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Minkina T, Fedorenko G, Nevidomskaya D, Fedorenko A, Sushkova S, Mandzhieva S, Chaplygin V, Litvinov Y, Ghazaryan K, Movsesyan H, Popov Y, Rensing C, Rajput VD, Wong MH. Biogeochemical and microscopic studies of soil and Phragmites australis (Cav.) Trin. ex Steud. plants affected by coal mine dumps. Environ Sci Pollut Res Int 2024; 31:406-421. [PMID: 38015398 DOI: 10.1007/s11356-023-31064-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 11/11/2023] [Indexed: 11/29/2023]
Abstract
Developed areas of the coal industry are subjected to long-term anthropogenic impacts from the input and accumulation of overburdened coal material, containing potentially toxic heavy metals and metalloids (HMM). For the first time, comprehensive studies of soils and plants in the territory of the Donetsk coal basin were carried out using X-ray fluorescence, atomic absorption analysis, and electron microscopy. The observed changes in the soil redox conditions were characterized by a high sulfur content, and formations of new microphases of S-containing compounds: FeS2, PbFe6(SO4)4(OH)12, ZnSO4·nH2O, revealed the presence of technogenic salinization, increased Сorg content, and low pH contents. Exceedances of soil maximum permissible concentrations of Pb, Zn, Cu, and As in areas affected by coal dumps were apparent. As a consequence of long-term transformation of the environment with changes in properties and chemical pollution, a phytotoxic effect was revealed in Phragmites australis (Cav.) Trin. ex Steud, accompanied by changes in ultrastructural and organization features of roots and leaves such as increases in root diameters and thickness of leaf blades. The changes in the ultrastructure of cell organelles: a violation of the grana formation process, an increase in the number of plastoglobules, a decrease in the number of mitochondrial cristae, and a reduction in the electron density of the matrix in peroxisomes were also observed. The accumulation of large electron-dense inclusions and membrane fragments in cell vacuoles was observed. Such ultrastructural changes may indicate the existence of a P. australis ecotype due to its long-term adaptation to the disturbed environment.
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Affiliation(s)
| | - Grigoriy Fedorenko
- Federal Research Center, the Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
| | | | | | | | | | | | | | | | | | - Yuri Popov
- Southern Federal University, Rostov-on-Don, Russia
| | - Christopher Rensing
- Institute of Environmental Microbiology, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | | | - Ming H Wong
- Southern Federal University, Rostov-on-Don, Russia
- Consortium on Health, Environment, Education, and Research (CHEER), and Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, Hong Kong, 999077, China
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Chernysheva D, Pudova L, Popov Y, Smirnova N, Maslova O, Allix M, Rakhmatullin A, Leontyev N, Nikolaev A, Leontyev I. Non-Isothermal Decomposition as Efficient and Simple Synthesis Method of NiO/C Nanoparticles for Asymmetric Supercapacitors. Nanomaterials (Basel) 2021; 11:nano11010187. [PMID: 33450986 PMCID: PMC7828437 DOI: 10.3390/nano11010187] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/24/2020] [Accepted: 12/27/2020] [Indexed: 11/20/2022]
Abstract
A series of NiO/C nanocomposites with NiO concentrations ranging from 10 to 90 wt% was synthesized using a simple and efficient two-step method based on non-isothermal decomposition of Nickel(II) bis(acetylacetonate). X-ray diffraction (XRD) measurements of these NiO/C nanocomposites demonstrate the presence of β-NiO. NiO/C nanocomposites are composed of spherical particles distributed over the carbon support surface. The average diameter of nickel oxide spheres increases with the NiO content and are estimated as 36, 50 and 205 nm for nanocomposites with 10, 50 and 80 wt% NiO concentrations, respectively. In turn, each NiO sphere contains several nickel oxide nanoparticles, whose average sizes are 7–8 nm. According to the tests performed using a three-electrode cell, specific capacitance (SC) of NiO/C nanocomposites increases from 200 to 400 F/g as the NiO content achieves a maximum of 60 wt% concentration, after which the SC decreases. The study of the NiO/C composite showing the highest SC in three- and two-electrode cells reveals that its SC remains almost unchanged while increasing the current density, and the sample demonstrates excellent cycling stability properties. Finally, NiO/C (60% NiO) composites are shown to be promising materials for charging quartz clocks with a power rating of 1.5 V (30 min).
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Affiliation(s)
- Daria Chernysheva
- Platov South-Russian State Polytechnic University (NPI), 346428 Novocherkassk, Russia; (D.C.); (L.P.); (N.S.)
| | - Ludmila Pudova
- Platov South-Russian State Polytechnic University (NPI), 346428 Novocherkassk, Russia; (D.C.); (L.P.); (N.S.)
| | - Yuri Popov
- Physics Department, Southern Federal University, 344090 Rostov-on-Don, Russia;
| | - Nina Smirnova
- Platov South-Russian State Polytechnic University (NPI), 346428 Novocherkassk, Russia; (D.C.); (L.P.); (N.S.)
| | - Olga Maslova
- Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, 346428 Tomsk, Russia;
| | - Mathieu Allix
- CNRS, CEMHTI UPR3079, Univ. Orléans, F-45071 Orléans, France; (M.A.); (A.R.)
| | - Aydar Rakhmatullin
- CNRS, CEMHTI UPR3079, Univ. Orléans, F-45071 Orléans, France; (M.A.); (A.R.)
| | - Nikolay Leontyev
- Azov-Black Sea Engineering Institute, Don State Agrarian University, Rostov region, 347740 Zernograd, Russia;
| | - Andrey Nikolaev
- Research and Education Center “Materials”, Don State Technical University, 344000 Rostov-on-Don, Russia;
| | - Igor Leontyev
- Physics Department, Southern Federal University, 344090 Rostov-on-Don, Russia;
- Correspondence: ; Tel.: +7-918-552-4024
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Chuluunbaatar O, Kouzakov K, Popov Y. Peculiarities of Matrix-Element Calculations with Few Coulomb Functions for Particles’ Scattering Processes. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201817303007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Specific features of the matrix-element calculations in the momentum-space representation are discussed for the single ionization of the He atom by fast proton impact in the case when the Coulomb interactions of all three charged fragments in the final state are taken into account. It is shown that a “soft” smoothing of the Coulomb singularity does not affect the accuracy of the calculations in a certain region of the smoothing parameter values.
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Kuriganova AB, Leontyev IN, Avramenko MV, Popov Y, Maslova OA, Koval OY, Smirnova NV. One-step Simultaneous Synthesis of Graphene and Pt Nanoparticles under the Action of Pulsed Alternating Current and Electrochemical Performance of Pt/Graphene Catalysts. ChemistrySelect 2017. [DOI: 10.1002/slct.201701186] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alexandra B. Kuriganova
- Platov South-Russian State Polytechnic University (NPI); ul. Prosveshenia 132 Novocherkassk 346428 Russia
| | - Igor N. Leontyev
- Southern Federal University; Russia Department; ul. Zorge 5 Rostov-on-Don 344090
| | - Marina V. Avramenko
- Southern Federal University; Russia Department; ul. Zorge 5 Rostov-on-Don 344090
| | - Yuri Popov
- Southern Federal University; Russia Department; ul. Zorge 5 Rostov-on-Don 344090
| | | | - Olga Yu. Koval
- Southern Federal University; Russia Department; ul. Zorge 5 Rostov-on-Don 344090
| | - Nina V. Smirnova
- Platov South-Russian State Polytechnic University (NPI); ul. Prosveshenia 132 Novocherkassk 346428 Russia
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Ponomarev K, Popov Y, Orlova E, Kirichenko D. Forced wetting of stainless steel by distilled water drop. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201715900037] [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: 11/14/2022] Open
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Jiang ZG, Feldbrügge L, Tapper EB, Popov Y, Ghaziani T, Afdhal N, Robson SC, Mukamal KJ. Letter: would aspirin alleviate fibrosis in alcoholic liver disease? Authors' reply. Aliment Pharmacol Ther 2016; 44:209-10. [PMID: 27296690 DOI: 10.1111/apt.13669] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Affiliation(s)
- Z G Jiang
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
| | - L Feldbrügge
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - E B Tapper
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Y Popov
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - T Ghaziani
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - N Afdhal
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - S C Robson
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - K J Mukamal
- Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
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Jiang ZG, Feldbrügge L, Tapper EB, Popov Y, Ghaziani T, Afdhal N, Robson SC, Mukamal KJ. Aspirin use is associated with lower indices of liver fibrosis among adults in the United States. Aliment Pharmacol Ther 2016; 43:734-43. [PMID: 26749582 DOI: 10.1111/apt.13515] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Revised: 11/02/2015] [Accepted: 12/13/2015] [Indexed: 12/18/2022]
Abstract
BACKGROUND Recent animal studies have shown that platelets directly activate hepatic stellate cells to promote liver fibrosis, whereas anti-platelet agents decrease liver fibrosis. It is unknown whether platelet inhibition by aspirin prevents liver fibrosis in humans. AIM To examine the association between aspirin use and liver fibrosis among adults with suspected chronic liver disease. METHODS We conducted a cross-sectional analysis using data from the National Health and Nutrition Examination Survey III. We identified 1856 individuals with suspected chronic liver disease (CLD). The degree of liver fibrosis was determined using four validated fibrosis indices and a composite index. RESULTS The use of aspirin was associated with a significantly lower composite liver fibrosis index calculated from FIB4, APRI, Forns and NFS [0.24 standard deviation (s.d.) units lower; 95% CI -0.42 to -0.06, P = 0.009]. The association of aspirin with lower fibrosis scores was significantly larger among those with suspected CLD compared to those without (-0.23 vs. -0.03 s.d. units; P interaction = 0.05). The negative association between aspirin use and lower fibrosis index was consistent across all four fibrosis indices (P = 0.002-0.08) in individuals with chronic viral hepatitis, suspected alcoholic liver disease and NASH. In comparison, no negative associations with liver fibrosis were seen with ibuprofen in parallel analyses. CONCLUSIONS The use of aspirin was associated with significantly lower indices of liver fibrosis among US adults with suspected chronic liver diseases. Aspirin and other anti-platelet drugs warrant further investigation for the prevention and treatment of liver fibrosis.
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Affiliation(s)
- Z Gordon Jiang
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - L Feldbrügge
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - E B Tapper
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Y Popov
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - T Ghaziani
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - N Afdhal
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - S C Robson
- Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - K J Mukamal
- Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
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Kirilov N, Petkova T, Atanasova J, Danova S, Iliev I, Popov Y, Haertle T, Ivanova IV. Proteolytic Activity in Lactic Acid Bacteria from Iraq, Armenia and Bulgaria. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2009.10818506] [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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Movsesyan I, Ahabekyan N, Bazukyan I, Madoyan R, Dalgalarrondo M, Chobert J, Popov Y, Haertlé T. Properties and Survival Under Simulated Gastrointestinal Conditions of Lactic Acid Bacteria Isolated from Armenian Cheeses and Matsuns. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.2010.10817880] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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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Ringbom A, Axelsson A, Aldener M, Auer M, Bowyer TW, Fritioff T, Hoffman I, Khrustalev K, Nikkinen M, Popov V, Popov Y, Ungar K, Wotawa G. Radioxenon detections in the CTBT international monitoring system likely related to the announced nuclear test in North Korea on February 12, 2013. J Environ Radioact 2014; 128:47-63. [PMID: 24316684 DOI: 10.1016/j.jenvrad.2013.10.027] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2013] [Revised: 10/29/2013] [Accepted: 10/31/2013] [Indexed: 06/02/2023]
Abstract
Observations made in April 2013 of the radioxenon isotopes (133)Xe and (131m)Xe at measurement stations in Japan and Russia, belonging to the International Monitoring System for verification of the Comprehensive Nuclear-Test-Ban Treaty, are unique with respect to the measurement history of these stations. Comparison of measured data with calculated isotopic ratios as well as analysis using atmospheric transport modeling indicate that it is likely that the xenon measured was created in the underground nuclear test conducted by North Korea on February 12, 2013, and released 7-8 weeks later. More than one release is required to explain all observations. The (131m)Xe source terms for each release were calculated to 0.7 TBq, corresponding to about 1-10% of the total xenon inventory for a 10 kt explosion, depending on fractionation and release scenario. The observed ratios could not be used to obtain any information regarding the fissile material that was used in the test.
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Affiliation(s)
- A Ringbom
- Swedish Defence Research Agency (FOI), Gulfossgatan 12, SE-164 90 Stockholm, Sweden.
| | - A Axelsson
- Swedish Defence Research Agency (FOI), Gulfossgatan 12, SE-164 90 Stockholm, Sweden
| | - M Aldener
- Swedish Defence Research Agency (FOI), Gulfossgatan 12, SE-164 90 Stockholm, Sweden
| | - M Auer
- Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization, Provisional Technical Secretariat, P.O. Box 1200, A-1400 Vienna, Austria
| | - T W Bowyer
- Pacific Northwest National Laboratory (PNNL), P.O. Box 999, Richland, WA 99352, USA
| | - T Fritioff
- Swedish Defence Research Agency (FOI), Gulfossgatan 12, SE-164 90 Stockholm, Sweden
| | - I Hoffman
- Radiation Protection Bureau, Health Canada, 755 Brookfield Rd., A.L. 6302D1, Ottawa, ON K1A 1C1, Canada
| | - K Khrustalev
- Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization, Provisional Technical Secretariat, P.O. Box 1200, A-1400 Vienna, Austria
| | - M Nikkinen
- Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization, Provisional Technical Secretariat, P.O. Box 1200, A-1400 Vienna, Austria
| | | | | | - K Ungar
- Radiation Protection Bureau, Health Canada, 755 Brookfield Rd., A.L. 6302D1, Ottawa, ON K1A 1C1, Canada
| | - G Wotawa
- Central Institute for Meteorology and Geodynamics (ZAMG), A-1190 Vienna, Austria
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Popov Y, Nikolov R, Lalova A. Localized eczema herpeticum with unilateral ocular involvement. Acta Dermatovenerol Alp Pannonica Adriat 2010; 19:35-37. [PMID: 20976420] [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: 05/30/2023]
Abstract
We report a case of eczema herpeticum with unilateral ocular involvement in a 16-year-old boy. The patient has had a mild form of atopic dermatitis (AD) since early childhood. Why AD patients are prone to herpes simplex virus (HSV) infections is still unclear. Ocular pathologic findings in these cases are rarely reported.
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Affiliation(s)
- Y Popov
- Department of Dermatology and Venereology, Medical University, 1 Sv. Georgi Sofiiski, Sofia, Bulgaria
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Patsenker E, Popov Y, Stickel F, Schneider V, Ledermann M, Sägesser H, Niedobitek G, Goodman SL, Schuppan D. Pharmacological inhibition of integrin alphavbeta3 aggravates experimental liver fibrosis and suppresses hepatic angiogenesis. Hepatology 2009; 50:1501-11. [PMID: 19725105 PMCID: PMC2779730 DOI: 10.1002/hep.23144] [Citation(s) in RCA: 137] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
UNLABELLED The vitronectin receptor integrin alphavbeta3 promotes angiogenesis by mediating migration and proliferation of endothelial cells, but also drives fibrogenic activation of hepatic stellate cells (HSCs) in vitro. Expecting antifibrotic synergism, we studied the effect of alphavbeta3 inhibition in two in vivo models of liver fibrogenesis. Liver fibrosis was induced in rats by way of bile duct ligation (BDL) for 6 weeks or thioacetamide (TAA) injections for 12 weeks. A specific alphavbeta3 (alphavbeta5) inhibitor (Cilengitide) was given intraperitoneally twice daily at 15 mg/kg during BDL or after TAA administration. Liver collagen was determined as hydroxyproline, and gene expression was quantified by way of quantitative polymerase chain reaction. Liver angiogenesis, macrophage infiltration, and hypoxia were assessed by way of CD31, CD68 and hypoxia-inducible factor-1alpha immunostaining. Cilengitide decreased overall vessel formation. This was significant in portal areas of BDL and septal areas of TAA fibrotic rats and was associated with a significant increase of liver collagen by 31% (BDL) and 27% (TAA), and up-regulation of profibrogenic genes and matrix metalloproteinase-13. Treatment increased gamma glutamyl transpeptidase in both models, while other serum markers remained unchanged. alphavbeta3 inhibition resulted in mild liver hypoxia, as evidenced by up-regulation of hypoxia-inducible genes. Liver infiltration by macrophages/Kupffer cells was not affected, although increases in tumor necrosis factor alpha, interleukin-18, and cyclooxygenase-2 messenger RNA indicated modest macrophage activation. CONCLUSION Specific inhibition of integrin alphavbeta3 (alphavbeta5) in vivo decreased angiogenesis but worsened biliary (BDL) and septal (TAA) fibrosis, despite its antifibrogenic effect on HSCs in vitro. Angiogenesis inhibitors should be used with caution in patients with hepatic fibrosis.
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Affiliation(s)
- E. Patsenker
- Department of Medicine I, University of Erlangen-Nuernberg, Germany, Institute of Clinical Pharmacology and Visceral Research, University of Bern, Bern, Switzerland
| | - Y. Popov
- Department of Medicine I, University of Erlangen-Nuernberg, Germany, Division of Gastroenterology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston MA, USA
| | - F. Stickel
- Institute of Clinical Pharmacology and Visceral Research, University of Bern, Bern, Switzerland
| | - V. Schneider
- Institute of Clinical Pharmacology and Visceral Research, University of Bern, Bern, Switzerland
| | - M. Ledermann
- Institute of Clinical Pharmacology and Visceral Research, University of Bern, Bern, Switzerland
| | - H. Sägesser
- Institute of Clinical Pharmacology and Visceral Research, University of Bern, Bern, Switzerland
| | - G. Niedobitek
- Department of Medicine I, University of Erlangen-Nuernberg, Germany
| | - S. L. Goodman
- Therapeutic area oncology Research, Merck KG, Darmstadt, Germany
| | - D. Schuppan
- Department of Medicine I, University of Erlangen-Nuernberg, Germany, Division of Gastroenterology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston MA, USA
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Buko VU, Lukivskaya O, Naruta E, Popov Y, Chirkin A, Chirkina I, Oettel M, Römer W, Hübler D. Antiatherogenic effects of 17β-estradiol and 17α-estradiol and its derivative J811 in cholesterol-fed rabbits with thyroid inhibition. Climacteric 2009. [DOI: 10.1080/cmt.4.1.49.57] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Omenetti A, Popov Y, Jung Y, Choi SS, Witek RP, Yang L, Brown KD, Schuppan D, Diehl AM. The hedgehog pathway regulates remodelling responses to biliary obstruction in rats. Gut 2008; 57:1275-82. [PMID: 18375471 DOI: 10.1136/gut.2008.148619] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Abstract
BACKGROUND Chronic biliary obstruction provokes fibrosis and accumulation of immature ductular cells. This fibroductular reaction resolves following biliary decompression, suggesting that it may also be involved in the repair of biliary damage. The hedgehog (Hh) pathway becomes activated in liver after bile duct ligation (BDL), and might modulate hepatic remodelling because Hh ligands are potent morphogens. OBJECTIVE To study the induction of the Hh pathway during progression and resolution of biliary fibrosis, and to clarify whether Hh signalling regulates accumulation of bile duct progenitor cells. DESIGN AND MAIN OUTCOME MEASURES Livers from rats with BDL were examined by quantitative real-time polymerase chain reaction analysis and immunohistochemistry to identify factors that might stimulate Hh signalling. BDL rats were subjected to Roux-en-Y hepaticojejunostomy (R-Y) to relieve biliary obstruction in order to determine whether these factors and Hh signalling declined as ductular populations and concomitant fibrosis regressed. Cultures of immature ductular cells were treated with putative Hh inducers and Hh ligands to confirm their functional relevance. RESULTS BDL increased expression of platelet-derived growth factor-BB (PDGF-BB) and sonic hedgehog (Shh), downregulated hedgehog-interacting protein (Hip), activated Hh signalling, and expanded populations of Hh-responsive ductular cells that expressed pancyotkeratin, a liver progenitor cell marker. After R-Y, Hip remained suppressed, expression of PDGF-BB and Shh gradually declined, and populations of hedgehog-responsive ductular cells regressed. In cultured ductular cells, PDGF-BB treatment induced Shh expression, and incubation with Shh inhibited apoptotic activity. CONCLUSIONS These results identify a mechanism for activation of the Hh pathway during cholestasis and suggest that Hh signalling regulates ductular cell accumulation after biliary injury.
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Affiliation(s)
- A Omenetti
- Division of Gastroenterology, Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA
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Mayr SI, Wittmann A, Burkhardt H, Popov Y, Romushkevich R, Bayuk I, Heidinger P, Wilhelm H. Integrated interpretation of physical properties of rocks of the borehole Yaxcopoil-1 (Chicxulub impact structure). ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jb005420] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Darbinian-Sarkissian N, Darbinyan A, Otte J, Radhakrishnan S, Sawaya BE, Arzumanyan A, Chipitsyna G, Popov Y, Rappaport J, Amini S, Khalili K. p27(SJ), a novel protein in St John's Wort, that suppresses expression of HIV-1 genome. Gene Ther 2006; 13:288-95. [PMID: 16251997 DOI: 10.1038/sj.gt.3302649] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [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: 11/09/2022]
Abstract
Transcription of the HIV-1 genome is controlled by the cooperation of viral regulatory proteins and several host factors which bind to specific DNA sequences within the viral promoter spanning the long terminal repeat, (LTR). Here, we describe the identification of a novel protein, p27(SJ), present in a laboratory callus culture of Hypericum perforatum (St John's Wort) that suppresses transcription of the HIV-1 genome in several human cell types including primary culture of microglia and astrocytes. p27(SJ) associates with C/EBPbeta, a transcription factor that regulates expression of the HIV-1 genome in macrophages and monocytic cells, and the viral transactivator, Tat. The association of p27(SJ) with C/EBPbeta and Tat alters their subcellular localization, causing their accumulation in the perinuclear cytoplasmic compartment of the cells. Fusion of a nuclear localization signal to p27(SJ) forces its entry into the nucleus and diminishes the capacity of p27(SJ) to suppress Tat activity, but does not alter its ability to suppress C/EBPbeta activation of the LTR. Results from binding assays showed the inhibitory effect of p27(SJ) on C/EBPbeta interaction with DNA. Finally, our results demonstrate that expression of p27(SJ) decreases the level of viral replication in HIV-1-infected cells. These observations suggest the potential for the development of a therapeutic advance based on p27(SJ) protein to control HIV-1 transcription and replication in cells associated with HIV-1 infection in the brain.
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Affiliation(s)
- N Darbinian-Sarkissian
- Department of Neuroscience, Center for Neurovirology, Temple University School of Medicine, Philadelphia, PA, USA
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17
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Auer M, Axelsson A, Blanchard X, Bowyer TW, Brachet G, Bulowski I, Dubasov Y, Elmgren K, Fontaine JP, Harms W, Hayes JC, Heimbigner TR, McIntyre JI, Panisko ME, Popov Y, Ringbom A, Sartorius H, Schmid S, Schulze J, Schlosser C, Taffary T, Weiss W, Wernsperger B. Intercomparison experiments of systems for the measurement of xenon radionuclides in the atmosphere. Appl Radiat Isot 2004; 60:863-77. [PMID: 15110352 DOI: 10.1016/j.apradiso.2004.01.011] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2003] [Revised: 12/20/2003] [Accepted: 01/15/2004] [Indexed: 11/19/2022]
Abstract
Radioactive xenon monitoring is one of the main technologies used for the detection of underground nuclear explosions. Precise and reliable measurements of (131m)Xe, (133g)Xe, (133m)Xe, and (135g)Xe are required as part of the International Monitoring System for compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT). For the first time, simultaneous testing of four highly sensitive and automated fieldable radioxenon measurement systems has been performed and compared to established laboratory techniques. In addition to an intercomparison of radioxenon monitoring equipment of different design, this paper also presents a set of more than 2000 measurements of activity concentrations of radioactive xenon made in the city of Freiburg, Germany in 2000. The intercomparison experiment showed, that the results from the newly developed systems agree with each other and the equipment fulfills the fundamental requirements for their use in the verification regime of the CTBT. For 24-h measurements, concentrations as low as 0.1 mBqm(-3) were measured for atmospheric samples ranging in size from 10 to 80 m(3). The (133)Xe activity concentrations detected in the ambient air ranged from below 1 mBqm(-3) to above 100 mBqm(-3).
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Affiliation(s)
- M Auer
- Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization, P.O. Box 1200, Vienna A-1400, Austria
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18
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Buko VU, Lukivskaya O, Naruta E, Popov Y, Chirkin A, Chirkina I, Oettel M, Römer W, Hübler D. Antiatherogenic effects of 17 beta-estradiol and 17 alpha-estradiol and its derivative J811 in cholesterol-fed rabbits with thyroid inhibition. Climacteric 2001; 4:49-57. [PMID: 11379378] [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: 02/20/2023]
Abstract
OBJECTIVE The aim of this study was to investigate the antiatherogenic effects of 17 beta-estradiol and 17 alpha-estradiol and its derivative J811 (estra-1,3,5(10),8-tetraene-3, 17 alpha-diol), having a non-feminizing effect and high antioxidant potential, in male rabbits. EXPERIMENTAL DESIGN Male White-Russian rabbits weighing 2.1-2.6 kg were fed either a standard or a high-cholesterol (200 mg/kg) diet, with thyroid function-inhibiting thiouracil (20 mg/kg) combined with cholic acid (40 mg/kg) administered daily in sunflower oil for 3 months. During the last month of the study, estrogens were administered by gavage at a dose of 0.02 or 0.1 mg/kg. RESULTS AND CONCLUSIONS All three estrogens exerted remarkable antiatherosclerotic effects. Decreases in serum and aortic-wall lipid parameters and the index of atherogenicity were dependent on estrogen dose. Morphological evaluation of the aortic wall (height of plaques, size of plaque relative to aortic half-circumference) showed only weak therapeutic effects with all three estrogens. It is an open question whether the treatment period was too short to reverse the above changes. On the other hand, the data clearly suggest that 17 alpha-estradiol and J811 offer new perspectives for the prevention of atherosclerosis in men, which is similar to that found with 17 beta-estradiol in women.
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Affiliation(s)
- V U Buko
- Institute of Biochemistry, Belarussian Academy of Sciences, Grodno, Belarus
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19
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Abstract
We describe 3 professional footballers who developed lichenoid dermatitis over a short period of time. Clinically, the eruption in all 3 of them can be classified as lichenoid photodermatitis. We suggest an influence of possible contact allergens or photo-active substances. Histologic evidence points to features of classical lichen planus with purpura, typical of lichen aureus (purpuricus), but showing some clinical and morphological differences.
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Affiliation(s)
- M Balabanova
- Institute of Dermatology and Venereology, Medical Academy, Sofia, Bulgaria
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20
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Anastassov C, Popov Y. Financial aspects of stomatological services in the people's Republic of Bulgaria. Int Dent J 1970; 20:241-8. [PMID: 5270719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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