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Ray Das S, Delahunt B, Lasham A, Li K, Wright D, Print C, Slatter T, Braithwaite A, Mehta S. Combining TP53 mutation and isoform has the potential to improve clinical practice. Pathology 2024; 56:473-483. [PMID: 38594116 DOI: 10.1016/j.pathol.2024.02.003] [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: 10/02/2023] [Revised: 01/21/2024] [Accepted: 02/06/2024] [Indexed: 04/11/2024]
Abstract
The clinical importance of assessing and combining data on TP53 mutations and isoforms is discussed in this article. It gives a succinct overview of the structural makeup and key biological roles of the isoforms. It then provides a comprehensive summary of the roles that p53 isoforms play in cancer development, therapy response and resistance. The review provides a summary of studies demonstrating the role of p53 isoforms as potential prognostic indicators. It further provides evidence on how the presence of TP53 mutations may affect one or more of these activities and the association of p53 isoforms with clinicopathological data in various tumour types. The review gives insight into the present diagnostic hurdles for identifying TP53 isoforms and makes recommendations to improve their evaluation. In conclusion, this review offers suggestions for enhancing the identification and integration of TP53 isoforms in conjunction with mutation data within the clinical context.
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Affiliation(s)
- Sankalita Ray Das
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Brett Delahunt
- Pathology and Molecular Medicine, University of Otago, Wellington, New Zealand
| | - Annette Lasham
- Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand; Maurice Wilkins Centre for Biodiscovery, University of Auckland, Auckland, New Zealand; Te Aka Mātauranga Matepukupuku (Centre for Cancer Research), University of Auckland, Auckland, New Zealand
| | - Kunyu Li
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand; Maurice Wilkins Centre for Biodiscovery, University of Auckland, Auckland, New Zealand
| | - Deborah Wright
- Department of Surgical Sciences, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Cristin Print
- Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand; Maurice Wilkins Centre for Biodiscovery, University of Auckland, Auckland, New Zealand; Te Aka Mātauranga Matepukupuku (Centre for Cancer Research), University of Auckland, Auckland, New Zealand
| | - Tania Slatter
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand; Maurice Wilkins Centre for Biodiscovery, University of Auckland, Auckland, New Zealand
| | - Antony Braithwaite
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand; Maurice Wilkins Centre for Biodiscovery, University of Auckland, Auckland, New Zealand
| | - Sunali Mehta
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand; Maurice Wilkins Centre for Biodiscovery, University of Auckland, Auckland, New Zealand.
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2
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Tao Y, Zhang Q, Wang H, Yang X, Mu H. Alternative splicing and related RNA binding proteins in human health and disease. Signal Transduct Target Ther 2024; 9:26. [PMID: 38302461 PMCID: PMC10835012 DOI: 10.1038/s41392-024-01734-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Revised: 12/18/2023] [Accepted: 12/27/2023] [Indexed: 02/03/2024] Open
Abstract
Alternative splicing (AS) serves as a pivotal mechanism in transcriptional regulation, engendering transcript diversity, and modifications in protein structure and functionality. Across varying tissues, developmental stages, or under specific conditions, AS gives rise to distinct splice isoforms. This implies that these isoforms possess unique temporal and spatial roles, thereby associating AS with standard biological activities and diseases. Among these, AS-related RNA-binding proteins (RBPs) play an instrumental role in regulating alternative splicing events. Under physiological conditions, the diversity of proteins mediated by AS influences the structure, function, interaction, and localization of proteins, thereby participating in the differentiation and development of an array of tissues and organs. Under pathological conditions, alterations in AS are linked with various diseases, particularly cancer. These changes can lead to modifications in gene splicing patterns, culminating in changes or loss of protein functionality. For instance, in cancer, abnormalities in AS and RBPs may result in aberrant expression of cancer-associated genes, thereby promoting the onset and progression of tumors. AS and RBPs are also associated with numerous neurodegenerative diseases and autoimmune diseases. Consequently, the study of AS across different tissues holds significant value. This review provides a detailed account of the recent advancements in the study of alternative splicing and AS-related RNA-binding proteins in tissue development and diseases, which aids in deepening the understanding of gene expression complexity and offers new insights and methodologies for precision medicine.
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Affiliation(s)
- Yining Tao
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 200000, Shanghai, China
- Shanghai Bone Tumor Institution, 200000, Shanghai, China
| | - Qi Zhang
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, 200000, Shanghai, China
| | - Haoyu Wang
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 200000, Shanghai, China
- Shanghai Bone Tumor Institution, 200000, Shanghai, China
| | - Xiyu Yang
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 200000, Shanghai, China
- Shanghai Bone Tumor Institution, 200000, Shanghai, China
| | - Haoran Mu
- Department of Orthopedics, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 200000, Shanghai, China.
- Shanghai Bone Tumor Institution, 200000, Shanghai, China.
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Du Y, Cao L, Wang S, Guo L, Tan L, Liu H, Feng Y, Wu W. Differences in alternative splicing and their potential underlying factors between animals and plants. J Adv Res 2023:S2090-1232(23)00354-5. [PMID: 37981087 DOI: 10.1016/j.jare.2023.11.017] [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: 05/07/2023] [Revised: 08/16/2023] [Accepted: 11/14/2023] [Indexed: 11/21/2023] Open
Abstract
BACKGROUND Alternative splicing (AS), a posttranscriptional process, contributes to the complexity of transcripts from a limited number of genes in a genome, and AS is considered a great source of genetic and phenotypic diversity in eukaryotes. In animals, AS is tightly regulated during the processes of cell growth and differentiation, and its dysregulation is involved in many diseases, including cancers. Likewise, in plants, AS occurs in all stages of plant growth and development, and it seems to play important roles in the rapid reprogramming of genes in response to environmental stressors. To date, the prevalence and functional roles of AS have been extensively reviewed in animals and plants. However, AS differences between animals and plants, especially their underlying molecular mechanisms and impact factors, are anecdotal and rarely reviewed. AIM OF REVIEW This review aims to broaden our understanding of AS roles in a variety of biological processes and provide insights into the underlying mechanisms and impact factors likely leading to AS differences between animals and plants. KEY SCIENTIFIC CONCEPTS OF REVIEW We briefly summarize the roles of AS regulation in physiological and biochemical activities in animals and plants. Then, we underline the differences in the process of AS between plants and animals and especially analyze the potential impact factors, such as gene exon/intron architecture, 5'/3' untranslated regions (UTRs), spliceosome components, chromatin dynamics and transcription speeds, splicing factors [serine/arginine-rich (SR) proteins and heterogeneous nuclear ribonucleoproteins (hnRNPs)], noncoding RNAs, and environmental stimuli, which might lead to the differences. Moreover, we compare the nonsense-mediated mRNA decay (NMD)-mediated turnover of the transcripts with a premature termination codon (PTC) in animals and plants. Finally, we summarize the current AS knowledge published in animals versus plants and discuss the potential development of disease therapies and superior crops in the future.
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Affiliation(s)
- Yunfei Du
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Lu Cao
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Shuo Wang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Liangyu Guo
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Lingling Tan
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Hua Liu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Ying Feng
- Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health (SINH), Chinese Academy of Sciences (CAS), Shanghai 200032, China.
| | - Wenwu Wu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China.
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Groen K, Steffens Reinhardt L, Bourdon JC, Avery-Kiejda KA. It is not all about the alpha: elevated expression of p53β variants is associated with lower probability of survival in a retrospective melanoma cohort. Cancer Cell Int 2023; 23:228. [PMID: 37794430 PMCID: PMC10548590 DOI: 10.1186/s12935-023-03083-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 09/23/2023] [Indexed: 10/06/2023] Open
Abstract
BACKGROUND Melanoma is the deadliest type of skin cancer and despite improvements in treatment outcomes, melanoma claimed 57,043 lives in 2020. In most malignancies, p53 mutation rates are above 50% and provide prognostic indications. However, in melanoma where less than a quarter of cases harbour a p53 mutation, the significance of the tumour suppressor may be questioned. Instead, p53 isoforms, which modulate p53's canonical function, may be of greater clinical importance. METHODS The expression of p53 isoforms was evaluated in 123 melanoma specimens by immunohistochemistry using p53 isoform-specific antibodies (DO-1, KJC8, KJC40, and KJC133). To determine whether TP53 mutations may be driving p53 isoform expression, TP53 was sequenced in 30 FFPE melanoma samples. RESULTS The C-terminally truncated p53β isoforms (KJC8) were found to be the most highly expressed p53 isoforms compared to all other isoforms. Further, elevated KJC8 staining was found to correlate with reduced probability of melanoma-specific survival, while KJC40 staining (Δ40p53) positively correlated with reduced melanoma thickness. TAp53 isoforms (p53 retaining both transactivation domains, DO-1), were the second highest p53 isoforms expressed across all samples. Elevated DO-1 staining was also associated with worse survival outcomes and more advanced stages of cancer. Given that the isoforms are likely to work in concert, composite isoform profiles were generated. Composite biomarker profiles revealed that elevated TAp53 (DO-1) and p53β (KJC8) expression, accompanied by low Δ40p53 (KJC40) and Δ133p53 (KJC133) expression was associated with the worst survival outcomes. Supporting the lack of predictive biomarker potential of TP53 in melanoma, no clinicopathological or p53 isoform expression associations could be linked to TP53 status. CONCLUSIONS Given the lack of prognostic biomarker potential derived from TP53 status, this study highlights how p53 isoform expression might progress this field and, pending further validation, may provide additional information to treating oncologists that might be factored into treatment decisions.
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Affiliation(s)
- Kira Groen
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, The University of Newcastle, Callaghan, NSW, Australia
- Hunter Medical Research Institute, Level 3 West, Lot 1 Kookaburra Circuit, New Lambton Heights, NSW, Australia
| | - Luiza Steffens Reinhardt
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, The University of Newcastle, Callaghan, NSW, Australia
- Hunter Medical Research Institute, Level 3 West, Lot 1 Kookaburra Circuit, New Lambton Heights, NSW, Australia
- Cancer Detection & Therapy Research Program, Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
| | - Jean-Christophe Bourdon
- School of Medicine, Ninewells Hospital and Medical School, The University of Dundee, Dundee, UK
| | - Kelly A Avery-Kiejda
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, The University of Newcastle, Callaghan, NSW, Australia.
- Hunter Medical Research Institute, Level 3 West, Lot 1 Kookaburra Circuit, New Lambton Heights, NSW, Australia.
- Cancer Detection & Therapy Research Program, Hunter Medical Research Institute, New Lambton Heights, NSW, Australia.
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Shen J, Wang Q, Mao Y, Gao W, Duan S. Targeting the p53 signaling pathway in cancers: Molecular mechanisms and clinical studies. MedComm (Beijing) 2023; 4:e288. [PMID: 37256211 PMCID: PMC10225743 DOI: 10.1002/mco2.288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 04/25/2023] [Accepted: 05/08/2023] [Indexed: 06/01/2023] Open
Abstract
Tumor suppressor p53 can transcriptionally activate downstream genes in response to stress, and then regulate the cell cycle, DNA repair, metabolism, angiogenesis, apoptosis, and other biological responses. p53 has seven functional domains and 12 splice isoforms, and different domains and subtypes play different roles. The activation and inactivation of p53 are finely regulated and are associated with phosphorylation/acetylation modification and ubiquitination modification, respectively. Abnormal activation of p53 is closely related to the occurrence and development of cancer. While targeted therapy of the p53 signaling pathway is still in its early stages and only a few drugs or treatments have entered clinical trials, the development of new drugs and ongoing clinical trials are expected to lead to the widespread use of p53 signaling-targeted therapy in cancer treatment in the future. TRIAP1 is a novel p53 downstream inhibitor of apoptosis. TRIAP1 is the homolog of yeast mitochondrial intermembrane protein MDM35, which can play a tumor-promoting role by blocking the mitochondria-dependent apoptosis pathway. This work provides a systematic overview of recent basic research and clinical progress in the p53 signaling pathway and proposes that TRIAP1 is an important therapeutic target downstream of p53 signaling.
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Affiliation(s)
- Jinze Shen
- Key Laboratory of Novel Targets and Drug Study for Neural Repair of Zhejiang ProvinceSchool of MedicineHangzhou City UniversityHangzhouZhejiangChina
| | - Qurui Wang
- Key Laboratory of Novel Targets and Drug Study for Neural Repair of Zhejiang ProvinceSchool of MedicineHangzhou City UniversityHangzhouZhejiangChina
| | - Yunan Mao
- Key Laboratory of Novel Targets and Drug Study for Neural Repair of Zhejiang ProvinceSchool of MedicineHangzhou City UniversityHangzhouZhejiangChina
| | - Wei Gao
- Key Laboratory of Novel Targets and Drug Study for Neural Repair of Zhejiang ProvinceSchool of MedicineHangzhou City UniversityHangzhouZhejiangChina
| | - Shiwei Duan
- Key Laboratory of Novel Targets and Drug Study for Neural Repair of Zhejiang ProvinceSchool of MedicineHangzhou City UniversityHangzhouZhejiangChina
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Wojtyś W, Oroń M. How Driver Oncogenes Shape and Are Shaped by Alternative Splicing Mechanisms in Tumors. Cancers (Basel) 2023; 15:cancers15112918. [PMID: 37296881 DOI: 10.3390/cancers15112918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 05/20/2023] [Accepted: 05/24/2023] [Indexed: 06/12/2023] Open
Abstract
The development of RNA sequencing methods has allowed us to study and better understand the landscape of aberrant pre-mRNA splicing in tumors. Altered splicing patterns are observed in many different tumors and affect all hallmarks of cancer: growth signal independence, avoidance of apoptosis, unlimited proliferation, invasiveness, angiogenesis, and metabolism. In this review, we focus on the interplay between driver oncogenes and alternative splicing in cancer. On one hand, oncogenic proteins-mutant p53, CMYC, KRAS, or PI3K-modify the alternative splicing landscape by regulating expression, phosphorylation, and interaction of splicing factors with spliceosome components. Some splicing factors-SRSF1 and hnRNPA1-are also driver oncogenes. At the same time, aberrant splicing activates key oncogenes and oncogenic pathways: p53 oncogenic isoforms, the RAS-RAF-MAPK pathway, the PI3K-mTOR pathway, the EGF and FGF receptor families, and SRSF1 splicing factor. The ultimate goal of cancer research is a better diagnosis and treatment of cancer patients. In the final part of this review, we discuss present therapeutic opportunities and possible directions of further studies aiming to design therapies targeting alternative splicing mechanisms in the context of driver oncogenes.
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Affiliation(s)
- Weronika Wojtyś
- Laboratory of Human Disease Multiomics, Mossakowski Medical Research Institute, Polish Academy of Sciences, Pawinskiego 5, 02-106 Warsaw, Poland
| | - Magdalena Oroń
- Laboratory of Human Disease Multiomics, Mossakowski Medical Research Institute, Polish Academy of Sciences, Pawinskiego 5, 02-106 Warsaw, Poland
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McCann JJ, Fleenor DE, Chen J, Lai CH, Bass TE, Kastan MB. Participation of ATM, SMG1, and DDX5 in a DNA Damage-Induced Alternative Splicing Pathway. Radiat Res 2023; 199:406-421. [PMID: 36921295 PMCID: PMC10162594 DOI: 10.1667/rade-22-00219.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 02/03/2023] [Indexed: 03/17/2023]
Abstract
Altered cellular responses to DNA damage can contribute to cancer development, progression, and therapeutic resistance. Mutations in key DNA damage response factors occur across many cancer types, and the DNA damage-responsive gene, TP53, is frequently mutated in a high percentage of cancers. We recently reported that an alternative splicing pathway induced by DNA damage regulates alternative splicing of TP53 RNA and further modulates cellular stress responses. Through damage-induced inhibition of the SMG1 kinase, TP53 pre-mRNA is alternatively spliced to generate TP53b mRNA and p53b protein is required for optimal induction of cellular senescence after ionizing radiation-induced DNA damage. Herein, we confirmed and extended these observations by demonstrating that the ATM protein kinase is required for repression of SMG1 kinase activity after ionizing radiation. We found that the RNA helicase and splicing factor, DDX5, interacts with SMG1, is required for alternative splicing of TP53 pre-mRNA to TP53b and TP53c mRNAs after DNA damage, and contributes to radiation-induced cellular senescence. Interestingly, the role of SMG1 in alternative splicing of p53 appears to be distinguishable from its role in regulating nonsense-mediated RNA decay. Thus, ATM, SMG1, and DDX5 participate in a DNA damage-induced alternative splicing pathway that regulates TP53 splicing and modulates radiation-induced cellular senescence.
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Affiliation(s)
- Jennifer J. McCann
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Donald E. Fleenor
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Jing Chen
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Chun-Hsiang Lai
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Thomas E. Bass
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Michael B. Kastan
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, North Carolina 27710
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8
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Steffens Reinhardt L, Groen K, Newton C, Avery-Kiejda KA. The role of truncated p53 isoforms in the DNA damage response. Biochim Biophys Acta Rev Cancer 2023; 1878:188882. [PMID: 36977456 DOI: 10.1016/j.bbcan.2023.188882] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 02/23/2023] [Accepted: 02/25/2023] [Indexed: 03/28/2023]
Abstract
The tumour suppressor p53 is activated following genotoxic stress and regulates the expression of target genes involved in the DNA damage response (DDR). The discovery that p53 isoforms alter the transcription of p53 target genes or p53 protein interactions unveiled an alternative DDR. This review will focus on the role p53 isoforms play in response to DNA damage. The expression of the C-terminally truncated p53 isoforms may be modulated via DNA damage-induced alternative splicing, whereas alternative translation plays an important role in modulating the expression of N-terminally truncated isoforms. The DDR induced by p53 isoforms may enhance the canonical p53 DDR or block cell death mechanisms in a DNA damage- and cell-specific manner, which could contribute to chemoresistance in a cancer context. Thus, a better understanding of the involvement of p53 isoforms in the cell fate decisions could uncover potential therapeutic targets in cancer and other diseases.
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Affiliation(s)
- Luiza Steffens Reinhardt
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, The University of Newcastle, Newcastle, NSW, Australia; Hunter Medical Research Institute, Newcastle, NSW, Australia
| | - Kira Groen
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, The University of Newcastle, Newcastle, NSW, Australia; Hunter Medical Research Institute, Newcastle, NSW, Australia
| | - Cheryl Newton
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, The University of Newcastle, Newcastle, NSW, Australia; Hunter Medical Research Institute, Newcastle, NSW, Australia
| | - Kelly A Avery-Kiejda
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, The University of Newcastle, Newcastle, NSW, Australia; Hunter Medical Research Institute, Newcastle, NSW, Australia.
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9
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Vlašić I, Horvat A, Tadijan A, Slade N. p53 Family in Resistance to Targeted Therapy of Melanoma. Int J Mol Sci 2022; 24:ijms24010065. [PMID: 36613518 PMCID: PMC9820688 DOI: 10.3390/ijms24010065] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/12/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022] Open
Abstract
Metastatic melanoma is one of the most aggressive tumors, with frequent mutations affecting components of the MAPK pathway, mainly protein kinase BRAF. Despite promising initial response to BRAF inhibitors, melanoma progresses due to development of resistance. In addition to frequent reactivation of MAPK or activation of PI3K/AKT signaling pathways, recently, the p53 pathway has been shown to contribute to acquired resistance to targeted MAPK inhibitor therapy. Canonical tumor suppressor p53 is inactivated in melanoma by diverse mechanisms. The TP53 gene and two other family members, TP63 and TP73, encode numerous protein isoforms that exhibit diverse functions during tumorigenesis. The p53 family isoforms can be produced by usage of alternative promoters and/or splicing on the C- and N-terminus. Various p53 family isoforms are expressed in melanoma cell lines and tumor samples, and several of them have already shown to have specific functions in melanoma, affecting proliferation, survival, metastatic potential, invasion, migration, and response to therapy. Of special interest are p53 family isoforms with increased expression and direct involvement in acquired resistance to MAPK inhibitors in melanoma cells, implying that modulating their expression or targeting their functional pathways could be a potential therapeutic strategy to overcome resistance to MAPK inhibitors in melanoma.
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10
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Amendolare A, Marzano F, Petruzzella V, Vacca RA, Guerrini L, Pesole G, Sbisà E, Tullo A. The Underestimated Role of the p53 Pathway in Renal Cancer. Cancers (Basel) 2022; 14:cancers14235733. [PMID: 36497215 PMCID: PMC9736171 DOI: 10.3390/cancers14235733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/10/2022] [Accepted: 11/18/2022] [Indexed: 11/24/2022] Open
Abstract
The TP53 tumor suppressor gene is known as the guardian of the genome, playing a pivotal role in controlling genome integrity, and its functions are lost in more than 50% of human tumors due to somatic mutations. This percentage rises to 90% if mutations and alterations in the genes that code for regulators of p53 stability and activity are taken into account. Renal cell carcinoma (RCC) is a clear example of cancer that despite having a wild-type p53 shows poor prognosis because of the high rate of resistance to radiotherapy or chemotherapy, which leads to recurrence, metastasis and death. Remarkably, the fact that p53 is poorly mutated does not mean that it is functionally active, and increasing experimental evidences have demonstrated this. Therefore, RCC represents an extraordinary example of the importance of p53 pathway alterations in therapy resistance. The search for novel molecular biomarkers involved in the pathways that regulate altered p53 in RCC is mandatory for improving early diagnosis, evaluating the prognosis and developing novel potential therapeutic targets for better RCC treatment.
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Affiliation(s)
- Alessandra Amendolare
- Department of Biosciences, Biotechnologies and Environment, University of Bari Aldo Moro, 70121 Bari, Italy
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council—CNR, 70126 Bari, Italy
| | - Flaviana Marzano
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council—CNR, 70126 Bari, Italy
| | - Vittoria Petruzzella
- Department of Translational Biomedicine and Neuroscience (DiBraiN), University of Bari Aldo Moro, 70121 Bari, Italy
| | - Rosa Anna Vacca
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council—CNR, 70126 Bari, Italy
| | - Luisa Guerrini
- Department of Biosciences, Università degli Studi di Milano, 20133 Milan, Italy
| | - Graziano Pesole
- Department of Biosciences, Biotechnologies and Environment, University of Bari Aldo Moro, 70121 Bari, Italy
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council—CNR, 70126 Bari, Italy
| | - Elisabetta Sbisà
- Institute of Biomedical Technologies, National Research Council—CNR, 70126 Bari, Italy
| | - Apollonia Tullo
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Research Council—CNR, 70126 Bari, Italy
- Correspondence: ; Tel.: +39-0805929672
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11
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Bareli Y, Shimon I, Tobar A, Rubinfeld H. PICT-1 regulates p53 splicing and sensitivity of medullary thyroid carcinoma cells to everolimus. J Neuroendocrinol 2022; 34:e13187. [PMID: 36306198 DOI: 10.1111/jne.13187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 04/12/2022] [Accepted: 05/31/2022] [Indexed: 11/28/2022]
Abstract
Protein interacting with carboxyl terminus 1 (PICT-1) is a nucleolar protein shown to act as a tumor suppressor that interacts with PTEN, or in a contrasting manner to facilitate the accessibility of p53 to ubiquitination and degradation, thus to function as an oncogene. The aim of the study was to examine the potential role of PICT-1 in neuroendocrine neoplasm (NEN) tumorigenesis and response to mTOR inhibitor treatment. PICT-1 was overexpressed in medullary thyroid (TT) and pancreatic (BON1) NEN cell lines using lentiviral vector. Whereas in BON1 cells PICT-1 overexpression exhibited no significant impact, in TT cells it induced the appearance of p53β lacking the C-terminus end. This was accompanied by a robust decrease in p21 expression and elevation of cell viability. Remarkably, PICT-1 overexpression completely reversed the reduction in cell viability of medullary thyroid neoplasm cells induced by everolimus, a therapeutic option for patients with progressive NENs. mTOR pathway investigations revealed that PICT-1 overexpression induced a reduction in PTEN expression and a robust increase in the expression level of phospho-Akt-Ser47 only partially inhibited by everolimus. These findings suggest a possible role of PICT-1 in the spliceosome machinery and provide functional involvement of PICT-1 in the complex network of mTOR.
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Affiliation(s)
- Yifat Bareli
- Institute of Endocrinology and Felsenstein Medical Research Center, Rabin Medical Center, Sackler School of Medicine, Tel Aviv University, Petach Tikva, Israel
| | - Ilan Shimon
- Institute of Endocrinology and Felsenstein Medical Research Center, Rabin Medical Center, Sackler School of Medicine, Tel Aviv University, Petach Tikva, Israel
| | - Ana Tobar
- Institute of Endocrinology and Felsenstein Medical Research Center, Rabin Medical Center, Sackler School of Medicine, Tel Aviv University, Petach Tikva, Israel
| | - Hadara Rubinfeld
- Institute of Endocrinology and Felsenstein Medical Research Center, Rabin Medical Center, Sackler School of Medicine, Tel Aviv University, Petach Tikva, Israel
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12
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Li Y, Wu M, Zhang L, Wan L, Li H, Zhang L, Sun G, Huang W, Zhang J, Su F, Tang M, Xiao F. Nonsense-mediated mRNA decay inhibition synergizes with MDM2 inhibition to suppress TP53 wild-type cancer cells in p53 isoform-dependent manner. Cell Death Dis 2022; 8:402. [PMID: 36180435 PMCID: PMC9525646 DOI: 10.1038/s41420-022-01190-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 09/08/2022] [Accepted: 09/14/2022] [Indexed: 11/23/2022]
Abstract
The restoration of the normal function of the tumour suppressors, such as p53, is an important strategy in tumour therapeutics. Nonsense-mediated mRNA decay (NMD) inhibition by NMD inhibitor (NMDi) upregulates functional p53 isoforms, p53β and p53γ, and activates the p53 pathway. XR-2, a novel mouse double minute 2 homolog (MDM2) inhibitor, can disrupt the interaction between p53 and MDM2, thus decreasing the MDM2-mediated degradation of p53 and increasing the p53 protein levels. However, the combined effects of these two agents have not been thoroughly explored. This study combined XR-2 and NMDi in four TP53 wild-types and four TP53-mutated cancer cell lines. The combination of these two agents achieved significant synergistic effects on TP53 wild-type cancer cell lines by transactivating p53 target genes, inducing apoptosis, cell-cycle arrest and DNA damage repair. The p53β isoform induced by NMDi enhances the transactivation ability of p53α induced by XR-2, which partially explains the mechanism of the synergistic effects of XR-2 and NMDi. This study identified a combination treatment of NMDi and XR-2 which could serve as a novel cancer therapeutic approach for MDM2-overexpressed TP53 wild-type cancers and delineated a future therapy based on the further reactivation of p53.
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Affiliation(s)
- Ying Li
- Clinical Biobank, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China.,Graduate School of Peking Union Medical College, 100730, Beijing, P. R. China.,The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Beijing Hospital, National Center of Gerontology, National Health Commission; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Meng Wu
- Department of Urology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Lili Zhang
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Beijing Hospital, National Center of Gerontology, National Health Commission; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Li Wan
- Clinical Biobank, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Hexin Li
- Clinical Biobank, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Lanxin Zhang
- Clinical Biobank, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Gaoyuan Sun
- Clinical Biobank, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Wei Huang
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Beijing Hospital, National Center of Gerontology, National Health Commission; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Junhua Zhang
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Beijing Hospital, National Center of Gerontology, National Health Commission; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Fei Su
- Clinical Biobank, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China
| | - Min Tang
- Department of Oncology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China.
| | - Fei Xiao
- Clinical Biobank, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China. .,Graduate School of Peking Union Medical College, 100730, Beijing, P. R. China. .,The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Beijing Hospital, National Center of Gerontology, National Health Commission; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, 100730, Beijing, P. R. China.
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13
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Lebecque B, Bourgne C, Munje C, Berger J, Tassin T, Cony-Makhoul P, Guerci-Bresler A, Johnson-Ansah H, Liu W, Saugues S, Tchirkov A, Vetrie D, Copland M, Berger MG. The Spliceosome: A New Therapeutic Target in Chronic Myeloid Leukaemia. Cancers (Basel) 2022; 14:cancers14194695. [PMID: 36230624 PMCID: PMC9563771 DOI: 10.3390/cancers14194695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 09/19/2022] [Accepted: 09/23/2022] [Indexed: 11/30/2022] Open
Abstract
Simple Summary RNA splicing factors are frequently altered in cancer and have been found mutated or deregulated in myeloid malignancies, justifying the growing interest in new therapeutic strategies. We recently showed that the DNA methylation alterations of CD34+CD15− chronic myeloid leukaemia (CML) cells affect alternative splicing genes, suggesting that spliceosome actors might be altered in chronic-phase (CP)-CML. We investigated the expression of 12 splicing genes in primary CP-CML CD34+ cells at diagnosis (n = 15). We found that CP-CML CD34+ cells had a distinct splicing signature profile, suggesting: (i) a spliceosome deregulation from the diagnosis time and (ii) an intraclonal heterogeneity. In vitro incubation of a spliceosome-targeted drug (TG003) showed that CP-CML CD34+ cells are spliceosome dependent; moreover, with the combination of TKI, the two drugs showing an additive effect while sparing healthy donors cells. Our results suggest that the spliceosome may be a new potential target for the treatment of CML. Abstract RNA splicing factors are frequently altered in cancer and can act as both oncoproteins and tumour suppressors. They have been found mutated or deregulated, justifying the growing interest in the targeting of splicing catalysis, splicing regulatory proteins, and/or specific, key altered splicing events. We recently showed that the DNA methylation alterations of CD34+CD15− chronic myeloid leukaemia (CML) cells affect, among others, alternative splicing genes, suggesting that spliceosome actors might be altered in chronic-phase (CP)-CML. We investigated the expression of 12 spliceosome genes known to be oncogenes or tumour suppressor genes in primary CP-CML CD34+ cells at diagnosis (n = 15). We found that CP-CML CD34+ cells had a distinct splicing signature profile as compared with healthy donor CD34+ cells or whole CP-CML cells, suggesting: (i) a spliceosome deregulation from the diagnosis time and (ii) an intraclonal heterogeneity. We could identify three profile types, but there was no relationship with a patient’s characteristics. By incubating cells with TKI and/or a spliceosome-targeted drug (TG003), we showed that CP-CML CD34+ cells are both BCR::ABL and spliceosome dependent, with the combination of the two drugs showing an additive effect while sparing healthy donors cells. Our results suggest that the spliceosome may be a new potential target for the treatment of CML.
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Affiliation(s)
- Benjamin Lebecque
- Hématologie Biologique, CHU Estaing, 63000 Clermont-Ferrand, France
- Equipe d’Accueil 7453 CHELTER, Université Clermont Auvergne, 63001 Clermont-Ferrand, France
- Correspondence: (B.L.); (M.G.B.); Tel.: +33-4-7375-0682 (M.G.B.); Fax: +33-4-7375-0683 (M.G.B.)
| | - Celine Bourgne
- Hématologie Biologique, CHU Estaing, 63000 Clermont-Ferrand, France
- Equipe d’Accueil 7453 CHELTER, Université Clermont Auvergne, 63001 Clermont-Ferrand, France
| | - Chinmay Munje
- Paul O’Gorman Leukaemia Research Centre, Institute of Cancer Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - Juliette Berger
- Hématologie Biologique, CHU Estaing, 63000 Clermont-Ferrand, France
- Equipe d’Accueil 7453 CHELTER, Université Clermont Auvergne, 63001 Clermont-Ferrand, France
| | - Thomas Tassin
- Hématologie Biologique, CHU Estaing, 63000 Clermont-Ferrand, France
- Equipe d’Accueil 7453 CHELTER, Université Clermont Auvergne, 63001 Clermont-Ferrand, France
| | - Pascale Cony-Makhoul
- CH Annecy-Genevois, 74374 Pringy, France
- Groupe Fi-LMC, Centre Léon Bérard, 69008 Lyon, France
| | - Agnès Guerci-Bresler
- Groupe Fi-LMC, Centre Léon Bérard, 69008 Lyon, France
- Hématologie Clinique, CHRU Brabois, 54500 Vandoeuvre-lès-Nancy, France
| | - Hyacinthe Johnson-Ansah
- Groupe Fi-LMC, Centre Léon Bérard, 69008 Lyon, France
- Institut d’Hématologie de Basse Normandie, CHU, 14033 Caen, France
| | - Wei Liu
- Wolfson Wohl Cancer Research Centre, Institute of Cancer Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - Sandrine Saugues
- Hématologie Biologique, CHU Estaing, 63000 Clermont-Ferrand, France
- Equipe d’Accueil 7453 CHELTER, Université Clermont Auvergne, 63001 Clermont-Ferrand, France
| | - Andrei Tchirkov
- Equipe d’Accueil 7453 CHELTER, Université Clermont Auvergne, 63001 Clermont-Ferrand, France
- Cytogénétique Médicale, CHU Clermont-Ferrand, CHU Estaing, 63000 Clermont-Ferrand, France
| | - David Vetrie
- Wolfson Wohl Cancer Research Centre, Institute of Cancer Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - Mhairi Copland
- Paul O’Gorman Leukaemia Research Centre, Institute of Cancer Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - Marc G. Berger
- Hématologie Biologique, CHU Estaing, 63000 Clermont-Ferrand, France
- Equipe d’Accueil 7453 CHELTER, Université Clermont Auvergne, 63001 Clermont-Ferrand, France
- Groupe Fi-LMC, Centre Léon Bérard, 69008 Lyon, France
- Correspondence: (B.L.); (M.G.B.); Tel.: +33-4-7375-0682 (M.G.B.); Fax: +33-4-7375-0683 (M.G.B.)
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14
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A Novel Role of SMG1 in Cholesterol Homeostasis That Depends Partially on p53 Alternative Splicing. Cancers (Basel) 2022; 14:cancers14133255. [PMID: 35805027 PMCID: PMC9265556 DOI: 10.3390/cancers14133255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/26/2022] [Accepted: 06/29/2022] [Indexed: 12/10/2022] Open
Abstract
Simple Summary p53 isoforms have been reported in various tumor types. Both p53β and p53γ were recently reported to retain functionalities of full-length p53α. A role for p53 and p53 loss in cholesterol metabolism has also emerged. We show that SMG1, a phosphatidylinositol 3-kinase-related kinase, when inhibited in p53 wild-type MCF7 and HepG2 cells, significantly alters the expression of cholesterol pathway genes, with a net increase in intracellular cholesterol and an increased sensitivity to Fatostatin in MCF7. We confirm a prior report that SMG1 inhibition in MCF7 cells promotes expression of p53β and show the first evidence for increases in p53γ. Further, induced p53β expression, confirmed with antibody, explained the loss of SMG1 upregulation of the ABCA1 cholesterol exporter where p53γ had no effect on ABCA1. Additionally, upregulation of ABCA1 upon SMG1 knockdown was independent of upregulation of nonsense-mediated decay target RASSF1C, previously suggested to regulate ABCA1 via a “RASSF1C-miR33a-ABCA1” axis. Abstract SMG1, a phosphatidylinositol 3-kinase-related kinase (PIKK), essential in nonsense-mediated RNA decay (NMD), also regulates p53, including the alternative splicing of p53 isoforms reported to retain p53 functions. We confirm that SMG1 inhibition in MCF7 tumor cells induces p53β and show p53γ increase. Inhibiting SMG1, but not UPF1 (a core factor in NMD), upregulated several cholesterol pathway genes. SMG1 knockdown significantly increased ABCA1, a cholesterol efflux pump shown to be positively regulated by full-length p53 (p53α). An investigation of RASSF1C, an NMD target, increased following SMG1 inhibition and reported to inhibit miR-33a-5p, a canonical ABCA1-inhibiting miRNA, did not explain the ABCA1 results. ABCA1 upregulation following SMG1 knockdown was inhibited by p53β siRNA with greatest inhibition when p53α and p53β were jointly suppressed, while p53γ siRNA had no effect. In contrast, increased expression of MVD, a cholesterol synthesis gene upregulated in p53 deficient backgrounds, was sensitive to combined targeting of p53α and p53γ. Phenotypically, we observed increased intracellular cholesterol and enhanced sensitivity of MCF7 to growth inhibitory effects of cholesterol-lowering Fatostatin following SMG1 inhibition. Our results suggest deregulation of cholesterol pathway genes following SMG1 knockdown may involve alternative p53 programming, possibly resulting from differential effects of p53 isoforms on cholesterol gene expression.
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15
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p53 Isoforms as Cancer Biomarkers and Therapeutic Targets. Cancers (Basel) 2022; 14:cancers14133145. [PMID: 35804915 PMCID: PMC9264937 DOI: 10.3390/cancers14133145] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 06/22/2022] [Indexed: 02/04/2023] Open
Abstract
Simple Summary The well-known tumor suppressor protein p53 plays important roles in tumor prevention through transcriptional regulation of its target genes. Reactivation of p53 activity has been a potent strategy for cancer treatment. Accumulating evidences indicate that p53 isoforms truncated/modified in the N- or C-terminus can modulate the p53 pathway in a p53-dependent or p53-independent manner. It is thus imperative to characterize the roles of the p53 isoforms in cancer development. This review illustrates how p53 isoforms participate in tumor development and/or suppression. It also summarizes the knowledge about the p53 isoforms as promising cancer biomarkers and therapeutic targets. Abstract This review aims to summarize the implications of the major isoforms of the tumor suppressor protein p53 in aggressive cancer development. The current knowledge of p53 isoforms, their involvement in cell-signaling pathways, and their interactions with other cellular proteins or factors suggests the existence of an intricate molecular network that regulates their oncogenic function. Moreover, existing literature about the involvement of the p53 isoforms in various cancers leads to the proposition of therapeutic solutions by altering the cellular levels of the p53 isoforms. This review thus summarizes how the major p53 isoforms Δ40p53α/β/γ, Δ133p53α/β/γ, and Δ160p53α/β/γ might have clinical relevance in the diagnosis and effective treatments of cancer.
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16
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p53 and Its Isoforms in Renal Cell Carcinoma—Do They Matter? Biomedicines 2022; 10:biomedicines10061330. [PMID: 35740352 PMCID: PMC9219959 DOI: 10.3390/biomedicines10061330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 05/25/2022] [Accepted: 05/28/2022] [Indexed: 11/17/2022] Open
Abstract
p53 is a transcription al factor responsible for the maintenance of cellular homeostasis. It has been shown that more than 50% of tumors are connected with mutations in the Tp53 gene. These mutations cause a disturbance in cellular response to stress, and eventually, cancer development. Apart from the full-length p53, at least twelve isoforms of p53 have been characterized. They are able to modulate p53 activity under stress conditions. In 2020, almost a half of million people around the world were diagnosed with renal cancer. One genetic disturbance which is linked to the most common type of kidney cancer, renal cell carcinoma, RCC, occurs from mutations in the VHL gene. Recent data has revealed that the VHL protein is needed to fully activate p53. Disturbance of the interplay between p53 and VHL seems to explain the lack of efficient response to chemotherapy in RCC. Moreover, it has been observed that changes in the expression of p53 isoforms are associated with different stages of RCC and overall survival. Thus, herein, an attempt was made to answer the question whether p53 and its isoforms are important factors in the development of RCC on the one hand, and in positive response to anti-RCC therapy on the other hand.
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17
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Rojas EA, Corchete LA, De Ramón C, Krzeminski P, Quwaider D, García‐Sanz R, Martínez‐López J, Oriol A, Rosiñol L, Bladé J, Lahuerta JJ, San Miguel JF, González M, Mateos MV, Bourdon J, Misiewicz‐Krzeminska I, Gutiérrez NC. Expression of p53 protein isoforms predicts survival in patients with multiple myeloma. Am J Hematol 2022; 97:700-710. [PMID: 35188691 PMCID: PMC9313569 DOI: 10.1002/ajh.26507] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 01/21/2022] [Accepted: 02/15/2022] [Indexed: 12/20/2022]
Abstract
Loss and/or mutation of the TP53 gene are associated with short survival in multiple myeloma, but the p53 landscape goes far beyond. At least 12 p53 protein isoforms have been identified as a result of a combination of alternative splicing, alternative promoters and/or alternative transcription site starts, which are grouped as α, β, γ, from transactivation domain (TA), long, and short isoforms. Nowadays, there are no studies evaluating the expression of p53 isoforms and its clinical relevance in multiple myeloma (MM). We used capillary nanoimmunoassay to quantify the expression of p53 protein isoforms in CD138-purified samples from 156 patients with newly diagnosed MM who were treated as part of the PETHEMA/GEM2012 clinical trial and investigated their prognostic impact. Quantitative real-time polymerase chain reaction was used to corroborate the results at RNA levels. Low and high levels of expression of short and TAp53β/γ isoforms, respectively, were associated with adverse prognosis in MM patients. Multivariate Cox models identified high levels of TAp53β/γ (hazard ratio [HR], 4.49; p < .001) and high-risk cytogenetics (HR, 2.69; p < .001) as independent prognostic factors associated with shorter time to progression. The current cytogenetic-risk classification was notably improved when expression levels of p53 protein isoforms were incorporated, whereby high-risk MM expressing high levels of short isoforms had significantly longer survival than high-risk patients with low levels of these isoforms. This is the first study that demonstrates the prognostic value of p53 isoforms in MM patients, providing new insights on the role of p53 protein dysregulation in MM biology.
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Affiliation(s)
- Elizabeta A. Rojas
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
| | - Luis A. Corchete
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
| | - Cristina De Ramón
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
| | - Patryk Krzeminski
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
- Department of Nanobiotechnology and Experimental Ecology, Institute of Biology Warsaw University of Life Sciences Warsaw Poland
| | - Dalia Quwaider
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
| | - Ramón García‐Sanz
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), CB16/12/00233 Salamanca Spain
- Grupo Español de Mieloma (GEM) Barcelona Spain
| | - Joaquín Martínez‐López
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), CB16/12/00233 Salamanca Spain
- Grupo Español de Mieloma (GEM) Barcelona Spain
- Medicine Department Complutense University Madrid Spain
- Spanish National Cancer Research Center (CNIO) Madrid Spain
| | - Albert Oriol
- Grupo Español de Mieloma (GEM) Barcelona Spain
- University Hospital Germans Trias i Pujol Barcelona Spain
| | - Laura Rosiñol
- Grupo Español de Mieloma (GEM) Barcelona Spain
- Hospital Clinic of Barcelona Instituto de Investigaciones Biomédicas August Pi i Sunyer (IDIBAPS) Barcelona Spain
| | - Joan Bladé
- Grupo Español de Mieloma (GEM) Barcelona Spain
- Hospital Clinic of Barcelona Instituto de Investigaciones Biomédicas August Pi i Sunyer (IDIBAPS) Barcelona Spain
| | - Juan José Lahuerta
- Grupo Español de Mieloma (GEM) Barcelona Spain
- Hematology Department University Hospital 12 de Octubre Madrid Spain
| | - Jesús F. San Miguel
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), CB16/12/00233 Salamanca Spain
- Grupo Español de Mieloma (GEM) Barcelona Spain
- Clínica Universidad de Navarra, Centro de Investigaciones Médicas Aplicadas (CIMA) Instituto de Investigación Sanitaria de Navarra (IdiSNA) Pamplona Spain
| | - Marcos González
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), CB16/12/00233 Salamanca Spain
| | - María Victoria Mateos
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), CB16/12/00233 Salamanca Spain
- Grupo Español de Mieloma (GEM) Barcelona Spain
| | | | - Irena Misiewicz‐Krzeminska
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
- Experimental Hematology Department Institute of Hematology and Transfusion Medicine Warsaw Poland
| | - Norma C. Gutiérrez
- Hematology Department University Hospital of Salamanca, IBSAL Salamanca Spain
- Cancer Research Center‐IBMCC (USAL‐CSIC) Salamanca Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), CB16/12/00233 Salamanca Spain
- Grupo Español de Mieloma (GEM) Barcelona Spain
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18
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Noncanonical roles of p53 in cancer stemness and their implications in sarcomas. Cancer Lett 2022; 525:131-145. [PMID: 34742870 DOI: 10.1016/j.canlet.2021.10.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 09/24/2021] [Accepted: 10/25/2021] [Indexed: 12/25/2022]
Abstract
Impairment of the prominent tumor suppressor p53, well known for its canonical role as the "guardian of the genome", is found in almost half of human cancers. More recently, p53 has been suggested to be a crucial regulator of stemness, orchestrating the differentiation of embryonal and adult stem cells, suppressing reprogramming into induced pluripotent stem cells, or inhibiting cancer stemness (i.e., cancer stem cells, CSCs), which underlies the development of therapy-resistant tumors. This review addresses these noncanonical roles of p53 and their implications in sarcoma initiation and progression. Indeed, dysregulation of p53 family proteins is a common event in sarcomas and is associated with poor survival. Additionally, emerging studies have demonstrated that loss of wild-type p53 activity hinders the terminal differentiation of mesenchymal stem cells and leads to the development of aggressive sarcomas. This review summarizes recent findings on the roles of aberrant p53 in sarcoma development and stemness and further describes therapeutic approaches to restore normal p53 activity as a promising anti-CSC strategy to treat refractory sarcomas.
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19
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Gong X, Tian M, Cao N, Yang P, Xu Z, Zheng S, Liao Q, Chen C, Zeng C, Jose PA, Wang DZ, Jian Z, Xiao Y, Jiang DS, Wei X, Zhang B, Wang Y, Chen K, Wu G, Zeng C. Circular RNA circEsyt2 regulates vascular smooth muscle cell remodeling via splicing regulation. J Clin Invest 2021; 131:147031. [PMID: 34907911 DOI: 10.1172/jci147031] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 10/19/2021] [Indexed: 12/27/2022] Open
Abstract
Circular RNAs (circRNAs) have been recently recognized as playing a role in the pathogenesis of vascular remodeling-related diseases by modulating the functions of miRNAs. However, the interplay between circRNAs and proteins during vascular remodeling remains poorly understood. Here, we investigated a previously identified circRNA, circEsyt2, whose expression is known to be upregulated during vascular remodeling. Loss- and gain-of‑function mutation analyses in vascular smooth muscle cells (VSMCs) revealed that circEsyt2 enhanced cell proliferation and migration and inhibited apoptosis and differentiation. Furthermore, the silencing of circEsyt2 in vivo reduced neointima formation, while circEsyt2 overexpression enhanced neointimal hyperplasia in the injured carotid artery, confirming its role in vascular remodeling. Using unbiased protein-RNA screening and molecular validation, circEsyt2 was found to directly interact with polyC-binding protein 1 (PCBP1), an RNA splicing factor, and regulate PCBP1 intracellular localization. Additionally, circEsyt2 silencing substantially enhanced p53β splicing via the PCBP1-U2AF65 interaction, leading to the altered expression of p53 target genes (cyclin D1, p21, PUMA, and NOXA) and the decreased proliferation of VSMCs. Thus, we identified a potentially novel circRNA that regulated vascular remodeling, via altered RNA splicing, in atherosclerotic mouse models.
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Affiliation(s)
- Xue Gong
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Miao Tian
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Nian Cao
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Peili Yang
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,College of Medicine, Southwest Jiaotong University, Chengdu, China.,Department of Cardiovascular Medicine, The General Hospital of Western Theater Command PLA, Chengdu, China
| | - Zaicheng Xu
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Shuo Zheng
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Qiao Liao
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Caiyu Chen
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Cindy Zeng
- Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Pedro A Jose
- Division of Renal Disease & Hypertension, Departments of Medicine and Pharmacology/Physiology, The George Washington University School of Medicine and Health Sciences, Washington, DC, USA
| | - Da-Zhi Wang
- Department of Cardiology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Zhao Jian
- Department of Cardiovascular Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Yingbin Xiao
- Department of Cardiovascular Surgery, Xinqiao Hospital, Third Military Medical University, Chongqing, China
| | - Ding-Sheng Jiang
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiang Wei
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bing Zhang
- Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yibin Wang
- Division of Molecular Medicine, Departments of Anesthesiology, Physiology and Medicine, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, California, USA
| | - Ken Chen
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China.,Cardiovascular Research Center of Chongqing College, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Chongqing, China
| | - Gengze Wu
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China
| | - Chunyu Zeng
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China.,Chongqing Key Laboratory for Hypertension Research, Chongqing Cardiovascular Clinical Research Center, Chongqing Institute of Cardiology, Chongqing, China.,Cardiovascular Research Center of Chongqing College, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Chongqing, China
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20
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Mehta S, Campbell H, Drummond CJ, Li K, Murray K, Slatter T, Bourdon JC, Braithwaite AW. Adaptive homeostasis and the p53 isoform network. EMBO Rep 2021; 22:e53085. [PMID: 34779563 PMCID: PMC8647153 DOI: 10.15252/embr.202153085] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 10/12/2021] [Accepted: 10/28/2021] [Indexed: 12/25/2022] Open
Abstract
All living organisms have developed processes to sense and address environmental changes to maintain a stable internal state (homeostasis). When activated, the p53 tumour suppressor maintains cell and organ integrity and functions in response to homeostasis disruptors (stresses) such as infection, metabolic alterations and cellular damage. Thus, p53 plays a fundamental physiological role in maintaining organismal homeostasis. The TP53 gene encodes a network of proteins (p53 isoforms) with similar and distinct biochemical functions. The p53 network carries out multiple biological activities enabling cooperation between individual cells required for long‐term survival of multicellular organisms (animals) in response to an ever‐changing environment caused by mutation, infection, metabolic alteration or damage. In this review, we suggest that the p53 network has evolved as an adaptive response to pathogen infections and other environmental selection pressures.
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Affiliation(s)
- Sunali Mehta
- Department of Pathology, School of Medicine, University of Otago, Dunedin, New Zealand.,Maurice Wilkins Centre for Biodiscovery, University of Otago, Dunedin, New Zealand
| | - Hamish Campbell
- Department of Pathology, School of Medicine, University of Otago, Dunedin, New Zealand
| | - Catherine J Drummond
- Department of Pathology, School of Medicine, University of Otago, Dunedin, New Zealand.,Maurice Wilkins Centre for Biodiscovery, University of Otago, Dunedin, New Zealand
| | - Kunyu Li
- Department of Pathology, School of Medicine, University of Otago, Dunedin, New Zealand
| | - Kaisha Murray
- Dundee Cancer Centre, Ninewells Hospital and Medical School, University of Dundee, Dundee, UK
| | - Tania Slatter
- Department of Pathology, School of Medicine, University of Otago, Dunedin, New Zealand.,Maurice Wilkins Centre for Biodiscovery, University of Otago, Dunedin, New Zealand
| | - Jean-Christophe Bourdon
- Dundee Cancer Centre, Ninewells Hospital and Medical School, University of Dundee, Dundee, UK
| | - Antony W Braithwaite
- Department of Pathology, School of Medicine, University of Otago, Dunedin, New Zealand.,Maurice Wilkins Centre for Biodiscovery, University of Otago, Dunedin, New Zealand
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21
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Gudikote JP, Cascone T, Poteete A, Sitthideatphaiboon P, Wu Q, Morikawa N, Zhang F, Peng S, Tong P, Li L, Shen L, Nilsson M, Jones P, Sulman EP, Wang J, Bourdon JC, Johnson FM, Heymach JV. Inhibition of nonsense-mediated decay rescues p53β/γ isoform expression and activates the p53 pathway in MDM2-overexpressing and select p53-mutant cancers. J Biol Chem 2021; 297:101163. [PMID: 34481841 PMCID: PMC8569473 DOI: 10.1016/j.jbc.2021.101163] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 08/16/2021] [Accepted: 09/01/2021] [Indexed: 12/13/2022] Open
Abstract
Inactivation of p53 is present in almost every tumor, and hence, p53-reactivation strategies are an important aspect of cancer therapy. Common mechanisms for p53 loss in cancer include expression of p53-negative regulators such as MDM2, which mediate the degradation of wildtype p53 (p53α), and inactivating mutations in the TP53 gene. Currently, approaches to overcome p53 deficiency in these cancers are limited. Here, using non–small cell lung cancer and glioblastoma multiforme cell line models, we show that two alternatively spliced, functional truncated isoforms of p53 (p53β and p53γ, comprising exons 1 to 9β or 9γ, respectively) and that lack the C-terminal MDM2-binding domain have markedly reduced susceptibility to MDM2-mediated degradation but are highly susceptible to nonsense-mediated decay (NMD), a regulator of aberrant mRNA stability. In cancer cells harboring MDM2 overexpression or TP53 mutations downstream of exon 9, NMD inhibition markedly upregulates p53β and p53γ and restores activation of the p53 pathway. Consistent with p53 pathway activation, NMD inhibition induces tumor suppressive activities such as apoptosis, reduced cell viability, and enhanced tumor radiosensitivity, in a relatively p53-dependent manner. In addition, NMD inhibition also inhibits tumor growth in a MDM2-overexpressing xenograft tumor model. These results identify NMD inhibition as a novel therapeutic strategy for restoration of p53 function in p53-deficient tumors bearing MDM2 overexpression or p53 mutations downstream of exon 9, subgroups that comprise approximately 6% of all cancers.
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Affiliation(s)
- Jayanthi P Gudikote
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Tina Cascone
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Alissa Poteete
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Piyada Sitthideatphaiboon
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Qiuyu Wu
- Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Naoto Morikawa
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Fahao Zhang
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Shaohua Peng
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Pan Tong
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Lerong Li
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Li Shen
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Monique Nilsson
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Phillip Jones
- Institute for Applied Cancer Science, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Erik P Sulman
- Department of Radiation Oncology and Brain and Spine Tumor Center, Laura and Isaac Perlmutter Cancer Center, NYU Langone School of Medicine, New York, New York, USA
| | - Jing Wang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA; The University of Texas MD Anderson Cancer Center Graduate School of Biomedical Sciences, Houston, Texas, USA
| | - Jean-Christophe Bourdon
- Cellular Division, Ninewells Hospital Campus, School of Medicine, University of Dundee, Dundee, UK
| | - Faye M Johnson
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA; The University of Texas MD Anderson Cancer Center Graduate School of Biomedical Sciences, Houston, Texas, USA
| | - John V Heymach
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
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22
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The balance between p53 isoforms modulates the efficiency of HIV-1 infection in macrophages. J Virol 2021; 95:e0118821. [PMID: 34379507 DOI: 10.1128/jvi.01188-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Several host factors influence HIV-1 infection and replication. The p53-mediated antiviral role in monocytes-derived macrophages (MDMs) was previously highlighted. Indeed, an increase in p53 level results in a stronger restriction against HIV-1 early replication steps through SAMHD1 activity. In this study, we investigated the potential role of some p53 isoforms in HIV-1 infection. Transfection of isoform-specific siRNA induces distinctive effects on the virus life cycle. For example, in contrast to a siRNA targeting all isoforms, a knockdown of Δ133p53 transcripts reduces virus replication in MDMs that is correlated with a decrease in phosphorylated inactive SAMHD1. Combination of Δ133p53 knockdown and Nutlin-3, a pharmacological inhibitor of MDM2 that stabilizes p53, further reduces susceptibility of MDMs to HIV-1 infection, thus suggesting an inhibitory role of Δ133p53 towards p53 antiviral activity. In contrast, p53β knockdown in MDMs increases the viral production independently of SAMHD1. Moreover, experiments with a Nef-deficient virus show that this viral protein plays a protective role against the antiviral environment mediated by p53. Finally, HIV-1 infection affects the expression pattern of p53 isoforms by increasing p53β and p53γ mRNA levels while stabilizing the protein level of p53α and some isoforms from the p53β subclass. The balance between the various p53 isoforms is therefore an important factor in the overall susceptibility of macrophages to HIV-1 infection, fine-tuning the p53 response against HIV-1. This study brings a new understanding of the complex role of p53 in virus replication processes in myeloid cells. Importance As of today, HIV-1 is still considered as a global pandemic without a functional cure, partly because of the presence of stable viral reservoirs. Macrophages constitute one of these cell reservoirs, contributing to the viral persistence. Studies investigating the host factors involved in cell susceptibility to HIV-1 infection might lead to a better understanding of the reservoir formation and will eventually allow the development of an efficient cure. Our team previously showed the antiviral role of p53 in macrophages, which acts by compromising the early steps of HIV-1 replication. In this study, we demonstrate the involvement of p53 isoforms, which regulates p53 activity and define the cellular environment influencing viral replication. In addition, the results concerning the potential role of p53 in antiviral innate immunity could be transposed to other fields of virology and suggest that knowledge in oncology can be applied to HIV-1 research.
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23
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Wan H, Yang Y, Li Z, Cheng L, Ding Z, Wan H, Yang J, Zhou H. Compatibility of ingredients of Danshen (Radix Salviae Miltiorrhizae) and Honghua ( Flos Carthami) and their protective effects on cerebral ischemia-reperfusion injury in rats. Exp Ther Med 2021; 22:849. [PMID: 34149895 PMCID: PMC8210257 DOI: 10.3892/etm.2021.10281] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 04/23/2021] [Indexed: 12/17/2022] Open
Abstract
Danshen (Radix Salviae Miltiorrhizae) and Honghua (Flos Carthami) (Danhong) are two drugs commonly prescribed together, which are often used in the treatment of cerebrovascular diseases in China. Due to the complexity of the ingredients of Danhong, the present study focused on performing the orthogonal compatibility method on the primary effective molecules of this drug: Tanshinol, salvianolic acid A, salvianolic acid B and hydroxysafflor yellow A. These four molecules were studied to determine their protective effects and to screen for the most compatible ingredients to improve cerebral ischemia-reperfusion injury (IR) in rats. Focal middle cerebral artery occlusion was performed to establish the cerebral IR model in rats. Male Sprague-Dawley rats were randomly divided into sham operation group, IR group and nine orthogonal administration groups with different ratios of Danhong effective ingredients and Danhong injection group. Neurological deficit score and cerebral infarction volume were measured postoperatively. Morphological pathological alterations were observed via H&E staining. Bcl-2 and Bax were quantified using ELISA. Immunohistochemistry was conducted to analyze the expression of caspase-3 in the hippocampus. The expression levels of cytochrome c, apoptotic peptidase activating factor 1 (apaf-1), caspase-9, caspase-3 and p53 mRNA in the hippocampus were assessed via reverse transcription-quantitative PCR. The results demonstrated that different compatibility groups significantly reduced the neurological function score and decreased the volume of cerebral infarct compared with the IR group. These groups were also indicated to improve the pathological damage to the brain tissue. In addition, certain compatibility groups significantly decreased the number of caspase-3 positive cells in the hippocampus and the expression levels of cytochrome c, apaf-1, caspase-9, caspase-3 and p53 mRNA in the brain tissue. Orthogonal group 4 (30 mg/kg tanshinol; 2.5 mg/kg salvianolic acid A; 16 mg/kg salvianolic acid B; 8 mg/kg hydroxysafflor yellow A) was indicated to be the most effective. The four effective ingredients of Danhong exhibited a protective effect on rats with cerebral IR injury, potentially through the inhibition of apoptosis via the downregulation of key targets upstream of the caspase-3 pathway. In addition, the present study provided novel insights for the continued study of the drug compatibility rules of TCM.
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Affiliation(s)
- Haoyu Wan
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
| | - Yuting Yang
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
| | - Zhiwei Li
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
| | - Lan Cheng
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
| | - Zhishan Ding
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
| | - Haitong Wan
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
| | - Jiehong Yang
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
| | - Huifen Zhou
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China
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24
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p53/p73 Protein Network in Colorectal Cancer and Other Human Malignancies. Cancers (Basel) 2021; 13:cancers13122885. [PMID: 34207603 PMCID: PMC8227208 DOI: 10.3390/cancers13122885] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/02/2021] [Accepted: 06/03/2021] [Indexed: 12/16/2022] Open
Abstract
Simple Summary The p53 family of proteins comprises p53, p63, and p73, which share high structural and functional similarity. The two distinct promoters of each locus, the alternative splicing, and the alternative translation initiation sites enable the generation of numerous isoforms with different protein-interacting domains and distinct activities. The co-expressed p53/p73 isoforms have significant but distinct roles in carcinogenesis. Their activity is frequently impaired in human tumors including colorectal carcinoma due to dysregulated expression and a dominant-negative effect accomplished by some isoforms and p53 mutants. The interactions between isoforms are particularly important to understand the onset of tumor formation, progression, and therapeutic response. The understanding of the p53/p73 network can contribute to the development of new targeted therapies. Abstract The p53 tumor suppressor protein is crucial for cell growth control and the maintenance of genomic stability. Later discovered, p63 and p73 share structural and functional similarity with p53. To understand the p53 pathways more profoundly, all family members should be considered. Each family member possesses two promoters and alternative translation initiation sites, and they undergo alternative splicing, generating multiple isoforms. The resulting isoforms have important roles in carcinogenesis, while their expression is dysregulated in several human tumors including colorectal carcinoma, which makes them potential targets in cancer treatment. Their activities arise, at least in part, from the ability to form tetramers that bind to specific DNA sequences and activate the transcription of target genes. In this review, we summarize the current understanding of the biological activities and regulation of the p53/p73 isoforms, highlighting their role in colorectal tumorigenesis. The analysis of the expression patterns of the p53/p73 isoforms in human cancers provides an important step in the improvement of cancer therapy. Furthermore, the interactions among the p53 family members which could modulate normal functions of the canonical p53 in tumor tissue are described. Lastly, we emphasize the importance of clinical studies to assess the significance of combining the deregulation of different members of the p53 family to define the outcome of the disease.
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25
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Tong DR, Zhou W, Katz C, Regunath K, Venkatesh D, Ihuegbu C, Manfredi JJ, Laptenko O, Prives C. p53 Frameshift Mutations Couple Loss-of-Function with Unique Neomorphic Activities. Mol Cancer Res 2021; 19:1522-1533. [PMID: 34045312 DOI: 10.1158/1541-7786.mcr-20-0691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 03/17/2021] [Accepted: 05/10/2021] [Indexed: 11/16/2022]
Abstract
p53 mutations that result in loss of transcriptional activity are commonly found in numerous types of cancer. While the majority of these are missense mutations that map within the central DNA-binding domain, truncations and/or frameshift mutations can also occur due to various nucleotide substitutions, insertions, or deletions. These changes result in mRNAs containing premature stop codons that are translated into a diverse group of C-terminally truncated proteins. Here we characterized three p53 frameshift mutant proteins expressed from the endogenous TP53 locus in U2OS osteosarcoma and HCT116 colorectal cancer cell lines. These mutants retain intact DNA-binding domains but display altered oligomerization properties. Despite their abnormally high expression levels, they are mostly transcriptionally inactive and unable to initiate a stimuli-induced transcriptional program characteristic of wild-type p53. However, one of these variant p53 proteins, I332fs*14, which resembles naturally expressed TAp53 isoforms β and γ, retains some residual antiproliferative activity and can induce cellular senescence in HCT116 cells. Cells expressing this mutant also display decreased motility in migration assays. Hence, this p53 variant exhibits a combination of loss-of-gain and gain-of-function characteristics, distinguishing it from both wild type p53 and p53 loss. IMPLICATIONS: p53 frameshift mutants display a mixture of residual antiproliferative and neomorphic functions that may be differentially exploited for targeted therapy.
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Affiliation(s)
- David R Tong
- Department of Biological Sciences, Columbia University, New York, New York
| | - Wen Zhou
- Department of Biological Sciences, Columbia University, New York, New York
| | - Chen Katz
- Department of Biological Sciences, Columbia University, New York, New York
| | - Kausik Regunath
- Department of Biological Sciences, Columbia University, New York, New York
| | - Divya Venkatesh
- Department of Biological Sciences, Columbia University, New York, New York
| | - Chinyere Ihuegbu
- Department of Biological Sciences, Columbia University, New York, New York
| | - James J Manfredi
- Department of Oncological Sciences, Tisch Cancer Institute, Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Oleg Laptenko
- Department of Biological Sciences, Columbia University, New York, New York.
| | - Carol Prives
- Department of Biological Sciences, Columbia University, New York, New York.
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26
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p53 Protein Isoform Profiles in AML: Correlation with Distinct Differentiation Stages and Response to Epigenetic Differentiation Therapy. Cells 2021; 10:cells10040833. [PMID: 33917201 PMCID: PMC8068061 DOI: 10.3390/cells10040833] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/30/2021] [Accepted: 04/03/2021] [Indexed: 11/17/2022] Open
Abstract
p53 protein isoform expression has been found to correlate with prognosis and chemotherapy response in acute myeloid leukemia (AML). We aimed to investigate how p53 protein isoforms are modulated during epigenetic differentiation therapy in AML, and if p53 isoform expression could be a potential biomarker for predicting a response to this treatment. p53 full-length (FL), p53β and p53γ protein isoforms were analyzed by 1D and 2D gel immunoblots in AML cell lines, primary AML cells from untreated patients and AML cells from patients before and after treatment with valproic acid (VPA), all-trans retinoic acid (ATRA) and theophylline. Furthermore, global gene expression profiling analysis was performed on samples from the clinical protocol. Correlation analyses were performed between p53 protein isoform expression and in vitro VPA sensitivity and FAB (French–American–British) class in primary AML cells. The results show downregulation of p53β/γ and upregulation of p53FL in AML cell lines treated with VPA, and in some of the patients treated with differentiation therapy. p53FL positively correlated with in vitro VPA sensitivity and the FAB class of AML, while p53β/γ isoforms negatively correlated with the same. Our results indicate that p53 protein isoforms are modulated by and may predict sensitivity to differentiation therapy in AML.
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27
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Chen J, Zhang D, Qin X, Owzar K, McCann JJ, Kastan MB. DNA-Damage-Induced Alternative Splicing of p53. Cancers (Basel) 2021; 13:E251. [PMID: 33445417 PMCID: PMC7827558 DOI: 10.3390/cancers13020251] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 11/25/2020] [Accepted: 01/04/2021] [Indexed: 11/18/2022] Open
Abstract
Cellular responses to DNA damage and other stresses are important determinants of mutagenesis and impact the development of a wide range of human diseases. TP53 is highly mutated in human cancers and plays an essential role in stress responses and cell fate determination. A central dogma of p53 induction after DNA damage has been that the induction results from a transient increase in the half-life of the p53 protein. Our laboratory recently demonstrated that this long-standing paradigm is an incomplete picture of p53 regulation by uncovering a critical role for protein translational regulation in p53 induction after DNA damage. These investigations led to the discovery of a DNA-damage-induced alternative splicing (AS) pathway that affects p53 and other gene products. The damage-induced AS of p53 pre-mRNA generates the beta isoform of p53 (p53β) RNA and protein, which is specifically required for the induction of cellular senescence markers after ionizing irradiation (IR). In an attempt to elucidate the mechanisms behind the differential regulation and apparent functional divergence between full-length (FL) p53 and the p53β isoform (apoptosis versus senescence, respectively), we identified the differential transcriptome and protein interactome between these two proteins that may result from the unique 10-amino-acid tail in p53β protein.
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Affiliation(s)
- Jing Chen
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA; (J.C.); (J.J.M.)
- Current Address-Crown Bioscience, Inc., San Diego, CA 92127, USA
| | - Dadong Zhang
- Duke Cancer Institute, Durham, NC 27710, USA; (D.Z.); (X.Q.); (K.O.)
| | - Xiaodi Qin
- Duke Cancer Institute, Durham, NC 27710, USA; (D.Z.); (X.Q.); (K.O.)
| | - Kouros Owzar
- Duke Cancer Institute, Durham, NC 27710, USA; (D.Z.); (X.Q.); (K.O.)
- Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC 27710, USA
| | - Jennifer J. McCann
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA; (J.C.); (J.J.M.)
| | - Michael B. Kastan
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC 27710, USA; (J.C.); (J.J.M.)
- Duke Cancer Institute, Durham, NC 27710, USA; (D.Z.); (X.Q.); (K.O.)
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28
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Hajj GNM, Nunes PBC, Roffe M. Genome-wide translation patterns in gliomas: An integrative view. Cell Signal 2020; 79:109883. [PMID: 33321181 DOI: 10.1016/j.cellsig.2020.109883] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 12/01/2020] [Accepted: 12/11/2020] [Indexed: 02/06/2023]
Abstract
Gliomas are the most frequent tumors of the central nervous system (CNS) and include the highly malignant glioblastoma (GBM). Characteristically, gliomas have translational control deregulation related to overactivation of signaling pathways such as PI3K/AKT/mTORC1 and Ras/ERK1/2. Thus, mRNA translation appears to play a dominant role in glioma gene expression patterns. The, analysis of genome-wide translated transcripts, together known as the translatome, may reveal important information for understanding gene expression patterns in gliomas. This review provides a brief overview of translational control mechanisms altered in gliomas with a focus on the current knowledge related to the translatomes of glioma cells and murine glioma models. We present an integrative meta-analysis of selected glioma translatome data with the aim of identifying recurrent patterns of gene expression preferentially regulated at the level of translation and obtaining clues regarding the pathological significance of these alterations. Re-analysis of several translatome datasets was performed to compare the translatomes of glioma models with those of their non-tumor counterparts and to document glioma cell responses to radiotherapy and MNK modulation. The role of recurrently altered genes in the context of translational control and tumorigenesis are discussed.
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Affiliation(s)
- Glaucia Noeli Maroso Hajj
- International Research Institute, A.C.Camargo Cancer Center, Rua Taguá, 440, São Paulo ZIP Code: 01508-010, Brazil; National Institute of Oncogenomics and Innovation, Brazil.
| | - Paula Borzino Cordeiro Nunes
- International Research Institute, A.C.Camargo Cancer Center, Rua Taguá, 440, São Paulo ZIP Code: 01508-010, Brazil
| | - Martin Roffe
- International Research Institute, A.C.Camargo Cancer Center, Rua Taguá, 440, São Paulo ZIP Code: 01508-010, Brazil; National Institute of Oncogenomics and Innovation, Brazil.
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29
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The Δ133p53 Isoforms, Tuners of the p53 Pathway. Cancers (Basel) 2020; 12:cancers12113422. [PMID: 33218139 PMCID: PMC7698932 DOI: 10.3390/cancers12113422] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 11/12/2020] [Accepted: 11/16/2020] [Indexed: 02/07/2023] Open
Abstract
Simple Summary TP53, the most frequently mutated gene in human cancers, has a key role in the maintenance of the genetic stability and, thus, in preventing tumor development. The p53-dependent responses were long thought to be solely driven by canonical p53α. However, it is now known that TP53 physiologically expresses at least 12 p53 isoforms including Δ133p53α, Δ133p53β and Δ133p53γ. The Δ133p53 isoforms are potent modulators of the p53 pathway that regulate critical functions in cancer, physiological and premature aging, neurodegenerative diseases, immunity and inflammation, and tissue repair. This review aims to summarize the current knowledge on the Δ133p53 isoforms and how they contribute to multiple physiological and pathological mechanisms. Critically, further characterization of p53 isoforms may identify novel regulatory modes of p53 pathway functions that contribute to disease progression and facilitate the development of new therapeutic strategies. Abstract The TP53 gene is a critical tumor suppressor and key determinant of cell fate which regulates numerous cellular functions including DNA repair, cell cycle arrest, cellular senescence, apoptosis, autophagy and metabolism. In the last 15 years, the p53 pathway has grown in complexity through the discovery that TP53 differentially expresses twelve p53 protein isoforms in human cells with both overlapping and unique biologic activities. Here, we summarize the current knowledge on the Δ133p53 isoforms (Δ133p53α, Δ133p53β and Δ133p53γ), which are evolutionary derived and found only in human and higher order primates. All three isoforms lack both of the transactivation domains and the beginning of the DNA-binding domain. Despite the absence of these canonical domains, the Δ133p53 isoforms maintain critical functions in cancer, physiological and premature aging, neurodegenerative diseases, immunity and inflammation, and tissue repair. The ability of the Δ133p53 isoforms to modulate the p53 pathway functions underscores the need to include these p53 isoforms in our understanding of how the p53 pathway contributes to multiple physiological and pathological mechanisms. Critically, further characterization of p53 isoforms may identify novel regulatory modes of p53 pathway functions that contribute to disease progression and facilitate the development of new therapeutic strategies.
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30
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Li X, Lei Y, Yu Y, Zhang Y, Zhang W, Shen H, Tao C, Wu F, Huang S, Shao H. Discovery and characterization of a novel splice variant of the p53 tumor suppressor gene in a human T cell leukemia cellline. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2020; 13:1121-1135. [PMID: 32509087 PMCID: PMC7270667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 04/14/2020] [Indexed: 06/11/2023]
Abstract
Alternative splicing produces multiple mRNA variants of TP53 which have diverse biologic functions. In this study, we identified a novel splice variant of TP53 lacking a 200 nt portion of exon 4 (p53ΔE4p) from a human leukemia T cell line. No protein product of p53ΔE4p was identifiable by western blot; however, forced expression of the variant in HEK-293T cells expressing wild-type p53 could inhibit cell proliferation and promote cell death. Interestingly, this novel variant also significantly enhances the expression of reporter genes. Moreover, transcriptome analysis showed that genes related to DNA binding and regulation of transcription by RNA polymerase II function were significantly upregulated following p53ΔE4p transfection, suggesting a role for this variant in the regulation of gene expression.
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Affiliation(s)
- Xiaomei Li
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Yingshou Lei
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Yang Yu
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Yaqian Zhang
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Wenfeng Zhang
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Han Shen
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Changli Tao
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Fenglin Wu
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
| | - Shulin Huang
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
- Central Laboratory, Affiliated Dongguan People’s Hospital, Southern Medical UniversityDongguan, Guangdong Province, China
| | - Hongwei Shao
- School of Life Science and Biopharmaceutics, Guangdong Pharmaceutical UniversityGuangzhou, Guangdong Province, China
- Guangdong Province Key Laboratory for Biotechnology Drug CandidateGuangzhou, Guangdong Province, China
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31
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McDermott JE, Arshad OA, Petyuk VA, Fu Y, Gritsenko MA, Clauss TR, Moore RJ, Schepmoes AA, Zhao R, Monroe ME, Schnaubelt M, Tsai CF, Payne SH, Huang C, Wang LB, Foltz S, Wyczalkowski M, Wu Y, Song E, Brewer MA, Thiagarajan M, Kinsinger CR, Robles AI, Boja ES, Rodriguez H, Chan DW, Zhang B, Zhang Z, Ding L, Smith RD, Liu T, Rodland KD. Proteogenomic Characterization of Ovarian HGSC Implicates Mitotic Kinases, Replication Stress in Observed Chromosomal Instability. CELL REPORTS MEDICINE 2020; 1. [PMID: 32529193 PMCID: PMC7289043 DOI: 10.1016/j.xcrm.2020.100004] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In the absence of a dominant driving mutation other than uniformly present TP53 mutations, deeper understanding of the biology driving ovarian high-grade serous cancer (HGSC) requires analysis at a functional level, including post-translational modifications. Comprehensive proteogenomic and phosphoproteomic characterization of 83 prospectively collected ovarian HGSC and appropriate normal precursor tissue samples (fallopian tube) under strict control of ischemia time reveals pathways that significantly differentiate between HGSC and relevant normal tissues in the context of homologous repair deficiency (HRD) status. In addition to confirming key features of HGSC from previous studies, including a potential survival-associated signature and histone acetylation as a marker of HRD, deep phosphoproteomics provides insights regarding the potential role of proliferation-induced replication stress in promoting the characteristic chromosomal instability of HGSC and suggests potential therapeutic targets for use in precision medicine trials. Comparison of ovarian cancer and normal precursors identifies key signaling pathways Mitotic and cyclin-dependent kinases emerge as potential therapeutic targets Previously identified hallmarks of homologous repair status and survival are confirmed Replication stress appears to drive increased chromosomal instability
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Affiliation(s)
- Jason E McDermott
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA.,Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, OR 97201, USA.,These authors contributed equally
| | - Osama A Arshad
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA.,These authors contributed equally
| | - Vladislav A Petyuk
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Yi Fu
- Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA
| | - Marina A Gritsenko
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Therese R Clauss
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Ronald J Moore
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Athena A Schepmoes
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Rui Zhao
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Matthew E Monroe
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Michael Schnaubelt
- Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA
| | - Chia-Feng Tsai
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Samuel H Payne
- Department of Biology, Brigham Young University, Provo, UT 84602, USA
| | - Chen Huang
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX 77030, USA.,Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Liang-Bo Wang
- The McDonnell Genome Institute, Washington University in St. Louis, St Louis, MO 63108, USA
| | - Steven Foltz
- The McDonnell Genome Institute, Washington University in St. Louis, St Louis, MO 63108, USA
| | - Matthew Wyczalkowski
- The McDonnell Genome Institute, Washington University in St. Louis, St Louis, MO 63108, USA
| | - Yige Wu
- The McDonnell Genome Institute, Washington University in St. Louis, St Louis, MO 63108, USA
| | - Ehwang Song
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Molly A Brewer
- Department of Obstetrics and Gynecology, University of Connecticut, Farmington, CT 06030, USA
| | - Mathangi Thiagarajan
- Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Christopher R Kinsinger
- Office of Cancer Clinical Proteomics Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Ana I Robles
- Office of Cancer Clinical Proteomics Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Emily S Boja
- Office of Cancer Clinical Proteomics Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Henry Rodriguez
- Office of Cancer Clinical Proteomics Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Daniel W Chan
- Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA
| | - Bing Zhang
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX 77030, USA.,Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Zhen Zhang
- Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA
| | - Li Ding
- The McDonnell Genome Institute, Washington University in St. Louis, St Louis, MO 63108, USA
| | - Richard D Smith
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Tao Liu
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Karin D Rodland
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA.,Department of Cell, Developmental, and Cancer Biology, Oregon Health & Science University, Portland, OR 97201, USA.,Lead Contact
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32
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Sciarrillo R, Wojtuszkiewicz A, Kooi IE, Leon LG, Sonneveld E, Kuiper RP, Jansen G, Giovannetti E, Kaspers GJ, Cloos J. Glucocorticoid Resistant Pediatric Acute Lymphoblastic Leukemia Samples Display Altered Splicing Profile and Vulnerability to Spliceosome Modulation. Cancers (Basel) 2020; 12:cancers12030723. [PMID: 32204435 PMCID: PMC7140081 DOI: 10.3390/cancers12030723] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/14/2020] [Accepted: 03/16/2020] [Indexed: 12/01/2022] Open
Abstract
Glucocorticoid (GC) resistance is a crucial determinant of inferior response to chemotherapy in pediatric acute lymphoblastic leukemia (ALL); however, molecular mechanisms underlying this phenomenon are poorly understood. Deregulated splicing is a common feature of many cancers, which impacts drug response and constitutes an attractive therapeutic target. Therefore, the aim of the current study was to characterize global splicing profiles associated with GC resistance and determine whether splicing modulation could serve as a novel therapeutic option for GC-resistant patients. To this end, 38 primary ALL samples were profiled using RNA-seq-based differential splicing analysis. The impact of splicing modulators was investigated in GC-resistant leukemia cell lines and primary leukemic specimens. Our findings revealed, for the first time, markedly distinct splicing landscapes in ALL samples of B-cell precursor (BCP)-ALL and T-ALL lineages. Differential splicing events associated with GC resistance were involved in RNA processing, a direct response to GCs, survival signaling, apoptosis, cell cycle regulation and energy metabolism. Furthermore, our analyses showed that GC-resistant ALL cell lines and primary samples are sensitive to splicing modulation, alone and in combination with GC. Together, these findings suggest that aberrant splicing is associated with GC resistance and splicing modulators deserve further interest as a novel treatment option for GC-resistant patients.
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Affiliation(s)
- Rocco Sciarrillo
- Amsterdam UMC, Vrije Universiteit Amsterdam, Departments of Pediatric Oncology, Hematology and Medical Oncology, Cancer Center Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Anna Wojtuszkiewicz
- Amsterdam UMC, Vrije Universiteit Amsterdam, Departments of Pediatric Oncology and Hematology, Cancer Center Amsterdam, 1081 HV Amsterdam, The Netherlands
- Correspondence:
| | - Irsan E. Kooi
- Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Center Amsterdam, Department of Clinical Genetics, 1081 HV Amsterdam, The Netherlands
| | - Leticia G. Leon
- Erasmus MC, University Medical Center Rotterdam, Department of Immunology, 3000 CA Rotterdam, The Netherlands
| | - Edwin Sonneveld
- Princess Máxima Center for Pediatric Oncology, 3584 CX Utrecht, The Netherlands
| | - Roland P. Kuiper
- Princess Máxima Center for Pediatric Oncology, 3584 CX Utrecht, The Netherlands
| | - Gerrit Jansen
- Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Immunology and Rheumatology Center, Cancer Center Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Elisa Giovannetti
- Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Medical Oncology, Cancer Center Amsterdam, 1081 HV Amsterdam, The Netherlands
- Cancer Pharmacology Lab, AIRC Start-Up Unit, Fondazione Pisana per la Scienza, 56017 San Giuliano Terme (Pisa), Italy
| | - Gertjan J.L. Kaspers
- Princess Máxima Center for Pediatric Oncology, 3584 CX Utrecht, The Netherlands
- Emma’s Children’s Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam, Pediatric Oncology, 1081 HV Amsterdam, The Netherlands
| | - Jacqueline Cloos
- Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Hematology, Cancer Center Amsterdam, 1081 HV Amsterdam, The Netherlands
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33
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Roles of Splicing Factors in Hormone-Related Cancer Progression. Int J Mol Sci 2020; 21:ijms21051551. [PMID: 32106418 PMCID: PMC7084890 DOI: 10.3390/ijms21051551] [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: 02/08/2020] [Accepted: 02/20/2020] [Indexed: 12/19/2022] Open
Abstract
Splicing of mRNA precursor (pre-mRNA) is a mechanism to generate multiple mRNA isoforms from a single pre-mRNA, and it plays an essential role in a variety of biological phenomena and diseases such as cancers. Previous studies have demonstrated that cancer-specific splicing events are involved in various aspects of cancers such as proliferation, migration and response to hormones, suggesting that splicing-targeting therapy can be promising as a new strategy for cancer treatment. In this review, we focus on the splicing regulation by RNA-binding proteins including Drosophila behavior/human splicing (DBHS) family proteins, serine/arginine-rich (SR) proteins and heterogeneous nuclear ribonucleoproteins (hnRNPs) in hormone-related cancers, such as breast and prostate cancers.
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34
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The Emerging Landscape of p53 Isoforms in Physiology, Cancer and Degenerative Diseases. Int J Mol Sci 2019; 20:ijms20246257. [PMID: 31835844 PMCID: PMC6941119 DOI: 10.3390/ijms20246257] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/26/2019] [Accepted: 12/09/2019] [Indexed: 12/13/2022] Open
Abstract
p53, first described four decades ago, is now established as a master regulator of cellular stress response, the “guardian of the genome”. p53 contributes to biological robustness by behaving in a cellular-context dependent manner, influenced by several factors (e.g., cell type, active signalling pathways, the type, extent and intensity of cellular damage, cell cycle stage, nutrient availability, immune function). The p53 isoforms regulate gene transcription and protein expression in response to the stimuli so that the cell response is precisely tuned to the cell signals and cell context. Twelve isoforms of p53 have been described in humans. In this review, we explore the interactions between p53 isoforms and other proteins contributing to their established cellular functions, which can be both tumour-suppressive and oncogenic in nature. Evidence of p53 isoform in human cancers is largely based on RT-qPCR expression studies, usually investigating a particular type of isoform. Beyond p53 isoform functions in cancer, it is implicated in neurodegeneration, embryological development, progeroid phenotype, inflammatory pathology, infections and tissue regeneration, which are described in this review.
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35
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Tiek DM, Khatib SA, Trepicchio CJ, Heckler MM, Divekar SD, Sarkaria JN, Glasgow E, Riggins RB. Estrogen-related receptor β activation and isoform shifting by cdc2-like kinase inhibition restricts migration and intracranial tumor growth in glioblastoma. FASEB J 2019; 33:13476-13491. [PMID: 31570001 PMCID: PMC6894094 DOI: 10.1096/fj.201901075r] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 08/26/2019] [Indexed: 11/11/2022]
Abstract
Glioblastoma (GBM; grade 4 glioma) is a highly aggressive and incurable tumor. GBM has recently been characterized as highly dependent on alternative splicing, a critical driver of tumor heterogeneity and plasticity. Estrogen-related receptor β (ERR-β) is an orphan nuclear receptor expressed in the brain, where alternative splicing of the 3' end of the pre-mRNA leads to the production of 3 validated ERR-β protein products: ERR-β short form (ERR-βsf), ERR-β2, and ERR-β exon 10 deleted. Our prior studies have shown the ERR-β2 isoform to play a role in G2/M cell cycle arrest and induction of apoptosis, in contrast to the function of the shorter ERR-βsf isoform in senescence and G1 cell cycle arrest. In this study, we sought to better define the role of the proapoptotic ERR-β2 isoform in GBM. We show that the ERR-β2 isoform is located not only in the nucleus but also in the cytoplasm. ERR-β2 suppresses GBM cell migration and interacts with the actin nucleation-promoting factor cortactin, and an ERR-β agonist is able to remodel the actin cytoskeleton and similarly suppress GBM cell migration. We further show that inhibition of the splicing regulatory cdc2-like kinases in combination with an ERR-β agonist shifts isoform expression in favor of ERR-β2 and potentiates inhibition of growth and migration in GBM cells and intracranial tumors.-Tiek, D. M., Khatib, S. A., Trepicchio, C. J., Heckler, M. M., Divekar, S. D., Sarkaria, J. N., Glasgow, E., Riggins, R. B. Estrogen-related receptor β activation and isoform shifting by cdc2-like kinase inhibition restricts migration and intracranial tumor growth in glioblastoma.
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Affiliation(s)
- Deanna M. Tiek
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | - Subreen A. Khatib
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
- Laboratory of Human Carcinogenesis, National Cancer Institute, Bethesda, Maryland, USA; and
| | - Colin J. Trepicchio
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | - Mary M. Heckler
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | - Shailaja D. Divekar
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | - Jann N. Sarkaria
- Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota, USA
| | - Eric Glasgow
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | - Rebecca B. Riggins
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
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36
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Rahhal R, Seto E. Emerging roles of histone modifications and HDACs in RNA splicing. Nucleic Acids Res 2019; 47:4911-4926. [PMID: 31162605 PMCID: PMC6547430 DOI: 10.1093/nar/gkz292] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 12/13/2022] Open
Abstract
Histone modifications and RNA splicing, two seemingly unrelated gene regulatory processes, greatly increase proteome diversity and profoundly influence normal as well as pathological eukaryotic cellular functions. Like many histone modifying enzymes, histone deacetylases (HDACs) play critical roles in governing cellular behaviors and are indispensable in numerous biological processes. While the association between RNA splicing and histone modifications is beginning to be recognized, a lack of knowledge exists regarding the role of HDACs in splicing. Recent studies however, reveal that HDACs interact with spliceosomal and ribonucleoprotein complexes, actively control the acetylation states of splicing-associated histone marks and splicing factors, and thereby unexpectedly could modulate splicing. Here, we review the role of histone/protein modifications and HDACs in RNA splicing and discuss the convergence of two parallel fields, which supports the argument that HDACs, and perhaps most histone modifying enzymes, are much more versatile and far more complicated than their initially proposed functions. Analogously, an HDAC-RNA splicing connection suggests that splicing is regulated by additional upstream factors and pathways yet to be defined or not fully characterized. Some human diseases share common underlying causes of aberrant HDACs and dysregulated RNA splicing and, thus, further support the potential link between HDACs and RNA splicing.
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Affiliation(s)
- Raneen Rahhal
- George Washington Cancer Center, Department of Biochemistry & Molecular Medicine, George Washington University School of Medicine & Health Sciences, Washington, DC 20037, USA
| | - Edward Seto
- George Washington Cancer Center, Department of Biochemistry & Molecular Medicine, George Washington University School of Medicine & Health Sciences, Washington, DC 20037, USA
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37
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Black KL, Naqvi AS, Asnani M, Hayer KE, Yang SY, Gillespie E, Bagashev A, Pillai V, Tasian SK, Gazzara MR, Carroll M, Taylor D, Lynch KW, Barash Y, Thomas-Tikhonenko A. Aberrant splicing in B-cell acute lymphoblastic leukemia. Nucleic Acids Res 2019; 46:11357-11369. [PMID: 30357359 PMCID: PMC6277088 DOI: 10.1093/nar/gky946] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 10/04/2018] [Indexed: 12/14/2022] Open
Abstract
Aberrant splicing is a hallmark of leukemias with mutations in splicing factor (SF)-encoding genes. Here we investigated its prevalence in pediatric B-cell acute lymphoblastic leukemias (B-ALL), where SFs are not mutated. By comparing these samples to normal pro-B cells, we found thousands of aberrant local splice variations (LSVs) per sample, with 279 LSVs in 241 genes present in every comparison. These genes were enriched in RNA processing pathways and encoded ∼100 SFs, e.g. hnRNPA1. HNRNPA1 3'UTR was most pervasively mis-spliced, yielding the transcript subject to nonsense-mediated decay. To mimic this event, we knocked it down in B-lymphoblastoid cells and identified 213 hnRNPA1-regulated exon usage events comprising the hnRNPA1 splicing signature in pediatric leukemia. Some of its elements were LSVs in DICER1 and NT5C2, known cancer drivers. We searched for LSVs in other leukemia and lymphoma drivers and discovered 81 LSVs in 41 additional genes. Seventy-seven LSVs out of 81 were confirmed using two large independent B-ALL RNA-seq datasets, and the twenty most common B-ALL drivers, including NT5C2, showed higher prevalence of aberrant splicing than of somatic mutations. Thus, post-transcriptional deregulation of SF can drive widespread changes in B-ALL splicing and likely contributes to disease pathogenesis.
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Affiliation(s)
- Kathryn L Black
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Ammar S Naqvi
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.,Department of Biomedical & Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Mukta Asnani
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Katharina E Hayer
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.,Department of Biomedical & Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Scarlett Y Yang
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.,Immunology Graduate Group, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Elisabeth Gillespie
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Asen Bagashev
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Vinodh Pillai
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Sarah K Tasian
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Matthew R Gazzara
- Department of Biochemistry & Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.,Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Martin Carroll
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Deanne Taylor
- Department of Biomedical & Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.,Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kristen W Lynch
- Immunology Graduate Group, University of Pennsylvania, Philadelphia, PA 19104, USA.,Department of Biochemistry & Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Yoseph Barash
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.,Department of Computer and Information Science, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Andrei Thomas-Tikhonenko
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.,Immunology Graduate Group, University of Pennsylvania, Philadelphia, PA 19104, USA.,Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.,Department of Pathology & Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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38
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The Nonstructural NS1 Protein of Influenza Viruses Modulates TP53 Splicing through Host Factor CPSF4. J Virol 2019; 93:JVI.02168-18. [PMID: 30651364 DOI: 10.1128/jvi.02168-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 01/04/2019] [Indexed: 12/14/2022] Open
Abstract
Influenza A viruses (IAV) are known to modulate and "hijack" several cellular host mechanisms, including gene splicing and RNA maturation machineries. These modulations alter host cellular responses and enable an optimal expression of viral products throughout infection. The interplay between the host protein p53 and IAV, in particular through the viral nonstructural protein NS1, has been shown to be supportive for IAV replication. However, it remains unknown whether alternatively spliced isoforms of p53, known to modulate p53 transcriptional activity, are affected by IAV infection and contribute to IAV replication. Using a TP53 minigene, which mimics intron 9 alternative splicing, we have shown here that the NS1 protein of IAV changes the expression pattern of p53 isoforms. Our results demonstrate that CPSF4 (cellular protein cleavage and polyadenylation specificity factor 4) independently and the interaction between NS1 and CPSF4 modulate the alternative splicing of TP53 transcripts, which may result in the differential activation of p53-responsive genes. Finally, we report that CPSF4 and most likely beta and gamma spliced p53 isoforms affect both viral replication and IAV-associated type I interferon secretion. All together, our data show that cellular p53 and CPSF4 factors, both interacting with viral NS1, have a crucial role during IAV replication that allows IAV to interact with and alter the expression of alternatively spliced p53 isoforms in order to regulate the cellular innate response, especially via type I interferon secretion, and perform efficient viral replication.IMPORTANCE Influenza A viruses (IAV) constitute a major public health issue, causing illness and death in high-risk populations during seasonal epidemics or pandemics. IAV are known to modulate cellular pathways to promote their replication and avoid immune restriction via the targeting of several cellular proteins. One of these proteins, p53, is a master regulator involved in a large panel of biological processes, including cell cycle arrest, apoptosis, or senescence. This "cellular gatekeeper" is also involved in the control of viral infections, and viruses have developed a wide diversity of mechanisms to modulate/hijack p53 functions to achieve an optimal replication in their hosts. Our group and others have previously shown that p53 activity is finely modulated by different multilevel mechanisms during IAV infection. Here, we characterized IAV nonstructural protein NS1 and the cellular factor CPSF4 as major partners involved in the IAV-induced modulation of the TP53 alternative splicing that was associated with a strong modulation of p53 activity and notably the p53-mediated antiviral response.
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39
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Lei J, Qi R, Tang Y, Wang W, Wei G, Nussinov R, Ma B. Conformational stability and dynamics of the cancer-associated isoform Δ133p53β are modulated by p53 peptides and p53-specific DNA. FASEB J 2019; 33:4225-4235. [PMID: 30540922 PMCID: PMC6404584 DOI: 10.1096/fj.201801973r] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 11/12/2018] [Indexed: 01/01/2023]
Abstract
p53 is a tumor suppressor protein that maintains genome stability, but its Δ133p53β and Δ160p53β isoforms promote breast cancer cell invasion. The sequence truncations in the p53 core domain raise key questions related to their physicochemical properties, including structural stabilities, interaction mechanisms, and DNA-binding abilities. Herein, we investigated the conformational dynamics of Δ133p53β and Δ160p53β with and without binding to p53-specific DNA by using molecular dynamics simulations. We observed that the core domains of the 2 truncated isoforms are much less stable than wild-type (wt) p53β, and the increased solvent exposure of their aggregation-triggering segment indicates their higher aggregation propensities than wt p53. We also found that Δ133p53β stability is modulable by peptide or DNA interactions. Adding a p53 peptide (derived from truncated p53 sequence 107-129) may help stabilize Δ133p53. Most importantly, our simulations of p53 isomer-DNA complexes indicate that Δ133p53β dimer, but not Δ160p53β dimer, could form a stable complex with p53-specific DNA, which is consistent with recent experiments. This study provides physicochemical insight into Δ133p53β, Δ133p53β-DNA complexes, Δ133p53β's pathologic mechanism, and peptide-based inhibitor design against p53-related cancers.-Lei, J., Qi, R., Tang, Y., Wang, W., Wei, G., Nussinov, R., Ma, B. Conformational stability and dynamics of the cancer-associated isoform Δ133p53β are modulated by p53 peptides and p53-specific DNA.
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Affiliation(s)
- Jiangtao Lei
- State Key Laboratory of Surface Physics, Key Laboratory for Computational Physical Sciences–Ministry of Education, Department of Physics, Fudan University, Shanghai, China
| | - Ruxi Qi
- State Key Laboratory of Surface Physics, Key Laboratory for Computational Physical Sciences–Ministry of Education, Department of Physics, Fudan University, Shanghai, China
| | - Yegen Tang
- Department of Chemistry, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Wenning Wang
- Department of Chemistry, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Guanghong Wei
- State Key Laboratory of Surface Physics, Key Laboratory for Computational Physical Sciences–Ministry of Education, Department of Physics, Fudan University, Shanghai, China
| | - Ruth Nussinov
- Basic Science Program, Leidos Biomedical Research, Inc., Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland, USA; and
- Department of Human Genetics and Molecular Medicine, Sackler Institute of Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Buyong Ma
- Basic Science Program, Leidos Biomedical Research, Inc., Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland, USA; and
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40
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Zhang H, Zhao Y, Sun P, Zhao M, Su Z, Jin X, Song W. p53β: a new prognostic marker for patients with clear-cell renal cell carcinoma from 5.3 years of median follow-up. Carcinogenesis 2018; 39:368-374. [PMID: 29346503 DOI: 10.1093/carcin/bgy001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 01/10/2018] [Indexed: 12/19/2022] Open
Abstract
We previously reported six different p53 isoforms in renal cell carcinoma (RCC). In the present study, influences of p53β on recurrence-free survival (RFS) and overall survival (OS) were evaluated. Patients diagnosed with RCC in our center were into this study. mRNA expressions of p53 isoforms (p53α, p53β, p53γ) in tumors were determined by RT-PCR and real-time PCR. Functional yeast-based assay was performed to analyze p53 mutational status. p53β transfected 786-O and CAKi-1 cells were cultured to examine expressions of B-cell lymphoma 2-associated X protein (bax) and caspase-3, and ratios of apoptosis. After surgeries, all patients were followed up at programmed intervals. 266 patients were analyzed in this study. Median follow-up time was 5.3 years. RT-PCR (r = -0.72, P = 0.016) and real-time PCR (r = -0.65, P = 0.033) both showed only p53β expressed higher level in lower tumor stage versus higher stage. p53 wild-type and p53 mutation had comparable RFS (P = 0.361) and OS (P = 0.218), respectively. Kaplan-Meier analysis showed high p53β expression was associated with significantly improved RFS and OS, regardless of p53 mutational status. High p53β expression indicated better RFS [hazard ratio (HR) 2.599, 95% confidence interval (CI) 1.472-4.551, P = 0.038] and OS (HR 2.604, 95% CI 1.453-4.824, P = 0.031). p53β transfected 786-O and CAKi-1 cells expressed significantly higher level of bax and caspase-3, and had higher ratios of apoptosis than untransfected cells. Taken together, higher level of p53β predict better prognosis in patients with RCC through enhancing apoptosis in tumors.
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Affiliation(s)
- Haiyang Zhang
- Minimally Invasive Urology Center, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China.,School of Basic Medical Sciences, Shandong University, Jinan, China.,Knuppe Molecular Urology Laboratory, Department of Urology, School of Medicine, University of California, San Francisco, CA, USA
| | - Yong Zhao
- Minimally Invasive Urology Center, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China
| | - Peng Sun
- Minimally Invasive Urology Center, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China
| | - Miaoqing Zhao
- Department of Pathology, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China
| | - Zhenhui Su
- Department of Pathology, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China
| | - Xunbo Jin
- Minimally Invasive Urology Center, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China
| | - Wei Song
- Minimally Invasive Urology Center, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China
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High expression of the p53 isoform γ is associated with reduced progression-free survival in uterine serous carcinoma. BMC Cancer 2018; 18:684. [PMID: 29940909 PMCID: PMC6019524 DOI: 10.1186/s12885-018-4591-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 06/13/2018] [Indexed: 01/07/2023] Open
Abstract
Background Uterine serous carcinoma (USC) is a rare but aggressive subtype of endometrial carcinoma. Large-scale comprehensive efforts have resulted in an improved molecular understanding of its pathogenesis, and the p53 pathway has been proposed as a key player and is potentially targetable. Here we attempt to further portray the p53 pathway in USC by assessing p53 isoform expression. Methods We applied quantitative Real-Time PCRs (RT-qPCR) for expression analyses of total p53 mRNA as well as quantitative distinction of p53β, p53γ, and the total mRNA of amino-terminal truncated Δ40p53 and Δ133p53 in a retrospective cohort of 37 patients with USC. TP53 mutation status was assessed by targeted massive parallel sequencing. Findings were correlated with clinical data. Results The p53 isoform expression landscape in USCs was heterogeneous and dominated by total Δ133p53, while the distinct p53β and p53γ variants were found at much lower levels. The isoform expression profiles varied between samples, while their expression was independent of TP53 mutation status. We found high relative p53γ expression to be associated with reduced progression-free survival (PFS). Conclusions This is the first indication that elevated p53γ expression is associated with reduced PFS in USC. This single-center study may offer some insight in the landscape of p53 isoform expression in USC, but further validation studies are crucial to understand the context-dependent and tissue-specific role of the p53 isoform network in gynecological cancer. Electronic supplementary material The online version of this article (10.1186/s12885-018-4591-3) contains supplementary material, which is available to authorized users.
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Marcel V, Nguyen Van Long F, Diaz JJ. 40 Years of Research Put p53 in Translation. Cancers (Basel) 2018; 10:E152. [PMID: 29883412 PMCID: PMC5977125 DOI: 10.3390/cancers10050152] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/15/2018] [Accepted: 05/18/2018] [Indexed: 12/18/2022] Open
Abstract
Since its discovery in 1979, p53 has shown multiple facets. Initially the tumor suppressor p53 protein was considered as a stress sensor able to maintain the genome integrity by regulating transcription of genes involved in cell cycle arrest, apoptosis and DNA repair. However, it rapidly came into light that p53 regulates gene expression to control a wider range of biological processes allowing rapid cell adaptation to environmental context. Among them, those related to cancer have been extensively documented. In addition to its role as transcription factor, scattered studies reported that p53 regulates miRNA processing, modulates protein activity by direct interaction or exhibits RNA-binding activity, thus suggesting a role of p53 in regulating several layers of gene expression not restricted to transcription. After 40 years of research, it appears more and more clearly that p53 is strongly implicated in translational regulation as well as in the control of the production and activity of the translational machinery. Translation control of specific mRNAs could provide yet unsuspected capabilities to this well-known guardian of the genome.
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Affiliation(s)
- Virginie Marcel
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France.
| | - Flora Nguyen Van Long
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France.
| | - Jean-Jacques Diaz
- Univ Lyon, Université Claude Bernard Lyon 1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France.
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43
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Agostini M, Annicchiarico-Petruzzelli M, Melino G, Rufini A. Metabolic pathways regulated by TAp73 in response to oxidative stress. Oncotarget 2017; 7:29881-900. [PMID: 27119504 PMCID: PMC5058650 DOI: 10.18632/oncotarget.8935] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 04/16/2016] [Indexed: 02/06/2023] Open
Abstract
Reactive oxygen species are involved in both physiological and pathological processes including neurodegeneration and cancer. Therefore, cells have developed scavenging mechanisms to maintain redox homeostasis under control. Tumor suppressor genes play a critical role in the regulation of antioxidant genes. Here, we investigated whether the tumor suppressor gene TAp73 is involved in the regulation of metabolic adaptations triggered in response to oxidative stress. H2O2 treatment resulted in numerous biochemical changes in both control and TAp73 knockout (TAp73−/−) mouse embryonic fibroblasts, however the extent of these changes was more pronounced in TAp73−/− cells when compared to control cells. In particular, loss of TAp73 led to alterations in glucose, nucleotide and amino acid metabolism. In addition, H2O2 treatment resulted in increased pentose phosphate pathway (PPP) activity in null mouse embryonic fibroblasts. Overall, our results suggest that in the absence of TAp73, H2O2 treatment results in an enhanced oxidative environment, and at the same time in an increased pro-anabolic phenotype. In conclusion, the metabolic profile observed reinforces the role of TAp73 as tumor suppressor and indicates that TAp73 exerts this function, at least partially, by regulation of cellular metabolism.
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Affiliation(s)
- Massimiliano Agostini
- Medical Research Council, Toxicology Unit, Leicester University, Leicester, UK.,Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | | | - Gerry Melino
- Medical Research Council, Toxicology Unit, Leicester University, Leicester, UK.,Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Alessandro Rufini
- Department of Cancer Studies, CRUK Leicester Cancer Centre, University of Leicester, Leicester, UK
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Therapeutic Applications of Targeted Alternative Splicing to Cancer Treatment. Int J Mol Sci 2017; 19:ijms19010075. [PMID: 29283381 PMCID: PMC5796025 DOI: 10.3390/ijms19010075] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 12/22/2017] [Accepted: 12/24/2017] [Indexed: 12/16/2022] Open
Abstract
A growing body of studies has documented the pathological influence of impaired alternative splicing (AS) events on numerous diseases, including cancer. In addition, the generation of alternatively spliced isoforms is frequently noted to result in drug resistance in many cancer therapies. To gain comprehensive insights into the impacts of AS events on cancer biology and therapeutic developments, this paper highlights recent findings regarding the therapeutic routes of targeting alternative-spliced isoforms and splicing regulators to treatment strategies for distinct cancers.
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45
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Cowen LE, Tang Y. Identification of nonsense-mediated mRNA decay pathway as a critical regulator of p53 isoform β. Sci Rep 2017; 7:17535. [PMID: 29235495 PMCID: PMC5727530 DOI: 10.1038/s41598-017-17283-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 11/22/2017] [Indexed: 11/22/2022] Open
Abstract
Human TP53 gene encodes the tumor suppressor p53 and, via alternative splicing, the p53β and γ isoforms. Numerous studies have shown that p53β/γ can modulate p53 functions and are critically involved in regulation of cellular response to stress conditions. However, it is not fully understood how the β and γ isoforms are regulated following splicing. Using gene targeting and RNAi, we showed that depletion of the nonsense-mediated mRNA decay (NMD) factor SMG7 or UPF1 significantly induced p53β but had minimal effect on p53γ. Sequence analysis reveals the presence of unique features – key hallmarks of NMD targets in the p53β transcript, which was further confirmed in NMD reporter gene assays. By manipulating splicing components, we found that NMD activities are crucial to control p53β levels under conditions that favor its splicing. Our data demonstrate that the NMD and alternative splicing pathways regulate p53β in a synergistic manner, and NMD plays a critical role in the determination of the p53β following its splicing. As aberrant p53β expression and dysfunctional NMD are both implicated in cancers, our studies may provide a novel insight into the regulation of p53β in tumorigenic settings.
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Affiliation(s)
- Lauren E Cowen
- Department of Regenerative and Cancer Cell Biology, Albany Medical College 47 New Scotland Ave., Albany, NY, 12208, USA
| | - Yi Tang
- Department of Regenerative and Cancer Cell Biology, Albany Medical College 47 New Scotland Ave., Albany, NY, 12208, USA.
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46
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p73 promotes glioblastoma cell invasion by directly activating POSTN (periostin) expression. Oncotarget 2017; 7:11785-802. [PMID: 26930720 PMCID: PMC4914248 DOI: 10.18632/oncotarget.7600] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 01/18/2016] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma Multiforme is one of the most highly metastatic cancers and constitutes 70% of all gliomas. Despite aggressive treatments these tumours have an exceptionally bad prognosis, mainly due to therapy resistance and tumour recurrence. Here we show that the transcription factor p73 confers an invasive phenotype by directly activating expression of POSTN (periostin, HGNC:16953) in glioblastoma cells. Knock down of endogenous p73 reduces invasiveness and chemo-resistance, and promotes differentiation in vitro. Using chromatin immunoprecipitation and reporter assays we demonstrate that POSTN, an integrin binding protein that has recently been shown to play a major role in metastasis, is a transcriptional target of TAp73. We further show that POSTN overexpression is sufficient to rescue the invasive phenotype of glioblastoma cells after p73 knock down. Additionally, bioinformatics analysis revealed that an intact p73/POSTN axis, where POSTN and p73 expression is correlated, predicts bad prognosis in several cancer types. Taken together, our results support a novel role of TAp73 in controlling glioblastoma cell invasion by regulating the expression of the matricellular protein POSTN.
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47
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Song X, Zeng Z, Wei H, Wang Z. Alternative splicing in cancers: From aberrant regulation to new therapeutics. Semin Cell Dev Biol 2017; 75:13-22. [PMID: 28919308 DOI: 10.1016/j.semcdb.2017.09.018] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 09/09/2017] [Accepted: 09/11/2017] [Indexed: 12/18/2022]
Abstract
Alternative splicing is one of the most common mechanisms for gene regulation in humans, and plays a vital role to increase the complexity of functional proteins. In this article, we seek to provide a general review on the relationships between alternative splicing and tumorigenesis. We briefly introduce the basic rules for regulation of alternative splicing, and discuss recent advances on dynamic regulation of alternative splicing in cancers by highlighting the roles of a variety of RNA splicing factors in tumorigenesis. We further discuss several important questions regarding the splicing of long noncoding RNAs and back-splicing of circular RNAs in cancers. Finally, we discuss the current technologies that can be used to manipulate alternative splicing and serve as potential cancer treatment.
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Affiliation(s)
- Xiaowei Song
- CAS Key Lab for Computational Biology, CAS Center for Excellence in Molecular Cell Science, CAS-MPG Partner Institute for Computational Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China; Department of Cardiology, Changhai Hospital, 168 Changhai Road, Shanghai 200433, China.
| | - Zhenyu Zeng
- Department of Cardiology, Changhai Hospital, 168 Changhai Road, Shanghai 200433, China
| | - Huanhuan Wei
- CAS Key Lab for Computational Biology, CAS Center for Excellence in Molecular Cell Science, CAS-MPG Partner Institute for Computational Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Zefeng Wang
- CAS Key Lab for Computational Biology, CAS Center for Excellence in Molecular Cell Science, CAS-MPG Partner Institute for Computational Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
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Marini A, Lena AM, Panatta E, Ivan C, Han L, Liang H, Annicchiarico-Petruzzelli M, Di Daniele N, Calin GA, Candi E, Melino G. Ultraconserved long non-coding RNA uc.63 in breast cancer. Oncotarget 2017; 8:35669-35680. [PMID: 27447964 PMCID: PMC5482607 DOI: 10.18632/oncotarget.10572] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 05/13/2016] [Indexed: 12/13/2022] Open
Abstract
Transcribed-ultraconserved regions (T-UCRs) are long non-coding RNAs (lncRNA) encoded by a subset of long ultraconserved stretches in the human genome. Recent studies revealed that the expression of several T-UCRs is altered in cancer and growing evidences underline the importance of T-UCRs in oncogenesis, offering also potential new strategies for diagnosis and prognosis. We found that overexpression of one specific T-UCRs named uc.63 is associated with bad outcome in luminal A subtype of breast cancer patients. uc.63 is localized in the third intron of exportin-1 gene (XPO1) and is transcribed in the same orientation of its host gene. Interestingly, silencing of uc.63 induces apoptosis in vitro. However, silencing of host gene XPO1 does not cause the same effect suggesting that the transcription of uc.63 is independent of XPO1. Our results reveal an important role of uc.63 in promoting breast cancer cells survival and offer the prospect to identify a signature associated with poor prognosis.
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Affiliation(s)
- Alberto Marini
- Medical Research Council, Toxicology Unit, Hodgkin Building, University of Leicester, Leicester, UK
| | - Anna Maria Lena
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, Rome, Italy
| | - Emanuele Panatta
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, Rome, Italy
| | - Cristina Ivan
- Department of Experimental Therapeutics and The Center for RNA interference and non-coding RNA, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA
| | - Leng Han
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX, USA
| | - Han Liang
- Department of Bioinformatics and Computational Biology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA
| | | | - Nicola Di Daniele
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, Rome, Italy
| | - George A. Calin
- Department of Experimental Therapeutics and The Center for RNA interference and non-coding RNA, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA
| | - Eleonora Candi
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, Rome, Italy
- IDI-IRCCS, Biochemistry Laboratory, Rome, Italy
| | - Gerry Melino
- Medical Research Council, Toxicology Unit, Hodgkin Building, University of Leicester, Leicester, UK
- Department of Experimental Medicine and Surgery, University of Rome “Tor Vergata”, Rome, Italy
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Czubaty A, Piekiełko-Witkowska A. Protein kinases that phosphorylate splicing factors: Roles in cancer development, progression and possible therapeutic options. Int J Biochem Cell Biol 2017; 91:102-115. [PMID: 28552434 DOI: 10.1016/j.biocel.2017.05.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 05/16/2017] [Accepted: 05/18/2017] [Indexed: 11/30/2022]
Abstract
Disturbed alternative splicing is a common feature of human tumors. Splicing factors that control alternative splicing are phosphorylated by multiple kinases, including these that specifically add phosphoryl groups to serine-arginine rich proteins (e.g. SR-protein kinases, cdc2-like kinases, topoisomerase 1), and protein kinases that govern key cellular signaling pathways (i.e. AKT). Phosphorylation of splicing factors regulates their subcellular localization and interactions with target transcripts and protein partners, and thus significantly contributes the final result of splicing reactions. In this review we aim to summarize the current knowledge on the role of splicing kinases in cancer. Published studies and recently released data of The Cancer Genome Atlas demonstrate that expressions and activities of splicing kinases are commonly disturbed in cancers. Aberrant functioning of splicing kinases results in changed alternative splicing of tumor suppressors (e.g. p53) and regulators of cell signaling (e.g. MAPKs), apoptosis (e.g. MCL), and angiogenesis (VEGF). Splicing kinases act in complicated regulatory networks in which they mutually affect each other's activity to provide tight control of cellular signaling. Dysregulation of these regulatory networks contributes to oncogenic transformation, uncontrolled proliferation, enhanced migration and invasion. Furthermore, the activities of splicing kinases significantly contribute to cellular responses to genotoxic stress. In conclusion, published data provide strong evidence that splicing kinases emerge as important regulators of key processes governing malignant transformation, progression, and response to therapeutic treatments, suggesting their potential as clinically relevant targets.
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Affiliation(s)
- Alicja Czubaty
- Department of Molecular Biology, Faculty of Biology, University of Warsaw, ul. Miecznikowa 1, 02-096 Warsaw, Poland
| | - Agnieszka Piekiełko-Witkowska
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, ul. Marymoncka 99/103, 01-813 Warsaw, Poland.
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50
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Kelkar MG, Thakur B, Derle A, Chatterjee S, Ray P, De A. Tumor suppressor protein p53 exerts negative transcriptional regulation on human sodium iodide symporter gene expression in breast cancer. Breast Cancer Res Treat 2017; 164:603-615. [PMID: 28528452 DOI: 10.1007/s10549-017-4297-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/14/2017] [Indexed: 12/28/2022]
Abstract
PURPOSE Aberrant expression of human sodium iodide symporter (NIS) in breast cancer (BC) is well documented but the transcription factors (TF) regulating its aberrant expression is poorly known. We identify the presence of three p53 binding sites on the human NIS promoter sequence by conducting genome-wide TF analysis, and further investigate their regulatory role. METHODS The differences in transcription and translation were measured by real-time PCR, luciferase reporter assay, site-directed mutagenesis, in vivo optical imaging, and chromatin immunoprecipitation. The relation of NIS and p53 in clinical samples was judged by TCGA data analysis and immunohistochemistry. RESULTS Overexpression of wild-type p53 as a transgene or pharmacological activation by doxorubicin drug treatment shows significant suppression of NIS transcription in multiple BC cell types which also results in lowered NIS protein content and cellular iodide intake. NIS repression by activated p53 is further confirmed by non-invasive bioluminescence imaging in live cell and orthotropic tumor model. Abrogation of p53-binding sites by directional mutagenesis confirms reversal of transcriptional activity in wild-type p53-positive BC cells. We also observe direct binding of p53 to these sites on the human NIS promoter. Importantly, TCGA data analysis of NIS and p53 co-expression registers an inverse relationship between the two candidates. CONCLUSION Our data for the first time highlight the role of p53 as a negative regulator of functional NIS expression in BC, where the latter is a potential targeted radioiodine therapy candidate. Thus, the study provides an important insight into prospective clinical application of this approach that may significantly impact the patient with mutant versus wild-type p53 profile.
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Affiliation(s)
- Madhura G Kelkar
- Molecular Functional Imaging Lab, Tata Memorial Centre, ACTREC, Sector 22, Kharghar, Navi Mumbai, 410210, India.,Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India
| | - Bhushan Thakur
- Imaging Cell Signaling and Therapeutics Lab, Tata Memorial Centre, ACTREC, Navi Mumbai, India.,Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India
| | - Abhishek Derle
- Molecular Functional Imaging Lab, Tata Memorial Centre, ACTREC, Sector 22, Kharghar, Navi Mumbai, 410210, India
| | - Sushmita Chatterjee
- Molecular Functional Imaging Lab, Tata Memorial Centre, ACTREC, Sector 22, Kharghar, Navi Mumbai, 410210, India
| | - Pritha Ray
- Imaging Cell Signaling and Therapeutics Lab, Tata Memorial Centre, ACTREC, Navi Mumbai, India.,Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India
| | - Abhijit De
- Molecular Functional Imaging Lab, Tata Memorial Centre, ACTREC, Sector 22, Kharghar, Navi Mumbai, 410210, India. .,Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India.
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