| The protective effect of astrocyte-derived 14,15-EET on H(2)O(2)-induced cell injury in Astrocyte-dopaminergic neuronal cell line co-culture. | |
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MedLine Citation:
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PMID: 22863680 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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 1 mM) for 1h showed decreased cell viability compared to the control group, while astrocytes co-cultured with dopaminergic neuronal cell lines prevented cell during 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 (AUDA), an inhibitor of the EET metabolizing enzyme, soluble epoxide hydrolase (sEH), before H(2)O(2) stimulation (1 mM, 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) (1 mM, 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. |
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Authors:
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Maia Terashvili; Pallabi Sarkar; Meg Van Nostrand; John R Falck; David R Harder |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-7-31 |
Journal Detail:
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Title: Neuroscience Volume: - ISSN: 1873-7544 ISO Abbreviation: Neuroscience Publication Date: 2012 Jul |
Date Detail:
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Created Date: 2012-8-6 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7605074 Medline TA: Neuroscience Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012. Published by Elsevier Ltd. |
Affiliation:
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Department of Physiology, Cardiovascular Research Center, Medical College of Wisconsin, Milwaukee, WI 53226. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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