Delayed CCL23 response is associated with poor outcomes after cardiac arrest

Area of Science:

• Immunology
• Cardiovascular Science
• Neuroscience

Background:

• Chemokines mediate leukocyte migration to inflamed tissues, intensifying local inflammation.
• Cardiac arrest (CA) triggers complex immune responses, impacting patient outcomes.
• Understanding post-CA inflammation is crucial for improving resuscitation success.

Purpose of the Study:

• To analyze chemokine and immune cell responses following cardiac arrest (CA).
• To investigate the role of chemokine CCL23 and neutrophil activation in brain injury after CA.
• To correlate chemokine levels with patient outcomes and mortality.

Main Methods:

• Analysis of 42 resuscitated cardiac arrest (CA) patients and 22 coronary artery bypass grafting (CABG) controls.
• Quantitative antibody array and endotoxin quantification in patient blood.
• Flow cytometry analysis of CCL23 production in neutrophils using a mouse model of CA/cardiopulmonary resuscitation (CPR).

Main Results:

• CCL2, CCL4, and CCL23 levels were elevated in CA patients, with distinct temporal patterns.
• High CCL23 levels correlated with increased neutrophils, neuron-specific enolase (NSE), worse cerebral performance category (CPC) scores, and higher mortality.
• CCL23 production was increased in neutrophils within the injured mouse brain tissue post-CA/CPR.

Conclusions:

• Late neutrophil activation and CCL23 production in brain tissue may exacerbate injury after CA.
• Targeting late inflammatory responses, particularly CCL23-mediated neutrophil activation, could be a therapeutic strategy to improve recovery after CA.
• Findings highlight the dual role of inflammation in CA, with both early and late phases impacting outcomes.