An SREBP-responsive microRNA operon contributes to a regulatory loop for intracellular lipid homeostasis.

An SREBP-responsive microRNA operon contributes to a regulatory loop for intracellular lipid homeostasis.
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DOI:
10.1016/j.cmet.2013.06.010
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发表时间:
2013-07-02
期刊:
影响因子:
29
通讯作者:
Osborne TF
Osborne TF
中科院分区:
生物学1区
文献类型:
--
作者:
Jeon TI;Esquejo RM;Roqueta-Rivera M;Phelan PE;Moon YA;Govindarajan SS;Esau CC;Osborne TF

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甾醇调节元件结合蛋白(SREBPs)已发展成为连接脂质合成与调节细胞生长和存活的其他途径的焦点。在这里,我们发现了一个由SREBP-2直接激活的多囊状微rna位点。编码的miR-182和miR-96分别负向调节Fbxw7和insg -2的表达,并且已知两者都负向影响核SREBP的积累。直接操纵miR通路会改变核SREBP水平和内源性脂质合成。因此,我们发现了一种新的调节细胞内脂质代谢的机制,这种机制是由一对miR的协同作用介导的,这对miR表达自相同的SREBP-2调节miR位点,并且每个miR靶向调节SREBP功能的多步骤途径中的不同蛋白质。这些研究揭示了miR“操纵子”类似于细菌调控系统中遗传控制的经典模型。
Sterol regulatory element binding proteins (SREBPs) have evolved as a focal point for linking lipid synthesis with other pathways that regulate cell growth and survival. Here, we have uncovered a polycistrionic micro-RNA locus that is activated directly by SREBP-2. Two of the encoded miRs, miR-182 and miR-96, negatively regulate expression of Fbxw7 and Insig-2 respectively, and both are known to negatively affect nuclear SREBP accumulation. Direct manipulation of this miR pathway alters nuclear SREBP levels and endogenous lipid synthesis. Thus, we have uncovered a new mechanism for regulation of intracellular lipid metabolism mediated by the concerted action of a pair of miRs that are expressed from the same SREBP-2 regulated miR locus and each targets a different protein of the multi-step pathway that regulates SREBP function. These studies reveal a miR “operon” analogous to the classic model for genetic control in bacterial regulatory systems.
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