The protective effect of astrocyte-derived 14,15-epoxyeicosatrienoic acid on hydrogen peroxide-induced cell injury in astrocyte-dopaminergic neuronal cell line co-culture. Neuroscience 2012 Oct 25;223:68-76
Date
08/07/2012Pubmed ID
22863680Pubmed Central ID
PMC4003556DOI
10.1016/j.neuroscience.2012.07.045Scopus ID
2-s2.0-84865450193 (requires institutional sign-in at Scopus site) 41 CitationsAbstract
Astrocytes perform several functions that are essential for normal neuronal activity. They play a critical role in neuronal survival during ischemia and other degenerative injuries and also modulate neuronal recovery by influencing neurite outgrowth. In this study, we investigated the neuroprotective effects of astrocyte-derived 14,15-epoxyeicosatrienoic acid (14,15-EET), metabolite of arachidonic acid by cytochrome P450 epoxygenases (CYP), against oxidative stress induced by hydrogen peroxide (H(2)O(2)). We found that dopaminergic neuronal cells (N27 cell line) stimulated with two different doses of H(2)O(2) (0.1 and 1mM) for 1h showed decreased cell viability compared to the control group, while astrocytes showed less cell death after stimulation with the same doses of H(2)O(2) for 1h. Dopaminergic neuronal cells (N27 cell line) pretreated with different doses of 14,15-EET (0.1-30 μM, 30 min) before H(2)O(2) stimulation also showed increased cell viability. Furthermore, pre-treatment of the co-cultured cells with 12-(3-adamantan-1-yl-ureido)-dodecanoic acid, an inhibitor of the EET metabolizing enzyme, soluble epoxide hydrolase (sEH), before H(2)O(2) stimulation (1mM, for 1h) increased cell viability. It also increased the endogenous level of 14,15-EET in the media compared to control group. However, pretreatment with the CYP epoxygenase inhibitor miconazole (1-20 μM, 1h) before H(2)O(2) (1mM, 1h) stimulation showed decreased cell viability. Our data suggest that 14,15-EET which is released from astrocytes, enhances cell viability against oxidant-induced injury. Further understanding of the mechanism of 14,15-EET-mediated protection in dopaminergic neurons is imperative, as it could lead to novel therapeutic approaches for treating CNS neuropathologies, such as Parkinson's disease.
Author List
Terashvili M, Sarkar P, Nostrand MV, Falck JR, Harder DRMESH terms used to index this publication - Major topics in bold
8,11,14-Eicosatrienoic AcidAnalysis of Variance
Animals
Animals, Newborn
Astrocytes
Cell Survival
Cells, Cultured
Chromatography, Liquid
Coculture Techniques
Dopaminergic Neurons
Dose-Response Relationship, Drug
Drug Administration Schedule
Eicosanoids
Hippocampus
Hydrogen Peroxide
Mass Spectrometry
Membrane Potential, Mitochondrial
Neuroprostanes
Oxidants
Rats
Rats, Sprague-Dawley
Time Factors
