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Depuydt J, Baeyens A, Barnard S, Beinke C, Benedek A, Beukes P, Buraczewska I, Darroudi F, De Sanctis S, Dominguez I, Monteiro Gil O, Hadjidekova V, Kis E, Kulka U, Lista F, Lumniczky K, M’kacher R, Moquet J, Obreja D, Oestreicher U, Pajic J, Pastor N, Popova L, Regalbuto E, Ricoul M, Sabatier L, Slabbert J, Sommer S, Testa A, Thierens H, Wojcik A, Vral A. O42. Realizing the European Network of Biological Dosimetry ‘RENEB’: Results of 2 intercomparison exercises for the micronucleus assay. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.07.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Depuydt J, Baeyens A, Barnard S, Beinke C, Benedek A, Beukes P, Buraczewska I, Darroudi F, De Sanctis S, Dominguez I, Monteiro Gil O, Hadjidekova V, Kis E, Kulka U, Lista F, Lumniczky K, M’kacher R, Moquet J, Obreja D, Oestreicher U, Pajic J, Pastor N, Popova L, Regalbuto E, Ricoul M, Sabatier L, Slabbert J, Sommer S, Testa A, Thierens H, Wojcik A, Vral A. RENEB intercomparison exercises analyzing micronuclei (Cytokinesis-block Micronucleus Assay). Int J Radiat Biol 2016; 93:36-47. [DOI: 10.1080/09553002.2016.1206231] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Julie Depuydt
- Faculty of Medicine and Health Sciences, Ghent University, Gent, Belgium
| | - Ans Baeyens
- National Research Foundation (NRF) iThemba LABS, Somerset West, South Africa
| | - Stephen Barnard
- Public Health England, Centre for Radiation Chemical and Environmental Hazards, Chilton, UK
| | - Christina Beinke
- Bundeswehr Institut für Radiobiology, Universität Ulm, Munich, Germany
| | - Anett Benedek
- National Public Health Centre – National Research Directorate for Radiobiology and Radiohygiene, Budapest, Hungary
| | - Philip Beukes
- National Research Foundation (NRF) iThemba LABS, Somerset West, South Africa
| | | | | | | | | | - Octávia Monteiro Gil
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Bobadela-LRS, Portugal
| | | | - Enikő Kis
- National Public Health Centre – National Research Directorate for Radiobiology and Radiohygiene, Budapest, Hungary
| | - Ulrike Kulka
- Bundesamt für Strahlenschutz, Department Radiation Protection and Health, Oberschleissheim, Germany
| | - Florigio Lista
- Army Medical and Veterinary Research Center, Rome, Italy
| | - Katalin Lumniczky
- National Public Health Centre – National Research Directorate for Radiobiology and Radiohygiene, Budapest, Hungary
| | - Radhia M’kacher
- Laboratoire de Radiobiologie et Oncologie, Commissariat à l’Energy Atomique, France
| | - Jayne Moquet
- Public Health England, Centre for Radiation Chemical and Environmental Hazards, Chilton, UK
| | - Doina Obreja
- Institutul National de Sanatate Publica, Bucuresti, Romania
| | - Ursula Oestreicher
- Faculty of Medicine and Health Sciences, Ghent University, Gent, Belgium
| | - Jelena Pajic
- Serbian Institute of Occupational Health “Dr Dragomir Karajovic”, Radiation Protection Center, Belgrado, Serbia
| | | | - Ljubomira Popova
- National Center for Radiobiology and Radiation Protection, Sofia, Bulgaria
| | | | - Michelle Ricoul
- Laboratoire de Radiobiologie et Oncologie, Commissariat à l’Energy Atomique, France
| | - Laure Sabatier
- Laboratoire de Radiobiologie et Oncologie, Commissariat à l’Energy Atomique, France
| | - Jacobus Slabbert
- National Research Foundation (NRF) iThemba LABS, Somerset West, South Africa
| | | | - Antonella Testa
- Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile, Rome, Italy
| | - Hubert Thierens
- Faculty of Medicine and Health Sciences, Ghent University, Gent, Belgium
| | - Andrzej Wojcik
- Institute Molecular Biosciences, Stockholm University, Stockholm, Sweden
| | - Anne Vral
- Faculty of Medicine and Health Sciences, Ghent University, Gent, Belgium
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Shelest E, Popova L, Matveeva M, Patrushev L, Shuganov A, Gneusheva T, Bokarev I. C0598: Thrombophilia Influence on the Intensity of the Intravascular Microcoagulation at the Patients with Atherothrombosis and Chronic Obstructive Pulmonary Disease. Thromb Res 2014. [DOI: 10.1016/s0049-3848(14)50182-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Georgiev G, Ivanova A, Mechkarova P, Ivanova A, Popova L. Rate and forms of Mineral Nutrition CAN Influence Dry Matter Accumulation and Saponin Content of Puncture Vine(Tribulus TerrestrisL.). BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2010.10817810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Yordanova R, Maslenkova L, Paunova S, Popova L. Sensitivity of Photosynthetic Apparatus of Pea Plants to Heavy Metal Stress. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2009.10818436] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Milenkova M, Milanov I, Kmetska K, Deleva S, Popova L, Hadjidekova V, Groudeva V, Hadjidekova S, Domínguez I. Chromosomal radiosensitivity in patients with multiple sclerosis. Mutat Res 2013; 749:3-8. [PMID: 23994714 DOI: 10.1016/j.mrfmmm.2013.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 07/06/2013] [Accepted: 08/16/2013] [Indexed: 06/02/2023]
Abstract
Multiple sclerosis is a clinically heterogeneous autoimmune disease leading to severe neurological disability. Although during the last years many disease-modifying agents as treatment options for multiple sclerosis have been made available, their mechanisms of action are still not fully determined. In the present study radiosensitivity in lymphocytes of patients with relapsing-remitting multiple sclerosis, secondary progressive multiple sclerosis and healthy controls was investigated. Whole blood cultures from multiple sclerosis patients and healthy controls were used to analyze the spontaneous and radiation-induced micronuclei in binucleated lymphocytes. A subgroup of patients with relapsing-remitting multiple sclerosis was treated with immunomodulatory agents, interferon β or glatiramer acetate. The secondary progressive multiple sclerosis patients group was not receiving any treatment. Our results reveal that the basal DNA damage was not different between relapsing-remitting and secondary progressive multiple sclerosis patients, and healthy controls. No differences between gamma-irradiation induced micronuclei frequencies in binucleated cells from relapsing-remitting and secondary progressive multiple sclerosis patients, and healthy controls were found either. Nevertheless, when we compared the radiation induced DNA damage in binucleated cells from healthy individuals with the whole group of patients, a reduction in the frequency of micronuclei was obtained in the patients group. Induced micronuclei yield was significantly lower in the irradiated samples from treated relapsing-remitting multiple sclerosis patients than in healthy controls and relapsing-remitting not treated patients. Intrinsic sensitivity of lymphocytes subpopulations to the apoptotic effect of immunomodulatory treatment could be responsible for this result.
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Affiliation(s)
- Maria Milenkova
- III Neurological Clinic, University Hospital Saint Naum, Sofia, Bulgaria
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Hristova R, Hadjidekova V, Grigorova M, Nikolova T, Bulanova M, Popova L, Staynova A, Benova D. Chromosome analysis of nuclear power plant workers using fluorescence in situ hybridization and Giemsa assay. J Radiat Res 2013; 54:832-9. [PMID: 23536543 PMCID: PMC3766290 DOI: 10.1093/jrr/rrt018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The aim of this study was to evaluate the genotoxic effects of ionizing radiation in vivo in exposed Bulgarian nuclear power plant workers by using classical cytogenetic and molecular cytogenetic analyses of peripheral lymphocytes. Chromosome analysis using fluorescence in situ hybrydization (FISH) and Giemsa techniques was undertaken on 63 workers and 45 administrative staff controls from the Bulgarian Nuclear Power Plant. Using the Giemsa method, the frequencies of cells studied with chromosome aberrations, dicentrics plus rings and chromosome fragments in the radiation workers were significantly higher compared with the control group (P = 0.044, P = 0.014, and P = 0.033, respectively). A significant association between frequencies of dicentrics plus rings and accumulated doses was registered (P < 0.01). In the present study, a FISH cocktail of whole chromosome paints for chromosomes 1, 4 and 11 was used. A significant association between frequency of translocations and accumulated doses was also observed (P < 0.001). Within the control group, a correlation was found between age and the spontaneous frequency of translocations. No correlation was found between smoking status and frequency of translocations. When compared with the control group, workers with accumulated doses up to 100 mSv showed no increase in genome translocation frequency, whereas workers with accumulated doses from 101 to 200 mSv showed a statistically significant doubling of genome translocation frequency (P = 0.009). Thus, in cases of chronic exposure and for purposes of retrospective dosimetry, the genome frequency of translocations is a more useful marker for evaluation of genotoxic effects than dicentric frequency.
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Affiliation(s)
- Rositsa Hristova
- Corresponding author. Department of Radiation Genetics, National Centre of Radiobiology and Radiation Protection, 3 Sv. Georgi Sofiiski Blvd, 1606 Sofia, Bulgaria. Tel: +359-887-613-818; Fax: +359-28621059;
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Russino A, Ascrizzi A, Popova L, Tonazzini A, Mancuso S, Mazzolai B. A novel tracking tool for the analysis of plant-root tip movements. Bioinspir Biomim 2013; 8:025004. [PMID: 23648942 DOI: 10.1088/1748-3182/8/2/025004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The growth process of roots consists of many activities, such as exploring the soil volume, mining minerals, avoiding obstacles and taking up water to fulfil the plant's primary functions, that are performed differently, depending on environmental conditions. Root movements are strictly related to a root decision strategy, which helps plants to survive under stressful conditions by optimizing energy consumption. In this work, we present a novel image-analysis tool to study the kinematics of the root tip (apex), named analyser for root tip tracks (ARTT). The software implementation combines a segmentation algorithm with additional software imaging filters in order to realize a 2D tip detection. The resulting paths, or tracks, arise from the sampled tip positions through the acquired images during the growth. ARTT allows work with no markers and deals autonomously with new emerging root tips, as well as handling a massive number of data relying on minimum user interaction. Consequently, ARTT can be used for a wide range of applications and for the study of kinematics in different plant species. In particular, the study of the root growth and behaviour could lead to the definition of novel principles for the penetration and/or control paradigms for soil exploration and monitoring tasks. The software capabilities were demonstrated by experimental trials performed with Zea mays and Oryza sativa.
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Affiliation(s)
- A Russino
- The BioRobotics Institute, Scuola Superiore Sant'Anna SSSA, I-56025 Pontedera, PI, Italy
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Hadjidekova V, Hristova R, Ainsbury EA, Atanasova P, Popova L, Staynova A. The use of the dicentric assay for biological dosimetry for radiation accidents in Bulgaria. Health Phys 2010; 98:252-257. [PMID: 20065690 DOI: 10.1097/hp.0b013e3181ab3ccf] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This paper details the construction of a 137Cs gamma calibration curve that has been established for dicentric assay and the testing and validation of the curve through biological dosimetry in three situations of suspected workplace overexposure that arose accidentally or through negligence or lack of appropriate safety measures. The three situations were: (1) suspected 137Cs contamination in a factory air supply; (2) suspected exposure to an industrial 192Ir source; and (3) accidental exposure of construction workers to radiation from a 60Co radiotherapy source in a hospital medical physics department. From a total of 24 potentially-exposed subjects, only one worker was found to have a statistically significant dose (0.16 Gy, 95% confidence intervals 0.02-0.43 Gy). In all other cases, the main function of the biological dosimetry was to reassure the subjects that any dose received was low.
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Affiliation(s)
- Valeria Hadjidekova
- Laboratory of Radiation Genetics, National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria.
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De Groot NMS, Atary JZ, Blom NA, Van Kuijk JP, Schalij MJ, Tomaske M, Candinas R, Weiss M, Bauersfeld U, Fassa AA, Ashrafpoor G, Sunthorn H, Burri H, Gentil-Baron P, Shah D, Wijnmaalen AP, Delgado V, Schalij MJ, Holman ER, Bax JJ, Zeppenfeld K, Kuhne M, Oral H, Morady F, Bogun F, Schwagten B, Szili-Torok T, Knops P, Kimman G, Thornton A, Jordaens L, Satomi K, Roland T, Kamakura S, Kuck K, Ouyang F, Nowak S, Wnuk-Wojnar AM, Hoffmann A, Czerwinski C, Szydlo K, Rybicka-Musialik A, Wozniak-Skowerska I, Trusz-Gluza M, Krynski T, Stec SM, Stec SM, Hachiya H, Hirao K, Sasaki T, Higuchi K, Isobe M, Etsadashvili K, Hintringer F, Stuehlinger X, Berger T, Dichtl W, Roithinger FX, Pachinger O, Stuehlinger M, Tanno K, Onuki T, Minoura Y, Kawamura M, Asano T, Kobayashi Y, Bonet A, Merce Klein J, De Castro R, Valdovinos P, Colomer I, Garcia MI, Serrano I, Bardaji A, Peichl P, Cihak R, Polasek R, Kucera P, Bytesnik J, Kautzner J, Schlueter S, Grebe O, Vester EV, Maury P, Fourcade J, Duparc A, Hebrard A, Mondoly P, Rollin A, Rumeau P, Delay M, De Boeck BWL, Teske AJ, Mohamed Hoesein FAA, Van Driel VJH, Loh P, Cramer MJM, Prinzen FW, Doevendans PAF, Pokushalov E, Romanov A, Turov A, Shugaev P, Artemenko S, Shirokova N, Richter B, Gwechenberger M, Socas A, Zorn G, Albinni S, Wojta J, Binder T, Goessinger H, Kettering K, Mollnau H, Gramley F, Weiss C, Berkowitsch A, Neumann T, Kuniss M, Zaltsberg S, Wojcik M, Pitschner HF, Wichterle D, Peca M, Bulkova V, Cihak R, Peichl P, Kautzner J, Suzuki A, Yamauchi Y, Okada H, Obayashi T, Sekiguchi Y, Aonuma K, Isobe M, Pokushalov E, Romanov A, Turov A, Shugaev P, Artemenko S, Shirokova N, Zoppo F, Bertaglia E, Zerbo F, Brandolino G, Bacchiega E, Lickfett L, Bellmann B, Linhart M, Schrickel JW, Lewalter T, Schwab JO, Nickenig G, Mittmann-Braun EL, Dabrowski P, Kozluk E, Stefanczyk P, Kleinrok A, Opolski G, Andronache M, Abdelaal A, Magnin-Poull I, Cedano J, Groben L, Mandry D, Aliot E, De Chillou C, Mulder AAW, Wijffels MCEF, Wever EFD, Boersma LVA, Manfai B, Faludi R, Fodi E, Rausch P, Simor T, Sciarra L, Rebecchi M, De Ruvo E, De Luca L, Zuccaro LM, Fagagnini A, Delise P, Calo L, Mikhaylov E, Van Belle Y, Janse P, Lebedev D, Kanidieva A, Jordaens L, Szili-Torok T, Patel D, Shaheen M, Sonne K, Mohanty P, Di-Biase L, Popova L, Burkhardt D, Natale A, Mccann CJ, Gal B, Goethals P, Peychev P, Geelen P, Vatasescu RG, Iorgulescu C, Ieremciuc I, Alexandru R, Dorobantu M, Insulander P, Bastani H, Braunschweig F, Jensen-Urstad M, Schwieler J, Tabrizi F, Kenneback G, Foldesi CSABA, Kardos A, Mihalcz A, Abraham PAL, Som ZOLTAN, Borbola JOZSEF, Vanyi JOZSEF, Szili-Torok TAMAS, Pastor Fuentes A, Nunez A, Tur N, Berzal B, G Cosio F, Mujovic N, Grujic M, Mrdja S, Kocijancic A, Potpara T, Polovina M, Vujisic-Tesic B, Petrovic M, Hayashi T, Hachiya H, Hirao K, Higuchi K, Sasaki T, Furukawa T, Kawabata M, Isobe M, Lavalle C, Ficili S, Galeazzi M, Russo M, Pandozi A, Pandozi C, Venditti F, Santini M, Wichterle D, Pavlikova K, Psenicka M, Anger Z, Linhart A, Sonne K, Narten A, Gamelin A, Mittag J, Patel D, Raffa S, Geller JC, Mocini D, Russo M, Venditti F, Ficili S, Galeazzi M, Lavalle C, Pandozi C, Santini M, Groenveld HF, Rienstra M, Van Den Berg MP, Hillege HL, Van Veldhuisen DJ, Van Gelder IC, Morani G, Manica A, Angheben C, Cicoira MA, Pozzani L, Tomasi L, Zanotto G, Vassanelli C, Ahmed S, Ranchor AV, Rienstra M, Wiesfeld ACP, Van Veldhuisen DJ, Van Gelder IC. Poster Session 1: Ablation of SVT and VT. Europace 2009. [DOI: 10.1093/europace/euq212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Popova L, Kishkilova D, Hadjidekova VB, Hristova RP, Atanasova P, Hadjidekova VV, Ziya D, Hadjidekov VG. Micronucleus test in buccal epithelium cells from patients subjected to panoramic radiography. Dentomaxillofac Radiol 2007; 36:168-71. [PMID: 17463102 DOI: 10.1259/dmfr/29193561] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES To evaluate the possible genotoxic effect of radiation exposure for dental diagnostic purposes as measured by the formation of micronuclei. METHODS The micronucleus test was applied to buccal epithelium cells, which are target cells for dental radiography. Specimens of exfoliated buccal cells were collected from patients subjected to panoramic radiography. Samples were obtained from 32 patients, 12 male and 20 female, aged from 24 years to 73 years, before and 10+/-2 days after panoramic radiation exposure. RESULTS No significant increase in the frequency of cells with micronuclei and total number of micronuclei after panoramic tomography was detected. Mean values of buccal cells with micronuclei+/-standard deviation (SD) before and after radiation examination were 2.34+/-1.49% and 2.81+/-1.64%, respectively. A significant correlation between the age of investigated subjects and the initial frequency of micronuclei in buccal cells was observed (r=0.60, P<0.01). CONCLUSION Panoramic radiographic examination does not induce micronuclei in target buccal epithelium cells.
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Affiliation(s)
- L Popova
- Laboratory Radiation Genetics, National Centre of Radiobiology and Radiation Protection, Sofia 1756, Bulgaria
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Gu TL, Popova L, Reeves C, Nardone J, Macneill J, Rush J, Nimer SD, Polakiewicz RD. Phosphoproteomic analysis identifies the M0-91 cell line as a cellular model for the study of TEL-TRKC fusion-associated leukemia. Leukemia 2007; 21:563-6. [PMID: 17252008 DOI: 10.1038/sj.leu.2404555] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
MESH Headings
- Acute Disease
- Biomarkers, Tumor/analysis
- Biomarkers, Tumor/genetics
- Cell Line, Tumor/chemistry
- Chromosomes, Human, Pair 12/genetics
- Chromosomes, Human, Pair 12/ultrastructure
- Chromosomes, Human, Pair 15/genetics
- Chromosomes, Human, Pair 15/ultrastructure
- Humans
- Leukemia, Myeloid/genetics
- Leukemia, Myeloid/pathology
- Neoplasm Proteins/metabolism
- Oncogene Proteins, Fusion/analysis
- Oncogene Proteins, Fusion/genetics
- Phosphorylation
- Phosphotyrosine/analysis
- Protein Processing, Post-Translational
- Protein Structure, Tertiary
- Protein-Tyrosine Kinases/metabolism
- RNA, Small Interfering/pharmacology
- STAT5 Transcription Factor/metabolism
- Translocation, Genetic
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Kamberov G, Popova L, Marinov P, Hristov V. Correlations of ELM Frequency with Pedestal Plasma Properties. Fusion Science and Technology 2005. [DOI: 10.13182/fst05-a785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- G. Kamberov
- Stevens Institute of Technology, Hoboken NJ, USA
| | - L. Popova
- Institute of Mathematics and Informatics, Bulg. Acad. of Sci., Sofia, Bulgaria
| | - P. Marinov
- Institute for Parallel Processing, Bulg. Acad. of Sci., Sofia, Bulgaria
| | - V. Hristov
- Institute of Mathematics and Informatics, Bulg. Acad. of Sci., Sofia, Bulgaria
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Popova L, Hadjidekova V, Hadjieva T, Agova S, Vasilev I. Cytokinesis-block micronucleus test in patients undergoing radioiodine therapy for differentiated thyroid carcinoma. Hell J Nucl Med 2005; 8:54-7. [PMID: 15886755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/25/2005] [Accepted: 04/21/2005] [Indexed: 05/02/2023]
Abstract
Cytokinesis-blocked micronucleus assay (MNT) was applied in the peripheral blood lymphocytes of patients undergoing radioiodine-131 ((131)I) therapy for differentiated thyroid carcinoma (DTC) after thyroidectomy to assess the genotoxic risk of this therapy. The amount of administered (131)I activity varied from 3,330 to 4,030 MBq. Blood samples were taken immediately before (131)I administration and one month later, along with routine blood tests. Twenty-six patients underwent radioiodine ablation (RIA) or radioiodine therapy (RIT) after radical thyroidectomy. The aim of this therapy was to ablate residual thyroid tissue, to treat lymph node metastases and/or distant lung metastases. The amount of orally administered activity of (131)I ranged between 3,330 and 4,030 MBq according to the kind of therapy (RIA or RIT). In five patients the cytogenetic analysis was performed immediately before and one month after the second therapy which was given to them 6 months to 1 year after the first. Three patients were male and 23 female. The age of the patients ranged between 23 and 76 years (mean age: 48.6 years). Results show that after radioiodine therapy there is a significant increase in the frequency of micronuclei. Comparing the average frequency of micronuclei in the patients studied before and after (131)I, a more than doubling increase was found. Mean values +/- SD of the patients before and after (131)I therapy were 10.72 per thousand +/- 5.84 per thousandand 25.28 per thousand +/- 12.6 per thousand respectively. These findings indicate a genotoxic activity of (131)I therapy estimated after a period of one month.
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Affiliation(s)
- Ljubomira Popova
- National Center of Radiobiology and Radiation Protection, 132, Kl. Ochridski blvd., Sofia 1756, Bulgaria
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Puzyr AP, Mogil'naya OA, Krylova T, Popova L. Abnormal structure of the Bacillus subtilis bacterial colonies. DOKL BIOCHEM BIOPHYS 2001; 378:170-2. [PMID: 11712171 DOI: 10.1023/a:1011548826258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A P Puzyr
- Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia
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Kurt-Jones EA, Popova L, Kwinn L, Haynes LM, Jones LP, Tripp RA, Walsh EE, Freeman MW, Golenbock DT, Anderson LJ, Finberg RW. Pattern recognition receptors TLR4 and CD14 mediate response to respiratory syncytial virus. Nat Immunol 2000; 1:398-401. [PMID: 11062499 DOI: 10.1038/80833] [Citation(s) in RCA: 1168] [Impact Index Per Article: 48.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The innate immune system contributes to the earliest phase of the host defense against foreign organisms and has both soluble and cellular pattern recognition receptors for microbial products. Two important members of this receptor group, CD14 and the Toll-like receptor (TLR) pattern recognition receptors, are essential for the innate immune response to components of Gram-negative and Gram-positive bacteria, mycobacteria, spirochetes and yeast. We now find that these receptors function in an antiviral response as well. The innate immune response to the fusion protein of an important respiratory pathogen of humans, respiratory syncytial virus (RSV), was mediated by TLR4 and CD14. RSV persisted longer in the lungs of infected TLR4-deficient mice compared to normal mice. Thus, a common receptor activation pathway can initiate innate immune responses to both bacterial and viral pathogens.
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Affiliation(s)
- E A Kurt-Jones
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.
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Koeva Y, Davidoff M, Popova L. Immunocytochemical expression of p75LNGFR and trkA in Leydig cells of the human testis. Folia Med (Plovdiv) 2000; 41:53-8. [PMID: 10786205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
The authors demonstrate for the first time the immunocytochemical expression of the low-affinity neurotrophic growth factor (NGF) receptor p75LNGFR and the high-affinity NGF receptor trkA in the human testis. Employing the polyclonal anti-p75LNGFR antibody and the polyclonal anti-trkA antibody they report strong immunoreactivity for those antigens in the interstitial Leydig cells. Sertoli cells and some cellular elements of the germinative epithelium were also trkA-positive. These findings implicate the neurotrophic factor NGF and its receptors p75LNGFR and trkA in the autocrine and paracrine regulation of the steroidogenic activity of Leydig cells of the human testis.
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Affiliation(s)
- Y Koeva
- Histology and Embryology Department, Higher Medical Institute, Plovdiv, Bulgaria
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Sivkova N, Steuhl KP, Rohrbach J, Popova L. Effect of dacarbazine (DTIC) on cultures from malignant melanoma of the choroid: an immunohistochemical and electron microscopic study. Folia Med (Plovdiv) 2000; 41:5-11. [PMID: 10658360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
INTRODUCTION Dacarbazine (DTIC) is a very effective chemotherapeutic agent used in the treatment of cutaneous melanoma; it also could have a potential therapeutic value as an antimetastatic agent in the treatment of choroidal melanoma. OBJECTIVE To study the HMB-45 and S100 protein expression in choroidal melanoma cultures with and without DTIC, and compare the immunohistochemical and electron microscopic changes in both groups. METHODS Five- and seven-day cultures of choroidal melanoma (n = 21) were cultivated in diffusion chambers. The cultures were divided in two groups: I group (control group)--the cells were grown in 199-medium; II group--the cells were in 199-medium supplemented with 0.03 mg/ml of DTIC. Immunohistochemical studies were performed with paraffin-embedded material of the cultures by the avidin-biotin-alkaline phosphatase technique. Araldit-embedded material was studied by electron microscopy. RESULTS The expression of HMB-45 and S100 protein in the cultures with DTIC ranged from slightly positive to negative. The tumor cells were severely damaged. Electron microscopy in this group showed presence only of cellular fragments. In the DTIC-free group the HMB-45 and S100 expressions were strongly positive. There were no electron microscopic evidence of cellular death. CONCLUSION DTIC suppresses the growth of choroidal melanoma in vitro. These results indicate that further studies are warranted to elucidate the effect of DTIC in vivo.
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Affiliation(s)
- N Sivkova
- Department of Ophthalmology, Higher Medical Institute, Plovdiv, Bulgaria
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Abstract
In this study, the immunocytochemical expression of leptin in the developing subcutaneous tissue of human embryos at 6-10 weeks of gestation was investigated using the avidin-biotin peroxidase method. Immunocytochemical staining for leptin was observed in the cytoplasm of the differentiating preadipose cells. The other cells present in the embryonal subcutis (mesenchymal cells differentiating into fibroblasts, fibrocytes, endothelial cells) were leptin-negative. The developing skin epithelium lying above it and the blood cells in the capillaries also did not express leptin. The results suggest that the leptin is produced by the developing fat cells from the beginning of lipidogenesis and differentiation. It possibly acts as a hormonal factor regulating the embryonal growth, development and body fat storage.
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Affiliation(s)
- P Atanassova
- Department of Histology and Embryology, Higher Medical Institute, Plovdiv, Bulgaria
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Popova L, Balnokin Y, Dietz KJ, Gimmler H. Na+-ATPase from the plasma membrane of the marine alga Tetraselmis (Platymonas) viridis forms a phosphorylated intermediate. FEBS Lett 1998; 426:161-4. [PMID: 9598999 DOI: 10.1016/s0014-5793(98)00314-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Plasma membranes isolated from the marine unicellular alga Tetraselmis (Platymonas) viridis were phosphorylated by [gamma-32P]ATP, and membrane proteins were then analyzed by PAGE in SDS, under acidic conditions. Three radioactive components with apparent molecular masses of 100 kDa, 76 kDa, and 26 kDa were detected. The phosphorylation of one of them, the 100 kDa polypeptide, was specifically stimulated by Na+. Vanadate almost completely inhibited the Na+-mediated phosphorylation of the peptide. The phosphate bound to this peptide underwent rapid turnover and was discharged by hydroxylamine. The 100 kDa phosphopeptide was sensitive to ADP. The conclusion is drawn that the 100 kDa phosphopeptide is a phosphorylated intermediate of the Na+-transporting ATPase in the T. viridis plasma membrane.
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Affiliation(s)
- L Popova
- Institute of Plant Physiology, Russian Academy of Sciences, Moscow
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Zinkevich V, Popova L, Kryukov V, Abadjieva A, Bogdarina I, Janscak P, Firman K. The HsdR subunit of R.EcoR124II: cloning and over-expression of the gene and unexpected properties of the subunit. Nucleic Acids Res 1997; 25:503-11. [PMID: 9016588 PMCID: PMC146478 DOI: 10.1093/nar/25.3.503] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Type I restriction endonucleases are composed of three subunits, HsdR, HsdM and HsdS. The HsdR subunit is absolutely required for restriction activity; while an independent methylase is composed of HsdM and HsdS subunits. DNA cleavage is associated with a powerful ATPase activity during which DNA is translocated by the enzyme prior to cleavage. The presence of a Walker type I ATP-binding site within the HsdR subunit suggested that the subunit may be capable of independent enzymatic activity. Therefore, we have, for the first time, cloned and over-expressed the hsdRgene of the type IC restriction endonuclease EcoR124II. The purified HsdR subunit was found to be a soluble monomeric protein capable of DNA- and Mg2+-dependent ATP hydrolysis. The subunit was found to have a weak nuclease activity both in vivo and in vitro, and to bind plasmid DNA; although was not capable of binding a DNA oligoduplex. We were also able to reconstitute the fully active endonuclease from purified M. EcoR124I and HsdR. This is the first clear demonstration that the HsdR subunit of a type I restriction endonuclease is capable of independent enzyme activity, and suggests a mechanism for the evolution of the endonuclease from the independent methylase.
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Affiliation(s)
- V Zinkevich
- Biophysics Laboratories, School of Biological Sciences, University of Portsmouth, St Michael's Building, White Swan Road, Portsmouth PO1 2DT, UK
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Abstract
The aim of this study was to determine the inhibitory effect of clinically usable proteinase inhibitors p-aminomethylbenzoic acid (PAMBA), and aprotinin on acantholysis in skin organ culture and in clinical trials with pemphigus patients. PAMBA added to the culture medium at a concentration of 1 mg/ml fully prevented the acantholysis, while Contrykal at 10 ATrE/ml reduced acantholysis. Subsequently, we treated 12 patients (groups 1) with PAMBA 100-200 mg daily for 7 to 26 days in combination with a moderate dose of corticosteroid (mean dose 36.1 mg prednisolone equivalent) or immunosuppressive drugs. A second group of 12 patients (group 2) were treated with a high dose of corticosteroid (mean 94.2 mg prednisolone equivalent) and immunosuppressive drugs. Evaluation was performed before treatment, after 3 weeks and on discharge using a clinical scoring system. The inclusion of PAMBA in the treatment protocol of group 1 resulted in active disease being brought under control with lower corticosteroid doses. As a result, fewer side effects were observed in group 1 than in group 2. In our opinion, protease inhibitors may be useful as adjuvant drugs in the combination therapy of pemphigus.
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Affiliation(s)
- H Dobrev
- Department of Dermatology, Medical University, Plovdiv, Bulgaria
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Kostadinova I, Genova V, Popova L, Udvareva N, Kovacheva S. [Thrombokinetic study of patients with idiopathic thrombocytopenic purpura]. Gematol Transfuziol 1989; 34:39-41. [PMID: 2515094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The kinetics of 111In-oxine-labeled platelets was studied in 37 patients with idiopathic thrombocytopenic purpura and in 12 control subjects using gamma-chamber. A comparison was made of the parameters of the kinetics, survival and sequestration type of platelets, as well as their recovery and exchange. In less severe processes the splenic type, while in more severe disease--the hepatic type of sequestration prevailed.
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Abstract
A 16-year-old girl initially had an eruption consisting of dark gray, flat, pin-sized, confluent papules with a slight hyperkeratotic surface. The lesions appeared after her summer holidays and were restricted to the tanned skin of sun-exposed areas, mainly the abdomen and back. Clinical and histologic findings were consistent with confluent and reticulated papillomatosis. If a basic disorder of keratinization is the cause of confluent and reticulated papillomatosis, it seems likely that the development of the disease in our patient may be due to an abnormal epidermal response to ultraviolet light.
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Affiliation(s)
- S Vassileva
- Institute of Dermatovenerology, Medical Academy, Sofia, Bulgaria
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Tsankov N, Botev-Zlatkov N, Lazarova AZ, Kostova M, Popova L, Tonev S. Psoriasis and drugs: influence of tetracyclines on the course of psoriasis. J Am Acad Dermatol 1988; 19:629-32. [PMID: 3183091 DOI: 10.1016/s0190-9622(88)70216-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Patients with psoriasis vulgaris (462) were studied by questionnaire to find the effect on psoriasis of drug therapy for intercurrent diseases or focal infections. Of 462 patients with psoriasis, in 76 (16.45%) the disease became more severe during drug therapy. Of these, 19 worsened after administration of tetracyclines, and in five psoriasis was precipitated after therapy with drugs of the tetracycline family. We suggest that tetracyclines should be avoided in patients with psoriasis and in healthy persons with a genetic predisposition (positive family history, human leukocyte antigens B13, B17, B27).
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Affiliation(s)
- N Tsankov
- Scientific Institute of Dermatology and Venereology, Medical Academy, Sofia, Bulgaria
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