Glucose-based regulation of miR-451/AMPK signaling depends on the OCT1 transcription factor.

Glucose-based regulation of miR-451/AMPK signaling depends on the OCT1 transcription factor.
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DOI:
10.1016/j.celrep.2015.04.016
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发表时间:
2015-05-12
期刊:
影响因子:
8.8
通讯作者:
Godlewski J
Godlewski J
中科院分区:
生物学1区
文献类型:
--
作者:
Ansari KI;Ogawa D;Rooj AK;Lawler SE;Krichevsky AM;Johnson MD;Chiocca EA;Bronisz A;Godlewski J

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在侵袭性、快速生长的实体肿瘤中,如多形性胶质母细胞瘤(GBM),癌细胞面临着微环境频繁的动态变化,包括葡萄糖和其他营养物质的可用性。这些挑战要求肿瘤细胞具有适应能力,以便在营养/能量缺乏的时期存活下来。我们已经确定了一个反向负反馈回路机制,其中microRNA-451 (miR-451)的水平通过AMPK对其直接转录激活子OCT1的磷酸化和失活而受到负调控,AMPK被葡萄糖消耗诱导的代谢应激激活。相反,在富含葡萄糖的环境中,miR-451的无约束表达会抑制AMPK通路的活性。这些发现揭示了miR-451是葡萄糖调节的AMPK信号的主要效应器,允许肿瘤细胞适应肿瘤微环境中营养可用性的变化。
In aggressive, rapidly growing solid tumors such as glioblastoma multiforme (GBM), cancer cells face frequent dynamic changes in their microenvironment including the availability of glucose and other nutrients. These challenges require that tumor cells have the ability to adapt in order to survive periods of nutrient/energy starvation. We have identified a reciprocal negative feedback loop mechanism in which the levels of microRNA-451 (miR-451) are negatively regulated through the phosphorylation and inactivation of its direct transcriptional activator OCT1 by AMPK, which is activated by glucose depletion-induced metabolic stress. Conversely, in a glucose rich environment, unrestrained expression of miR-451 suppresses AMPK pathway activity. These findings uncover miR-451 as a major effector of glucose-regulated AMPK signaling, allowing tumor cell adaptation to variations in nutrient availability in the tumor microenvironment.
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