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Neurochemical Research

, Volume 40, Issue 1, pp 1–14 | Cite as

The Protective Effect of Epoxyeicosatrienoic Acids on Cerebral Ischemia/Reperfusion Injury is Associated with PI3K/Akt Pathway and ATP-Sensitive Potassium Channels

  • You-Yang Qu
  • Mei-Yan Yuan
  • Yu Liu
  • Xing-Jun XiaoEmail author
  • Yu-Lan ZhuEmail author
Original Paper

Abstract

Epoxyeicosatrienoic acids (EETs), the cytochrome P450 epoxygenase metabolite of arachidonic acid, have been demonstrated to have neuroprotective effect. Phosphatidylinositol 3-kinase (PI3K)/Akt and ATP-sensitive potassium (KATP) channels are thought to be important factors that mediate neuroprotection. However, little is known about the role of PI3K/Akt and KATP channels in brain after EETs administration. In vitro experiment, oxygen–glucose deprivation (OGD) was performed in cultured rat cerebral microvascular smooth muscle cells (SMCs) for 4 h. The effect of 14,15-EET on OGD induced cell apoptosis was examined after reoxygenation. Western blot and real-time PCR were used to analyze the expression of Kir6.1, SUR2B (two subunits of KATP channels) and p-Akt on cerebral microvascular SMCs. In vivo experiments, we use 12-(3-adamantan-1-yl-ureido)-dodecanoic acid [AUDA, a specific soluble epoxide hydrolase (sEH) inhibitor] to confirm the effect of EETs indirectly. Rats were injected intraperitoneally with AUDA before being subjected to middle cerebral artery occlusion (MCAO). We detected the apoptosis and the expression of p-Akt, Kir6.1 and SUR2B in ischemic penumbra. The results showed that EETs protect against cerebral ischemia/reperfusion (I/R) injury and upregulated the expression of p-Akt and Kir6.1 in both of ischemic penumbra and OGD induced cerebral microvascular SMCs. The protective effect was inhibited by Wortmannin (a specific PI3K inhibitor) and Glib (a specific KATP inhibitor) respectively in vitro experiment. In conclusion, these results suggested that the protective effect of EETs on cerebral I/R injury is associated with PI3K/Akt pathway and KATP channels. Furthermore, the PI3K pathway may contribute to mediating KATP channels on cerebral microvascular SMCs.

Keywords

Epoxyeicosatrienoic acids Cerebral ischemia/reperfusion injury PI3K/Akt pathway ATP-sensitive potassium channel Soluble epoxide hydrolase inhibitor 

Abbreviations

EETs

Epoxyeicosatrienoic acids

PI3K

Phosphatidylinositol 3-kinase

KATP

ATP-sensitive potassium

I/R

Ischemia/reperfusion

OGD

Oxygen–glucose deprivation

OGD + R

Oxygen–glucose deprivation + reoxygenation

AA

Arachidonic acid

MCAO

Middle cerebral artery occlusion

Notes

Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 81171077). We would like to thank Professor Daling Zhu from College of Pharmacy, Harbin Medical University for technical assistance.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of NeurologyThe Second Affiliated Hospital of Harbin Medical UniversityHarbinPeople’s Republic of China
  2. 2.Department of NeurologyLaizhou People’s HospitalLaizhouPeople’s Republic of China

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