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
中科院分区:
文献类型:
--
作者:
Ansari KI;Ogawa D;Rooj AK;Lawler SE;Krichevsky AM;Johnson MD;Chiocca EA;Bronisz A;Godlewski J
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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