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Nnah IC, Wang B, Saqcena C, Weber GF, Bonder EM, Bagley D, De Cegli R, Napolitano G, Medina DL, Ballabio A, Dobrowolski R. TFEB-driven endocytosis coordinates MTORC1 signaling and autophagy. Autophagy 2018; 15:151-164. [PMID: 30145926 DOI: 10.1080/15548627.2018.1511504] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
The mechanistic target of rapamycin kinase complex 1 (MTORC1) is a central cellular kinase that integrates major signaling pathways, allowing for regulation of anabolic and catabolic processes including macroautophagy/autophagy and lysosomal biogenesis. Essential to these processes is the regulatory activity of TFEB (transcription factor EB). In a regulatory feedback loop modulating transcriptional levels of RRAG/Rag GTPases, TFEB controls MTORC1 tethering to membranes and induction of anabolic processes upon nutrient replenishment. We now show that TFEB promotes expression of endocytic genes and increases rates of cellular endocytosis during homeostatic baseline and starvation conditions. TFEB-mediated endocytosis drives assembly of the MTORC1-containing nutrient sensing complex through the formation of endosomes that carry the associated proteins RRAGD, the amino acid transporter SLC38A9, and activate AKT/protein kinase B (AKT p-T308). TFEB-induced signaling endosomes en route to lysosomes are induced by amino acid starvation and are required to dissociate TSC2, re-tether and activate MTORC1 on endolysosomal membranes. This study characterizes TFEB-mediated endocytosis as a critical process leading to activation of MTORC1 and autophagic function, thus identifying the importance of the dynamic endolysosomal system in cellular clearance. Abbreviations: CAD: central adrenergic tyrosine hydroxylase-expressing-a-differentiated; ChIP-seq: chromosome immunoprecipitation sequencing; DAPI: 4',6-diamidino-2-phenylindole; DMSO: dimethyl sulfoxide; EDTA: ethylenediaminetetraacetic acid; EEA1: early endosomal antigen 1; EGF: epidermal growth factor; FBS: fetal bovine serum; GFP: green fluorescent protein; GTPase: guanosine triphosphatase; HEK293T: human embryonic kidney 293 cells expressing a temperature-sensitive mutant of the SV40 large T antigen; LAMP: lysosomal-associated membrane protein; LYNUS: lysosomal nutrient-sensing complex; MAP1LC3/LC3: microtubule associated protein 1 light chain 3 alpha/beta; MTOR: mechanistic target of rapamycin kinase; MTORC: mechanistic target of rapamycin kinase complex; OE: overexpression; PH: pleckstrin homology; PtdIns(3,4,5)P3: phosphatidylinositol 3,4,5-trisphosphate; RRAGD: Ras related GTPase binding D; RHEB: Ras homolog enriched in brain; SLC38A9: solute carrier family 38 member 9; SQSTM1: sequestosome 1; TFEB: transcription factor EB; TSC2: tuberous sclerosis 2; TMR: tetramethylrhodamine; ULK1: unc-51 like kinase 1; WT: wild type.
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Affiliation(s)
- Israel C Nnah
- a Department of Biological Sciences , Rutgers University , Newark , NJ , USA
| | - Biao Wang
- a Department of Biological Sciences , Rutgers University , Newark , NJ , USA
| | - Chaitali Saqcena
- a Department of Biological Sciences , Rutgers University , Newark , NJ , USA
| | - Gregory F Weber
- a Department of Biological Sciences , Rutgers University , Newark , NJ , USA
| | - Edward M Bonder
- a Department of Biological Sciences , Rutgers University , Newark , NJ , USA
| | - Dustin Bagley
- b Telethon Institute of Genetics and Medicine (TIGEM) , Pozzuoli , Italy
| | - Rossella De Cegli
- b Telethon Institute of Genetics and Medicine (TIGEM) , Pozzuoli , Italy
| | - Gennaro Napolitano
- b Telethon Institute of Genetics and Medicine (TIGEM) , Pozzuoli , Italy
| | - Diego L Medina
- b Telethon Institute of Genetics and Medicine (TIGEM) , Pozzuoli , Italy
| | - Andrea Ballabio
- b Telethon Institute of Genetics and Medicine (TIGEM) , Pozzuoli , Italy.,c Medical Genetics, Department of Translational Medicine , Federico II University , Naples , Italy.,d Department of Molecular and Human Genetics , Baylor College of Medicine , Houston , TX , USA.,e Jan and Dan Duncan Neurological Research Institute , Texas Children Hospital , Houston , TX , USA
| | - Radek Dobrowolski
- a Department of Biological Sciences , Rutgers University , Newark , NJ , USA.,f Glenn Biggs Institute for Alzheimer's & Neurodegenerative Diseases , University of Texas Health Sciences Center , San Antonio , TX , USA.,g Department of Cell Systems and Anatomy , University of Texas Health San Antonio , San Antonio , TX , USA
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