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  1. Article ; Online: Beating the ER: novel insights into FAM134B function and regulation.

    De Leonibus, Chiara / Cinque, Laura / Settembre, Carmine

    The EMBO journal

    2020  Volume 39, Issue 5, Page(s) e104546

    Abstract: To maintain cellular homeostasis, the endoplasmic reticulum (ER) necessitates a continuous removal of ER fragments via a selective, receptor-mediated, form of autophagy known as ER-phagy. In this issue of The EMBO Journal, Jiang et al (2020) shed light ... ...

    Abstract To maintain cellular homeostasis, the endoplasmic reticulum (ER) necessitates a continuous removal of ER fragments via a selective, receptor-mediated, form of autophagy known as ER-phagy. In this issue of The EMBO Journal, Jiang et al (2020) shed light on how the best characterized autophagy receptor FAM134B mediates ER membrane fragmentation, the earliest event during ER-phagy. They propose a dynamic model for FAM134B protein oligomerization and ER membrane scission, which are driven by CAMK2B-mediated phosphorylation of the receptor and are altered in sensory neuropathy.
    MeSH term(s) Autophagy ; Carrier Proteins ; Endoplasmic Reticulum ; Homeostasis ; Membrane Proteins
    Chemical Substances Carrier Proteins ; Membrane Proteins
    Language English
    Publishing date 2020-02-19
    Publishing country England
    Document type Journal Article ; Comment
    ZDB-ID 586044-1
    ISSN 1460-2075 ; 0261-4189
    ISSN (online) 1460-2075
    ISSN 0261-4189
    DOI 10.15252/embj.2020104546
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Transcriptional Regulation of Autophagy: Mechanisms and Diseases.

    Di Malta, Chiara / Cinque, Laura / Settembre, Carmine

    Frontiers in cell and developmental biology

    2019  Volume 7, Page(s) 114

    Abstract: Macro (Autophagy) is a catabolic process that relies on the cooperative function of two organelles: the lysosome and the autophagosome. The recent discovery of a transcriptional gene network that co-regulates the biogenesis and function of these two ... ...

    Abstract Macro (Autophagy) is a catabolic process that relies on the cooperative function of two organelles: the lysosome and the autophagosome. The recent discovery of a transcriptional gene network that co-regulates the biogenesis and function of these two organelles, and the identification of transcription factors, miRNAs and epigenetic regulators of autophagy, demonstrated that this catabolic process is controlled by both transcriptional and post-transcriptional mechanisms. In this review article, we discuss the nuclear events that control autophagy, focusing particularly on the role of the MiT/TFE transcription factor family. In addition, we will discuss evidence suggesting that the transcriptional regulation of autophagy could be targeted for the treatment of human genetic diseases, such as lysosomal storage disorders (LSDs) and neurodegeneration.
    Language English
    Publishing date 2019-07-02
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2737824-X
    ISSN 2296-634X
    ISSN 2296-634X
    DOI 10.3389/fcell.2019.00114
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Emerging lysosomal pathways for quality control at the endoplasmic reticulum.

    De Leonibus, Chiara / Cinque, Laura / Settembre, Carmine

    FEBS letters

    2019  Volume 593, Issue 17, Page(s) 2319–2329

    Abstract: Protein misfolding occurring in the endoplasmic reticulum (ER) might eventually lead to aggregation and cellular distress, and is a primary pathogenic mechanism in multiple human disorders. Mammals have developed evolutionary-conserved quality control ... ...

    Abstract Protein misfolding occurring in the endoplasmic reticulum (ER) might eventually lead to aggregation and cellular distress, and is a primary pathogenic mechanism in multiple human disorders. Mammals have developed evolutionary-conserved quality control mechanisms at the level of the ER. The best characterized is the ER-associated degradation (ERAD) pathway, through which misfolded proteins translocate from the ER to the cytosol and are subsequently proteasomally degraded. However, increasing evidence indicates that additional quality control mechanisms apply for misfolded ER clients that are not eligible for ERAD. This review focuses on the alternative, ERAD-independent, mechanisms of clearance of misfolded polypeptides from the ER. These processes, collectively referred to as ER-to-lysosome-associated degradation, involve ER-phagy, microautophagy or vesicular transport. The identification of the underlying molecular mechanisms is particularly important for developing new therapeutic approaches for human diseases associated with protein aggregate formation.
    MeSH term(s) Animals ; Autophagy ; Disease ; Endoplasmic Reticulum/metabolism ; Humans ; Lysosomes/metabolism
    Language English
    Publishing date 2019-08-13
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 212746-5
    ISSN 1873-3468 ; 0014-5793
    ISSN (online) 1873-3468
    ISSN 0014-5793
    DOI 10.1002/1873-3468.13571
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Emerging lysosomal pathways for quality control at the endoplasmic reticulum

    De Leonibus, Chiara / Cinque, Laura / Settembre, Carmine

    FEBS letters. 2019 Sept., v. 593, no. 17

    2019  

    Abstract: Protein misfolding occurring in the endoplasmic reticulum (ER) might eventually lead to aggregation and cellular distress, and is a primary pathogenic mechanism in multiple human disorders. Mammals have developed evolutionary‐conserved quality control ... ...

    Abstract Protein misfolding occurring in the endoplasmic reticulum (ER) might eventually lead to aggregation and cellular distress, and is a primary pathogenic mechanism in multiple human disorders. Mammals have developed evolutionary‐conserved quality control mechanisms at the level of the ER. The best characterized is the ER‐associated degradation (ERAD) pathway, through which misfolded proteins translocate from the ER to the cytosol and are subsequently proteasomally degraded. However, increasing evidence indicates that additional quality control mechanisms apply for misfolded ER clients that are not eligible for ERAD. This review focuses on the alternative, ERAD‐independent, mechanisms of clearance of misfolded polypeptides from the ER. These processes, collectively referred to as ER‐to‐lysosome–associated degradation, involve ER‐phagy, microautophagy or vesicular transport. The identification of the underlying molecular mechanisms is particularly important for developing new therapeutic approaches for human diseases associated with protein aggregate formation.
    Keywords cytosol ; distress ; endoplasmic reticulum ; humans ; polypeptides ; protein folding ; quality control ; therapeutics
    Language English
    Dates of publication 2019-09
    Size p. 2319-2329.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note REVIEW
    ZDB-ID 212746-5
    ISSN 1873-3468 ; 0014-5793
    ISSN (online) 1873-3468
    ISSN 0014-5793
    DOI 10.1002/1873-3468.13571
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Autophagy gets to the bone.

    Cinque, Laura / Forrester, Alison / Settembre, Carmine

    Cell cycle (Georgetown, Tex.)

    2016  Volume 15, Issue 7, Page(s) 871–872

    MeSH term(s) Autophagy ; Bone and Bones ; Cartilage ; Chondrocytes ; Collagen ; Humans
    Chemical Substances Collagen (9007-34-5)
    Language English
    Publishing date 2016-03-03
    Publishing country United States
    Document type Editorial ; Comment
    ZDB-ID 2146183-1
    ISSN 1551-4005 ; 1538-4101 ; 1554-8627
    ISSN (online) 1551-4005
    ISSN 1538-4101 ; 1554-8627
    DOI 10.1080/15384101.2016.1151724
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Defective collagen proteostasis and matrix formation in the pathogenesis of lysosomal storage disorders.

    Settembre, Carmine / Cinque, Laura / Bartolomeo, Rosa / Di Malta, Chiara / De Leonibus, Chiara / Forrester, Alison

    Matrix biology : journal of the International Society for Matrix Biology

    2018  Volume 71-72, Page(s) 283–293

    Abstract: The lysosome is a catabolic organelle devoted to the degradation of cellular components, such as protein complexes and whole or portion of organelles that reach the lysosomes through (macro)autophagy. The lysosomes also function as signaling organelles ... ...

    Abstract The lysosome is a catabolic organelle devoted to the degradation of cellular components, such as protein complexes and whole or portion of organelles that reach the lysosomes through (macro)autophagy. The lysosomes also function as signaling organelles by controlling the activity of key metabolic kinases, such as the mechanistic target of Rapamycin complex 1 (mTORC1). Lysosome dysfunction has dramatic consequences on cellular homeostasis and causes lysosomal storage disorders (LSDs). Here we review the recently proposed mechanisms by which impairment of lysosome/autophagy pathway affects extracellular matrix formation and skeletal development and growth. In particular, we will highlight the role of autophagy as a collagen quality control pathway in collagen-producing cells. An impairment of autophagy, such as the one observed in LSDs, leads to a collagen proteostatic defects and can explain, at least in part, the skeletal phenotypes characterizing patients with lysosomal storage disorders.
    MeSH term(s) Animals ; Autophagy ; Collagen/metabolism ; Extracellular Matrix/metabolism ; Humans ; Lysosomal Storage Diseases/metabolism ; Mechanistic Target of Rapamycin Complex 1/metabolism ; Phenotype ; Proteostasis
    Chemical Substances Collagen (9007-34-5) ; Mechanistic Target of Rapamycin Complex 1 (EC 2.7.11.1)
    Language English
    Publishing date 2018-06-02
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1183793-7
    ISSN 1569-1802 ; 0945-053X
    ISSN (online) 1569-1802
    ISSN 0945-053X
    DOI 10.1016/j.matbio.2018.06.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: TFEB and TFE3 drive kidney cystogenesis and tumorigenesis.

    Di Malta, Chiara / Zampelli, Angela / Granieri, Letizia / Vilardo, Claudia / De Cegli, Rossella / Cinque, Laura / Nusco, Edoardo / Pece, Salvatore / Tosoni, Daniela / Sanguedolce, Francesca / Sorrentino, Nicolina Cristina / Merino, Maria J / Nielsen, Deborah / Srinivasan, Ramaprasad / Ball, Mark W / Ricketts, Christopher J / Vocke, Cathy D / Lang, Martin / Karim, Baktiar /
    Lanfrancone, Luisa / Schmidt, Laura S / Linehan, W Marston / Ballabio, Andrea

    EMBO molecular medicine

    2023  Volume 15, Issue 5, Page(s) e16877

    Abstract: Birt-Hogg-Dubé (BHD) syndrome is an inherited familial cancer syndrome characterized by the development of cutaneous lesions, pulmonary cysts, renal tumors and cysts and caused by loss-of-function pathogenic variants in the gene encoding the tumor- ... ...

    Abstract Birt-Hogg-Dubé (BHD) syndrome is an inherited familial cancer syndrome characterized by the development of cutaneous lesions, pulmonary cysts, renal tumors and cysts and caused by loss-of-function pathogenic variants in the gene encoding the tumor-suppressor protein folliculin (FLCN). FLCN acts as a negative regulator of TFEB and TFE3 transcription factors, master controllers of lysosomal biogenesis and autophagy, by enabling their phosphorylation by the mechanistic Target Of Rapamycin Complex 1 (mTORC1). We have previously shown that deletion of Tfeb rescued the renal cystic phenotype of kidney-specific Flcn KO mice. Using Flcn/Tfeb/Tfe3 double and triple KO mice, we now show that both Tfeb and Tfe3 contribute, in a differential and cooperative manner, to kidney cystogenesis. Remarkably, the analysis of BHD patient-derived tumor samples revealed increased activation of TFEB/TFE3-mediated transcriptional program and silencing either of the two genes rescued tumorigenesis in human BHD renal tumor cell line-derived xenografts (CDXs). Our findings demonstrate in disease-relevant models that both TFEB and TFE3 are key drivers of renal tumorigenesis and suggest novel therapeutic strategies based on the inhibition of these transcription factors.
    MeSH term(s) Humans ; Mice ; Animals ; Kidney/pathology ; Kidney Neoplasms/genetics ; Kidney Neoplasms/pathology ; Birt-Hogg-Dube Syndrome/genetics ; Birt-Hogg-Dube Syndrome/pathology ; Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/genetics ; Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/metabolism ; Transcription Factors ; Carcinogenesis/genetics ; Cysts
    Chemical Substances Basic Helix-Loop-Helix Leucine Zipper Transcription Factors ; Transcription Factors ; TFE3 protein, human ; TFEB protein, human
    Language English
    Publishing date 2023-03-29
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2467145-9
    ISSN 1757-4684 ; 1757-4676
    ISSN (online) 1757-4684
    ISSN 1757-4676
    DOI 10.15252/emmm.202216877
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Phosphorylation of FAM134C by CK2 controls starvation-induced ER-phagy.

    Di Lorenzo, Giorgia / Iavarone, Francescopaolo / Maddaluno, Marianna / Plata-Gómez, Ana Belén / Aureli, Simone / Quezada Meza, Camila Paz / Cinque, Laura / Palma, Alessandro / Reggio, Alessio / Cirillo, Carmine / Sacco, Francesca / Stolz, Alexandra / Napolitano, Gennaro / Marin, Oriano / Pinna, Lorenzo A / Ruzzene, Maria / Limongelli, Vittorio / Efeyan, Alejo / Grumati, Paolo /
    Settembre, Carmine

    Science advances

    2022  Volume 8, Issue 35, Page(s) eabo1215

    Abstract: Selective degradation of the endoplasmic reticulum (ER) via autophagy (ER-phagy) is initiated by ER-phagy receptors, which facilitate the incorporation of ER fragments into autophagosomes. FAM134 reticulon family proteins (FAM134A, FAM134B, and FAM134C) ... ...

    Abstract Selective degradation of the endoplasmic reticulum (ER) via autophagy (ER-phagy) is initiated by ER-phagy receptors, which facilitate the incorporation of ER fragments into autophagosomes. FAM134 reticulon family proteins (FAM134A, FAM134B, and FAM134C) are ER-phagy receptors with structural similarities and nonredundant functions. Whether they respond differentially to the stimulation of ER-phagy is unknown. Here, we describe an activation mechanism unique to FAM134C during starvation. In fed conditions, FAM134C is phosphorylated by casein kinase 2 (CK2) at critical residues flanking the LIR domain. Phosphorylation of these residues negatively affects binding affinity to the autophagy proteins LC3. During starvation, mTORC1 inhibition limits FAM134C phosphorylation by CK2, hence promoting receptor activation and ER-phagy. Using a novel tool to study ER-phagy in vivo and FAM134C knockout mice, we demonstrated the physiological relevance of FAM134C phosphorylation during starvation-induced ER-phagy in liver lipid metabolism. These data provide a mechanistic insight into ER-phagy regulation and an example of autophagy selectivity during starvation.
    Language English
    Publishing date 2022-08-31
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.abo1215
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  9. Article ; Online: mTORC1 hyperactivation arrests bone growth in lysosomal storage disorders by suppressing autophagy.

    Bartolomeo, Rosa / Cinque, Laura / De Leonibus, Chiara / Forrester, Alison / Salzano, Anna Chiara / Monfregola, Jlenia / De Gennaro, Emanuela / Nusco, Edoardo / Azario, Isabella / Lanzara, Carmela / Serafini, Marta / Levine, Beth / Ballabio, Andrea / Settembre, Carmine

    The Journal of clinical investigation

    2017  Volume 127, Issue 10, Page(s) 3717–3729

    Abstract: The mammalian target of rapamycin complex 1 (mTORC1) kinase promotes cell growth by activating biosynthetic pathways and suppressing catabolic pathways, particularly that of macroautophagy. A prerequisite for mTORC1 activation is its translocation to the ...

    Abstract The mammalian target of rapamycin complex 1 (mTORC1) kinase promotes cell growth by activating biosynthetic pathways and suppressing catabolic pathways, particularly that of macroautophagy. A prerequisite for mTORC1 activation is its translocation to the lysosomal surface. Deregulation of mTORC1 has been associated with the pathogenesis of several diseases, but its role in skeletal disorders is largely unknown. Here, we show that enhanced mTORC1 signaling arrests bone growth in lysosomal storage disorders (LSDs). We found that lysosomal dysfunction induces a constitutive lysosomal association and consequent activation of mTORC1 in chondrocytes, the cells devoted to bone elongation. mTORC1 hyperphosphorylates the protein UV radiation resistance-associated gene (UVRAG), reducing the activity of the associated Beclin 1-Vps34 complex and thereby inhibiting phosphoinositide production. Limiting phosphoinositide production leads to a blockage of the autophagy flux in LSD chondrocytes. As a consequence, LSD chondrocytes fail to properly secrete collagens, the main components of the cartilage extracellular matrix. In mouse models of LSD, normalization of mTORC1 signaling or stimulation of the Beclin 1-Vps34-UVRAG complex rescued the autophagy flux, restored collagen levels in cartilage, and ameliorated the bone phenotype. Taken together, these data unveil a role for mTORC1 and autophagy in the pathogenesis of skeletal disorders and suggest potential therapeutic approaches for the treatment of LSDs.
    MeSH term(s) Animals ; Autophagy ; Beclin-1/genetics ; Beclin-1/metabolism ; Bone Development ; Chondrocytes/metabolism ; Chondrocytes/pathology ; Lysosomal Storage Diseases/genetics ; Lysosomal Storage Diseases/metabolism ; Lysosomal Storage Diseases/pathology ; Mechanistic Target of Rapamycin Complex 1 ; Mice ; Mice, Knockout ; Multiprotein Complexes/genetics ; Multiprotein Complexes/metabolism ; Phosphatidylinositols/genetics ; Phosphatidylinositols/metabolism ; Phosphorylation/genetics ; Phosphorylation/radiation effects ; TOR Serine-Threonine Kinases/genetics ; TOR Serine-Threonine Kinases/metabolism ; Ultraviolet Rays
    Chemical Substances Beclin-1 ; Becn1 protein, mouse ; Multiprotein Complexes ; Phosphatidylinositols ; TOR Serine-Threonine Kinases (EC 2.7.1.1) ; Mechanistic Target of Rapamycin Complex 1 (EC 2.7.11.1)
    Language English
    Publishing date 2017-10-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3067-3
    ISSN 1558-8238 ; 0021-9738
    ISSN (online) 1558-8238
    ISSN 0021-9738
    DOI 10.1172/JCI94130
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: MiT/TFE factors control ER-phagy via transcriptional regulation of FAM134B.

    Cinque, Laura / De Leonibus, Chiara / Iavazzo, Maria / Krahmer, Natalie / Intartaglia, Daniela / Salierno, Francesco Giuseppe / De Cegli, Rossella / Di Malta, Chiara / Svelto, Maria / Lanzara, Carmela / Maddaluno, Marianna / Wanderlingh, Luca Giorgio / Huebner, Antje K / Cesana, Marcella / Bonn, Florian / Polishchuk, Elena / Hübner, Christian A / Conte, Ivan / Dikic, Ivan /
    Mann, Matthias / Ballabio, Andrea / Sacco, Francesca / Grumati, Paolo / Settembre, Carmine

    The EMBO journal

    2020  Volume 39, Issue 17, Page(s) e105696

    Abstract: Lysosomal degradation of the endoplasmic reticulum (ER) via autophagy (ER-phagy) is emerging as a critical regulator of cell homeostasis and function. The recent identification of ER-phagy receptors has shed light on the molecular mechanisms underlining ... ...

    Abstract Lysosomal degradation of the endoplasmic reticulum (ER) via autophagy (ER-phagy) is emerging as a critical regulator of cell homeostasis and function. The recent identification of ER-phagy receptors has shed light on the molecular mechanisms underlining this process. However, the signaling pathways regulating ER-phagy in response to cellular needs are still largely unknown. We found that the nutrient responsive transcription factors TFEB and TFE3-master regulators of lysosomal biogenesis and autophagy-control ER-phagy by inducing the expression of the ER-phagy receptor FAM134B. The TFEB/TFE3-FAM134B axis promotes ER-phagy activation upon prolonged starvation. In addition, this pathway is activated in chondrocytes by FGF signaling, a critical regulator of skeletal growth. FGF signaling induces JNK-dependent proteasomal degradation of the insulin receptor substrate 1 (IRS1), which in turn inhibits the PI3K-PKB/Akt-mTORC1 pathway and promotes TFEB/TFE3 nuclear translocation and enhances FAM134B transcription. Notably, FAM134B is required for protein secretion in chondrocytes, and cartilage growth and bone mineralization in medaka fish. This study identifies a new signaling pathway that allows ER-phagy to respond to both metabolic and developmental cues.
    MeSH term(s) Active Transport, Cell Nucleus ; Animals ; Autophagy ; Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/genetics ; Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/metabolism ; Cell Nucleus/genetics ; Cell Nucleus/metabolism ; Endoplasmic Reticulum/genetics ; Endoplasmic Reticulum/metabolism ; HeLa Cells ; Humans ; Intracellular Signaling Peptides and Proteins/genetics ; Intracellular Signaling Peptides and Proteins/metabolism ; Mechanistic Target of Rapamycin Complex 1/genetics ; Mechanistic Target of Rapamycin Complex 1/metabolism ; Membrane Proteins/genetics ; Membrane Proteins/metabolism ; Mice ; Oryzias ; Signal Transduction
    Chemical Substances Basic Helix-Loop-Helix Leucine Zipper Transcription Factors ; Fam134b protein, mouse ; Intracellular Signaling Peptides and Proteins ; Membrane Proteins ; RETREG1 protein, human ; TFE3 protein, human ; TFEB protein, human ; Tcfeb protein, mouse ; Tcfe3 protein, mouse (136896-33-8) ; Mechanistic Target of Rapamycin Complex 1 (EC 2.7.11.1)
    Language English
    Publishing date 2020-07-27
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 586044-1
    ISSN 1460-2075 ; 0261-4189
    ISSN (online) 1460-2075
    ISSN 0261-4189
    DOI 10.15252/embj.2020105696
    Database MEDical Literature Analysis and Retrieval System OnLINE

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