PMicroRNA-124a regulates LPS-induced septic cardiac dysfunction by targeting STX2

Area of Science:

• Molecular Biology
• Cardiovascular Research
• Sepsis Pathophysiology

Background:

• Sepsis-induced cardiac insufficiency is a severe complication with unclear underlying mechanisms.
• MicroRNAs (miRNAs) are implicated in various pathological processes, including cardiac dysfunction.

Purpose of the Study:

• To investigate the role of miR-124a in lipopolysaccharide (LPS)-induced septic cardiac insufficiency.
• To elucidate the underlying molecular mechanisms involving miR-124a in sepsis-related heart dysfunction.

Main Methods:

• Utilized a rat model of LPS-induced septic cardiac dysfunction.
• Administered miR-124a antagomiR and agomiR to modulate miR-124a levels.
• Employed bioinformatic analysis and luciferase reporter assays to identify and validate target genes.
• Assessed cardiac function, apoptosis, and Syntaxin-2 (STX2) expression.

Main Results:

• miR-124a expression was significantly decreased in the myocardium of septic rats.
• miR-124a antagomiR exacerbated cardiac dysfunction and apoptosis, while miR-124a agomiR offered protective effects.
• Syntaxin-2 (STX2) was identified as a direct target of miR-124a, with inverse expression patterns.
• STX2 inhibition partially reversed the protective effects of miR-124a agomiR.
• Reduced miR-124a levels were observed in the plasma of septic cardiac dysfunction patients.

Conclusions:

• miR-124a plays a protective role against LPS-induced cardiac dysfunction.
• The miR-124a/STX2 pathway represents a potential diagnostic biomarker and therapeutic target for septic cardiac dysfunction.