Microglial positron emission tomography (PET) imaging in epilepsy: Applications, opportunities and pitfalls

Area of Science:

• Neuroscience
• Immunology
• Radiology

Background:

• Neuroinflammation is increasingly recognized as a significant factor in the development and progression of epilepsy.
• Microglia, the primary immune cells of the central nervous system, are key mediators of this neuroinflammation.
• The Translocator Protein (TSPO) is a mitochondrial protein highly expressed on activated microglia, making it a target for imaging.

Purpose of the Study:

• To review the principles and challenges of using Translocator Protein (TSPO) positron emission tomography (PET) imaging in the context of epilepsy.
• To explore the potential of TSPO PET imaging as a biomarker for neuroinflammation in epilepsy.
• To discuss the opportunities for TSPO imaging in the development of novel anti-inflammatory therapies for epilepsy.

Main Methods:

• Review of current literature on TSPO PET imaging and its application in epilepsy research.
• Discussion of the technical aspects and limitations of TSPO-targeted radioligands.
• Analysis of TSPO expression patterns in preclinical and clinical epilepsy models.

Main Results:

• TSPO PET imaging provides a non-invasive method to visualize and quantify neuroinflammation in vivo.
• Challenges in TSPO PET imaging include understanding TSPO polymorphism's impact on ligand binding and distinguishing between different glial activation states.
• TSPO imaging shows promise in reflecting disease activity and potentially treatment response.

Conclusions:

• TSPO PET imaging is a valuable tool for assessing neuroinflammation in epilepsy.
• Addressing the pitfalls of TSPO imaging is crucial for its reliable application.
• TSPO imaging holds significant potential as a biomarker for guiding and evaluating anti-inflammatory treatments in epilepsy.