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Yousefi A, Ying C, Parmenter CD, Assadipapari M, Sanderson G, Zheng Z, Xu L, Zargarbashi S, Hickman GJ, Cousins RB, Mellor CJ, Mayer M, Rahmani M. Optical Monitoring of In Situ Iron Loading into Single, Native Ferritin Proteins. NANO LETTERS 2023; 23:3251-3258. [PMID: 37053043 PMCID: PMC10141409 DOI: 10.1021/acs.nanolett.3c00042] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Ferritin is a protein that stores and releases iron to prevent diseases associated with iron dysregulation in plants, animals, and bacteria. The conversion between iron-loaded holo-ferritin and empty apo-ferritin is an important process for iron regulation. To date, studies of ferritin have used either ensemble measurements to quantify the characteristics of a large number of proteins or single-molecule approaches to interrogate labeled or modified proteins. Here we demonstrate the first real-time study of the dynamics of iron ion loading and biomineralization within a single, unlabeled ferritin protein. Using optical nanotweezers, we trapped single apo- and holo-ferritins indefinitely, distinguished one from the other, and monitored their structural dynamics in real time. The study presented here deepens the understanding of the iron uptake mechanism of ferritin proteins, which may lead to new therapeutics for iron-related diseases.
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Affiliation(s)
- Arman Yousefi
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
| | - Cuifeng Ying
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
- Email
for C.Y.:
| | | | - Mahya Assadipapari
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
| | - Gabriel Sanderson
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
| | - Ze Zheng
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
| | - Lei Xu
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
| | - Saaman Zargarbashi
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
| | - Graham J. Hickman
- School
of Science and Technology, Nottingham Trent
University, Nottingham NG11 8NS, United
Kingdom
| | - Richard B. Cousins
- Nanoscale
and Microscale Research Centre, University
of Nottingham, Nottingham NG7 2RD, United
Kingdom
| | - Christopher J. Mellor
- School
of Physics and Astronomy, University of
Nottingham, Nottingham NG7 2RD, United
Kingdom
| | - Michael Mayer
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
| | - Mohsen Rahmani
- Advanced
Optics and Photonics Laboratory, Department of Engineering, School
of Science and Technology, Nottingham Trent
University, Nottingham NG118 NS, United
Kingdom
- Email for M.R.:
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2
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Han H, Zhang Z, Zhang Y. Research on the Catalytic Hydrolysis of COS by Fe−Cu/AC Catalyst and Its Inactivation Mechanism at Low Temperature**. ChemistrySelect 2022. [DOI: 10.1002/slct.202200194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hehe Han
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical Engineering Changzhou University Changzhou 213164 China
| | - Zhihong Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical Engineering Changzhou University Changzhou 213164 China
| | - Yaolei Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical Engineering Changzhou University Changzhou 213164 China
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3
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Zhang Y, Zhang Z, Liu X, Liu L, Peng J. Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H
2
S at Low Temperature. ChemistrySelect 2020. [DOI: 10.1002/slct.202001834] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yaolei Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and TechnologySchool of Petrochemical EngineeringChangzhou University Changzhou 213164 Jiangsu China
| | - Zhihong Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and TechnologySchool of Petrochemical EngineeringChangzhou University Changzhou 213164 Jiangsu China
| | - Xuedong Liu
- Jiangsu Key Laboratory of Green Process EquipmentInstitute of Energy Chemical EquipmentChangzhou University Changzhou 213164 Jiangsu China
| | - Lin Liu
- Jiangsu Key Laboratory of Green Process EquipmentInstitute of Energy Chemical EquipmentChangzhou University Changzhou 213164 Jiangsu China
| | - Jian Peng
- Jiangsu Key Laboratory of Green Process EquipmentInstitute of Energy Chemical EquipmentChangzhou University Changzhou 213164 Jiangsu China
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4
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Wang H, Liang D, Wang YN, Sun Y, Li W, Zhang D, Tsang YF, Pan X. Fabricating biogenic Fe(III) flocs from municipal sewage sludge using NAFO processes: Characterization and arsenic removal ability. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 231:268-274. [PMID: 30347345 DOI: 10.1016/j.jenvman.2018.10.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 07/11/2018] [Accepted: 10/13/2018] [Indexed: 06/08/2023]
Abstract
This study involved fabricating biogenic Fe(III) flocs enriched from municipal sludge using microbial nitrate-dependent anaerobic Fe(II)-oxidizing (NAFO) processes. The research focused on bacterial community compositions and physicochemical properties of the biogenic Fe(III) flocs and their ability to adsorb arsenic (As). High-throughput sequencing analysis showed that significant microbial succession occurs in the raw sludge after the NAFO processes. The predominant bacterial communities in the biogenic Fe(III) flocs included Rhodanobacter, Parvibaculum, Gemmatimonas and Segetibacter genera. Microscopic and spectroscopic analyses included scanning electron microscopy - energy disperse spectroscopy (SEM-EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. These tests indicated that biogenic Fe(III) flocs were a mixture of NAFO bacteria and nanosized, poorly crystalline Fe(III) oxide particles. Batch experiments showed that after 120 min of reaction time, more than 95% of As(III) and As(V) (at an initial concentrations of 0.25 mg/L) were effectively removed with 120 ppm biogenic Fe(III) flocs. In addition, biogenic Fe(III) flocs removed As more effectively than abiotic Fe(III) flocs. These findings indicated that biogenic Fe(III) flocs produced from municipal sludge using NAFO processes performed well in removing As.
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Affiliation(s)
- Huawei Wang
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, PR China; Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong, China
| | - Dandan Liang
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China
| | - Ya-Nan Wang
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China
| | - Yingjie Sun
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China.
| | - Weihua Li
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China
| | - Daoyong Zhang
- Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, PR China
| | - Yiu Fai Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong, China.
| | - Xiangliang Pan
- Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, PR China
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5
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Oxidative stress in ageing and disease development studied by FT-IR spectroscopy. Mech Ageing Dev 2017; 172:107-114. [PMID: 29113732 DOI: 10.1016/j.mad.2017.11.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 08/31/2017] [Accepted: 11/01/2017] [Indexed: 11/21/2022]
Abstract
FT-IR spectroscopy was used to investigate the effect of oxidative stress and to approach the mechanism on cancer bone demineralization, aortic valve mineralization and heterotopic ossification on disease development. The FT-IR spectra obtained from paediatric, adult bone and ex vivo irradiated adult healthy bone with a dose of 20Gy were compared with those of healthy bone. The increase of band intensity changes of vasCH2,vsCH2 in the region 3000-2850cm-1 depended on aging, the disease progression and the dose of irradiation. The bands at 3080cm-1 and 1744cm-1, which originate from olefinic terminal bond (v=CH) and ester carbonyl group (vROCO), respectively, indicate the influence of oxidative stress on lipid degradation and peroxidation, respectively. The new bands at about 1690cm-1 and 1516cm-1 denote the presence of β-sheet conformation of the proteins due to the diseases, confirming the increasing amount of lipophilic environment and fibril formation. Comparison of the FT-IR spectra of calcified aortic valve and hip heterotopic ossification with that of normal bones showed that in the bone-like formation the peroxide anion free radicals play an important role in the disease.
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6
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Su JF, Cheng C, Ma F, Huang TL, Lu JS, Shao SC. Kinetic analysis of Fe 3+reduction coupled with nitrate removal by Klebsiella sp. FC61 under different conditions. RSC Adv 2016. [DOI: 10.1039/c6ra08216e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Klebsiellasp. FC61, a newly found iron-reducing bacterium, has the ability of simultaneously reducing Fe3+and nitrate under different pH and temperature conditions.
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Affiliation(s)
- Jun feng Su
- School of Environmental and Municipal Engineering
- Xi'an University of Architecture and Technology
- Xi'an 710055
- China
- State Key Laboratory of Urban Water Resource and Environment
| | - Ce Cheng
- School of Environmental and Municipal Engineering
- Xi'an University of Architecture and Technology
- Xi'an 710055
- China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- China
| | - Ting lin Huang
- School of Environmental and Municipal Engineering
- Xi'an University of Architecture and Technology
- Xi'an 710055
- China
| | - Jin suo Lu
- School of Environmental and Municipal Engineering
- Xi'an University of Architecture and Technology
- Xi'an 710055
- China
| | - Si cheng Shao
- School of Environmental and Municipal Engineering
- Xi'an University of Architecture and Technology
- Xi'an 710055
- China
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7
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Schweitzer MH, Zheng W, Cleland TP, Goodwin MB, Boatman E, Theil E, Marcus MA, Fakra SC. A role for iron and oxygen chemistry in preserving soft tissues, cells and molecules from deep time. Proc Biol Sci 2014; 281:20132741. [PMID: 24285202 PMCID: PMC3866414 DOI: 10.1098/rspb.2013.2741] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 10/29/2013] [Indexed: 01/15/2023] Open
Abstract
The persistence of original soft tissues in Mesozoic fossil bone is not explained by current chemical degradation models. We identified iron particles (goethite-αFeO(OH)) associated with soft tissues recovered from two Mesozoic dinosaurs, using transmission electron microscopy, electron energy loss spectroscopy, micro-X-ray diffraction and Fe micro-X-ray absorption near-edge structure. Iron chelators increased fossil tissue immunoreactivity to multiple antibodies dramatically, suggesting a role for iron in both preserving and masking proteins in fossil tissues. Haemoglobin (HB) increased tissue stability more than 200-fold, from approximately 3 days to more than two years at room temperature (25°C) in an ostrich blood vessel model developed to test post-mortem 'tissue fixation' by cross-linking or peroxidation. HB-induced solution hypoxia coupled with iron chelation enhances preservation as follows: HB + O2 > HB - O2 > -O2 >> +O2. The well-known O2/haeme interactions in the chemistry of life, such as respiration and bioenergetics, are complemented by O2/haeme interactions in the preservation of fossil soft tissues.
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Affiliation(s)
- Mary H. Schweitzer
- Marine, Earth, and Atmospheric Sciences, North Carolina State University, Campus Box 8208, Raleigh, NC 27695, USA
- North Carolina Museum of Natural Sciences, 11 West Jones Street, Raleigh, NC 27601, USA
| | - Wenxia Zheng
- Marine, Earth, and Atmospheric Sciences, North Carolina State University, Campus Box 8208, Raleigh, NC 27695, USA
| | - Timothy P. Cleland
- Marine, Earth, and Atmospheric Sciences, North Carolina State University, Campus Box 8208, Raleigh, NC 27695, USA
| | - Mark B. Goodwin
- Museum of Paleontology, University of California, Berkeley, CA 94720, USA
| | - Elizabeth Boatman
- Department of Material Sciences and Engineering, University of California, Berkeley, CA 94720, USA
| | - Elizabeth Theil
- CHORI (Children's Hospital Oakland Research Institute), 5700 Martin Luther King, Jr. Way, Oakland, CA 94609, USA
- Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, NC 27695-7622, USA
| | - Matthew A. Marcus
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Sirine C. Fakra
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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8
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Wan JH, Tian PL, Yin H, Han Y, Wei XC, Pan T. A preliminary evaluation of attenuated total reflection Fourier transform infrared spectroscopy for the hematological analysis of thalassemias. Clin Biochem 2013; 46:128-32. [DOI: 10.1016/j.clinbiochem.2012.10.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 09/06/2012] [Accepted: 10/01/2012] [Indexed: 10/27/2022]
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9
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Kavukcuoglu NB, Li Q, Pleshko N, Uitto J. Connective tissue mineralization in Abcc6-/- mice, a model for pseudoxanthoma elasticum. Matrix Biol 2012; 31:246-52. [PMID: 22421595 DOI: 10.1016/j.matbio.2012.02.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 02/20/2012] [Accepted: 02/22/2012] [Indexed: 02/03/2023]
Abstract
Pseudoxanthoma elasticum (PXE) is a heritable multisystem disorder characterized by ectopic mineralization. However, the structure of the mineral deposits, their interactions with the connective tissue matrix, and the details of the progressive maturation of the mineral crystals are currently unknown. In this study, we examined the mineralization processes in Abcc6(-/-) mice, a model system for PXE, by energy dispersive X-ray and Fourier transform infrared imaging spectroscopy (FT-IRIS). The results indicated that the principal components of the mineral deposits were calcium and phosphate which co-localized within the histologically demonstrable lesions determined by topographic mapping. The Ca/P ratio increased in samples with progressive mineralization reaching the value comparable to that in endochondral bone. A progressive increase in mineralization was also reflected by increased mineral-to-matrix ratio determined by FT-IRIS. Determination of the mineral phases by FT-IRIS suggested progressive maturation of the mineral deposits from amorphous calcium phosphate to hydroxyapatite. These results provide critical information of the mechanisms of mineralization in PXE, with potential pharmacologic implications.
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Affiliation(s)
- N Beril Kavukcuoglu
- Department of Bioengineering, Temple University, Philadelphia, PA 19122, USA
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10
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Study on the modulating effect of polysaccharide upon the mineralization of iron hydroxide. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/s11631-008-0150-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Song R, Lin W, Chen Q, Asakura T, Wehrli FW, Song HK. Relationships between MR transverse relaxation parameters R*(2), R(2) and R'(2) and hepatic iron content in thalassemic mice at 1.5 T and 3 T. NMR IN BIOMEDICINE 2008; 21:574-580. [PMID: 18041805 DOI: 10.1002/nbm.1227] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Assessment of hepatic iron concentration is important in the management of patients with thalassemia. The goal of this study was to investigate the relationships between the three MR transverse relaxation rates, R*(2), R(2) and R'(2), and hepatic iron content in a mouse model of thalassemia at 1.5 and 3 T field strengths. A GESFIDE (gradient-echo sampling of free induction decay and echo) pulse sequence was used to measure the three parameters efficiently in a single scan in a study examining the livers of normal and thalassemic mice, including a subgroup of the latter that were subjected to periodic transfusions. The results showed that R*(2), R(2) and R'(2) all correlated closely with liver iron concentration at both 1.5 T and 3 T, with correlation coefficients ranging from 0.72 to 0.79. High degrees of correlation (r = 0.93-0.99) were also observed among the three MR parameters at both field strengths. It can be concluded that the three rates could all be effective for assessing hepatic iron concentration and that imaging at higher fields may not offer any advantages over that at lower fields.
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Affiliation(s)
- Ruitian Song
- Laboratory for Structural NMR Imaging, Department of Radiology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
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12
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Clemente-León M, Coronado E, Soriano-Portillo A, Martín-Romero M, Pérez-Morales M, Domínguez-Vera J, Gálvez N. Langmuir monolayers and Langmuir–Blodgett films of ferritin prepared by using a surfactant mixture of eicosylamine (EA) and methyl stearate (SME). Polyhedron 2007. [DOI: 10.1016/j.poly.2006.09.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Clemente-León M, Coronado E, Soriano-Portillo A, Colacio E, Domínguez-Vera JM, Galvez N, Madueño R, Martín-Romero MT. Magnetic Langmuir-Blodgett films of ferritin with different iron contents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:6993-7000. [PMID: 16863250 DOI: 10.1021/la061284p] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Magnetic Langmuir-Blodgett films of four ferritin derivatives with different iron contents containing 4220, 3062, 2200, and 1200 iron atoms, respectively, have been prepared by using the adsorption properties of a 6/1 mixed monolayer of methyl stearate (SME) and dioctadecyldimethylammonium bromide (DODA). The molecular organization of the mixed SME/DODA monolayer is strongly affected by the presence of the water-soluble protein in the subphase as shown by pi-A isotherms, BAM images, and imaging ellipsometry at the water-air interface. BAM images reveal the heterogeneity of this mixed monolayer at the air-water interface. We propose that the ferritin is located under the mixed matrix in those regions where the reflectivity is higher whereas the dark regions correspond to the matrix. Ellipsometric angle measurements performed in zones of different brightness of the mixed monolayer confirm such a heterogeneous distribution of the protein under the lipid matrix. Transfer of the monolayer onto different substrates allowed the preparation of multilayer LB films of ferritin. Both infrared and UV-vis spectroscopy indicate that ferritin molecules are incorporated within the LB films. AFM measurements show that the heterogeneous distribution of the ferritin at the water-air interface is maintained when it is transferred onto solid substrates. Magnetic measurements show that the superparamagnetic properties of these molecules are preserved. Thus, marked hysteresis loops of magnetization are obtained below 20 K with coercive fields that depend on the number of iron atoms of the ferritin derivative.
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Affiliation(s)
- Miguel Clemente-León
- Instituto de Ciencia Molecular, Universidad de Valencia, Polígono de la Coma s/n, 46980 Paterna, Spain.
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14
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Sheth S, Tang H, Jensen JH, Altmann K, Prakash A, Printz BF, Hordof AJ, Tosti CL, Azabagic A, Swaminathan S, Brown TR, Olivieri NF, Brittenham GM. Methods for noninvasive measurement of tissue iron in Cooley's anemia. Ann N Y Acad Sci 2006; 1054:358-72. [PMID: 16339684 DOI: 10.1196/annals.1345.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
To examine the relationship between myocardial storage iron and body iron burden, as assessed by hepatic storage iron measurements, we studied 22 patients with transfusion-dependent thalassemia syndromes, all being treated with subcutaneous deferoxamine, and 6 healthy subjects. Study participants were examined with a Philips 1.5-T Intera scanner using three multiecho spin echo sequences with electrocardiographic triggering and respiratory navigator gating. Myocardial and hepatic storage iron concentrations were determined using a new magnetic resonance method that estimates total tissue iron stores by separately measuring the two principal forms of storage iron, ferritin and hemosiderin. In a subset of 10 patients with beta-thalassemia major, the hepatic storage iron concentration had been monitored repeatedly for 12-14 years by chemical analysis of tissue obtained by liver biopsy and by magnetic susceptometry. In this subset, we examine the relationship between hepatic iron concentration over time and our current magnetic resonance estimates of myocardial iron stores. No significant relationship was found between simultaneous estimates of myocardial and hepatic storage iron concentrations. By contrast, in the subset of 10 patients with beta-thalassemia major, the correlation between the 5-year average of hepatic iron concentration and the current myocardial storage iron was significant (R = .67, P = .03). In these patients, myocardial storage iron concentrations seem to reflect the control of body iron over a period of years. Magnetic resonance methods promise to provide more effective monitoring of iron deposition in vulnerable tissues, including the liver, heart, and endocrine organs, and could contribute to the development of iron-chelating regimens that more effectively prevent iron toxicity.
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Affiliation(s)
- Sujit Sheth
- Department of Pediatrics, Columbia University College of Physicians and Surgeons, Harkness Pavilion, Room HP5, 180 Fort Washington Avenue, New York, NY 10032, USA.
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15
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Suber L, Foglia S, Fiorani D, Romero H, Montone A, Roig A, Casas L. Synthesis, morphological–structural characterization and magnetic properties of amorphous iron (III)-oxyhydroxy-phosphate nanoparticles. J SOLID STATE CHEM 2004. [DOI: 10.1016/j.jssc.2004.03.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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16
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Anderson D, Yardley-Jones A, Vives-Bauza C, Chua-Anusorn W, Cole C, Webb J. Effect of iron salts, haemosiderins, and chelating agents on the lymphocytes of a thalassaemia patient without chelation therapy as measured in the comet assay. TERATOGENESIS, CARCINOGENESIS, AND MUTAGENESIS 2001; 20:251-64. [PMID: 10992272 DOI: 10.1002/1520-6866(2000)20:5<251::aid-tcm1>3.0.co;2-f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Impairment of haemoglobin synthesis occurs in the genetic diseases known as thalassaemia. The consequent chronic anaemia leads to increased dietary iron absorption which results in iron overload. Treatment through regular blood transfusions increases oxygen capacity, but also adds iron from haemoglobin. An essential treatment, in parallel with transfusions, is the use of chelating agents to remove the excess iron. Thalassaemia patients are particularly at risk of free radical damage. Human lymphocytes from normal individuals can be investigated in vitro as a model system in the presence of free radicals in the Comet assay. This assay measures DNA damage, particularly DNA strand breakage. We examined cells from an Australian thalassaemic patient (sickle/beta thal double heterozygote-sickle phenotype) who had not yet received chelation therapy to determine if the cells were more sensitive to simulated iron overload and to haemosiderins. Lymphocytes from the patient were received as frozen samples after 28 h on dry ice and then placed in liquid nitrogen. Normal lymphocytes frozen under the same conditions and normal nonfrozen lymphocytes were compared. The lymphocytes from a normal female did not respond in vitro to ferric chloride (FeCl(3)) or haemosiderin but did to ferrous chloride (FeCl(2)) and ferrous sulphate (FeSO(4)). Deferoxamine appeared to reduce the response to FeCl(2) and FeSO(4) but deferiprone did not. When the lymphocytes from the nonchelated patient were treated with FeSO(4) and hydrogen peroxide, deferoxamine and deferiprone both reduced the response. Over the same dose range of iron salt (FeSO(4)), the lymphocytes from the thalassaemic patient were more sensitive, with much higher background levels of damage and induced damage. When deferiprone and deferoxamine were compared over a nontoxic range, deferiprone appeared to produce a greater reduction of damage in lymphocytes of the thalassaemia patient. Ferritin iron appears to be more available than haemosiderin iron in reactions leading to DNA damage. Haemosiderin containing higher amounts of the goethite-like (alpha-FeOOH) iron oxide phase leads to lower levels of DNA damage.
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Affiliation(s)
- D Anderson
- TNO BIBRA International Ltd, Carshalton, Surrey, UK
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