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MITF-MIR211 轴是细胞应激过程中新型的自噬放大系统。

MITF-MIR211 axis is a novel autophagy amplifier system during cellular stress.

机构信息

a Sabanci University , Faculty of Engineering and Natural Sciences, Molecular Biology, Genetics and Bioengineering Program , Orhanli-Tuzla , Turkey.

b Council of Forensic Medicine , Ministry of Justice , Bahcelievler , Turkey.

出版信息

Autophagy. 2019 Mar;15(3):375-390. doi: 10.1080/15548627.2018.1531197. Epub 2018 Oct 16.

Abstract

Macroautophagy (autophagy) is an evolutionarily conserved recycling and stress response mechanism. Active at basal levels in eukaryotes, autophagy is upregulated under stress providing cells with building blocks such as amino acids. A lysosome-integrated sensor system composed of RRAG GTPases and MTOR complex 1 (MTORC1) regulates lysosome biogenesis and autophagy in response to amino acid availability. Stress-mediated inhibition of MTORC1 results in the dephosphorylation and nuclear translocation of the TFE/MITF family of transcriptional factors, and triggers an autophagy- and lysosomal-related gene transcription program. The role of family members TFEB and TFE3 have been studied in detail, but the importance of MITF proteins in autophagy regulation is not clear so far. Here we introduce for the first time a specific role for MITF in autophagy control that involves upregulation of MIR211. We show that, under stress conditions including starvation and MTOR inhibition, a MITF-MIR211 axis constitutes a novel feed-forward loop that controls autophagic activity in cells. Direct targeting of the MTORC2 component RICTOR by MIR211 led to the inhibition of the MTORC1 pathway, further stimulating MITF translocation to the nucleus and completing an autophagy amplification loop. In line with a ubiquitous function, MITF and MIR211 were co-expressed in all tested cell lines and human tissues, and the effects on autophagy were observed in a cell-type independent manner. Thus, our study provides direct evidence that MITF has rate-limiting and specific functions in autophagy regulation. Collectively, the MITF-MIR211 axis constitutes a novel and universal autophagy amplification system that sustains autophagic activity under stress conditions. Abbreviations: ACTB: actin beta; AKT: AKT serine/threonine kinase; AKT1S1/PRAS40: AKT1 substrate 1; AMPK: AMP-activated protein kinase; ATG: autophagy-related; BECN1: beclin 1; DEPTOR: DEP domain containing MTOR interacting protein; GABARAP: GABA type A receptor-associated protein; HIF1A: hypoxia inducible factor 1 subunit alpha; LAMP1: lysosomal associated membrane protein 1; MAP1LC3B/LC3B: microtubule associated protein 1 light chain 3 beta; MAPKAP1/SIN1: mitogen-activated protein kinase associated protein 1; MITF: melanogenesis associated transcription factor; MLST8: MTOR associated protein, LST8 homolog; MRE: miRNA response element; MTOR: mechanistic target of rapamycin kinase; MTORC1: MTOR complex 1; MTORC2: MTOR complex 2; PRR5/Protor 1: proline rich 5; PRR5L/Protor 2: proline rich 5 like; RACK1: receptor for activated C kinase 1; RPTOR: regulatory associated protein of MTOR complex 1; RICTOR: RPTOR independent companion of MTOR complex 2; RPS6KB/p70S6K: ribosomal protein S6 kinase; RT-qPCR: quantitative reverse transcription-polymerase chain reaction; SQSTM1: sequestosome 1; STK11/LKB1: serine/threonine kinase 11; TFE3: transcription factor binding to IGHM enhancer 3; TFEB: transcription factor EB; TSC1/2: TSC complex subunit 1/2; ULK1: unc-51 like autophagy activating kinase 1; UVRAG: UV radiation resistance associated; VIM: vimentin; VPS11: VPS11, CORVET/HOPS core subunit; VPS18: VPS18, CORVET/HOPS core subunit; WIPI1: WD repeat domain, phosphoinositide interacting 1.

摘要

自噬(自噬)是一种进化上保守的回收和应激反应机制。在真核生物中基本处于活跃状态,自噬在应激下上调,为细胞提供氨基酸等构建块。由 RRAG GTPases 和 MTORC1(MTORC1)组成的溶酶体整合传感器系统调节溶酶体生物发生和自噬,以响应氨基酸可用性。应激介导的 MTORC1 抑制导致 TFE/MITF 家族转录因子的去磷酸化和核易位,并触发自噬和溶酶体相关基因转录程序。TFEB 和 TFE3 家族成员的作用已被详细研究,但 MITF 蛋白在自噬调节中的重要性尚不清楚。在这里,我们首次介绍了 MITF 在自噬控制中的特定作用,涉及 MIR211 的上调。我们表明,在包括饥饿和 MTOR 抑制在内的应激条件下,MITF-MIR211 轴构成了一种新的正反馈环,控制细胞中的自噬活性。MIR211 直接靶向 MTORC2 成分 RICTOR,导致 MTORC1 途径的抑制,进一步刺激 MITF 向核易位,并完成自噬放大环。与普遍功能一致,MITF 和 MIR211 在所有测试的细胞系和人组织中均有共表达,并且在细胞类型中观察到对自噬的影响。因此,我们的研究提供了直接证据,表明 MITF 在自噬调节中具有限速和特定功能。总的来说,MITF-MIR211 轴构成了一种新的和普遍的自噬放大系统,可在应激条件下维持自噬活性。缩写:ACTB:肌动蛋白 beta;AKT:AKT 丝氨酸/苏氨酸激酶;AKT1S1/PRAS40:AKT1 底物 1;AMPK:AMP 激活的蛋白激酶;ATG:自噬相关;BECN1:自噬相关蛋白 1;DEPTO:DEP 域包含 MTOR 相互作用蛋白;GABARAP:GABA 型 A 受体相关蛋白;HIF1A:缺氧诱导因子 1 亚基 alpha;LAMP1:溶酶体相关膜蛋白 1;MAP1LC3B/LC3B:微管相关蛋白 1 轻链 3 beta;MAPKAP1/SIN1:丝裂原激活的蛋白激酶相关蛋白 1;MITF:黑色素生成相关转录因子;MLST8:MTOR 相关蛋白,LST8 同源物;MRE:miRNA 反应元件;MTOR:雷帕霉素靶蛋白激酶;MTORC1:MTOR 复合物 1;MTORC2:MTOR 复合物 2;PRR5/Protor 1:富含脯氨酸 5;PRR5L/Protor 2:富含脯氨酸 5 样;RACK1:激活蛋白激酶 C 受体 1;RPTOR:MTOR 复合物 1 的调节相关蛋白;RICTOR:MTORC2 独立伴侣的 RPTOR;RPS6KB/p70S6K:核糖体蛋白 S6 激酶;RT-qPCR:定量逆转录聚合酶链反应;SQSTM1:自噬体 1;STK11/LKB1:丝氨酸/苏氨酸激酶 11;TFE3:与 IGHM 增强子结合的转录因子 3;TFEB:转录因子 EB;TSC1/2:TSC 复合物亚基 1/2;ULK1:非典型丝氨酸/苏氨酸激酶 1;UVRAG:紫外线辐射抗性相关;VIM:波形蛋白;VPS11:VPS11,CORVET/HOPS 核心亚基;VPS18:VPS18,CORVET/HOPS 核心亚基;WIPI1:WD 重复域,磷酸肌醇相互作用蛋白 1。

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