miR-214-3p Attenuates Sepsis-Induced Myocardial Dysfunction in Mice by Inhibiting Autophagy through PTEN/AKT/mTOR...

Area of Science:

• Cardiology
• Molecular Biology
• Cellular Biology

Background:

• Sepsis frequently leads to cardiac dysfunction, known as sepsis-induced myocardial dysfunction (SIMD).
• Autophagy is implicated in the pathogenesis of SIMD, but its precise role and regulatory mechanisms remain under investigation.
• MicroRNAs (miRNAs) are emerging as key regulators of cellular processes, including autophagy and cardiac function.

Purpose of the Study:

• To investigate the role of miR-214-3p in regulating autophagy within the context of SIMD.
• To determine if miR-214-3p can attenuate cardiac dysfunction in a mouse model of sepsis.
• To elucidate the molecular mechanisms by which miR-214-3p influences autophagy and myocardial function during sepsis.

Main Methods:

• A mouse model of sepsis was established using cecal ligation and puncture (CLP).
• Cardiac structure and function were assessed in septic mice.
• Myocardial autophagy levels were quantified using immunohistochemistry, immunofluorescence, and Western blot analyses.
• PTEN expression and the AKT/mTOR pathway were examined in myocardial tissues.

Main Results:

• miR-214-3p administration attenuated cardiac dysfunction in septic mice.
• miR-214-3p significantly inhibited myocardial autophagy levels in the heart.
• The study demonstrated that miR-214-3p suppresses autophagy by silencing PTEN expression, thereby activating the AKT/mTOR pathway.

Conclusions:

• miR-214-3p exerts a protective effect against SIMD by inhibiting cardiac autophagy through the PTEN/AKT/mTOR signaling pathway.
• These findings highlight miR-214-3p as a potential therapeutic target for managing sepsis-induced myocardial dysfunction.