New Perspectives on Stroke: The Immune-inflammatory-mitochondrial Axis

Area of Science:

• Immunology
• Neuroscience
• Mitochondrial Biology

Background:

• Acute ischemic stroke (AIS) and intracerebral hemorrhage (ICH) are distinct cerebrovascular events.
• Understanding their unique immunoregulatory and mitochondrial profiles is crucial for targeted therapies.

Purpose of the Study:

• To delineate the distinct immunoregulatory and mitochondrial characteristics in patients with AIS and ICH.
• To identify potential therapeutic targets within the immune-mitochondrial axis for stroke subtypes.

Main Methods:

• Cross-sectional study of 34 AIS, 27 ICH, and 30 control patients.
• Dynamic tracking in 1 AIS and 1 ICH patient.
• Analysis of T-cell subpopulations, mitochondrial mass, membrane potential, and cytokine profiles.

Main Results:

• AIS patients had significantly higher T regulatory lymphocytes (Treg%) and effector T regulatory lymphocytes (eTreg%) compared to ICH patients.
• The IL-10/IL-6 ratio was higher in AIS than ICH.
• AIS showed predominant CD4+ T-cell changes, while ICH exhibited more pronounced CD8+ T-cell alterations, with mitochondrial damage in T-cells in both groups.

Conclusions:

• AIS and ICH are characterized by distinct and evolving immune-inflammatory-mitochondrial axes.
• Treg cells play a role in AIS, with divergent T-cell subset involvement in AIS versus ICH.
• Findings support subtype-specific therapeutic strategies targeting the immune-mitochondrial axis in stroke.