Journal
FEBS LETTERS
Volume 582, Issue 16, Pages 2397-2401Publisher
WILEY
DOI: 10.1016/j.febslet.2008.05.048
Keywords
MicroRNA; hypoxia; ephrin-A3; neuronal pentraxin 1
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Shortage of oxygen is one of the prime stress conditions in tissues. In this study, we looked for microRNAs expressed during hypoxia and showed that miR-210 expression was upregulated in response to hypoxia in vitro and in vivo. An active form of the HIF-1 alpha induced the expression of miR-210, showing the involvement of the HIF-1 signaling pathway in miR-210 gene transcription. Furthermore, miR-210 was shown to bind to the predicted target sites of ephrin-A3 or neuronal pentraxin 1, causing repression in luciferase reporter activity. Contrary to the microRNA-mediated repression hypothesis, ephrin-A3 was expressed at very high levels in post-ischemic mouse hippocampus in vivo. Thus, the regulatory effects of miR-210 on its targets in vivo need to be further characterized. (C) 2008 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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