1
|
Petronek MS, Allen BG. Maintenance of genome integrity by the late-acting cytoplasmic iron-sulfur assembly (CIA) complex. Front Genet 2023; 14:1152398. [PMID: 36968611 PMCID: PMC10031043 DOI: 10.3389/fgene.2023.1152398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 02/24/2023] [Indexed: 03/29/2023] Open
Abstract
Iron-sulfur (Fe-S) clusters are unique, redox-active co-factors ubiquitous throughout cellular metabolism. Fe-S cluster synthesis, trafficking, and coordination result from highly coordinated, evolutionarily conserved biosynthetic processes. The initial Fe-S cluster synthesis occurs within the mitochondria; however, the maturation of Fe-S clusters culminating in their ultimate insertion into appropriate cytosolic/nuclear proteins is coordinated by a late-acting cytosolic iron-sulfur assembly (CIA) complex in the cytosol. Several nuclear proteins involved in DNA replication and repair interact with the CIA complex and contain Fe-S clusters necessary for proper enzymatic activity. Moreover, it is currently hypothesized that the late-acting CIA complex regulates the maintenance of genome integrity and is an integral feature of DNA metabolism. This review describes the late-acting CIA complex and several [4Fe-4S] DNA metabolic enzymes associated with maintaining genome stability.
Collapse
|
2
|
Petronek MS, St-Aubin JJ, Lee CY, Spitz DR, Gillan EG, Allen BG, Magnotta VA. Quantum chemical insight into the effects of the local electron environment on T 2*-based MRI. Sci Rep 2021; 11:20817. [PMID: 34675308 PMCID: PMC8531323 DOI: 10.1038/s41598-021-00305-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 10/08/2021] [Indexed: 01/28/2023] Open
Abstract
T2* relaxation is an intrinsic magnetic resonance imaging (MRI) parameter that is sensitive to local magnetic field inhomogeneities created by the deposition of endogenous paramagnetic material (e.g. iron). Recent studies suggest that T2* mapping is sensitive to iron oxidation state. In this study, we evaluate the spin state-dependence of T2* relaxation using T2* mapping. We experimentally tested this physical principle using a series of phantom experiments showing that T2* relaxation times are directly proportional to the spin magnetic moment of different transition metals along with their associated magnetic susceptibility. We previously showed that T2* relaxation time can detect the oxidation of Fe2+. In this paper, we demonstrate that T2* relaxation times are significantly longer for the diamagnetic, d10 metal Ga3+, compared to the paramagnetic, d5 metal Fe3+. We also show in a cell culture model that cells supplemented with Ga3+ (S = 0) have a significantly longer relaxation time compared to cells supplemented with Fe3+ (S = 5/2). These data support the hypothesis that dipole-dipole interactions between protons and electrons are driven by the strength of the electron spin magnetic moment in the surrounding environment giving rise to T2* relaxation.
Collapse
Affiliation(s)
- M. S. Petronek
- grid.214572.70000 0004 1936 8294Department of Radiation Oncology, University of Iowa, Iowa City, IA USA ,grid.412584.e0000 0004 0434 9816Division of Free Radical and Radiation Biology, Department of Radiation Oncology, The University of Iowa Hospitals and Clinics, Iowa City, IA 52242-1181 USA
| | - J. J. St-Aubin
- grid.214572.70000 0004 1936 8294Department of Radiation Oncology, University of Iowa, Iowa City, IA USA
| | - C. Y. Lee
- grid.214572.70000 0004 1936 8294Department of Radiology, University of Iowa, Iowa City, IA USA
| | - D. R. Spitz
- grid.214572.70000 0004 1936 8294Department of Radiation Oncology, University of Iowa, Iowa City, IA USA
| | - E. G. Gillan
- grid.214572.70000 0004 1936 8294Department of Chemistry, University of Iowa, Iowa City, IA USA
| | - B. G. Allen
- grid.214572.70000 0004 1936 8294Department of Radiation Oncology, University of Iowa, Iowa City, IA USA
| | - V. A. Magnotta
- grid.214572.70000 0004 1936 8294Department of Radiology, University of Iowa, Iowa City, IA USA ,grid.412584.e0000 0004 0434 9816Department of Radiology, The University of Iowa Hospitals and Clinics, Iowa City, IA 52242 USA
| |
Collapse
|
3
|
Utilization of Pharmacological Ascorbate to Enhance Hydrogen Peroxide-Mediated Radiosensitivity in Cancer Therapy. Int J Mol Sci 2021; 22:ijms221910880. [PMID: 34639220 PMCID: PMC8509557 DOI: 10.3390/ijms221910880] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/30/2021] [Accepted: 10/04/2021] [Indexed: 01/05/2023] Open
Abstract
Interest in the use of pharmacological ascorbate as a treatment for cancer has increased considerably since it was introduced by Cameron and Pauling in the 1970s. Recently, pharmacological ascorbate has been used in preclinical and early-phase clinical trials as a selective radiation sensitizer in cancer. The results of these studies are promising. This review summarizes data on pharmacological ascorbate (1) as a safe and efficacious adjuvant to cancer therapy; (2) as a selective radiosensitizer of cancer via a mechanism involving hydrogen peroxide; and (3) as a radioprotector in normal tissues. Additionally, we present new data demonstrating the ability of pharmacological ascorbate to enhance radiation-induced DNA damage in glioblastoma cells, facilitating cancer cell death. We propose that pharmacological ascorbate may be a general radiosensitizer in cancer therapy and simultaneously a radioprotector of normal tissue.
Collapse
|
4
|
Ambroz HB, Przybytniak GK. Epr Studies on Radiation-Damaged Dna –the Contribution of Martyn Symons. PROGRESS IN REACTION KINETICS AND MECHANISM 2019. [DOI: 10.3184/007967403103165440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This review presents a summary of Professor Martyn Symons’ role in radiation studies on the key biopolymer DNA, a contribution that cannot be overestimated. Some of his achievements are revealed, along with his influence on other research performed all over the world, illustrated by our own work on the effects of transition metal ions (iron and copper) and of thiols on radiation-induced damage to DNA.
Collapse
Affiliation(s)
- Hanna B. Ambroz
- Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warszawa, Poland
| | | |
Collapse
|
5
|
Huang J, Lim MY, Zhao B, Shao L, Lao L. PM2.5 and ash residue from combustion of moxa floss. Acupunct Med 2015; 34:101-6. [PMID: 26516134 DOI: 10.1136/acupmed-2015-010914] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/07/2015] [Indexed: 11/03/2022]
Abstract
BACKGROUND Moxibustion, a Traditional Chinese Medicine technique, involves burning moxa floss to apply heat to certain points or areas of the body surface to treat disease. Moxibustion releases a considerable amount of smoke into the environment. There remains controversy over the safety of moxa smoke and its potential effects on human health. METHODS We measured the PM2.5 (particulate matter with aerodynamic diameter <2.5 μm) mass concentration in moxa smoke and the oxidative capacity of PM2.5 and moxa ash (using a plasmid scission assay in whole and water-soluble fractions) in the by-products of moxibustion produced from burning moxa floss of different ratios (3:1 or 15:1) and duration of storage (3 or 10 years) in three simulated moxibustion clinics. RESULTS PM2.5 mass concentration was 224.28, 226.39 and 210.56 μg/m(3) for samples A (3 years and 3:1 ratio), B (3 years and 15:1 ratio), and C (10 years and 3:1 ratio), respectively. Average D500 oxidative damage of PM2.5 was 29.42%, 29.16% and 27.01% and that of moxa ash was 22.78%, 20.60% and 21.42% for samples A, B and C, respectively. PM2.5 demonstrated a significantly greater oxidative capacity than moxa ash (p<0.05). CONCLUSIONS The oxidative DNA damage induced by individual PM2.5 following moxibustion was lower than that reported in other environments. However, PM2.5 mass concentration after moxibustion is still relatively high. We would recommend ensuring adequate ventilation during moxibustion to reduce any possible risks. Further studies are needed to better define the potential impact of particles in moxibustion by-products on human health.
Collapse
Affiliation(s)
- Jian Huang
- School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Min Yee Lim
- School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Baixiao Zhao
- School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Longyi Shao
- State Key Laboratory of Coal Resources and Safe Mining, College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, China
| | - Lixing Lao
- School of Chinese Medicine, The University of Hong Kong, Hong Kong, China
| |
Collapse
|
6
|
Huang J, Lim MY, Hwang C, Zhao B, Shao L. Contrasts in spatial and temporal variability of oxidative capacity and elemental composition in moxibustion, indoor and outdoor environments in Beijing. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2015; 202:78-84. [PMID: 25818086 DOI: 10.1016/j.envpol.2015.03.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 03/06/2015] [Accepted: 03/08/2015] [Indexed: 06/04/2023]
Abstract
Moxibustion is a traditional Chinese medicine therapy that burns moxa floss which produces a substantial amount of PM10 into the environment, thus spawning safety concerns about health impacts of the smoke. We compared the oxidative capacity and elemental composition of moxibustion-derived and ambient PM10 in summer and winter to provide a source-, spatial- and temporal-comparison of PM10 biological responses. The PM10 oxidative capacity was 2.04 and 1.45 fold lower, and dose-dependent slope gradient was 2.36 and 1.76 fold lower in moxibustion environment than indoor or outdoor. Oxidative damage was highly correlated with iron, cesium, aluminum and cobalt in indoor, but moxibustion environment displayed low associations. The total elemental concentration was also lower in moxibustion environment than indoor (2.28 fold) or outdoor (2.79 fold). The source-to-dose modeling and slope gradient analysis in this study can be used as a model for future source-, spatial- and temporal-related moxibustion safety evaluation studies.
Collapse
Affiliation(s)
- Jian Huang
- School of Acupuncture and Moxibustion, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Min Yee Lim
- School of Acupuncture and Moxibustion, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Chaxi Hwang
- School of Acupuncture and Moxibustion, Beijing University of Chinese Medicine, Beijing, 100029, China
| | - Baixiao Zhao
- School of Acupuncture and Moxibustion, Beijing University of Chinese Medicine, Beijing, 100029, China.
| | - Longyi Shao
- State Key Laboratory of Coal Resources and Safe Mining, College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China
| |
Collapse
|
7
|
Sun Z, Shao L, Mu Y, Hu Y. Oxidative capacities of size-segregated haze particles in a residential area of Beijing. J Environ Sci (China) 2014; 26:167-174. [PMID: 24649703 DOI: 10.1016/s1001-0742(13)60394-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The frequent haze days around the Chinese capital of Beijing in recent years have aroused great attention owing to the detrimental effects on visibility and public health. To discover the potential health effects of the haze, oxidative capacities of airborne particles collected in Beijing during haze and clear days were comparably assessed by a plasmid scission assay. Eleven water-soluble trace elements (As, Cd, Cr, Cu, Mn, Ni, Pb, V, Se, Tl, and Zn) in the size-segregated airborne particles were quantitatively analyzed by inductively coupled plasma mass spectrometry, and most of the water-soluble trace elements were found to mainly concentrate in the fine particle size of 0.56-1.0 microm. In comparison with clear days, the mass concentrations of 11 analyzed water-soluble trace elements remarkably increased during haze days, and the oxidative capacities determined by the plasmid scission assay were markedly elevated accordingly during the haze days under the same dosage of particles as for those during clear days. Water-soluble trace elements in airborne particles, such as Cu, V, and particularly Zn, were found to have significantly positive correlations with the plasmid DNA damage rates. Because Cu, V, and Zn have been considered as bioavailable elements, the evident increase of these elements during haze days may be greatly harmful to human health.
Collapse
|
8
|
Zhang JJ, Wang B, Li YF, Jia WL, Cui H, Wang HS. Electrochemical Study on DNA Damage Based on the Direct Oxidation of 8-Hydroxydeoxyguanosine at an Electrochemically Modified Glassy Carbon Electrode. ELECTROANAL 2008. [DOI: 10.1002/elan.200804233] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
9
|
Correlation between plasmid DNA damage induced by PM10 and trace metals in inhalable particulate matters in Beijing air. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/s11430-006-2020-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
10
|
Edgcomb VP, Molyneaux SJ, Böer S, Wirsen CO, Saito M, Atkins MS, Lloyd K, Teske A. Survival and growth of two heterotrophic hydrothermal vent archaea, Pyrococcus strain GB-D and Thermococcus fumicolans, under low pH and high sulfide concentrations in combination with high temperature and pressure regimes. Extremophiles 2006; 11:329-42. [PMID: 17111090 DOI: 10.1007/s00792-006-0043-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2006] [Accepted: 10/22/2006] [Indexed: 11/26/2022]
Abstract
Growth and survival of hyperthermophilic archaea in their extreme hydrothermal vent and subsurface environments are controlled by chemical and physical key parameters. This study examined the effects of elevated sulfide concentrations, temperature, and acidic pH on growth and survival of two hydrothermal vent archaea (Pyrococcus strain GB-D and Thermococcus fumicolans) under high temperature and pressure regimes. These two strains are members of the Thermococcales, a family of hyperthermophilic, heterotrophic, sulfur-reducing archaea that occur in high densities at vent sites. As actively growing cells, these two strains tolerated regimes of pH, pressure, and temperature that were in most cases not tolerated under severe substrate limitation. A moderate pH of 5.5-7 extends their survival and growth range over a wider range of sulfide concentrations, temperature and pressure, relative to lower pH conditions. T. fumicolans and Pyrococcus strain GB-D grew under very high pressures that exceeded in-situ pressures typical of hydrothermal vent depths, and included deep subsurface pressures. However, under the same conditions, but in the absence of carbon substrates and electron acceptors, survival was generally lower, and decreased rapidly when low pH stress was combined with high pressure and high temperature.
Collapse
Affiliation(s)
- Virginia P Edgcomb
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Nevzorova TA, Vinter VG, Konovalova OA, Salakhov MK. Mechanism of action of DNA-hydrolyzing antibodies to DNA from blood of patients with systemic lupus erythematosus. BIOCHEMISTRY (MOSCOW) 2006; 71:1238-46. [PMID: 17140385 DOI: 10.1134/s0006297906110095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Four fractions of IgG antibodies to native DNA (nDNA) were obtained from blood of patients with systemic lupus erythematosus (SLE). These antibodies displayed a thermostable DNA-hydrolyzing activity and were different in affinity for DNA-cellulose and sorption on DEAE-cellulose. DNA-hydrolyzing antibodies to nDNA are metal-dependent endonucleases, cause mainly single-strand breaks in DNA, and are active over a wide range of pH. By atomic-force microscopy, three-dimensional images of DNA complexes with DNA-hydrolyzing antibodies to nDNA were obtained with nanometer resolution, and a nonprocessive action mechanism was shown for the DNase activity of antibodies to nDNA.
Collapse
|
12
|
Shao L, Shi Z, Jones TP, Li J, Whittaker AG, Bérubé KA. Bioreactivity of particulate matter in Beijing air: results from plasmid DNA assay. THE SCIENCE OF THE TOTAL ENVIRONMENT 2006; 367:261-72. [PMID: 16313948 DOI: 10.1016/j.scitotenv.2005.10.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2004] [Revised: 10/07/2005] [Accepted: 10/07/2005] [Indexed: 05/05/2023]
Abstract
An in vitro plasmid assay was employed to study the bioreactivity of PM (particulate matter) in Beijing air. It was found that the TD20 (toxic dose of PM causing 20% of plasmid DNA damage) of Beijing PM can be as low as 28 microg ml(-1) and as high as >1000 microg ml(-1). Comparison of the physical properties, such as morphology and size distribution, and oxidative potential indicates that the PM(2.5) (particulate matter with an aerodynamic diameter of 2.5 microm or less) has a stronger oxidative capacity than PM(10) (particulate matter with an aerodynamic diameter of 10 microm or less), and that the higher number percentages of soot aggregates and lower number percentages of mineral and fly ashes are associated with the higher oxidative capacity. Although the mass of PM(10) during dust storms is commonly 5 times higher than that during non-dust storm episodes, the oxidative capacity of PM(10)s of dust storms is much lower than that of the non-dust storm PM(10)s. The water-soluble fractions and intact whole particle solutions of Beijing airborne particles produce similar plasmid assay results, demonstrating that the bioreactivity of Beijing airborne particles is mainly sourced from the water-soluble fraction. In the samples with stronger bioreactivity, the total analyzed water soluble Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As and Pb (ppm) concentrations are higher. The water soluble zinc shows a good negative correlation with TD20s, suggesting that the water-soluble zinc is probably the major element responsible for the plasmid DNA damage.
Collapse
Affiliation(s)
- Longyi Shao
- Key Laboratory of Coal Resources of Chinese Ministry of Education and the Department of Resources and Earth Sciences, China University of Mining and Technology, D11, Xueyuan Road, Beijing, 100083, PR China.
| | | | | | | | | | | |
Collapse
|
13
|
Ambroż HB, Kemp TJ, Rodger A, Przybytniak G. Ferric and ferrous ions: binding to DNA and influence on radiation-induced processes. Radiat Phys Chem Oxf Engl 1993 2004. [DOI: 10.1016/j.radphyschem.2003.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
14
|
Ambroż HB, Kornacka EM, Przybytniak GK. Influence of cysteamine on the protection and repair of radiation-induced damage to DNA. Radiat Phys Chem Oxf Engl 1993 2004. [DOI: 10.1016/j.radphyschem.2003.11.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
15
|
Shi Z, Shao L, Jones TP, Whittaker AG, Richards RJ, Zhang P. Oxidative stress on plasmid DNA induced by inhalable particles in the urban atmosphere. ACTA ACUST UNITED AC 2004. [DOI: 10.1007/bf03184267] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|