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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/28026

Title: Integration of CNS survival and differentiation by HIF2α
Authors: Ching-Yi Ko;Ming-Yuan Tsai;Wen-Fang Tseng;Chia-Hsiung Cheng;Chi-Ruei Huang;Jian-Shiung Wu;Hsin-Yu Chung;Cho-Shuen Hsieh;Chi-Kuang Sun;Sheng-Ping L. Hwang;Chiou-Hwa Yuh;Chang-Jen Huang;Tun-Wen Pai
Contributors: NTOU:Department of Computer Science and Engineering
國立臺灣海洋大學:資訊工程學系
Keywords: HIF2α;survivin;neural progenitor cells;apoptosis;differentiation
Date: 2011-05
Issue Date: 2011-10-21T02:35:16Z
Publisher: Cell Death and Differentiation
Abstract: Abstract:Hypoxia-inducible factor (HIF) 1α and -2α and the inhibitor of apoptosis survivin represent prominent markers of many human cancers. They are also widely expressed in various embryonic tissues, including the CNS; however, little is known about their functions in embryos. Here, we show that zebrafish HIF2α protects neural progenitor cells and neural differentiation processes by up-regulating the survivin orthologues birc5a and birc5b during embryogenesis. Morpholino-mediated knockdown of hif2α reduced the transcription of birc5a and birc5b, induced p53-independent apoptosis and abrogated neural cell differentiation. Depletion of birc5a and birc5b recaptured the neural development defects that were observed in the hif2α morphants. The phenotypes induced by HIF2α depletion were largely rescued by ectopic birc5a and birc5b mRNAs, indicating that Birc5a and Birc5b act downstream of HIF2α. Chromatin immunoprecipitation assay revealed that HIF2α binds to birc5a and birc5b promoters directly to modulate their transcriptions. Knockdown of hif2α, birc5a or -5b reduced the expression of the cdk inhibitors p27/cdkn1b and p57/cdkn1c and increased ccnd1/cyclin D1 transcription in the surviving neural progenitor cells. The reduction in elavl3/HuC expression and enhanced pcna, nestin, ascl1b and sox3 expression indicate that the surviving neural progenitor cells in hif2α morphants maintain a high proliferation rate without terminally differentiating. We propose that a subset of developmental defects attributed to HIF2α depletion is due in part to the loss of survivin activity.
Relation: 3(11), pp.1-14
URI: http://ntour.ntou.edu.tw/handle/987654321/28026
Appears in Collections:[資訊工程學系] 期刊論文

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