5 results on '"De Zio, Daniela"'
Search Results
2. Autophagy and the Cell Cycle: A Complex Landscape.
- Author
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Grønbæk Mathiassen, Søs, De Zio, Daniela, and Cecconi, Francesco
- Subjects
AUTOPHAGY ,CYTOPLASMIC granules ,LYSOSOMES ,DISEASES - Abstract
Autophagy is a self-degradation pathway, in which cytoplasmic material is sequestered in double-membrane vesicles and delivered to the lysosome for degradation. Under basal conditions, autophagy plays a homeostatic function. However, in response to various stresses, the pathway can be further induced to mediate cytoprotection. Defective autophagy has been linked to a number of human pathologies, including neoplastic transformation, even though autophagy can also sustain the growth of tumor cells in certain contexts. In recent years, a considerable correlation has emerged between autophagy induction and stress-related cell-cycle responses, as well as unexpected roles for autophagy factors and selective autophagic degradation in the process of cell division. These advances have obvious implications for our understanding of the intricate relationship between autophagy and cancer. In this review, we will discuss our current knowledge of the reciprocal regulation connecting the autophagy pathway and cell-cycle progression. Furthermore, key findings involving nonautophagic functions for autophagy-related factors in cell-cycle regulation will be addressed. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
3. Ambra1 at a glance.
- Author
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Cianfanelli, Valentina, De Zio, Daniela, Di Bartolomeo, Sabrina, Nazio, Francesca, Strappazzon, Flavie, and Cecconi, Francesco
- Subjects
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AUTOPHAGY , *CELL cycle , *ADAPTOR proteins , *MTOR protein , *ENDOPLASMIC reticulum , *PHOSPHORYLATION , *EMBRYOLOGY , *NEUROLOGICAL disorders - Abstract
The activating molecule in Beclin-1-regulated autophagy (Ambra1), also known as autophagy/Beclin-1 regulator 1, is a highly intrinsically disordered and vertebrate-conserved adapter protein that is part of the autophagy signaling network. It acts in an early step of mammalian target of rapamycin complex 1 (mTORC1)-dependent autophagy by favouring formation of the autophagosome core complex. However, recent studies have revealed that Ambra1 can also coordinate a cell response upon starvation or other stresses that involve translocation of the autophagosome core complex to the endoplasmic reticulum (ER), regulative ubiquitylation and stabilization of the kinase ULK1, selective mitochondria removal and cell cycle downregulation. Moreover, Ambra1 itself appears to be targeted by a number of regulatory processes, such as cullin-dependent degradation, caspase cleavage and several modifications, ranging from phosphorylation to ubiquitylation. Altogether, this complex network of regulation highlights the importance of Ambra1 in crucial physiological events, including metabolism, cell death and cell division. In addition, Ambra1 is an important regulator of embryonic development, and its mutation or inactivation has been shown to correlate with several pathologies of the nervous system and to be involved in carcinogenesis. In this Cell Science at a Glance article and the accompanying poster, we discuss recent advances in the Ambra1 field, particularly the role of this proautophagic protein in cellular pathophysiology. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
4. AMBRA1 regulates cyclin D to guard S-phase entry and genomic integrity
- Author
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Armando Bartolazzi, Marilena Raciti, Valentina Cianfanelli, Jiri Bartek, Rosalie C. Sears, Rikke Darling Rasmussen, Elena Papaleo, Jirina Bartkova, Guillermo Velasco, Miriam Di Marco, Robert E. Hynds, Francesco Russo, Petra Hamerlik, Salvatore Rizza, Emanuela Pupo, Cristiano De Stefanis, Franco Locatelli, Charles Swanton, Joanna Maria Merchut-Maya, Michele Pagano, Daniele Simoneschi, Søs Grønbæk Holdgaard, Letizia Lanzetti, Gergely Róna, Giacomo Milletti, Nélida Salvador, Giuseppe Filomeni, Luca Di Leo, Daniela De Zio, Francesca Nazio, Colin J. Daniel, Apolinar Maya-Mendoza, Alfie O’sullivan, Estibaliz Gabicagogeascoa, Angela Gallo, Francesco Cecconi, Silvia Campello, Matteo Bordi, Costanza Montagna, Yeon Tae Jeong, Valeriana Cesarini, David R. Pearce, Mar Lorente, Emiliano Maiani, Pasquale D’Acunzo, Marianna Carinci, Maiani, Emiliano, Milletti, Giacomo, Nazio, Francesca, Holdgaard, Søs Grønbæk, Bartkova, Jirina, Rizza, Salvatore, Cianfanelli, Valentina, Lorente, Mar, Simoneschi, Daniele, Di Marco, Miriam, D'Acunzo, Pasquale, Di Leo, Luca, Rasmussen, Rikke, Montagna, Costanza, Raciti, Marilena, De Stefanis, Cristiano, Gabicagogeascoa, Estibaliz, Rona, Gergely, Salvador, Nélida, Pupo, Emanuela, Merchut-Maya, Joanna Maria, Daniel, Colin J, Carinci, Marianna, Cesarini, Valeriana, O'Sullivan, Alfie, Jeong, Yeon-Tae, Bordi, Matteo, Russo, Francesco, Campello, Silvia, Gallo, Angela, Filomeni, Giuseppe, Lanzetti, Letizia, Sears, Rosalie C, Hamerlik, Petra, Bartolazzi, Armando, Hynds, Robert E, Pearce, David R, Swanton, Charle, Pagano, Michele, Velasco, Guillermo, Papaleo, Elena, De Zio, Daniela, Maya-Mendoza, Apolinar, Locatelli, Franco, Bartek, Jiri, and Cecconi, Francesco
- Subjects
0301 basic medicine ,Genome instability ,Cyclin D ,Cyclin-Dependent Kinase ,AMBRA1 ,medicine.disease_cause ,Ambra 1 ,S Phase ,Mice ,0302 clinical medicine ,Genes, Tumor Suppressor ,Synthetic Lethal Mutation ,Tissue homeostasis ,Cyclin ,Mice, Knockout ,Multidisciplinary ,Cell Cycle ,CELL CICLE ,Adaptor Proteins ,Gene Expression Regulation, Developmental ,Cell cycle ,Cyclin-Dependent Kinases ,Cell biology ,Settore MED/38 - PEDIATRIA GENERALE E SPECIALISTICA ,030220 oncology & carcinogenesis ,Human ,DNA Replication ,Settore BIO/06 ,Biology ,Article ,Genomic Instability ,NO ,Cell Line ,03 medical and health sciences ,Cyclin-dependent kinase ,medicine ,Animals ,Humans ,Settore BIO/10 ,Adaptor Proteins, Signal Transducing ,Cell Proliferation ,Cell growth ,Animal ,Signal Transducing ,Genética ,Ambra 1, S Phase, Cell Cycle, Cyclin D, Genomic Instability ,030104 developmental biology ,Checkpoint Kinase 1 ,biology.protein ,AMBRA ,Synthetic Lethal Mutations ,Carcinogenesis - Abstract
Mammalian development, adult tissue homeostasis and the avoidance of severe diseases including cancer require a properly orchestrated cell cycle, as well as error-free genome maintenance. The key cell-fate decision to replicate the genome is controlled by two major signalling pathways that act in parallel—the MYC pathway and the cyclin D–cyclin-dependent kinase (CDK)–retinoblastoma protein (RB) pathway1,2. Both MYC and the cyclin D–CDK–RB axis are commonly deregulated in cancer, and this is associated with increased genomic instability. The autophagic tumour-suppressor protein AMBRA1 has been linked to the control of cell proliferation, but the underlying molecular mechanisms remain poorly understood. Here we show that AMBRA1 is an upstream master regulator of the transition from G1 to S phase and thereby prevents replication stress. Using a combination of cell and molecular approaches and in vivo models, we reveal that AMBRA1 regulates the abundance of D-type cyclins by mediating their degradation. Furthermore, by controlling the transition from G1 to S phase, AMBRA1 helps to maintain genomic integrity during DNA replication, which counteracts developmental abnormalities and tumour growth. Finally, we identify the CHK1 kinase as a potential therapeutic target in AMBRA1-deficient tumours. These results advance our understanding of the control of replication-phase entry and genomic integrity, and identify the AMBRA1–cyclin D pathway as a crucial cell-cycle-regulatory mechanism that is deeply interconnected with genomic stability in embryonic development and tumorigenesis. AMBRA1-mediated degradation of cyclin D through CRL4–DDB1 regulates cell proliferation and prevents replication stress in neurodevelopment and cancer.
- Published
- 2021
5. AMBRA1 links autophagy to cell proliferation and tumorigenesis by promoting c-MYC dephosphorylation and degradation
- Author
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Cclaudia Fuoco, Daniela De Zio, Mikkel Rohde, María Salazar, Luisa Dalla Valle, Francesca Nazio, Valentina Cianfanelli, Mar Lorente, Matteo Bordi, Sabrina Di Bartolomeo, Mauro Piacentini, Manuela Antonioli, Fabio Quondamatteo, Francesco Cecconi, Guillermo Velasco, Gian Maria Fimia, Manuela Helmer-Citterich, Pier Federico Gherardini, Joern Dengjel, Christine Gretzmeier, Tatjana Skobo, Melania D'Orazio, Cianfanelli, Valentina, Fuoco, Claudia, Lorente, Mar, Salazar, Maria, Quondamatteo, Fabio, Gherardini, Pier Federico, De Zio, Daniela, Nazio, Francesca, Antonioli, Manuela, D'Orazio, Melania, Skobo, Tatjana, Bordi, Matteo, Rohde, Mikkel, Dalla Valle, Luisa, Helmer Citterich, Manuela, Gretzmeier, Christine, Dengjel, Joern, Fimia, Gian Maria, Piacentini, Mauro, Di Bartolomeo, Sabrina, Velasco, Guillermo, and Cecconi, Francesco
- Subjects
Male ,Scaffold protein ,Cell division ,autophagy ,proliferation ,Ambra1 ,Haploinsufficiency ,Mice ,cell metabolism ,Genes, Tumor Suppressor ,Protein Phosphatase 2 ,Phosphorylation ,RNA, Small Interfering ,phosphatases ,Zebrafish ,mammalian autophagy ,Settore BIO/11 ,TOR Serine-Threonine Kinases ,inhibits autophagy ,Cell biology ,Cell Transformation, Neoplastic ,regulates autophagy ,mTOR ,Female ,RNA Interference ,cell cycle ,Cell Division ,Settore BIO/06 ,protein phosphatase 2a ,growth ,Mice, Transgenic ,Biology ,Article ,Proto-Oncogene Proteins c-myc ,Cell Line, Tumor ,Autophagy ,Animals ,Humans ,cancer ,Protein kinase A ,PI3K/AKT/mTOR pathway ,Adaptor Proteins, Signal Transducing ,Cell growth ,RPTOR ,association ,Cell Biology ,Protein phosphatase 2 ,Mice, Inbred C57BL ,HEK293 Cells ,human malignancies ,pp2a ,HeLa Cells - Abstract
Inhibition of a main regulator of cell metabolism, the protein kinase mTOR, induces autophagy and inhibits cell proliferation. However, the molecular pathways involved in the cross-talk between these two mTOR-dependent cell processes are largely unknown. Here we show that the scaffold protein AMBRA1, a member of the autophagy signalling network and a downstream target of mTOR, regulates cell proliferation by facilitating the dephosphorylation and degradation of the proto-oncogene c-Myc. We found that AMBRA1 favours the interaction between c-Myc and its phosphatase PP2A and that, when mTOR is inhibited, it enhances PP2A activity on this specific target, thereby reducing the cell division rate. As expected, such a de-regulation of c-Myc correlates with increased tumorigenesis in AMBRA1-defective systems, thus supporting a role for AMBRA1 as a haploinsufficient tumour suppressor gene.
- Published
- 2014
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