Using positron emission tomography to study transporter-mediated drug-drug interactions in tissues

Area of Science:

• Pharmacology
• Biomedical Imaging
• Drug Metabolism

Background:

• Drug disposition is significantly influenced by membrane transporters.
• Transporter-mediated drug-drug interactions (DDIs) can alter tissue drug concentrations without affecting systemic exposure.
• Understanding tissue-specific DDIs is vital for predicting drug efficacy and toxicity.

Purpose of the Study:

• To highlight the role of positron emission tomography (PET) in evaluating transporter-mediated DDIs.
• To demonstrate the application of PET for assessing DDIs within specific organs.
• To emphasize the importance of tissue exposure in DDI assessment.

Main Methods:

• Utilizing positron emission tomography (PET) as a noninvasive imaging modality.
• Analyzing changes in tissue drug exposure resulting from DDIs.
• Presenting case examples of PET application in different organs.

Main Results:

• PET imaging can reveal DDIs that impact tissue drug distribution.
• Significant alterations in tissue drug exposure due to transporter interactions were observed.
• The study provides evidence for PET's utility in organ-specific DDI assessment.

Conclusions:

• Positron emission tomography (PET) is a valuable tool for investigating transporter-mediated DDIs.
• PET enables the assessment of DDIs at the tissue level, complementing systemic exposure data.
• This imaging approach is essential for a comprehensive understanding of drug interactions in vivo.