Integrating in Silico and in Vitro Approaches To Predict Drug Accessibility to the Central Nervous System
| Autor: | Christopher N. Luscombe, Houfu Liu, Jasminder Sahi, Yan-Yan Zhang, Scott G. Summerfield |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Central Nervous System
Male 0301 basic medicine Drug Quantitative structure–activity relationship In silico media_common.quotation_subject Central nervous system Quantitative Structure-Activity Relationship Pharmaceutical Science Biology Pharmacology 030226 pharmacology & pharmacy Permeability Rats Sprague-Dawley 03 medical and health sciences 0302 clinical medicine In vivo Drug Discovery medicine Animals Humans Computer Simulation ATP Binding Cassette Transporter Subfamily B Member 1 Rats Wistar media_common Drug discovery Biological Transport Chemical space Rats 030104 developmental biology medicine.anatomical_structure Blood-Brain Barrier Molecular Medicine Efflux Central Nervous System Agents |
| Zdroj: | Molecular Pharmaceutics. 13:1540-1550 |
| ISSN: | 1543-8392 1543-8384 |
| Popis: | Estimation of uptake across the blood-brain barrier (BBB) is key to designing central nervous system (CNS) therapeutics. In silico approaches ranging from physicochemical rules to quantitative structure-activity relationship (QSAR) models are utilized to predict potential for CNS penetration of new chemical entities. However, there are still gaps in our knowledge of (1) the relationship between marketed human drug derived CNS-accessible chemical space and preclinical neuropharmacokinetic (neuroPK) data, (2) interpretability of the selected physicochemical descriptors, and (3) correlation of the in vitro human P-glycoprotein (P-gp) efflux ratio (ER) and in vivo rodent unbound brain-to-blood ratio (Kp,uu), as these are assays routinely used to predict clinical CNS exposure, during drug discovery. To close these gaps, we explored the CNS druglike property boundaries of 920 market oral drugs (315 CNS and 605 non-CNS) and 846 compounds (54 CNS drugs and 792 proprietary GlaxoSmithKline compounds) with available rat Kp,uu data. The exact permeability coefficient (Pexact) and P-gp ER were determined for 176 compounds from the rat Kp,uu data set. Receiver operating characteristic curves were performed to evaluate the predictive power of human P-gp ER for rat Kp,uu. Our data demonstrates that simple physicochemical rules (most acidic pKa ≥ 9.5 and TPSA100) in combination with P-gp ER1.5 provide mechanistic insights for filtering BBB permeable compounds. For comparison, six classification modeling methods were investigated using multiple sets of in silico molecular descriptors. We present a random forest model with excellent predictive power (∼0.75 overall accuracy) using the rat neuroPK data set. We also observed good concordance between the structural interpretation results and physicochemical descriptor importance from the Kp,uu classification QSAR model. In summary, we propose a novel, hybrid in silico/in vitro approach and an in silico screening model for the effective development of chemical series with the potential to achieve optimal CNS exposure. |
| Databáze: | OpenAIRE |
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