1
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Kim DE, Byeon HE, Kim DH, Kim SG, Yim H. Plk2-mediated phosphorylation and translocalization of Nrf2 activates anti-inflammation through p53/Plk2/p21 cip1 signaling in acute kidney injury. Cell Biol Toxicol 2023; 39:1509-1529. [PMID: 35842499 PMCID: PMC10425522 DOI: 10.1007/s10565-022-09741-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 06/29/2022] [Indexed: 11/30/2022]
Abstract
The Plk2 is a cellular stress-responsive factor that is induced in response to oxidative stress. However, the roles of Plk2 in acute kidney injury (AKI) have not been clarified. We previously found that Plk2 is an interacting factor of Nrf2 in response to cellular stress, since Plk2 is upregulated in the Nrf2-dependent network. Here, we show that the levels of p53, Plk2, p21cip1, and chromatin-bound Nrf2 were all upregulated in kidney tissues of mice or NRK52E cells treated with either cisplatin or methotrexate. Upregulation of Plk2 by p53 led to an increase of Nrf2 in both soluble and chromatin fractions in cisplatin-treated NRK52E cells. Consistently, depletion of Plk2 suppressed the levels of Nrf2. Of note, Plk2 directly phosphorylated Nrf2 at Ser40, which facilitated its interaction with p21cip1 and translocation into the nuclei for the activation of anti-oxidative and anti-inflammatory factors in response to AKI. Together, these findings suggest that Plk2 may serve as an anti-oxidative and anti-inflammatory regulator through the phosphorylation and activation of Nrf2 to protect kidney cells from kidney toxicants and that Plk2 and Nrf2 therefore work cooperatively for the protection and survival of kidney cells from harmful stresses.
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Affiliation(s)
- Da-Eun Kim
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, 15588, Gyeonggi-do, Korea
| | - Hye Eun Byeon
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, 15588, Gyeonggi-do, Korea
| | - Dae-Hoon Kim
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, 15588, Gyeonggi-do, Korea
| | - Sang Geon Kim
- College of Pharmacy and Integrated Research Institute for Drug Development, Dongguk University-Seoul, Goyang-si, 10326, Gyeonggi-Do, Korea.
- College of Pharmacy, Seoul National University, Gwanakro 599, Seoul, 08826, Korea.
| | - Hyungshin Yim
- Department of Pharmacy, College of Pharmacy, Institute of Pharmaceutical Science and Technology, Hanyang University, Ansan, 15588, Gyeonggi-do, Korea.
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2
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Wang Y, Yan K, Wang L, Bi J. Genome instability-related long non-coding RNA in clear renal cell carcinoma determined using computational biology. BMC Cancer 2021; 21:727. [PMID: 34167490 PMCID: PMC8229419 DOI: 10.1186/s12885-021-08356-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 04/29/2021] [Indexed: 12/04/2022] Open
Abstract
Background There is evidence that long non-coding RNA (lncRNA) is related to genetic stability. However, the complex biological functions of these lncRNAs are unclear. Method TCGA - KIRC lncRNAs expression matrix and somatic mutation information data were obtained from TCGA database. “GSVA” package was applied to evaluate the genomic related pathway in each samples. GO and KEGG analysis were performed to show the biological function of lncRNAs-mRNAs. “Survival” package was applied to determine the prognostic significance of lncRNAs. Multivariate Cox proportional hazard regression analysis was applied to conduct lncRNA prognosis model. Results In the present study, we applied computational biology to identify genome-related long noncoding RNA and identified 26 novel genomic instability-associated lncRNAs in clear cell renal cell carcinoma. We identified a genome instability-derived six lncRNA-based gene signature that significantly divided clear renal cell samples into high- and low-risk groups. We validated it in test cohorts. To further elucidate the role of the six lncRNAs in the model’s genome stability, we performed a gene set variation analysis (GSVA) on the matrix. We performed Pearson correlation analysis between the GSVA scores of genomic stability-related pathways and lncRNA. It was determined that LINC00460 and LINC01234 could be used as critical factors in this study. They may influence the genome stability of clear cell carcinoma by participating in mediating critical targets in the base excision repair pathway, the DNA replication pathway, homologous recombination, mismatch repair pathway, and the P53 signaling pathway. Conclusion subsections These data suggest that LINC00460 and LINC01234 are crucial for the stability of the clear cell renal cell carcinoma genome. Supplementary Information The online version contains supplementary material available at 10.1186/s12885-021-08356-9.
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Affiliation(s)
- Yutao Wang
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, Liaoning, China
| | - Kexin Yan
- Department of Dermatology, China Medical University, The First Hospital of China Medical University, Shenyang, Liaoning, China
| | - Linhui Wang
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, Liaoning, China
| | - Jianbin Bi
- Department of Urology, China Medical University, The First Hospital of China Medical University, Shenyang, Liaoning, China.
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3
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Hanasaki M, Yaku K, Yamauchi M, Nakagawa T, Masumoto H. Deletion of the GAPDH gene contributes to genome stability in Saccharomyces cerevisiae. Sci Rep 2020; 10:21146. [PMID: 33273685 PMCID: PMC7713361 DOI: 10.1038/s41598-020-78302-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 11/17/2020] [Indexed: 12/30/2022] Open
Abstract
Cellular metabolism is directly or indirectly associated with various cellular processes by producing a variety of metabolites. Metabolic alterations may cause adverse effects on cell viability. However, some alterations potentiate the rescue of the malfunction of the cell system. Here, we found that the alteration of glucose metabolism suppressed genome instability caused by the impairment of chromatin structure. Deletion of the TDH2 gene, which encodes glyceraldehyde 3-phospho dehydrogenase and is essential for glycolysis/gluconeogenesis, partially suppressed DNA damage sensitivity due to chromatin structure, which was persistently acetylated histone H3 on lysine 56 in cells with deletions of both HST3 and HST4, encoding NAD+-dependent deacetylases. tdh2 deletion also restored the short replicative lifespan of cells with deletion of sir2, another NAD+-dependent deacetylase, by suppressing intrachromosomal recombination in rDNA repeats increased by the unacetylated histone H4 on lysine 16. tdh2 deletion also suppressed recombination between direct repeats in hst3∆ hst4∆ cells by suppressing the replication fork instability that leads to both DNA deletions among repeats. We focused on quinolinic acid (QUIN), a metabolic intermediate in the de novo nicotinamide adenine dinucleotide (NAD+) synthesis pathway, which accumulated in the tdh2 deletion cells and was a candidate metabolite to suppress DNA replication fork instability. Deletion of QPT1, quinolinate phosphoribosyl transferase, elevated intracellular QUIN levels and partially suppressed the DNA damage sensitivity of hst3∆ hst4∆ cells as well as tdh2∆ cells. qpt1 deletion restored the short replicative lifespan of sir2∆ cells by suppressing intrachromosomal recombination among rDNA repeats. In addition, qpt1 deletion could suppress replication fork slippage between direct repeats. These findings suggest a connection between glucose metabolism and genomic stability.
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Affiliation(s)
- Miki Hanasaki
- Biomedical Research Support Center (BRSC), Nagasaki University School of Medicine, 1-12-4 Sakamoto, Nagasaki, Nagasaki, 852-8523, Japan
| | - Keisuke Yaku
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, 2630 Sugitani, Toyama, Toyama, 930-0194, Japan
| | - Motohiro Yamauchi
- Department of Radiation Biology and Protection, Atomic Bomb Disease Institute, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, Nagasaki, 852-8523, Japan
| | - Takashi Nakagawa
- Department of Metabolism and Nutrition, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, 2630 Sugitani, Toyama, Toyama, 930-0194, Japan
| | - Hiroshi Masumoto
- Biomedical Research Support Center (BRSC), Nagasaki University School of Medicine, 1-12-4 Sakamoto, Nagasaki, Nagasaki, 852-8523, Japan.
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4
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Umar SA, Tasduq SA. Integrating DNA damage response and autophagy signalling axis in ultraviolet-B induced skin photo-damage: a positive association in protecting cells against genotoxic stress. RSC Adv 2020; 10:36317-36336. [PMID: 35517978 PMCID: PMC9057019 DOI: 10.1039/d0ra05819j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 09/13/2020] [Indexed: 01/27/2023] Open
Abstract
The skin acts as both physical as well as an immunological barrier against hazardous agents from the outside environment and protects the internal organs against damage. Skin ageing is a dynamic process caused by the influence of various external factors, including damage from ultraviolet (UV-B) radiation, which is known as photo-ageing, and due to internal chronological mechanisms. A normal ageing process requires several orchestrated defense mechanisms to diverse types of stress responses, the concomitant renewal of cellular characteristics, and the homeostasis of different cell types that directly or indirectly protect the integrity of skin. Cumulative oxidative and endoplasmic reticulum (ER) stress responses and their adverse impact on biological systems in the skin are a common mechanism of the ageing process, negatively impacting DNA by causing mutations that lead to many physiological, functional, and aesthetic changes in the skin, culminating in the development of many diseases, including photo-damage and photo-carcinogenesis. Exposure of the skin to ultraviolet-(B) elicits the activation of signal transduction pathways, including DNA damage response, autophagy, and checkpoint signal adaptations associated with clearing radiation-induced DNA damage. Recent experimental reports suggest that autophagy is involved in maintaining skin homeostasis upon encountering different stresses, notably genotoxic stress. It has also been revealed that autophagy positively regulates the recognition of DNA damage by nucleotide excision repair and that skin ageing is associated with defects in the autophagy process. Moreover, autophagy is constitutively active in the skin epithelium, imparting protection to skin cells against a diverse range of outside insults, thus increasing resistance to environmental stressors. It has also been found that the stress-induced suppression of the autophagy response in experimental settings leads to enhanced apoptosis during photo-ageing upon UV-B exposure and that the maintenance of homeostasis depends on cellular autophagy levels. More recent reports in this domain claim that relieving the oxidative-stress-mediated induction of the ER stress response upon UV-B irradiation protects skin cells from photo-damage effects. The integration of autophagy and the DNA damage response under genotoxic stress is being considered as a meaningful partnership for finding novel molecular targets and devising suitable therapeutic strategies against photo-ageing disorders. Here, we summarize and review the current understanding of the mechanisms governing the intricate interplay between autophagy and the DNA damage response and its regulation by UV-B, the roles of autophagy in regulating the cellular response to UV-B-induced photodamage, and the implications of the modulation of autophagy as a meaningful partnership in the treatment and prevention of photoaging disorders.
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Affiliation(s)
- Sheikh Ahmad Umar
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
- Pharmacokinetics-Pharmacodynamics and Toxicology Division, CSIR-Indian Institute of Integrative Medicine Jammu Tawi Jammu and Kashmir India +91-1912569000-10 ext.332
| | - Sheikh Abdullah Tasduq
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
- Pharmacokinetics-Pharmacodynamics and Toxicology Division, CSIR-Indian Institute of Integrative Medicine Jammu Tawi Jammu and Kashmir India +91-1912569000-10 ext.332
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5
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Sousa JFD, Serafim RB, Freitas LMD, Fontana CR, Valente V. DNA repair genes in astrocytoma tumorigenesis, progression and therapy resistance. Genet Mol Biol 2019; 43:e20190066. [PMID: 31930277 PMCID: PMC7198033 DOI: 10.1590/1678-4685-gmb-2019-0066] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 07/21/2019] [Indexed: 12/26/2022] Open
Abstract
Glioblastoma (GBM) is the most common and malignant type of primary brain tumor,
showing rapid development and resistance to therapies. On average, patients
survive 14.6 months after diagnosis and less than 5% survive five years or more.
Several pieces of evidence have suggested that the DNA damage signaling and
repair activities are directly correlated with GBM phenotype and exhibit
opposite functions in cancer establishment and progression. The functions of
these pathways appear to present a dual role in tumorigenesis and cancer
progression. Activation and/or overexpression of ATRX, ATM and RAD51 genes were
extensively characterized as barriers for GBM initiation, but paradoxically the
exacerbated activity of these genes was further associated with cancer
progression to more aggressive stages. Excessive amounts of other DNA repair
proteins, namely HJURP, EXO1, NEIL3, BRCA2, and BRIP, have also been connected
to proliferative competence, resistance and poor prognosis. This scenario
suggests that these networks help tumor cells to manage replicative stress and
treatment-induced damage, diminishing genome instability and conferring therapy
resistance. Finally, in this review we address promising new drugs and
therapeutic approaches with potential to improve patient survival. However,
despite all technological advances, the prognosis is still dismal and further
research is needed to dissect such complex mechanisms.
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Affiliation(s)
- Juliana Ferreira de Sousa
- Radiation Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, U.S.A
| | - Rodolfo Bortolozo Serafim
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
| | - Laura Marise de Freitas
- Universidade de São Paulo, Instituto de Química, Departamento de Bioquímica, São Paulo, SP, Brazil
| | - Carla Raquel Fontana
- Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Faculdade de Ciências Farmacêuticas, Departamento de Análises Clínicas, Araraquara, SP, Brazil
| | - Valeria Valente
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Biologia Celular e Molecular e Bioagentes Patogênicos, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.,Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Faculdade de Ciências Farmacêuticas, Departamento de Análises Clínicas, Araraquara, SP, Brazil.,Centro de Terapia Celular (CEPID-FAPESP), Ribeirão Preto, SP, Brazil
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6
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Ramteke P, Deb A, Shepal V, Bhat MK. Hyperglycemia Associated Metabolic and Molecular Alterations in Cancer Risk, Progression, Treatment, and Mortality. Cancers (Basel) 2019; 11:E1402. [PMID: 31546918 PMCID: PMC6770430 DOI: 10.3390/cancers11091402] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/15/2019] [Accepted: 08/20/2019] [Indexed: 12/12/2022] Open
Abstract
Cancer and diabetes are amongst the leading causes of deaths worldwide. There is an alarming rise in cancer incidences and mortality, with approximately 18.1 million new cases and 9.6 million deaths in 2018. A major contributory but neglected factor for risk of neoplastic transformation is hyperglycemia. Epidemiologically too, lifestyle patterns resulting in high blood glucose level, with or without the role of insulin, are more often correlated with cancer risk, progression, and mortality. The two conditions recurrently exist in comorbidity, and their interplay has rendered treatment regimens more challenging by restricting the choice of drugs, affecting surgical consequences, and having associated fatal complications. Limited comprehensive literature is available on their correlation, and a lack of clarity in understanding in such comorbid conditions contributes to higher mortality rates. Hence, a critical analysis of the elements responsible for enhanced mortality due to hyperglycemia-cancer concomitance is warranted. Given the lifestyle changes in the human population, increasing metabolic disorders, and glucose addiction of cancer cells, hyperglycemia related complications in cancer underline the necessity for further in-depth investigations. This review, therefore, attempts to shed light upon hyperglycemia associated factors in the risk, progression, mortality, and treatment of cancer to highlight important mechanisms and potential therapeutic targets.
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Affiliation(s)
- Pranay Ramteke
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
| | - Ankita Deb
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
| | - Varsha Shepal
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
| | - Manoj Kumar Bhat
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
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7
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Bender CM, Merriman JD, Sereika SM, Gentry AL, Casillo FE, Koleck TA, Rosenzweig MQ, Brufsky AM, McAuliffe P, Zhu Y, Conley YP. Trajectories of Cognitive Function and Associated Phenotypic and Genotypic Factors in Breast Cancer. Oncol Nurs Forum 2019; 45:308-326. [PMID: 29683114 DOI: 10.1188/18.onf.308-326] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVES This study identified women with unique trajectories of executive function, concentration, and visual working memory before and during adjuvant therapy for breast cancer, and examined phenotypic and genotypic predictors associated with subgroups. SAMPLE & SETTING 399 postmenopausal women, of whom 288 were women with early-stage breast cancer and 111 were women without breast cancer, matched on age and years of education to the women with breast cancer, and all at an urban cancer center. METHODS & VARIABLES A repeated-measures design was used; assessments occurred before adjuvant therapy and every six months post-therapy initiation. Group-based trajectory modeling determined subgroups. Multinomial logistic regression identified phenotypic and genotypic characteristics. RESULTS Three executive function and concentration trajectory subgroups were identified. IMPLICATIONS FOR NURSING Advancing age, greater pretherapy fatigue, and poorer pretherapy cognitive function are associated with the low subgroups. DNA repair and oxidative stress mechanisms may be involved in the cognitive changes that women experience.
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Affiliation(s)
| | | | - Susan M Sereika
- Associate professors School of Nursing, University of Pittsburgh, Pennsylvania
| | - Amanda L Gentry
- Department of Health and Community Systems, School of Medicine
| | - Frances E Casillo
- Department of Acute and Tertiary Care, Office of Community Partnerships
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8
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Zolotovskaia MA, Sorokin MI, Roumiantsev SA, Borisov NM, Buzdin AA. Pathway Instability Is an Effective New Mutation-Based Type of Cancer Biomarkers. Front Oncol 2019; 8:658. [PMID: 30662873 PMCID: PMC6328788 DOI: 10.3389/fonc.2018.00658] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 12/12/2018] [Indexed: 01/20/2023] Open
Abstract
DNA mutations play a crucial role in cancer development and progression. Mutation profiles vary dramatically in different cancer types and between individual tumors. Mutations of several individual genes are known as reliable cancer biomarkers, although the number of such genes is tiny and does not enable differential diagnostics for most of the cancers. We report here a technique enabling dramatically increased efficiency of cancer biomarkers development using DNA mutations data. It includes a quantitative metric termed Pathway instability (PI) based on mutations enrichment of intracellular molecular pathways. This method was tested on 5,956 tumor mutation profiles of 15 cancer types from The Cancer Genome Atlas (TCGA) project. Totally, we screened 2,316,670 mutations in 19,872 genes and 1,748 molecular pathways. Our results demonstrated considerable advantage of pathway-based mutation biomarkers over individual gene mutation profiles, as reflected by more than two orders of magnitude greater numbers by high-quality [ROC area-under-curve (AUC)>0.75] biomarkers. For example, the number of such high-quality mutational biomarkers distinguishing between different cancer types was only six for the individual gene mutations, and already 660 for the pathway-based biomarkers. These results evidence that PI value can be used as a new generation of complex cancer biomarkers significantly outperforming the existing gene mutation biomarkers.
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Affiliation(s)
- Marianna A Zolotovskaia
- Department of Oncology, Hematology and Radiotherapy of Pediatric Faculty, Pirogov Russian National Research Medical University, Moscow, Russia.,Oncobox Ltd., Moscow, Russia
| | - Maxim I Sorokin
- The Laboratory of Clinical Bioinformatics, I.M. Sechenov First Moscow State Medical University, Moscow, Russia.,Omicsway Corp., Walnut, CA, United States
| | - Sergey A Roumiantsev
- Department of Oncology, Hematology and Radiotherapy of Pediatric Faculty, Pirogov Russian National Research Medical University, Moscow, Russia
| | - Nikolay M Borisov
- Oncobox Ltd., Moscow, Russia.,The Laboratory of Clinical Bioinformatics, I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Anton A Buzdin
- The Laboratory of Clinical Bioinformatics, I.M. Sechenov First Moscow State Medical University, Moscow, Russia.,Omicsway Corp., Walnut, CA, United States.,The Laboratory of Systems Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Moscow, Russia
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9
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Abstract
Accurate transmission of the genetic information requires complete duplication of the chromosomal DNA each cell division cycle. However, the idea that replication forks would form at origins of DNA replication and proceed without impairment to copy the chromosomes has proven naive. It is now clear that replication forks stall frequently as a result of encounters between the replication machinery and template damage, slow-moving or paused transcription complexes, unrelieved positive superhelical tension, covalent protein-DNA complexes, and as a result of cellular stress responses. These stalled forks are a major source of genome instability. The cell has developed many strategies for ensuring that these obstructions to DNA replication do not result in loss of genetic information, including DNA damage tolerance mechanisms such as lesion skipping, whereby the replisome jumps the lesion and continues downstream; template switching both behind template damage and at the stalled fork; and the error-prone pathway of translesion synthesis.
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Affiliation(s)
- Kenneth J Marians
- Molecular Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA;
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10
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Monzo-Beltran L, Vazquez-Tarragón A, Cerdà C, Garcia-Perez P, Iradi A, Sánchez C, Climent B, Tormos C, Vázquez-Prado A, Girbés J, Estáñ N, Blesa S, Cortés R, Chaves FJ, Sáez GT. One-year follow-up of clinical, metabolic and oxidative stress profile of morbid obese patients after laparoscopic sleeve gastrectomy. 8-oxo-dG as a clinical marker. Redox Biol 2017; 12:389-402. [PMID: 28319890 PMCID: PMC5357674 DOI: 10.1016/j.redox.2017.02.003] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 02/01/2017] [Accepted: 02/05/2017] [Indexed: 02/07/2023] Open
Abstract
Obesity has grown worldwide over the last few decades. In its different degrees, obesity is accompanied by many clinical and biochemical alterations reflecting the pathological condition of various body tissues. Among the mechanisms underlying the pathogenesis of obesity and associated complications, oxidative stress (OS) may be playing an important role. In the present study, we have characterized at systemic level the degree of OS status in a group of morbid obese patients (BMI>40kg/m2) at basal sate and its modulation during one year after bariatric surgery using the laparoscopic sleeve gastrectomy (LSG) technique. As compared with normal weight subjects matched in age, peripheral blood mononuclear cells (PBMc) of obese patients present a significant reduction of the antioxidant enzyme activities superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) as well as a significant increase of the oxidized/reduced glutathione ratio (GSSG/GSH) in these cells. Lipid peroxidation is significantly increased in the patient group as shown by the increased levels of malondialdehyde (MDA) in PBMc and the amount of F2-Isoprostanes (F2-IsoPs) released in urine. In addition, the DNA damage product 8-oxo-7,8-2'-deoxyguanosine (8-oxo-dG) was also observed to be increased in serum and urine of morbid obese patients as compared with the control group. After LSG, an improvement of their ponderal and metabolic profile was accompanied by a progressive recovery of antioxidant enzyme activities and the decline of oxidative byproducts both in PBMc and biological fluids. The observed changes of urinary 8-oxo-dG levels correlate positively with its serum concentration, the lipid peroxidation products MDA and F2-IsoPs, triglycerides, glucose, insulin, HOMA index and body weight and negatively with the percentage of weight and BMI loss and antioxidant activities. We conclude that the analysis of urinary 8-oxo-dG could be validated as a useful marker for the monitoring of ponderal and metabolic status of morbid obese patients.
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Affiliation(s)
- Lidia Monzo-Beltran
- Dept. of Biochemistry and Molecular Biology, Faculty of Medicine and Odontology-INCLIVA, University of Valencia, Spain.
| | | | - Concha Cerdà
- Service of Clinical Analysis, General University Hospital, Valencia, Spain.
| | - Paula Garcia-Perez
- Dept. of Biochemistry and Molecular Biology, Faculty of Medicine and Odontology-INCLIVA, University of Valencia, Spain.
| | - Antonio Iradi
- Dept. of Physiology, Faculty of Medicine and Odontology, University of Valencia, Spain.
| | - Carlos Sánchez
- Endocrinology and Nutrition Unit, General University Hospital, Valencia, Spain.
| | - Benjamin Climent
- Service of Internal Medicine, General University Hospital, Valencia, Spain.
| | - Carmen Tormos
- Dept. of Biochemistry and Molecular Biology, Faculty of Medicine and Odontology-INCLIVA, University of Valencia, Spain.
| | - Antonio Vázquez-Prado
- Service of General and Digestive Surgery, General University Hospital, Valencia, Spain.
| | - Javier Girbés
- Service of Clinical Analysis, University Hospital Dr. Peset, Valencia, Spain.
| | - Nuria Estáñ
- Service of Clinical Analysis, University Hospital Dr. Peset, Valencia, Spain.
| | - Sebastián Blesa
- Genomic and Genetic Diagnosis Unit, INCLIVA, CIBEREDEM University of Valencia, Spain.
| | - Raquel Cortés
- Genomic and Genetic Diagnosis Unit, INCLIVA, CIBEREDEM University of Valencia, Spain.
| | - Felipe J Chaves
- Genomic and Genetic Diagnosis Unit, INCLIVA, CIBEREDEM University of Valencia, Spain.
| | - Guillermo T Sáez
- Dept. of Biochemistry and Molecular Biology, Faculty of Medicine and Odontology-INCLIVA, University of Valencia, Spain; Service of Clinical Analysis, University Hospital Dr. Peset, Valencia, Spain.
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11
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Wu X, Cao N, Fenech M, Wang X. Role of Sirtuins in Maintenance of Genomic Stability: Relevance to Cancer and Healthy Aging. DNA Cell Biol 2016; 35:542-575. [DOI: 10.1089/dna.2016.3280] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Xiayu Wu
- School of Life Sciences, The Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, Yunnan, China
| | - Neng Cao
- School of Life Sciences, The Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, Yunnan, China
| | - Michael Fenech
- Genome Health and Personalized Nutrition, Commonwealth Scientific and Industrial Research Organization Food and Nutrition, Adelaide, South Australia, Australia
| | - Xu Wang
- School of Life Sciences, The Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, Yunnan, China
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12
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Affiliation(s)
- Michal Goldberg
- a Department of Genetics ; Alexander Silberman Institute of Life Sciences; Hebrew University of Jerusalem ; Jerusalem , Israel
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13
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Ferguson LR, Chen H, Collins AR, Connell M, Damia G, Dasgupta S, Malhotra M, Meeker AK, Amedei A, Amin A, Ashraf SS, Aquilano K, Azmi AS, Bhakta D, Bilsland A, Boosani CS, Chen S, Ciriolo MR, Fujii H, Guha G, Halicka D, Helferich WG, Keith WN, Mohammed SI, Niccolai E, Yang X, Honoki K, Parslow VR, Prakash S, Rezazadeh S, Shackelford RE, Sidransky D, Tran PT, Yang ES, Maxwell CA. Genomic instability in human cancer: Molecular insights and opportunities for therapeutic attack and prevention through diet and nutrition. Semin Cancer Biol 2015; 35 Suppl:S5-S24. [PMID: 25869442 PMCID: PMC4600419 DOI: 10.1016/j.semcancer.2015.03.005] [Citation(s) in RCA: 188] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 03/08/2015] [Accepted: 03/13/2015] [Indexed: 02/06/2023]
Abstract
Genomic instability can initiate cancer, augment progression, and influence the overall prognosis of the affected patient. Genomic instability arises from many different pathways, such as telomere damage, centrosome amplification, epigenetic modifications, and DNA damage from endogenous and exogenous sources, and can be perpetuating, or limiting, through the induction of mutations or aneuploidy, both enabling and catastrophic. Many cancer treatments induce DNA damage to impair cell division on a global scale but it is accepted that personalized treatments, those that are tailored to the particular patient and type of cancer, must also be developed. In this review, we detail the mechanisms from which genomic instability arises and can lead to cancer, as well as treatments and measures that prevent genomic instability or take advantage of the cellular defects caused by genomic instability. In particular, we identify and discuss five priority targets against genomic instability: (1) prevention of DNA damage; (2) enhancement of DNA repair; (3) targeting deficient DNA repair; (4) impairing centrosome clustering; and, (5) inhibition of telomerase activity. Moreover, we highlight vitamin D and B, selenium, carotenoids, PARP inhibitors, resveratrol, and isothiocyanates as priority approaches against genomic instability. The prioritized target sites and approaches were cross validated to identify potential synergistic effects on a number of important areas of cancer biology.
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Affiliation(s)
| | - Helen Chen
- Department of Pediatrics, University of British Columbia, Michael Cuccione Childhood Cancer Research Program, Child and Family Research Institute, Vancouver, Canada
| | - Andrew R Collins
- Department of Nutrition, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Marisa Connell
- Department of Pediatrics, University of British Columbia, Michael Cuccione Childhood Cancer Research Program, Child and Family Research Institute, Vancouver, Canada
| | - Giovanna Damia
- Department of Oncology, Instituti di Ricovero e Cura a Carattere Scientifico-Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy
| | - Santanu Dasgupta
- Department of Cellular and Molecular Biology, The University of Texas Health Science Center at Tyler, Tyler, United States
| | | | - Alan K Meeker
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, United States
| | - Amedeo Amedei
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Amr Amin
- Department of Biology, College of Science, United Arab Emirates University, Al Ain, United Arab Emirates; Faculty of Science, Cairo University, Cairo, Egypt
| | - S Salman Ashraf
- Department of Chemistry, College of Science, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Katia Aquilano
- Department of Biology, Università di Roma Tor Vergata, Rome, Italy
| | - Asfar S Azmi
- Department of Biology, University of Rochester, Rochester, United States
| | - Dipita Bhakta
- School of Chemical and BioTechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - Alan Bilsland
- Institute of Cancer Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Chandra S Boosani
- Department of BioMedical Sciences, Creighton University, Omaha, NE, United States
| | - Sophie Chen
- Department of Research & Development, Ovarian and Prostate Cancer Research Trust Laboratory, Guildford, Surrey, United Kingdom
| | | | - Hiromasa Fujii
- Department of Orthopaedic Surgery, Nara Medical University, Kashihara, Nara, Japan
| | - Gunjan Guha
- School of Chemical and BioTechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | | | - William G Helferich
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - W Nicol Keith
- Institute of Cancer Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Sulma I Mohammed
- Department of Comparative Pathobiology and Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN, United States
| | - Elena Niccolai
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Xujuan Yang
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - Kanya Honoki
- Department of Orthopaedic Surgery, Nara Medical University, Kashihara, Nara, Japan
| | | | - Satya Prakash
- School of Pharmacy, University College Cork, Cork, Ireland
| | - Sarallah Rezazadeh
- Department of Biology, University of Rochester, Rochester, United States
| | - Rodney E Shackelford
- Department of Pathology, Louisiana State University Health Shreveport, Shreveport, LA, United States
| | - David Sidransky
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Phuoc T Tran
- Departments of Radiation Oncology & Molecular Radiation Sciences, Oncology and Urology, The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Eddy S Yang
- Department of Radiation Oncology, University of Alabama at Birmingham School of Medicine, Birmingham, AL, United States
| | - Christopher A Maxwell
- Department of Pediatrics, University of British Columbia, Michael Cuccione Childhood Cancer Research Program, Child and Family Research Institute, Vancouver, Canada.
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Galgano A, Barinov A, Vasseur F, de Villartay JP, Rocha B. CD8 Memory Cells Develop Unique DNA Repair Mechanisms Favoring Productive Division. PLoS One 2015; 10:e0140849. [PMID: 26485718 PMCID: PMC4613136 DOI: 10.1371/journal.pone.0140849] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 10/01/2015] [Indexed: 11/19/2022] Open
Abstract
Immune responses are efficient because the rare antigen-specific naïve cells are able to proliferate extensively and accumulate upon antigen stimulation. Moreover, differentiation into memory cells actually increases T cell accumulation, indicating improved productive division in secondary immune responses. These properties raise an important paradox: how T cells may survive the DNA lesions necessarily induced during their extensive division without undergoing transformation. We here present the first data addressing the DNA damage responses (DDRs) of CD8 T cells in vivo during exponential expansion in primary and secondary responses in mice. We show that during exponential division CD8 T cells engage unique DDRs, which are not present in other exponentially dividing cells, in T lymphocytes after UV or X irradiation or in non-metastatic tumor cells. While in other cell types a single DDR pathway is affected, all DDR pathways and cell cycle checkpoints are affected in dividing CD8 T cells. All DDR pathways collapse in secondary responses in the absence of CD4 help. CD8 T cells are driven to compulsive suicidal divisions preventing the propagation of DNA lesions. In contrast, in the presence of CD4 help all the DDR pathways are up regulated, resembling those present in metastatic tumors. However, this up regulation is present only during the expansion phase; i.e., their dependence on antigen stimulation prevents CD8 transformation. These results explain how CD8 T cells maintain genome integrity in spite of their extensive division, and highlight the fundamental role of DDRs in the efficiency of CD8 immune responses.
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Affiliation(s)
- Alessia Galgano
- INSERM, U1020, CNRS, UMR 8253, Medical Faculty Paris Descartes, Université Paris Descartes Sorbonne Paris Cité, Paris, France
| | - Aleksandr Barinov
- INSERM, U1020, CNRS, UMR 8253, Medical Faculty Paris Descartes, Université Paris Descartes Sorbonne Paris Cité, Paris, France
| | - Florence Vasseur
- INSERM, U1020, CNRS, UMR 8253, Medical Faculty Paris Descartes, Université Paris Descartes Sorbonne Paris Cité, Paris, France
| | | | - Benedita Rocha
- INSERM, U1020, CNRS, UMR 8253, Medical Faculty Paris Descartes, Université Paris Descartes Sorbonne Paris Cité, Paris, France
- * E-mail:
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15
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Maynard S, Fang EF, Scheibye-Knudsen M, Croteau DL, Bohr VA. DNA Damage, DNA Repair, Aging, and Neurodegeneration. Cold Spring Harb Perspect Med 2015; 5:cshperspect.a025130. [PMID: 26385091 DOI: 10.1101/cshperspect.a025130] [Citation(s) in RCA: 228] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Aging in mammals is accompanied by a progressive atrophy of tissues and organs, and stochastic damage accumulation to the macromolecules DNA, RNA, proteins, and lipids. The sequence of the human genome represents our genetic blueprint, and accumulating evidence suggests that loss of genomic maintenance may causally contribute to aging. Distinct evidence for a role of imperfect DNA repair in aging is that several premature aging syndromes have underlying genetic DNA repair defects. Accumulation of DNA damage may be particularly prevalent in the central nervous system owing to the low DNA repair capacity in postmitotic brain tissue. It is generally believed that the cumulative effects of the deleterious changes that occur in aging, mostly after the reproductive phase, contribute to species-specific rates of aging. In addition to nuclear DNA damage contributions to aging, there is also abundant evidence for a causative link between mitochondrial DNA damage and the major phenotypes associated with aging. Understanding the mechanistic basis for the association of DNA damage and DNA repair with aging and age-related diseases, such as neurodegeneration, would give insight into contravening age-related diseases and promoting a healthy life span.
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Affiliation(s)
- Scott Maynard
- Department of Cellular and Molecular Medicine, Center for Healthy Aging, University of Copenhagen, DK-2200 Copenhagen, Denmark
| | - Evandro Fei Fang
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224
| | - Morten Scheibye-Knudsen
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224
| | - Deborah L Croteau
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224
| | - Vilhelm A Bohr
- Department of Cellular and Molecular Medicine, Center for Healthy Aging, University of Copenhagen, DK-2200 Copenhagen, Denmark Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224
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Strauss C, Kornowski M, Benvenisty A, Shahar A, Masury H, Ben-Porath I, Ravid T, Arbel-Eden A, Goldberg M. The DNA2 nuclease/helicase is an estrogen-dependent gene mutated in breast and ovarian cancers. Oncotarget 2015; 5:9396-409. [PMID: 25238049 PMCID: PMC4253442 DOI: 10.18632/oncotarget.2414] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Genomic instability, a hallmark of cancer, is commonly caused by failures in the DNA damage response. Here we conducted a bioinformatical screen to reveal DNA damage response genes that are upregulated by estrogen and highly mutated in breast and ovarian cancers. This screen identified 53 estrogen-dependent cancer genes, some of which are novel. Notably, the screen retrieved 9 DNA helicases as well as 5 nucleases. DNA2, which functions as both a helicase and a nuclease and plays a role in DNA repair and replication, was retrieved in the screen. Mutations in DNA2, found in estrogen-dependent cancers, are clustered in the helicase and nuclease domains, suggesting activity impairment. Indeed, we show that mutations found in ovarian cancers impair DNA2 activity. Depletion of DNA2 in cells reduces their tumorogenicity in mice. In human, high expression of DNA2 correlates with poor survival of estrogen receptor-positive patients but not of estrogen receptor-negative patients. We also demonstrate that depletion of DNA2 in cells reduces proliferation, while addition of estrogen restores proliferation. These findings suggest that cells responding to estrogen will proliferate despite being impaired in DNA2 activity, potentially promoting genomic instability and triggering cancer development.
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Affiliation(s)
- Carmit Strauss
- Department of Genetics, Alexander Silberman Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Maya Kornowski
- Department of Genetics, Alexander Silberman Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Avraham Benvenisty
- Department of Genetics, Alexander Silberman Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Amit Shahar
- Department of Developmental Biology and Cancer Research, IMRIC, Hebrew University-Hadassah Medical School, Jerusalem, 91120, Israel
| | - Hadas Masury
- Department of Developmental Biology and Cancer Research, IMRIC, Hebrew University-Hadassah Medical School, Jerusalem, 91120, Israel
| | - Ittai Ben-Porath
- Department of Developmental Biology and Cancer Research, IMRIC, Hebrew University-Hadassah Medical School, Jerusalem, 91120, Israel
| | - Tommer Ravid
- Department of Biochemistry, Alexander Silberman Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Ayelet Arbel-Eden
- Department of Medical Laboratory Sciences, Hadassah Academic College, Jerusalem, 91010, Israel
| | - Michal Goldberg
- Department of Genetics, Alexander Silberman Institute of Life Sciences, Hebrew University of Jerusalem, Jerusalem, 91904, Israel
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He X, Jing Y, Wang J, Li K, Yang Q, Zhao Y, Li R, Ge J, Qiu X, Li G. Significant accumulation of persistent organic pollutants and dysregulation in multiple DNA damage repair pathways in the electronic-waste-exposed populations. ENVIRONMENTAL RESEARCH 2015; 137:458-466. [PMID: 25679774 DOI: 10.1016/j.envres.2014.11.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 11/10/2014] [Accepted: 11/13/2014] [Indexed: 06/04/2023]
Abstract
Electronic waste (e-waste) has created a worldwide environmental and health problem, by generating a diverse group of hazardous compounds such as persistent organic pollutants (POPs). Our previous studies demonstrated that populations from e-waste exposed region have a significantly higher level of chromosomal aberrancy and incidence of DNA damage. In this study, we further demonstrated that various POPs persisted at a significantly higher concentration in the exposed group than those in the unexposed group. The level of reactive oxygen species and micronucleus rate were also significantly elevated in the exposed group. RNA sequencing analysis revealed 31 genes in DNA damage responses and repair pathways that were differentially expressed between the two groups (Log2 ratio >1 or <-1). Our data demonstrated that both females and males of the exposed group have activated a series of DNA damage response genes; however many important DNA repair pathways have been dysregulated. Expressions of NEIL1/3 and RPA3, which are critical in initiating base pair and nucleotide excision repairs respectively, have been downregulated in both females and males of the exposed group. In contrast, expression of RNF8, an E3 ligase involved in an error prone non-homologous end joining repair for DNA double strand break, was upregulated in both genders of the exposed group. The other genes appeared to be differentially expressed only when the males or females of the two groups were compared respectively. Importantly, the expression of cell cycle regulatory gene CDC25A that has been implicated in multiple kinds of malignant transformation was significantly upregulated among the exposed males while downregulated among the exposed females. In conclusion, our studies have demonstrated significant correlations between e-waste disposing and POPs accumulation, DNA lesions and dysregulation of multiple DNA damage repair mechanisms in the residents of the e-waste exposed region.
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Affiliation(s)
- Xiaobo He
- Basic Medical College, Tianjin Medical University, Tianjin 300070, PR China
| | - Yaqing Jing
- Basic Medical College, Tianjin Medical University, Tianjin 300070, PR China
| | - Jianhai Wang
- Basic Medical College, Tianjin Medical University, Tianjin 300070, PR China
| | - Keqiu Li
- Basic Medical College, Tianjin Medical University, Tianjin 300070, PR China
| | - Qiaoyun Yang
- Department of Occupational and Environmental Health, School of Public Health, Tianjin Medical University, Tianjin 300070, PR China
| | - Yuxia Zhao
- Basic Medical College, Tianjin Medical University, Tianjin 300070, PR China
| | - Ran Li
- State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and Center for Environment and Health, Peking University, Beijing 100871, PR China
| | - Jie Ge
- Department of Breast Surgery, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, PR China; Key Laboratory of Breast Cancer Prevention and Treatment of the Ministry of Education, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, PR China
| | - Xinghua Qiu
- State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and Center for Environment and Health, Peking University, Beijing 100871, PR China.
| | - Guang Li
- Basic Medical College, Tianjin Medical University, Tianjin 300070, PR China.
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MicroRNA regulation of DNA repair gene expression in 4-aminobiphenyl-treated HepG2 cells. Toxicology 2014; 322:69-77. [PMID: 24857880 DOI: 10.1016/j.tox.2014.05.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 05/13/2014] [Accepted: 05/13/2014] [Indexed: 11/22/2022]
Abstract
We examined the role of miRNAs in DNA damage response in HepG2 cells following exposure to 4-aminobiphenyl (4-ABP). The arylamine 4-ABP is a human carcinogen. Using the Comet assay, we showed that 4-ABP (18.75-300μM) induces DNA damage in HepG2 cells after 24h. DNA damage signaling pathway-based PCR arrays were used to investigate expression changes in genes involved in DNA damage response. Results showed down-regulation of 16 DNA repair-related genes in 4-ABP-treated cells. Among them, the expression of selected six genes (UNG, LIG1, EXO1, XRCC2, PCNA, and FANCG) from different DNA repair pathways was decreased with quantitative real-time PCR (qRT-PCR). In parallel, using the miRNA array, we reported that the expression of 27 miRNAs in 4-ABP-treated cells was at least 3-fold higher than that in the control group. Of these differential 27 miRNAs, the most significant expression of miRNA-513a-5p and miRNA-630 was further validated by qRT-PCR, and was predicted to be implicated in the deregulation of FANCG and RAD18 genes, respectively, via bioinformatic analysis. Both FANCG and RAD18 proteins were found to be down-regulated in 4-ABP-treated cells. In addition, overexpression and knockdown of miRNA-513a-5p and miRNA-630 reduced and increased the expression of FANCG and RAD18 proteins, respectively. Based on the above results, we indicated that miRNA-513a-5p and miRNA-630 could play a role in the suppression of DNA repair genes, and eventually lead to DNA damage.
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McCauley BS, Dang W. Histone methylation and aging: lessons learned from model systems. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2014; 1839:1454-62. [PMID: 24859460 DOI: 10.1016/j.bbagrm.2014.05.008] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 03/16/2014] [Accepted: 05/13/2014] [Indexed: 01/06/2023]
Abstract
Aging induces myriad cellular and, ultimately, physiological changes that cause a decline in an organism's functional capabilities. Although the aging process and the pathways that regulate it have been extensively studied, only in the last decade have we begun to appreciate that dynamic histone methylation may contribute to this process. In this review, we discuss recent work implicating histone methylation in aging. Loss of certain histone methyltransferases and demethylases changes lifespan in invertebrates, and alterations in histone methylation in aged organisms regulate lifespan and aging phenotypes, including oxidative stress-induced hormesis in yeast, insulin signaling in Caenorhabiditis elegans and mammals, and the senescence-associated secretory phenotype in mammals. In all cases where histone methylation has been shown to impact aging and aging phenotypes, it does so by regulating transcription, suggesting that this is a major mechanism of its action in this context. Histone methylation additionally regulates or is regulated by other cellular pathways that contribute to or combat aging. Given the numerous processes that regulate aging and histone methylation, and are in turn regulated by them, the role of histone methylation in aging is almost certainly underappreciated.
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Affiliation(s)
- Brenna S McCauley
- Huffington Center on Aging, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
| | - Weiwei Dang
- Huffington Center on Aging, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA; Department of Molecular and Human Genetics, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
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