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PET imaging of MRP1 function in the living brain: method development and future perspectives
1Probe Research Section, Department of Molecular Probe, Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.
Current Topics in Medicinal Chemistry
|July 22, 2010
Summary
Multidrug resistance-associated protein 1 (MRP1) is an active transporter in the brain. New PET probe strategies are needed to accurately measure MRP1 function for drug development and disease research.
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Imaging
Background:
- Multidrug resistance-associated protein 1 (MRP1) is an active transporter crucial for regulating xenobiotic and endogenous substrate passage across CNS barriers.
- MRP1 influences drug distribution in the brain, potentially limiting therapeutic efficacy for CNS diseases and being implicated in neurodegenerative disorders.
Purpose of the Study:
- To review strategies for noninvasive measurement of MRP1 function in the brain using Positron Emission Tomography (PET).
- To address challenges in developing accurate PET probes for MRP1 imaging, specifically the issue of probe elimination via diffusion alongside transporter activity.
- To propose a new PET probe design strategy for selective MRP1 imaging.
Main Methods:
- Review of existing literature on PET probes for efflux transporter imaging, focusing on MRP1 and P-glycoprotein.
- Discussion of the limitations of current PET probes, including elimination by simple diffusion.
- Proposal of a novel strategy for designing PET probes that minimize confounding elimination pathways.
Main Results:
- Existing PET probes for MRP1 and P-glycoprotein often suffer from inaccurate measurements due to elimination by both transporter activity and simple diffusion.
- A new strategy is proposed to design PET probes that are selectively transported, aiming for accurate assessment of transporter function.
- Published reports on PET imaging of MRP1 function are discussed in the context of probe development challenges.
Conclusions:
- Accurate, noninvasive measurement of brain MRP1 function is essential for evaluating drug penetration enhancers and understanding MRP1's role in neurological diseases.
- Developing PET probes that are exclusively cleared by MRP1, avoiding simple diffusion, is critical for reliable functional assessment.
- The proposed strategy offers a pathway towards improved PET imaging of MRP1 in the brain.
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