Autoimmunity After Ischemic Stroke and Brain Injury.

Area of Science:

• Neuroscience
• Immunology
• Neurology

Background:

• Ischemic stroke is a leading cause of death and disability globally.
• Post-stroke sterile inflammation contributes to neuronal damage and blood-brain barrier disruption.
• Release of brain antigens can trigger autoimmune responses, bypassing tolerance mechanisms.

Purpose of the Study:

• To review the role of autoimmunity in post-lesional conditions.
• To discuss the involvement of B and T cells in stroke.
• To explore the neuroprotective or detrimental effects of adaptive immunity in stroke.

Main Methods:

• Review of existing literature on stroke, inflammation, and autoimmunity.
• Analysis of findings from human stroke patients and experimental models.
• Examination of immune cell (T cells, B cells) and antibody responses to CNS antigens.

Main Results:

• Detection of neuronal antigen-specific T cells and antibodies in stroke patients indicates humoral adaptive immunity.
• Experimental stroke models show increased autoreactive T and B cells targeting CNS antigens.
• Lesion size and functional outcomes correlate with antigen-specific immune responses to brain proteins.

Conclusions:

• Autoimmunity plays a significant role in the aftermath of stroke and other brain injuries.
• B and T cells exhibit both potentially neuroprotective and detrimental effects in post-stroke conditions.
• Understanding these immune responses is crucial for developing targeted stroke therapies.