Soluble epoxide hydrolase () silencing attenuates the hydrogen peroxide-induced oxidative damage in IEC-6 cells.

INTRODUCTION

Oxidative stress can cause intestinal disease. Soluble epoxide hydrolase (sEH, ) is related to cell apoptosis. The effect of on the HO-induced oxidative damage remains unclear. Thus, we aimed to explore the effect of on oxidative damage and the underlying potential mechanism.

MATERIAL AND METHODS

The cell viability was determined using cell counting kit-8 (CCK-8) assay. The reactive oxygen species (ROS), apoptosis, and mitochondrial membrane potential (MMP) were examined using flow cytometry analysis. Commercial kits were applied to respectively determine the lactate dehydrogenase (LDH) leakage, malondialdehyde (MDA) content, and superoxide dismutase (SOD) activity. The expressions of target factors were measured by conducting quantitative reverse transcription-polymerase chain reaction (qRT-PCR) and western blot.

RESULTS

We found that knockdown of enhanced the viability of HO-treated IEC-6 cells, and that si- reduced the ROS level, MMP loss, and apoptosis in comparison to the HO model group. Knockdown of was found to decrease LDH activity and MDA content, and to improve the SOD activity in comparison to those in the HO model group. Knockdown of reduced the expressions of Fas, Fasl, Bax, and cleavedcaspase-3 and elevated the expression of Bcl-2 in HO-treated IEC-6 cells. Furthermore, we observed that knockdown of enhanced the phosphorylation of PI3K, Akt, and GSK3β, which were reduced by the treatment of HO. In addition, the anti-apoptotic effect of si-Ephx2 was enhanced in the presence of AUDA-pharmacological inhibitor.

CONCLUSIONS

silencing inhibited HO-induced oxidative damage. The PI3K/Akt/GSK3β pathway was related to the effect of si-. Our study provided a potential target for the prevention of intestinal injury.