Transcription factor EB is a protein that in humans is encoded by the TFEBgene.[1][2]
Function
TFEB is a master gene for lysosomalbiogenesis.[3] It encodes a transcription factor that coordinates expression of lysosomal hydrolases, membrane proteins and genes involved in autophagy.[3][4] Upon nutrient depletion and under aberrant lysosomal storage conditions such as in lysosomal storage diseases, TFEB translocates from the cytoplasm to the nucleus, resulting in the activation of its target genes.[3][4] TFEB overexpression in cultured cells induces lysosomal biogenesis, exocytosis and autophagy. [3][4][5] Viral-mediated TFEB overexpression in cellular and mouse models of lysosomal storage disorders and in common neurodegenerative diseases such as Huntington, Parkinson and Alzheimer diseases, resulted in intracellular clearance of accumulating molecules and rescue of disease phenotypes.[3][5][6][7][8] TFEB is activated by PGC1-alpha and promotes reduction of htt aggregation and neurotoxicity in a mouse model of Huntington disease.[9]
TFEB overexpression has been found in patients with renal cell carcinoma and pancreatic cancer and was shown to promote tumorogenesis via induction of varius oncogenic signals.[10][11][12]
Nuclear localization and activity of TFEB is inhibited by serine phosphorylation by mTORC1 and extracellular signal–regulated kinase 2 (ERK2). [4][13][14][15]
mTORC1 phosphorylation of TFEB occurs at the lysosomal surface, both of which are localized there by interaction with the Rag GTPases. Phosphorylated TFEB is then retained in the cytosol by interaction with 14-3-3 proteins.[14][16][15] These kinases are tuned to the levels of extracellular nutrients suggesting a coordination in regulation of autophagy and lysosomal biogenesis and partnership of two distinct cellular organelles.[4] Nutrient depletion induces TFEB dephosphorylation and subsequent nuclear translocation via the phosphatase calcineurin. [17]
TFEB nuclear export is mediated by CRM1 and is dependent on phosphorylation.[18][19]
TFEB is also a target of the protein kinase AKT/PKB.[20]AKT/PKB phosphorylates TFEB at serine 467 and inhibits TFEB nuclear translocation.[20] Pharmacological inhibition of AKT/PKB activates TFEB, promotes lysosome biogenesis and autophagy, and ameliorates neuropathology in a mouse model of Juvenile Batten disease.[20]
TFEB is activated in Trex1-deficient cells via inhibition of mTORC1 activity, resulting in an expanded lysosomal compartment.[21]
↑ 3.03.13.23.33.4Sardiello M, Palmieri M, di Ronza A, Medina DL, Valenza M, Gennarino VA, Di Malta C, Donaudy F, Embrione V, Polishchuk RS, Banfi S, Parenti G, Cattaneo E, Ballabio A (Jul 2009). "A gene network regulating lysosomal biogenesis and function". Science. 325 (5939): 473–7. doi:10.1126/science.1174447. PMID19556463.
↑Settembre C, De Cegli R, Mansueto G, Saha PK, Vetrini F, Visvikis O, Huynh T, Carissimo A, Palmer D, Klisch TJ, Wollenberg AC, Di Bernardo D, Chan L, Irazoqui JE, Ballabio A (Jun 2013). "TFEB controls cellular lipid metabolism through a starvation-induced autoregulatory loop". Nature Cell Biology. 15 (6): 647–58. doi:10.1038/ncb2718. PMID23604321.
↑Polito VA, Li H, Martini-Stoica H, Wang B, Yang L, Xu Y, Swartzlander DB, Palmieri M, di Ronza A, Lee VM, Sardiello M, Ballabio A, Zheng H (Sep 2014). "Selective clearance of aberrant tau proteins and rescue of neurotoxicity by transcription factor EB". EMBO Molecular Medicine. 6 (9): 1142–60. doi:10.15252/emmm.201303671. PMID25069841.
↑Decressac M, Mattsson B, Weikop P, Lundblad M, Jakobsson J, Björklund A (May 2013). "TFEB-mediated autophagy rescues midbrain dopamine neurons from α-synuclein toxicity". Proc Natl Acad Sci USA. 110 (19): 1817–26. doi:10.1073/pnas.1305623110. PMID23610405.
↑Calcagnì A, Kors L, Verschuren E, De Cegli R, Zampelli N, Nusco E, Confalonieri S, Bertalot G, Pece S, Settembre C, Malouf GG, Leemans JC, de Heer E, Salvatore M, Peters DJ, Di Fiore PP, Ballabio A (Sep 2016). "Modelling TFE renal cell carcinoma in mice reveals a critical role of WNT signaling". Elife. 5. doi:10.7554/eLife.17047. PMID27668431.
↑Perera RM, Stoykova S, Nicolay BN, Ross KN, Fitamant J, Boukhali M, Lengrand J, Deshpande V, Selig MK, Ferrone CR, Settleman J, Stephanopoulos G, Dyson NJ, Zoncu R, Ramaswamy S, Haas W, Bardeesy N (Aug 2015). "Transcriptional control of autophagy-lysosome function drives pancreatic cancer metabolism". Nature. 524 (7565): 361–5. doi:10.1038/nature14587. PMID26168401.
↑Settembre C, Zoncu R, Medina DL, Vetrini F, Erdin S, Erdin S, Huynh T, Ferron M, Karsenty G, Vellard MC, Facchinetti V, Sabatini DM, Ballabio A (Mar 2012). "A lysosome-to-nucleus signalling mechanism senses and regulates the lysosome via mTOR and TFEB". EMBO Journal. 31 (5): 1095–108. doi:10.1038/emboj.2012.32. PMID22343943.
Kuiper RP, Schepens M, Thijssen J, van Asseldonk M, van den Berg E, Bridge J, Schuuring E, Schoenmakers EF, van Kessel AG (Jul 2003). "Upregulation of the transcription factor TFEB in t(6;11)(p21;q13)-positive renal cell carcinomas due to promoter substitution". Human Molecular Genetics. 12 (14): 1661–9. doi:10.1093/hmg/ddg178. PMID12837690.
Argani P, Laé M, Hutchinson B, Reuter VE, Collins MH, Perentesis J, Tomaszewski JE, Brooks JS, Acs G, Bridge JA, Vargas SO, Davis IJ, Fisher DE, Ladanyi M (Feb 2005). "Renal carcinomas with the t(6;11)(p21;q12): clinicopathologic features and demonstration of the specific alpha-TFEB gene fusion by immunohistochemistry, RT-PCR, and DNA PCR". The American Journal of Surgical Pathology. 29 (2): 230–40. doi:10.1097/01.pas.0000146007.54092.37. PMID15644781.
Rual JF, Venkatesan K, Hao T, Hirozane-Kishikawa T, Dricot A, Li N, Berriz GF, Gibbons FD, Dreze M, Ayivi-Guedehoussou N, Klitgord N, Simon C, Boxem M, Milstein S, Rosenberg J, Goldberg DS, Zhang LV, Wong SL, Franklin G, Li S, Albala JS, Lim J, Fraughton C, Llamosas E, Cevik S, Bex C, Lamesch P, Sikorski RS, Vandenhaute J, Zoghbi HY, Smolyar A, Bosak S, Sequerra R, Doucette-Stamm L, Cusick ME, Hill DE, Roth FP, Vidal M (Oct 2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature. 437 (7062): 1173–8. doi:10.1038/nature04209. PMID16189514.
Pecciarini L, Cangi MG, Lo Cunsolo C, Macri' E, Dal Cin E, Martignoni G, Doglioni C (May 2007). "Characterization of t(6;11)(p21;q12) in a renal-cell carcinoma of an adult patient". Genes, Chromosomes & Cancer. 46 (5): 419–26. doi:10.1002/gcc.20422. PMID17285572.