In vivo imaging in autoimmune diseases in the central nervous system

Area of Science:

• Neuroimmunology
• Cellular Biology
• Medical Imaging

Background:

• Intravital imaging allows direct in vivo observation of cellular motility and function, contrasting with in vitro and traditional in vivo analyses.
• Autoreactive T cell infiltration into the central nervous system (CNS) is crucial in autoimmune diseases.
• Understanding T cell interactions and activation within the CNS is vital for developing targeted therapies.

Purpose of the Study:

• To review recent intravital imaging studies focusing on autoreactive T cell infiltration into the CNS.
• To provide technical background on the methods used for visualizing T cell behavior in vivo.
• To highlight the role of intravital imaging in understanding T cell activation and its therapeutic potential.

Main Methods:

• Summarizing recent literature on intravital imaging of T cell CNS infiltration.
• Describing the migratory pathways and cellular interactions of autoreactive T cells.
• Utilizing protein-based sensors to visualize T cell activation in vivo, including calcium signaling and NFAT translocation.

Main Results:

• Autoreactive T cells interact with endothelial cells and splenocytes to gain migratory phenotypes.
• T cells cross the blood-brain barrier via leptomeningeal vessels or choroid plexus.
• In vivo visualization confirmed T cell activation through antigen recognition, marked by calcium influx and NFAT nuclear translocation.

Conclusions:

• Intravital imaging provides unprecedented insights into the dynamic behavior of autoreactive T cells within the CNS.
• This technique visualizes key steps in T cell activation, including antigen recognition and signaling.
• Intravital imaging serves as a powerful platform for developing and testing novel therapeutic strategies for CNS autoimmune diseases.