GPT2 Is Induced by Hypoxia-Inducible Factor (HIF)-2 and Promotes Glioblastoma Growth.

GPT2 Is Induced by Hypoxia-Inducible Factor (HIF)-2 and Promotes Glioblastoma Growth.
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GPT 2由缺氧诱导因子(HIF)-2诱导并促进胶质母细胞瘤生长。

DOI:
10.3390/cells11162597
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发表时间:
2022-08-20
期刊:
影响因子:
6
通讯作者:
Luo, Weibo
Luo, Weibo
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang, Bo;Chen, Yan;Bao, Lei;Luo, Weibo

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缺氧诱导因子(HIF)直接激活代谢酶的转录以响应缺氧,从而重新编程肿瘤细胞增殖所需的细胞代谢。通过分析谷氨酸连接的转氨酶,我们确定谷氨酸丙酮酸转氨酶 2 (GPT2) 是人胶质母细胞瘤 (GBM) 中的直接 HIF-2 靶基因。缺氧上调 GBM 细胞中的 GPT2 mRNA 和蛋白水平,这需要 HIF-2 而不是 HIF-1。 HIF-2直接与人类GPT2基因的缺氧反应元件结合,导致其在缺氧GBM细胞中转录。 GPT2 位于细胞核和线粒体,可降低 GBM 细胞中的 α-酮戊二酸水平。 GPT2 的遗传或药理学抑制可降低常氧和缺氧条件下 GBM 细胞的生长和迁移。 GPT2 的敲除抑制了小鼠 GBM 肿瘤的生长。总的来说,这些发现揭示了 GBM 进展所需的缺氧诱导转氨酶 GPT2。
Hypoxia-inducible factor (HIF) directly activates the transcription of metabolic enzymes in response to hypoxia to reprogram cellular metabolism required for tumor cell proliferation. Through analyzing glutamate-linked aminotransferases, we here identified glutamate pyruvate transaminase 2 (GPT2) as a direct HIF-2 target gene in human glioblastoma (GBM). Hypoxia upregulated GPT2 mRNA and protein levels in GBM cells, which required HIF-2 but not HIF-1. HIF-2 directly bound to the hypoxia response element of the human GPT2 gene, leading to its transcription in hypoxic GBM cells. GPT2 located at the nucleus and mitochondria and reduced α-ketoglutarate levels in GBM cells. Genetic or pharmacological inhibition of GPT2 decreased GBM cell growth and migration under normoxia and hypoxia. Knockout of GPT2 inhibited GBM tumor growth in mice. Collectively, these findings uncover a hypoxia-inducible aminotransferase GPT2 required for GBM progression.
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