CYP2C8-derived epoxyeicosatrienoic acids decrease oxidative stress-induced endothelial apoptosis in development of...

Area of Science:

• Biochemistry
• Molecular Biology
• Cardiovascular Research

Background:

• Atherosclerosis involves endothelial injury driven by oxidative stress.
• Cytochrome P450 enzymes, specifically CYP2C8, produce epoxyeicosatrienoic acids (EETs).
• The nuclear factor erythroid 2-related factor 2 (Nrf2) pathway is crucial for cellular defense against oxidative stress.

Purpose of the Study:

• To investigate how CYP2C8-derived EETs regulate the Nrf2 signaling pathway.
• To determine the protective role of EETs against oxidative stress-induced endothelial injuries in atherosclerosis models.

Main Methods:

• Human umbilical vein endothelial cells (HUVECs) were manipulated to express CYP2C8 or treated with exogenous EETs.
• Cells were stimulated with TNF-α to induce oxidative stress.
• Apoptosis and intracellular reactive oxygen species (ROS) production were measured using flow cytometry.
• Expression of key proteins (gp91, p47, CAT, Nrf2, HO-1, eNOS) was analyzed via Western blotting.
• Nrf2 function was inhibited using small interfering RNA (siRNA).

Main Results:

• CYP2C8-derived EETs significantly reduced TNF-α-induced apoptosis in HUVECs.
• Pretreatment with 11, 12-EET blocked TNF-α-induced ROS production and subsequent apoptosis.
• The protective effect of 11, 12-EET against apoptosis was dependent on Nrf2 signaling, as confirmed by siRNA experiments.

Conclusions:

• CYP2C8-derived EETs exert protective effects against TNF-α-induced endothelial cell apoptosis.
• EETs prevent endothelial injury by inhibiting oxidative stress through the Nrf2 signaling pathway.
• This study highlights a novel mechanism involving EETs and Nrf2 in mitigating atherosclerosis development.