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Di Guardo G, Giacominelli-Stuffler R, Baffoni M, Pietroluongo G, Di Francesco C, Dufrusine B, Dainese E, Cocumelli C, Eleni C, Lucà R, Roperto F, Roperto S, Casalone C, Di Francesco G, Leonardi L, Centelleghe C, Mazzariol S. Localization of Viral Antigens and Brain Ultrastructural Findings in Striped Dolphins (Stenella coeruleoalba) with ‘Brain-Only’ Dolphin morbillivirus Infection. J Comp Pathol 2017. [DOI: 10.1016/j.jcpa.2016.11.182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mancini F, Pieroni L, Monteleone V, Lucà R, Fici L, Luca E, Urbani A, Xiong S, Soddu S, Masetti R, Lozano G, Pontecorvi A, Moretti F. MDM4/HIPK2/p53 cytoplasmic assembly uncovers coordinated repression of molecules with anti-apoptotic activity during early DNA damage response. Oncogene 2015; 35:228-40. [PMID: 25961923 PMCID: PMC4717155 DOI: 10.1038/onc.2015.76] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 02/02/2015] [Accepted: 02/18/2015] [Indexed: 12/14/2022]
Abstract
The p53 inhibitor, MDM4 (MDMX) is a cytoplasmic protein with p53-activating function under DNA damage conditions. Particularly, MDM4 promotes phosphorylation of p53 at Ser46, a modification that precedes different p53 activities. We investigated the mechanism by which MDM4 promotes this p53 modification and its consequences in untransformed mammary epithelial cells and tissues. In response to severe DNA damage, MDM4 stimulates p53Ser46P by binding and stabilizing serine–threonine kinase HIPK2. Under these conditions, the p53-inhibitory complex, MDM4/MDM2, dissociates and this allows MDM4 to promote p53/HIPK2 functional interaction. Comparative proteomic analysis of DNA damage-treated cells versus -untreated cells evidenced a diffuse downregulation of proteins with anti-apoptotic activity, some of which were targets of p53Ser46P/HIPK2 repressive activity. Importantly, MDM4 depletion abolishes the downregulation of these proteins indicating the requirement of MDM4 to promote p53-mediated transcriptional repression. Consistently, MDM4-mediated HIPK2/p53 activation precedes HIPK2/p53 nuclear translocation and activity. Noteworthy, repression of these proteins was evident also in mammary glands of mice subjected to γ-irradiation and was significantly enhanced in transgenic mice overexpressing MDM4. This study evidences the flexibility of MDM2/MDM4 heterodimer, which allows the development of a positive activity of cytoplasmic MDM4 towards p53-mediated transcriptional function. Noteworthy, this activity uncovers coordinated repression of molecules with shared anti-apoptotic function which precedes active cell apoptosis and that are frequently overexpressed and/or markers of tumour phenotype in human cancer.
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Affiliation(s)
- F Mancini
- Institute of Cell Biology and Neurobiology, National Research Council of Italy (CNR), Roma, Italy.,Department of Endocrinology and Metabolism, Catholic University of Roma, Roma, Italy
| | - L Pieroni
- Proteomic and Metabolomic Laboratory, Fondazione Santa Lucia, Roma, Italy.,Department of Experimental Medicine and Surgery, University of Roma 'Tor Vergata', Roma, Italy
| | - V Monteleone
- Institute of Cell Biology and Neurobiology, National Research Council of Italy (CNR), Roma, Italy
| | - R Lucà
- Institute of Cell Biology and Neurobiology, National Research Council of Italy (CNR), Roma, Italy
| | - L Fici
- Institute of Cell Biology and Neurobiology, National Research Council of Italy (CNR), Roma, Italy.,Department of Obstetrics and Gynaecology, Catholic University of Roma, Roma, Italy
| | - E Luca
- Institute of Cell Biology and Neurobiology, National Research Council of Italy (CNR), Roma, Italy.,Department of Endocrinology and Metabolism, Catholic University of Roma, Roma, Italy
| | - A Urbani
- Proteomic and Metabolomic Laboratory, Fondazione Santa Lucia, Roma, Italy.,Department of Experimental Medicine and Surgery, University of Roma 'Tor Vergata', Roma, Italy
| | - S Xiong
- Department of Genetics, M.D. Anderson Cancer Center, Houston, TX, USA
| | - S Soddu
- Regina Elena National Cancer Institute, Roma, Italy
| | - R Masetti
- Department of Obstetrics and Gynaecology, Catholic University of Roma, Roma, Italy
| | - G Lozano
- Department of Genetics, M.D. Anderson Cancer Center, Houston, TX, USA
| | - A Pontecorvi
- Department of Endocrinology and Metabolism, Catholic University of Roma, Roma, Italy
| | - F Moretti
- Institute of Cell Biology and Neurobiology, National Research Council of Italy (CNR), Roma, Italy
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Roperto S, Paciello O, Borzacchiello G, Esposito I, Riccardi M, Lucà R, Urraro C, Ceccarelli D, Russo V, Roperto F. Is BAG-3 Protein Involved in Autophagic Mechanisms in Papillomavirus-associated Urothelial Tumours in Cattle? J Comp Pathol 2013. [DOI: 10.1016/j.jcpa.2012.11.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Roperto S, Lucà R, Urraro C, Esposito I, Riccardi M, Borzacchiello G, Russo V, Corteggio A, Roperto F. Evidence of Bovine Papillomavirus Type 2 in the Placenta of Cows with Urinary Bladder Tumours. J Comp Pathol 2012. [DOI: 10.1016/j.jcpa.2011.11.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bovera F, Piccolo G, Nizza S, Lucà R, Di Meo C. Use of ostrich faeces as alternative inoculum to caecal content to study the in vitrodigestibility of alfalfa (green, dehydrated and hay). Italian Journal of Animal Science 2007. [DOI: 10.4081/ijas.2007.1s.269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- F. Bovera
- Dipartimento di Scienze Zootecniche e Ispezione degli alimenti, Università di Napoli Federico II, Italy
| | - G. Piccolo
- Dipartimento di Scienze Zootecniche e Ispezione degli alimenti, Università di Napoli Federico II, Italy
| | - S. Nizza
- Dipartimento di Scienze Zootecniche e Ispezione degli alimenti, Università di Napoli Federico II, Italy
| | - R. Lucà
- Dipartimento di Scienze Zootecniche e Ispezione degli alimenti, Università di Napoli Federico II, Italy
| | - C. Di Meo
- Dipartimento di Scienze Zootecniche e Ispezione degli alimenti, Università di Napoli Federico II, Italy
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