2011年4月
Effects of erythropoietin on intracellular calcium concentration of rat primary cortical neurons
BRAIN RESEARCH
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- 巻
- 1387
- 号
- 開始ページ
- 8
- 終了ページ
- 18
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.brainres.2011.02.077
- 出版者・発行元
- ELSEVIER SCIENCE BV
Erythropoietin (Epo) has been shown to afford neuroprotection in many experimental models. Although the cytosolic Ca2+ concentration ([Ca2+)](i)) is an important factor regulating cell survival, the effects of Epo on [Ca2+](i) in neurons are not fully elucidated. We studied the effects of human recombinant Epo on [Ca2+](i) of rat primary cortical neurons in normal and excitotoxic conditions. Changes in [Ca2+](i) were measured using fura-2 microfluorometry in rat primary cortical cultures. In the control condition with 2 mM Mg2+ in the bath solution, Epo at 4 u/ml significantly increased the fluorescence ratio, but the Epo-induced increase in the fluorescence ratio was abolished by omission of Ca2+ from the bath solution and by the addition of cadmium. Omission of Mg2+ supplementation with glycine resulted in basal and periodic increases in the fluorescence ratio, due to sustained activation of N-methyl-D-asparate (NMDA) receptors. Epo at 0.4 and 4 u/ml significantly decreased the fluorescence ratio in this condition, and this effect was attenuated by the phosphoinositide 3-kinase (PI3K) inhibitors, LY 294002 and wortmannin, and the Ca-activated K channel blocker, iberiotoxin. In the presence of Mg2+ and exogenous glutamate, 4 but not 0.4 u/ml Epo slightly but significantly reduced the [Ca2+](i) elevation. These results suggest that Epo increased [Ca2+](i) in cortical neurons by inducing Ca2+ entry in the control condition but decreased [Ca2+](i) in the Mg2+-free excitotoxic condition, at least in part via PI3K-dependent activation of Ca-activated K channels. Reduction of [Ca2+](i) by Epo in the excitotoxic condition may contribute to neuroprotection. (C) 2011 Elsevier B.V. All rights reserved.
- リンク情報
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- DOI
- https://doi.org/10.1016/j.brainres.2011.02.077
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/21376708
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000290509300002&DestApp=WOS_CPL
- URL
- http://orcid.org/0000-0001-9790-9867
- ID情報
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- DOI : 10.1016/j.brainres.2011.02.077
- ISSN : 0006-8993
- ORCIDのPut Code : 19789368
- PubMed ID : 21376708
- Web of Science ID : WOS:000290509300002