Modeling Gadoxetate Liver Uptake and Efflux Using Dynamic Contrast-Enhanced Magnetic Resonance Imaging Enables Preclinical Quantification of Transporter Drug-Drug Interactions
| Autor: | Penny L. Hubbard Cristinacce, Neil Woodhouse, Josephine H. Naish, Glynis Nicholls, Jeffrey Penny, Leonidas Georgiou, François-Xavier Blé |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Gadolinium DTPA
Male Drug media_common.quotation_subject Contrast Media Pharmacology 030226 pharmacology & pharmacy 030218 nuclear medicine & medical imaging Mice 03 medical and health sciences Imaging Three-Dimensional 0302 clinical medicine Text mining In vivo medicine Animals Drug Interactions Radiology Nuclear Medicine and imaging media_common medicine.diagnostic_test Chemistry business.industry Reproducibility of Results Magnetic resonance imaging Transporter General Medicine Magnetic Resonance Imaging Mice Inbred C57BL Dynamic contrast Liver metabolism Liver Models Animal Efflux business |
| Zdroj: | Investigative Radiology. 53:563-570 |
| ISSN: | 0020-9996 |
| DOI: | 10.1097/rli.0000000000000480 |
| Popis: | The aim of this study was to model the in vivo transporter-mediated uptake and efflux of the hepatobiliary contrast agent gadoxetate in the liver. The efficacy of the proposed technique was assessed for its ability to provide quantitative insights into drug-drug interactions (DDIs), using rifampicin as inhibitor.Three groups of C57 mice were scanned twice with a dynamic gadoxetate-enhanced magnetic resonance imaging protocol, using a 3-dimensional spoiled gradient-echo sequence for approximately 72 minutes. Before the second magnetic resonance imaging session, 2 of the groups received a rifampicin dose of 20 (n = 7) or 40 (n = 7) mg/kg, respectively. Data from regions of interest in the liver were analyzed using 2 simplifications of a 2-compartment uptake and efflux model to provide estimates for the gadoxetate uptake rate (ki) into the hepatocytes and its efflux rate (kef) into the bile. Both models were assessed for goodness-of-fit in the group without rifampicin (n = 9), and the appropriate model was selected for assessing the ability to monitor DDIs in vivo.Seven of 9 mice from the group without rifampicin were assessed for model implementation and reproducibility. A simple 3 parameter model (ki, kef, and extracellular space, vecs) adequately described the observed liver concentration time series with mean ki = 0.47 ± 0.11 min and mean kef = 0.039 ± 0.016 min. Visually, the area under the liver concentration time profile was reduced for the groups receiving rifampicin. Furthermore, tracer kinetic modeling demonstrated a significant dose-dependent decrease in the uptake (5.9- and 17.3-fold decrease for 20 mg/kg and 40 mg/kg, respectively) and efflux rates (2.2- and 7.9-fold decrease) compared with the first scan for each group.This study presents the first in vivo implementation of a 2-compartment uptake and efflux model to monitor DDIs at the transporter-protein level, using the clinically relevant organic anion transporting polypeptide inhibitor rifampicin. The technique has the potential to be a novel alternative to other methods, allowing real-time changes in transporter DDIs to be measured directly in vivo. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|