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Chen L, Duan F, Ge F, Tian L, Li Y, Li Y, Zhu Q, Zhou Q, Lin H. Inhibitor of apoptosis stimulating protein of p53 protects against MPP +-induced neurotoxicity of dopaminergic neurons. Metab Brain Dis 2024; 39:871-884. [PMID: 38842662 DOI: 10.1007/s11011-024-01367-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 05/30/2024] [Indexed: 06/07/2024]
Abstract
Inhibitor of apoptosis stimulating protein of p53 (iASPP) is related to the pathogenesis of several neurological disorders by affecting the oxidative stress and survival of neurons. However, whether iASPP has a role in Parkinson disease (PD) remains to be determined. This work explored the potential regulatory effect of iASPP in an in vitro model of PD based on 1-methyl-4-phenylpyridinium (MPP+)-evoked neurotoxicity of dopaminergic neurons in culture. MN9D neurons were treated with MPP+ at 200 µM in the culture media for 24 h to induce neurotoxicity. Overexpression and silencing of iASPP in neurons were achieved by infecting recombinant adenovirus expressing iASPP and sh-iASPP, respectively. Protein expression was examined by immunoblotting. MPP+-evoked neurotoxicity of dopaminergic neurons was determined by cell viability, TUNEL, and flow cytometric assays. The transcriptional activity of nuclear erythroid factor 2-like 2 (Nrf2) was assessed by luciferase reporter assay. Kelch-like ECH-associated protein 1 (Keap1)-knockout neurons were generated by lentiCRISPR/Cas9-Keap1 constructs. Expression levels of iASPP declined in MPP+-stimulated neurons. Overexpression of iASPP in neurons exhibited inhibitory effects on MPP+-evoked apoptosis, α-synuclein accumulation, and oxidative stress, while iASPP-deficient neurons were more sensitive to MPP+-induced neurotoxicity. Overexpression of iASPP led to an enhancing effect on Nrf2 activation in MPP+-stimulated neurons. Mechanism research revealed that iASPP may contribute to the activation of Nrf2 by competing with Nrf2 in binding with Keap1. Notably, the regulatory effect of iASPP on Nrf2 was diminished in Keap1-knockout neurons. The chemical inhibition of Nrf2 or knockdown of Nrf2 abrogated the protective effects of iASPP on MPP+-induced neurotoxicity. To conclude, iASPP protects dopaminergic neurons against MPP+-induced neurotoxicity through modulation of the Keap1/Nrf2 axis. Therefore, iASPP may play a crucial role in mediating the loss of dopaminergic neurons in PD, and targeting the iASPP-Nrf2 axis could be a promising strategy for treating PD.
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Affiliation(s)
- Lei Chen
- Neurosurgery, Xi'an International Medical Center Hospital, Xi'an, 710075, China
| | - Fengju Duan
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China
| | - Fangfang Ge
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China
| | - Lu Tian
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China
| | - Yuanyuan Li
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China
| | - Ying Li
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China
| | - Qing Zhu
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China
| | - Qiong Zhou
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China.
| | - Hong Lin
- Neurology, Xi'an International Medical Center Hospital, No. 777 Xitai Road, Xi'an, 710075, China.
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2
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Miller P, Akama-Garren EH, Owen RP, Demetriou C, Carroll TM, Slee E, Al Moussawi K, Ellis M, Goldin R, O'Neill E, Lu X. p53 inhibitor iASPP is an unexpected suppressor of KRAS and inflammation-driven pancreatic cancer. Cell Death Differ 2023:10.1038/s41418-023-01168-3. [PMID: 37270580 DOI: 10.1038/s41418-023-01168-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 04/06/2023] [Accepted: 04/19/2023] [Indexed: 06/05/2023] Open
Abstract
Oncogenic KRAS activation, inflammation and p53 mutation are key drivers of pancreatic cancer (PC) development. Here we report iASPP, an inhibitor of p53, as a paradoxical suppressor of inflammation and oncogenic KRASG12D-driven PC tumorigenesis. iASPP suppresses PC onset driven by KRASG12D alone or KRASG12D in combination with mutant p53R172H. iASPP deletion limits acinar-to-ductal metaplasia (ADM) in vitro but accelerates inflammation and KRASG12D-induced ADM, pancreatitis and PC tumorigenesis in vivo. KRASG12D/iASPPΔ8/Δ8 tumours are well-differentiated classical PCs and their derivative cell lines form subcutaneous tumours in syngeneic and nude mice. Transcriptomically, either iASPP deletion or p53 mutation in the KRASG12D background altered the expression of an extensively overlapping gene set, comprised primarily of NF-κB and AP1-regulated inflammatory genes. All these identify iASPP as a suppressor of inflammation and a p53-independent oncosuppressor of PC tumorigenesis.
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Affiliation(s)
- Paul Miller
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.
| | - Elliot H Akama-Garren
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Richard P Owen
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | | | - Thomas M Carroll
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Elizabeth Slee
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Khatoun Al Moussawi
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Michael Ellis
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Robert Goldin
- Centre for Pathology, Department of Medicine, Imperial College London, London, W2 1NY, UK
| | - Eric O'Neill
- Centre for Pathology, Department of Medicine, Imperial College London, London, W2 1NY, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.
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3
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Akama-Garren EH, Miller P, Carroll TM, Tellier M, Sutendra G, Buti L, Zaborowska J, Goldin RD, Slee E, Szele FG, Murphy S, Lu X. Regulation of immunological tolerance by the p53-inhibitor iASPP. Cell Death Dis 2023; 14:84. [PMID: 36746936 PMCID: PMC9902554 DOI: 10.1038/s41419-023-05567-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 12/23/2022] [Accepted: 01/06/2023] [Indexed: 02/08/2023]
Abstract
Maintenance of immunological homeostasis between tolerance and autoimmunity is essential for the prevention of human diseases ranging from autoimmune disease to cancer. Accumulating evidence suggests that p53 can mitigate phagocytosis-induced adjuvanticity thereby promoting immunological tolerance following programmed cell death. Here we identify Inhibitor of Apoptosis Stimulating p53 Protein (iASPP), a negative regulator of p53 transcriptional activity, as a regulator of immunological tolerance. iASPP-deficiency promoted lung adenocarcinoma and pancreatic cancer tumorigenesis, while iASPP-deficient mice were less susceptible to autoimmune disease. Immune responses to iASPP-deficient tumors exhibited hallmarks of immunosuppression, including activated regulatory T cells and exhausted CD8+ T cells. Interestingly, iASPP-deficient tumor cells and tumor-infiltrating myeloid cells, CD4+, and γδ T cells expressed elevated levels of PD-1H, a recently identified transcriptional target of p53 that promotes tolerogenic phagocytosis. Identification of an iASPP/p53 axis of immune homeostasis provides a therapeutic opportunity for both autoimmune disease and cancer.
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Affiliation(s)
- Elliot H Akama-Garren
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.
- Harvard-MIT Health Sciences and Technology, Harvard Medical School, Boston, MA, 02115, USA.
| | - Paul Miller
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Thomas M Carroll
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Michael Tellier
- Sir William Dunn School of Pathology, University of Oxford, Oxford, OX1 3RE, UK
| | - Gopinath Sutendra
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
- Department of Medicine, University of Alberta, Edmonton, AB, T6G 2B7, Canada
| | - Ludovico Buti
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
- Charles River Laboratories, Leiden, Netherlands
| | - Justyna Zaborowska
- Sir William Dunn School of Pathology, University of Oxford, Oxford, OX1 3RE, UK
| | - Robert D Goldin
- Centre for Pathology, St. Mary's Hospital, Imperial College, London, W2 1NY, UK
| | - Elizabeth Slee
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Francis G Szele
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT, UK
| | - Shona Murphy
- Sir William Dunn School of Pathology, University of Oxford, Oxford, OX1 3RE, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.
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4
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Al Moussawi K, Chung K, Carroll TM, Osterburg C, Smirnov A, Lotz R, Miller P, Dedeić Z, Zhong S, Oti M, Kouwenhoven EN, Asher R, Goldin R, Tellier M, Murphy S, Zhou H, Dötsch V, Lu X. Mutant Ras and inflammation-driven skin tumorigenesis is suppressed via a JNK-iASPP-AP1 axis. Cell Rep 2022; 41:111503. [PMID: 36261000 PMCID: PMC9597577 DOI: 10.1016/j.celrep.2022.111503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 06/29/2022] [Accepted: 09/22/2022] [Indexed: 11/05/2022] Open
Abstract
Concurrent mutation of a RAS oncogene and the tumor suppressor p53 is common in tumorigenesis, and inflammation can promote RAS-driven tumorigenesis without the need to mutate p53. Here, we show, using a well-established mutant RAS and an inflammation-driven mouse skin tumor model, that loss of the p53 inhibitor iASPP facilitates tumorigenesis. Specifically, iASPP regulates expression of a subset of p63 and AP1 targets, including genes involved in skin differentiation and inflammation, suggesting that loss of iASPP in keratinocytes supports a tumor-promoting inflammatory microenvironment. Mechanistically, JNK-mediated phosphorylation regulates iASPP function and inhibits iASPP binding with AP1 components, such as JUND, via PXXP/SH3 domain-mediated interaction. Our results uncover a JNK-iASPP-AP1 regulatory axis that is crucial for tissue homeostasis. We show that iASPP is a tumor suppressor and an AP1 coregulator.
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Affiliation(s)
- Khatoun Al Moussawi
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Kathryn Chung
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Thomas M Carroll
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Christian Osterburg
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Artem Smirnov
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Rebecca Lotz
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Paul Miller
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Zinaida Dedeić
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Shan Zhong
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Martin Oti
- Radboud University, Department of Molecular Developmental Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Nijmegen, the Netherlands
| | - Evelyn N Kouwenhoven
- Radboud University, Department of Molecular Developmental Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Nijmegen, the Netherlands
| | - Ruth Asher
- Cellular Pathology, John Radcliffe Hospital, Oxford OX3 9DU, UK; Department of Histopathology, University Hospital Wales, Cardiff CF14 4XW, UK
| | - Robert Goldin
- Department of Pathology, Imperial College London, Faculty of Medicine at St Mary's, Norfolk Place, London W2 1PG, UK
| | - Michael Tellier
- Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK
| | - Shona Murphy
- Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK
| | - Huiqing Zhou
- Radboud University, Department of Molecular Developmental Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences, Nijmegen, the Netherlands; Radboud University Medical Centre, Department of Human Genetics, Radboud Institute for Molecular Life Sciences, 6500 Nijmegen, the Netherlands
| | - Volker Dötsch
- Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK.
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5
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Distinct interactors define the p63 transcriptional signature in epithelial development or cancer. Biochem J 2022; 479:1375-1392. [PMID: 35748701 PMCID: PMC9250260 DOI: 10.1042/bcj20210737] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 11/24/2022]
Abstract
The TP63 is an indispensable transcription factor for development and homeostasis of epithelia and its derived glandular tissue. It is also involved in female germline cell quality control, muscle and thymus development. It is expressed as multiple isoforms transcribed by two independent promoters, in addition to alternative splicing occurring at the mRNA 3′-UTR. Expression of the TP63 gene, specifically the amino-deleted p63 isoform, ΔNp63, is required to regulate numerous biological activities, including lineage specification, self-renewal capacity of epithelial stem cells, proliferation/expansion of basal keratinocytes, differentiation of stratified epithelia. In cancer, ΔNp63 is implicated in squamous cancers pathogenesis of different origin including skin, head and neck and lung and in sustaining self-renewal of cancer stem cells. How this transcription factor can control such a diverse set of biological pathways is central to the understanding of the molecular mechanisms through which p63 acquires oncogenic activity, profoundly changing its down-stream transcriptional signature. Here, we highlight how different proteins interacting with p63 allow it to regulate the transcription of several central genes. The interacting proteins include transcription factors/regulators, epigenetic modifiers, and post-transcriptional modifiers. Moreover, as p63 depends on its interactome, we discuss the hypothesis to target the protein interactors to directly affect p63 oncogenic activities and p63-related diseases.
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6
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Royer C, Sandham E, Slee E, Schneider F, Lagerholm CB, Godwin J, Veits N, Hathrell H, Zhou F, Leonavicius K, Garratt J, Narendra T, Vincent A, Jones C, Child T, Coward K, Graham C, Fritzsche M, Lu X, Srinivas S. ASPP2 maintains the integrity of mechanically stressed pseudostratified epithelia during morphogenesis. Nat Commun 2022; 13:941. [PMID: 35177595 PMCID: PMC8854694 DOI: 10.1038/s41467-022-28590-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 01/28/2022] [Indexed: 11/09/2022] Open
Abstract
During development, pseudostratified epithelia undergo large scale morphogenetic events associated with increased mechanical stress. Using a variety of genetic and imaging approaches, we uncover that in the mouse E6.5 epiblast, where apical tension is highest, ASPP2 safeguards tissue integrity. It achieves this by preventing the most apical daughter cells from delaminating apically following division events. In this context, ASPP2 maintains the integrity and organisation of the filamentous actin cytoskeleton at apical junctions. ASPP2 is also essential during gastrulation in the primitive streak, in somites and in the head fold region, suggesting that it is required across a wide range of pseudostratified epithelia during morphogenetic events that are accompanied by intense tissue remodelling. Finally, our study also suggests that the interaction between ASPP2 and PP1 is essential to the tumour suppressor function of ASPP2, which may be particularly relevant in the context of tissues that are subject to increased mechanical stress. The early embryo maintains its structure in the face of large mechanical stresses during morphogenesis. Here they show that ASPP2 acts to preserve epithelial integrity in regions of high apical tension during early development.
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Affiliation(s)
- Christophe Royer
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK.
| | - Elizabeth Sandham
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK
| | - Elizabeth Slee
- Ludwig Institute for Cancer Research, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Falk Schneider
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.,Translational Imaging Center, University of Southern California, Los Angeles, CA, 90089, USA
| | - Christoffer B Lagerholm
- Wolfson Imaging Centre Oxford, MRC Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - Jonathan Godwin
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK.,Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK
| | - Nisha Veits
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK
| | - Holly Hathrell
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK
| | - Felix Zhou
- Ludwig Institute for Cancer Research, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Karolis Leonavicius
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK.,Institute of Biotechnology, Vilnius University, Vilnius, Lithuania
| | - Jemma Garratt
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK.,Nuffield Department of Women's and Reproductive Health, University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital, Headington, Oxford, OX3 9DU, UK
| | - Tanaya Narendra
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK.,Nuffield Department of Women's and Reproductive Health, University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital, Headington, Oxford, OX3 9DU, UK
| | - Anna Vincent
- Oxford Fertility, Institute of Reproductive Sciences, Oxford Business Park North, Oxford, OX4 2HW, UK
| | - Celine Jones
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital, Headington, Oxford, OX3 9DU, UK
| | - Tim Child
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital, Headington, Oxford, OX3 9DU, UK.,Oxford Fertility, Institute of Reproductive Sciences, Oxford Business Park North, Oxford, OX4 2HW, UK
| | - Kevin Coward
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital, Headington, Oxford, OX3 9DU, UK
| | - Chris Graham
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Level 3, Women's Centre, John Radcliffe Hospital, Headington, Oxford, OX3 9DU, UK
| | - Marco Fritzsche
- Kennedy Institute for Rheumatology, University of Oxford, Oxford, OX3 7LF, UK.,Rosalind Franklin Institute, Didcot, OX11 0QS, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Shankar Srinivas
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, OX1 3QX, UK.
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7
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Qian K, Yuan L, Wang S, Kuang Y, Jin Q, Long D, Jiang Y, Zhao H, Liu K, Yao H. Inhibitor of apoptosis-stimulating p53 protein protects against inflammatory bowel disease in mice models by inhibiting the nuclear factor kappa B signaling. Clin Exp Immunol 2021; 205:246-256. [PMID: 33942299 DOI: 10.1111/cei.13613] [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: 11/12/2020] [Revised: 03/30/2021] [Accepted: 04/14/2021] [Indexed: 11/30/2022] Open
Abstract
Drugs and therapies available for the treatment of inflammatory bowel disease (IBD) are not satisfactory. Our previous study has established the inhibitor of apoptosis-stimulating p53 protein (iASPP) as an oncogenic regulator in colorectal cancer by forming a regulatory axis or feedback loop with miR-124, p53, or p63. As iASPP could target and inhibit nuclear factor kappa B (NF-κB) activation, in this study the role and mechanism of iASPP in IBD was investigated. The aberrant up-regulation of iASPP in IBD was subsequently confirmed, based on online data sets, clinical sample examinations and 2,4,6-trinitrobenzene sulfonic acid (TNBS)- and dextran sulfate sodium (DSS)-induced colitis mice models. TNBS or DSS stimulation successfully induced colon shortness, body weight loss, mice colon oxidative stress and inflammation. In both types of colitis mice models, iASPP over-expression improved, whereas iASPP knockdown aggravated TNBS or DSS stimulation-caused colon shortness, body weight loss and mice colon oxidative stress and inflammation. Meanwhile, in both types of colitis mice models, iASPP over-expression inhibited p65 phosphorylation and decreased the levels of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, C-X-C motif chemokine ligand (CXCL)1 and CXCL2 in mice colons, whereas iASPP knockdown exerted opposite effects.
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Affiliation(s)
- Ke Qian
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China.,Department of Breast Surgery, the Second Xiangya Hospital, Central South University, Changsha, China
| | - Lianwen Yuan
- Department of Geriatric Surgery, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Shalong Wang
- Department of Geriatric Surgery, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yong Kuang
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China
| | - Qianqian Jin
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China
| | - Dongju Long
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China
| | - Yuhong Jiang
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China
| | - Hua Zhao
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China
| | - Kuijie Liu
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China
| | - Hongliang Yao
- Department of Gastroenterology, the Second Xiangya Hospital, Central South University, Changsha, China
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8
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Tam C, Rao S, Waye MMY, Ng TB, Wang CC. Autophagy signals orchestrate chemoresistance of gynecological cancers. Biochim Biophys Acta Rev Cancer 2021; 1875:188525. [PMID: 33600824 DOI: 10.1016/j.bbcan.2021.188525] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 02/10/2021] [Accepted: 02/11/2021] [Indexed: 12/14/2022]
Abstract
Gynecological cancers are characterized by a high mortality rate when chemoresistance develops. Autophagy collaborates with apoptosis and participates in homeostasis of chemoresistance. Recent findings supported that crosstalk of necrotic, apoptotic and autophagic factors, and chemotherapy-driven hypoxia, oxidative stress and ER stress play critical roles in chemoresistance in gynecological cancers. Meanwhile, current studies have shown that autophagy could be regulated by and cooperate with metabolic regulator, survival factors, stemness factors and specific post-translation modification in chemoresistant tumor cells. Meanwhile, non-coding RNA and autophagy crosstalk also contribute to the chemoresistance. Until now, analysis of individual autophagy factors towards the clinical significance and chemoresistance in gynecological cancer is still lacking. We suggest comprehensive integrated analysis of cellular homeostasis and tumor microenvironment to clarify the role of autophagy and the associated factors in cancer progression and chemoresistance. Panel screening of pan-autophagic factors will pioneer the development of risk models for predicting efficacy of chemotherapy and guidelines for systematic treatment and precision medicine.
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Affiliation(s)
- Chit Tam
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong, China.
| | - Shitao Rao
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China; School of Medical Technology and Engineering, Fujian Medical University, Fujian, China
| | - Mary Miu Yee Waye
- The Nethersole School of Nursing, The Chinese University of Hong Kong, Hong Kong, China
| | - Tzi Bun Ng
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Chi Chiu Wang
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong, China; School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China; Reproduction and Development Laboratory, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, China.
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9
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Yagudin T, Zhao Y, Gao H, Zhang Y, Yang Y, Zhang X, Ma W, Daba TM, Ishmetov V, Kang K, Yang B, Pan Z. iASPP protects the heart from ischemia injury by inhibiting p53 expression and cardiomyocyte apoptosis. Acta Biochim Biophys Sin (Shanghai) 2021; 53:102-111. [PMID: 33128543 DOI: 10.1093/abbs/gmaa104] [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: 03/09/2020] [Indexed: 11/12/2022] Open
Abstract
Currently, there remains a great need to elucidate the molecular mechanism of acute myocardial infarction in order to facilitate the development of novel therapy. Inhibitor of apoptosis-stimulating protein of p53 (iASPP) is a member of the ASPP family proteins and an evolutionarily preserved inhibitor of p53 that is involved in many cellular processes, including apoptosis of cancer cells. The purpose of this study was to investigate the possible role of iASPP in acute myocardial infarction. The protein level of iASPP was markedly reduced in the ischemic hearts in vivo and hydrogen peroxide-exposed cardiomyocytes in vitro. Overexpression of iASPP reduced the infarct size and cardiomyocyte apoptosis of mice subjected to 24 h of coronary artery ligation. Echocardiography showed that cardiac function was improved as indicated by the increase in ejection fraction and fractional shortening. In contrast, knockdown of iASPP exacerbated cardiac injury as manifested by impaired cardiac function, increased infarct size, and apoptosis rate. Mechanistically, overexpression of iASPP inhibited, while knockdown of iASPP increased the expressions of p53 and Bax, the key regulators of apoptosis. Taken together, our results suggested that iASPP is an important regulator of cardiomyocyte apoptosis, which represents a potential target in the therapy of myocardial infarction.
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Affiliation(s)
- Timur Yagudin
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
- Department of Hospital Surgery, Bashkir State Medical University, Ufa 450008, Russian Federation
| | - Yue Zhao
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Haiyu Gao
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Yang Zhang
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Ying Yang
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Xiaofang Zhang
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Wenbo Ma
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Tolessa Muleta Daba
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Vladimir Ishmetov
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
- Department of Cardiovascular Surgery in Clinic, Hospital of Bashkir State Medical University, Ufa 450059, Russian Federation
| | - Kai Kang
- Department of Cardiovascular Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - Baofeng Yang
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Zhenwei Pan
- Department of Pharmacology (The Key Laboratory of Cardiovascular Research, Ministry of Education) at College of Pharmacy, Harbin Medical University, Harbin 150086, China
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10
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Bai B, Zeng G, Chen R, Ai Y, Qiang H. Upregulation of iASPP ameliorates hypoxia/reoxygenation-induced apoptosis and oxidative stress in cardiomyocytes by upregulating Nrf2 signaling. J Biochem Mol Toxicol 2020; 35:e22686. [PMID: 33332723 DOI: 10.1002/jbt.22686] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 11/16/2020] [Accepted: 11/25/2020] [Indexed: 12/11/2022]
Abstract
The inhibitor of apoptosis-stimulating protein of p53 (iASPP) acts as a key modulator of cellular protection against oxidative stress. In the present work, we assessed the role of iASPP in the regulation of cardiomyocyte injury induced by hypoxia/reoxygenation (H/R). We found that H/R-exposed cardiomyocytes expressed decreased levels of iASPP. The upregulation of iASPP repressed H/R-induced injury by decreasing levels of apoptosis and reactive oxygen species production. The upregulation of iASPP increased nuclear factor (erythroid-derived 2)-like 2 (Nrf2) nuclear translocation and enhanced Nrf2 activation. The overexpression of Kelch-like ECH-associated protein 1 reversed iASPP-mediated promotion of Nrf2 activation. Nrf2 inhibition abrogated iASPP-mediated cardioprotective effects in H/R-exposed cardiomyocytes. Our work demonstrates that the upregulation of iASPP ameliorates H/R-induced apoptosis and oxidative stress in cardiomyocytes via potentiating Nrf2 signaling via modulation of Keap1.
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Affiliation(s)
- Baobao Bai
- Department of Cardiovascular Medicine, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.,Department of Cardiology, Second Affiliated Hospital, Military Medical University of The Air Force, Xi'an, China
| | - Guangwei Zeng
- Department of Cardiology, Second Affiliated Hospital, Military Medical University of The Air Force, Xi'an, China
| | - Ruirui Chen
- Department of Cardiology, Second Affiliated Hospital, Military Medical University of The Air Force, Xi'an, China
| | - Yongfei Ai
- Department of Cardiology, Second Affiliated Hospital, Military Medical University of The Air Force, Xi'an, China
| | - Hua Qiang
- Department of Cardiovascular Medicine, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
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11
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iASPP-Mediated ROS Inhibition Drives 5-Fu Resistance Dependent on Nrf2 Antioxidative Signaling Pathway in Gastric Adenocarcinoma. Dig Dis Sci 2020; 65:2873-2883. [PMID: 31938994 DOI: 10.1007/s10620-019-06022-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Accepted: 12/19/2019] [Indexed: 12/19/2022]
Abstract
AIMS Inhibitor for the apoptosis-stimulating protein of p53 (iASPP) has been reported to be correlated with 5-fluorouracil (5-Fu) resistance in renal cell carcinoma. Here, we uncover mechanisms of iASPP-Nrf2-ROS regulation of 5-Fu resistance which are important for the development of alternative treatment strategies for gastric adenocarcinoma treatment. METHODS We analyzed iASPP and Nrf2 through TCGA RNA-seq data, UALCAN analysis, and cBioPortal datasets. Intracellular ROS generation was determined by 2',7'-dichloro-fluorescin diacetate staining. Transwell was used to evaluate the invasion. The expression of iASPP, Nrf2, HO-1, and GSTP1 was tested using western blot. RESULTS We found that iASPP KD led to an apparent 5-Fu-induced ROS accumulation in MGC803 and SCG790 cells. Accompanied by iASPP KD, Nrf2 was markedly decreased. iASPP-induced ROS inhibition relies on Nrf2, and due to both knocked down iASPP and Nrf2, the level of ROS did not show an obvious difference with Nrf2 KD solely. Similarly, iASPP KD failed to enhance the Nrf2 KD-mediated ROS accumulation after 5-Fu treatment, suggesting that iASPP-induced antioxidative effects related to 5-Fu resistance are partially dependent on Nrf2. Also, the combination of iASPP KD and Nrf2 KD did not show any synergistic effect on apoptosis after 5-Fu treatment in MGC803 and SCG790 cells. Further studies revealed that iASPP KD or Nrf2 KD could decrease the expression of HO-1 and GSTP1. CONCLUSIONS Our data highlight that iASPP plays a crucial role in the inhibition of 5-Fu-induced apoptosis resistance by removing ROS accumulation in gastric adenocarcinoma, and that the removal of ROS induced by iASPP is Nrf2 signaling dependent.
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12
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Increases of iASPP-Keap1 interaction mediated by syringin enhance synaptic plasticity and rescue cognitive impairments via stabilizing Nrf2 in Alzheimer's models. Redox Biol 2020; 36:101672. [PMID: 32828017 PMCID: PMC7452088 DOI: 10.1016/j.redox.2020.101672] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/15/2020] [Accepted: 08/03/2020] [Indexed: 12/30/2022] Open
Abstract
Oxidative stress is an important pathogenic manifestation of Alzheimer's disease (AD) that contributes to synaptic dysfunction, which precedes Aβ accumulation and neurofibrillary tangle formation. However, the molecular machineries that govern the decline of antioxidative defence in AD remains to be elucidated, and effective candidate for AD treatment is limited. Here, we showed that the decreases in the inhibitor of apoptosis-stimulating protein of p53 (iASPP) was associated with the vulnerability to oxidative stress in the amyloid precursor protein (APP)/presenilin 1 (PS1) mouse brain. Treatment with an antioxidant, syringin, could ameliorate AD-related pathologic and behavioural impairments. Interestingly, syringin treatment resulted in an upregulation of iASPP and the increase in the interaction of iASPP with Kelchlike ECH-associating protein 1 (Keap1). Syringin reduced neuronal apoptosis independently of p53. We confirmed that syringin-induced enhancement of antioxidant defenses involved the stabilization of Nrf2 in overexpressing human Swedish mutant APP (APPswe) cells in vitro. Syringin-mediated Nrf2 nuclear translocation facilitated the activation of the Nrf2 downstream genes via iASPP/Nrf2 axis. Our results demonstrate that syringin-mediated increases of iASPP-Keap1 interaction restore cellular redox balance. Further study on the syringin-iASPP interactions may help in understanding the regulatory mechanism and designing novel potent modulators for AD treatment. Poor expression of iASPP is associated with the serious accumulation of β-amyloid. Syringin reduces Aβ production and mitigates cognitive deficits by amending redox. Syringin-caused increases of iASPP facilitate the activation of NADPH and γGCL-C. Syringin protects neuronal cells against oxidative stress via iASPP/Nrf2 axis.
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13
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Li H, Zhang W, Zhao K, Zhao D, Zheng S, Hu Y. A previously identified apoptosis inhibitor iASPP confers resistance to chemotherapeutic drugs by suppressing senescence in cancer cells. J Biol Chem 2020; 295:4049-4063. [PMID: 32005663 DOI: 10.1074/jbc.ra119.011411] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 01/09/2020] [Indexed: 01/03/2023] Open
Abstract
Cellular senescence is terminal cell cycle arrest that represents a prominent response to numerous anticancer therapies. The oncogene inhibitor of the apoptosis-stimulating protein of p53 (iASPP) plays essential roles in regulating cellular drug response by inhibiting apoptosis. However, whether or not it regulates chemotherapy-induced senescence (TIS) in cancer cells remains unclear. Here, using two commonly used cancer cell lines, HCT 116 and MCF-7, along with the xenograft mouse model, we found that iASPP inhibits senescence and also influences the senescence-associated secretory phenotype (SASP), which confers anticancer drug resistance independently of apoptosis. Mechanistically, iASPP is transcriptionally elevated by the p65 subunit of NF-κB in senescent cells and then translocates to the nucleus, where it binds p53 and NF-κBp65. This binding inhibits their transcriptional activities toward p21 and the key SASP factors interleukin (IL)-6/IL-8, respectively, and subsequently prevents senescence. Of note, we observed that iASPP knockdown sensitizes apoptosis-resistant cancers to doxorubicin treatment by promoting senescence both in vitro and in vivo We conclude that iASPP integrates the NF-κBp65- and p53-signaling pathways and thereby regulates cell fate in response to TIS, leading to chemotherapy resistance. These findings suggest that iASPP inhibition might be a strategy that could help restore senescence in cancer cells and improve outcomes of chemotherapy-based therapies.
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Affiliation(s)
- Huayi Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, China
| | - Wenxin Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, China
| | - Kunming Zhao
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, China
| | - Dong Zhao
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, China
| | - Shanliang Zheng
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, China
| | - Ying Hu
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, China .,Shenzhen Graduate School of Harbin Institute of Technology, Shenzhen 518055, China
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14
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Wu J, Liang Y, Tan Y, Tang Y, Song H, Wang Z, Li Y, Lu M. CDK9 inhibitors reactivate p53 by downregulating iASPP. Cell Signal 2019; 67:109508. [PMID: 31866490 DOI: 10.1016/j.cellsig.2019.109508] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 12/10/2019] [Accepted: 12/19/2019] [Indexed: 12/24/2022]
Abstract
Loss of p53's tumor-suppressive function, either via TP53 mutation or hyperactive p53 inhibitory proteins, is one of the most frequent events in the development of human cancer. Here, we describe a strategy of pharmacologically inhibiting iASPP, a negative regulator of p53, to restore wild-type p53's tumor-suppressive function. iASPP knockdown in the colon cancer cell line HCT116 efficiently promoted p53's transcriptional activity and induced p53-dependent cell death, suggesting a key role for iASPP in silencing p53 in this cell line. Screening of a preclinical and clinical drug library using isogenic HCT116 cell models revealed that cyclin-dependent kinase 9 (CDK9) inhibitors preferentially inhibit p53+/+, rather than p53-/-, cells. Mechanistically, CDK9 inhibitors downregulated iASPP at the transcriptional level. This downregulation was dose- and time-dependent. CDK9 inhibitors further showed synergistic effects in killing p53+/+ HCT116 cells when combined with the MDM2 inhibitor Nutlin-3. In a large TCGA pan-cancer cohort, iASPP overexpression predicted poor overall survival (OS) in wild-type p53 patients, with worse OS observed when MDM2 was simultaneously overexpressed. Our study identifies CDK9 inhibitors as p53-reactivating agents, and proposes a strategy to treat cancer by efficiently reactivating p53 via the concurrent inhibition of iASPP and MDM2.
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Affiliation(s)
- Jiale Wu
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Ying Liang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Yun Tan
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Yigang Tang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Huaxin Song
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Zhengyuan Wang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Yuntong Li
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Min Lu
- State Key Laboratory of Medical Genomics, Shanghai Institute of Haematology, Rui Jin Hospital, School of Medicine and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200025, China.
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15
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Epigenetic Regulation of iASPP-p63 Feedback Loop in Cutaneous Squamous Cell Carcinoma. J Invest Dermatol 2019; 139:1658-1671.e8. [DOI: 10.1016/j.jid.2019.01.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 01/09/2019] [Accepted: 01/09/2019] [Indexed: 01/09/2023]
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16
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Al-Modawi RN, Brinchmann JE, Karlsen TA. Multi-pathway Protective Effects of MicroRNAs on Human Chondrocytes in an In Vitro Model of Osteoarthritis. MOLECULAR THERAPY. NUCLEIC ACIDS 2019; 17:776-790. [PMID: 31446120 PMCID: PMC6716067 DOI: 10.1016/j.omtn.2019.07.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 07/12/2019] [Accepted: 07/16/2019] [Indexed: 01/15/2023]
Abstract
Osteoarthritis (OA) is the most common degenerative joint disease. One of the main pathogenic factors of OA is thought to be inflammation. Other factors associated with OA are dysregulation of microRNAs, reduced autophagic activity, oxidative stress, and altered metabolism. microRNAs are small non-coding RNAs that are powerful regulators of gene expression. miR-140-5p is considered a cartilage-specific microRNA, is necessary for in vitro chondrogenesis, has anti-inflammatory properties, and is downregulated in osteoarthritic cartilage. Its passenger strand, miR-140-3p, is the most highly expressed microRNA in healthy cartilage and increases during in vitro chondrogenesis. miR-146a is a well-known anti-inflammatory microRNA. Several studies have illustrated its role in OA and autoimmune diseases. We show that, when human chondrocytes were transfected individually with miR-140-5p, miR-140-3p, or miR-146a prior to stimulation with interleukin-1 beta and tumor factor necrosis-alpha as an inflammatory model of OA, each of these microRNAs exhibited similar protective effects. Mass spectrometry analysis provided an insight to the altered proteome. All three microRNAs downregulated important inflammatory mediators. In addition, they affected different proteins belonging to the same biological processes, suggesting an overall inhibition of inflammation and oxidative stress, enhancement of autophagy, and restoration of other homeostatic cellular mechanisms, including metabolism.
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Affiliation(s)
- Rua Nader Al-Modawi
- Norwegian Center for Stem Cell Research, Department of Immunology and Transfusion Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway.
| | - Jan E Brinchmann
- Norwegian Center for Stem Cell Research, Department of Immunology and Transfusion Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway; Department of Molecular Medicine, University of Oslo, Oslo, Norway.
| | - Tommy A Karlsen
- Norwegian Center for Stem Cell Research, Department of Immunology and Transfusion Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway
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17
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Horibata S, Gui G, Lack J, DeStefano CB, Gottesman MM, Hourigan CS. Heterogeneity in refractory acute myeloid leukemia. Proc Natl Acad Sci U S A 2019; 116:10494-10503. [PMID: 31064876 PMCID: PMC6535032 DOI: 10.1073/pnas.1902375116] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Successful clinical remission to therapy for acute myeloid leukemia (AML) is required for long-term survival to be achieved. Despite trends in improved survival due to better supportive care, up to 40% of patients will have refractory disease, which has a poorly understood biology and carries a dismal prognosis. The development of effective treatment strategies has been hindered by a general lack of knowledge about mechanisms of chemotherapy resistance. Here, through transcriptomic analysis of 154 cases of treatment-naive AML, three chemorefractory patient groups with distinct expression profiles are identified. A classifier, four key refractory gene signatures (RG4), trained based on the expression profile of the highest risk refractory patients, validated in an independent cohort (n = 131), was prognostic for overall survival (OS) and refined an established 17-gene stemness score. Refractory subpopulations have differential expression in pathways involved in cell cycle, transcription, translation, metabolism, and/or stem cell properties. Ex vivo drug sensitivity to 122 small-molecule inhibitors revealed effective group-specific targeting of pathways among these three refractory groups. Gene expression profiling by RNA sequencing had a suboptimal ability to correctly predict those individuals resistant to conventional cytotoxic induction therapy, but could risk-stratify for OS and identify subjects most likely to have superior responses to a specific alternative therapy. Such personalized therapy may be studied prospectively in clinical trials.
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Affiliation(s)
- Sachi Horibata
- Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892;
| | - Gege Gui
- Laboratory of Myeloid Malignancies, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20814
| | - Justin Lack
- NIAID Collaborative Bioinformatics Resource, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
- Advanced Biomedical Computational Science, Frederick National Laboratory for Cancer Research sponsored by the National Cancer Institute, Frederick, MD 21702
| | - Christin B DeStefano
- Laboratory of Myeloid Malignancies, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20814
- Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814
| | - Michael M Gottesman
- Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892;
| | - Christopher S Hourigan
- Laboratory of Myeloid Malignancies, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20814;
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18
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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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19
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Iosub-Amir A, Bai F, Sohn YS, Song L, Tamir S, Marjault HB, Mayer G, Karmi O, Jennings PA, Mittler R, Onuchic JN, Friedler A, Nechushtai R. The anti-apoptotic proteins NAF-1 and iASPP interact to drive apoptosis in cancer cells. Chem Sci 2018; 10:665-673. [PMID: 30774867 PMCID: PMC6349067 DOI: 10.1039/c8sc03390k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 11/19/2018] [Indexed: 01/01/2023] Open
Abstract
We reveal a novel interaction between the two anti-apoptotic proteins iASPP and NAF-1, which are overexpressed in many types of cancer cells, and propose that this interaction is required for apoptosis activation in cancer cells. A peptide derived from the interaction interface inhibits apoptosis in cells.
Suppression of apoptosis is a key Hallmark of cancer cells, and reactivation of apoptosis is a major avenue for cancer therapy. We reveal an interaction between the two anti-apoptotic proteins iASPP and NAF-1, which are overexpressed in many types of cancer cells and tumors. iASPP is an inhibitory member of the ASPP protein family, whereas NAF-1 belongs to the NEET 2Fe–2S protein family. We show that the two proteins are stimulated to interact in cells during apoptosis. Using peptide array screening and computational methods we mapped the interaction interfaces of both proteins to residues 764–778 of iASPP that bind to a surface groove of NAF-1. A peptide corresponding to the iASPP 764–780 sequence stabilized the NAF-1 cluster, inhibited NAF-1 interaction with iASPP, and inhibited staurosporine-induced apoptosis activation in human breast cancer, as well as in PC-3 prostate cancer cells in which p53 is inactive. The iASPP 764–780 IC50 value for inhibition of cell death in breast cancer cells was 13 ± 1 μM. The level of cell death inhibition by iASPP 764–780 was altered in breast cancer cells expressing different levels and/or variants of NAF-1, indicating that the peptide activity is associated with NAF-1 function. We propose that the interaction between iASPP and NAF-1 is required for apoptosis activation in cancer cells. This interaction uncovers a new layer in the highly complex regulation of cell death in cancer cells and opens new avenues of exploration into the development of novel anticancer drugs that reactivate apoptosis in malignant tumors.
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Affiliation(s)
- Anat Iosub-Amir
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
| | - Fang Bai
- Center for Theoretical Biological Physics , Department of Physics , Rice University , Houston , TX 77005 , USA .
| | - Yang-Sung Sohn
- The Alexander Silberman Institute of Life Science , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
| | - Luhua Song
- Department of Biological Sciences , University of North Texas , Denton , TX 76203 , USA
| | - Sagi Tamir
- The Alexander Silberman Institute of Life Science , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
| | - Henri-Baptiste Marjault
- The Alexander Silberman Institute of Life Science , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
| | - Guy Mayer
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
| | - Ola Karmi
- The Alexander Silberman Institute of Life Science , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
| | - Patricia A Jennings
- Department of Chemistry & Biochemistry , University of California at San Diego , La Jolla , CA 92093 , USA
| | - Ron Mittler
- Department of Surgery , University of Missouri School of Medicine , Christopher S. Bond Life Sciences Center , University of Missouri , 1201 Rollins St , Columbia , MO 65201 , USA
| | - José N Onuchic
- Center for Theoretical Biological Physics , Department of Physics , Rice University , Houston , TX 77005 , USA .
| | - Assaf Friedler
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
| | - Rachel Nechushtai
- The Alexander Silberman Institute of Life Science , The Hebrew University of Jerusalem , Edmond J. Safra Campus at Givat Ram , Jerusalem 91904 , Israel .
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20
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Chan KK, Wong OGW, Wong ESY, Chan KKL, Ip PPC, Tse KY, Cheung ANY. Impact of iASPP on chemoresistance through PLK1 and autophagy in ovarian clear cell carcinoma. Int J Cancer 2018; 143:1456-1469. [PMID: 29663364 DOI: 10.1002/ijc.31535] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/15/2018] [Accepted: 03/13/2018] [Indexed: 12/17/2023]
Abstract
Ovarian clear cell carcinoma (OCCC) is a type of epithelial ovarian cancer that is strongly associated with endometriosis, resistance against conventional chemotherapy and thus poorer prognosis. The expression of inhibitory member of the ASPP family proteins (iASPP) and Polo-like kinase (PLK)1 were significantly higher in OCCC compared to benign cystadenomas and endometriosis. Both protein expressions were found to correlate with chemoresistance in patients with OCCC while high iASPP expression alone was significantly associated with a poor patient survival. The growth of OCCC cell lines, OVTOKO and KK, were inhibited after iASPP silencing. Such effect was related to senescence triggering as evidenced by increased SA-β-Gal staining and p21WAF1/Cip1 expression. Moreover, knockdown of iASPP induced PLK1 downregulation, whereas either genes' silencing sensitized the cells in response to cisplatin treatment. More prominent apoptosis was induced by cisplatin in OCCC cells after the knockdown of either iASPP or PLK1 as evidenced by the formation of more cleaved caspase 3. Heightened chemosensitivity to cisplatin after iASPP knockdown was further demonstrated in in vivo xenograft model. Additionally, both iASPP and PLK1 were shown to regulate autophagic flux as the induction of LC3B-II and LC3 puncta were much less in OCCC cells with either knockdown. Importantly, inhibition of autophagy also enhanced chemosensitivity to cisplatin in OCCC cells. These findings strongly imply that iASPP and PLK1 affect the chemoresistance of OCCC via the regulation of autophagy and apoptosis. Both iASPP and PLK1 can be potential therapeutic targets for treating OCCC in combination with conventional chemotherapy.
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MESH Headings
- Adenocarcinoma, Clear Cell/drug therapy
- Adenocarcinoma, Clear Cell/metabolism
- Adenocarcinoma, Clear Cell/pathology
- Animals
- Antineoplastic Agents/pharmacology
- Apoptosis
- Autophagy
- Biomarkers, Tumor/genetics
- Biomarkers, Tumor/metabolism
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/metabolism
- Cell Proliferation
- Cisplatin/pharmacology
- Drug Resistance, Neoplasm
- Female
- Follow-Up Studies
- Gene Expression Regulation, Neoplastic
- Humans
- Intracellular Signaling Peptides and Proteins/genetics
- Intracellular Signaling Peptides and Proteins/metabolism
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- Ovarian Neoplasms/drug therapy
- Ovarian Neoplasms/metabolism
- Ovarian Neoplasms/pathology
- Prognosis
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Signal Transduction
- Survival Rate
- Tumor Cells, Cultured
- Xenograft Model Antitumor Assays
- Polo-Like Kinase 1
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Affiliation(s)
- Ka-Kui Chan
- Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong Island, Hong Kong
| | - Oscar Gee-Wan Wong
- Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong Island, Hong Kong
| | - Esther Shuk-Ying Wong
- Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong Island, Hong Kong
| | - Karen Kar-Loen Chan
- Department of Obstetrics and Gynaecology, The University of Hong Kong, Queen Mary Hospital, Hong Kong Island, Hong Kong
| | - Philip Pun-Ching Ip
- Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong Island, Hong Kong
| | - Ka-Yu Tse
- Department of Obstetrics and Gynaecology, The University of Hong Kong, Queen Mary Hospital, Hong Kong Island, Hong Kong
| | - Annie Nga-Yin Cheung
- Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Hong Kong Island, Hong Kong
- Department of Pathology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China
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21
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Liu K, Yao H, Lei S, Xiong L, Qi H, Qian K, Liu J, Wang P, Zhao H. The miR-124-p63 feedback loop modulates colorectal cancer growth. Oncotarget 2018; 8:29101-29115. [PMID: 28418858 PMCID: PMC5438716 DOI: 10.18632/oncotarget.16248] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 02/20/2017] [Indexed: 12/26/2022] Open
Abstract
Among the diverse co-regulatory relationships between transcription factors (TFs) and microRNAs (miRNAs), feedback loops have received the most extensive research attention. The co-regulation of TFs and miRNAs plays an important role in colorectal cancer (CRC) growth. Here, we show that miR-124 can regulate two isoforms of p63, TAp63 and ΔNp63, via iASPP, while p63 modulates signal transducers and activators of transcription 1 (STAT1) expression by targeting miR-155. Moreover, STAT1 acts as a regulator of CRC growth by targeting miR-124. Taken together, these results reveal a feedback loop between miRNAs and TFs. This feedback loop comprises miR-124, iASPP, STAT1, miR-155, TAp63 and ΔNp63, which are essential for CRC growth. Moreover, this feedback loop is perturbed in human colon carcinomas, which suggests that the manipulation of this microRNA-TF feedback loop has therapeutic potential for CRC.
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Affiliation(s)
- Kuijie Liu
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Hongliang Yao
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Sanlin Lei
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Li Xiong
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Haizhi Qi
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Ke Qian
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Jiqiang Liu
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Peng Wang
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
| | - Hua Zhao
- Department of General Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, China
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22
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Li N, Xie C, Lu NH. p53, a potential predictor of Helicobacter pylori infection-associated gastric carcinogenesis? Oncotarget 2018; 7:66276-66286. [PMID: 27556187 PMCID: PMC5323233 DOI: 10.18632/oncotarget.11414] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Accepted: 08/13/2016] [Indexed: 12/14/2022] Open
Abstract
Helicobacter pylori (H. pylori) is an ancient and persistent inhabitant of the human stomach that is closely linked to the development of gastric cancer (GC). . Emerging evidence suggests that H. pylori strain interactions with gastric epithelial cells subvert the best- characterized p53 tumour suppressor pathway. A high prevalence of p53 mutations is related to H. pylori infection. H. pylori also accelerates p53 protein degradation by disturbing the MDM2-P53 feedback loop. Additionally, H. pylori triggers the alteration of other p53 isoforms. Dysregulation of p53 by H. pylori infection contributes to gastric carcinogenesis by mediating cell proliferation and apoptosis. This review focuses on the regulation of p53 in H. pylori infection-associated GC.
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Affiliation(s)
- Nianshuang Li
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Chuan Xie
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Nong-Hua Lu
- Department of Gastroenterology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
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23
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Dedeić Z, Sutendra G, Hu Y, Chung K, Slee EA, White MJ, Zhou FY, Goldin RD, Ferguson DJP, McAndrew D, Schneider JE, Lu X. Cell autonomous role of iASPP deficiency in causing cardiocutaneous disorders. Cell Death Differ 2018; 25:1289-1303. [PMID: 29352264 DOI: 10.1038/s41418-017-0039-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 10/20/2017] [Accepted: 10/30/2017] [Indexed: 12/13/2022] Open
Abstract
Desmosome components are frequently mutated in cardiac and cutaneous disorders in animals and humans and enhanced inflammation is a common feature of these diseases. Previous studies showed that inhibitor of Apoptosis Stimulating p53 Protein (iASPP) regulates desmosome integrity at cell-cell junctions and transcription in the nucleus, and its deficiency causes cardiocutaneous disorder in mice, cattle, and humans. As iASPP is a ubiquitously expressed shuttling protein with multiple functions, a key question is whether the observed cardiocutaneous phenotypes are caused by loss of a cell autonomous role of iASPP in cardiomyocytes and keratinocytes specifically or by a loss of iASPP in other cell types such as immune cells. To address this, we developed cardiomyocyte-specific and keratinocyte-specific iASPP-deficient mouse models and show that the cell-type specific loss of iASPP in cardiomyocytes or keratinocytes is sufficient to induce cardiac or cutaneous disorders, respectively. Additionally, keratinocyte-specific iASPP-deficient mice have delayed eyelid development and wound healing. In keratinocytes, junctional iASPP is critical for stabilizing desmosomes and iASPP deficiency results in increased and disorganized cell migration, as well as impaired cell adhesion, consistent with delayed wound healing. The identification of a cell autonomous role of iASPP deficiency in causing cardiocutaneous syndrome, impaired eyelid development and wound healing suggests that variants in the iASPP gene also may contribute to polygenic heart and skin diseases.
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Affiliation(s)
- Zinaida Dedeić
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Gopinath Sutendra
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.,Department of Medicine, University of Alberta, Edmonton, Alberta, T6G 2B7, Canada
| | - Ying Hu
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.,The School of Life Science and Technology, Harbin Institute of Technology, Harbin, 1500080, China
| | - Kathryn Chung
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Elizabeth A Slee
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Michael J White
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Felix Y Zhou
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Robert D Goldin
- Centre for Pathology, St. Mary's Hospital, Imperial College, London, W2 1NY, UK
| | - David J P Ferguson
- Nuffield Department of Clinical Laboratory Science, University of Oxford, Oxford, OX3 9DU, UK
| | - Debra McAndrew
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 7BN, UK
| | - Jurgen E Schneider
- Division of Biomedical Imaging, Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.
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24
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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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25
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Gan W, Zhao H, Li T, Liu K, Huang J. CDK1 interacts with iASPP to regulate colorectal cancer cell proliferation through p53 pathway. Oncotarget 2017; 8:71618-71629. [PMID: 29069733 PMCID: PMC5641076 DOI: 10.18632/oncotarget.17794] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 04/26/2017] [Indexed: 01/19/2023] Open
Abstract
CDK1 (cyclin-dependent kinase 1) is a critical regulator of the G2-M checkpoint. CDK1 is considered a possible target for cancer treatment. In addition to CDK1, iASPP plays essential role in maintaining cancer cell proliferation. In the present study, we monitored the expression of CDK1 and iASPP at mRNA and protein levels in CRC tissues and cell lines; we also predicted that iASPP protein might interact with CDK1 protein. By performing GST pull-down assay and Co-IP assay, we confirmed the interaction of CDK1 and iASPP protein. In CRC cell lines, CDK1 interacted with iASPP to affect CRC cell proliferation and apoptosis; moreover, the p53 apoptosis pathway was involved in this progression. Taken together, we revealed that CDK1 and iASPP was up-regulated in CRC tissues and cell lines; CDK1 protein interacted with iASPP protein to affect CRC cell proliferation and apoptosis through the p53 apoptosis pathway. CDK1 and iASPP might serve as not only promising targets in CRC treatment, but also efficient prognostic markers. From the perspective of protein interactions, we provided a novel theoretical basis for targeted therapy of CRC.
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Affiliation(s)
- Wei Gan
- Department of General Surgery, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Hua Zhao
- Department of General Surgery, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Tiegang Li
- Department of General Surgery, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Kuijie Liu
- Department of General Surgery, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Jiangsheng Huang
- Department of Minimally Invasive Surgery, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
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26
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Liang S, Gong X, Zhang G, Huang G, Lu Y, Li Y. MicroRNA-140 regulates cell growth and invasion in pancreatic duct adenocarcinoma by targeting iASPP. Acta Biochim Biophys Sin (Shanghai) 2016; 48:174-81. [PMID: 26787707 DOI: 10.1093/abbs/gmv127] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 11/21/2015] [Indexed: 12/16/2022] Open
Abstract
MicroRNAs are ∼22 nucleotide RNAs processed from RNA hairpin structures that play important roles in regulating protein expression level via binding to mRNA, either suppressing its translation or speeding up its degradation. In humans, they regulate most protein-coding genes, including genes important in cancer and other diseases. In this study, the expression of microRNA-140 (miR-140) was demonstrated to be significantly suppressed in pancreatic duct adenocarcinoma specimens and cell lines, compared with their adjacent normal tissues. With the help of bioinformatics analysis, inhibitor of apoptosis-stimulating protein of p53 (iASPP) was identified to be a direct target of miR-140, and luciferase reporter experiment confirmed this discovery. Overexpression of miR-140 decreases the protein expressions of iASPP, ΔNp63, MMP2, and MMP9. Growth and invasion of PANC-1 cells were attenuated by overexpression of miR-140 in vitro. The suppressive effect of miR-140 on PANC-1 cell line could be partly balanced out by manual overexpression of iASPP. Above all, these findings provided insights into the functional mechanism of miR-140, suggested that the miR-140/iASPP axis may interfere with the proliferative and invasive property of pancreatic duct adenocarcinoma cells, and indicated that miR-140 could be a potential therapeutic target for pancreatic duct adenocarcinoma.
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Affiliation(s)
- Shuai Liang
- Department of Pancreatic Biliary Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Xuejun Gong
- Department of Pancreatic Biliary Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Gewen Zhang
- Department of Pancreatic Biliary Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Gengwen Huang
- Department of Pancreatic Biliary Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yebin Lu
- Department of Pancreatic Biliary Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yixiong Li
- Department of Pancreatic Biliary Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
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27
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Hu Y, Ge W, Wang X, Sutendra G, Zhao K, Dedeić Z, Slee EA, Baer C, Lu X. Caspase cleavage of iASPP potentiates its ability to inhibit p53 and NF-κB. Oncotarget 2015; 6:42478-90. [PMID: 26646590 PMCID: PMC4767446 DOI: 10.18632/oncotarget.6478] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 11/25/2015] [Indexed: 12/14/2022] Open
Abstract
An intriguing biological question relating to cell signaling is how the inflammatory mediator NF-kB and the tumour suppressor protein p53 can be induced by similar triggers, like DNA damage or infection, yet have seemingly opposing or sometimes cooperative biological functions. For example, the NF-κB subunit RelA/p65 has been shown to inhibit apoptosis, whereas p53 induces apoptosis. One potential explanation may be their co-regulation by common cellular factors: inhibitor of Apoptosis Stimulating p53 Protein (iASPP) is one such common regulator of both RelA/p65 and p53. Here we show that iASPP is a novel substrate of caspases in response to apoptotic stimuli. Caspase cleaves the N-terminal region of iASPP at SSLD294 resulting in a prominent 80kDa fragment of iASPP. This caspase cleavage site is conserved in various species from zebrafish to Homo sapiens. The 80kDa fragment of iASPP translocates from the cytoplasm to the nucleus via the RaDAR nuclear import pathway, independent of p53. The 80kDa iASPP fragment can bind and inhibit p53 or RelA/p65 more efficiently than full-length iASPP. Overall, these data reveal a potential novel regulation of p53 and RelA/p65 activities in response to apoptotic stimuli.
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Affiliation(s)
- Ying Hu
- The School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Wenjie Ge
- The School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Xingwen Wang
- The School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Gopinath Sutendra
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Kunming Zhao
- The School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Zinaida Dedeić
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Elizabeth A. Slee
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Caroline Baer
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research Ltd., Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK
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28
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Highly homologous proteins exert opposite biological activities by using different interaction interfaces. Sci Rep 2015; 5:11629. [PMID: 26130271 PMCID: PMC4486954 DOI: 10.1038/srep11629] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 06/02/2015] [Indexed: 11/08/2022] Open
Abstract
We present a possible molecular basis for the opposite activity of two homologues proteins that bind similar ligands and show that this is achieved by fine-tuning of the interaction interface. The highly homologous ASPP proteins have opposite roles in regulating apoptosis: ASPP2 induces apoptosis while iASPP inhibits it. The ASPP proteins are regulated by an autoinhibitory interaction between their Ank-SH3 and Pro domains. We performed a detailed biophysical and molecular study of the Pro - Ank-SH3 interaction in iASPP and compared it to the interaction in ASPP2. We found that iASPP Pro is disordered and that the interaction sites are entirely different: iASPP Ank-SH3 binds iASPP Pro via its fourth Ank repeat and RT loop while ASPP2 Ank-SH3 binds ASPP2 Pro via its first Ank repeat and the n-src loop. It is possible that by using different moieties in the same interface, the proteins can have distinct and specific interactions resulting in differential regulation and ultimately different biological activities.
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29
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A Screen for Extracellular Signal-Regulated Kinase-Primed Glycogen Synthase Kinase 3 Substrates Identifies the p53 Inhibitor iASPP. J Virol 2015; 89:9232-41. [PMID: 26109723 DOI: 10.1128/jvi.01072-15] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 06/19/2015] [Indexed: 12/16/2022] Open
Abstract
UNLABELLED The Kaposi's sarcoma-associated herpesvirus (KSHV) LANA protein is essential for the replication and maintenance of virus genomes in latently KSHV-infected cells. LANA also drives dysregulated cell growth through a multiplicity of mechanisms that include altering the activity of the cellular kinases extracellular signal-regulated kinase (ERK) and glycogen synthase kinase 3 (GSK-3). To investigate the potential impact of these changes in enzyme activity, we used protein microarrays to identify cell proteins that were phosphorylated by the combination of ERK and GSK-3. The assays identified 58 potential ERK-primed GSK-3 substrates, of which 23 had evidence for in vivo phosphorylation in mass spectrometry databases. Two of these, SMAD4 and iASPP, were selected for further analysis and were confirmed as ERK-primed GSK-3 substrates. Cotransfection experiments revealed that iASPP, but not SMAD4, was targeted for degradation in the presence of GSK-3. iASPP interferes with apoptosis induced by p53 family members. To determine the importance of iASPP to KSHV-infected-cell growth, primary effusion lymphoma (PEL) cells were treated with an iASPP inhibitor in the presence or absence of the MDM2 inhibitor Nutlin-3. Drug inhibition of iASPP activity induced apoptosis in BC3 and BCBL1 PEL cells but did not induce poly(ADP-ribose) polymerase (PARP) cleavage in virus-negative BJAB cells. The effect of iASPP inhibition was additive with that of Nutlin-3. Interfering with iASPP function is therefore another mechanism that can sensitize KSHV-positive PEL cells to cell death. IMPORTANCE KSHV is associated with several malignancies, including primary effusion lymphoma (PEL). The KSHV-encoded LANA protein is multifunctional and promotes both cell growth and resistance to cell death. LANA is known to activate ERK and limit the activity of another kinase, GSK-3. To discover ways in which LANA manipulation of these two kinases might impact PEL cell survival, we screened a human protein microarray for ERK-primed GSK-3 substrates. One of the proteins identified, iASPP, showed reduced levels in the presence of GSK-3. Further, blocking iASPP activity increased cell death, particularly in p53 wild-type BC3 PEL cells.
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30
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Wang LL, Xu Z, Peng Y, Li LC, Wu XL. Downregulation of inhibitor of apoptosis‑stimulating protein of p53 inhibits proliferation and promotes apoptosis of gastric cancer cells. Mol Med Rep 2015; 12:1653-8. [PMID: 25846425 PMCID: PMC4464437 DOI: 10.3892/mmr.2015.3587] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 02/09/2015] [Indexed: 12/13/2022] Open
Abstract
Gastric cancer (GC) remains one of the leading causes of cancer-associated mortality. Inhibitor of apoptosis-stimulating protein of p53 (iASPP) is a member of the inhibitory apoptosis-stimulating protein p53 family. The overexpression of iASPP has been detected in several types of tumor in humans. However, the role of iASPP in GC remains to be elucidated. The objectives of the present study were to detect the expression of iASPP in GC and examine the potential role of iASPP in GC cell lines. Using reverse transcription-quantitative polymerase chain reaction and western blot analyses, it was identified that the expression of iASPP in GC tissues and GC cell lines was higher compared with that in adjacent normal tissues and in a normal gastric mucosa cell line (GES-1). To examine the role of iASPP in GC cells, the expression of iASPP was inhibited using a small interfering (si)RNA against iASPP and it was observed that iASPP expression was significantly downregulated. Using MTT assays, colony-formation assays and flow cytometry, it was identified that the inhibition of iASPP was able to significantly inhibit the proliferation and colony forming ability and promote apoptosis in GC cells. To examine the role of iASPP in GC cells in vivo, GC cells, which were infected with iASPP-siRNA or control-siRNA were subcutaneously injected into nude mice. It was identified that downregulation of iASPP significantly inhibited tumor growth in vivo. Thus, iASPP may be a potential molecular target in GC therapy.
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Affiliation(s)
- Lu-Lu Wang
- Department of Gastroenterology, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
| | - Zhong Xu
- Department of Gastroenterology, Guizhou Provincial People's Hospital, The Affiliated People's Hospital of Guiyang Medical University, Guiyang, Guizhou 550002, P.R. China
| | - Yang Peng
- Department of Gastroenterology, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
| | - Lu-Chun Li
- Department of Gastroenterology, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
| | - Xiao-Ling Wu
- Department of Gastroenterology, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
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31
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iASPP, a previously unidentified regulator of desmosomes, prevents arrhythmogenic right ventricular cardiomyopathy (ARVC)-induced sudden death. Proc Natl Acad Sci U S A 2015; 112:E973-81. [PMID: 25691752 DOI: 10.1073/pnas.1408111112] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Desmosomes are anchoring junctions that exist in cells that endure physical stress such as cardiac myocytes. The importance of desmosomes in maintaining the homeostasis of the myocardium is underscored by frequent mutations of desmosome components found in human patients and animal models. Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a phenotype caused by mutations in desmosomal components in ∼ 50% of patients, however, the causes in the remaining 50% of patients still remain unknown. A deficiency of inhibitor of apoptosis-stimulating protein of p53 (iASPP), an evolutionarily conserved inhibitor of p53, caused by spontaneous mutation recently has been associated with a lethal autosomal recessive cardiomyopathy in Poll Hereford calves and Wa3 mice. However, the molecular mechanisms that mediate this putative function of iASPP are completely unknown. Here, we show that iASPP is expressed at intercalated discs in human and mouse postmitotic cardiomyocytes. iASPP interacts with desmoplakin and desmin in cardiomyocytes to maintain the integrity of desmosomes and intermediate filament networks in vitro and in vivo. iASPP deficiency specifically induces right ventricular dilatation in mouse embryos at embryonic day 16.5. iASPP-deficient mice with exon 8 deletion (Ppp1r13l(Δ8/Δ8)) die of sudden cardiac death, displaying features of ARVC. Intercalated discs in cardiomyocytes from four of six human ARVC cases show reduced or loss of iASPP. ARVC-derived desmoplakin mutants DSP-1-V30M and DSP-1-S299R exhibit weaker binding to iASPP. These data demonstrate that by interacting with desmoplakin and desmin, iASPP is an important regulator of desmosomal function both in vitro and in vivo. This newly identified property of iASPP may provide new molecular insight into the pathogenesis of ARVC.
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Kong F, Shi X, Li H, Li P, Yu J, Li X, Chen J, Sun Y, Jia Y. Increased expression of iASPP correlates with poor prognosis in FIGO IA2-IIA cervical adenocarcinoma following a curative resection. Am J Cancer Res 2015; 5:1217-1224. [PMID: 26046000 PMCID: PMC4449449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 02/15/2015] [Indexed: 06/04/2023] Open
Abstract
BACKGROUND The function of iASPP (inhibitory member of the ASPP family) in cervical adenocarcinoma remains unknown. The aim of this study was to explore the expression and clinical relevance of iASPP in early stage cervical adenocarcinoma. Methods The clinical data of 75 patients with FIGO stage IA2-IIA cervical adenocarcinoma who were treated with radical hysterectomy from January 2004 to March 2008 was collected. The mRNA and protein expression levels of iASPP from the paired tumor specimens and adjacent normal cervical tissues were determined by real-time qRT-PCR and Western blot, and its relationship with clinicopathologic factors and prognosis of cervical cancer patients was retrospectively analyzed. RESULTS The mRNA and protein expression levels of iASPP were significantly elevated in cervical cancer tissues. The increased iASPP expression was correlated strongly with higher FIGO staging (p = 0.034), worse differentiation (p = 0.046), less pelvic lymph node metastasis (p = 0.014), and poor overall and disease-free survival of patients with cervical cancer (both P > 0.05). Multivariate Cox analysis indicated that high iASPP expression was an independent prognostic factor (P > 0.05). CONCLUSIONS This study demonstrates that iASPP is highly elevated in cervical adenocarcinoma, and that overexpression is an independent poor prognostic indicator for early stage cervical cancer patients, suggesting that iASPP might serve as a novel potential prognostic marker and therapeutic target for cervical adenocarcinoma.
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Affiliation(s)
- Fanming Kong
- Department of Oncology, First Teaching Hospital of Tianjin University of TCMAnshanxi Road, Nankai District, Tianjin 300193, China
| | - Xiaofeng Shi
- Department of ICU, Tianjin First Center HospitalFukang Road, Tianjin 300192, China
| | - Huzi Li
- Department of Oncology, First Teaching Hospital of Tianjin University of TCMAnshanxi Road, Nankai District, Tianjin 300193, China
| | - Pu Li
- Department of Oncology, Tianjin Central Hospital of Gynecology ObstetricsChangjiang Road, Nankai District, Tianjin 300100, China
| | - Jianchun Yu
- Department of Oncology, First Teaching Hospital of Tianjin University of TCMAnshanxi Road, Nankai District, Tianjin 300193, China
| | - XiaoJiang Li
- Department of Oncology, First Teaching Hospital of Tianjin University of TCMAnshanxi Road, Nankai District, Tianjin 300193, China
| | - Jun Chen
- Department of Oncology, First Teaching Hospital of Tianjin University of TCMAnshanxi Road, Nankai District, Tianjin 300193, China
| | - Yiyu Sun
- Department of Oncology, First Teaching Hospital of Tianjin University of TCMAnshanxi Road, Nankai District, Tianjin 300193, China
| | - Yingjie Jia
- Department of Oncology, First Teaching Hospital of Tianjin University of TCMAnshanxi Road, Nankai District, Tianjin 300193, China
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Wang Y, Bu F, Royer C, Serres S, Larkin JR, Soto MS, Sibson NR, Salter V, Fritzsche F, Turnquist C, Koch S, Zak J, Zhong S, Wu G, Liang A, Olofsen PA, Moch H, Hancock DC, Downward J, Goldin RD, Zhao J, Tong X, Guo Y, Lu X. ASPP2 controls epithelial plasticity and inhibits metastasis through β-catenin-dependent regulation of ZEB1. Nat Cell Biol 2014; 16:1092-104. [PMID: 25344754 DOI: 10.1038/ncb3050] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 09/10/2014] [Indexed: 12/16/2022]
Abstract
Epithelial to mesenchymal transition (EMT), and the reverse mesenchymal to epithelial transition (MET), are known examples of epithelial plasticity that are important in kidney development and cancer metastasis. Here we identify ASPP2, a haploinsufficient tumour suppressor, p53 activator and PAR3 binding partner, as a molecular switch of MET and EMT. ASPP2 contributes to MET in mouse kidney in vivo. Mechanistically, ASPP2 induces MET through its PAR3-binding amino-terminus, independently of p53 binding. ASPP2 prevents β-catenin from transactivating ZEB1, directly by forming an ASPP2-β-catenin-E-cadherin ternary complex and indirectly by inhibiting β-catenin's N-terminal phosphorylation to stabilize the β-catenin-E-cadherin complex. ASPP2 limits the pro-invasive property of oncogenic RAS and inhibits tumour metastasis in vivo. Reduced ASPP2 expression results in EMT, and is associated with poor survival in hepatocellular carcinoma and breast cancer patients. Hence, ASPP2 is a key regulator of epithelial plasticity that connects cell polarity to the suppression of WNT signalling, EMT and tumour metastasis.
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Affiliation(s)
- Yihua Wang
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Fangfang Bu
- 1] International Joint Cancer Institute &Eastern Hospital of Hepatobiliary Surgery, The Second Military Medical University, Shanghai 200433, China [2] PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, 28 Fuxing Road Beijing 100853, China
| | - Christophe Royer
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Sébastien Serres
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford OX3 7LE, UK
| | - James R Larkin
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford OX3 7LE, UK
| | - Manuel Sarmiento Soto
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford OX3 7LE, UK
| | - Nicola R Sibson
- Cancer Research UK and Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford OX3 7LE, UK
| | - Victoria Salter
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Florian Fritzsche
- 1] Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK [2] Institute of Surgical Pathology, University Hospital Zurich, CH-8091 Zurich, Switzerland
| | - Casmir Turnquist
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Sofia Koch
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Jaroslav Zak
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Shan Zhong
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Guobin Wu
- Guangxi Cancer Hospital, Guangxi Medical University, Guangxi 530021, China
| | - Anmin Liang
- Guangxi Cancer Hospital, Guangxi Medical University, Guangxi 530021, China
| | - Patricia A Olofsen
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Holger Moch
- Institute of Surgical Pathology, University Hospital Zurich, CH-8091 Zurich, Switzerland
| | - David C Hancock
- Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields London WC2A 3LY, UK
| | - Julian Downward
- Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields London WC2A 3LY, UK
| | - Robert D Goldin
- Centre for Pathology, St Mary's Hospital, Imperial College, London W2 1NY, UK
| | - Jian Zhao
- 1] International Joint Cancer Institute &Eastern Hospital of Hepatobiliary Surgery, The Second Military Medical University, Shanghai 200433, China [2] PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, 28 Fuxing Road Beijing 100853, China
| | - Xin Tong
- 1] International Joint Cancer Institute &Eastern Hospital of Hepatobiliary Surgery, The Second Military Medical University, Shanghai 200433, China [2] PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, 28 Fuxing Road Beijing 100853, China
| | - Yajun Guo
- 1] International Joint Cancer Institute &Eastern Hospital of Hepatobiliary Surgery, The Second Military Medical University, Shanghai 200433, China [2] PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, 28 Fuxing Road Beijing 100853, China
| | - Xin Lu
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
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Nuclear iASPP may facilitate prostate cancer progression. Cell Death Dis 2014; 5:e1492. [PMID: 25341046 PMCID: PMC4649527 DOI: 10.1038/cddis.2014.442] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 08/11/2014] [Accepted: 08/25/2014] [Indexed: 12/13/2022]
Abstract
One of the major challenges in prostate cancer (PCa) research is the identification of key players that control the progression of primary cancers to invasive and metastatic disease. The majority of metastatic PCa express wild-type p53, whereas loss of p63 expression, a p53 family member, is a common event. Here we identify inhibitor of apoptosis-stimulating protein of p53 (iASPP), a common cellular regulator of p53 and p63, as an important player of PCa progression. Detailed analysis of the prostate epithelium of iASPP transgenic mice, iASPPΔ8/Δ8 mice, revealed that iASPP deficiency resulted in a reduction in the number of p63 expressing basal epithelial cells compared with that seen in wild-type mice. Nuclear and cytoplasmic iASPP expression was greater in PCa samples compared with benign epithelium. Importantly nuclear iASPP associated with p53 accumulation in vitro and in vivo. A pair of isogenic primary and metastatic PCa cell lines revealed that nuclear iASPP is enriched in the highly metastatic PCa cells. Nuclear iASPP is often detected in PCa cells located at the invasive leading edge in vivo. Increased iASPP expression associated with metastatic disease and PCa-specific death in a clinical cohort with long-term follow-up. These results suggest that iASPP function is required to maintain the expression of p63 in normal basal prostate epithelium, and nuclear iASPP may inactivate p53 function and facilitate PCa progression. Thus iASPP expression may act as a predictive marker of PCa progression.
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Lu M, Zak J, Chen S, Sanchez-Pulido L, Severson DT, Endicott J, Ponting CP, Schofield CJ, Lu X. A code for RanGDP binding in ankyrin repeats defines a nuclear import pathway. Cell 2014; 157:1130-45. [PMID: 24855949 DOI: 10.1016/j.cell.2014.05.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 01/22/2014] [Accepted: 03/13/2014] [Indexed: 01/23/2023]
Abstract
Regulation of nuclear import is fundamental to eukaryotic biology. The majority of nuclear import pathways are mediated by importin-cargo interactions. Yet not all nuclear proteins interact with importins, necessitating the identification of a general importin-independent nuclear import pathway. Here, we identify a code that determines importin-independent nuclear import of ankyrin repeats (ARs), a structural motif found in over 250 human proteins with diverse functions. AR-containing proteins (ARPs) with a hydrophobic residue at the 13th position of two consecutive ARs bind RanGDP efficiently, and consequently enter the nucleus. This code, experimentally tested in 17 ARPs, predicts the nuclear-cytoplasmic localization of over 150 annotated human ARPs with high accuracy and is acquired by the most common familial melanoma-associated CDKN2A mutation, leading to nuclear accumulation of mutant p16ink4a. The RaDAR (RanGDP/AR) pathway represents a general importin-independent nuclear import pathway and is frequently used by AR-containing transcriptional regulators, especially those regulating NF-κB/p53.
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Affiliation(s)
- Min Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Jaroslav Zak
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Shuo Chen
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Luis Sanchez-Pulido
- MRC Functional Genomics Unit, Department of Physiology Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT, UK
| | - David T Severson
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK
| | - Jane Endicott
- Northern Institute for Cancer Research, University of Newcastle, Newcastle, NE2 4HH, UK
| | - Chris P Ponting
- MRC Functional Genomics Unit, Department of Physiology Anatomy and Genetics, University of Oxford, Oxford, OX1 3PT, UK
| | - Christopher J Schofield
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, OX3 7DQ, UK.
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Öhman T, Söderholm S, Hintsanen P, Välimäki E, Lietzén N, MacKintosh C, Aittokallio T, Matikainen S, Nyman TA. Phosphoproteomics combined with quantitative 14-3-3-affinity capture identifies SIRT1 and RAI as novel regulators of cytosolic double-stranded RNA recognition pathway. Mol Cell Proteomics 2014; 13:2604-17. [PMID: 24997996 DOI: 10.1074/mcp.m114.038968] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Viral double-stranded RNA (dsRNA) is the most important viral structure recognized by cytosolic pattern-recognition receptors of the innate immune system, and its recognition results in the activation of signaling cascades that stimulate the production of antiviral cytokines and apoptosis of infected cells. 14-3-3 proteins are ubiquitously expressed regulatory molecules that participate in a variety of cellular processes, and 14-3-3 protein-mediated signaling pathways are activated by cytoplasmic dsRNA in human keratinocytes. However, the functional role of 14-3-3 protein-mediated interactions during viral dsRNA stimulation has remained uncharacterized. Here, we used functional proteomics to identify proteins whose phosphorylation and interaction with 14-3-3 is modulated by dsRNA and to characterize the signaling pathways activated during cytosolic dsRNA-induced innate immune response in human HaCaT keratinocytes. Phosphoproteome analysis showed that several MAPK- and immune-response-related signaling pathways were activated after dsRNA stimulation. Interactome analysis identified RelA-associated inhibitor, high-mobility group proteins, and several proteins associated with host responses to viral infection as novel 14-3-3 target proteins. Functional studies showed that RelA-associated inhibitor regulated dsRNA-induced apoptosis and TNF production. Integrated network analyses of proteomic data revealed that sirtuin1 was a central molecule regulated by 14-3-3s during dsRNA stimulation. Further experiments showed that sirtuin 1 negatively regulated dsRNA-induced NFκB transcriptional activity, suppressed expression of antiviral cytokines, and protected cells from apoptosis in dsRNA-stimulated and encephalomyocarditis-virus-infected keratinocytes. In conclusion, our data highlight the importance of 14-3-3 proteins in antiviral responses and identify RelA-associated inhibitor and sirtuin 1 as novel regulators of antiviral innate immune responses.
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Affiliation(s)
- Tiina Öhman
- From the ‡Institute of Biotechnology, FI-00014 University of Helsinki, Helsinki, Finland
| | - Sandra Söderholm
- From the ‡Institute of Biotechnology, FI-00014 University of Helsinki, Helsinki, Finland; §Finnish Institute of Occupational Health, FI-00250 Helsinki, Finland
| | - Petteri Hintsanen
- ¶Institute for Molecular Medicine Finland (FIMM), FI-00014 University of Helsinki, Helsinki, Finland
| | - Elina Välimäki
- From the ‡Institute of Biotechnology, FI-00014 University of Helsinki, Helsinki, Finland; §Finnish Institute of Occupational Health, FI-00250 Helsinki, Finland
| | - Niina Lietzén
- From the ‡Institute of Biotechnology, FI-00014 University of Helsinki, Helsinki, Finland
| | - Carol MacKintosh
- **University of Dundee, Dundee, Scotland DD1 5EH, United Kingdom
| | - Tero Aittokallio
- ¶Institute for Molecular Medicine Finland (FIMM), FI-00014 University of Helsinki, Helsinki, Finland
| | - Sampsa Matikainen
- §Finnish Institute of Occupational Health, FI-00250 Helsinki, Finland
| | - Tuula A Nyman
- From the ‡Institute of Biotechnology, FI-00014 University of Helsinki, Helsinki, Finland;
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37
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Lu M, Miller P, Lu X. Restoring the tumour suppressive function of p53 as a parallel strategy in melanoma therapy. FEBS Lett 2014; 588:2616-21. [PMID: 24844434 DOI: 10.1016/j.febslet.2014.05.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 05/02/2014] [Accepted: 05/05/2014] [Indexed: 01/27/2023]
Abstract
The tumour suppressor p53 is a master sensor of stress and it controls the expression of hundreds to thousands of genes with diverse biological functions including cell cycle arrest, apoptosis, and senescence. Consequently p53 is the most mutated gene found in human cancer and p53 mutation rate varies from 5% to 95%. Importantly p53 activity is often inactivated in tumours expressing structurally wild type p53. Thus one of the major challenges in cancer research is to restore the tumour suppressive function of p53. Intensive studies in the past decade have demonstrated that in addition to mutation, p53 activities are largely regulated by cellular factors that control the expression level and/or transcriptional activities of p53. MDM2, MDM4, p14(ARF) and the ASPP family of proteins are among the most studied regulators of p53. With increased understanding of the complexity of p53 regulation, various p53 reactivating approaches are being developed. This review will focus on the recent understanding of p53 inactivation in melanoma and the approaches to reactivate p53 in preclinical studies. Recent success in the therapeutic targeting of the BRAFV600E oncogenic protein was accompanied with subsequent relapse caused by acquired drug resistance. Restoration of the tumour suppressive function of p53 presents a parallel cancer therapeutic opportunity alongside BRAFV600E inhibition. Thus targeted therapy and concurrent reactivation of p53 may be a fertile ground to achieve synergistic killing of the 50% of cancer cells that express structurally wild type p53.
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Affiliation(s)
- Min Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Paul Miller
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK.
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38
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Chikh A, Sanzà P, Raimondi C, Akinduro O, Warnes G, Chiorino G, Byrne C, Harwood CA, Bergamaschi D. iASPP is a novel autophagy inhibitor in keratinocytes. J Cell Sci 2014; 127:3079-93. [PMID: 24777476 DOI: 10.1242/jcs.144816] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The protein iASPP (encoded by PPP1R13L) is an evolutionarily conserved p53 inhibitor, the expression of which is often upregulated in human cancers. We have recently shown that iASPP is a crucial regulator of epidermal homeostasis. Here, we report that iASPP also acts as autophagy inhibitor in keratinocytes. Our data show that depletion of iASPP protects keratinocytes from apoptosis by modulating the expression of Noxa (also known as PMAIP1). In our model, iASPP expression can affect the fission-fusion cycle, mass and shape of mitochondria. iASPP-silenced keratinocytes display disorganization of cytosolic compartments and increased metabolic stress caused by deregulation of mTORC1 signaling. Moreover, increased levels of lipidated LC3 protein confirmed the activation of autophagy in iASPP-depleted cells. We have identified a novel mechanism modulating autophagy in keratinocytes that relies upon iASPP expression specifically reducing the interaction of Atg5-Atg12 with Atg16L1, an interaction that is essential for autophagosome formation or maturation. Using organotypic culture, we further explored the link between autophagy and differentiation, and we showed that impairing autophagy affects epidermal terminal differentiation. Our data provide an alternative mechanism to explain how epithelial integrity is maintained against environmental stressors and might also improve the understanding of the etiology of skin diseases that are characterized by defects in differentiation and DNA damage responses.
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Affiliation(s)
- Anissa Chikh
- Centre for Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Paolo Sanzà
- Centre for Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Claudio Raimondi
- Centre for Diabetes, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Olufolake Akinduro
- Centre for Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Gary Warnes
- Flow Cytometry Core Facility, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Giovanna Chiorino
- Cancer Genomic Laboratory, Edo ed Elvo Tempia Foundation, 13900 Biella, Italy
| | - Carolyn Byrne
- Centre for Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Catherine A Harwood
- Centre for Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
| | - Daniele Bergamaschi
- Centre for Cutaneous Research, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK
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ASPP2 suppresses squamous cell carcinoma via RelA/p65-mediated repression of p63. Proc Natl Acad Sci U S A 2013; 110:17969-74. [PMID: 24127607 DOI: 10.1073/pnas.1309362110] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Squamous cell carcinoma (SCC) is highly malignant and refractory to therapy. The majority of existing mouse SCC models involve multiple gene mutations. Very few mouse models of spontaneous SCC have been generated by a single gene deletion. Here we report a haploinsufficient SCC mouse model in which exon 3 of the Tp53BP2 gene (a p53 binding protein) was deleted in one allele in a BALB/c genetic background. Tp53BP2 encodes ASPP2 (ankyrin repeats, SH3 domain and protein rich region containing protein 2). Keratinocyte differentiation induces ASPP2 and its expression is inversely correlated with p63 protein in vitro and in vivo. Up-regulation of p63 expression is required for ASPP2(Δexon3/+) BALB/c mice to develop SCC, as heterozygosity of p63 but not p53 prevents them from developing it. Mechanistically, ASPP2 inhibits ΔNp63 expression through its ability to bind IκB and enhance nuclear Rel/A p65, a component of the NF-κB transcription complex, which mediates the repression of p63. Reduced ASPP2 expression associates with tumor metastasis and increased p63 expression in human head and neck SCCs. This study identifies ASPP2 as a tumor suppressor that suppresses SCC via inflammatory signaling through NF-κB-mediated repression of p63.
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40
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Tucci P, Porta G, Agostini M, Antonov A, Garabadgiu AV, Melino G, Willis AE. Rapamycin regulates biochemical metabolites. Cell Cycle 2013; 12:2454-67. [PMID: 23839040 PMCID: PMC3841324 DOI: 10.4161/cc.25450] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The mammalian target of rapamycin (mTOR) kinase is a master regulator of protein synthesis that couples nutrient sensing to cell growth, and deregulation of this pathway is associated with tumorigenesis. p53, and its less investigated family member p73, have been shown to interact closely with mTOR pathways through the transcriptional regulation of different target genes. To investigate the metabolic changes that occur upon inhibition of the mTOR pathway and the role of p73 in this response primary mouse embryonic fibroblast from control and TAp73(-/-) were treated with the macrocyclic lactone rapamycin. Extensive gas chromatography/mass spectrometry (GC/MS) and liquid chromatography/mass spectrometry (LC/MS/MS) analysis were used to obtain a rapamycin-dependent global metabolome profile from control or TAp73(-/-) cells. In total 289 metabolites involved in selective pathways were identified; 39 biochemical metabolites were found to be significantly altered, many of which are known to be associated with the cellular stress response.
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Affiliation(s)
- Paola Tucci
- Medical Research Council; Toxicology Unit; Leicester, UK; Department of Pharmacy, Health and Nutritional Sciences; University of Calabria; Rende, Cosenza, Italy
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41
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Lu M, Breyssens H, Salter V, Zhong S, Hu Y, Baer C, Ratnayaka I, Sullivan A, Brown NR, Endicott J, Knapp S, Kessler BM, Middleton MR, Siebold C, Jones EY, Sviderskaya EV, Cebon J, John T, Caballero OL, Goding CR, Lu X. Restoring p53 function in human melanoma cells by inhibiting MDM2 and cyclin B1/CDK1-phosphorylated nuclear iASPP. Cancer Cell 2013; 23:618-33. [PMID: 23623661 DOI: 10.1016/j.ccr.2013.03.013] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 10/05/2012] [Accepted: 03/15/2013] [Indexed: 12/20/2022]
Abstract
Nearly 90% of human melanomas contain inactivated wild-type p53, the underlying mechanisms for which are not fully understood. Here, we identify that cyclin B1/CDK1-phosphorylates iASPP, which leads to the inhibition of iASPP dimerization, promotion of iASPP monomer nuclear entry, and exposure of its p53 binding sites, leading to increased p53 inhibition. Nuclear iASPP is enriched in melanoma metastasis and associates with poor patient survival. Most wild-type p53-expressing melanoma cell lines coexpress high levels of phosphorylated nuclear iASPP, MDM2, and cyclin B1. Inhibition of MDM2 and iASPP phosphorylation with small molecules induced p53-dependent apoptosis and growth suppression. Concurrent p53 reactivation and BRAFV600E inhibition achieved additive suppression in vivo, presenting an alternative for melanoma therapy.
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Affiliation(s)
- Min Lu
- Ludwig Institute for Cancer Research, University of Oxford, Oxford OX3 7DQ, UK
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Janke K, Brockmeier U, Kuhlmann K, Eisenacher M, Nolde J, Meyer HE, Mairbäurl H, Metzen E. Factor inhibiting HIF-1 (FIH-1) modulates protein interactions of apoptosis-stimulating p53 binding protein 2 (ASPP2). J Cell Sci 2013; 126:2629-40. [PMID: 23606740 DOI: 10.1242/jcs.117564] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The asparaginyl hydroxylase factor inhibiting HIF-1 (FIH-1) is an important suppressor of hypoxia-inducible factor (HIF) activity. In addition to HIF-α, FIH-1 was previously shown to hydroxylate other substrates within a highly conserved protein interaction domain, termed the ankyrin repeat domain (ARD). However, to date, the biological role of FIH-1-dependent ARD hydroxylation could not be clarified for any ARD-containing substrate. The apoptosis-stimulating p53-binding protein (ASPP) family members were initially identified as highly conserved regulators of the tumour suppressor p53. In addition, ASPP2 was shown to be important for the regulation of cell polarity through interaction with partitioning defective 3 homolog (Par-3). Using mass spectrometry we identified ASPP2 as a new substrate of FIH-1 but inhibitory ASPP (iASPP) was not hydroxylated. We demonstrated that ASPP2 asparagine 986 (N986) is a single hydroxylation site located within the ARD. ASPP2 protein levels and stability were not affected by depletion or inhibition of FIH-1. However, FIH-1 depletion did lead to impaired binding of Par-3 to ASPP2 while the interaction between ASPP2 and p53, apoptosis and proliferation of the cancer cells were not affected. Depletion of FIH-1 and incubation with the hydroxylase inhibitor dimethyloxalylglycine (DMOG) resulted in relocation of ASPP2 from cell-cell contacts to the cytosol. Our data thus demonstrate that protein interactions of ARD-containing substrates can be modified by FIH-1-dependent hydroxylation. The large cellular pool of ARD-containing proteins suggests that FIH-1 can affect a broad range of cellular functions and signalling pathways under certain conditions, for example, in response to severe hypoxia.
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Affiliation(s)
- Kirsten Janke
- Institute of Physiology, Faculty of Medicine, University Duisburg-Essen, 45147 Essen, Germany
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Role of p63 and the Notch pathway in cochlea development and sensorineural deafness. Proc Natl Acad Sci U S A 2013; 110:7300-5. [PMID: 23589895 DOI: 10.1073/pnas.1214498110] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The ectodermal dysplasias are a group of inherited autosomal dominant syndromes associated with heterozygous mutations in the Tumor Protein p63 (TRP63) gene. Here we show that, in addition to their epidermal pathology, a proportion of these patients have distinct levels of deafness. Accordingly, p63 null mouse embryos show marked cochlea abnormalities, and the transactivating isoform of p63 (TAp63) protein is normally found in the organ of Corti. TAp63 transactivates hairy and enhancer of split 5 (Hes5) and atonal homolog 1 (Atoh1), components of the Notch pathway, known to be involved in cochlear neuroepithelial development. Strikingly, p63 null mice show morphological defects of the organ of Corti, with supernumerary hair cells, as also reported for Hes5 null mice. This phenotype is related to loss of a differentiation property of TAp63 and not to loss of its proapoptotic function, because cochleas in mice lacking the critical Bcl-2 homology domain (BH-3) inducers of p53- and p63-mediated apoptosis--Puma, Noxa, or both--are normal. Collectively, these data demonstrate that TAp63, acting via the Notch pathway, is crucial for the development of the organ of Corti, providing a molecular explanation for the sensorineural deafness in ectodermal dysplasia patients with TRP63 mutations.
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Metabolic effects of TiO2 nanoparticles, a common component of sunscreens and cosmetics, on human keratinocytes. Cell Death Dis 2013; 4:e549. [PMID: 23519118 PMCID: PMC3615742 DOI: 10.1038/cddis.2013.76] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The long-term health risks of nanoparticles remain poorly understood, which is a serious concern given their prevalence in the environment from increased industrial and domestic use. The extent to which such compounds contribute to cellular toxicity is unclear, and although it is known that induction of oxidative stress pathways is associated with this process, the proteins and the metabolic pathways involved with nanoparticle-mediated oxidative stress and toxicity are largely unknown. To investigate this problem further, the effect of TiO2 on the HaCaT human keratinocyte cell line was examined. The data show that although TiO2 does not affect cell cycle phase distribution, nor cell death, these nanoparticles have a considerable and rapid effect on mitochondrial function. Metabolic analysis was performed to identify 268 metabolites of the specific pathways involved and 85 biochemical metabolites were found to be significantly altered, many of which are known to be associated with the cellular stress response. Importantly, the uptake of nanoparticles into the cultured cells was restricted to phagosomes, TiO2 nanoparticles did not enter into the nucleus or any other cytoplasmic organelle. No other morphological changes were detected after 24-h exposure consistent with a specific role of mitochondria in this response.
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Elevated expression of iASPP correlates with poor prognosis and chemoresistance/radioresistance in FIGO Ib1-IIa squamous cell cervical cancer. Cell Tissue Res 2013; 352:361-9. [DOI: 10.1007/s00441-013-1569-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 01/16/2013] [Indexed: 02/04/2023]
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MicroRNA-124 regulates the proliferation of colorectal cancer cells by targeting iASPP. BIOMED RESEARCH INTERNATIONAL 2013; 2013:867537. [PMID: 23691514 PMCID: PMC3652105 DOI: 10.1155/2013/867537] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 02/24/2013] [Accepted: 02/27/2013] [Indexed: 01/17/2023]
Abstract
MicroRNAs are a class of small, noncoding RNAs that function as critical regulators of gene expression by targeting mRNAs for translational repression or degradation. In this study, we demonstrate that expression of microRNA-124 (miR-124) is significantly downregulated in colorectal cancer tissues and cell lines, compared to the matched adjacent tissues. We identified and confirmed inhibitor of apoptosis-stimulating protein of p53 (iASPP) as a novel, direct target of miR-124 using target prediction algorithms and luciferase reporter gene assays. Overexpression of miR-124 suppressed iASPP protein expression, upregulated expression of the downstream signaling molecule nuclear factor-kappa B (NF- κ B), and attenuated cell viability, proliferation, and colony formation in SW480 and HT-29 colorectal cancer cells in vitro. Forced overexpression of iASPP partly rescued the inhibitory effect of miR-124 on SW480 and HT29 cell proliferation. Taken together, these findings shed light on the role and mechanism of action of miR-124, indicate that the miR-124/iASPP axis can regulate the proliferation of colorectal cancer cells, and suggest that miR-124 may serve as a potential therapeutic target for colorectal cancer.
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Toonen J, Liang L, Sidjanin DJ. Waved with open eyelids 2 (woe2) is a novel spontaneous mouse mutation in the protein phosphatase 1, regulatory (inhibitor) subunit 13 like (Ppp1r13l) gene. BMC Genet 2012; 13:76. [PMID: 22928477 PMCID: PMC3469352 DOI: 10.1186/1471-2156-13-76] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Accepted: 07/24/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Waved with open eyelids 2 (woe2) is a novel autosomal recessive mouse mutation that arose spontaneously in our animal facility. Upon initial evaluation, mutant mice exhibited eyelids open at birth (EOB) and wavy fur phenotypes. The goals of this study were to phenotypically characterize the woe2 mice and to identify the gene harboring the mutation responsible for the woe2 phenotype. RESULTS Histological analysis of woe2 embryos identified the failure of embryonic eyelid closure. Clinical and histological analysis of woe2 adult eyes identified severe corneal opacities, abnormalities of the anterior segment of the eye, and the absence of meibomian glands. Abnormalities in the fur texture and the absence of meibomian glands prompted us to evaluate other epidermal appendages: skin, teeth, and nails--as well as lacrimal, mammary, salivary, sebaceous and sweat glands. No obvious morphological differences between WT and woe2 mice were identified in these tissues. However, the analysis of woe2 identified cardiac abnormalities. Positional cloning of the woe2 locus identified a 1308 bp deletion in the Ppp1r13l gene. The deletion resulted in an aberrant Ppp1r13l(Δexon9-11) transcript that lacks exons 9, 10 and 11 resulting in a premature stop and a loss of 223 amino acids from the C-terminal end of the putative mutant PPP1R13L protein. Immunohistological analysis during eye development identified expression of PPP1R13L in the palpebral epidermis, palpebral and bulbar conjunctiva, corneal epithelium and meibomian glands. CONCLUSIONS The woe2 mouse harbors a novel deletion within the Ppp1r13l gene, likely resulting in a complete loss of PPP1R13L function. Results from this study provide evidence that PPP1R13L has an essential role in embryonic eyelid closure as well in development of meibomian glands and the anterior segment of the eye. The woe2 mice are a useful model for investigation of the role of PPP1R13L, especially during ocular and eyelid development.
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Affiliation(s)
- Joseph Toonen
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Rd, Milwaukee, WI 53226, USA
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