Targeted circulating lipid mediators and immune cell gene transcripts after ST-elevation myocardial infarction

Area of Science:

• Cardiovascular Medicine
• Lipidomics
• Inflammation and Resolution Biology

Background:

• Residual inflammation is a key driver of atherosclerosis progression to myocardial infarction (MI).
• Specialized pro-resolving mediators (SPMs) derived from polyunsaturated fatty acids promote post-MI recovery, unlike proinflammatory lipid mediators (PIMs).
• Early dynamic changes in lipid mediators and gene transcripts after ST-elevation myocardial infarction (STEMI) and percutaneous coronary intervention (PCI) remain poorly understood.

Purpose of the Study:

• To assess early dynamic changes in circulating lipid mediators and lipid pathway transcripts in STEMI patients undergoing PCI.
• To investigate the temporal kinetics of inflammation and resolution signaling following PCI in STEMI.

Main Methods:

• Prospective observational study including 10 STEMI patients and 6 control subjects.
• Plasma lipid mediator profiling (targeted oxylipids) and whole blood inflammation-related transcript expression were analyzed.
• Samples were collected at baseline (pre-PCI) and at 2 and 24 hours post-PCI.

Main Results:

• STEMI patients showed higher baseline levels of linoleic acid and docosapentaenoic acid compared to controls.
• Elevated baseline PIMs (e.g., PGE2) decreased post-PCI, while some SPM levels remained elevated, suggesting simultaneous inflammation and resolution.
• Temporal kinetics indicated that both inflammation initiation and resolution processes commence concurrently as an endogenous repair mechanism in STEMI.

Conclusions:

• Early changes in lipid mediators post-PCI in STEMI patients highlight a simultaneous inflammatory and resolution response.
• The findings support the concept of endogenous repair mechanisms active during STEMI.
• Therapeutic strategies aimed at enhancing endogenous SPMs before PCI warrant consideration for improved MI treatment outcomes.