Articles de revues : « Transcription factor EB (TFEB) »

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Nezich, Catherine L., Chunxin Wang, Adam I. Fogel et Richard J. Youle. « MiT/TFE transcription factors are activated during mitophagy downstream of Parkin and Atg5 ». Journal of Cell Biology 210, n^o 3 (3 août 2015) : 435–50. http://dx.doi.org/10.1083/jcb.201501002.

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The kinase PINK1 and ubiquitin ligase Parkin can regulate the selective elimination of damaged mitochondria through autophagy (mitophagy). Because of the demand on lysosomal function by mitophagy, we investigated a role for the transcription factor EB (TFEB), a master regulator of lysosomal biogenesis, in this process. We show that during mitophagy TFEB translocates to the nucleus and displays transcriptional activity in a PINK1- and Parkin-dependent manner. MITF and TFE3, homologues of TFEB belonging to the same microphthalmia/transcription factor E (MiT/TFE) family, are similarly regulated during mitophagy. Unlike TFEB translocation after starvation-induced mammalian target of rapamycin complex 1 inhibition, Parkin-mediated TFEB relocalization required Atg9A and Atg5 activity. However, constitutively active Rag guanosine triphosphatases prevented TFEB translocation during mitophagy, suggesting cross talk between these two MiT/TFE activation pathways. Analysis of clustered regularly interspaced short palindromic repeats–generated TFEB/MITF/TFE3/TFEC single, double, and triple knockout cell lines revealed that these proteins partly facilitate Parkin-mediated mitochondrial clearance. These results illuminate a pathway leading to MiT/TFE transcription factor activation, distinct from starvation-induced autophagy, which occurs during mitophagy.

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Markby, Greg Robert, et Kei Sakamoto. « Transcription factor EB and TFE3 : new metabolic coordinators mediating adaptive responses to exercise in skeletal muscle ? » American Journal of Physiology-Endocrinology and Metabolism 319, n^o 4 (1 octobre 2020) : E763—E768. http://dx.doi.org/10.1152/ajpendo.00339.2020.

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In response to the increased energy demands of contractions, skeletal muscle adapts remarkably well through acutely regulating metabolic pathways to maintain energy balance and in the longer term by regulating metabolic reprogramming, such as remodeling and expanding the mitochondrial network. This long-term adaptive response involves modulation of gene expression at least partly through the regulation of specific transcription factors and transcriptional coactivators. The AMPK-peroxisome proliferator-activated receptor γ coactivator 1α (PGC1α) pathway has long been known to orchestrate contraction-mediated adaptive responses, although AMPK- and PGC1α-independent pathways have also been proposed. Transcription factor EB (TFEB) and TFE3, known as important regulators of lysosomal biogenesis and autophagic processes, have emerged as new metabolic coordinators. The activity of TFEB/TFE3 is regulated through posttranslational modifications (i.e., phosphorylation) and spatial organization. Under nutrient and energy stress, TFEB and TFE3 are dephosphorylated and translocate to the nucleus, where they activate transcription of their target genes. It has recently been reported that exercise promotes nuclear translocation and activation of TFEB/TFE3 in mouse skeletal muscle through the Ca2+-stimulated protein phosphatase calcineurin. Skeletal muscle-specific ablation of TFEB exhibits impaired glucose homeostasis and mitochondrial biogenesis with reduced metabolic flexibility during exercise, and global TFE3 depletion results in diminished endurance and abolished exercise-induced metabolic benefits. Transcriptomic analysis of the muscle-specific TFEB-null mice has demonstrated that TFEB regulates the expression of genes involved in glucose metabolism and mitochondrial homeostasis. This review aims to summarize and discuss emerging roles for TFEB/TFE3 in metabolic and adaptive responses to exercise and contractile activity in skeletal muscle.

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Dang, Thao Thi, et Sung Hoon Back. « Translation Inhibitors Activate Autophagy Master Regulators TFEB and TFE3 ». International Journal of Molecular Sciences 22, n^o 21 (8 novembre 2021) : 12083. http://dx.doi.org/10.3390/ijms222112083.

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The autophagy-lysosome pathway is a major protein degradation pathway stimulated by multiple cellular stresses, including nutrient or growth factor deprivation, hypoxia, misfolded proteins, damaged organelles, and intracellular pathogens. Recent studies have revealed that transcription factor EB (TFEB) and transcription factor E3 (TFE3) play a pivotal role in the biogenesis and functions of autophagosome and lysosome. Here we report that three translation inhibitors (cycloheximide, lactimidomycin, and rocaglamide A) can facilitate the nuclear translocation of TFEB/TFE3 via dephosphorylation and 14-3-3 dissociation. In addition, the inhibitor-mediated TFEB/TFE3 nuclear translocation significantly increases the transcriptional expression of their downstream genes involved in the biogenesis and function of autophagosome and lysosome. Furthermore, we demonstrated that translation inhibition increased autophagosome biogenesis but impaired the degradative autolysosome formation because of lysosomal dysfunction. These results highlight the previously unrecognized function of the translation inhibitors as activators of TFEB/TFE3, suggesting a novel biological role of translation inhibition in autophagy regulation.

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Wundersitz, Sebastian, Cristina Pablo Tortola, Sibylle Schmidt, Ramon Oliveira Vidal, Melanie Kny, Alexander Hahn, Lukas Zanders et al. « The Transcription Factor EB (TFEB) Sensitizes the Heart to Chronic Pressure Overload ». International Journal of Molecular Sciences 23, n^o 11 (25 mai 2022) : 5943. http://dx.doi.org/10.3390/ijms23115943.

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The transcription factor EB (TFEB) promotes protein degradation by the autophagy and lysosomal pathway (ALP) and overexpression of TFEB was suggested for the treatment of ALP-related diseases that often affect the heart. However, TFEB-mediated ALP induction may perturb cardiac stress response. We used adeno-associated viral vectors type 9 (AAV9) to overexpress TFEB (AAV9-Tfeb) or Luciferase-control (AAV9-Luc) in cardiomyocytes of 12-week-old male mice. Mice were subjected to transverse aortic constriction (TAC, 27G; AAV9-Luc: n = 9; AAV9-Tfeb: n = 14) or sham (AAV9-Luc: n = 9; AAV9-Tfeb: n = 9) surgery for 28 days. Heart morphology, echocardiography, gene expression, and protein levels were monitored. AAV9-Tfeb had no effect on cardiac structure and function in sham animals. TAC resulted in compensated left ventricular hypertrophy in AAV9-Luc mice. AAV9-Tfeb TAC mice showed a reduced LV ejection fraction and increased left ventricular diameters. Morphological, histological, and real-time PCR analyses showed increased heart weights, exaggerated fibrosis, and higher expression of stress markers and remodeling genes in AAV9-Tfeb TAC compared to AAV9-Luc TAC. RNA-sequencing, real-time PCR and Western Blot revealed a stronger ALP activation in the hearts of AAV9-Tfeb TAC mice. Cardiomyocyte-specific TFEB-overexpression promoted ALP gene expression during TAC, which was associated with heart failure. Treatment of ALP-related diseases by overexpression of TFEB warrants careful consideration.

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Su, Qian, Bin Zheng, Chen-yao Wang, Yun-zhi Yang, Wen-wen Luo, Shu-min Ma, Xin-hua Zhang et al. « Oxidative Stress Induces Neuronal Apoptosis Through Suppressing Transcription Factor EB Phosphorylation at Ser467 ». Cellular Physiology and Biochemistry 46, n^o 4 (2018) : 1536–54. http://dx.doi.org/10.1159/000489198.

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Background/Aims: This study determined the role and mechanism of action of transcription factor EB (TFEB) in H2O2-induced neuronal apoptosis. Methods: SH-SY5Y cells were treated with Akt inhibitor/activator and different concentrations of H2O2. Cell apoptosis was detected by flow cytometric analysis. Akt and TFEB phosphorylation and PARP cleavage were determined by Western blotting. HEK293T cells were transfected with different truncated TFEB mutants and HA-Akt-WT; SH-SY5Y cells were transfected with Flag-vector, Flag-TFEB, Flag-TFEB-S467A or Flag-TFEB-S467D; and TFEB interaction with Akt was determined by co-immunoprecipitation and GST pull-down assays. Results: A low concentration of H2O2 induces TFEB phosphorylation at Ser467 and nuclear translocation, facilitating neuronal survival, whereas a high concentration of H2O2 promotes SH-SY5Y cell apoptosis via suppressing TFEB Ser467 phosphorylation and nuclear translocation. The TFEB-S467D mutant is more easily translocated into the nucleus than the non-phosphorylated TFEB-S467A mutant. Further, Akt physically binds to TFEB via its C-terminal tail interaction with the HLH domain of TFEB and phosphorylates TFEB at Ser467. Mutation of TFEB-Ser467 can prevent the phosphorylation of TFEB by Akt, preventing inhibition of oxidative stress-induced apoptosis. Conclusions: Oxidative stress induces neuronal apoptosis through suppressing TFEB phosphorylation at Ser467 by Akt, providing a novel therapeutic strategy for neurodegenerative diseases.

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Chang, Jin-Zhe, Shu-Dong Chen, Hui Zheng et Hua-Ping Zhang. « Downregulation of transcription factor EB inhibits the growth and metastasis of colorectal carcinomas ». European Journal of Inflammation 16 (janvier 2018) : 205873921880533. http://dx.doi.org/10.1177/2058739218805333.

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To determine the roles of transcription factor EB (TFEB) in colorectal cancer (CRC), we collected samples of tumor tissues and normal tissues from 40 patients with CRC. The expression of TFEB in these samples was analyzed by using quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot. Furthermore, we explored the expression of TFEB mRNA in CCD-18Co normal cells and HT-29, HCT-8, C2BBe1 cancer cells. HT-29, HCT-8, and C2BBe1 cancer cells were transfected with a TFEB-specific small interference RNA (siRNA) and scrambled siRNA, then the TFEB expression was confirmed by Western blot. The migration and invasion abilities of cells transfected with TFEB-siRNA were examined by transwell method and wound-healing assay. The subsequent effect of TFEB silencing on the tumor growth was also detected in mice xenograft model in vivo. Our study found that TFEB expression was significantly increased ( P < 0.05) in colorectal tumor tissues compared with normal tissues. Consistent with TFEB expression in tissues, compared with the normal CCD-18Co cells, TFEB mRNA expression was also significantly augmented in CRC cells. TFEB protein expression was markedly reduced in HT-29, HCT-8, and C2BBe1 cells after TFEB-siRNA transfection. In addition, inhibition of TFEB expression resulted in decrease of cells migration and invasion abilities. In vivo study, compared with the negative control group, the tumor weight, and volume were also reduced after inhibiting the TFEB expression. Our research suggested that TFEB expression is related to the occurrence and development of colorectal adenocarcinoma. The migration and invasion abilities of cancer cells, the weight and volume of tumor were all decreased when inhibiting TFEB expression. Thus, TFEB serves as an important factor in the development of CRC by modulating cancer cell migration and invasion, showing the potential therapeutic target of CRC in clinical.

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Argüello, Graciela, Elisa Balboa, Pablo J. Tapia, Juan Castro, María José Yañez, Pamela Mattar, Rodrigo Pulgar et Silvana Zanlungo. « Genistein Activates Transcription Factor EB and Corrects Niemann–Pick C Phenotype ». International Journal of Molecular Sciences 22, n^o 8 (19 avril 2021) : 4220. http://dx.doi.org/10.3390/ijms22084220.

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Niemann–Pick type C disease (NPCD) is a lysosomal storage disease (LSD) characterized by abnormal cholesterol accumulation in lysosomes, impaired autophagy flux, and lysosomal dysfunction. The activation of transcription factor EB (TFEB), a master lysosomal function regulator, reduces the accumulation of lysosomal substrates in LSDs where the degradative capacity of the cells is compromised. Genistein can pass the blood–brain barrier and activate TFEB. Hence, we investigated the effect of TFEB activation by genistein toward correcting the NPC phenotype. We show that genistein promotes TFEB translocation to the nucleus in HeLa TFEB-GFP, Huh7, and SHSY-5Y cells treated with U18666A and NPC1 patient fibroblasts. Genistein treatment improved lysosomal protein expression and autophagic flux, decreasing p62 levels and increasing those of the LC3-II in NPC1 patient fibroblasts. Genistein induced an increase in β-hexosaminidase activity in the culture media of NPC1 patient fibroblasts, suggesting an increase in lysosomal exocytosis, which correlated with a decrease in cholesterol accumulation after filipin staining, including cells treated with U18666A and NPC1 patient fibroblasts. These results support that genistein-mediated TFEB activation corrects pathological phenotypes in NPC models and substantiates the need for further studies on this isoflavonoid as a potential therapeutic agent to treat NPCD and other LSDs with neurological compromise.

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Corà, Davide, Federico Bussolino et Gabriella Doronzo. « TFEB Signalling-Related MicroRNAs and Autophagy ». Biomolecules 11, n^o 7 (4 juillet 2021) : 985. http://dx.doi.org/10.3390/biom11070985.

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The oncogenic Transcription Factor EB (TFEB), a member of MITF-TFE family, is known to be the most important regulator of the transcription of genes responsible for the control of lysosomal biogenesis and functions, autophagy, and vesicles flux. TFEB activation occurs in response to stress factors such as nutrient and growth factor deficiency, hypoxia, lysosomal stress, and mitochondrial damage. To reach the final functional status, TFEB is regulated in multimodal ways, including transcriptional rate, post-transcriptional regulation, and post-translational modifications. Post-transcriptional regulation is in part mediated by miRNAs. miRNAs have been linked to many cellular processes involved both in physiology and pathology, such as cell migration, proliferation, differentiation, and apoptosis. miRNAs also play a significant role in autophagy, which exerts a crucial role in cell behaviour during stress or survival responses. In particular, several miRNAs directly recognise TFEB transcript or indirectly regulate its function by targeting accessory molecules or enzymes involved in its post-translational modifications. Moreover, the transcriptional programs triggered by TFEB may be influenced by the miRNA-mediated regulation of TFEB targets. Finally, recent important studies indicate that the transcription of many miRNAs is regulated by TFEB itself. In this review, we describe the interplay between miRNAs with TFEB and focus on how these types of crosstalk affect TFEB activation and cellular functions.

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Wang, Shujun, Yanse Chen, Hongluan Wu, Xiaoyu Li, Haiyan Xiao, Qingjun Pan et Hua-Feng Liu. « Role of Transcription Factor EB in Mitochondrial Dysfunction of Cisplatin-Induced Acute Kidney Injury ». International Journal of Molecular Sciences 24, n^o 3 (3 février 2023) : 3028. http://dx.doi.org/10.3390/ijms24033028.

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Cisplatin, a widely used anticancer agent, can cause nephrotoxicity, including both acute kidney injury (AKI) and chronic kidney diseases, by accumulating in renal tubular epithelial cells (TECs). Mitochondrial pathology plays an important role in the pathogenesis of AKI. Based on the regulatory role of transcription factor EB (TFEB) in mitochondria, we investigated whether TFEB is involved in cisplatin-induced TEC damage. The results show that the expression of TFEB decreased in a concentration-dependent manner in both mouse kidney tissue and HK-2 cells when treated with cisplatin. A knockdown of TFEB aggravated cisplatin-induced renal TEC injury, which was partially reversed by TFEB overexpression in HK-2 cells. It was further observed that the TFEB knockdown also exacerbated cisplatin-induced mitochondrial damage in vitro, and included the depolarization of membrane potential, mitochondrial fragmentation and swelling, and the production of reactive oxygen species. In contrast, TFEB overexpression alleviated cisplatin-induced mitochondrial damage in TECs. These findings suggest that decreased TFEB expression may be a key mechanism of mitochondrial dysfunction in cisplatin-induced AKI, and that upregulation of TFEB has the potential to act as a therapeutic target to alleviate mitochondrial dysfunction and cisplatin-induced TEC injury. This study is important for developing therapeutic strategies to manipulate mitochondria through TFEB to delay AKI progression.

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Alcalde, Alejandra Diaz, Edoardo Vallariello, Elena Astanina, Emanuele Middonti et Federico Bussolino. « Abstract 2355 : Transcription factor EB modulates fibrotic response in pancreatic ductal adenocarcinoma ». Cancer Research 83, n^o 7_Supplement (4 avril 2023) : 2355. http://dx.doi.org/10.1158/1538-7445.am2023-2355.

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Abstract Pancreatic ductal adenocarcinoma (PDAC), which comprises 85% of all the pancreatic cancers, is one of the most aggressive and deadly tumor that exists today with less than 8% of survival 5 years after diagnosis. It is predicted to become the second cause of cancer death by 2030. A typical characteristic of this tumor is the presence of prominent stroma component mainly produced by Pancreatic Stellate Cells (PSCs) in response to soluble factors released by cancer cells. PSCs activation and differentiation into CAF (Cancer-associated fibroblasts) is a reversible process, which impacts on both tumor progression and drug resistance. Transcription factor EB (TFEB) is mostly known as a master regulator of autophagy and lysosomal biogenesis. A recent study demonstrated that TFEB inhibits epithelial-to-mesenchymal transition (EMT) and myofibroblast differentiation in epicardial cells by upregulating TGIF1, a TGFβ pathway repressor. Based on this observation, we investigated if TFEB might have an inhibitory role in PSCs activation, taking into consideration the crucial role of TGFβ signaling in this process. The TFEB expression, measured by immunostaining, was significantly downregulated in CAFs in human PDAC samples compared to PSCs in healthy pancreas. In PSCs, co-cultured with PDAC cell lines, CAF markers were upregulated while TFEB expression was downregulated. The overexpression of TFEB in PSCs suppressed CAF markers upregulation induced by co-culture with PDAC cells at both mRNA and protein levels. The bulk RNAseq analysis showed the differential expression of genes required for extracellular matrix production, fibrotic response and inflammation in PSCs co-cultured with PDAC cell lines versus PSCs alone, with and without TFEB overexpression. These in vitro data suggest a role for TFEB in PSCs activation and stroma formation which will be further investigated in PDAC mouse models. Citation Format: Alejandra Diaz Alcalde, Edoardo Vallariello, Elena Astanina, Emanuele Middonti, Federico Bussolino. Transcription factor EB modulates fibrotic response in pancreatic ductal adenocarcinoma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 2355.

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Bartlett, Jordan J., Purvi C. Trivedi, Pollen Yeung, Petra C. Kienesberger et Thomas Pulinilkunnil. « Doxorubicin impairs cardiomyocyte viability by suppressing transcription factor EB expression and disrupting autophagy ». Biochemical Journal 473, n^o 21 (27 octobre 2016) : 3769–89. http://dx.doi.org/10.1042/bcj20160385.

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Doxorubicin (DOX) is an effective anti-cancer agent. However, DOX treatment increases patient susceptibility to dilated cardiomyopathy. DOX predisposes cardiomyocytes to insult by suppressing mitochondrial energy metabolism, altering calcium flux, and disrupting proteolysis and proteostasis. Prior studies have assessed the role of macroautophagy in DOX cardiotoxicity; however, limited studies have examined whether DOX mediates cardiac injury through dysfunctions in inter- and/or intra-lysosomal signaling events. Lysosomal signaling and function is governed by transcription factor EB (TFEB). In the present study, we hypothesized that DOX caused myocyte injury by impairing lysosomal function and signaling through negative regulation of TFEB. Indeed, we found that DOX repressed cellular TFEB expression, which was associated with impaired cathepsin proteolytic activity across in vivo, ex vivo, and in vitro models of DOX cardiotoxicity. Furthermore, we observed that loss of TFEB was associated with reduction in macroautophagy protein expression, inhibition of autophagic flux, impairments in lysosomal cathepsin B activity, and activation of cell death. Restoration and/or activation of TFEB in DOX-treated cardiomyocytes prevented DOX-induced suppression of cathepsin B activity, reduced DOX-mediated reactive oxygen species (ROS) overproduction, attenuated activation of caspase-3, and improved cellular viability. Collectively, loss of TFEB inhibits lysosomal autophagy, rendering cardiomyocytes susceptible to DOX-induced proteotoxicity and injury. Our data reveal a novel mechanism wherein DOX primes cardiomyocytes for cell death by depleting cellular TFEB.

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Cesana, Marcella, Gennaro Tufano, Francesco Panariello, Nicolina Zampelli, Susanna Ambrosio, Rossella De Cegli, Margherita Mutarelli et al. « EGR1 drives cell proliferation by directly stimulating TFEB transcription in response to starvation ». PLOS Biology 21, n^o 3 (8 mars 2023) : e3002034. http://dx.doi.org/10.1371/journal.pbio.3002034.

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The stress-responsive transcription factor EB (TFEB) is a master controller of lysosomal biogenesis and autophagy and plays a major role in several cancer-associated diseases. TFEB is regulated at the posttranslational level by the nutrient-sensitive kinase complex mTORC1. However, little is known about the regulation of TFEB transcription. Here, through integrative genomic approaches, we identify the immediate-early gene EGR1 as a positive transcriptional regulator of TFEB expression in human cells and demonstrate that, in the absence of EGR1, TFEB-mediated transcriptional response to starvation is impaired. Remarkably, both genetic and pharmacological inhibition of EGR1, using the MEK1/2 inhibitor Trametinib, significantly reduced the proliferation of 2D and 3D cultures of cells displaying constitutive activation of TFEB, including those from a patient with Birt-Hogg-Dubé (BHD) syndrome, a TFEB-driven inherited cancer condition. Overall, we uncover an additional layer of TFEB regulation consisting in modulating its transcription via EGR1 and propose that interfering with the EGR1-TFEB axis may represent a therapeutic strategy to counteract constitutive TFEB activation in cancer-associated conditions.

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Fan, Yanbo, Haocheng Lu, Wenying Liang, Minerva T. Garcia-Barrio, Yanhong Guo, Ji Zhang, Tianqing Zhu, Yibai Hao, Jifeng Zhang et Y. Eugene Chen. « Endothelial TFEB (Transcription Factor EB) Positively Regulates Postischemic Angiogenesis ». Circulation Research 122, n^o 7 (30 mars 2018) : 945–57. http://dx.doi.org/10.1161/circresaha.118.312672.

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Ma, Xiucui, Haiyan Liu, John T. Murphy, Sarah R. Foyil, Rebecca J. Godar, Haedar Abuirqeba, Carla J. Weinheimer, Philip M. Barger et Abhinav Diwan. « Regulation of the Transcription Factor EB-PGC1α Axis by Beclin-1 Controls Mitochondrial Quality and Cardiomyocyte Death under Stress ». Molecular and Cellular Biology 35, n^o 6 (5 janvier 2015) : 956–76. http://dx.doi.org/10.1128/mcb.01091-14.

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In cardiac ischemia-reperfusion injury, reactive oxygen species (ROS) generation and upregulation of the hypoxia-inducible protein BNIP3 result in mitochondrial permeabilization, but impairment in autophagic removal of damaged mitochondria provokes programmed cardiomyocyte death. BNIP3 expression and ROS generation result in upregulation of beclin-1, a protein associated with transcriptional suppression of autophagy-lysosome proteins and reduced activation of transcription factor EB (TFEB), a master regulator of the autophagy-lysosome machinery. Partial beclin-1 knockdown transcriptionally stimulates lysosome biogenesis and autophagy via mTOR inhibition and activation of TFEB, enhancing removal of depolarized mitochondria. TFEB activation concomitantly stimulates mitochondrial biogenesis via PGC1α induction to restore normally polarized mitochondria and attenuate BNIP3- and hypoxia-reoxygenation-induced cell death. Conversely, overexpression of beclin-1 activates mTOR to inhibit TFEB, resulting in declines in lysosome numbers and suppression of PGC1α transcription. Importantly, knockdown of endogenous TFEB or PGC1α results in a complete or partial loss, respectively, of the cytoprotective effects of partial beclin-1 knockdown, indicating a critical role for both mitochondrial autophagy and biogenesis in ensuring cellular viability. These studies uncover a transcriptional feedback loop for beclin-1-mediated regulation of TFEB activation and implicate a central role for TFEB in coordinating mitochondrial autophagy with biogenesis to restore normally polarized mitochondria and prevent ischemia-reperfusion-induced cardiomyocyte death.

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Chen, Mingyue, Yashuang Dai, Siyu Liu, Yuxin Fan, Zongxian Ding et Dan Li. « TFEB Biology and Agonists at a Glance ». Cells 10, n^o 2 (5 février 2021) : 333. http://dx.doi.org/10.3390/cells10020333.

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Autophagy is a critical regulator of cellular survival, differentiation, development, and homeostasis, dysregulation of which is associated with diverse diseases including cancer and neurodegenerative diseases. Transcription factor EB (TFEB), a master transcriptional regulator of autophagy and lysosome, can enhance autophagic and lysosomal biogenesis and function. TFEB has attracted a lot of attention owing to its ability to induce the intracellular clearance of pathogenic factors in a variety of disease models, suggesting that novel therapeutic strategies could be based on the modulation of TFEB activity. Therefore, TFEB agonists are a promising strategy to ameliorate diseases implicated with autophagy dysfunction. Recently, several TFEB agonists have been identified and preclinical or clinical trials are applied. In this review, we present an overview of the latest research on TFEB biology and TFEB agonists.

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Peña, Karina A., et Kirill Kiselyov. « Transition metals activate TFEB in overexpressing cells ». Biochemical Journal 470, n^o 1 (6 août 2015) : 65–76. http://dx.doi.org/10.1042/bj20140645.

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Exposure of cells to micromolar Cu activates recombinant transcription factor EB (TFEB), leading to expression of the lysosomal network genes. Whereas TFEB overexpression has a cytoprotective effect under moderate Cu exposure, it enhances oxidative stress and mitochondrial damage caused by high levels of Cu.

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Martina, Jose A., et Rosa Puertollano. « Rag GTPases mediate amino acid–dependent recruitment of TFEB and MITF to lysosomes ». Journal of Cell Biology 200, n^o 4 (11 février 2013) : 475–91. http://dx.doi.org/10.1083/jcb.201209135.

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The mTORC1 complex supports cell growth and proliferation in response to energy levels, growth factors, and nutrients. The Rag guanosine triphosphatases (GTPases) activate mTORC1 in response to amino acids by promoting its redistribution to lysosomes. In this paper, we identify a novel role for Rags in controlling activation of transcription factor EB (TFEB), a master regulator of autophagic and lysosomal gene expression. Interaction of TFEB with active Rag heterodimers promoted recruitment of TFEB to lysosomes, leading to mTORC1-dependent phosphorylation and inhibition of TFEB. The interaction of TFEB with Rags required the first 30 residues of TFEB and the switch regions of the Rags G domain. Depletion or inactivation of Rags prevented recruitment of TFEB to lysosomes, whereas expression of active Rags induced association of TFEB with lysosomal membranes. Finally, Rag GTPases bound and regulated activation of microphthalmia-associated transcription factor, suggesting a broader role for Rags in the control of gene expression. Our work provides new insight into the molecular mechanisms that link nutrient availability and TFEB localization and activation.

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Wang, Hongjie, Ruizhi Wang, Shaohua Xu et Madepalli K. Lakshmana. « Transcription Factor EB Is Selectively Reduced in the Nuclear Fractions of Alzheimer’s and Amyotrophic Lateral Sclerosis Brains ». Neuroscience Journal 2016 (28 juin 2016) : 1–8. http://dx.doi.org/10.1155/2016/4732837.

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Multiple studies suggest that autophagy is strongly dysregulated in Alzheimer’s disease (AD) and amyotrophic lateral sclerosis (ALS), as evidenced by accumulation of numerous autophagosomes, lysosomes with discontinuous membranes, and aggregated proteins in the patients’ brains. Transcription factor EB (TFEB) was recently discovered to be a master regulator of lysosome biogenesis and autophagy. To examine whether aberrant autophagy in AD and ALS is due to alterations in TFEB expression, we systematically quantified the levels of TFEB in these brains by immunoblotting. Interestingly, cytoplasmic fractions of AD brains showed increased levels of normalized (to tubulin) TFEB only at Braak stage IV (61%, p<0.01). Most importantly, normalized (to lamin) TFEB levels in the nuclear fractions were consistently reduced starting from Braak stage IV (52%, p<0.01), stage V (67%, p<0.01), and stage VI (85%, p<0.01) when compared to normal control (NC) brains. In the ALS brains also, nuclear TFEB levels were reduced by 62% (p<0.001). These data suggest that nuclear TFEB is selectively lost in ALS as well as AD brains, in which TFEB reduction was Braak-stage-dependent. Taken together, the observed reductions in TFEB protein levels may be responsible for the widely reported autophagy defects in these disorders.

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Wang, Shujun, Kaipeng Jing, Hongluan Wu, Xiaoyu Li, Chen Yang, Tingting Li, Haoxuan Tang, Ting Zou, Yao She et Hua-feng Liu. « Activation of Transcription Factor EB Alleviates Tubular Epithelial Cell Injury via Restoring Lysosomal Homeostasis in Diabetic Nephropathy ». Oxidative Medicine and Cellular Longevity 2022 (12 janvier 2022) : 1–24. http://dx.doi.org/10.1155/2022/2812493.

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Disruption of lysosomal homeostasis contributes to the tubulopathy of diabetic nephropathy; however, its underlying mechanisms remain unclear. Herein, we report that decreased activity of transcription factor EB (TFEB) is responsible for the disturbed lysosome biogenesis and clearance in this pathological process. This was confirmed by the findings that insufficient lysosomal replenishment and damaged lysosomal clearance coincided with TFEB inactivation, which was mediated by mTOR hyperactivation in the renal tubular epithelial cells (TECs) of diabetic nephropathy. Furthermore, either TFEB overexpression or pharmacological activation of TFEB enhanced lysosomal clearance via promoting lysosomal biogenesis and protected TECs by reducing apoptosis in vitro. In addition, pharmacological activation of TFEB attenuated renal tubule injury, apoptosis, and inflammation in db/db mice. In conclusion, diabetes-induced mTOR activation represses TFEB function, thereby perturbing lysosomal homeostasis through impairing lysosomal biogenesis and clearance in TECs. Moreover, TFEB activation protects TECs from diabetic injuries via restoring lysosomal homeostasis.

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Kim, Soyoung, Gahyeon Song, Taebok Lee, Minseong Kim, Jeongrae Kim, Hyeryun Kwon, Jiyoung Kim et al. « PARsylated transcription factor EB (TFEB) regulates the expression of a subset of Wnt target genes by forming a complex with β-catenin-TCF/LEF1 ». Cell Death & ; Differentiation 28, n^o 9 (22 mars 2021) : 2555–70. http://dx.doi.org/10.1038/s41418-021-00770-7.

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AbstractWnt signaling is mainly transduced by β-catenin via regulation of the β-catenin destruction complex containing Axin, APC, and GSK3β. Transcription factor EB (TFEB) is a well-known master regulator of autophagy and lysosomal biogenesis processes. TFEB’s nuclear localization and transcriptional activity are also regulated by various upstream signals. In this study, we found that Wnt signaling induces the nuclear localization of TFEB and the expression of Wnt target genes is regulated by TFEB-β-catenin-TCF/LEF1 as well as β-catenin-TCF/LEF1 complexes. Our biochemical data revealed that TFEB is a part of the β-catenin destruction complex, and destabilization of the destruction complex by knockdown of either Axin or APC causes nuclear localization of TFEB. Interestingly, RNA-sequencing analysis revealed that about 27% of Wnt3a-induced genes were TFEB dependent. However, these “TFEB mediated Wnt target genes” were different from TFEB target genes involved in autophagy and lysosomal biogenesis processes. Mechanistically, we found that Tankyrase (TNKS) PARsylates TFEB with Wnt ON signaling, and the nuclear localized PARsylated TFEB forms a complex with β-catenin-TCF/LEF1 to induce the “TFEB mediated Wnt target genes”. Finally, we found that in various types of cancer, the levels of TFEB mediated Wnt target genes exhibit strong correlations with the level of Axin2, which represents the activity of Wnt signaling. Overall, our data suggest that Wnt signaling induces the expression of a subset of genes that are distinct from previously known genes regulated by the β-catenin-TCF/LEF1 complex or TFEB, by forming a transcription factor complex consisting of PARsylated TFEB and β-catenin-TCF/LEF1.

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Liu, Yan, Jing Li, Xianfeng Lu, Shuangping Zhen et Jing Huo. « Toll-Like Receptor 4 Exacerbates Mycoplasma pneumoniaevia Promoting Transcription Factor EB-Mediated Autophagy ». Contrast Media & ; Molecular Imaging 2022 (31 juillet 2022) : 1–9. http://dx.doi.org/10.1155/2022/3357694.

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Mycoplasma pneumoniae (M. pneumoniae) is the most common cause of community-acquired pneumonia. Toll-like receptors (TLRs) play an essential role in pneumonia. The purpose of this study was to investigate the roles of TLR4 in M. pneumoniae. Mice were administrated with 100 μl (1 × 107 ccu/ml) of M. pneumoniae. HE staining was applied for histological analysis. The protein expression was determined by western blot. The cytokine level was detected by ELISA. The results showed that TLR4-deficient mice were protected from M. pneumoniae. However, downregulation of TLR4 inhibited inflammatory response and autophagy. Moreover, transcription factor EB (TFEB) participated in M. pneumoniae-induced inflammatory response and autophagy, while knockdown of TLR4 downregulated TFEB and its nuclear translocation.

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La Spina, Martina, Michele Azzolini, Andrea Salmaso, Sofia Parrasia, Eva Galletta, Marco Schiavone, Martina Chrisam et al. « Multiple Mechanisms Converging on Transcription Factor EB Activation by the Natural Phenol Pterostilbene ». Oxidative Medicine and Cellular Longevity 2021 (28 décembre 2021) : 1–19. http://dx.doi.org/10.1155/2021/7658501.

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Pterostilbene (Pt) is a potentially beneficial plant phenol. In contrast to many other natural compounds (including the more celebrated resveratrol), Pt concentrations producing significant effects in vitro can also be reached with relative ease in vivo. Here we focus on some of the mechanisms underlying its activity, those involved in the activation of transcription factor EB (TFEB). A set of processes leading to this outcome starts with the generation of ROS, attributed to the interaction of Pt with complex I of the mitochondrial respiratory chain, and spreads to involve Ca2+ mobilization from the ER/mitochondria pool, activation of CREB and AMPK, and inhibition of mTORC1. TFEB migration to the nucleus results in the upregulation of autophagy and lysosomal and mitochondrial biogenesis. Cells exposed to several μM levels of Pt experience a mitochondrial crisis, an indication for using low doses in therapeutic or nutraceutical applications. Pt afforded significant functional improvements in a zebrafish embryo model of ColVI-related myopathy, a pathology which also involves defective autophagy. Furthermore, long-term supplementation with Pt reduced body weight gain and increased transcription levels of Ppargc1a and Tfeb in a mouse model of diet-induced obesity. These in vivo findings strengthen the in vitro observations and highlight the therapeutic potential of this natural compound.

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Li, Zhenyu, Guangqian Ding, Yudi Wang, Zelong Zheng et Jianping Lv. « Safety profile of the transcription factor EB (TFEB)-based gene therapy through intracranial injection in mice ». Translational Neuroscience 11, n^o 1 (15 juillet 2020) : 241–50. http://dx.doi.org/10.1515/tnsci-2020-0132.

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AbstractTranscription factor EB (TFEB)-based gene therapy is a promising therapeutic strategy in treating neurodegenerative diseases by promoting autophagy/lysosome-mediated degradation and clearance of misfolded proteins that contribute to the pathogenesis of these diseases. However, recent findings have shown that TFEB has proinflammatory properties, raising the safety concerns about its clinical application. To investigate whether TFEB induces significant inflammatory responses in the brain, male C57BL/6 mice were injected with phosphate-buffered saline (PBS), adeno-associated virus serotype 8 (AAV8) vectors overexpressing mouse TFEB (pAAV8-CMV-mTFEB), or AAV8 vectors expressing green fluorescent proteins (GFPs) in the barrel cortex. The brain tissue samples were collected at 2 months after injection. Western blotting and immunofluorescence staining showed that mTFEB protein levels were significantly increased in the brain tissue samples of mice injected with mTFEB-overexpressing vectors compared with those injected with PBS or GFP-overexpressing vectors. pAAV8-CMV-mTFEB injection resulted in significant elevations in the mRNA and protein levels of lysosomal biogenesis indicators in the brain tissue samples. No significant changes were observed in the expressions of GFAP, Iba1, and proinflammation mediators in the pAAV8-CMV-mTFEB-injected brain compared with those in the control groups. Collectively, our results suggest that AAV8 successfully mediates mTFEB overexpression in the mouse brain without inducing apparent local inflammation, supporting the safety of TFEB-based gene therapy in treating neurodegenerative diseases.

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Wang, Yun-Ting, Jiajie Chen, Xiang Li, Michihisa Umetani, Yang Chen, Pin-Lan Li et Yang Zhang. « Contribution of transcription factor EB to adipoRon-induced inhibition of arterial smooth muscle cell proliferation and migration ». American Journal of Physiology-Cell Physiology 317, n^o 5 (1 novembre 2019) : C1034—C1047. http://dx.doi.org/10.1152/ajpcell.00294.2019.

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Abnormal vascular smooth muscle cell (SMC) dedifferentiation with increased proliferation and migration during pathological vascular remodeling is associated with vascular disorders, such as atherosclerosis and in-stent restenosis. AdipoRon, a selective agonist of adiponectin receptor, has been shown to protect against vascular remodeling by preventing SMC dedifferentiation. However, the molecular mechanisms that mediate adipoRon-induced SMC differentiation are not well understood. The present study aimed to elucidate the role of transcription factor EB (TFEB), a master regulator of autophagy, in mediating adipoRon’s effect on SMCs. In cultured arterial SMCs, adipoRon dose-dependently increased TFEB activation, which is accompanied by upregulated transcription of genes involved in autophagy pathway and enhanced autophagic flux. In parallel, adipoRon suppressed serum-induced cell proliferation and caused cell cycle arrest. Moreover, adipoRon inhibited SMC migration as characterized by wound-healing retardation, F-actin reorganization, and matrix metalloproteinase-9 downregulation. These inhibitory effects of adipoRon on proliferation and migration were attenuated by TFEB gene silencing. Mechanistically, activation of TFEB by adipoRon is dependent on intracellular calcium, but it is not associated with changes in AMPK, ERK1/2, Akt, or molecular target of rapamycin complex 1 activation. Using ex vivo aortic explants, we demonstrated that adipoRon inhibited sprouts that had outgrown from aortic rings, whereas lentiviral TFEB shRNA transduction significantly reversed this effect of adipoRon on aortic rings. Taken together, our results indicate that adipoRon activates TFEB signaling that helps maintain the quiescent and differentiated status of arterial SMCs, preventing abnormal SMC dedifferentiation. This study provides novel mechanistic insights into understanding the therapeutic effects of adipoRon on TFEB signaling and pathological vascular remodeling.

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Yan, Shengmin. « Role of TFEB in Autophagy and the Pathogenesis of Liver Diseases ». Biomolecules 12, n^o 5 (6 mai 2022) : 672. http://dx.doi.org/10.3390/biom12050672.

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The transcription factor EB (TFEB) is a master regulator of lysosomal function and autophagy. Mechanistic target of rapamycin (mTOR)-mediated phosphorylation on TFEB is known to regulate TFEB subcellular localization and activity at the lysosomal surface. Recent studies have shown that TFEB also plays a critical role in physiological processes such as lipid metabolism, and dysfunction of TFEB has been observed in the pathogenesis of several diseases. Owing to its ability to improve disease status in murine models, TFEB has attracted attention as a therapeutic target for diseases. In this review, we will present the regulation of TFEB and its role in the pathogenesis of liver diseases, particularly non-alcoholic fatty liver disease (NAFLD).

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Lee, Sun-Jae, Young-Ah Kim et Kwan-Kyu Park. « Anti-Fibrotic Effect of Synthetic Noncoding Decoy ODNs for TFEB in an Animal Model of Chronic Kidney Disease ». International Journal of Molecular Sciences 23, n^o 15 (23 juillet 2022) : 8138. http://dx.doi.org/10.3390/ijms23158138.

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Despite emerging evidence suggesting that autophagy occurs during renal interstitial fibrosis, the role of autophagy activation in fibrosis and the mechanism by which autophagy influences fibrosis remain controversial. Transcription factor EB (TFEB) is a master regulator of autophagy-related gene transcription, lysosomal biogenesis, and autophagosome formation. In this study, we examined the preventive effects of TFEB suppression on renal fibrosis. We injected synthesized TFEB decoy oligonucleotides (ODNs) into the tail veins of unilateral ureteral obstruction (UUO) mice to explore the regulation of autophagy in UUO-induced renal fibrosis. The expression of interleukin (IL)-1β, tumor necrosis factor-α (TNF-α), and collagen was decreased by TFEB decoy ODN. Additionally, TEFB ODN administration inhibited the expression of microtubule-associated protein light chain 3 (LC3), Beclin1, and hypoxia-inducible factor-1α (HIF-1α). We confirmed that TFEB decoy ODN inhibited fibrosis and autophagy in a UUO mouse model. The TFEB decoy ODNs also showed anti-inflammatory effects. Collectively, these results suggest that TFEB may be involved in the regulation of autophagy and fibrosis and that regulating TFEB activity may be a promising therapeutic strategy against kidney diseases.

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Kim, Ji Hye, Jinyoung Lee, Young-Ra Cho, So-Yeon Lee, Gi-Jun Sung, Dong-Myung Shin, Kyung-Chul Choi et Jaekyoung Son. « TFEB Supports Pancreatic Cancer Growth through the Transcriptional Regulation of Glutaminase ». Cancers 13, n^o 3 (27 janvier 2021) : 483. http://dx.doi.org/10.3390/cancers13030483.

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Transcription factor EB (TFEB) is a master regulator of lysosomal function and autophagy. In addition, TFEB has various physiological roles such as nutrient sensing, cellular stress responses, and immune responses. However, the precise roles of TFEB in pancreatic cancer growth remain unclear. Here, we show that pancreatic cancer cells exhibit a significantly elevated TFEB expression compared with normal tissue samples and that the genetic inhibition of TFEB results in a significant inhibition in both glutamine and mitochondrial metabolism, which in turn suppresses the PDAC growth both in vitro and in vivo. High basal levels of autophagy are critical for pancreatic cancer growth. The TFEB knockdown had no significant effect on the autophagic flux under normal conditions but interestingly caused a profound reduction in glutaminase (GLS) transcription, leading to an inhibition of glutamine metabolism. We observed that the direct binding of TFEB to the GLS and TFEB gene promotors regulates the transcription of GLS. We also found that the glutamate supplementation leads to a significant recovery of the PDAC growth that had been reduced by a TFEB knockdown. Taken together, our current data demonstrate that TFEB supports the PDAC cell growth by regulating glutaminase-mediated glutamine metabolism.

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Jeong, Seokmin, Jun-Kyu Byun, Sung Cho, Jungwook Chin, In-Kyu Lee, Yeon-Kyung Choi et Keun-Gyu Park. « Transcription Factor Eb Is Required for Macropinocytosis-Mediated Growth Recovery of Nutrient-Deprived Kras-Mutant Cells ». Nutrients 10, n^o 11 (2 novembre 2018) : 1638. http://dx.doi.org/10.3390/nu10111638.

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Macropinocytosis is a regulated form of endocytosis that mediates the nonselective uptake of nutrients to support growth under nutrient-deprived conditions. KRAS-mutant cancer cells upregulate macropinocytosis to import extracellular proteins, which subsequently undergo proteolytic degradation in the lysosome. Although transcription factor EB (TFEB) is a master regulator of lysosomal biogenesis and function, its role in the degradation of extracellular protein from macropinocytosis in KRAS-mutant cells has not previously been elucidated. In this study, we investigated the role of TFEB in the recovery of macropinocytosis-mediated mTORC1 activity and cell growth under nutrient depletion. Mouse embryonic fibroblasts (MEFs) expressing KrasG12D and KRAS-mutant human cancer cells took up markedly higher levels of tetramethylrhodamine (TMR)-dextran than the corresponding wild-type cells. siRNA-mediated inhibition of TFEB did not influence extracellular TMR-dextran uptake, but significantly attenuated lysosomal degradation of extracellular protein. Bovine serum albumin (BSA) treatment restored p-S6K levels and cell proliferation suppressed by leucine deprivation, and these effects were blocked by siTFEB. Collectively, our results show that TFEB plays a role in macropinocytosis-mediated KRAS-mutant cell growth under nutrient deprivation by promoting lysosomal degradation of extracellular proteins.

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Liu, Cong, Dawang Zhou, Qiang Zhang, Hongyan Wei, Yuanzheng Lu, Bo Li, Haohong Zhan et al. « Transcription factor EB (TFEB) improves ventricular remodeling after myocardial infarction by inhibiting Wnt/β-catenin signaling pathway ». PeerJ 11 (18 août 2023) : e15841. http://dx.doi.org/10.7717/peerj.15841.

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Background Adverse left ventricular remodeling after myocardial infarction (MI) compromises cardiac function and increases heart failure risk. Until now, comprehension of the role transcription factor EB (TFEB) plays after MI is limited. Objectives The purpose of this study was to describe the effects of TFEB on fibroblasts differentiation and extracellular matrix expression after MI. Methods AAV9 (adeno-associated virus) mediated up- and down-regulated TFEB expressions were generated in C57BL/6 mice two weeks before the MI modeling. Echocardiography, Masson, Sirius red staining immunofluorescence, and wheat germ agglutinin staining were performed at 3 days, and 1, 2, and 4 weeks after MI modeling. Fibroblasts collected from SD neonatal rats were transfected by adenovirus and siRNA, and cell counting kit-8 (CCK8), immunofluorescence, wound healing and Transwell assay were conducted. Myocardial fibrosis-related proteins were identified by Western blot. PNU-74654 (100 ng/mL) was used for 12 hours to inhibit β-catenin-TCF/LEF1 complex. Results The up-regulation of TFEB resulted in reduced fibroblasts proliferation and its differentiation into myofibroblasts in vitro studies. A significant up-regulation of EF and down-regulation of myocyte area was shown in the AAV9-TFEB group. Meanwhile, decreased protein level of α-SMA and collagen I were observed in vitro study. TFEB didn’t affect the concentration of β-catenin. Inhibition of TFEB, which promoted cell migration, proliferation and collagen I expression, was counteracted by PNU-74654. Conclusions TFEB demonstrated potential in restraining fibrosis after MI by inhibiting the Wnt/β-catenin signaling pathway.

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Franco-Juárez, Berenice, Cristina Coronel-Cruz, Beatriz Hernández-Ochoa, Saúl Gómez-Manzo, Noemi Cárdenas-Rodríguez, Roberto Arreguin-Espinosa, Cindy Bandala, Luis Miguel Canseco-Ávila et Daniel Ortega-Cuellar. « TFEB ; Beyond Its Role as an Autophagy and Lysosomes Regulator ». Cells 11, n^o 19 (7 octobre 2022) : 3153. http://dx.doi.org/10.3390/cells11193153.

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Transcription factor EB (TFEB) is considered the master transcriptional regulator of autophagy and lysosomal biogenesis, which regulates target gene expression through binding to CLEAR motifs. TFEB dysregulation has been linked to the development of numerous pathological conditions; however, several other lines of evidence show that TFEB might be a point of convergence of diverse signaling pathways and might therefore modulate other important biological processes such as cellular senescence, DNA repair, ER stress, carbohydrates, and lipid metabolism and WNT signaling-related processes. The regulation of TFEB occurs predominantly at the post-translational level, including phosphorylation, acetylation, SUMOylating, PARsylation, and glycosylation. It is noteworthy that TFEB activation is context-dependent; therefore, its regulation is subjected to coordinated mechanisms that respond not only to nutrient fluctuations but also to stress cell programs to ensure proper cell homeostasis and organismal health. In this review, we provide updated insights into novel post-translational modifications that regulate TFEB activity and give an overview of TFEB beyond its widely known role in autophagy and the lysosomal pathway, thus opening the possibility of considering TFEB as a potential therapeutic target.

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Erlich, Avigail T., Diane M. Brownlee, Kaitlyn Beyfuss et David A. Hood. « Exercise induces TFEB expression and activity in skeletal muscle in a PGC-1α-dependent manner ». American Journal of Physiology-Cell Physiology 314, n^o 1 (1 janvier 2018) : C62—C72. http://dx.doi.org/10.1152/ajpcell.00162.2017.

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The mitochondrial network in muscle is controlled by the opposing processes of mitochondrial biogenesis and mitophagy. The coactivator peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) regulates biogenesis, while the transcription of mitophagy-related genes is controlled by transcription factor EB (TFEB). PGC-1α activation is induced by exercise; however, the effect of exercise on TFEB is not fully known. We investigated the interplay between PGC-1α and TFEB on mitochondria in response to acute contractile activity in C2C12 myotubes and following exercise in wild-type and PGC-1α knockout mice. TFEB nuclear localization was increased by 1.6-fold following 2 h of acute myotube contractile activity in culture, while TFEB transcription was also simultaneously increased by twofold to threefold. Viral overexpression of TFEB in myotubes increased PGC-1α and cytochrome- c oxidase-IV gene expression. In wild-type mice, TFEB translocation to the nucleus increased 2.4-fold in response to acute exercise, while TFEB transcription, assessed through the electroporation of a TFEB promoter construct, was elevated by fourfold. These exercise effects were dependent on the presence of PGC-1α. Our data indicate that acute exercise provokes TFEB expression and activation in a PGC-1α-dependent manner and suggest that TFEB, along with PGC-1α, is an important regulator of mitochondrial biogenesis in muscle as a result of exercise.

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Huang, Yi, Yan Chen, Amanda Marie Shaw, Howard Goldfine, Junqiang Tian et Jiyang Cai. « Enhancing TFEB-Mediated Cellular Degradation Pathways by the mTORC1 Inhibitor Quercetin ». Oxidative Medicine and Cellular Longevity 2018 (28 octobre 2018) : 1–9. http://dx.doi.org/10.1155/2018/5073420.

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Signaling pathways mediated by the mechanistic target of rapamycin (mTOR) play key roles in aging and age-related diseases. As a downstream protein of mTOR, transcription factor EB (TFEB) controls lysosome biogenesis and cellular trafficking, processes that are essential for the functions of phagocytic cells like the retinal pigment epithelium (RPE). In the current study, we show that a naturally occurring polyphenolic compound, quercetin, promoted TFEB nuclear translocation and enhanced its transcriptional activity in cultured RPE cells. Activated TFEB facilitated degradation of phagocytosed photoreceptor outer segments. Quercetin is a direct inhibitor of mTOR but did not influence the activity of Akt at the tested concentration range. Our data suggest that the dietary compound quercetin can have beneficial roles in neuronal tissues by improving the functions of the TFEB-lysosome axis and enhancing the capacities of cellular degradation and self-renewal.

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Moskot, Marta, Sandro Montefusco, Joanna Jakóbkiewicz-Banecka, Paweł Mozolewski, Alicja Węgrzyn, Diego Di Bernardo, Grzegorz Węgrzyn, Diego L. Medina, Andrea Ballabio et Magdalena Gabig-Cimińska. « The Phytoestrogen Genistein Modulates Lysosomal Metabolism and Transcription Factor EB (TFEB) Activation ». Journal of Biological Chemistry 289, n^o 24 (25 avril 2014) : 17054–69. http://dx.doi.org/10.1074/jbc.m114.555300.

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Li, Yuting, Xiang Ye, Xiaodong Zheng et Wei Chen. « Transcription factor EB (TFEB)-mediated autophagy protects against ethyl carbamate-induced cytotoxicity ». Journal of Hazardous Materials 364 (février 2019) : 281–92. http://dx.doi.org/10.1016/j.jhazmat.2018.10.037.

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Spampanato, Carmine, Erin Feeney, Lishu Li, Monica Cardone, Jeong‐A Lim, Fabio Annunziata, Hossein Zare et al. « Transcription factor EB (TFEB) is a new therapeutic target for Pompe disease ». EMBO Molecular Medicine 5, n^o 5 (18 avril 2013) : 691–706. http://dx.doi.org/10.1002/emmm.201202176.

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Wang, Ziying, Chuanbin Yang, Jia Liu, Benjamin Chun-Kit Tong, Zhou Zhu, Sandeep Malampati, Sravan Gopalkrishnashetty Sreenivasmurthy et al. « A Curcumin Derivative Activates TFEB and Protects Against Parkinsonian Neurotoxicity in Vitro ». International Journal of Molecular Sciences 21, n^o 4 (22 février 2020) : 1515. http://dx.doi.org/10.3390/ijms21041515.

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TFEB (transcription factor EB), which is a master regulator of autophagy and lysosome biogenesis, is considered to be a new therapeutic target for Parkinson’s disease (PD). However, only several small-molecule TFEB activators have been discovered and their neuroprotective effects in PD are unclear. In this study, a curcumin derivative, named E4, was identified as a potent TFEB activator. Compound E4 promoted the translocation of TFEB from cytoplasm into nucleus, accompanied by enhanced autophagy and lysosomal biogenesis. Moreover, TFEB knockdown effectively attenuated E4-induced autophagy and lysosomal biogenesis. Mechanistically, E4-induced TFEB activation is mainly through AKT-MTORC1 inhibition. In the PD cell models, E4 promoted the degradation of α-synuclein and protected against the cytotoxicity of MPP+ (1-methyl-4-phenylpyridinium ion) in neuronal cells. Overall, the TFEB activator E4 deserves further study in animal models of neurodegenerative diseases, including PD.

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Nakamura, Shuhei, Shiori Akayama et Tamotsu Yoshimori. « Non-canonical roles of ATG8 for TFEB activation ». Biochemical Society Transactions 50, n^o 1 (15 février 2022) : 47–54. http://dx.doi.org/10.1042/bst20210813.

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Autophagy is an evolutionally conserved cytoplasmic degradation pathway in which the double membrane structure, autophagosome sequesters cytoplasmic material and delivers them to lysosomes for degradation. Many autophagy related (ATG) proteins participate in the regulation of the several steps of autophagic process. Among ATGs, ubiquitin-like protein, ATG8 plays a pivotal role in autophagy. ATG8 is directly conjugated on lipid in autophagosome membrane upon induction of autophagy thus providing a good marker to monitor and analyze autophagy process. However, recent discoveries suggest that ATG8 has autophagy independent non-canonical functions and ATG8 positive structures are not always autophagosomes. This review briefly overviews canonical and non-canonical roles of ATG8 and introduce novel function of ATG8 to activate Transcriptional Factor EB(TFEB), a master transcription factor of autophagy and lysosome function during lysosomal damage.

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Takeuchi, Hiroki, Yuta Kato, Naoko Sasaki, Keita Tanigaki, Shunsuke Yamaga, Ena Mita, Masae Kuboniwa, Michiya Matsusaki et Atsuo Amano. « Surface pre-reacted glass-ionomer eluate protects gingival epithelium from penetration by lipopolysaccharides and peptidoglycans via transcription factor EB pathway ». PLOS ONE 17, n^o 7 (27 juillet 2022) : e0271192. http://dx.doi.org/10.1371/journal.pone.0271192.

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Surface pre-reacted glass-ionomer (S-PRG) filler, produced by PRG technology for use with various dental materials, is bioactive and known to release ions from a glass-ionomer phase. We previously reported that coxsackievirus and adenovirus receptor (CXADR), a tight junction associated protein, was located in the epithelial barrier of gingival epithelium. In the present study, the tissue protective effects of an S-PRG eluate prepared with S-PRG filler were investigated using a three-dimensional human gingival epithelial tissue model. The results showed that the S-PRG eluate specifically induced CXADR expression at the transcriptional level of messenger RNA as well as the protein level, and also nuclear translocation of transcription factor EB (TFEB) in gingival epithelial cells. Furthermore, shigyakusan, a TFEB inhibitor, canceled induction of the CXADR protein by the S-PRG eluate. Additionally, gingival epithelial permeation by 40-kDa dextran, lipopolysaccharide, and peptidoglycan in the 3D-tissue models was prevented by the eluate, with those effects abrogated by knockdown of CXADR. These findings suggest that S-PRG eluate increases CXADR expression via the TFEB pathway, thus inhibiting penetration of bacterial virulence factors into subepithelial tissues.

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Körholz, Katharina, Johannes Ridinger, Damir Krunic, Sara Najafi, Xenia F. Gerloff, Karen Frese, Benjamin Meder et al. « Broad-Spectrum HDAC Inhibitors Promote Autophagy through FOXO Transcription Factors in Neuroblastoma ». Cells 10, n^o 5 (24 avril 2021) : 1001. http://dx.doi.org/10.3390/cells10051001.

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Depending on context and tumor stage, deregulation of autophagy can either suppress tumorigenesis or promote chemoresistance and tumor survival. Histone deacetylases (HDACs) can modulate autophagy; however, the exact mechanisms are not fully understood. Here, we analyze the effects of the broad-spectrum HDAC inhibitors (HDACi) panobinostat and vorinostat on the transcriptional regulation of autophagy with respect to autophagy transcription factor activity (Transcription factor EB—TFEB, forkhead boxO—FOXO) and autophagic flux in neuroblastoma cells. In combination with the late-stage autophagic flux inhibitor bafilomycin A1, HDACis increase the number of autophagic vesicles, indicating an increase in autophagic flux. Both HDACi induce nuclear translocation of the transcription factors FOXO1 and FOXO3a, but not TFEB and promote the expression of pro-autophagic FOXO1/3a target genes. Moreover, FOXO1/3a knockdown experiments impaired HDACi treatment mediated expression of autophagy related genes. Combination of panobinostat with the lysosomal inhibitor chloroquine, which blocks autophagic flux, enhances neuroblastoma cell death in culture and hampers tumor growth in vivo in a neuroblastoma zebrafish xenograft model. In conclusion, our results indicate that pan-HDACi treatment induces autophagy in neuroblastoma at a transcriptional level. Combining HDACis with autophagy modulating drugs suppresses tumor growth of high-risk neuroblastoma cells. These experimental data provide novel insights for optimization of treatment strategies in neuroblastoma.

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Ma, Shumin, Zijun Fang, Wenwen Luo, Yunzhi Yang, Chenyao Wang, Qian Zhang, Huafei Wang, Huaiyong Chen, Chi bun Chan et Zhixue Liu. « The C-ETS2-TFEB Axis Promotes Neuron Survival under Oxidative Stress by Regulating Lysosome Activity ». Oxidative Medicine and Cellular Longevity 2016 (2016) : 1–16. http://dx.doi.org/10.1155/2016/4693703.

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Excessive reactive oxygen species/reactive nitrogen species (ROS/RNS) produced as a result of ageing causes damage to macromolecules and organelles or leads to interference of cell signalling pathways, which in turn results in oxidative stress. Oxidative stress occurs in many neurodegenerative diseases (e.g., Parkinson’s disease) and contributes to progressive neuronal loss. In this study, we show that cell apoptosis is induced by oxidative stress and that lysosomes play an important role in cell survival under oxidative stress. As a compensatory response to this stress, lysosomal genes were upregulated via induction of transcription factor EB (TFEB). In addition, localization of TFEB to the nucleus was increased by oxidative stress. We also confirmed that TFEB protects cells from oxidative stress both in vitro and in vivo. Finally, we found that C-ETS2 senses oxidative stress, activates TFEB transcription, and mediates the upregulation of lysosomal genes. Our results demonstrate a mechanistic pathway for inducing lysosomal activity during ageing and neurodegeneration.

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Curnock, Rachel, Alessia Calcagni, Andrea Ballabio et Peter J. Cullen. « TFEB controls retromer expression in response to nutrient availability ». Journal of Cell Biology 218, n^o 12 (6 novembre 2019) : 3954–66. http://dx.doi.org/10.1083/jcb.201903006.

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Endosomal recycling maintains the cell surface abundance of nutrient transporters for nutrient uptake, but how the cell integrates nutrient availability with recycling is less well understood. Here, in studying the recycling of human glutamine transporters ASCT2 (SLC1A5), LAT1 (SLC7A5), SNAT1 (SLC38A1), and SNAT2 (SLC38A2), we establish that following amino acid restriction, the adaptive delivery of SNAT2 to the cell surface relies on retromer, a master conductor of endosomal recycling. Upon complete amino acid starvation or selective glutamine depletion, we establish that retromer expression is upregulated by transcription factor EB (TFEB) and other members of the MiTF/TFE family of transcription factors through association with CLEAR elements in the promoters of the retromer genes VPS35 and VPS26A. TFEB regulation of retromer expression therefore supports adaptive nutrient acquisition through endosomal recycling.

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Vodicka, Petr, Kathryn Chase, Maria Iuliano, Adelaide Tousley, Dana T. Valentine, Ellen Sapp, Kimberly B. Kegel-Gleason, Miguel Sena-Esteves, Neil Aronin et Marian DiFiglia. « Autophagy Activation by Transcription Factor EB (TFEB) in Striatum of HDQ175/Q7 Mice ». Journal of Huntington's Disease 5, n^o 3 (1 octobre 2016) : 249–60. http://dx.doi.org/10.3233/jhd-160211.

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Yoneshima, Erika, Kuniaki Okamoto, Eiko Sakai, Kazuhisa Nishishita, Noriaki Yoshida et Takayuki Tsukuba. « The Transcription Factor EB (TFEB) Regulates Osteoblast Differentiation Through ATF4/CHOP-Dependent Pathway ». Journal of Cellular Physiology 231, n^o 6 (20 novembre 2015) : 1321–33. http://dx.doi.org/10.1002/jcp.25235.

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Boretto, Cecilia, Chiara Actis, Pawan Faris, Francesca Cordero, Marco Beccuti, Giulio Ferrero, Giuliana Muzio, Francesco Moccia et Riccardo Autelli. « Tamoxifen Activates Transcription Factor EB and Triggers Protective Autophagy in Breast Cancer Cells by Inducing Lysosomal Calcium Release : A Gateway to the Onset of Endocrine Resistance ». International Journal of Molecular Sciences 25, n^o 1 (29 décembre 2023) : 458. http://dx.doi.org/10.3390/ijms25010458.

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Among the several mechanisms accounting for endocrine resistance in breast cancer, autophagy has emerged as an important player. Previous reports have evidenced that tamoxifen (Tam) induces autophagy and activates transcription factor EB (TFEB), which regulates the expression of genes controlling autophagy and lysosomal biogenesis. However, the mechanisms by which this occurs have not been elucidated as yet. This investigation aims at dissecting how TFEB is activated and contributes to Tam resistance in luminal A breast cancer cells. TFEB was overexpressed and prominently nuclear in Tam-resistant MCF7 cells (MCF7-TamR) compared with their parental counterpart, and this was not dependent on alterations of its nucleo-cytoplasmic shuttling. Tam promoted the release of lysosomal Ca2+ through the major transient receptor potential cation channel mucolipin subfamily member 1 (TRPML1) and two-pore channels (TPCs), which caused the nuclear translocation and activation of TFEB. Consistently, inhibiting lysosomal calcium release restored the susceptibility of MCF7-TamR cells to Tam. Our findings demonstrate that Tam drives the nuclear relocation and transcriptional activation of TFEB by triggering the release of Ca2+ from the acidic compartment, and they suggest that lysosomal Ca2+ channels may represent new druggable targets to counteract the onset of autophagy-mediated endocrine resistance in luminal A breast cancer cells.

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Zhu, Xingxing, Xian Zhou, Chaofan Li, Yanfeng Li, Jie Sun, Ariel Raybuck, Mark Robin Boothby et Hu Zeng. « Rag GTPase critically contributes to humoral immunity independent of canonical mTORC1 signaling ». Journal of Immunology 208, n^o 1_Supplement (1 mai 2022) : 112.03. http://dx.doi.org/10.4049/jimmunol.208.supp.112.03.

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Abstract The humoral immune response requires that B cells undergo a rapid metabolic shift and high demand of nutrients, which are vital to sustain the formation of germinal center. Rag GTPase senses amino acid availability to activate mechanistic target of rapamycin complex 1(mTORC1) pathway and modulate the function of transcription factor EB (TFEB), a member of the microphthalmia (MiT/TFE) family of HLH-leucine zipper transcription factors. However, little is known about how Rag GTPase coordinates amino acid sensing, mTORC1 activation and TFEB activity in humoral immune response. Here, we show that B cell intrinsic Rag GTPase is critical to the development and activation of B cells. Disruption of Rag GTPase complex, but not mTORC1 complex, abrogates germinal center formation, antibody production as well as plasma cell generation upon respiratory influenza infection. Mechanistically, the Rag GTPase complex senses specific amino acids to suppress TFEB activity, independent of canonical mTORC1 activation. Collectively, our data support the idea that Rag GTPase critically contributes to humoral immunity partly through suppressing TFEB and it is largely not necessary for canonical mTORC1 signaling. Supported by Mayo Foundation for Medical Education and Research

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Zhang, Chunyan, Huan Yang, Liwei Pan, Guangfu Zhao, Ruofei Zhang, Tianci Zhang, Zhixiong Xiao et al. « Hepatitis B Virus X Protein (HBx) Suppresses Transcription Factor EB (TFEB) Resulting in Stabilization of Integrin Beta 1 (ITGB1) in Hepatocellular Carcinoma Cells ». Cancers 13, n^o 5 (9 mars 2021) : 1181. http://dx.doi.org/10.3390/cancers13051181.

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Hepatitis B virus (HBV) infection is a major etiological risk for the incidence of hepatocellular carcinoma (HCC), and HBV X protein (HBx) is essential for oncogenic transformation. It is not known that if HBx can sabotage the lysosomal system for transformation and tumorigenesis, or its mechanism if it does have an effect. Examining clinical data, we observed that the downregulation of lysosomal components and transcription factor EB (TFEB) was associated with a poor prognosis of HCC patients. In HCC cells, we found that expression of HBx suppressed TFEB, impaired biogenesis of autophagic-lysosome, and promoted cellular dissemination. HBx mediated downregulation of TFEB led to impairment of autophagic/lysosomal biogenesis and flux, and consequently, accumulation of integrin beta 1 (ITGB1) for motility of HCC cells. Conversely, TFEB, in a steady-state condition, through induction of lysosomal biogenesis restrained ITGB1 levels and limited mobility of HCC cells. Specifically, overexpression of TFEB upregulated and activated the cysteine proteases including cathepsin L (CTSL) to degrade ITGB1. Conversely, expression of cystatin A (CSTA) or cystatin B (CSTB), the cellular inhibitors of lysosomal cysteine proteinases, spared ITGB1 from degradation and promoted dissemination of HCC cells. Taken together, this study suggests a potential mechanism for HBV-mediated malignancy, showing that HBx mediated downregulation of TFEB leads to accumulation of ITGB1 for HCC cell migration.

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He, Xiu, Shi Chen, Chao Li, Jiaqi Ban, Yungeng Wei, Yangyang He, Fangwei Liu, Ying Chen et Jie Chen. « Trehalose Alleviates Crystalline Silica-Induced Pulmonary Fibrosis via Activation of the TFEB-Mediated Autophagy-Lysosomal System in Alveolar Macrophages ». Cells 9, n^o 1 (4 janvier 2020) : 122. http://dx.doi.org/10.3390/cells9010122.

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Silicosis is an occupational lung disease characterized by persistent inflammation and irreversible fibrosis. Crystalline silica (CS) particles are mainly phagocytized by alveolar macrophages (AMs), which trigger apoptosis, inflammation, and pulmonary fibrosis. Previously, we found that autophagy-lysosomal system dysfunction in AMs was involved in CS-induced inflammation and fibrosis. Induction of autophagy and lysosomal biogenesis by transcription factor EB (TFEB) nuclear translocation can rescue fibrotic diseases. However, the role of TFEB in silicosis is unknown. In this study, we found that CS induced TFEB nuclear localization and increased TFEB expression in macrophages both in vivo and in vitro. However, TFEB overexpression or treatment with the TFEB activator trehalose (Tre) alleviated lysosomal dysfunction and enhanced autophagic flux. It also reduced apoptosis, inflammatory cytokine levels, and fibrosis. Both pharmacologically inhibition of autophagy and TFEB knockdown in macrophages significantly abolished the antiapoptotic and anti-inflammatory effects elicited by either TFEB overexpression or Tre treatment. In conclusion, these results uncover a protective role of TFEB-mediated autophagy in silicosis. Our study suggests that restoration of autophagy-lysosomal function by Tre-induced TFEB activation may be a novel strategy for the treatment of silicosis.

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Kuiper, RP. « TFEB (transcription factor EB) ». Atlas of Genetics and Cytogenetics in Oncology and Haematology, n^o 3 (février 2011). http://dx.doi.org/10.4267/2042/38098.

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« Transcription factor EB (TFEB) ». Science-Business eXchange 6, n^o 18 (mai 2013) : 440. http://dx.doi.org/10.1038/scibx.2013.440.

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Doronzo, Gabriella, Elena Astanina et Federico Bussolino. « The Oncogene Transcription Factor EB Regulates Vascular Functions ». Frontiers in Physiology 12 (12 avril 2021). http://dx.doi.org/10.3389/fphys.2021.640061.

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Transcription factor EB (TFEB) represents an emerging player in vascular biology. It belongs to the bHLH-leucine zipper transcription factor microphthalmia family, which includes microphthalmia-associated transcription factor, transcription factor E3 and transcription factor EC, and is known to be deregulated in cancer. The canonical transcriptional pathway orchestrated by TFEB adapts cells to stress in all kinds of tissues by supporting lysosomal and autophagosome biogenesis. However, emerging findings highlight that TFEB activates other genetic programs involved in cell proliferation, metabolism, inflammation and immunity. Here, we first summarize the general principles and mechanisms by which TFEB activates its transcriptional program. Then, we analyze the current knowledge of TFEB in the vascular system, placing particular emphasis on its regulatory role in angiogenesis and on the involvement of the vascular unit in inflammation and atherosclerosis.

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