Insular cortex neurons encode and retrieve specific immune responses.

Area of Science:

• Neuroscience
• Immunology
• Neuroimmunology

Background:

• The brain regulates peripheral immunity, but its representation of immune states is unknown.
• Understanding brain-immune interactions is crucial for treating inflammatory diseases.

Purpose of the Study:

• To investigate if the brain stores immune-related information.
• To identify brain regions involved in immune system representation.
• To explore the retrieval of immune states through neuronal activity.

Main Methods:

• Used FosTRAP (activity-dependent cell labeling) in mice.
• Captured neuronal ensembles in the insular cortex during inflammation (DSS colitis, zymosan peritonitis).
• Utilized chemogenetics to reactivate specific neuronal ensembles.

Main Results:

• The insular cortex (InsCtx) was identified as a key brain region storing immune information.
• Reactivation of InsCtx neuronal ensembles successfully retrieved specific inflammatory states.
• Demonstrated that neuronal ensembles encode distinct inflammatory conditions.

Conclusions:

• The brain, specifically the insular cortex, stores information about peripheral immune states.
• Neuronal ensembles can represent and retrieve specific immune responses.
• This extends the concept of immunological memory to neuronal representations of inflammation.