabolite derivation Metabolite Isolation (NMR) Pharmacology testing In vivo Toxicological Studies AMS Definitive 14 c studies human/animals Target ID Target validation Hit to Lead Lead Optimization Preclinical Dev. Clinical Dev. Market Screening Method Validated Method In vitro Disproportionate, Unique Human Metabolite Safety Concern Qualified Method In vivo Disproportionate, Unique Human Metabolite Safety Concern
8 Tools 8 Sample preparation: Ostro Plate Ultra Performance Liquid Chromatography Mass Spectrometry: HMRS Software: Metabolynx/ Mass MetaSite In silico prediction : MetaSite Matrix effects Signal/ noise Metabolite detection Friendly Normalization Robustness Matrix effects Signal/ noise Efficiency Normalization (Nano) Solvent (Nano) Selectivity Sensitivity Minimal Optimization Full Scan Quantification Mass accuracy Data reprocessing Searches, identifies +integrates metabolites Assigns elemental composition Performs control sample comparison Metabolite Prediction Related to cytochromemediated Phase I reactions Thermodynamic (enzyme substrate) and kinetic Metabolite Profiling Biomarkers Automatic set up acquisition Ranking of metabolites Fragmentation (MS E ) Displays kinetic metabolites formation Compatible MS equipment (Mass Metasite)
9 Collaborations in the Qual/Quan Process Metabolite Profiling Screening / Qualified Method 9 Pharmacology Bioanalytical Team DMPK In vitro/in vivo metabolite Characterization Isolation DDI Chemical Design Chemistry Isolation Identification Quantification Team Project
10 Animal Exposure 10 To ensure animal exposure for toxicological coverage Challenges Reproducible in vitro qualitative method ( 1µM) In vitro drug disappearance rate (<30%) should be close to the metabolite formation rate _ reflecting primary metabolism Ability to provide semi-quantitation data Response factor impact Matrix effect impact To characterize metabolic pathway (phenotype _ DDI _ Safety) in different species To give adequate information for validation
11 11 Sample preparation Rat Plasma PO 1mg/kg N-dealkylation Monkey Plasma PO 3mg/kg Supernatant Evaporation HCl 1N Extraction Evaporation dilution 1 NH3 1% Extraction Evaporation dilution 10 ACN PPT or SPE dilution 10 Isomerism Rat/Dog Hepatocytes 1µM Ionization Process Rat Plasma (PO 3mg/kg) Plasma Sample
12 Metabolite Profiling Method 12 Rat PO 3mg/kg Sample Clean-up 1V species plasma or brain homogenate + 4V human plasma Ostro elution by Acetonitrile + 1% acetic acid Matrix Normalization Robustness Signal/Noise Dilution OSTRO PLASMA Instrument: UPLC Acquity + PDA Column : C18 100mm, 1.8µM Mobile Phase A : Ammonium Acetate 10mM Mobile Phase B : Acetonitrile Flow Rate: 4-400µL/min Gradient 90 %A 90%B Efficiency Reproducibility Response Normalization Spectra quality PPT Strong Needle Wash: Weak Needle Wash: 5min <RT Drug >9 min 5% Water/95% Acetonitrile 95% Water/5% Acetonitrile Robustness Wavelength: nm OSTRO BRAIN Instrument: Xevo G2S Ionization Mode: ESI+/- TOF Optic Mode: Resolution (35000 FWHM) Acquisition Mode: Centroid MS E Scan range: /1200 amu Scan Time: 0.1s Collision Energy: Trap CE ramp from 15 to 35v Accuracy Full Mass Range MS E data Signal Normalization PPT Software: Metabolynx / MassMetaSite 1- Metabolite Profiling based on Structure Threshold Control Comparison Mass Data Filtering 2- Metabolite Quantification Selected Metabolite (exact mass / retention time) Sum in Excell Files Identification Quantification Reporting
13 Strategy and Reporting Biotransformation Team Implication 13 Target Validation Hit Identification Structure Reactivity Lead Hit To Lead Optimization Identify Chemical Series wo safety issues Candidate Selection Metabolite Profiling Screening Pre Clinical Validation Markush Structure Extensive/Intensive Disproportionate Cyp3A4 Implication <50µg Production Circulating Safety * New Design Candidate
14 Strategy and Reporting 14 Biotransformation Team Implication Target Validation Hit Identification Hit To Lead Lead Optimization Candidate Selection Pre Clinical Structure Reactivity Identify Chemical Series wo safety issues Metabolite Profiling Qualified Validation BA Team AMS Major Metabolite Synthesis Cross species Animal Exposure Metabolic Pathways Safety concern AMS
15 Tools Conclusion Consider using high resolution mass spectrometry to quantify and identify drugs and its metabolites 15 Ultra-performance of liquid chromatographic systems to correlate in vitro / in vivo cross species studies Better clean-up/sample preparation Metabolite Isolation 2D-LC / NMR and metabolite derivation Prediction software (Derek, Meteor, MetaSite,..) Drivers To impact drug design To determine metabolite kinetic in human To ensure animal exposure for toxicological coverage To improve prediction of unique metabolite To predict risk assessment and at which concentration To translate these assessment to in vivo models To allow retrospective data reviewing to predict clinical situation How discovery activities can influence metabolic profiling in the regulatory space?
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