MicroRNA-126 attenuates palmitate-induced apoptosis by targeting TRAF7 in HUVECs

Area of Science:

• Molecular Biology
• Cell Biology
• Biochemistry

Background:

• Palmitate, a saturated fatty acid, can induce endothelial cell dysfunction and apoptosis.
• MicroRNAs (miRNAs) play crucial roles in regulating cellular processes, including apoptosis.
• Human umbilical vein endothelial cells (HUVECs) are a key model for studying vascular biology.

Purpose of the Study:

• To investigate the role of miR-126 in palmitate-induced apoptosis of HUVECs.
• To elucidate the underlying molecular mechanisms, including the identification of direct targets.

Main Methods:

• Cell culture of HUVECs.
• Treatment with palmitate and manipulation of miR-126 levels (overexpression and inhibition).
• Assessment of apoptosis markers (caspase-3 activity, DNA fragmentation).
• Measurement of reactive oxygen species (ROS) and TNF-α.
• Western blotting and luciferase reporter assays to confirm target interaction.

Main Results:

• Palmitate treatment reduced miR-126 expression, increased ROS production, and induced apoptosis in HUVECs.
• Overexpression of miR-126 attenuated palmitate-induced apoptosis, ROS, and TNF-α levels.
• Inhibition of miR-126 exacerbated palmitate-induced apoptosis, ROS, and TNF-α.
• miR-126 directly targets and inhibits the expression of TRAF7 (TNF receptor-associated factor 7).

Conclusions:

• miR-126 exhibits a significant anti-apoptotic effect in HUVECs under palmitate stress.
• TRAF7 is identified as a direct downstream target of miR-126 in this context.
• These findings highlight miR-126 as a potential therapeutic target for conditions involving endothelial cell apoptosis due to fatty acid overload.