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Szejk-Arendt M, Czubak-Prowizor K, Macieja A, Poplawski T, Olejnik AK, Pawlaczyk-Graja I, Gancarz R, Zbikowska HM. Polyphenolic-polysaccharide conjugates from medicinal plants of Rosaceae/Asteraceae family protect human lymphocytes but not myeloid leukemia K562 cells against radiation-induced death. Int J Biol Macromol 2020; 156:1445-1454. [DOI: 10.1016/j.ijbiomac.2019.11.186] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 11/14/2019] [Accepted: 11/21/2019] [Indexed: 01/21/2023]
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2
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Mohseni-Salehi FS, Zare-Mirakabad F, Ghafouri-Fard S, Sadeghi M. The effect of stochasticity on repair of DNA double strand breaks throughout non-homologous end joining pathway. MATHEMATICAL MEDICINE AND BIOLOGY-A JOURNAL OF THE IMA 2018; 35:517-539. [PMID: 29237014 DOI: 10.1093/imammb/dqx017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 10/25/2017] [Indexed: 01/01/2023]
Abstract
DNA double strand breaks (DSBs) are the most lethal lesions of DNA induced by ionizing radiation, industrial chemicals and a wide variety of drugs used in chemotherapy. In the context of DNA damage response system modelling, uncertainty may arise in several ways such as number of induced DSBs, kinetic rates and measurement error in observable quantities. Therefore, using the stochastic approaches is imperative to gain further insight into the dynamic behaviour of DSBs repair process. In this article, a continuous-time Markov chain (CTMC) model of the non-homologous end joining (NHEJ) mechanism is formulated according to the DSB complexity. Additionally, a Metropolis Monte Carlo method is used to perform maximum likelihood estimation of the kinetic rate constants. Here, the effects of fluctuating kinetic rates and DSBs induction rate of the NHEJ mechanism are investigated. The stochastic realizations of the total yield of simple and complex DSBs ligation are simulated to compare their asymptotic dynamics. Furthermore, it has been proved that the total yield of DSBs has a normal distribution for sufficiently large number of DSBs. In order to estimate the expected duration of repairing DSBs, the probability distribution of DSBs lifetime is calculated based on the CTMC NHEJ model. Moreover, the variability of total yield of DSBs during constant low-dose radiation is evaluated in the presented model. The findings indicate that in stochastic NHEJ model, when there is no new DSBs induction through the repair process, all DSBs are eventually repaired. However, when DSBs are induced by constant low-dose radiation, a number of DSBs remains un-repaired.
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Affiliation(s)
- Fazeleh S Mohseni-Salehi
- Department of Mathematics and Computer Science, Amirkabir University of Technology, Tehran, Iran
| | - Fatemeh Zare-Mirakabad
- Department of Mathematics and Computer Science, Amirkabir University of Technology, Tehran, Iran.,School of Biological Science, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
| | - Soudeh Ghafouri-Fard
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehdi Sadeghi
- National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
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3
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Gassner FJ, Schubert M, Rebhandl S, Spandl K, Zaborsky N, Catakovic K, Blaimer S, Hebenstreit D, Greil R, Geisberger R. Imprecision and DNA Break Repair Biased towards Incompatible End Joining in Leukemia. Mol Cancer Res 2017; 16:428-438. [PMID: 29222170 DOI: 10.1158/1541-7786.mcr-17-0373] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 09/28/2017] [Accepted: 11/09/2017] [Indexed: 01/14/2023]
Abstract
Cancer is a genetic disease caused by mutations and chromosomal abnormalities that contribute to uncontrolled cell growth. In addition, cancer cells can rapidly respond to conventional and targeted therapies by accumulating novel and often specific genetic lesions leading to acquired drug resistance and relapsing disease. In chronic lymphocytic leukemia (CLL), however, diverse chromosomal aberrations often occur. In many cases, improper repair of DNA double-strand breaks (DSB) is a major source for genomic abnormalities. Therefore, this study examined the repair of DNA DSBs by nonhomologous end joining (NHEJ) in CLL by performing plasmid-based repair assays in primary CLL cells and normal B cells, isolated from patients, as well as TALEN/Cas9-induced chromosomal deletions in the CLL cell line Mec1. It is demonstrated that DNA repair is aberrant in CLL cells, featuring perturbed DNA break structure preference with efficient joining of noncohesive ends and more deletions at repair junctions. In addition, increased microhomology-mediated end joining (MMEJ) of DNA substrates was observed in CLL together with increased expression of MMEJ-specific repair factors. In summary, these data identify major differences in DNA repair efficiency between CLL cells and normal B cells isolated from patients.Implications: This study suggests inherently aberrant DNA DSB repair in the acquisition of subclonal genomic structural variations important for clonal evolution and treatment resistance in CLL. Mol Cancer Res; 16(3); 428-38. ©2017 AACR.
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Affiliation(s)
- Franz Josef Gassner
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Maria Schubert
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Stefan Rebhandl
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Karina Spandl
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Nadja Zaborsky
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Kemal Catakovic
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Stephanie Blaimer
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Daniel Hebenstreit
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - Richard Greil
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg, Austria
| | - Roland Geisberger
- Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectious Disease, Rheumatology, Oncologic Center, Laboratory for Immunological and Molecular Cancer Research, Paracelsus Medical University Salzburg, Austria. .,Cancer Cluster Salzburg, Salzburg, Austria
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Vasconcelos MA, Orsolin PC, Silva-Oliveira RG, Nepomuceno JC, Spanó MA. Assessment of the carcinogenic potential of high intense-sweeteners through the test for detection of epithelial tumor clones (warts) in Drosophila melanogaster. Food Chem Toxicol 2017; 101:1-7. [DOI: 10.1016/j.fct.2016.12.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 12/20/2016] [Accepted: 12/21/2016] [Indexed: 11/26/2022]
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5
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Valenti F, Ganci F, Fontemaggi G, Sacconi A, Strano S, Blandino G, Di Agostino S. Gain of function mutant p53 proteins cooperate with E2F4 to transcriptionally downregulate RAD17 and BRCA1 gene expression. Oncotarget 2016; 6:5547-66. [PMID: 25650659 PMCID: PMC4467386 DOI: 10.18632/oncotarget.2587] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 10/10/2014] [Indexed: 11/25/2022] Open
Abstract
Genomic instability (IN) is a common feature of many human cancers. The TP53 tumour suppressor gene is mutated in approximately half of human cancers. Here, we show that BRCA1 and RAD17 genes, whose derived proteins play a pivotal role in DNA damage repair, are transcriptional targets of gain-of-function mutant p53 proteins. Indeed, high levels of mutp53 protein facilitate DNA damage accumulation and severely impair BRCA1 and RAD17 expression in proliferating cancer cells. The recruitment of mutp53/E2F4 complex onto specific regions of BRCA1 and RAD17 promoters leads to the inhibition of their expression. BRCA1 and RAD17 mRNA expression is reduced in HNSCC patients carrying TP53 mutations when compared to those bearing wt-p53 gene. Furthermore, the analysis of gene expression databases for breast cancer patients reveals that low expression of DNA repair genes correlates significantly with reduced relapse free survival of patients carrying TP53 gene mutations. Collectively, these findings highlight the direct involvement of transcriptionally active gain of function mutant p53 proteins in genomic instability through the impairment of DNA repair mechanisms.
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Affiliation(s)
- Fabio Valenti
- Translational Oncogenomic Unit, Molecular Medicine Area, Regina Elena National Cancer Institute, Rome 00144, Italy
| | - Federica Ganci
- Translational Oncogenomic Unit, Molecular Medicine Area, Regina Elena National Cancer Institute, Rome 00144, Italy
| | - Giulia Fontemaggi
- Translational Oncogenomic Unit, Molecular Medicine Area, Regina Elena National Cancer Institute, Rome 00144, Italy
| | - Andrea Sacconi
- Translational Oncogenomic Unit, Molecular Medicine Area, Regina Elena National Cancer Institute, Rome 00144, Italy
| | - Sabrina Strano
- Molecular Chemoprevention Group, Molecular Medicine Area, Regina Elena National Cancer Institute, Rome 00144, Italy
| | - Giovanni Blandino
- Translational Oncogenomic Unit, Molecular Medicine Area, Regina Elena National Cancer Institute, Rome 00144, Italy
| | - Silvia Di Agostino
- Translational Oncogenomic Unit, Molecular Medicine Area, Regina Elena National Cancer Institute, Rome 00144, Italy
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Rossner P, Rossnerova A, Beskid O, Tabashidze N, Libalova H, Uhlirova K, Topinka J, Sram RJ. Nonhomologous DNA end joining and chromosome aberrations in human embryonic lung fibroblasts treated with environmental pollutants. Mutat Res 2014; 763-764:28-38. [PMID: 24694657 DOI: 10.1016/j.mrfmmm.2014.03.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Revised: 02/25/2014] [Accepted: 03/07/2014] [Indexed: 06/03/2023]
Abstract
In order to evaluate the ability of a representative polycyclic aromatic hydrocarbon (PAH) and PAH-containing complex mixtures to induce double strand DNA breaks (DSBs) and repair of damaged DNA in human embryonic lung fibroblasts (HEL12469 cells), we investigated the effect of benzo[a]pyrene (B[a]P) and extractable organic matter (EOM) from ambient air particles <2.5μm (PM2.5) on nonhomologous DNA end joining (NHEJ) and induction of stable chromosome aberrations (CAs). PM2.5 was collected in winter and summer 2011 in two Czech cities differing in levels and sources of air pollutants. The cells were treated for 24h with the following concentrations of tested chemicals: B[a]P: 1μM, 10μM, 25μM; EOMs: 1μg/ml, 10μg/ml, 25μg/ml. We tested several endpoints representing key steps leading from DSBs to the formation of CAs including histone H2AX phosphorylation, levels of proteins Ku70, Ku80 and XRCC4 participating in NHEJ, in vitro ligation activity of nuclear extracts of the HEL12469 cells and the frequency of stable CAs assessed by whole chromosome painting of chromosomes 1, 2, 4, 5, 7 and 17 using fluorescence in situ hybridization. Our results show that 25μM of B[a]P and most of the tested doses of EOMs induced DSBs as indicated by H2AX phosphorylation. DNA damage was accompanied by induction of XRCC4 expression and an increased frequency of CAs. Translocations most frequently affected chromosome 7. We observed only a weak induction of Ku70/80 expression as well as ligation activity of nuclear extracts. In summary, our data suggest the induction of DSBs and NHEJ after treatment of human embryonic lung fibroblasts with B[a]P and complex mixtures containing PAHs.
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Affiliation(s)
- Pavel Rossner
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic.
| | - Andrea Rossnerova
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic
| | - Olena Beskid
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic
| | - Nana Tabashidze
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic
| | - Helena Libalova
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic
| | - Katerina Uhlirova
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic
| | - Jan Topinka
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic
| | - Radim J Sram
- Department of Genetic Ecotoxicology, Institute of Experimental Medicine AS CR, Prague, Czech Republic
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7
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Rath A, Hromas R, De Benedetti A. Fidelity of end joining in mammalian episomes and the impact of Metnase on joint processing. BMC Mol Biol 2014; 15:6. [PMID: 24655462 PMCID: PMC3998112 DOI: 10.1186/1471-2199-15-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 03/12/2014] [Indexed: 12/13/2022] Open
Abstract
Background Double Stranded Breaks (DSBs) are the most serious form of DNA damage and are repaired via homologous recombination repair (HRR) or non-homologous end joining (NHEJ). NHEJ predominates in mammalian cells at most stages of the cell cycle, and it is viewed as ‘error-prone’, although this notion has not been sufficiently challenged due to shortcomings of many current systems. Multi-copy episomes provide a large pool of genetic material where repair can be studied, as repaired plasmids can be back-cloned into bacteria and characterized for sequence alterations. Here, we used EBV-based episomes carrying 3 resistance marker genes in repair studies where a single DSB is generated with virally-encoded HO endonuclease cleaving rapidly at high efficiency for a brief time post-infection. We employed PCR and Southern blot to follow the kinetics of repair and formation of processing intermediates, and replica plating to screen for plasmids with altered joints resulting in loss of chloramphenicol resistance. Further, we employed this system to study the role of Metnase. Metnase is only found in humans and primates and is a key component of the NHEJ pathway, but its function is not fully characterized in intact cells. Results We found that repair of episomes by end-joining was highly accurate in 293 T cells that lack Metnase. Less than 10% of the rescued plasmids showed deletions. Instead, HEK293 cells (that do express Metnase) or 293 T transfected with Metnase revealed a large number of rescued plasmids with altered repaired joint, typically in the form of large deletions. Moreover, quantitative PCR and Southern blotting revealed less accurately repaired plasmids in Metnase expressing cells. Conclusions Our careful re-examination of fidelity of NHEJ repair in mammalian cells carrying a 3′ cohesive overhang at the ends revealed that the repair is efficient and highly accurate, and predominant over HRR. However, the background of the cells is important in establishing accuracy; with human cells perhaps surprisingly much more prone to generate deletions at the repaired junctions, if/when Metnase is abundantly expressed.
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Affiliation(s)
| | | | - Arrigo De Benedetti
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130, USA.
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A comparative study of the modulatory effects of (−)-cubebin on the mutagenicity/recombinogenicity induced by different chemical agents. Food Chem Toxicol 2013; 55:645-52. [DOI: 10.1016/j.fct.2013.01.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 01/24/2013] [Accepted: 01/25/2013] [Indexed: 12/31/2022]
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9
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Kontek R, Nowicka H. The modulatory effect of melatonin on genotoxicity of irinotecan in healthy human lymphocytes and cancer cells. Drug Chem Toxicol 2012; 36:335-42. [DOI: 10.3109/01480545.2012.737805] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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10
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de Rezende A, e Silva M, Tavares D, Cunha W, Rezende K, Bastos J, Lehmann M, de Andrade H, Guterres Z, Silva L, Spanó M. The effect of the dibenzylbutyrolactolic lignan (−)-cubebin on doxorubicin mutagenicity and recombinogenicity in wing somatic cells of Drosophila melanogaster. Food Chem Toxicol 2011; 49:1235-41. [DOI: 10.1016/j.fct.2011.03.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Revised: 02/27/2011] [Accepted: 03/02/2011] [Indexed: 11/28/2022]
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