Imaging of microglia activation in stroke

Area of Science:

• Neuroscience
• Immunology
• Radiology

Background:

• Activated microglia are key players in post-stroke neuroinflammation, affecting both the infarct area and remote connected regions.
• The translocator protein (TSPO) is a marker for activated microglia, expressed on their mitochondria.
• Positron emission tomography (PET) allows in vivo imaging of TSPO, enabling the study of neuroinflammation dynamics.

Purpose of the Study:

• To review current and future methods for microglia imaging in stroke.
• To discuss the advantages and limitations of TSPO-based PET imaging.
• To explore multimodal imaging approaches combining microglia and diffusion tensor imaging (DTI) for stroke recovery.

Main Methods:

• Review of existing literature on microglia imaging in stroke.
• Discussion of TSPO radioligands and PET imaging techniques.
• Analysis of multimodal imaging studies integrating PET and DTI in clinical stroke.

Main Results:

• PET imaging with TSPO radioligands offers insights into the temporal dynamics of microglial activation in vivo.
• Multimodal imaging approaches are emerging to link remote microglia activation along fiber tracts to clinical outcomes.
• Understanding remote microglia activation is crucial for post-stroke recovery.

Conclusions:

• TSPO-PET is a valuable tool for studying neuroinflammation in stroke.
• Multimodal imaging holds promise for elucidating the role of remote microglia activation in stroke recovery.
• Further research is needed to optimize imaging techniques and understand their clinical relevance.