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Chelenkova P, Petkova R, Chamova T, Zhelyazkova S, Tournev I, Chakarov S. The fine art of vascular wall maintenance. Carriership of XPC, TP53and APOEpolymorphisms may be a risk factor for cerebral vascular accidents in the Bulgarian population. BIOTECHNOL BIOTEC EQ 2018. [DOI: 10.1080/13102818.2018.1529542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- Pavlina Chelenkova
- Department of Biochemistry, Faculty of Biology, Sofia University ‘St. Kliment Ohridski’, Sofia, Bulgaria
| | - Rumena Petkova
- Faculty of Medicine, Sofia University ‘St. Kliment Ohridski’, Sofia, Bulgaria
| | - Teodora Chamova
- Clinic of Neurology, Medical University Hospital ‘Alexandrovska’, Medical University of Sofia, Sofia, Bulgaria
| | - Sashka Zhelyazkova
- Clinic of Neurology, Medical University Hospital ‘Alexandrovska’, Medical University of Sofia, Sofia, Bulgaria
| | - Ivaylo Tournev
- Clinic of Neurology, Medical University Hospital ‘Alexandrovska’, Medical University of Sofia, Sofia, Bulgaria
| | - Stoyan Chakarov
- Department of Biochemistry, Faculty of Biology, Sofia University ‘St. Kliment Ohridski’, Sofia, Bulgaria
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Mosse I, Kilchevsky A, Nikolova N, Zhelev N. Some problems and errors in cytogenetic biodosimetry. BIOTECHNOL BIOTEC EQ 2017. [DOI: 10.1080/13102818.2016.1259018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
- Irma Mosse
- National Academy of Sciences, Institute of Genetics and Cytology, Minsk, Belarus
| | - Alexander Kilchevsky
- National Academy of Sciences, Institute of Genetics and Cytology, Minsk, Belarus
| | - Nevena Nikolova
- Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria
| | - Nikolai Zhelev
- Centre for Molecular Cellular Biosensor Research (CMCBR), School of Science, Engineering and Technology, Abertay University, Dundee, Scotland, UK
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Vazharova R, Kremensky I. Individual capacity for DNA repair and maintenance of genomic integrity: a fertile ground for studies in the field of assisted reproduction. BIOTECHNOL BIOTEC EQ 2016. [DOI: 10.1080/13102818.2016.1159923] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Affiliation(s)
- Radoslava Vazharova
- Department of Biology, Medical Genetics and Microbiology, Faculty of Medicine, Sofia University “St. Kliment Ohridski”, Sofia, Bulgaria
| | - Ivo Kremensky
- Center of Molecular Medicine, University Hospital of Obstetrics and Gynaecology “Maichin Dom”, Medical University of Sofia, Sofia, Bulgaria
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Uth K, Sleigh R. Deregulation of the circadian clock constitutes a significant factor in tumorigenesis: a clockwork cancer. Part II. In vivo studies. BIOTECHNOL BIOTEC EQ 2014; 28:379-386. [PMID: 26019524 PMCID: PMC4433803 DOI: 10.1080/13102818.2014.925298] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 04/09/2014] [Indexed: 12/22/2022] Open
Abstract
The uneventful progression through the cell cycle is closely associated with the rhythm set by the circadian clock machinery, with the S-phase of the cell cycle typically occurring at night. Presence of unrepaired DNA damage may reset the phase of the circadian clock, providing opportunities for damage assessment, repair and/or the induction of pro-apoptotic pathways. The core proteins of the circadian clock regulate directly or indirectly a significant number of genes coding for proteins involved in checkpoint transition, cell proliferation and programmed cell death. Disruption of the circadian rhythm may increase the risk for some multifactorial diseases and conditions, including glucose intolerance, cardiovascular disease and various common cancers. In patients with cancer, chronic circadian misalignment may stimulate the growth of tumours and may modify the outcomes of anticancer therapy. Knowledge about the role of physiological rhythms in human disease may contribute to the field of individualized medicine, specifically, in risk assessment and prognostication of the outcomes in patients with multifactorial disease.
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Affiliation(s)
- Kristin Uth
- CMCBR, Abertay University , Dundee , Scotland , UK
| | - Roger Sleigh
- CMCBR, Abertay University , Dundee , Scotland , UK
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Tummala H, Khalil HS, Zhelev N. Repair, Abort, Ignore? Strategies for Dealing With UV Damage. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.5504/bbeq.2011.0079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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DNA Repair and Cell Differentiation—Does Getting Older Means Getting Wiser as Well? BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.2478/v10133-010-0039-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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Khalil HS, Tummala H, Hupp TR, Zhelev N. Pharmacological inhibition of ATM by KU55933 stimulates ATM transcription. Exp Biol Med (Maywood) 2012; 237:622-34. [DOI: 10.1258/ebm.2012.011378] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ataxia-telangiectasia mutated (ATM) kinase is a component of a signalling mechanism that determines the process of decision-making in response to DNA damage and involves the participation of multiple proteins. ATM is activated by DNA double-strand breaks (DSBs) through the Mre11–Rad50–Nbs1 (MRN) DNA repair complex, and orchestrates signalling cascades that initiate the DNA damage response. Cells lacking ATM are hypersensitive to insults, particularly genotoxic stress, induced through radiation or radiomimetic drugs. Here, we investigate the degree of ATM activation during time-dependent treatment with genotoxic agents and the effects of ATM on phospho-induction and localization of its downstream substrates. Additionally, we have demonstrated a new cell-cycle-independent mechanism of ATM gene regulation following ATM kinase inhibition with KU5593. Inhibition of ATM activity causes induction of ATM protein followed by oscillation and this mechanism is governed at the transcriptional level. Furthermore, this autoregulatory induction of ATM is also accompanied by a transient upregulation of p53, pATR and E2F1 levels. Since ATM inhibition is believed to sensitize cancer cells to genotoxic agents, this novel insight into the mechanism of ATM regulation might be useful for designing more precise strategies for modulation of ATM activity in cancer therapy.
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Affiliation(s)
- Hilal S Khalil
- School of Contemporary Sciences, University of Abertay, Kydd Building, 40 Bell street, Dundee DD1 1HG
| | - Hemanth Tummala
- School of Contemporary Sciences, University of Abertay, Kydd Building, 40 Bell street, Dundee DD1 1HG
| | - Tedd R Hupp
- Edinburgh Cancer Research Centre, Western General Hospital, Crewe Road South, Edinburgh EH4 2XR, UK
| | - Nikolai Zhelev
- School of Contemporary Sciences, University of Abertay, Kydd Building, 40 Bell street, Dundee DD1 1HG
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Oluwaseun OA, Khalil HS. War without Weapons—Constitution of Healthy and Pathological Phenotypes Associated with Polymorphisms in Genes Involved in the Maintenance of Genome Integrity. BIOTECHNOL BIOTEC EQ 2012. [DOI: 10.5504/bbeq.2012.0053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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De Caris L, Cecceroni L, Tummala H. On a Break with the X: The Role of Repair of Double-Stranded DNA Breaks in X-Linked Disease. BIOTECHNOL BIOTEC EQ 2012. [DOI: 10.5504/bbeq.2012.0024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Affiliation(s)
- Laura De Caris
- University of Abertay Dundee, School of Contemporary Sciences, Scotland, UK
| | - Lucia Cecceroni
- University of Abertay Dundee, School of Contemporary Sciences, Scotland, UK
| | - Hemanth Tummala
- University of Abertay Dundee, School of Contemporary Sciences, Scotland, UK
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Khalil HS, Petkova R, Zhelev N. Differential Genetic Advantages in Youth and in Aging, or How to Die Healthy. BIOTECHNOL BIOTEC EQ 2012. [DOI: 10.5504/bbeq.2011.0151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Chaudhary P, Shukla SK, Sharma RK. REC-2006-A Fractionated Extract of Podophyllum hexandrum Protects Cellular DNA from Radiation-Induced Damage by Reducing the Initial Damage and Enhancing Its Repair In Vivo. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2011; 2011:473953. [PMID: 20008078 PMCID: PMC3136531 DOI: 10.1093/ecam/nep212] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Accepted: 11/09/2009] [Indexed: 11/13/2022]
Abstract
Podophyllum hexandrum, a perennial herb commonly known as the Himalayan May Apple, is well known in Indian and Chinese traditional systems of medicine. P. hexandrum has been widely used for the treatment of venereal warts, skin infections, bacterial and viral infections, and different cancers of the brain, lung and bladder. This study aimed at elucidating the effect of REC-2006, a bioactive fractionated extract from the rhizome of P. hexandrum, on the kinetics of induction and repair of radiation-induced DNA damage in murine thymocytes in vivo. We evaluated its effect on non-specific radiation-induced DNA damage by the alkaline halo assay in terms of relative nuclear spreading factor (RNSF) and gene-specific radiation-induced DNA damage via semi-quantitative polymerase chain reaction. Whole body exposure of animals with gamma rays (10 Gy) caused a significant amount of DNA damage in thymocytes (RNSF values 17.7 ± 0.47, 12.96 ± 1.64 and 3.3 ± 0.014) and a reduction in the amplification of β-globin gene to 0, 28 and 43% at 0, 15 and 60 min, respectively. Administrating REC-2006 at a radioprotective concentration (15 mg kg−1 body weight) 1 h before irradiation resulted in time-dependent reduction of DNA damage evident as a decrease in RNSF values 6.156 ± 0.576, 1.647 ± 0.534 and 0.496 ± 0.012, and an increase in β-globin gene amplification 36, 95 and 99%, at 0, 15 and 60 min, respectively. REC-2006 scavenged radiation-induced hydroxyl radicals in a dose-dependent manner stabilized DPPH free radicals and also inhibited superoxide anions. Various polyphenols and flavonoides present in REC-2006 might contribute to scavenging of radiation-induced free radicals, thereby preventing DNA damage and stimulating its repair.
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Affiliation(s)
- Pankaj Chaudhary
- Institute of Nuclear Medicine and Allied Sciences (INMAS), Delhi, India
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Chakalova L, Russev G. Transcriptionally active and inactive mouse beta-globin gene loci are repaired at similar rates after ultraviolet irradiation. EUROPEAN JOURNAL OF BIOCHEMISTRY 1999; 261:667-73. [PMID: 10215882 DOI: 10.1046/j.1432-1327.1999.00332.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
It has been demonstrated, by Northern blot and in situ hybridization, that the mouse erythroleukaemia cell line F4N-Sofia constitutively expresses the beta-globin genes. The recently developed quantitative assay for DNA repair has been used to study the overall repair rate in the beta-globin gene domain in this cell line after ultraviolet irradiation and to compare it with the repair rate of the same chromatin domain in mouse Ehrlich ascites tumour cells which do not express the beta-globin genes. The results showed that in both cases the 5'-end of the domain was repaired preferentially and that the repair rates in the two cell lines were very similar despite the different transcription state of the genes.
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Affiliation(s)
- L Chakalova
- Institute of Molecular Biology, Bulgarian Academy of Sciences, Sofia, Bulgaria
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