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Qi W, Bai J, Wang R, Zeng X, Zhang L. SATB1, senescence and senescence-related diseases. J Cell Physiol 2024. [PMID: 38801120 DOI: 10.1002/jcp.31327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 05/06/2024] [Accepted: 05/15/2024] [Indexed: 05/29/2024]
Abstract
Aging leads to an accumulation of cellular mutations and damage, increasing the risk of senescence, apoptosis, and malignant transformation. Cellular senescence, which is pivotal in aging, acts as both a guard against cellular transformation and as a check against cancer progression. It is marked by stable cell cycle arrest, widespread macromolecular changes, a pro-inflammatory profile, and altered gene expression. However, it remains to be determined whether these differing subsets of senescent cells result from unique intrinsic programs or are influenced by their environmental contexts. Multiple transcription regulators and chromatin modifiers contribute to these alterations. Special AT-rich sequence-binding protein 1 (SATB1) stands out as a crucial regulator in this process, orchestrating gene expression by structuring chromatin into loop domains and anchoring DNA elements. This review provides an overview of cellular senescence and delves into the role of SATB1 in senescence-related diseases. It highlights SATB1's potential in developing antiaging and anticancer strategies, potentially contributing to improved quality of life and addressing aging-related diseases.
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Affiliation(s)
- Wenjing Qi
- Department of Bioscience, Changchun Normal University, Changchun, Jilin, China
- Key Laboratory of Molecular Epigenetics of Ministry of Education, College of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Jinping Bai
- Department of Bioscience, Changchun Normal University, Changchun, Jilin, China
| | - Ruoxi Wang
- Center for Cell Structure and Function, College of Life Sciences, Key Laboratory of Animal Resistance Biology of Shandong Province, Shandong Normal University, Jinan, Shandong, China
| | - Xianlu Zeng
- Key Laboratory of Molecular Epigenetics of Ministry of Education, College of Life Sciences, Northeast Normal University, Changchun, Jilin, China
| | - Lihui Zhang
- Department of Bioscience, Changchun Normal University, Changchun, Jilin, China
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2
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Seager RJ, Ko H, Pabla S, Senosain MF, Kalinski P, Van Roey E, Gao S, Strickland KC, Previs RA, Nesline MK, Hastings S, Zhang S, Conroy JM, Jensen TJ, Eisenberg M, Caveney B, Severson EA, Ramkissoon S, Gandhi S. Immunologic Factors Associated with Differential Response to Neoadjuvant Chemoimmunotherapy in Triple-Negative Breast Cancer. J Pers Med 2024; 14:481. [PMID: 38793063 PMCID: PMC11122407 DOI: 10.3390/jpm14050481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 04/17/2024] [Accepted: 04/25/2024] [Indexed: 05/26/2024] Open
Abstract
Background: KEYNOTE-522 resulted in FDA approval of the immune checkpoint inhibitor pembrolizumab in combination with neoadjuvant chemotherapy for patients with early-stage, high-risk, triple-negative breast cancer (TNBC). Unfortunately, pembrolizumab is associated with several immune-related adverse events (irAEs). We aimed to identify potential tumor microenvironment (TME) biomarkers which could predict patients who may attain pathological complete response (pCR) with chemotherapy alone and be spared the use of anti-PD-1 immunotherapy. Methods: Comprehensive immune profiling, including RNA-seq gene expression assessment of 395 immune genes, was performed on matched FFPE tumor samples from 22 stage I-III TNBC patients (14 patients treated with neoadjuvant chemotherapy alone (NAC) and 8 treated with neoadjuvant chemotherapy combined with pembrolizumab (NAC+I)). Results: Differential gene expression analysis revealed that in the NAC group, IL12B and IL13 were both significantly associated with pCR. In the NAC+I group, LCK and TP63 were significantly associated with pCR. Patients in both treatment groups exhibiting pCR tended to have greater tumor inflammation than non-pCR patients. In the NAC+I group, patients with pCR tended to have greater cell proliferation and higher PD-L1 expression, while in the NAC group, patients with pCR tended to have lower cancer testis antigen expression. Additionally, the NAC+I group trended toward a lower relative dose intensity averaged across all chemotherapy drugs, suggesting that more dose reductions or treatment delays occurred in the NAC+I group than the NAC group. Conclusions: A comprehensive understanding of immunologic factors could potentially predict pCR to chemotherapy alone, enabling the avoidance of the unnecessary treatment of these patients with checkpoint inhibitors.
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Affiliation(s)
- Robert J. Seager
- Labcorp Oncology, Buffalo, NY 14263, USA; (S.P.); (M.-F.S.); (E.V.R.); (S.G.); (S.Z.); (J.M.C.)
| | - Heidi Ko
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
| | - Sarabjot Pabla
- Labcorp Oncology, Buffalo, NY 14263, USA; (S.P.); (M.-F.S.); (E.V.R.); (S.G.); (S.Z.); (J.M.C.)
| | - Maria-Fernanda Senosain
- Labcorp Oncology, Buffalo, NY 14263, USA; (S.P.); (M.-F.S.); (E.V.R.); (S.G.); (S.Z.); (J.M.C.)
| | - Pawel Kalinski
- Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA;
| | - Erik Van Roey
- Labcorp Oncology, Buffalo, NY 14263, USA; (S.P.); (M.-F.S.); (E.V.R.); (S.G.); (S.Z.); (J.M.C.)
| | - Shuang Gao
- Labcorp Oncology, Buffalo, NY 14263, USA; (S.P.); (M.-F.S.); (E.V.R.); (S.G.); (S.Z.); (J.M.C.)
| | - Kyle C. Strickland
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
- Department of Pathology, Duke University Medical Center, Duke Cancer Institute, Durham, NC 27710, USA
| | - Rebecca Ann Previs
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
- Department of Obstetrics & Gynecology, Duke University Medical Center, Duke Cancer Institute, Division of Gynecologic Oncology, Durham, NC 27710, USA
| | - Mary K. Nesline
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
| | - Stephanie Hastings
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
| | - Shengle Zhang
- Labcorp Oncology, Buffalo, NY 14263, USA; (S.P.); (M.-F.S.); (E.V.R.); (S.G.); (S.Z.); (J.M.C.)
| | - Jeffrey M. Conroy
- Labcorp Oncology, Buffalo, NY 14263, USA; (S.P.); (M.-F.S.); (E.V.R.); (S.G.); (S.Z.); (J.M.C.)
| | - Taylor J. Jensen
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
| | | | | | - Eric A. Severson
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
| | - Shakti Ramkissoon
- Labcorp Oncology, Durham, NC 27710, USA; (H.K.); (K.C.S.); (R.A.P.); (M.K.N.); (S.H.); (T.J.J.); (E.A.S.); (S.R.)
- Wake Forest Comprehensive Cancer Center and Department of Pathology, Wake Forest School of Medicine, Winston-Salem, NC 27710, USA
| | - Shipra Gandhi
- Roswell Park Comprehensive Cancer Center, Buffalo, NY 14263, USA;
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3
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Ramal M, Corral S, Kalisz M, Lapi E, Real FX. The urothelial gene regulatory network: understanding biology to improve bladder cancer management. Oncogene 2024; 43:1-21. [PMID: 37996699 DOI: 10.1038/s41388-023-02876-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 10/13/2023] [Accepted: 10/18/2023] [Indexed: 11/25/2023]
Abstract
The urothelium is a stratified epithelium composed of basal cells, one or more layers of intermediate cells, and an upper layer of differentiated umbrella cells. Most bladder cancers (BLCA) are urothelial carcinomas. Loss of urothelial lineage fidelity results in altered differentiation, highlighted by the taxonomic classification into basal and luminal tumors. There is a need to better understand the urothelial transcriptional networks. To systematically identify transcription factors (TFs) relevant for urothelial identity, we defined highly expressed TFs in normal human bladder using RNA-Seq data and inferred their genomic binding using ATAC-Seq data. To focus on epithelial TFs, we analyzed RNA-Seq data from patient-derived organoids recapitulating features of basal/luminal tumors. We classified TFs as "luminal-enriched", "basal-enriched" or "common" according to expression in organoids. We validated our classification by differential gene expression analysis in Luminal Papillary vs. Basal/Squamous tumors. Genomic analyses revealed well-known TFs associated with luminal (e.g., PPARG, GATA3, FOXA1) and basal (e.g., TP63, TFAP2) phenotypes and novel candidates to play a role in urothelial differentiation or BLCA (e.g., MECOM, TBX3). We also identified TF families (e.g., KLFs, AP1, circadian clock, sex hormone receptors) for which there is suggestive evidence of their involvement in urothelial differentiation and/or BLCA. Genomic alterations in these TFs are associated with BLCA. We uncover a TF network involved in urothelial cell identity and BLCA. We identify novel candidate TFs involved in differentiation and cancer that provide opportunities for a better understanding of the underlying biology and therapeutic intervention.
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Affiliation(s)
- Maria Ramal
- Epithelial Carcinogenesis Group, Molecular Oncology Programme, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Sonia Corral
- Epithelial Carcinogenesis Group, Molecular Oncology Programme, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Mark Kalisz
- Epithelial Carcinogenesis Group, Molecular Oncology Programme, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
- CIBERONC, Madrid, Spain
| | - Eleonora Lapi
- Epithelial Carcinogenesis Group, Molecular Oncology Programme, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
- CIBERONC, Madrid, Spain
| | - Francisco X Real
- Epithelial Carcinogenesis Group, Molecular Oncology Programme, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.
- CIBERONC, Madrid, Spain.
- Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Barcelona, Spain.
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4
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Wang XM, Ming K, Wang S, Wang J, Li PL, Tian RF, Liu SY, Cheng X, Chen Y, Shi W, Wan J, Hu M, Tian S, Zhang X, She ZG, Li H, Ding Y, Zhang XJ. Network-based analysis identifies key regulatory transcription factors involved in skin aging. Exp Gerontol 2023; 178:112202. [PMID: 37178875 DOI: 10.1016/j.exger.2023.112202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 05/07/2023] [Accepted: 05/08/2023] [Indexed: 05/15/2023]
Abstract
Skin aging is a complex process involving intricate genetic and environmental factors. In this study, we performed a comprehensive analysis of the transcriptional regulatory landscape of skin aging in canines. Weighted Gene Co-expression Network Analysis (WGCNA) was employed to identify aging-related gene modules. We subsequently validated the expression changes of these module genes in single-cell RNA sequencing (scRNA-seq) data of human aging skin. Notably, basal cell (BC), spinous cell (SC), mitotic cell (MC), and fibroblast (FB) were identified as the cell types with the most significant gene expression changes during aging. By integrating GENIE3 and RcisTarget, we constructed gene regulation networks (GRNs) for aging-related modules and identified core transcription factors (TFs) by intersecting significantly enriched TFs within the GRNs with hub TFs from WGCNA analysis, revealing key regulators of skin aging. Furthermore, we demonstrated the conserved role of CTCF and RAD21 in skin aging using an H2O2-stimulated cell aging model in HaCaT cells. Our findings provide new insights into the transcriptional regulatory landscape of skin aging and unveil potential targets for future intervention strategies against age-related skin disorders in both canines and humans.
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Affiliation(s)
- Xiao-Ming Wang
- School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China; Institute of Model Animal, Wuhan University, Wuhan 430071, China
| | - Ke Ming
- School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Shuang Wang
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Jia Wang
- Institute of Model Animal, Wuhan University, Wuhan 430071, China; Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Peng-Long Li
- School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China; Institute of Model Animal, Wuhan University, Wuhan 430071, China
| | - Rui-Feng Tian
- Institute of Model Animal, Wuhan University, Wuhan 430071, China; Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Shuai-Yang Liu
- School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China; Institute of Model Animal, Wuhan University, Wuhan 430071, China
| | - Xu Cheng
- Gannan Innovation and Translational Medicine Research Institute, Gannan Medical University, Ganzhou 341000, China; Key Laboratory of Cardiovascular Disease Prevention and Control, Ministry of Education, First Affiliated Hospital, Gannan Medical University, Ganzhou 341000, China
| | - Yun Chen
- Department of Cardiology, Huanggang Central Hospital, Huanggang 438000, China
| | - Wei Shi
- School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China; Institute of Model Animal, Wuhan University, Wuhan 430071, China
| | - Juan Wan
- Gannan Innovation and Translational Medicine Research Institute, Gannan Medical University, Ganzhou 341000, China
| | - Manli Hu
- Gannan Innovation and Translational Medicine Research Institute, Gannan Medical University, Ganzhou 341000, China; Key Laboratory of Cardiovascular Disease Prevention and Control, Ministry of Education, First Affiliated Hospital, Gannan Medical University, Ganzhou 341000, China
| | - Song Tian
- School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China; Institute of Model Animal, Wuhan University, Wuhan 430071, China
| | - Xin Zhang
- Gannan Innovation and Translational Medicine Research Institute, Gannan Medical University, Ganzhou 341000, China; Key Laboratory of Cardiovascular Disease Prevention and Control, Ministry of Education, First Affiliated Hospital, Gannan Medical University, Ganzhou 341000, China
| | - Zhi-Gang She
- Institute of Model Animal, Wuhan University, Wuhan 430071, China; Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Hongliang Li
- School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China; Institute of Model Animal, Wuhan University, Wuhan 430071, China; Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Gannan Innovation and Translational Medicine Research Institute, Gannan Medical University, Ganzhou 341000, China; Medical Science Research Center, Zhongnan Hospital of Wuhan University, Wuhan 430071, China.
| | - Yi Ding
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.
| | - Xiao-Jing Zhang
- School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China; Institute of Model Animal, Wuhan University, Wuhan 430071, China.
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5
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Zhou X, Zhang C, Fan L, Wu S, Yao S, Wang L, Zhong W, Ma L, Pan Y. A TP63 mutation identified in a Han Chinese family with ectodermal dysplasia. Arch Oral Biol 2023; 152:105731. [PMID: 37257258 DOI: 10.1016/j.archoralbio.2023.105731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 05/16/2023] [Accepted: 05/16/2023] [Indexed: 06/02/2023]
Abstract
OBJECTIVE The purpose of this study was to identify a pathogenic mutation located in TP63 in a nuclear Han Chinese family. DESIGN Whole-exome sequencing and Sanger sequencing were performed to identify candidate variants. The AlphaFold and PyMOL predicted the three-dimensional structure of the protein. Single-cell RNA-sequencing data and spatiotemporal transcriptomic atlas were used to generate the dissection of candidate gene expression at single-cell resolution. Significant genes (Pearson's coefficient ≥0.8 and P < 0.05) were identified for Gene Ontology (GO) analysis and Kyoto encyclopedia of genes and genomes (KEGG) pathways analysis. RESULTS A heterozygous missense variant at TP63 exon 8 (c.1010 G>A:p.Arg337Gln) was identified in the proband. This variant was predicted deleterious and likely to impair the local stability of the protein. In addition, single-cell RNA-sequencing indicated that TP63 was highly expressed in skin tissues. Furthermore, spatial transcriptome data of mice embryos showed TP63 was mainly enriched in the mucosal epithelium, thymus, epidermis, mesenchyme, and surface ectoderm. GO and KEGG pathway annotation analysis revealed that TP63 played a positive role in the process of ectoderm via the TGF-beta signaling pathway. CONCLUSIONS The missense variant of TP63 (c.1010 G>A:p.Arg337Gln) was associated with ectodermal dysplasia.
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Affiliation(s)
- Xi Zhou
- Department of Orthodontics, The Affiliated Stomatology Hospital of Nanjing Medical University, Nanjing, China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, China
| | - Chengcheng Zhang
- Department of Orthodontics, The Affiliated Stomatology Hospital of Nanjing Medical University, Nanjing, China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, China
| | - Liwen Fan
- Department of Orthodontics, The Affiliated Stomatology Hospital of Nanjing Medical University, Nanjing, China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, China
| | - Shanshan Wu
- Department of Orthodontics, The Affiliated Stomatology Hospital of Nanjing Medical University, Nanjing, China
| | - Siyue Yao
- The Affiliated Stomatology Hospital of Suzhou Vocational Health College, Suzhou 215000, China
| | - Lin Wang
- Department of Orthodontics, The Affiliated Stomatology Hospital of Nanjing Medical University, Nanjing, China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, China
| | - Weijie Zhong
- Department of Stomatology, Dushu Lake Hospital Affiliated to Soochow University, China; Department of Stomatology, Medical Center of Soochow University, China.
| | - Lan Ma
- Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, China.
| | - Yongchu Pan
- Department of Orthodontics, The Affiliated Stomatology Hospital of Nanjing Medical University, Nanjing, China; Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, China; Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, Nanjing Medical University, China.
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6
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Helenius K, Ojala L, Kainulainen L, Peltonen S, Hietala M, Pohjola P, Parikka V. Overlap between EEC and AEC syndrome and immunodeficiency in a preterm infant with a TP63 variant. Eur J Med Genet 2023; 66:104735. [PMID: 36863510 DOI: 10.1016/j.ejmg.2023.104735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 02/06/2023] [Accepted: 02/27/2023] [Indexed: 03/04/2023]
Abstract
Pathogenic variants in the transcription factor TP63 gene cause a variety of clinical phenotypes, such as ectrodactyly-ectodermal dysplasia-clefting (EEC) syndrome and ankyloblepharon-ectodermal dysplasia-clefting (AEC) syndrome. Historically, TP63-related phenotypes have been divided into several syndromes based on both the clinical presentation and location of the pathogenic variant on the TP63 gene. This division is complicated by significant overlap between syndromes. Here we describe a patient with clinical characteristics of different TP63-associated syndromes (cleft lip and palate, split feet, ectropion, erosions of the skin and corneas), associated with a de novo heterozygous pathogenic variant c.1681 T>C, p.(Cys561Arg) in exon 13 of the TP63 gene. Our patient also developed enlargement of the left-sided cardiac compartments and secondary mitral insufficiency, which is a novel finding, and immune deficiency, which has only rarely been reported. The clinical course was further complicated by prematurity and very low birth weight. We illustrate the overlapping features of EEC and AEC syndrome and multidisciplinary care needed to address the various clinical challenges.
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Affiliation(s)
- Kjell Helenius
- Department of Paediatrics and Adolescent Medicine, Turku University Hospital and University of Turku, Turku, Finland.
| | - Liisa Ojala
- Department of Ophthalmology, Turku University Hospital, Turku, Finland
| | - Leena Kainulainen
- Department of Paediatrics and Adolescent Medicine, Turku University Hospital and University of Turku, Turku, Finland
| | - Sirkku Peltonen
- Department of Dermatology, Turku University Hospital and University of Turku, Turku, Finland; Department of Dermatology and Venereology, University of Gothenburg and Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Marja Hietala
- Department of Genomics and Clinical Genetics, Turku University Hospital, Turku, Finland
| | - Pia Pohjola
- Department of Genomics and Clinical Genetics, Turku University Hospital, Turku, Finland
| | - Vilhelmiina Parikka
- Department of Paediatrics and Adolescent Medicine, Turku University Hospital and University of Turku, Turku, Finland
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Xu Y, Yang X, Xiong Q, Han J, Zhu Q. The dual role of p63 in cancer. Front Oncol 2023; 13:1116061. [PMID: 37182132 PMCID: PMC10174455 DOI: 10.3389/fonc.2023.1116061] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 04/13/2023] [Indexed: 05/16/2023] Open
Abstract
The p53 family is made up of three transcription factors: p53, p63, and p73. These proteins are well-known regulators of cell function and play a crucial role in controlling various processes related to cancer progression, including cell division, proliferation, genomic stability, cell cycle arrest, senescence, and apoptosis. In response to extra- or intracellular stress or oncogenic stimulation, all members of the p53 family are mutated in structure or altered in expression levels to affect the signaling network, coordinating many other pivotal cellular processes. P63 exists as two main isoforms (TAp63 and ΔNp63) that have been contrastingly discovered; the TA and ΔN isoforms exhibit distinguished properties by promoting or inhibiting cancer progression. As such, p63 isoforms comprise a fully mysterious and challenging regulatory pathway. Recent studies have revealed the intricate role of p63 in regulating the DNA damage response (DDR) and its impact on diverse cellular processes. In this review, we will highlight the significance of how p63 isoforms respond to DNA damage and cancer stem cells, as well as the dual role of TAp63 and ΔNp63 in cancer.
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Affiliation(s)
- Yongfeng Xu
- Abdominal Oncology Ward, Cancer Center, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Xiaojuan Yang
- Abdominal Oncology Ward, Cancer Center, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Qunli Xiong
- Abdominal Oncology Ward, Cancer Center, West China Hospital of Sichuan University, Chengdu, Sichuan, China
| | - Junhong Han
- State Key Laboratory of Biotherapy and Cancer Center, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, China
- *Correspondence: Qing Zhu, ; Junhong Han,
| | - Qing Zhu
- Abdominal Oncology Ward, Cancer Center, West China Hospital of Sichuan University, Chengdu, Sichuan, China
- *Correspondence: Qing Zhu, ; Junhong Han,
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8
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Osterburg C, Dötsch V. Structural diversity of p63 and p73 isoforms. Cell Death Differ 2022; 29:921-937. [PMID: 35314772 PMCID: PMC9091270 DOI: 10.1038/s41418-022-00975-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 01/25/2023] Open
Abstract
Abstract
The p53 protein family is the most studied protein family of all. Sequence analysis and structure determination have revealed a high similarity of crucial domains between p53, p63 and p73. Functional studies, however, have shown a wide variety of different tasks in tumor suppression, quality control and development. Here we review the structure and organization of the individual domains of p63 and p73, the interaction of these domains in the context of full-length proteins and discuss the evolutionary origin of this protein family.
Facts
Distinct physiological roles/functions are performed by specific isoforms.
The non-divided transactivation domain of p63 has a constitutively high activity while the transactivation domains of p53/p73 are divided into two subdomains that are regulated by phosphorylation.
Mdm2 binds to all three family members but ubiquitinates only p53.
TAp63α forms an autoinhibited dimeric state while all other vertebrate p53 family isoforms are constitutively tetrameric.
The oligomerization domain of p63 and p73 contain an additional helix that is necessary for stabilizing the tetrameric states. During evolution this helix got lost independently in different phylogenetic branches, while the DNA binding domain became destabilized and the transactivation domain split into two subdomains.
Open questions
Is the autoinhibitory mechanism of mammalian TAp63α conserved in p53 proteins of invertebrates that have the same function of genomic quality control in germ cells?
What is the physiological function of the p63/p73 SAM domains?
Do the short isoforms of p63 and p73 have physiological functions?
What are the roles of the N-terminal elongated TAp63 isoforms, TA* and GTA?
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9
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Bocheva G, Slominski RM, Slominski AT. The Impact of Vitamin D on Skin Aging. Int J Mol Sci 2021; 22:ijms22169097. [PMID: 34445803 PMCID: PMC8396468 DOI: 10.3390/ijms22169097] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 08/20/2021] [Accepted: 08/21/2021] [Indexed: 12/11/2022] Open
Abstract
The active metabolites of vitamin D3 (D3) and lumisterol (L3) exert a variety of antiaging and photoprotective effects on the skin. These are achieved through immunomodulation and include anti-inflammatory actions, regulation of keratinocytes proliferation, and differentiation programs to build the epidermal barrier necessary for maintaining skin homeostasis. In addition, they induce antioxidative responses, inhibit DNA damage and induce DNA repair mechanisms to attenuate premature skin aging and cancerogenesis. The mechanism of action would involve interaction with multiple nuclear receptors including VDR, AhR, LXR, reverse agonism on RORα and -γ, and nongenomic actions through 1,25D3-MARRS receptor and interaction with the nongenomic binding site of the VDR. Therefore, active forms of vitamin D3 including its canonical (1,25(OH)2D3) and noncanonical (CYP11A1-intitated) D3 derivatives as well as L3 derivatives are promising agents for the prevention, attenuation, or treatment of premature skin aging. They could be administrated orally and/or topically. Other forms of parenteral application of vitamin D3 precursor should be considered to avoid its predominant metabolism to 25(OH)D3 that is not recognized by CYP11A1 enzyme. The efficacy of topically applied vitamin D3 and L3 derivatives needs further clinical evaluation in future trials.
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Affiliation(s)
- Georgeta Bocheva
- Department of Pharmacology and Toxicology, Medical University of Sofia, 1431 Sofia, Bulgaria
- Correspondence: (G.B.); (A.T.S.)
| | - Radomir M. Slominski
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA;
- Graduate Biomedical Sciences Program, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Andrzej T. Slominski
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA;
- Comprehensive Cancer Center, Cancer Chemoprevention Program, University of Alabama at Birmingham, Birmingham, AL 35294, USA
- Veteran Administration Medical Center, Birmingham, AL 35294, USA
- Correspondence: (G.B.); (A.T.S.)
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10
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Ectrodactyly-ectodermal dysplasia-clefting syndrome with unusual cutaneous vitiligoid and psoriasiform lesions due to a novel single point TP63 gene mutation. Postepy Dermatol Alergol 2019; 36:358-364. [PMID: 31333354 PMCID: PMC6640015 DOI: 10.5114/ada.2018.73437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 01/06/2018] [Indexed: 12/11/2022] Open
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11
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Poloni G, Calore M, Rigato I, Marras E, Minervini G, Mazzotti E, Lorenzon A, Li Mura IEA, Telatin A, Zara I, Simionati B, Perazzolo Marra M, Ponti J, Occhi G, Vitiello L, Daliento L, Thiene G, Basso C, Corrado D, Tosatto S, Bauce B, Rampazzo A, De Bortoli M. A targeted next-generation gene panel reveals a novel heterozygous nonsense variant in the TP63 gene in patients with arrhythmogenic cardiomyopathy. Heart Rhythm 2019; 16:773-780. [DOI: 10.1016/j.hrthm.2018.11.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Indexed: 12/14/2022]
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12
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Abstract
SIGNIFICANCE The p53 family of transcription factors, including p53, p63, and p73, plays key roles in both biological and pathological processes, including cancer and neural development. Recent Advances: In recent years, a growing body of evidence has indicated that the entire p53 family is involved in the regulation of the central nervous system (CNS) functions as well as in the pathogenesis of several neurological disorders. Mechanistically, the p53 proteins control neuronal cell fate, terminal differentiation, and survival, via a complex interplay among the family members. CRITICAL ISSUES In this article, we discuss the involvement of the p53 family in neurobiology and in pathological conditions affecting the CNS, including neuroinflammation. FUTURE DIRECTIONS Understanding the molecular mechanism(s) underlying the function of the p53 family could improve our general knowledge of the pathogenesis of brain disorders and potentially pave the road for new therapeutic intervention. Antioxid. Redox Signal. 29, 1-14.
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Affiliation(s)
- Massimiliano Agostini
- 1 Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata," Rome, Italy .,2 Medical Research Council, Toxicology Unit, Leicester University , Leicester, United Kingdom
| | - Gerry Melino
- 1 Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata," Rome, Italy .,2 Medical Research Council, Toxicology Unit, Leicester University , Leicester, United Kingdom
| | - Francesca Bernassola
- 1 Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata," Rome, Italy
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13
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Iannolo G, Sciuto MR, Raffa GM, Pilato M, Conaldi PG. MiR34 inhibition induces human heart progenitor proliferation. Cell Death Dis 2018; 9:368. [PMID: 29511160 PMCID: PMC5840309 DOI: 10.1038/s41419-018-0400-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 12/19/2017] [Accepted: 02/07/2018] [Indexed: 12/22/2022]
Abstract
MiR34 involvement in myocardial injury repair and ageing has been well documented in mouse model. Our aim was to establish whether the inhibition of miR34 expression through locked nucleic acid (LNA) could be used as a pharmacological intervention to enhance human heart repair. Cardiac progenitor cells were obtained by right atrial specimen collection during intraoperative procedures. Our analysis revealed a direct correlation between miR34 expression and patient age, and its silencing by LNA promoted the cardiac progenitor growth rate up to twofold ( ± 0.8). Our results confirmed the relevance of miR34a in human heart ageing, as previously demonstrated in mouse. Moreover, the decrease of miR34 expression in the cardiac progenitor cell population indicates its role in maintaining an undifferentiated status and consequently in a lower proliferation rate with the involvement of genes such as Notch-1, Numb, and p63.
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Affiliation(s)
- Gioacchin Iannolo
- Department of Laboratory Medicine and Advanced Biotechnologies, Regenerative Medicine and Biomedical Technologies Unit, IRCCS-ISMETT (Mediterranean Institute for Transplantation and advanced specialized Therapies), Palermo, Italy. .,Fondazione Ri.MED, Palermo, Italy.
| | - Maria Rita Sciuto
- Department of Hematology, Oncology, and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Giuseppe Maria Raffa
- Department for the Treatment and Study of Cardiothoracic Diseases and Cardiothoracic Transplantation, Cardiac Surgery and Heart Transplantation Unit, IRCCS-ISMETT (Mediterranean Institute for Transplantation and advanced specialized Therapies), Palermo, Italy
| | - Michele Pilato
- Department for the Treatment and Study of Cardiothoracic Diseases and Cardiothoracic Transplantation, Cardiac Surgery and Heart Transplantation Unit, IRCCS-ISMETT (Mediterranean Institute for Transplantation and advanced specialized Therapies), Palermo, Italy
| | - Pier Giulio Conaldi
- Department of Laboratory Medicine and Advanced Biotechnologies, Regenerative Medicine and Biomedical Technologies Unit, IRCCS-ISMETT (Mediterranean Institute for Transplantation and advanced specialized Therapies), Palermo, Italy
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14
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DNA replication timing alterations identify common markers between distinct progeroid diseases. Proc Natl Acad Sci U S A 2017; 114:E10972-E10980. [PMID: 29196523 DOI: 10.1073/pnas.1711613114] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Progeroid syndromes are rare genetic disorders that phenotypically resemble natural aging. Different causal mutations have been identified, but no molecular alterations have been identified that are in common to these diseases. DNA replication timing (RT) is a robust cell type-specific epigenetic feature highly conserved in the same cell types from different individuals but altered in disease. Here, we characterized DNA RT program alterations in Hutchinson-Gilford progeria syndrome (HGPS) and Rothmund-Thomson syndrome (RTS) patients compared with natural aging and cellular senescence. Our results identified a progeroid-specific RT signature that is common to cells from three HGPS and three RTS patients and distinguishes them from healthy individuals across a wide range of ages. Among the RT abnormalities, we identified the tumor protein p63 gene (TP63) as a gene marker for progeroid syndromes. By using the redifferentiation of four patient-derived induced pluripotent stem cells as a model for the onset of progeroid syndromes, we tracked the progression of RT abnormalities during development, revealing altered RT of the TP63 gene as an early event in disease progression of both HGPS and RTS. Moreover, the RT abnormalities in progeroid patients were associated with altered isoform expression of TP63 Our findings demonstrate the value of RT studies to identify biomarkers not detected by other methods, reveal abnormal TP63 RT as an early event in progeroid disease progression, and suggest TP63 gene regulation as a potential therapeutic target.
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15
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Falik-Zaccai TC, Barsheshet Y, Mandel H, Segev M, Lorber A, Gelberg S, Kalfon L, Ben Haroush S, Shalata A, Gelernter-Yaniv L, Chaim S, Raviv Shay D, Khayat M, Werbner M, Levi I, Shoval Y, Tal G, Shalev S, Reuveni E, Avitan-Hersh E, Vlodavsky E, Appl-Sarid L, Goldsher D, Bergman R, Segal Z, Bitterman-Deutsch O, Avni O. Sequence variation in PPP1R13L results in a novel form of cardio-cutaneous syndrome. EMBO Mol Med 2017; 9:319-336. [PMID: 28069640 PMCID: PMC5331242 DOI: 10.15252/emmm.201606523] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Dilated cardiomyopathy (DCM) is a life-threatening disorder whose genetic basis is heterogeneous and mostly unknown. Five Arab Christian infants, aged 4-30 months from four families, were diagnosed with DCM associated with mild skin, teeth, and hair abnormalities. All passed away before age 3. A homozygous sequence variation creating a premature stop codon at PPP1R13L encoding the iASPP protein was identified in three infants and in the mother of the other two. Patients' fibroblasts and PPP1R13L-knocked down human fibroblasts presented higher expression levels of pro-inflammatory cytokine genes in response to lipopolysaccharide, as well as Ppp1r13l-knocked down murine cardiomyocytes and hearts of Ppp1r13l-deficient mice. The hypersensitivity to lipopolysaccharide was NF-κB-dependent, and its inducible binding activity to promoters of pro-inflammatory cytokine genes was elevated in patients' fibroblasts. RNA sequencing of Ppp1r13l-knocked down murine cardiomyocytes and of hearts derived from different stages of DCM development in Ppp1r13l-deficient mice revealed the crucial role of iASPP in dampening cardiac inflammatory response. Our results determined PPP1R13L as the gene underlying a novel autosomal-recessive cardio-cutaneous syndrome in humans and strongly suggest that the fatal DCM during infancy is a consequence of failure to regulate transcriptional pathways necessary for tuning cardiac threshold response to common inflammatory stressors.
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Affiliation(s)
- Tzipora C Falik-Zaccai
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel .,Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel
| | - Yiftah Barsheshet
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel
| | - Hanna Mandel
- Metabolic Disease Unit, Rambam Health Care Campus, Haifa, Israel.,Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel
| | - Meital Segev
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel
| | - Avraham Lorber
- Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.,Department of Pediatric Cardiology, Rambam Health Care Campus, Haifa, Israel
| | - Shachaf Gelberg
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel
| | - Limor Kalfon
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Shani Ben Haroush
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Adel Shalata
- The Winter Genetic Institute, Bnei Zion Medical Center, Haifa, Israel
| | | | - Sarah Chaim
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Dorith Raviv Shay
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Morad Khayat
- The Genetic Institute, Ha'emek Medical Center, Afula, Israel
| | - Michal Werbner
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel
| | - Inbar Levi
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Yishay Shoval
- Institute of Human Genetics, Galilee Medical Center, Nahariya, Israel
| | - Galit Tal
- Metabolic Disease Unit, Rambam Health Care Campus, Haifa, Israel.,Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel
| | - Stavit Shalev
- Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.,The Genetic Institute, Ha'emek Medical Center, Afula, Israel
| | - Eli Reuveni
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel
| | | | - Eugene Vlodavsky
- Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.,Department of Pathology, Rambam Health Care Campus, Haifa, Israel
| | - Liat Appl-Sarid
- Department of Pathology, Galilee Medical Center, Nahariya, Israel
| | - Dorit Goldsher
- Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.,Department of Diagnostic Imaging, Rambam Health Care Campus, Haifa, Israel
| | - Reuven Bergman
- Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel.,Department of Dermatology, Rambam Health Care Campus, Haifa, Israel
| | - Zvi Segal
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel.,Department of Ophthalmology, Galilee Medical Center, Nahariya, Israel
| | - Ora Bitterman-Deutsch
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel.,Dermatology Clinic, Galilee Medical Center, Nahariya, Israel
| | - Orly Avni
- Faculty of Medicine in the Galilee, Bar-Ilan University, Safed, Israel
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16
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Amelio I, Antonov AA, Catani MV, Massoud R, Bernassola F, Knight RA, Melino G, Rufini A. TAp73 promotes anabolism. Oncotarget 2015; 5:12820-934. [PMID: 25514460 PMCID: PMC4350352 DOI: 10.18632/oncotarget.2667] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 10/28/2014] [Indexed: 12/18/2022] Open
Abstract
Metabolic adaptation has emerged as a hallmark of cancer and a promising therapeutic target, as rapidly proliferating cancer cells adapt their metabolism increasing nutrient uptake and reorganizing metabolic fluxes to support biosynthesis. The transcription factor p73 belongs to the p53-family and regulates tumorigenesis via its two N-terminal isoforms, with (TAp73) or without (ΔNp73) a transactivation domain. TAp73 acts as tumor suppressor, at least partially through induction of cell cycle arrest and apoptosis and through regulation of genomic stability. Here, we sought to investigate whether TAp73 also affects metabolic profiling of cancer cells. Using high throughput metabolomics, we unveil a thorough and unexpected role for TAp73 in promoting Warburg effect and cellular metabolism. TAp73-expressing cells show increased rate of glycolysis, higher amino acid uptake and increased levels and biosynthesis of acetyl-CoA. Moreover, we report an extensive TAp73-mediated upregulation of several anabolic pathways including polyamine and synthesis of membrane phospholipids. TAp73 expression also increases cellular methyl-donor S-adenosylmethionine (SAM), possibly influencing methylation and epigenetics, and promotes arginine metabolism, suggestive of a role in extracellular matrix (ECM) modeling. In summary, our data indicate that TAp73 regulates multiple metabolic pathways that impinge on numerous cellular functions, but that, overall, converge to sustain cell growth and proliferation.
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Affiliation(s)
- Ivano Amelio
- Medical Research Council, Toxicology Unit, Leicester University, Leicester LE1 9HN, UK
| | - Alexey A Antonov
- Medical Research Council, Toxicology Unit, Leicester University, Leicester LE1 9HN, UK
| | - Maria Valeria Catani
- Biochemistry Laboratory, IDI-IRCCS, University of Rome Tor Vergata, Rome 00133, Italy
| | - Renato Massoud
- Biochemistry Laboratory, IDI-IRCCS, University of Rome Tor Vergata, Rome 00133, Italy
| | - Francesca Bernassola
- Biochemistry Laboratory, IDI-IRCCS, University of Rome Tor Vergata, Rome 00133, Italy
| | - Richard A Knight
- Medical Research Council, Toxicology Unit, Leicester University, Leicester LE1 9HN, UK
| | - Gerry Melino
- Medical Research Council, Toxicology Unit, Leicester University, Leicester LE1 9HN, UK. Biochemistry Laboratory, IDI-IRCCS, University of Rome Tor Vergata, Rome 00133, Italy. Molecular Pharmacology Laboratory, Technological University, St-Petersburg, Russia
| | - Alessandro Rufini
- Medical Research Council, Toxicology Unit, Leicester University, Leicester LE1 9HN, UK. Department of Cancer Studies, Cancer Research UK, Leicester Centre, University of Leicester, Leicester, LE1 7RH, UK
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17
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Giamboi-Miraglia A, Cianfarani F, Cattani C, Lena AM, Serra V, Campione E, Terrinoni A, Zambruno G, Odorisio T, Di Daniele N, Melino G, Candi E. The E3 ligase Itch knockout mice show hyperproliferation and wound healing alteration. FEBS J 2015; 282:4435-49. [PMID: 26361888 DOI: 10.1111/febs.13514] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 08/20/2015] [Accepted: 09/09/2015] [Indexed: 12/16/2022]
Abstract
The HECT-type E3 ubiquitin ligase Itch is absent in the non-agouti-lethal 18H or Itchy mice, which develop a severe immunological disease. Several of the known Itch substrates are relevant for epidermal development and homeostasis, such as p63, Notch, c-Jun and JunB. By analysing Itchy mice before the onset of immunological alterations, we investigated the contribution of Itch in skin development and wound healing. Itchy newborn mice manifested hyperplastic epidermis, which is not present in adulthood. Itch(-/-) cultured keratinocytes showed overexpression of proliferating markers and increased capability to proliferate, migrate and to repair a scratch injury in vitro. These data correlated with improved in vivo wound healing in Itchy mice, at late time points of the repair process when Itch is physiologically upregulated. Despite healing acceleration, epidermal remodelling was delayed in the scars of Itch(-/-) mice, as indicated by enhanced epidermal thickening, keratinocyte proliferation and keratin 6 expression, and retarded keratin 14 polarization to the basal layer. Itch(-/-) keratinocyte prolonged activation was not associated with increased immune cell persistence in the scars. Our in vitro and in vivo results indicate that Itch plays a role in epidermal homeostasis and remodelling and this feature does not seem to depend on immunological alterations.
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Affiliation(s)
| | - Francesca Cianfarani
- Molecular and Cell Biology Laboratory, Istituto Dermopatico dell'Immacolata-Istituto di Ricovero e Cura a Carattere Scientifico (IDI-IRCCS), Rome, Italy
| | - Caterina Cattani
- Molecular and Cell Biology Laboratory, Istituto Dermopatico dell'Immacolata-Istituto di Ricovero e Cura a Carattere Scientifico (IDI-IRCCS), Rome, Italy
| | - Anna Maria Lena
- Department of Experimental Medicine and Surgery, University of 'Tor Vergata', Rome, Italy
| | - Valeria Serra
- Department of Experimental Medicine and Surgery, University of 'Tor Vergata', Rome, Italy
| | - Elena Campione
- Department of Dermatology, University of 'Tor Vergata', Rome, Italy
| | - Alessandro Terrinoni
- Biochemistry Laboratory, Istituto Dermopatico dell'Immacolata-Istituto di Ricovero e Cura a Carattere Scientifico (IDI-IRCCS), Rome, Italy
| | - Giovanna Zambruno
- Molecular and Cell Biology Laboratory, Istituto Dermopatico dell'Immacolata-Istituto di Ricovero e Cura a Carattere Scientifico (IDI-IRCCS), Rome, Italy
| | - Teresa Odorisio
- Biochemistry Laboratory, Istituto Dermopatico dell'Immacolata-Istituto di Ricovero e Cura a Carattere Scientifico (IDI-IRCCS), Rome, Italy
| | - Nicola Di Daniele
- Department of Systems Medicine, Hypertension and Nephrology Unit, University of 'Tor Vergata', Rome, Italy
| | - Gerry Melino
- Department of Experimental Medicine and Surgery, University of 'Tor Vergata', Rome, Italy.,MRC Toxicology Unit, Leicester, UK
| | - Eleonora Candi
- Department of Experimental Medicine and Surgery, University of 'Tor Vergata', Rome, Italy.,Biochemistry Laboratory, Istituto Dermopatico dell'Immacolata-Istituto di Ricovero e Cura a Carattere Scientifico (IDI-IRCCS), Rome, Italy
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18
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Melino S, Bellomaria A, Nepravishta R, Paci M, Melino G. p63 threonine phosphorylation signals the interaction with the WW domain of the E3 ligase Itch. Cell Cycle 2015; 13:3207-17. [PMID: 25485500 DOI: 10.4161/15384101.2014.951285] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Both in epithelial development as well as in epithelial cancers, the p53 family member p63 plays a crucial role acting as a master transcriptional regulator. P63 steady state protein levels are regulated by the E3 ubiquitin ligase Itch, via a physical interaction between the PPxY consensus sequence (PY motif) of p63 and one of the 4 WW domains of Itch; this substrate recognition process leads to protein-ubiquitylation and p63 proteasomal degradation. The interaction of the WW domains, a highly compact protein-protein binding module, with the short proline-rich sequences is therefore a crucial regulatory event that may offer innovative potential therapeutic opportunity. Previous molecular studies on the Itch-p63 recognition have been performed in vitro using the Itch-WW2 domain and the peptide interacting fragment of p63 (pep63), which includes the PY motif. Itch-WW2-pep63 interaction is also stabilized in vitro by the conformational constriction of the S-S cyclization in the p63 peptide. The PY motif of p63, as also for other proteins, is characterized by the nearby presence of a (T/S)P motif, which is a potential recognition site of the WW domain of the IV group present in the prolyl-isomerase Pin1. In this study, we demonstrate, by in silico and spectroscopical studies using both the linear pep63 and its cyclic form, that the threonine phosphorylation of the (T/S)PPPxY motif may represent a crucial regulatory event of the Itch-mediated p63 ubiquitylation, increasing the Itch-WW domains-p63 recognition event and stabilizing in vivo the Itch-WW-p63 complex. Moreover, our studies confirm that the subsequently trans/cis proline isomerization of (T/S)P motif by the Pin1 prolyl-isomerase, could modulate the E3-ligase interaction, and that the (T/S)pPtransPPxY motif represent the best conformer for the ItchWW-(T/S)PPPxY motif recognition.
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Key Words
- CXCR4, chemokine receptor
- E3 ubiquitin ligases
- HECT, Homologous E6-AP Carboxyl Terminus
- IPTG, isopropyl-β-D-thiogalactoside
- Itch
- Pin1
- Ppep63, phosphorylated pep63
- RHS, Rapp-Hodgkin syndrome
- RP-HPLC, reverse phase high performance chromatography
- TFE, 2, 2, 2-trifluoroethanol
- TNF, tumor necrosis factor
- TRAF6, TNF receptor-associated factor 6
- cPpep63, cyclic phosphorylated pep63
- p53 family
- p63
- pep63, p63(534–551) peptide
- proline isomerization
- ubiquitynation
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Affiliation(s)
- Sonia Melino
- a Dipartimento di Scienze e Tecnologie Chimiche ; University of Rome "Tor Vergata" ; Rome , Italy
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19
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Abstract
Short p63 isoform, ΔNp63, is crucial for epidermis formation, and it plays a pivotal role in controlling the turnover of basal keratinocytes by regulating the expression of a subset of genes involved in cell cycle and cell adhesion programs. The glycolytic enzyme hexokinase 2 (HK2) represents the first step of glucose utilization in cells. The family of HKs has four isoforms that differ mainly in their tissue and subcellular distribution. The preferential mitochondrial localization of HK2 at voltage-dependent anion channels provides access to ATP generated by oxidative phosphorylation and generates an ADP/ATP recycling mechanism to maintain high respiration rates and low electron leak. Here, we report that ΔNp63 depletion in human keratinocytes impairs mitochondrial basal respiration and increases mitochondrial membrane polarization and intracellular reactive oxygen species. We show ΔNp63-dependent regulation of HK2 expression, and we use ChIP, validated by p63-Chip sequencing genomewide profiling analysis, and luciferase assays to demonstrate the presence of one p63-specific responsive element within the 15th intronic region of the HK2 gene, providing evidence of a direct interaction. Our data support the notion of ΔNp63 as a master regulator in epithelial cells of a combined subset of molecular mechanisms, including cellular energy metabolism and respiration. The ΔNp63-HK2 axis is also present in epithelial cancer cells, suggesting that ΔNp63 could participate in cancer metabolic reprogramming.
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20
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Niklison-Chirou MV, Killick R, Knight RA, Nicotera P, Melino G, Agostini M. How Does p73 Cause Neuronal Defects? Mol Neurobiol 2015; 53:4509-20. [PMID: 26266644 DOI: 10.1007/s12035-015-9381-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 07/27/2015] [Indexed: 11/25/2022]
Abstract
The p53-family member, p73, plays a key role in the development of the central nervous system (CNS), in senescence, and in tumor formation. The role of p73 in neuronal differentiation is complex and involves several downstream pathways. Indeed, in the last few years, we have learnt that TAp73 directly or indirectly regulates several genes involved in neural biology. In particular, TAp73 is involved in the maintenance of neural stem/progenitor cell self-renewal and differentiation throughout the regulation of SOX-2, Hey-2, TRIM32 and Notch. In addition, TAp73 is also implicated in the regulation of the differentiation and function of postmitotic neurons by regulating the expression of p75NTR and GLS2 (glutamine metabolism). Further still, the regulation of miR-34a by TAp73 indicates that microRNAs can also participate in this multifunctional role of p73 in adult brain physiology. However, contradictory results still exist in the relationship between p73 and brain disorders, and this remains an important area for further investigation.
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Affiliation(s)
- Maria Victoria Niklison-Chirou
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK
- Blizard Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Richard Killick
- The Institute of Psychiatry, Psychology and Neuroscience, King's College London, Denmark Hill, London, SE5 8AF, UK
| | - Richard A Knight
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK
| | | | - Gerry Melino
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK.
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133, Rome, Italy.
| | - Massimiliano Agostini
- Toxicology Unit, Medical Research Council, Leicester, LE1 9HN, UK.
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133, Rome, Italy.
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21
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Landré V, Rotblat B, Melino S, Bernassola F, Melino G. Screening for E3-ubiquitin ligase inhibitors: challenges and opportunities. Oncotarget 2015; 5:7988-8013. [PMID: 25237759 PMCID: PMC4226663 DOI: 10.18632/oncotarget.2431] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The ubiquitin proteasome system (UPS) plays a role in the regulation of most cellular pathways, and its deregulation has been implicated in a wide range of human pathologies that include cancer, neurodegenerative and immunological disorders and viral infections. Targeting the UPS by small molecular regulators thus provides an opportunity for the development of therapeutics for the treatment of several diseases. The proteasome inhibitor Bortezomib was approved for treatment of hematologic malignancies by the FDA in 2003, becoming the first drug targeting the ubiquitin proteasome system in the clinic. Development of drugs targeting specific components of the ubiquitin proteasome system, however, has lagged behind, mainly due to the complexity of the ubiquitination reaction and its outcomes. However, significant advances have been made in recent years in understanding the molecular nature of the ubiquitination system and the vast variety of cellular signals that it produces. Additionally, improvement of screening methods, both in vitro and in silico, have led to the discovery of a number of compounds targeting components of the ubiquitin proteasome system, and some of these have now entered clinical trials. Here, we discuss the current state of drug discovery targeting E3 ligases and the opportunities and challenges that it provides.
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Affiliation(s)
- Vivien Landré
- Medical Research Council, Toxicology Unit, Leicester, UK
| | - Barak Rotblat
- Medical Research Council, Toxicology Unit, Leicester, UK
| | - Sonia Melino
- Biochemistry Laboratory, IDI-IRCCS, c/o Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Francesca Bernassola
- Biochemistry Laboratory, IDI-IRCCS, c/o Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Gerry Melino
- Medical Research Council, Toxicology Unit, Leicester, UK. Biochemistry Laboratory, IDI-IRCCS, c/o Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
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22
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Li D, Li C, Wu M, Chen Q, Wang Q, Ren J, Zhang Y. PKCδ stabilizes TAp63 to promote cell apoptosis. FEBS Lett 2015; 589:2094-9. [PMID: 26112605 DOI: 10.1016/j.febslet.2015.06.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 06/01/2015] [Accepted: 06/05/2015] [Indexed: 12/25/2022]
Abstract
PKCδ and p63 are respectively reported to play important roles in cell apoptosis. But there is no report on interaction between them in regulation of apoptosis. In the present study, we found that PKCδ can directly associate and up-regulate TA isoforms of p63 (TAp63) proteins via increasing their stability. PKCδ kinase activity and Thr157 site in TAp63 are crucial for this PKCδ-induced accumulation of TAp63. PKCδ can also enhance TAp63-mediated transcription and cell apoptosis. Taken together, our data indicate that PKCδ phosphorylates TAp63 proteins at Thr157 to stabilize them and promote cell apoptosis.
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Affiliation(s)
- Decai Li
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Chengdu 610065, China
| | - Chenghua Li
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Chengdu 610065, China
| | - Min Wu
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Chengdu 610065, China
| | - Qiongqiong Chen
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Chengdu 610065, China
| | - Qiao Wang
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Chengdu 610065, China
| | - Jian Ren
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Chengdu 610065, China
| | - Yujun Zhang
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, Chengdu 610065, China.
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Latina A, Viticchiè G, Lena AM, Piro MC, Annicchiarico-Petruzzelli M, Melino G, Candi E. ΔNp63 targets cytoglobin to inhibit oxidative stress-induced apoptosis in keratinocytes and lung cancer. Oncogene 2015; 35:1493-503. [PMID: 26096935 DOI: 10.1038/onc.2015.222] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 02/17/2015] [Accepted: 03/08/2015] [Indexed: 12/13/2022]
Abstract
During physiological aerobic metabolism, the epidermis undergoes significant oxidative stress as a result of the production of reactive oxygen species (ROS). To maintain a balanced oxidative state, cells have developed protective antioxidant systems, and preliminary studies suggest that the transcriptional factor p63 is involved in cellular oxidative defence. Supporting this hypothesis, the ΔNp63α isoform of p63 is expressed at high levels in the proliferative basal layer of the epidermis. Here we identify the CYGB gene as a novel transcriptional target of ΔNp63 that is involved in maintaining epidermal oxidative defence. The CYGB gene encodes cytoglobin, a member of the globin protein family, which facilitates the diffusion of oxygen through tissues and acts as a scavenger for nitric oxide or other ROS. By performing promoter activity assays and chromatin immunoprecipitation, reverse transcriptase quantitative PCR and western blotting analyses, we confirm the direct regulation of CYGB by ΔNp63α. We also demonstrate that CYGB has a protective role in proliferating keratinocytes grown under normal conditions, as well as in cells treated with exogenous hydrogen peroxide. These results indicate that ΔNp63, through its target CYGB has an important role in the cellular antioxidant system and protects keratinocytes from oxidative stress-induced apoptosis. The ΔNp63-CYGB axis is also present in lung and breast cancer cell lines, indicating that CYGB-mediated ROS-scavenging activity may also have a role in epithelial tumours. In human lung cancer data sets, the p63-CYGB interaction significantly predicts reduction of patient survival.
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Affiliation(s)
- A Latina
- Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome, Italy
| | - G Viticchiè
- Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome, Italy
| | - A M Lena
- Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome, Italy
| | - M C Piro
- Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome, Italy
| | | | - G Melino
- Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome, Italy.,Medical Research Council Toxicology Unit, Leicester, UK
| | - E Candi
- Department of Experimental Medicine and Surgery, University of Rome 'Tor Vergata', Rome, Italy.,IDI-IRCCS, Biochemistry Laboratory, Rome, Italy
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24
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Zhang B, Rotelli M, Dixon M, Calvi BR. The function of Drosophila p53 isoforms in apoptosis. Cell Death Differ 2015; 22:2058-67. [PMID: 25882045 DOI: 10.1038/cdd.2015.40] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Revised: 03/02/2015] [Accepted: 03/03/2015] [Indexed: 12/20/2022] Open
Abstract
The p53 protein is a major mediator of the cellular response to genotoxic stress and is a crucial suppressor of tumor formation. In a variety of organisms, p53 and its paralogs, p63 and p73, each encode multiple protein isoforms through alternative splicing, promoters, and translation start sites. The function of these isoforms in development and disease are still being defined. Here, we evaluate the apoptotic potential of multiple isoforms of the single p53 gene in the genetic model Drosophila melanogaster. Most previous studies have focused on the p53A isoform, but it has been recently shown that a larger p53B isoform can induce apoptosis when overexpressed. It has remained unclear, however, whether one or both isoforms are required for the apoptotic response to genotoxic stress. We show that p53B is a much more potent inducer of apoptosis than p53A when overexpressed. Overexpression of two newly identified short isoforms perturbed development and inhibited the apoptotic response to ionizing radiation. Analysis of physiological protein expression indicated that p53A is the most abundant isoform, and that both p53A and p53B can form a complex and co-localize to sub-nuclear compartments. In contrast to the overexpression results, new isoform-specific loss-of-function mutants indicated that it is the shorter p53A isoform, not full-length p53B, that is the primary mediator of pro-apoptotic gene transcription and apoptosis after ionizing radiation. Together, our data show that it is the shorter p53A isoform that mediates the apoptotic response to DNA damage, and further suggest that p53B and shorter isoforms have specialized functions.
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Affiliation(s)
- B Zhang
- Department of Biology, Indiana University, Bloomington, IN, USA
| | - M Rotelli
- Department of Biology, Indiana University, Bloomington, IN, USA
| | - M Dixon
- Department of Biology, Indiana University, Bloomington, IN, USA
| | - B R Calvi
- Department of Biology, Indiana University, Bloomington, IN, USA
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25
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Ido Y, Duranton A, Lan F, Weikel KA, Breton L, Ruderman NB. Resveratrol prevents oxidative stress-induced senescence and proliferative dysfunction by activating the AMPK-FOXO3 cascade in cultured primary human keratinocytes. PLoS One 2015; 10:e0115341. [PMID: 25647160 PMCID: PMC4315597 DOI: 10.1371/journal.pone.0115341] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Accepted: 11/21/2014] [Indexed: 01/27/2023] Open
Abstract
The aging process is perceived as resulting from a combination of intrinsic factors such as changes in intracellular signaling and extrinsic factors, most notably environmental stressors. In skin, the relationship between intrinsic changes and keratinocyte function is not clearly understood. Previously, we found that increasing the activity of AMP-activated protein kinase (AMPK) suppressed senescence in hydrogen peroxide (H2O2)-treated human primary keratinocytes, a model of oxidative stress-induced cellular aging. Using this model in the present study, we observed that resveratrol, an agent that increases the activities of both AMPK and sirtuins, ameliorated two age-associated phenotypes: cellular senescence and proliferative dysfunction. In addition, we found that treatment of keratinocytes with Ex527, a specific inhibitor of sirtuin 1 (SIRT1), attenuated the ability of resveratrol to suppress senescence. In keeping with the latter observation, we noted that compared to non-senescent keratinocytes, senescent cells lacked SIRT1. In addition to these effects on H2O2-induced senescence, resveratrol also prevented the H2O2-induced decrease in proliferation (as indicated by 3H-thymidine incorporation) in the presence of insulin. This effect was abrogated by inhibition of AMPK but not SIRT1. Compared to endothelium, we found that human keratinocytes expressed relatively high levels of Forkhead box O3 (FOXO3), a downstream target of both AMPK and SIRT1. Treatment of keratinocytes with resveratrol transactivated FOXO3 and increased the expression of its target genes including catalase. Resveratrol’s effects on both senescence and proliferation disappeared when FOXO3 was knocked down. Finally, we performed an exploratory study which showed that skin from humans over 50 years old had lower AMPK activity than skin from individuals under age 20. Collectively, these findings suggest that the effects of resveratrol on keratinocyte senescence and proliferation are regulated by the AMPK-FOXO3 pathway and in some situations, but not all, by SIRT1.
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Affiliation(s)
- Yasuo Ido
- Diabetes and Metabolism Unit, Boston University Medical Center, Boston University School of Medicine, Boston, Massachusetts, United States of America
- * E-mail:
| | | | - Fan Lan
- Endocrinology, Second Affiliated Hospital Chongqing Medical University, Chongqing, China
| | - Karen A. Weikel
- Diabetes and Metabolism Unit, Boston University Medical Center, Boston University School of Medicine, Boston, Massachusetts, United States of America
| | - Lionel Breton
- L’OREAL Research and Innovation, Aulnay sous bois, France
| | - Neil B. Ruderman
- Diabetes and Metabolism Unit, Boston University Medical Center, Boston University School of Medicine, Boston, Massachusetts, United States of America
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Nikolakis G, Makrantonaki E, Zouboulis CC. Skin mirrors human aging. Horm Mol Biol Clin Investig 2015; 16:13-28. [PMID: 25436743 DOI: 10.1515/hmbci-2013-0018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Accepted: 06/18/2013] [Indexed: 01/13/2023]
Abstract
Abstract Aged skin exhibits disturbed lipid barrier, angiogenesis, production of sweat, immune functions, and calcitriol synthesis as well as the tendency towards development of certain benign or malignant diseases. These complex biological processes comprise endogenous and exogenous factors. Ethnicity also markedly influences the phenotype of skin aging. The theories of cellular senescence, telomere shortening and decreased proliferative capacity, mitochondrial DNA single mutations, the inflammation theory, and the free radical theory try to explain the biological background of the global aging process, which is mirrored in the skin. The development of advanced glycation end-products and the declining hormonal levels are major factors influencing intrinsic aging. Chronic photodamage of the skin is the prime factor leading to extrinsic skin aging. The deterioration of important skin functions, due to intrinsic and extrinsic aging, leads to clinical manifestations, which mirror several internal age-associated diseases such as diabetes, arterial hypertension and malignancies.
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Agostini M, Niklison-Chirou MV, Catani MV, Knight RA, Melino G, Rufini A. TAp73 promotes anti-senescence-anabolism not proliferation. Aging (Albany NY) 2014; 6:921-30. [PMID: 25554796 PMCID: PMC4276786 DOI: 10.18632/aging.100701] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
Abstract
TAp73, a member of the p53 family, has been traditionally considered a tumor suppressor gene, but a recent report has claimed that it can promote cellular proliferation. This assumption is based on biochemical evidence of activation of anabolic metabolism, with enhanced pentose phosphate shunt (PPP) and nucleotide biosynthesis. Here, while we confirm that TAp73 expression enhances anabolism, we also substantiate its role in inhibiting proliferation and promoting cell death. Hence, we would like to propose an alternative interpretation of the accumulating data linking p73 to cellular metabolism: we suggest that TAp73 promotes anabolism to counteract cellular senescence rather than to support proliferation.
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Affiliation(s)
- Massimiliano Agostini
- Medical Research Council, Toxicology Unit, Leicester LE1 9HN, UK
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, 00133 Rome, Italy
| | - Maria Victoria Niklison-Chirou
- Medical Research Council, Toxicology Unit, Leicester LE1 9HN, UK
- Blizard Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK; current address
| | - Maria Valeria Catani
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, 00133 Rome, Italy
| | | | - Gerry Melino
- Medical Research Council, Toxicology Unit, Leicester LE1 9HN, UK
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, 00133 Rome, Italy
- Biochemistry Laboratory IDI-IRCC, c/o Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, 00133 Rome, Italy
| | - Alessandro Rufini
- Medical Research Council, Toxicology Unit, Leicester LE1 9HN, UK
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, 00133 Rome, Italy
- Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester UK
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28
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Regulation of p63 protein stability via ubiquitin-proteasome pathway. BIOMED RESEARCH INTERNATIONAL 2014; 2014:175721. [PMID: 24822180 PMCID: PMC4009111 DOI: 10.1155/2014/175721] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Revised: 03/10/2014] [Accepted: 03/28/2014] [Indexed: 11/20/2022]
Abstract
The p53-related p63 gene encodes multiple protein isoforms, which are involved in a variety of biological activities. p63 protein stability is mainly regulated by the ubiquitin-dependent proteasomal degradation pathway. Several ubiquitin E3 ligases have been identified and some protein kinases as well as other kinds of proteins are involved in regulation of p63 protein stability. These regulators are responsive to diverse extracellular signaling, resulting in changes of the p63 protein levels and impacting different biological processes.
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29
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Candi E, Agostini M, Melino G, Bernassola F. How the TP53 family proteins TP63 and TP73 contribute to tumorigenesis: regulators and effectors. Hum Mutat 2014; 35:702-14. [PMID: 24488880 DOI: 10.1002/humu.22523] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 01/12/2014] [Indexed: 12/23/2022]
Abstract
In mammals, the p53 family comprises two additional members, p63 and p73 (hereafter referred to as TP53, TP63, and TP73, respectively). The usage of two alternative promoters produces protein variants either with (transactivating [TA] isoforms) or without (ΔN isoforms) the N-terminal transactivation domain (TAD). In general, the TA proteins exert TP53-like tumor-suppressive activities through their ability to activate a common set of target genes. The ΔN proteins can act as dominant-negative inhibitors of the transcriptionally active family members. Additionally, they possess intrinsic-specific biological activities due to the presence of alternative TADs, and as a result of engaging a different set of regulators. This review summarizes the current understanding of upstream regulators and downstream effectors of the TP53 family proteins, with particular emphasis on those that are relevant for their role in tumorigenesis. Furthermore, we highlight the existence of networks and cross-talks among the TP53 family members, their modulators, as well as the transcriptional targets.
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Affiliation(s)
- Eleonora Candi
- Department of Experimental Medicine and Surgery, University of Rome Tor Vergata, Rome, 00133, Italy
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30
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Li C, Chang DL, Yang Z, Qi J, Liu R, He H, Li D, Xiao ZX. Pin1 modulates p63α protein stability in regulation of cell survival, proliferation and tumor formation. Cell Death Dis 2013; 4:e943. [PMID: 24309930 PMCID: PMC3877541 DOI: 10.1038/cddis.2013.468] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 10/19/2013] [Accepted: 10/24/2013] [Indexed: 12/31/2022]
Abstract
The homolog of p53 gene, p63, encodes multiple p63 protein isoforms. TAp63 proteins contain an N-terminal transactivation domain similar to that of p53 and function as tumor suppressors; whereas ΔNp63 isoforms, which lack the intact N-terminal transactivation domain, are associated with human tumorigenesis. Accumulating evidence demonstrating the important roles of p63 in development and cancer development, the regulation of p63 proteins, however, is not fully understood. In this study, we show that peptidyl-prolyl isomerase Pin1 directly binds to and stabilizes TAp63α and ΔNp63α via inhibiting the proteasomal degradation mediated by E3 ligase WWP1. We further show that Pin1 specifically interacts with T538P which is adjacent to the P550PxY543 motif, and disrupts p63α–WWP1 interaction. In addition, while Pin1 enhances TAp63α-mediated apoptosis, it promotes ΔNp63α-induced cell proliferation. Furthermore, knockdown of Pin1 in FaDu cells inhibits tumor formation in nude mice, which is rescued by simultaneous knockdown of WWP1 or ectopic expression of ΔNp63α. Moreover, overexpression of Pin1 correlates with increased expression of ΔNp63α in human oral squamous cell carcinoma samples. Together, these results suggest that Pin1-mediated modulation of ΔNp63α may have a causative role in tumorigenesis.
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Affiliation(s)
- C Li
- Center of Growth, Metabolism and Aging, Key Laboratory of Biological Resources and Ecological Environment of Ministry of Education, College of Life Sciences, and State Key Laboratory of Biotherapy, Sichuan University, Chengdu, China
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31
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Burnley P, Rahman M, Wang H, Zhang Z, Sun X, Zhuge Q, Su DM. Role of the p63-FoxN1 regulatory axis in thymic epithelial cell homeostasis during aging. Cell Death Dis 2013; 4:e932. [PMID: 24263106 PMCID: PMC3847336 DOI: 10.1038/cddis.2013.460] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 10/07/2013] [Accepted: 10/23/2013] [Indexed: 01/19/2023]
Abstract
The p63 gene regulates thymic epithelial cell (TEC) proliferation, whereas FoxN1 regulates their differentiation. However, their collaborative role in the regulation of TEC homeostasis during thymic aging is largely unknown. In murine models, the proportion of TAp63(+), but not ΔNp63(+), TECs was increased with age, which was associated with an age-related increase in senescent cell clusters, characterized by SA-β-Gal(+) and p21(+) cells. Intrathymic infusion of exogenous TAp63 cDNA into young wild-type (WT) mice led to an increase in senescent cell clusters. Blockade of TEC differentiation via conditional FoxN1 gene knockout accelerated the appearance of this phenotype to early middle age, whereas intrathymic infusion of exogenous FoxN1 cDNA into aged WT mice brought only a modest reduction in the proportion of TAp63(+) TECs, but an increase in ΔNp63(+) TECs in the partially rejuvenated thymus. Meanwhile, we found that the increased TAp63(+) population contained a high proportion of phosphorylated-p53 TECs, which may be involved in the induction of cellular senescence. Thus, TAp63 levels are positively correlated with TEC senescence but inversely correlated with expression of FoxN1 and FoxN1-regulated TEC differentiation. Thereby, the p63-FoxN1 regulatory axis in regulation of postnatal TEC homeostasis has been revealed.
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Affiliation(s)
- P Burnley
- Department of Cell Biology and Immunology, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX 76107, USA
| | - M Rahman
- Department of Cell Biology and Immunology, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX 76107, USA
| | - H Wang
- Department of Cell Biology and Immunology, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX 76107, USA
| | - Z Zhang
- Department of Cell Biology and Immunology, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX 76107, USA
| | - X Sun
- Department of Cell Biology and Immunology, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX 76107, USA
| | - Q Zhuge
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disorder Research, First Affiliated Hospital, Wenzhou Medical University, Wenzhou 35000, China
| | - D-M Su
- Department of Cell Biology and Immunology, University of North Texas Health Science Center at Fort Worth, Fort Worth, TX 76107, USA
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disorder Research, First Affiliated Hospital, Wenzhou Medical University, Wenzhou 35000, China
- Department of Cell Biology and Immunology, University of North Texas Health Science Center at Fort Worth, 3500 Camp Bowie Blvd, Fort Worth, TX 76107, USA. Tel: +1 817 735 5186; Fax: +1 817 735 2118; E-mail:
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Velletri T, Romeo F, Tucci P, Peschiaroli A, Annicchiarico-Petruzzelli M, Niklison-Chirou MV, Amelio I, Knight RA, Mak TW, Melino G, Agostini M. GLS2 is transcriptionally regulated by p73 and contributes to neuronal differentiation. Cell Cycle 2013; 12:3564-73. [PMID: 24121663 DOI: 10.4161/cc.26771] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The amino acid Glutamine is converted into Glutamate by a deamidation reaction catalyzed by the enzyme Glutaminase (GLS). Two isoforms of this enzyme have been described, and the GLS2 isoform is regulated by the tumor suppressor gene p53. Here, we show that the p53 family member TAp73 also drives the expression of GLS2. Specifically, we demonstrate that TAp73 regulates GLS2 during retinoic acid-induced terminal neuronal differentiation of neuroblastoma cells, and overexpression or inhibition of GLS2 modulates neuronal differentiation and intracellular levels of ATP. Moreover, inhibition of GLS activity, by removing Glutamine from the growth medium, impairs in vitro differentiation of cortical neurons. Finally, expression of GLS2 increases during mouse cerebellar development. Although, p73 is dispensable for the in vivo expression of GLS2, TAp73 loss affects GABA and Glutamate levels in cortical neurons. Together, these findings suggest a role for GLS2 acting, at least in part, downstream of p73 in neuronal differentiation and highlight a possible role of p73 in regulating neurotransmitter synthesis.
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Affiliation(s)
- Tania Velletri
- Medical Research Council; Toxicology Unit; Leicester University; Leicester, UK; Institute of Health Sciences; Shanghai Institutes for Biological Sciences; Chinese Academy of Sciences & Shanghai Jiao Tong University School of Medicine; Shanghai, China
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33
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Chillemi G, Davidovich P, D'Abramo M, Mametnabiev T, Garabadzhiu AV, Desideri A, Melino G. Molecular dynamics of the full-length p53 monomer. Cell Cycle 2013; 12:3098-108. [PMID: 23974096 DOI: 10.4161/cc.26162] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The p53 protein is frequently mutated in a very large proportion of human tumors, where it seems to acquire gain-of-function activity that facilitates tumor onset and progression. A possible mechanism is the ability of mutant p53 proteins to physically interact with other proteins, including members of the same family, namely p63 and p73, inactivating their function. Assuming that this interaction might occurs at the level of the monomer, to investigate the molecular basis for this interaction, here, we sample the structural flexibility of the wild-type p53 monomeric protein. The results show a strong stability up to 850 ns in the DNA binding domain, with major flexibility in the N-terminal transactivations domains (TAD1 and TAD2) as well as in the C-terminal region (tetramerization domain). Several stable hydrogen bonds have been detected between N-terminal or C-terminal and DNA binding domain, and also between N-terminal and C-terminal. Essential dynamics analysis highlights strongly correlated movements involving TAD1 and the proline-rich region in the N-terminal domain, the tetramerization region in the C-terminal domain; Lys120 in the DNA binding region. The herein presented model is a starting point for further investigation of the whole protein tetramer as well as of its mutants.
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Berman AE, Leontieva OV, Natarajan V, McCubrey JA, Demidenko ZN, Nikiforov MA. Recent progress in genetics of aging, senescence and longevity: focusing on cancer-related genes. Oncotarget 2013; 3:1522-32. [PMID: 23455653 PMCID: PMC3681491 DOI: 10.18632/oncotarget.889] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
It is widely believed that aging results from the accumulation of molecular damage, including damage of DNA and mitochondria and accumulation of molecular garbage both inside and outside of the cell. Recently, this paradigm is being replaced by the “hyperfunction theory”, which postulates that aging is caused by activation of signal transduction pathways such as TOR (Target of Rapamycin). These pathways consist of different enzymes, mostly kinases, but also phosphatases, deacetylases, GTPases, and some other molecules that cause overactivation of normal cellular functions. Overactivation of these sensory signal transduction pathways can cause cellular senescence, age-related diseases, including cancer, and shorten life span. Here we review some of the numerous very recent publications on the role of signal transduction molecules in aging and age-related diseases. As was emphasized by the author of the “hyperfunction model”, many (or actually all) of them also play roles in cancer. So these “participants” in pro-aging signaling pathways are actually very well acquainted to cancer researchers. A cancer-related journal such as Oncotarget is the perfect place for publication of such experimental studies, reviews and perspectives, as it can bridge the gap between cancer and aging researchers.
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Affiliation(s)
- Albert E Berman
- V.N. Orekhovich Institute of Biomedical Chemistry RAMS, 10 Pogodinskaya Str., Moscow, Russia.
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35
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Reichrath J. Unravelling of hidden secrets: The role of vitamin D in skin aging. DERMATO-ENDOCRINOLOGY 2013; 4:241-4. [PMID: 23467804 PMCID: PMC3583884 DOI: 10.4161/derm.21312] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The skin is the only tissue in the human body that represents both a target tissue for biologically active vitamin D compounds including 1,25-dihydroxyvitamin D [1,25(OH)2D] and has the capacity for the synthesis of 1,25(OH)2D from 7-dehydrocholesterol (7-DHC). Recent findings indicate that the vitamin D endocrine system (VDES), besides multiple other important functions, regulates aging in many tissues, including skin. This concept is strongly supported by several independent studies in genetically modified mice (including FGF23(-/-) and Klotho(-/-) mice) that are characterized by altered mineral homeostasis caused by a high vitamin D activity. These mice typically have phenotypic features of premature aging that include, besides short lifespan, retarded growth, ectopic calcification, immunological deficiency, osteoporosis, atherosclerosis, hypogonadism, skin and general organ atrophy. Notably, it has been demonstrated that these phenotypic features can be reversed by normalizing mineral homeostasis and/or vitamin D status. Interestingly, the aging phenotypes of mice suffering from hypovitaminosis D (VDR(-/-) and CYP27B1(-/-) mice) are quite similar to those suffering from hypervitaminosis D (including FGF-23(-/-) and Klotho(-/-) mice). Consequently, it has been hypothesized that thus, both hypo- and hypervitaminosis D may enhance aging. Aging seems to show a U-shaped response curve to vitamin D status, and, therefore normovitaminosis D seems to be important for preventing premature aging. Additionally, laboratory investigations have now convincingly shown that vitamin D compounds protect the skin against the hazardous effects of various skin aging-inducing agents, including ultraviolet (UV) radiation. In conclusion, these findings support the concept that UV-radiation exerts both skin aging -promoting and -inhibiting effects, the latter via induction of cutaneous vitamin D synthesis. Future studies will clarify the effect of vitamin D compounds on expression and function of potential key regulators of skin aging, such as TAp63 or the IGF-1 signaling pathway. Furthermore, the efficacy of topically applied vitamin D compounds in the prevention of skin aging has to be evaluated in future clinical trials.
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Affiliation(s)
- Jörg Reichrath
- Klinik für Dermatologie; Venerologie und Allergologie; Universitätsklinikum des Saarlandes; Homburg/Saar, Germany
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Bunnapradist S, Ciechanowski K, West-Thielke P, Mulgaonkar S, Rostaing L, Vasudev B, Budde K. Conversion from twice-daily tacrolimus to once-daily extended release tacrolimus (LCPT): the phase III randomized MELT trial. Am J Transplant 2013; 13:760-9. [PMID: 23279614 PMCID: PMC3613750 DOI: 10.1111/ajt.12035] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 10/12/2012] [Accepted: 10/13/2012] [Indexed: 01/25/2023]
Abstract
Phase III noninferiority trial examining efficacy and safety of converting stable renal transplant recipients from twice-daily tacrolimus to a novel extended-release once-daily tacrolimus formulation (LCPT) with a controlled agglomeration technology. Controls maintained tacrolimus twice daily. The primary efficacy endpoint was proportion of patients with efficacy failures (death, graft failure, locally read biopsy-proven acute rejection [BPAR], or loss to follow-up) within 12 months. Starting LCPT dose was 30% lower (15% for blacks) than preconversion tacrolimus dose; target trough levels were 4-15 ng/mL. A total of 326 patients were randomized; the mITT population (n = 162 each group) was similar demographically in the two groups. Mean daily dose of LCPT was significantly (p < 0.0001) lower than preconversion tacrolimus dose at each visit; mean trough levels between groups were similar. There were four efficacy failures in each group; safety outcomes were similar between groups. Frequency of premature study drug discontinuation was LCPT: 12% versus tacrolimus twice daily: 5% (p = 0.028). LCPT demonstrated noninferiority to tacrolimus twice daily in efficacy failure rates. LCPT may offer a safe and effective alternative for converting patients to a once-daily formulation. Compared to currently available tacrolimus formulation, LCPT requires lower doses to achieve target trough levels.
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Affiliation(s)
- S Bunnapradist
- David Geffen School of Medicine at UCLALos Angeles, CA,*Corresponding author: Suphamai Bunnapradist
| | - K Ciechanowski
- Department of Nephrology, Pomeranian Medical UniversitySzczecin, Poland
| | - P West-Thielke
- University of Illinois Hospital and Health Science SystemChicago, IL
| | | | - L Rostaing
- University Hospital Toulouse-RangueilToulouse, France
| | - B Vasudev
- Medical College of WisconsinMilwaukee, WI
| | - K Budde
- Department of Nephrology, Charité UniversitätsmedizinBerlin, Germany
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Rufini A, Tucci P, Celardo I, Melino G. Senescence and aging: the critical roles of p53. Oncogene 2013; 32:5129-43. [PMID: 23416979 DOI: 10.1038/onc.2012.640] [Citation(s) in RCA: 738] [Impact Index Per Article: 67.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 11/30/2012] [Accepted: 12/07/2012] [Indexed: 11/09/2022]
Abstract
p53 functions as a transcription factor involved in cell-cycle control, DNA repair, apoptosis and cellular stress responses. However, besides inducing cell growth arrest and apoptosis, p53 activation also modulates cellular senescence and organismal aging. Senescence is an irreversible cell-cycle arrest that has a crucial role both in aging and as a robust physiological antitumor response, which counteracts oncogenic insults. Therefore, via the regulation of senescence, p53 contributes to tumor growth suppression, in a manner strictly dependent by its expression and cellular context. In this review, we focus on the recent advances on the contribution of p53 to cellular senescence and its implication for cancer therapy, and we will discuss p53's impact on animal lifespan. Moreover, we describe p53-mediated regulation of several physiological pathways that could mediate its role in both senescence and aging.
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Affiliation(s)
- A Rufini
- Medical Research Council, Toxicology Unit, Leicester University, Leicester, UK
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Abstract
The WWOX tumor suppressor is a WW domain-containing protein. Its function in the cell has been shown to be mediated, in part, by interacting with its partners through its first WW (WW1) domain. Here, we demonstrated that WWOX via WW1 domain interacts with p53 homolog, ΔNp63α. This protein–protein interaction stabilizes ΔNp63α, through antagonizing function of the E3 ubiquitin ligase ITCH, inhibits nuclear translocation of ΔNp63α into the nucleus and suppresses ΔNp63α transactivation function. Additionally, we found that this functional crosstalk reverses cancer cells resistance to cisplatin, mediated by ΔNp63α, and consequently renders these cells more sensitive to undergo apoptosis. These findings suggest a functional crosstalk between WWOX and ΔNp63α in tumorigenesis.
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Fonseca MB, Nunes AF, Morgado AL, Solá S, Rodrigues CMP. TAp63γ demethylation regulates protein stability and cellular distribution during neural stem cell differentiation. PLoS One 2012; 7:e52417. [PMID: 23251711 PMCID: PMC3522631 DOI: 10.1371/journal.pone.0052417] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Accepted: 11/15/2012] [Indexed: 12/18/2022] Open
Abstract
p63 is a close relative of the p53 tumor suppressor and transcription factor that modulates cell fate. The full-length isoform of p63, containing a transactivation (TA) domain (TAp63) is an essential proapoptotic protein in neural development. The role of p63 in epithelial development is also well established; however, its precise function during neural differentiation remains largely controversial. Recently, it has been demonstrated that several conserved elements of apoptosis are also integral components of cellular differentiation; p53 directly interacts with key regulators of neurogenesis. The aim of this study was to evaluate the role of p63 during mouse neural stem cell (NSC) differentiation and test whether the histone H3 lysine 27-specific demethylase JMJD3 interacts with p63 to redirect NSCs to neurogenesis. Our results showed that JMJD3 and TAp63γ are coordinately regulated to establish neural-specific gene expression programs in NSCs undergoing differentiation. JMJD3 overexpression increased TAp63γ levels in a demethylase activity-dependent manner. Importantly, overexpression of TAp63γ increased β-III tubulin whereas downregulation of TAp63γ by specific p63 siRNA decreased β-III tubulin. Immunoprecipitation assays demonstrated direct interaction between TAp63γ and JMJD3, and modulation of TAp63γ methylation status by JMJD3-demethylase activity. Importantly, the demethylase activity of JMJD3 influenced TAp63γ protein stabilization and cellular distribution, as well as TAp63γ-regulated neurogenesis. These findings clarify the role of p63 in adult neural progenitor cells and reveal TAp63γ as a direct target for JMJD3-mediated neuronal commitment.
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Affiliation(s)
- Maria B. Fonseca
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Ana F. Nunes
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Ana L. Morgado
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Susana Solá
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
- Department of Biochemistry and Human Biology, Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
| | - Cecília M. P. Rodrigues
- Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
- Department of Biochemistry and Human Biology, Faculty of Pharmacy, University of Lisbon, Lisbon, Portugal
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Capturing epidermal stemness for regenerative medicine. Semin Cell Dev Biol 2012; 23:937-44. [PMID: 23036530 DOI: 10.1016/j.semcdb.2012.09.011] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Accepted: 09/25/2012] [Indexed: 12/17/2022]
Abstract
The skin is privileged because several skin-derived stem cells (epithelial stem cells from epidermis and its appendages, mesenchymal stem cells from dermis and subcutis, melanocyte stem cells) can be efficiently captured for therapeutic use. Main indications remain the permanent coverage of extensive third degree burns and healing of chronic cutaneous wounds, but recent advances in gene therapy technology open the door to the treatment of disabling inherited skin diseases with genetically corrected keratinocyte stem cells. Therapeutic skin stem cells that were initially cultured in research or hospital laboratories must be produced according strict regulatory guidelines, which ensure patients and medical teams that the medicinal cell products are safe, of constant quality and manufactured according to state-of-the art technology. Nonetheless, it does not warrant clinical efficacy and permanent engraftment of autologous stem cells remains variable. There are many challenges ahead to improve efficacy among which to keep telomere-dependent senescence and telomere-independent senescence (clonal conversion) to a minimum in cell culture and to understand the cellular and molecular mechanisms implicated in engraftment. Finally, medicinal stem cells are expansive to produce and reimbursement of costs by health insurances is a major concern in many countries.
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Lena AM, Mancini M, Rivetti di Val Cervo P, Saintigny G, Mahé C, Melino G, Candi E. MicroRNA-191 triggers keratinocytes senescence by SATB1 and CDK6 downregulation. Biochem Biophys Res Commun 2012; 423:509-14. [PMID: 22683624 PMCID: PMC3400053 DOI: 10.1016/j.bbrc.2012.05.153] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 05/26/2012] [Indexed: 01/08/2023]
Abstract
Keratinocyte replicative senescence has an important role in time-dependent changes of the epidermis, a tissue with high turnover. Senescence encompasses growth arrest during which cells remain metabolically active but acquire a typical enlarged, vacuolar and flattened morphology. It is also accompanied by the expression of endogenous senescence-associated-β-galactosidase and specific gene expression profiles. MicroRNAs levels have been shown to be modulated during keratinocytes senescence, playing key roles in inhibiting proliferation and in the acquisition of senescent markers. Here, we identify miR-191 as an anti-proliferative and replicative senescence-associated miRNA in primary human keratinocytes. Its overexpression is sufficient per se to induce senescence, as evaluated by induction of several senescence-associated markers. We show that SATB1 and CDK6 3′UTRs are two miR-191 direct targets involved in this pathway. Cdk6 and Satb1 protein levels decrease during keratinocytes replicative senescence and their silencing by siRNA is able to induce a G1 block in cell cycle, accompanied by an increase in senescence-associated markers.
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Affiliation(s)
- A M Lena
- University of Tor Vergata, Department of Experimental Medicine and Biochemical Sciences, Via Montpellier 1, Rome 00133, Italy
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