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Hosseini SM, Mohammadnejad J, Yousefnia H, Alirezapour B, Rezayan AH. Development of 177Lu-Cetuximab-PAMAM dendrimeric nanosystem: a novel theranostic radioimmunoconjugate. J Cancer Res Clin Oncol 2023; 149:7779-7791. [PMID: 37029816 DOI: 10.1007/s00432-023-04724-z] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 03/22/2023] [Indexed: 04/09/2023]
Abstract
PURPOSE Epidermal growth factor receptors (EGFRs) are overexpressed in a wide range of tumors and are attractive candidates to target in targeted therapies. This study aimed to introduce a novel radiolabeled compound, 177Lu-cetuximab-PAMAM G4, for the treatment of EGFR-expressing tumors. METHODS In this study, the cetuximab mAb was bound to PAMAM G4 and labeled with 177Lu via DTPA-CHX chelator. The synthesized nanosystem was confirmed by different analyses such as DLS, FT-IR, TEM, and RT-LC. Cell viability of the radioimmunoconjugate was assessed over the EGFR-expressing cell line of SW480. The biodistribution of 177Lu-Cetuximab-PAMAMG4 was determined in different intervals after injection of the radiolabeled compound in normal and tumoral nude mice via scarification and SPECT images. RESULTS The average size of PAMAM G4 and PAMAM-Cetuximab-DTPA-CHX nanoparticles were 2 and 70 nm, respectively. 177Lu-Cetuximab-PAMAMG4 was prepared with radiochemical purity of more than 98%. The survival rates of SW480 cells at 24, 48, and 72 h post-treatment with177Lu-Cetuximab-PAMAMG4 (500 nM) were 18%, 15%, and 14%, respectively. The biodistribution studies showed a significant accumulation of 177Lu-Cetuximab-PAMAM in the EGFR-expressing tumor. CONCLUSION According to the results, this new agent can be considered as an efficient therapeutic complex for tumors expressing EGFR receptors.
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Affiliation(s)
- Seyed Mohammad Hosseini
- Department of Life Science Engineering, Faculty of Modern Science and Technology, Nano Biotechnology Group, University of Tehran, Tehran, 1439957131, Iran
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, 14155-1339, Iran
| | - Javad Mohammadnejad
- Department of Life Science Engineering, Faculty of Modern Science and Technology, Nano Biotechnology Group, University of Tehran, Tehran, 1439957131, Iran
| | - Hassan Yousefnia
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, 14155-1339, Iran.
| | - Behrouz Alirezapour
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, 14155-1339, Iran
| | - Ali Hossein Rezayan
- Department of Life Science Engineering, Faculty of Modern Science and Technology, Nano Biotechnology Group, University of Tehran, Tehran, 1439957131, Iran
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Dan Y, Wang X, Ji M, Sang W, Shen Z, Zhang Y. Influence of temperature change on the immobilization of soil Pb and Zn by hydrochar: Roles of soil microbial modulation. Environ Pollut 2023; 320:121109. [PMID: 36669718 DOI: 10.1016/j.envpol.2023.121109] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [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: 09/19/2022] [Revised: 01/13/2023] [Accepted: 01/17/2023] [Indexed: 06/17/2023]
Abstract
Considering the potential effect of the ambient temperature on soil microorganisms during heavy metal immobilization by hydrochar, 60 days of soil incubation was conducted to explore the impact of ambient temperature (5, 25, and 35 °C) on the immobilization of Pb and Zn by chitosan-magnetic sawdust hydrochar (CMSH) and magnetic chitosan hydrochar (MCH). The results showed that soil pH was relatively high and total organic carbon (TOC) was slightly lower in the 35 °C treatment. The diethylenetriaminepentaacetic acid (DTPA) available state content decreased significantly with the temperature increasing. Meanwhile, the ratios of stable Pb and Zn in the sequential extraction method proposed by the European Community Bureau of Reference (BCR) gradually increased with increasing temperature. The heatmap based on microbial community showed that elevated temperature not only favored the enrichment of metal-stable phyla, such as Chloroflexi, but was also involved in inhibiting the growth of Firmicutes, Actinobacteriota, and Proteobacteria. Meanwhile, different genera (Fonticella and Bacillus) in the Firmicutes phylum had distinct responses to temperature as well as to heavy metal immobilization effects. Subsequently, redundancy analysis confirmed that Chloroflexi and Fonticella were positively correlated with temperature and stable state metal content, while Actinobacteriota and Bacillus were negatively correlated with temperature and were positively correlated with DTPA available metal content. Moreover, Pb and Zn indicators displayed significant correlations for the dominant genera (R2 > 0.8, p < 0.02).
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Affiliation(s)
- Yitong Dan
- College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Xiaoxia Wang
- College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Mengyuan Ji
- Department of Biology, University of Padua, 35131, Padova, Italy
| | - Wenjing Sang
- College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
| | - Zheng Shen
- Institute of New Rural Development, Tongji University, Shanghai, 200092, China
| | - Yalei Zhang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
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MacPherson DS, Hwang D, Sarrett SM, Keinänen O, Rodriguez C, Rader C, Zeglis BM. Leveraging a Dual Variable Domain Immunoglobulin to Create a Site-Specifically Modified Radioimmunoconjugate. Mol Pharm 2023; 20:775-782. [PMID: 36377696 PMCID: PMC10263003 DOI: 10.1021/acs.molpharmaceut.2c00700] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Site-specifically modified radioimmunoconjugates exhibit superior in vitro and in vivo behavior compared to analogues synthesized via traditional stochastic methods. However, the development of approaches to site-specific bioconjugation that combine high levels of selectivity, simple reaction conditions, and clinical translatability remains a challenge. Herein, we describe a novel solution to this problem: the use of dual-variable domain immunoglobulins (DVD-IgG). More specifically, we report the synthesis, in vitro evaluation, and in vivo validation of a 177Lu-labeled radioimmunoconjugate based on HER2DVD, a DVD-IgG containing the HER2-targeting variable domains of trastuzumab and the catalytic variable domains of IgG h38C2. To this end, we first modified HER2DVD with a phenyloxadiazolyl methlysulfone-modified variant of the chelator CHX-A″-DTPA (PODS-CHX-A''-DTPA) and verified the site-specificity of the conjugation for the reactive lysines within the catalytic domains via chemical assay, MALDI-ToF mass spectrometry, and SDS-PAGE. The chelator-bearing immunoconjugate was subsequently labeled with [177Lu]Lu3+ to produce the completed radioimmunoconjugate, [177Lu]Lu-CHX-A″-DTPAPODS-HER2DVD, in >80% radiochemical conversion and a specific activity of 29.5 ± 7.1 GBq/μmol. [177Lu]Lu-CHX-A″-DTPAPODS-HER2DVD did not form aggregates upon prolonged incubation in human serum, displayed 87% stability to demetalation over a 7 days of incubation in serum, and exhibited an immunoreactive fraction of 0.95 with HER2-coated beads. Finally, we compared the pharmacokinetic profile of [177Lu]Lu-CHX-A″-DTPAPODS-HER2DVD to that of a 177Lu-labeled variant of trastuzumab in mice bearing subcutaneous HER2-expressing BT-474 human breast cancer xenografts. The in vivo performance of [177Lu]Lu-CHX-A″-DTPAPODS-HER2DVD matched that of 177Lu-labeled trastuzumab, with the former producing a tumoral activity concentration of 34.1 ± 12.1 %ID/g at 168 h and tumor-to-blood, tumor-to-liver, and tumor-to-kidney activity concentration ratios of 10.5, 9.6, and 21.8, respectively, at the same time point. Importantly, the DVD-IgG did not exhibit a substantially longer serum half-life than the traditional IgG despite its significantly larger size (202 kDa for the former vs 148 kDa for the latter). Taken together, these data suggest that DVD-IgGs represent a viable platform for the future development of highly effective site-specifically labeled radioimmunoconjugates for diagnostic imaging, theranostic imaging, and radioimmunotherapy.
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Affiliation(s)
- Douglas S. MacPherson
- Department of Chemistry, Hunter College of the City University of New York, 413 East 69th Street, New York, New York 10028, United States
- Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
- Advanced Science Research Center (ASRC) at The Graduate Center, City University of New York, 85 St. Nicholas Terrace, New York, NY 10031, USA
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States
| | - Dobeen Hwang
- Department of Immunology and Microbiology, UF Scripps Biomedical Research, University of Florida, Jupiter, Florida 33458, United States
| | - Samantha M. Sarrett
- Department of Chemistry, Hunter College of the City University of New York, 413 East 69th Street, New York, New York 10028, United States
- Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States
| | - Outi Keinänen
- Department of Chemistry, Hunter College of the City University of New York, 413 East 69th Street, New York, New York 10028, United States
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - Cindy Rodriguez
- Department of Chemistry, Hunter College of the City University of New York, 413 East 69th Street, New York, New York 10028, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States
| | - Christoph Rader
- Department of Immunology and Microbiology, UF Scripps Biomedical Research, University of Florida, Jupiter, Florida 33458, United States
| | - Brian M. Zeglis
- Department of Chemistry, Hunter College of the City University of New York, 413 East 69th Street, New York, New York 10028, United States
- Ph.D. Program in Biochemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
- Department of Radiology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, United States
- Department of Radiology, Weill Cornell Medical College, 520 East 70th Street, New York, New York 10065, United States
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Korsen JA, Gutierrez JA, Tully KM, Carter LM, Samuels ZV, Khitrov S, Poirier JT, Rudin CM, Chen Y, Morris MJ, Bodei L, Pillarsetty N, Lewis JS. Delta-like ligand 3-targeted radioimmunotherapy for neuroendocrine prostate cancer. Proc Natl Acad Sci U S A 2022; 119:e2203820119. [PMID: 35759660 PMCID: PMC9271187 DOI: 10.1073/pnas.2203820119] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 05/23/2022] [Indexed: 12/25/2022] Open
Abstract
Neuroendocrine prostate cancer (NEPC) is a lethal subtype of prostate cancer with limited meaningful treatment options. NEPC lesions uniquely express delta-like ligand 3 (DLL3) on their cell surface. Taking advantage of DLL3 overexpression, we developed and evaluated lutetium-177 (177Lu)-labeled DLL3-targeting antibody SC16 (177Lu-DTPA-SC16) as a treatment for NEPC. SC16 was functionalized with DTPA-CHX-A" chelator and radiolabeled with 177Lu to produce 177Lu-DTPA-SC16. Specificity and selectivity of 177Lu-DTPA-SC16 were evaluated in vitro and in vivo using NCI-H660 (NEPC, DLL3-positive) and DU145 (adenocarcinoma, DLL3-negative) cells and xenografts. Dose-dependent treatment efficacy and specificity of 177Lu-DTPA-SC16 radionuclide therapy were evaluated in H660 and DU145 xenograft-bearing mice. Safety of the agent was assessed by monitoring hematologic parameters. 177Lu-DTPA-SC16 showed high tumor uptake and specificity in H660 xenografts, with minimal uptake in DU145 xenografts. At all three tested doses of 177Lu-DTPA-SC16 (4.63, 9.25, and 27.75 MBq/mouse), complete responses were observed in H660-bearing mice; 9.25 and 27.75 MBq/mouse doses were curative. Even the lowest tested dose proved curative in five (63%) of eight mice, and recurring tumors could be successfully re-treated at the same dose to achieve complete responses. In DU145 xenografts, 177Lu-DTPA-SC16 therapy did not inhibit tumor growth. Platelets and hematocrit transiently dropped, reaching nadir at 2 to 3 wk. This was out of range only in the highest-dose cohort and quickly recovered to normal range by week 4. Weight loss was observed only in the highest-dose cohort. Therefore, our data demonstrate that 177Lu-DTPA-SC16 is a potent and safe radioimmunotherapeutic agent for testing in humans with NEPC.
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Affiliation(s)
- Joshua A. Korsen
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Department of Pharmacology, Weill Cornell Medicine, New York, NY 10021
| | - Julia A. Gutierrez
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Kathryn M. Tully
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Department of Pharmacology, Weill Cornell Medicine, New York, NY 10021
| | - Lukas M. Carter
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Zachary V. Samuels
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Samantha Khitrov
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - John T. Poirier
- Perlmutter Cancer Center, New York University Langone Health, New York, NY 10016
| | - Charles M. Rudin
- Department of Pharmacology, Weill Cornell Medicine, New York, NY 10021
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Yu Chen
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | - Michael J. Morris
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Department of Medicine, Weill Cornell Medicine, New York, NY 10021
| | - Lisa Bodei
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
| | | | - Jason S. Lewis
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY 10065
- Department of Pharmacology, Weill Cornell Medicine, New York, NY 10021
- Molecular Pharmacology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065
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5
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Mussarat M, Jamal WA, Muhammad D, Ahmad M, Saleem A, Khan S, Aman F, Bibi H, Shah WA, Dawar K, Akbar NU, Mian IA, Waheed M, Ali I, Zia A, Malik W. Risk of heavy metals accumulation in soil and wheat grains with waste water irrigation under different NPK levels in alkaline calcareous soil. PLoS One 2021; 16:e0258724. [PMID: 34788291 PMCID: PMC8598069 DOI: 10.1371/journal.pone.0258724] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 10/04/2021] [Indexed: 11/25/2022] Open
Abstract
A field study was conducted on the reuse of wastewater from Mardan city to evaluate its risk of contaminating soil and wheat grains at different NPK levels. Three irrigation sources i.e. waste water (WW), canal water (CW) and alternate waste + canal water (WW+CW) were applied to wheat (cv Atta Habib 2010) grown at 0, 50, 75 and 100% NPK levels of 120:90:60 kg N:P2O5:K2O ha-1 at Palatoo Research Farm, Amir Muhammad Khan Campus, Mardan during 2015.The results showed higher grain and biomass yields in WW irrigated plots as compared to CW at NPK levels up to 50% of recommending dose revealing supplementing nutrient requirements in deficient conditions. However, irrigation of WW at higher NPK levels especially at or beyond 75% of recommended dose tended to reduce the crop yield that could be associated with heavy metals toxicity and nutritional imbalances. The use of WW substantially increased AB-DTPA extractable Zn, Mn, Pb, Ni and Cd indicating a potential threat to soil contamination. Similarly, WW irrigated wheat had higher concentrations of these heavy metals as compared to CW which limits its use for production purposes without any remediation measures. The alternate use of CW and WW as revealed by its comparative lower contamination in soil and wheat than sole WW could be one of the possible solutions and may increase the time required for threshold soil contamination.
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Affiliation(s)
- Maria Mussarat
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
- * E-mail:
| | - Waqar Ahmad Jamal
- Department of Soil and Environmental Sciences, Amir Muhammad Khan Campus, The University of Agriculture, Peshawar, Pakistan
| | - Dost Muhammad
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Manzoor Ahmad
- Department of Agriculture, Bacha Khan University, Charsadda, Khyber Pakhtunkhwa, Pakistan
| | - Abida Saleem
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Sowm Khan
- Directorate General of Soil Water Conservation, Peshawar, Pakistan
| | - Faiza Aman
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Hamida Bibi
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Wajid Ali Shah
- Directorate General of Soil Water Conservation, Peshawar, Pakistan
| | - Khadim Dawar
- Directorate General of Soil Water Conservation, Peshawar, Pakistan
| | - Noor ul Akbar
- Department of Zoology, Kohat University of Science and Technology, Kohat, Pakistan
| | - Ishaq Ahmad Mian
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Muhammad Waheed
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Irshad Ali
- Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar, Pakistan
| | - Afia Zia
- Department of Agricultural Chemistry, The University of Agriculture, Peshawar, Pakistan
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Xiao J, Park YG, Guo G, Jeong BR. Effect of Iron Source and Medium pH on Growth and Development of Sorbus commixta In Vitro. Int J Mol Sci 2020; 22:ijms22010133. [PMID: 33374479 PMCID: PMC7796064 DOI: 10.3390/ijms22010133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 12/14/2020] [Accepted: 12/22/2020] [Indexed: 11/16/2022] Open
Abstract
Sorbus commixta is a valuable hardwood plant with a high economical value for its medicinal and ornamental qualities. The aim of this work was to investigate the effects of the iron (Fe) source and medium pH on the growth and development of S. commixta in vitro. The Fe sources used, including non-chelated iron sulfate (FeSO4), iron ethylenediaminetetraacetic acid (Fe-EDTA), and iron diethylenetriaminepentaacetic acid (Fe-DTPA), were supplemented to the Multipurpose medium with a final Fe concentration of 2.78 mg·L-1. The medium without any supplementary Fe was used as the control. The pH of the agar-solidified medium was adjusted to either 4.70, 5.70, or 6.70. The experiment was conducted in a culture room for six weeks with 25 °C day and night temperatures, and a 16-h photoperiod with a light intensity of 50 mmol·m-2·s-1 photosynthetic photon flux density (PPFD). Both the Fe source and pH affected the growth and development of the micropropagated plants in vitro. The leaves were greener in the pH 4.70 and 5.70 treatments. The tissue Fe content decreased with the increase of the medium pH. The leaf chlorophyll content was similar between plants treated with FeSO4 and those with Fe-EDTA. The numbers of the shoots and roots of plantlets treated with FeSO4 were 2.5 and 2 times greater than those of the control, respectively. The fresh and dry weights of the shoot and the root were the greatest for plants treated with Fe-EDTA combined with pH 5.70. The calcium, magnesium, and manganese contents in the plantlets increased in the pH 5.70 treatments regardless of the Fe source. Supplementary Fe decreased the activity of ferric chelate reductase. Overall, although the plantlets absorbed more Fe at pH 4.70, Fe-EDTA combined with pH 5.70 was found to be the best for the growth and development of S. commixta in vitro.
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Affiliation(s)
- Jie Xiao
- Department of Horticulture, Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University, Jinju 52828, Korea; (J.X.); (G.G.)
| | - Yoo Gyeong Park
- Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea;
| | - Ge Guo
- Department of Horticulture, Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University, Jinju 52828, Korea; (J.X.); (G.G.)
| | - Byoung Ryong Jeong
- Department of Horticulture, Division of Applied Life Science (BK21 Program), Graduate School of Gyeongsang National University, Jinju 52828, Korea; (J.X.); (G.G.)
- Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea;
- Research Institute of Life Science, Gyeongsang National University, Jinju 52828, Korea
- Correspondence: ; Tel.: +82-55-772-1913
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Chen JL, Li B, Li XY, Su XC. Dynamic Exchange of the Metal Chelating Moiety: A Key Factor in Determining the Rigidity of Protein-Tag Conjugates in Paramagnetic NMR. J Phys Chem Lett 2020; 11:9493-9500. [PMID: 33108729 DOI: 10.1021/acs.jpclett.0c02196] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 06/11/2023]
Abstract
Site-specific labeling of proteins with a paramagnetic tag is an efficient way to provide atomic-resolution information about the dynamics, interactions, and structures of the proteins and protein-ligand complexes. The paramagnetic effects manifested in NMR spectroscopy generally contain paramagnetic relaxation enhancement, pseudocontact shifts (PCSs), and residual dipolar coupling (RDC), and these effects correlate closely with the flexibility of protein-tag conjugates. The rigidity of the paramagnetic tag is greatly important in decoding the structural details of macromolecular complexes, because paramagnetic averaging reduces the PCSs and RDCs. Here we show that the dynamic exchange of the metal chelating moiety is a key factor in determining the rigidity of the paramagnetic tag in the protein conjugates. Decreasing the conformational exchange rates in the metal chelating moiety greatly minimizes the paramagnetic averaging and thus increases PCSs and RDCs. This effect has been demonstrated in an open-chain tag, Py-l-Cys-DTPA, which generates large PCSs and RDCs that are comparable to those of the reported cyclic DOTA-like tags. The proposed route offers a unique way to design suitable paramagnetic tags for applications in biological systems.
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Affiliation(s)
- Jia-Liang Chen
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Bin Li
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xia-Yan Li
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
| | - Xun-Cheng Su
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
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8
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Tsai WTK, Zettlitz KA, Dahlbom M, Reiter RE, Wu AM. Evaluation of [ 131I]I- and [ 177Lu]Lu-DTPA-A11 Minibody for Radioimmunotherapy in a Preclinical Model of PSCA-Expressing Prostate Cancer. Mol Imaging Biol 2020; 22:1380-1391. [PMID: 32661830 PMCID: PMC7688013 DOI: 10.1007/s11307-020-01518-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
PURPOSE Radioimmunotherapy uses tumor-specific antibodies to deliver therapeutic radionuclides, but hematological toxicity due to the long serum half-life of intact antibodies remains a challenge. We evaluated a smaller antibody fragment, the minibody, with faster kinetics and a potentially improved therapeutic index. PROCEDURES The anti-prostate stem cell antigen (PSCA) minibody (A11 Mb) was radiolabeled with iodine-124 ([124I]I-A11 Mb) or conjugated with deferoxamine (DFO) and labeled with zirconium-89 ([89Zr]Zr-DFO-A11 Mb) for surrogate immunoPET to profile pharmacokinetics in a human prostate cancer xenograft model. Subsequently, minibodies labeled with two therapeutic beta emitters, directly iodinated [131I]I-A11 Mb (non-residualizing) and 177Lu chelated using DTPA ([177Lu]Lu-DTPA-A11 Mb) (residualizing), were compared for in vitro antigen-specific cytotoxicity. Full biodistribution studies (in 22Rv1-PSCA tumor bearing and hPSCA knock-in mice) were conducted for dosimetry calculations. Finally, the lead candidate [131I]I-A11 Mb was evaluated in a radioimmunotherapy experiment. Escalating single doses (3.7, 11, or 37 MBq) and saline control were administered to 22Rv1-PSCA tumor bearing mice and anti-tumor effects (tumor volume) and toxicity (body weight) were monitored. RESULTS Minibodies radiolabeled with therapeutic beta emitters [131I]I-A11 Mb and [177Lu]Lu-DTPA-A11 Mb exhibited comparable tumor cell growth inhibition in vitro. In vivo surrogate immunoPET imaging using [89Zr]Zr-DFO-A11 Mb showed activity retention in liver and kidney up to 72 h, while [124I]I-A11 Mb cleared from liver, kidney, and blood by 48 h. Based on full biodistribution and dosimetry calculations, administering 37 MBq [131I]I-A11 Mb was predicted to deliver a favorable dose to the tumor (35 Gy), with a therapeutic index of 22 (tumor:bone marrow). For [177Lu]Lu-DTPA-A11 Mb, the kidneys would be dose-limiting, and the maximum tolerated activity (7.4 MBq) was not predicted to deliver an effective radiation dose to tumor. Radioimmunotherapy with a single dose of [131I]I-A11 Mb showed dose-dependent tumor inhibition with minimal off-target toxicity and improved median survival (19 and 24 days, P < 0.001) compared with untreated mice (12 days). CONCLUSIONS These findings show the potential of the anti-PSCA minibody for targeted radioimmunotherapy with minimal toxicity, and the application of immunoPET and dosimetry for personalized treatment.
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Affiliation(s)
- Wen-Ting K Tsai
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine, UC Los Angeles, Los Angeles, CA, USA
- Antibody Engineering, Genentech, South San Francisco, CA, USA
| | - Kirstin A Zettlitz
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine, UC Los Angeles, Los Angeles, CA, USA
- Department of Molecular Imaging and Therapy, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Magnus Dahlbom
- Department of Molecular and Medical Pharmacology, Ahmanson Translational Imaging Division, David Geffen School of Medicine, UC Los Angeles, Los Angeles, CA, USA
| | - Robert E Reiter
- Department of Urology, David Geffen School of Medicine, UC Los Angeles, Los Angeles, CA, USA
| | - Anna M Wu
- Department of Molecular and Medical Pharmacology, Crump Institute for Molecular Imaging, David Geffen School of Medicine, UC Los Angeles, Los Angeles, CA, USA.
- Department of Molecular Imaging and Therapy, Beckman Research Institute, City of Hope, Duarte, CA, USA.
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Xiao L, Li MH, Dai J, Motelica-Heino M, Chen XF, Wu JL, Zhao L, Liu K, Zhang C. Assessment of earthworm activity on Cu, Cd, Pb and Zn bioavailability in contaminated soils using biota to soil accumulation factor and DTPA extraction. Ecotoxicol Environ Saf 2020; 195:110513. [PMID: 32213370 DOI: 10.1016/j.ecoenv.2020.110513] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 02/10/2020] [Revised: 03/16/2020] [Accepted: 03/17/2020] [Indexed: 06/10/2023]
Abstract
The study aims to investigate effect of earthworm activity on metal bioavailability in soils using their BSAF-metals. Based on a microcosmic laboratory experiment, epigeic species Amynthas corticis (A. corticis) and endogeic species Amynthas robustus (A. robustus) were cultured in two types of soils contaminated by Cd, Zn, Pb and Cu for 120 days. Earthworm characteristics (i.e. numbers, biomass and BSAF), soil properties (i.e. pH, organic C and N contents along with their components such as mineralization and microbial masses) and DTPA extracted metals in soil were determined. After the incubation, the biomass and survival numbers of both earthworm species decreased significantly (P < 0.05). The accumulation of Cd, Zn and Pb in earthworm tissues and BSAF-metals were earthworm species dependent. According to two-way ANOVA, BSAF-Pb clearly showed the effect of different species of earthworms while BSAF-Cu indicated an interactive effect of earthworms and soil type. Earthworms changed soil properties significantly, especially for mineralized C (Cmin), dissolved N (Ndis) and pH (P < 0.05). Earthworm activity increase DTPA extracted Zn and Cu, and the effect of A. robustus were stronger than for A. corticis. Redundancy analysis (RDA) showed that BSAF-Cu and BSAF-Pb contributed for respectively 51.9% and 51.7% of soil properties and DTPA metal changes, indicating that the effects of BSAF-Cu and BSAF-Pb on soil properties and on metal bioavailability in soil were similar. BSAF-Cu, indicating the interactive effect of earthworms and soil, accounted for 38.5% and 45.1% of soil properties and soil metal bioavailability changes. BSAF-Pb, representing the effect of earthworm species, accounted for 13.3% and 6.6% of soil property and soil metal bioavailability variations. Stepwise regression indicated that earthworm might change soil properties through their activities and interactions with soil, and hence increase heavy metal bioavailability. It suggested that BSAF is an important indicator for evaluating the effect of earthworm activity on soil metal bioavailability and designing remediation strategies.
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Affiliation(s)
- Ling Xiao
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China; ISTO, UMR 7327, CNRS-Université D'Orléans, 41071, Orléans, France
| | - Ming-Hui Li
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China
| | - Jun Dai
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China.
| | | | - Xu-Fei Chen
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China; Land Development and Reserve Bureau of Guangdong Province, 510635, Guangzhou, China
| | - Jia-Long Wu
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China; Land Development and Reserve Bureau of Guangdong Province, 510635, Guangzhou, China
| | - Lanfeng Zhao
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China
| | - Kexue Liu
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China
| | - Chi Zhang
- Key Laboratory of the Ministry of Agriculture for Arable Land Conservation in South China, Key Laboratory of Guangdong Province for Land Use and Consolidation, College of Natural Resources and Environment, South China Agricultural University, 510642, Guangzhou, China; ISTO, UMR 7327, CNRS-Université D'Orléans, 41071, Orléans, France.
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10
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Zhu N, Zhang B, Yu Q. Genetic Engineering-Facilitated Coassembly of Synthetic Bacterial Cells and Magnetic Nanoparticles for Efficient Heavy Metal Removal. ACS Appl Mater Interfaces 2020; 12:22948-22957. [PMID: 32338492 DOI: 10.1021/acsami.0c04512] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Heavy-metal pollution is becoming a worldwide problem severely threatening our health and ecosystem. In this study, we constructed a genetic-engineering-driven coassembly of synthetic bacterial cells and magnetic nanoparticles (MNPs) for capturing heavy metals. The Escherichia coli cells were genetically engineered by introducing a de novo synthetic heavy-metal-capturing gene (encoding a protein SynHMB containing a six-histidine tag, two cystine-rich peptides, and a metallothionein sequence) and a synthetic type VI secretory system (T6SS) cluster of Pseudomonas putida, endowing the synthetic cells (SynEc2) with high ability of displaying the heavy-metal-capturing SynHMB on cell surface. MNPs were synthesized by a coprecipitation method and further modified by polyethylenimine (PEI) and diethylenetriaminepentaacetic acid (DTPA). Owing to the surface exposure of six-histidine tag on the synthetic bacteria and carboxyl groups on the modified MNPs (MNP@SiO2-PEI-DTPA), the synthetic bacterial cells and MNPs coassembled to form biotic/abiotic complex exhibiting a self-developing characteristic. In the culture medium containing both Cd2+ and Pb2+, the coassemblies captured these heavy metals with high removal efficiency (>90% even at 50 mg/L of Cd2+ and 50 mg/L of Pb2+) and were conveniently recycled by artificial magnetic fields. Moreover, the coassemblies realized coremoval of organic carbon pollutants with the removal efficiency of >80%. This study builds a novel biotic/abiotic coassembling platform facilitated by genetic engineering and sheds light on development of artificial magnetic biological systems for efficient treatment of environmental pollution.
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Affiliation(s)
- Nali Zhu
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, P. R. China
| | - Bing Zhang
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Qilin Yu
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Department of Microbiology, College of Life Sciences, Nankai University, Tianjin 300071, P. R. China
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11
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Ivošev V, Sánchez GJ, Stefancikova L, Haidar DA, González Vargas CR, Yang X, Bazzi R, Porcel E, Roux S, Lacombe S. Uptake and excretion dynamics of gold nanoparticles in cancer cells and fibroblasts. Nanotechnology 2020; 31:135102. [PMID: 31783387 DOI: 10.1088/1361-6528/ab5d82] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Radiotherapy is one of the main treatments used to fight cancer. A major limitation of this modality is the lack of selectivity between cancerous and healthy tissues. One of the most promising strategies proposed in this last decade is the addition of nanoparticles with high-atomic number to enhance radiation effects in tumors. Gold nanoparticles (AuNPs) are considered as one of the best candidates because of their high radioenhancing property, simple synthesis and low toxicity. Ultra small AuNPs (core size of 2.4 nm and hydrodynamic diameter of 4.5 nm) covered with dithiolated diethylenetriaminepentaacetic acid (Au@DTDTPA) are of high interest because of their properties to bind MRI active or PET active compounds at their surface, to concentrate in some tumors and be eliminated via renal clearance thanks to their small size. These key figures make Au@DTDTPA the best candidate to develop image-guided radiotherapy. Surprisingly the capacity of the nanoparticles to penetrate cells, an important issue to predict radioenhancement, has not been established yet. Here, we report the uptake dynamics, internalization routes and excretion dynamics of Au@DTDTPA nanoparticles in various cancer cell lines including glioblastoma (U87-MG), chordoma (UM-Chor1), cervix (HeLa), prostate (PC3), and pancreatic (BxPC-3) cell lines as well as fibroblasts (Dermal fibroblasts). This study demonstrates a strong cell line dependence of the nanoparticle uptake and excretion dynamics. Different pathways of cell internalization evidenced here explain this dependence. As a major finding, the retention of Au@DTDTPA nanoparticles was found to be higher in cancer cells than in fibroblasts. This result strengthens the strategy of using nanoagents to improve tumor selectivity of radiation treatments. In particular Au@DTDTPA nanoparticles are good candidates to improve the treatment of radioresitant gliobastoma, pancreatic and prostate cancer in particular. In conclusion, the variability of cell-to-nanoparticle interaction is a new parameter to consider in the choice of nanoagents in a combined treatment.
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Affiliation(s)
- Vladimir Ivošev
- ISMO (UMR 8214), University Paris-Saclay, University Paris Sud, CNRS, F-91405 Orsay Cedex, France
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12
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Wu M, Zhang Y, Zhuo N, Wu M, Ye Z, Zhang X. DTPAA-Gd Functionalized Ultrasmall Au 15NCs Nanohybrids for Multimodal Imaging. Int J Nanomedicine 2020; 15:227-238. [PMID: 32021176 PMCID: PMC6969685 DOI: 10.2147/ijn.s227169] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 12/28/2019] [Indexed: 11/23/2022] Open
Abstract
INTRODUCTION Multimodal imaging agent has the potential to overcome the shortage and incorporate the advantages of different imaging tools for extremely sensitive diagnosis. To achieve multimodal imaging, combining multiple contrast agents into a special nanostructure has become a main strategy; However, the combination of all of these functions into one nanoplatform usually requires a complicated synthetic procedure that results in heterogeneous nanostructure. METHODS In this study, we develop ultrasmall gold nanoclusters with 15 gold atoms (Au15NCs) functionalized with diethylenetriamine-pentaacetic acid dianhydride (DTPAA-Gd) as an optimized multimodal imaging agent to enhance imaging ability. RESULTS The Au15NCs-DTPAA-Gd nanohybrids possess the ultra-small size and are capable of enhancing the contrast in near-infrared fluorescence (NIRF), magnetic resonance (MR) and X-ray computed tomography (CT) imaging. Meanwhile, the integrated DTPAA-Gd component not only endow the nanohybrids to produce higher T1 relaxivity (r1 = 21.4 mM-1 s-1) than Omnipaque (r1 = 3.973 mM-1s-1) but also further enhance X-ray attenuation property of Au15NCs. Importantly, the fluorescence intensity of Au15NCs-DTPAA-Gd did not decrease compared with Au15NCs. Ultimately, in vivo imaging experiments have demonstrated that Au15NCs-DTPAA-Gd nanohybrids can be quickly eliminated from the body through the urinary system and has great potential for anatomical imaging. CONCLUSION These data manifest Au15NCs-DTPAA-Gd present great potential as a multimodal contrast agent for disease diagnosis, especially for early accurate detection of tumors.
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Affiliation(s)
- Minghao Wu
- Department of Radiology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin’s Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, People’s Republic of China
| | - Yanyan Zhang
- Department of Radiology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin’s Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, People’s Republic of China
- Department of Radiology, Second Hospital of Tianjin Medical University, Tianjin300211, People’s Republic of China
| | - Na Zhuo
- Department of Ultrasound, Second Hospital of Tianjin Medical University, Tianjin300211, People’s Republic of China
| | - Mingjie Wu
- Institut National De La Recherche Scientifique-Energie Materiaux Et Telecommunications, Varennes,QuebecJ3X 1S2, Canada
| | - Zhaoxiang Ye
- Department of Radiology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin’s Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin 300060, People’s Republic of China
| | - Xuening Zhang
- Department of Radiology, Second Hospital of Tianjin Medical University, Tianjin300211, People’s Republic of China
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13
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Liu L, Luo D, Yao G, Huang X, Wei L, Liu Y, Wu Q, Mai X, Liu G, Xiao T. Comparative Activation Process of Pb, Cd and Tl Using Chelating Agents from Contaminated Red Soils. Int J Environ Res Public Health 2020; 17:ijerph17020497. [PMID: 31941097 PMCID: PMC7013510 DOI: 10.3390/ijerph17020497] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Revised: 01/07/2020] [Accepted: 01/08/2020] [Indexed: 11/16/2022]
Abstract
Adding chelating agents is a critical technique of heavy metal activation for enhancing phytoextraction through the formation of soluble metal complexes which will be more readily available for extraction. The preliminary, dynamic, equilibrium activation experiments and speciation analysis of Pb, Cd and Tl in contaminated red soils were used to select six chelates with relatively good activation performance from nine chelates, and the effects of dosage and pH on the heavy metals activation were studied systematically. Results showed that the activation of Pb, Cd and Tl by chelates reached equilibrium within 2 h, and the activation process showed three stages. Under neutral conditions, chelates had better activation performance on Pb- and Cd-contaminated soils. Except for S,S-ethylenediamine disuccinic acid (S,S-EDDS) and citric acid (CA), the maximum equilibrium activation effect (MEAE) of ethylenediaminetetraacetic acid (EDTA), N,N-bis (carboxymethyl) glutamic acid (GLDA), diethylenetriaminepentaacetic acid (DTPA) and aminotriacetic acid (NTA) was over 81%. The MEAE of Tl-contaminated soil was less than 15%. The decreasing order of the dosage of chelating agents corresponding to MEAE for three types of contaminated soils was Pb-, Cd- and Tl-contaminated soil, relating to the forms of heavy metals, the stability constants of metal–chelates and the activation of non-target elements Fe in red soil. Under acidic conditions, the activation efficiencies of chelates decreased to differing degrees in Pb- and Cd-contaminated soils, whereas the activation efficiencies of chelating agents in Tl-contaminated soils were slightly enhanced.
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Affiliation(s)
- Lirong Liu
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
| | - Dinggui Luo
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
- Linköping University—Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China;
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China
- Correspondence:
| | - Guangchao Yao
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
| | - Xuexia Huang
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
- Linköping University—Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China;
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China
| | - Lezhang Wei
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
- Linköping University—Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China;
| | - Yu Liu
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
- Linköping University—Guangzhou University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou 510006, China
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China;
| | - Qihang Wu
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China;
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou 510006, China
| | - Xiaotao Mai
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
| | - Guowei Liu
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
| | - Tangfu Xiao
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; (L.L.); (G.Y.); (X.H.); (L.W.); (Y.L.); (X.M.); (G.L.); (T.X.)
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Karimzadeh L, Lippold H, Stockmann M, Fischer C. Effect of DTPA on europium sorption onto quartz - Batch sorption experiments and surface complexation modeling. Chemosphere 2020; 239:124771. [PMID: 31520970 DOI: 10.1016/j.chemosphere.2019.124771] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 04/11/2019] [Revised: 08/22/2019] [Accepted: 09/04/2019] [Indexed: 06/10/2023]
Abstract
Sorption of radionuclides on mineral surfaces retards their migration in the environment of a repository. Presence of organic ligands, however, affects sorption and consequently influences their transport behavior. In this study, we quantify the sorption of Eu(III) onto quartz surfaces as a function of pH in the absence and presence of diethylenetriaminepentaacetic acid (DTPA). Batch sorption experiments show a pH-dependent sorption of Eu(III) on quartz. The presence of DTPA results in slightly higher sorption of Eu(III) at neutral to slightly acidic pH and considerably lower sorption at alkaline conditions. Sorption experiments were simulated using the Diffuse Double Layer Model (DDLM) with single sorption sites (≡QOH) and monodentate surface complexation. The reactions were established based on the aqueous speciation calculation under the experimental conditions, and the thermodynamic constants of surface reactions were obtained and refined by numerical optimization. Results of surface complexation modeling show the formation of a surface species ≡QOHEuDTPA2-, explaining the elevated sorption of Eu(III) at neutral to slightly acidic pH. In contrast, dissolved EuDTPA2- complex species are present at alkaline pH, resulting in an enhanced mobility of Eu(III).
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Affiliation(s)
- Lotfollah Karimzadeh
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Reactive Transport Department, Permoserstr. 15, 04318, Leipzig, Germany.
| | - Holger Lippold
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Reactive Transport Department, Permoserstr. 15, 04318, Leipzig, Germany
| | - Madlen Stockmann
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Reactive Transport Department, Permoserstr. 15, 04318, Leipzig, Germany
| | - Cornelius Fischer
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Reactive Transport Department, Permoserstr. 15, 04318, Leipzig, Germany
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Gabarrón M, Faz A, Martínez-Martínez S, Acosta JA. Concentration and chemical distribution of metals and arsenic under different typical Mediterranean cropping systems. Environ Geochem Health 2019; 41:2845-2857. [PMID: 31197552 DOI: 10.1007/s10653-019-00349-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 12/11/2018] [Accepted: 06/05/2019] [Indexed: 06/09/2023]
Abstract
Soil under an intensive agriculture production could result in metal pollution if bad management practices are carried out. The aims of this study were to evaluate the influence of cropping systems on soil metal(loid)s accumulation and speciation and to identify metal sources for each cropping system. To achieve these objectives, 40 soil samples from cereal, fruit, citrus and horticultural cropping areas and 15 samples from non-disturbed areas were collected. pH, salinity, particle size distribution, organic carbon and carbonate contents were analysed. In addition, total, DTPA-extractable and water-soluble Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn and As concentrations and their chemical speciation were determined. Results showed an enrichment of Pb in cereal and horticultural soils, of Zn in fruit and horticultural soils and of Cu and Cd in citrus soils. The most available metals were Pb and Cd which was due to their ability to bind to carbonate and reducible phases of soils. The PCA suggested an anthropogenic origin of Pb, Cd, Cu and Zn in most of the cropping systems; this origin was related to both agriculture management practices and other anthropic actions, such as traffic. Therefore, changes in crop managements are necessary for a sustainable agriculture in the studied crop systems.
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Affiliation(s)
- María Gabarrón
- Sustainable Use, Management and Reclamation of Soil and Water Research Group, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203, Cartagena, Spain.
| | - Angel Faz
- Sustainable Use, Management and Reclamation of Soil and Water Research Group, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203, Cartagena, Spain
| | - Silvia Martínez-Martínez
- Sustainable Use, Management and Reclamation of Soil and Water Research Group, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203, Cartagena, Spain
| | - Jose A Acosta
- Sustainable Use, Management and Reclamation of Soil and Water Research Group, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 48, 30203, Cartagena, Spain
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Huang M, Zhang Y, Xiang W, Zhou T, Wu X, Mao J. Efficient adsorption of Mn(II) by layered double hydroxides intercalated with diethylenetriaminepentaacetic acid and the mechanistic study. J Environ Sci (China) 2019; 85:56-65. [PMID: 31471031 DOI: 10.1016/j.jes.2019.04.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 04/11/2019] [Accepted: 04/11/2019] [Indexed: 06/10/2023]
Abstract
In this study, greatly enhanced Mn(II) adsorption was achieved by as-synthesized diethylenetriaminepentaacetate acid intercalated Mg/Al layered double hydroxides (LDHs-DTPA). The adsorption capacity of LDHs-DTPA was 83.5 mg/g, which is much higher than that of LDHs-EDTA (44.4 mg/g), LDHs-Oxalate (21.6 mg/g) and LDHs (28.8 mg/g). The adsorption data of aqueous Mn(II) using LDHs-DTPA could be well described by the pseudo-second order kinetics and Langmuir isotherm model. Thermodynamics study results also showed that the adsorption process of Mn(II) by LDHs-DTPA was exothermic as indicated by the negative ΔH value. Furthermore, based on the structural, morphological and thermostable features, as well as FT-IR and XPS characterizations of LDHs-DTPA and the pristine LDHs, the adsorption mechanism of Mn(II) was proposed. The carboxyl groups of DTPA were proposed to be the main binding sites for Mn(II), and the hydroxyl groups of LDHs also played a minor role in the adsorption process. Among the three common regeneration reagents, 0.1 mol/L Na2CO3 was the best for reusing LDHs-DTPA in Mn(II) adsorption. Besides, the Mn(II) adsorption performance could be hindered in the presence of typical inorganic ions, especially cations. Further specific modifications of LDHs-DTPA are suggested to get more selective adsorption of Mn(II) in practical applications.
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Affiliation(s)
- Mingjie Huang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yingxin Zhang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China
| | - Wei Xiang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China
| | - Tao Zhou
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Xiaohui Wu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China.
| | - Juan Mao
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China
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17
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Del Solar V, Contel M. Metal-based antibody drug conjugates. Potential and challenges in their application as targeted therapies in cancer. J Inorg Biochem 2019; 199:110780. [PMID: 31434020 PMCID: PMC6745269 DOI: 10.1016/j.jinorgbio.2019.110780] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 07/08/2019] [Accepted: 07/14/2019] [Indexed: 12/22/2022]
Abstract
Antibody drug conjugates have emerged as a very attractive type of targeted therapy in cancer. They combine the antigen-targeting specificity of monoclonal antibodies (mAbs) with the cytotoxic potency of chemotherapeutics. This review focuses on antibody drug conjugates based on metal-containing cytotoxic payloads. We will also describe antibody drug conjugates (ADCs) in which a metal-based component (mostly metallic nanoparticles) exerts a relevant function in the ADC (for photodynamic or photothermal therapy, as air-plasma-enhancer or chemo-sensitizer, as carrier of other cytotoxic payloads or as an integral part of the linker structure). Challenges and opportunities to increase the translational potential of these ADCs will be discussed.
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Affiliation(s)
- Virginia Del Solar
- Department of Chemistry, Brooklyn College, The City University of New York, Brooklyn, NY 11210, USA
| | - María Contel
- Department of Chemistry, Brooklyn College, The City University of New York, Brooklyn, NY 11210, USA; Biology PhD Program, The Graduate Center, The City University of New York, 365 Fifth Avenue, New York, NY 10016, USA; Biochemistry PhD Program, The Graduate Center, The City University of New York, 365 Fifth Avenue, New York, NY 10016, USA; Chemistry PhD Program, The Graduate Center, The City University of New York, 365 Fifth Avenue, New York, NY 10016, USA; Cancer Biology Program, University of Hawaii Cancer Center, University of Hawaii at Manoa, Honolulu, USA.
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Luo P, Xiao X, Han X, Ma Y, Sun X, Jiang J, Wang H. Application of different single extraction procedures for assessing the bioavailability of heavy metal(loid)s in soils from overlapped areas of farmland and coal resources. Environ Sci Pollut Res Int 2019; 26:14932-14942. [PMID: 30919188 DOI: 10.1007/s11356-019-04833-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 11/07/2018] [Accepted: 03/08/2019] [Indexed: 06/09/2023]
Abstract
Heavy metal(loid) extraction from soils in overlapped areas of farmland and coal resources (OAFCR) is crucial in understanding heavy metal bioavailability in soil and the subsequent risks to crops and consumers. However, limited attention has been paid to the extraction procedure of heavy metal(loid)s in OAFCR soils in the research. This study therefore explored different single and mixed extraction procedures, such as acetic acid (HOAc), citric acid, ammonium bicarbonate-diethylenetriaminepentaacetic acid (AB-DTPA), ethylene diamine tetraacetic acid + ammonium acetate (EDTA+NH4OAc), and total digestion (HNO3-HClO4-HF) to determine the bioavailability of As, Cd, Cr, Cu, Pb, and Zn in OAFCR soil in Xuzhou, China. The results showed the metal(loid) extraction capacity from soil of the different procedures could be ranked as AB-DTPA > EDTA+NH4OAc > HOAC > citric acid. The transfer ability of heavy metal(loid)s from soil to wheat tissues and from wheat roots to aerial parts was analyzed by calculating the bioconcentration factor and transfer factor, respectively. Transfer factors of all metal(loid)s were < 1 except Cr whose transfer factor from root to shell and straw were > 1. It is suspected that foliar uptake plays a dominant role in Cr uptake. Correlation analysis between the bioavailability of heavy metal(loid)s in soil and uptake in respective wheat tissues was performed to recommend the best extraction procedures for different studies. The results show that AB-DTPA extraction is recommended for Cu uptake to wheat roots, straws, shells and grains, Zn uptake to roots, and Cd uptake to roots and straws.
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Affiliation(s)
- Ping Luo
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou, 221116, Jiangsu, China
| | - Xin Xiao
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou, 221116, Jiangsu, China.
| | - Xiaoxuan Han
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou, 221116, Jiangsu, China
| | - Yu Ma
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou, 221116, Jiangsu, China
| | - Xiaofei Sun
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou, 221116, Jiangsu, China
| | - Jiachao Jiang
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou, 221116, Jiangsu, China
| | - Hui Wang
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, 1 Daxue Road, Xuzhou, 221116, Jiangsu, China
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Bishop SC, Winefield R, Anbanandam A, Lampe JN. Aqueous synthesis of a small-molecule lanthanide chelator amenable to copper-free click chemistry. PLoS One 2019; 14:e0209726. [PMID: 30917122 PMCID: PMC6436693 DOI: 10.1371/journal.pone.0209726] [Citation(s) in RCA: 2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 02/17/2019] [Indexed: 11/24/2022] Open
Abstract
The lanthanides (Ln3+), or rare earth elements, have proven to be useful tools for biomolecular NMR, X-ray crystallographic, and fluorescence analyses due to their unique 4f orbitals. However, their utility in biological applications has been limited because site-specific incorporation of a chelating element is required to ensure efficient binding of the free Ln3+ ion. Additionally, current Ln3+ chelator syntheses complicate efforts to directly incorporate Ln3+ chelators into proteins as the multi-step processes and a reliance on organic solvents promote protein denaturation and aggregation which are generally incompatible with direct incorporation into the protein of interest. To overcome these limitations, herein we describe a two-step aqueous synthesis of a small molecule lanthanide chelating agent amenable to site-specific incorporation into a protein using copper-free click chemistry with unnatural amino acids. The bioconjugate combines a diethylenetriaminepentaacetic acid (DTPA) chelating moiety with a clickable dibenzylcyclooctyne-amine (DBCO-amine) to facilitate the reaction with an azide containing unnatural amino acid. Incorporating the DBCO-amine avoids the use of the cytotoxic Cu2+ ion as a catalyst. The clickable lanthanide chelator (CLC) reagent reacted readily with p-azidophenylalanine (paF) without the need of a copper catalyst, thereby demonstrating proof-of-concept. Implementation of the orthogonal click chemistry reaction has the added advantage that the chelator can be used directly in a protein labeling reaction, without the need of extensive purification. Given the inherent advantages of Cu2+-free click chemistry, aqueous synthesis, and facile labeling, we believe that the CLC will find abundant use in both structural and biophysical studies of proteins and their complexes.
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Affiliation(s)
- Stephanie C. Bishop
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS, United States of America
| | - Robert Winefield
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS, United States of America
| | - Asokan Anbanandam
- High Field NMR Core Facility, Center for Drug Discovery and Innovation, University of South Florida, Tampa, FL, United States of America
| | - Jed N. Lampe
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS, United States of America
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Mortezazadeh T, Gholibegloo E, Alam NR, Dehghani S, Haghgoo S, Ghanaati H, Khoobi M. Gadolinium (III) oxide nanoparticles coated with folic acid-functionalized poly(β-cyclodextrin-co-pentetic acid) as a biocompatible targeted nano-contrast agent for cancer diagnostic: in vitro and in vivo studies. MAGMA 2019; 32:487-500. [PMID: 30730021 DOI: 10.1007/s10334-019-00738-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [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: 09/24/2018] [Revised: 12/22/2018] [Accepted: 01/14/2019] [Indexed: 12/15/2022]
Abstract
OBJECTIVES In this study, a novel targeted MRI contrast agent was developed by coating gadolinium oxide nanoparticles (Gd2O3 NPs) with β-cyclodextrin (CD)-based polyester and targeted by folic acid (FA). MATERIALS AND METHODS The developed Gd2O3@PCD-FA MRI contrast agent was characterized and evaluated in relaxivity, in vitro cell targeting, cell toxicity, blood compatibility and in vivo tumor MR contrast enhancement. RESULTS In vitro cytotoxicity and hemolysis assays revealed that Gd2O3@PCD-FA NPs have no significant cytotoxicity after 24 and 48 h against normal human breast cell line (MCF-10A) at concentration of up to 50 µg Gd+3/mL and have high blood compatibility at concentration of up to 500 µg Gd+3/mL. In vitro MR imaging experiments showed that Gd2O3@PCD-FA NPs enable targeted contrast T1- and T2-weighted MR imaging of M109 as overexpressing folate receptor cells. Besides, the in vivo analysis indicated that the maximum contrast-to-noise ratio (CNR) of tumor in mice increased after injection of Gd2O3@PCD-FA up to 5.89 ± 1.3 within 1 h under T1-weighted imaging mode and reduced to 1.45 ± 0.44 after 12 h. While CNR increased up to maximum value of 1.98 ± 0.28 after injection of Gd2O3@PCD within 6 h and reduced to 1.12 ± 0.13 within 12 h. CONCLUSION The results indicate the potential of Gd2O3@PCD-FA to serve as a novel targeted nano-contrast agent in MRI.
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Affiliation(s)
- Tohid Mortezazadeh
- Department of Medical Physic, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elham Gholibegloo
- Biomaterials Group, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, 1417614411, Tehran, Iran
| | - Nader Riyahi Alam
- Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran.
- Department of Pharmaceutical Biomaterials, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran.
| | - Sadegh Dehghani
- Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran
| | - Soheila Haghgoo
- Pharmaceutical Department, Food and Drug Laboratory Research Center, Food and Drug Organization (FDO), Ministry of Health, Imam St., Valiasr Cross, Tehran, 1113615911, Iran
| | - Hossein Ghanaati
- Pharmaceutical Department, Food and Drug Laboratory Research Center, Food and Drug Organization (FDO), Ministry of Health, Imam St., Valiasr Cross, Tehran, 1113615911, Iran
- Medical Imaging Center, Imam Hospital Complex, School of Medicine, Tehran University of Medical Sciences (TUMS), Keshavarz Blvd, Tehran, 1419733141, Iran
| | - Mehdi Khoobi
- Biomaterials Group, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, 1417614411, Tehran, Iran.
- Department of Pharmaceutical Biomaterials, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran.
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Yang F, Yu Z, Li X, Ren P, Liu G, Song Y, Wang J. Design and synthesis of a novel lanthanide fluorescent probe (Tb III-dtpa-bis(2,6-diaminopurine)) and its application to the detection of uric acid in urine sample. Spectrochim Acta A Mol Biomol Spectrosc 2018; 203:461-471. [PMID: 29894961 DOI: 10.1016/j.saa.2018.06.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 03/07/2018] [Revised: 05/21/2018] [Accepted: 06/02/2018] [Indexed: 06/08/2023]
Abstract
In this study, a novel fluorescent probe, TbIII-dtpa-bis(2,6-diaminopurine) (Tb-dtpa-bdap), is designed based on the principle of complementary base pairing and synthesized for uric acid detection. The synthesized fluorescent probe is characterized by 1H NMR, 13C NMR, infra-red (IR) spectrum and ultraviolet-visible (UV-vis) spectra. It is found that the fluorescence of Tb-dtpa-bdap solution can be quenched obviously in the presence of uric acid. The affecting factors, including solution acidity, uric acid concentration and interfering substances, on the detection of uric acid using this probe are examined. Under optimized conditions, the fluorescence intensities of Tb-dtpa-bdap solution towards different uric acid concentrations show a linear response in the range from 1.00 × 10-5 mol·L-1 to 5.00 × 10-5 mol·L-1 with a linear correlation coefficient (R2) of 0.9877. And the obtained limit of detection (LOD) is about 5.80 × 10-6 mol·L-1, which is lower than the level of uric acid in actual urine. The mechanism on the detection of uric acid by using Tb-dtpa-bdap is inferred from the experimental results. The facts demonstrate that the proposed fluorescent probe can be successfully applied for the determination of uric acid in human urine samples.
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Affiliation(s)
- Fan Yang
- College of Chemistry, Liaoning University, Shenyang 110036, PR China
| | - Zhiyue Yu
- College of Chemistry, Liaoning University, Shenyang 110036, PR China
| | - Xinyi Li
- College of Environment, Liaoning University, Shenyang 110036, PR China
| | - Peipei Ren
- College of Environment, Liaoning University, Shenyang 110036, PR China
| | - Guanhong Liu
- College of Environment, Liaoning University, Shenyang 110036, PR China
| | - Youtao Song
- College of Environment, Liaoning University, Shenyang 110036, PR China.
| | - Jun Wang
- College of Chemistry, Liaoning University, Shenyang 110036, PR China; College of Environment, Liaoning University, Shenyang 110036, PR China.
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Hughes DL, Afsar A, Laventine DM, Shaw EJ, Harwood LM, Hodson ME. Metal removal from soil leachates using DTPA-functionalised maghemite nanoparticles, a potential soil washing technology. Chemosphere 2018; 209:480-488. [PMID: 29940531 DOI: 10.1016/j.chemosphere.2018.06.121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 11/28/2017] [Revised: 06/14/2018] [Accepted: 06/18/2018] [Indexed: 06/08/2023]
Abstract
There is significant current interest in the application of magnetic (magnetite or maghemite) nanoparticles functionalised with chelating agents for the environmental remediation of metal contaminated waters and solutions. Whilst there is a body of knowledge about the potential remediation efficacy of such engineered nanoparticles from studies involving synthetic solutions of single metals, there is relatively little data involving mixed-metal solutions and virtually no studies about nanoparticle performance in chemically complex environmental solutions representing those to which a scaled-up nanoremediation process might eventually be applied. Therefore, we investigated the ability of diethylenetriaminepentaacetic acid (DTPA)-functionalised, silica-coated maghemite nanoparticles to extract potentially toxic (Cd, Co, Cu) and "non-toxic" (Ca, Mg) metals from solution (initial [metal] = 10 mg L-1; pH range: 2-8) and to extract a wider range of elements (As, Ca, Cd, Co, Cr, Cu, Mg, Na, Pb, Zn) from leachate obtained from 10 different contaminated soils with variable initial pH, (semi-)metal and dissolved organic carbon (DOC) concentrations. The functionalised nanoparticles could extract the potentially toxic metals with high efficiency (in general >70%) from single metal solutions and with efficiencies that were either unaffected or reduced from the soil leachates. Kd values remained high (>500 L kg-1), even for the soil leachate extractions. Our findings show that DOC and relatively high concentrations of non-toxic elements do not necessarily reduce the efficiency of metal contaminant removal by DTPA-functionalised magnetic nanoparticles and thus demonstrate the remediation potential of such particles when added to chemically complex soil-derived contaminated solutions.
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Affiliation(s)
- D L Hughes
- Soil Research Centre, Department of Geography and Environmental Science, School of Archaeology, Geography and Environmental Science, University of Reading, Whiteknights, Reading, RG6 6DW, UK
| | - A Afsar
- Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, UK
| | - D M Laventine
- Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, UK
| | - E J Shaw
- Soil Research Centre, Department of Geography and Environmental Science, School of Archaeology, Geography and Environmental Science, University of Reading, Whiteknights, Reading, RG6 6DW, UK
| | - L M Harwood
- Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, UK
| | - M E Hodson
- Soil Research Centre, Department of Geography and Environmental Science, School of Archaeology, Geography and Environmental Science, University of Reading, Whiteknights, Reading, RG6 6DW, UK; Environment Department, University of York, York, YO10 5NG, UK.
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23
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Haubner R, Schmid AM, Maurer A, Rangger C, Roig LG, Pichler BJ, Virgolini IJ. [ 68Ga]NOTA-Galactosyl Human Serum Albumin: a Tracer for Liver Function Imaging with Improved Stability. Mol Imaging Biol 2018; 19:723-730. [PMID: 28194629 PMCID: PMC5574957 DOI: 10.1007/s11307-017-1046-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Purpose Non-invasive techniques allowing quantitative determination of the functional liver mass are of great interest for patient management in a variety of clinical settings. Recently, we presented [68Ga]DTPA-GSA to target the hepatic asialoglycoprotein receptor for this purpose. Here, we introduce [68Ga]NOTA-GSA to improve metabolic stability of the radiopharmaceutical and compare the imaging properties with [68Ga]DTPA-GSA. Procedures Labeling of the compounds was carried out at room temperature using 1.9 M sodium acetate as buffer. For quality control, thin-layer, high-performance liquid, and size exclusion chromatographies were used. Metabolic stability was studied in rat and human serums. For in vivo evaluation, Fischer rats were scanned by positron emission tomography and magnetic resonance imaging and subsequently sacrificed for biodistribution studies. Time activity curves (TACs) for heart and liver were generated and corresponding parameters (T50, T90, LHL15, HH15) were calculated. Results [68Ga]NOTA-GSA can be produced in high radiochemical yield and purity (>95 %) within 15 min. Stability studies revealed almost no metabolite formation over the 2-h observation period. Analysis of the TACs showed comparable results for most of the investigated parameters. The only significant difference was found in the T90 value, where [68Ga]NOTA-GSA showed slower uptake in comparison with 68Ga-DTPA-GSA (123 ± 10 vs. 89 ± 3 s, p < 0.01). Conclusions [68Ga]NOTA-GSA showed a significant increase of the metabolic stability and in most organs lower background activity. However, comparison of LHL15 and HH15 indicates that the increased stability did not further improve the diagnostic value. Thus, [68Ga]NOTA-GSA and [68Ga]DTPA-GSA can be used equivalent for imaging hepatic function with positron emission tomography.
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Affiliation(s)
- Roland Haubner
- Department of Nuclear Medicine, Medical University of Innsbruck, Anichstr. 35, 6020, Innsbruck, Austria.
| | - Andreas M Schmid
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Röntgenweg 13, 72076, Tübingen, Germany
| | - Andreas Maurer
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Röntgenweg 13, 72076, Tübingen, Germany
| | - Christine Rangger
- Department of Nuclear Medicine, Medical University of Innsbruck, Anichstr. 35, 6020, Innsbruck, Austria
| | - Llanos Geraldo Roig
- Department of Nuclear Medicine, Medical University of Innsbruck, Anichstr. 35, 6020, Innsbruck, Austria
| | - Bernd J Pichler
- Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Röntgenweg 13, 72076, Tübingen, Germany
| | - Irene J Virgolini
- Department of Nuclear Medicine, Medical University of Innsbruck, Anichstr. 35, 6020, Innsbruck, Austria
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24
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Torres JB, Knight JC, Mosley MJ, Kersemans V, Koustoulidou S, Allen D, Kinchesh P, Smart S, Cornelissen B. Imaging of Claudin-4 in Pancreatic Ductal Adenocarcinoma Using a Radiolabelled Anti-Claudin-4 Monoclonal Antibody. Mol Imaging Biol 2018; 20:292-299. [PMID: 28842811 PMCID: PMC5862916 DOI: 10.1007/s11307-017-1112-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
PURPOSE Despite its widespread use, the positron emission tomography (PET) radiotracer 2-deoxy-2-[18F]fluoro-D-glucose ([18F]FDG) has been shown in clinical settings to be ineffective for improving early diagnosis of pancreatic ductal adenocarcinoma (PDAC). A promising biomarker for PDAC detection is the tight junction protein claudin-4. The purpose of this study was to evaluate a new single-photon emission computed tomography (SPECT) imaging agent, [111In]anti-claudin-4 mAb, with regard to its ability to allow visualisation of claudin-4 in a xenograft and a genetically engineered mouse model of PDAC. PROCEDURES The ability of [111In]anti-claudin-4 mAb to selectively target claudin-4 was assessed using two human xenograft tumour models with differential claudin-4 status in mice. [111In]anti-claudin-4 mAb was also used to detect PDAC development in genetically engineered KPC mice. The PDAC status of these mice was confirmed with [18F]FDG-PET, magnetic resonance imaging (MRI), histology, and immunofluorescence microscopy. RESULTS High uptake of [111In]anti-claudin-4 mAb was observed in PDAC xenografts in mice, reaching 16.9 ± 4.5 % of injected dose per gram (% ID/g) at 72 h post-injection. This uptake was mediated specifically by the expression of claudin-4. Uptake of [111In]anti-claudin-4 mAb also enabled clear visualisation of spontaneous PDAC formation in KPC mice. CONCLUSIONS [111In]anti-claudin-4 mAb allows non-invasive detection of claudin-4 upregulation during development of PDAC and could potentially be used to aid in the early detection and characterisation of this malignancy.
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Affiliation(s)
- Julia Baguña Torres
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - James C Knight
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Michael J Mosley
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Veerle Kersemans
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Sofia Koustoulidou
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Danny Allen
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Paul Kinchesh
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Sean Smart
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Bart Cornelissen
- CR-UK/MRC Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK.
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Chen JL, Zhao Y, Gong YJ, Pan BB, Wang X, Su XC. Stable and rigid DTPA-like paramagnetic tags suitable for in vitro and in situ protein NMR analysis. J Biomol NMR 2018; 70:77-92. [PMID: 29224182 DOI: 10.1007/s10858-017-0160-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 12/05/2017] [Indexed: 06/07/2023]
Abstract
Organic synthesis of a ligand with high binding affinities for paramagnetic lanthanide ions is an effective way of generating paramagnetic effects on proteins. These paramagnetic effects manifested in high-resolution NMR spectroscopy are valuable dynamic and structural restraints of proteins and protein-ligand complexes. A paramagnetic tag generally contains a metal chelating moiety and a reactive group for protein modification. Herein we report two new DTPA-like tags, 4PS-PyDTTA and 4PS-6M-PyDTTA that can be site-specifically attached to a protein with a stable thioether bond. Both protein-tag adducts form stable lanthanide complexes, of which the binding affinities and paramagnetic tensors are tunable with respect to the 6-methyl group in pyridine. Paramagnetic relaxation enhancement (PRE) effects of Gd(III) complex on protein-tag adducts were evaluated in comparison with pseudocontact shift (PCS), and the results indicated that both 4PS-PyDTTA and 4PS-6M-PyDTTA tags are rigid and present high-quality PREs that are crucially important in elucidation of the dynamics and interactions of proteins and protein-ligand complexes. We also show that these two tags are suitable for in-situ protein NMR analysis.
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Affiliation(s)
- Jia-Liang Chen
- State Key Laboratory of Elemento-Organic Chemistry and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Yu Zhao
- State Key Laboratory of Elemento-Organic Chemistry and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Yan-Jun Gong
- State Key Laboratory of Elemento-Organic Chemistry and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Bin-Bin Pan
- State Key Laboratory of Elemento-Organic Chemistry and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Xiao Wang
- State Key Laboratory of Elemento-Organic Chemistry and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Xun-Cheng Su
- State Key Laboratory of Elemento-Organic Chemistry and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China.
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Massas I, Gasparatos D, Ioannou D, Kalivas D. Signs for secondary buildup of heavy metals in soils at the periphery of Athens International Airport, Greece. Environ Sci Pollut Res Int 2018; 25:658-671. [PMID: 29052808 DOI: 10.1007/s11356-017-0455-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 07/11/2017] [Accepted: 10/09/2017] [Indexed: 06/07/2023]
Abstract
Emissions from civil airports are similar to those observed in industrial and urban areas. While air pollution and noise levels are regularly monitored and assessed, information on the status of heavy metals in soils close to airport facilities is limited. In this study, we monitored and assessed heavy metal distribution in soils close to Athens International Airport (AIA) in Attica, Greece. Following a grid sampling scenario, topsoil samples were collected from 86 sites at the periphery of AIA and total and available forms of Cu, Zn, Fe, Mn, Ni, Cr, Pb, and Ba concentrations were determined in aqua regia and DTPA soil extracts, respectively. Median concentration values for both metal forms are not considered as particularly high. However, 90th percentile concentration values for some metals are high, indicating soil enrichment. Evaluation of enrichment factor (EF) and availability ratio (AR) values and EFs spatial distribution have led to consistent conclusions of secondary and ongoing metal accumulation in the soils of the studied area. Tessier sequential extraction procedure was applied to 10% of the soil samples and the results showed high potential availability of Pb, Mn, Cu, and Ni, further supporting the continuous metal accumulation in the studied soils.
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Affiliation(s)
- Ioannis Massas
- Laboratory of Soil Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece.
| | - Dionisios Gasparatos
- Laboratory of Soil Science, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
| | - Dafni Ioannou
- Laboratory of Soil Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Dionisios Kalivas
- Laboratory of Soil Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
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27
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Shaheen SM, Antoniadis V, Kwon EE, Biswas JK, Wang H, Ok YS, Rinklebe J. Biosolids application affects the competitive sorption and lability of cadmium, copper, nickel, lead, and zinc in fluvial and calcareous soils. Environ Geochem Health 2017; 39:1365-1379. [PMID: 28258314 DOI: 10.1007/s10653-017-9927-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 12/23/2016] [Accepted: 02/23/2017] [Indexed: 06/06/2023]
Abstract
The objective of this research was to investigate the effects of biosolids on the competitive sorption and lability of the sorbed Cd, Cu, Ni, Pb, and Zn in fluvial and calcareous soils. Competitive sorption isotherms were developed, and the lability of these metals was estimated by DTPA extraction following their sorption. Sorption of all metals was higher in the fluvial than in the calcareous soil. Sorption of Cu and Pb was stronger than that of Cd, Ni, and Zn in all soils. Biosolids application (2.5%) reduced the sorption of all metals especially Cu and Pb (28-43%) in both soils (especially the calcareous soil) at the lower added metal concentrations (50 and 100 mg L-1). However, it increased the sorption of all metals especially Pb and Cu in both soils (especially the calcareous soil; 15.5-fold for Cu) at the higher added concentrations (250 and 300 mg L-1). Nickel showed the highest lability followed by Cd, Zn, and Pb in both soils. Biosolids increased the lability of the sorbed Ni in the fluvial soils at all added concentrations and the lability of Cd, Pb, and Zn at 50 mg L-1, but decreased the lability of Cd, Pb, and Zn at 250 and 300 mg L-1 in both soils. We conclude that at low loading rate (e.g., 50 mg L-1) biosolids treatment might increase the lability and environmental risk of Cd, Cu, Pb, and Zn. However, at high loading rate (e.g., 300 mg L-1) biosolids may be used as an immobilizing agent for Cd, Cu, Pb, Zn and mobilizing agent for Ni.
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Affiliation(s)
- Sabry M Shaheen
- Department of Soil and Water Sciences, Faculty of Agriculture, University of Kafrelsheikh, 33 516, Kafr El-Sheikh, Egypt.
- School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Soil- and Groundwater-Management, University of Wuppertal, Pauluskirchstraße 7, 42285, Wuppertal, Germany.
| | - Vasileios Antoniadis
- School of Agriculture, University of Thessaly, Fytokou Street, 384 46, Volos, Greece
| | - Eilhann E Kwon
- Department of Environment and Energy, Sejong University, Seoul, 05006, Korea
| | - Jayanta K Biswas
- Department of Ecological Engineering and Environmental Management, University of Kalyani, Nadia, West Bengal, 741235, India
| | - Hailong Wang
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an, Hangzhou, 311300, Zhejiang Province, China
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, Guangdong, China
| | - Yong Sik Ok
- School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Soil- and Groundwater-Management, University of Wuppertal, Pauluskirchstraße 7, 42285, Wuppertal, Germany
- School of Natural Resources and Environmental Science and Korea Biochar Research Center, Kangwon National University, Chuncheon, 24341, Korea
| | - Jörg Rinklebe
- School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Soil- and Groundwater-Management, University of Wuppertal, Pauluskirchstraße 7, 42285, Wuppertal, Germany
- Department of Environment and Energy, Sejong University, Seoul, 05006, Korea
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Hseu ZY, Lai YJ. Nickel accumulation in paddy rice on serpentine soils containing high geogenic nickel contents in Taiwan. Environ Geochem Health 2017; 39:1325-1334. [PMID: 28229256 DOI: 10.1007/s10653-017-9925-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [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: 12/16/2016] [Accepted: 02/17/2017] [Indexed: 06/06/2023]
Abstract
We investigated the extractability of nickel (Ni) in serpentine soils collected from rice paddy fields in eastern Taiwan to evaluate the bioavailability of Ni in the soils as well as for demonstrating the health risks of Ni in rice. Total Ni concentrations in the soils ranged were 70.2-2730 mg/kg (mean, 472 mg/kg), greatly exceeding the natural background content and soil control standard in Taiwan. Available Ni concentration only accounts for <10% of total soil Ni content; 0.1 N HCl-extractable Ni was the more suitable index for Ni bioavailability in the soil to rice than was diethylenetriaminepentaacetic acid (DTPA)-extractable Ni. The accumulation ability of rice roots was much higher than that of its shoots; however, compared with those reported previously, our brown and polished rice samples contained much higher Ni concentrations, within the ranges of 1.50-4.53 and 2.45-5.54 mg/kg, respectively. On the basis of the provisional tolerable Ni intake for adults recommended by the World Health Organization (WHO), daily consumption of this rice can result in an excessive Ni intake.
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Affiliation(s)
- Zeng-Yei Hseu
- Department of Agricultural Chemistry, National Taiwan University, Taipei, 10617, Taiwan.
| | - Yun-Jie Lai
- Apollo Technology Co. LTD, Taipei, 10595, Taiwan
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Hughes DL, Afsar A, Harwood LM, Jiang T, Laventine DM, Shaw LJ, Hodson ME. Adsorption of Pb and Zn from binary metal solutions and in the presence of dissolved organic carbon by DTPA-functionalised, silica-coated magnetic nanoparticles. Chemosphere 2017; 183:519-527. [PMID: 28570895 DOI: 10.1016/j.chemosphere.2017.05.146] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 05/17/2017] [Accepted: 05/24/2017] [Indexed: 05/28/2023]
Abstract
The ability of diethylenetriaminepentaacetic acid (DTPA)-functionalised, silica-coated magnetic nanoparticles to adsorb Pb and Zn from single and bi-metallic metal solutions and from solutions containing dissolved organic carbon was assessed. In all experiments 10 mL solutions containing 10 mg of nanoparticles were used. For single metal solutions (10 mg L-1 Pb or Zn) at pH 2 to 8, extraction efficiencies were typically >70%. In bi-metallic experiments, examining the effect of a background of either Zn or Pb (0.025 mmol L-1) on the adsorption of variable concentrations (0-0.045 mmol L-1) of the other metal (Pb or Zn, respectively) adsorption was well modelled by linear isotherms (R2 > 0.60; p ≤ 0.001) and Pb was preferentially adsorbed relative to Zn. In dissolved organic carbon experiments, the presence of fulvic acid (0, 2.1 and 21 mg DOC L-1) reduced Pb and Zn adsorption from 0.01, 0.1 and 1.0 mmol L-1 solutions. However, even at 21 mg DOC L-1 fulvic acid, extraction efficiencies from 0.01 to 0.1 mmol L-1 solutions remained >80% (Pb) and >50% (Zn). Decreases in extraction efficiency were significant between initial metal concentrations of 0.1 and 1.0 mmol L-1 indicating that at metal loadings between c. 100 mg kg-1 and 300 mg kg-1 occupancy of adsorption sites began to limit further adsorption. The nanoparticles have the potential to perform effectively as metal adsorbents in systems containing more than one metal and dissolved organic carbon at a range of pH values.
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Affiliation(s)
- D L Hughes
- Soil Research Centre, Department of Geography and Environmental Science, University of Reading, RG6 6DW, UK
| | - A Afsar
- Department of Chemistry, University of Reading, RG6 6AD, UK
| | - L M Harwood
- Department of Chemistry, University of Reading, RG6 6AD, UK
| | - T Jiang
- Soil Research Centre, Department of Geography and Environmental Science, University of Reading, RG6 6DW, UK
| | - D M Laventine
- Department of Chemistry, University of Reading, RG6 6AD, UK
| | - L J Shaw
- Soil Research Centre, Department of Geography and Environmental Science, University of Reading, RG6 6DW, UK
| | - M E Hodson
- Soil Research Centre, Department of Geography and Environmental Science, University of Reading, RG6 6DW, UK; Environment Department, University of York, York, YO10 5NG, UK.
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Lu K, Yang X, Gielen G, Bolan N, Ok YS, Niazi NK, Xu S, Yuan G, Chen X, Zhang X, Liu D, Song Z, Liu X, Wang H. Effect of bamboo and rice straw biochars on the mobility and redistribution of heavy metals (Cd, Cu, Pb and Zn) in contaminated soil. J Environ Manage 2017; 186:285-292. [PMID: 27264699 DOI: 10.1016/j.jenvman.2016.05.068] [Citation(s) in RCA: 247] [Impact Index Per Article: 35.3] [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: 02/04/2016] [Revised: 05/21/2016] [Accepted: 05/27/2016] [Indexed: 06/05/2023]
Abstract
Biochar has emerged as an efficient tool to affect bioavailability of heavy metals in contaminated soils. Although partially understood, a carefully designed incubation experiment was performed to examine the effect of biochar on mobility and redistribution of Cd, Cu, Pb and Zn in a sandy loam soil collected from the surroundings of a copper smelter. Bamboo and rice straw biochars with different mesh sizes (<0.25 mm and <1 mm), were applied at three rates (0, 1, and 5% w/w). Heavy metal concentrations in pore water were determined after extraction with 0.01 M CaCl2. Phytoavailable metals were extracted using DTPA/TEA (pH 7.3). The European Union Bureau of Reference (EUBCR) sequential extraction procedure was adopted to determine metal partitioning and redistribution of heavy metals. Results showed that CaCl2-and DTPA-extractable Cd, Cu, Pb and Zn concentrations were significantly (p < 0.05) lower in the bamboo and rice straw biochar treated soils, especially at 5% application rate, than those in the unamended soil. Soil pH values were significantly correlated with CaCl2-extractable metal concentrations (p < 0.01). The EUBCR sequential extraction procedure revealed that the acid extractable fractions of Cd, Cu, Pb and Zn decreased significantly (p < 0.05) with biochar addition. Rice straw biochar was more effective than bamboo biochar in decreasing the acid extractable metal fractions, and the effect was more pronounced with increasing biochar application rate. The effect of biochar particle size on extractable metal concentrations was not consistent. The 5% rice straw biochar treatment reduced the DTPA-extractable metal concentrations in the order of Cd < Cu < Pb < Zn, and reduced the acid extractable pool of Cd, Cu, Pb and Zn by 11, 17, 34 and 6%, respectively, compared to the control. In the same 5% rice straw biochar treatments, the organic bound fraction increased by 37, 58, 68 and 18% for Cd, Cu, Pb and Zn, respectively, compared to the control, indicating that the immobilized metals were mainly bound in the soil organic matter fraction. The results demonstrated that the rice straw biochar can effectively immobilize heavy metals, thereby reducing their mobility and bioavailability in contaminated soils.
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Affiliation(s)
- Kouping Lu
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China
| | - Xing Yang
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China
| | - Gerty Gielen
- Scion, Private Bag 3020, Rotorua 3046, New Zealand
| | - Nanthi Bolan
- Global Institute for Environmental Research, The University of Newcastle, University Drive, Callaghan, NSW 2308, Australia
| | - Yong Sik Ok
- Korea Biochar Research Center, Kangwon National University, Chuncheon 24341, South Korea
| | - Nabeel Khan Niazi
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
| | - Song Xu
- School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, China
| | - Guodong Yuan
- Guangdong Dazhong Agriculture Science Co. Ltd., Hongmei Town, Dongguan City, Guangdong 523169, China
| | - Xin Chen
- School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, China
| | - Xiaokai Zhang
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China
| | - Dan Liu
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China
| | - Zhaoliang Song
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China
| | - Xingyuan Liu
- Guangdong Dazhong Agriculture Science Co. Ltd., Hongmei Town, Dongguan City, Guangdong 523169, China
| | - Hailong Wang
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China; School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, China; Guangdong Dazhong Agriculture Science Co. Ltd., Hongmei Town, Dongguan City, Guangdong 523169, China.
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Chen Y, Cui J, Tian X, Zhao A, Li M, Wang S, Li X, Jia Z, Liu K. Effect of Straw Amendment on Soil Zn Availability and Ageing of Exogenous Water-Soluble Zn Applied to Calcareous Soil. PLoS One 2017; 12:e0169776. [PMID: 28081179 PMCID: PMC5230769 DOI: 10.1371/journal.pone.0169776] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 12/21/2016] [Indexed: 11/28/2022] Open
Abstract
Organic matter plays a key role in availability and transformation of soil Zn (zinc), which greatly controls Zn concentrations in cereal grains and human Zn nutrition level. Accordingly, soils homogenized with the wheat straw (0, 12 g straw kg-1) and Zn fertilizer (0, 7 mg Zn kg-1) were buried and incubated in the field over 210 days to explore the response of soil Zn availability and the ageing of exogenous Zn to straw addition. Results indicated that adding straw alone scarcely affected soil DTPA-Zn concentration and Zn fractions because of the low Zn concentration of wheat straw and the high soil pH, and large clay and calcium carbonate contents. However, adding exogenous Zn plus straw increased the DTPA-Zn abundance by about 5-fold and had the similar results to adding exogenous Zn alone, corresponding to the increased Zn fraction loosely bounded to organic matter, which had a more dominant presence in Zn reaction than soil other constituents such as carbonate and minerals in calcareous soil. The higher relative amount of ineffective Zn (~50%) after water soluble Zn addition also occurred, and at the days of 120–165 and 180–210when the natural temperature and rainfall changed mildly, the ageing process of exogenous Zn over time was well evaluated by the diffusion equation, respectively. Consequently, combining crop residues with exogenous water soluble Zn application is promising strategy to maximize the availability of Zn in calcareous soil, but the higher ageing rate of Zn caused by the higher Zn mobility should be considered.
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Affiliation(s)
- Yanlong Chen
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
| | - Juan Cui
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
| | - Xiaohong Tian
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
- * E-mail:
| | - Aiqing Zhao
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
| | - Meng Li
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
| | - Shaoxia Wang
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
| | - Xiushaung Li
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
| | - Zhou Jia
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
| | - Ke Liu
- College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China
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Karak T, Paul RK, Das DK, Boruah RK. Complexation of DTPA and EDTA with Cd 2+: stability constants and thermodynamic parameters at the soil-water interface. Environ Monit Assess 2016; 188:670. [PMID: 27848112 DOI: 10.1007/s10661-016-5685-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 05/13/2016] [Accepted: 11/07/2016] [Indexed: 06/06/2023]
Abstract
Two alkaline soils collected from the surface horizon (0-15 cm) of two agricultural fields Lakshmikantapur (LKP; 22° 06' 03″ N and 88° 18' 19″ E) and Diamond Harbour (DHB; 22° 11' N and 88° 14' E) of West Bengal, India were studied to observe the stability of cadmium (Cd) chelate complexes with diethylenetriaminepentaacetatic acid (DTPA) and ethylenediaminetetraacetic acid (EDTA), removing organic matter (OM). The objective of the present study is "determination of the stability constants and the thermodynamic parameters of Cd-DTPA and Cd-EDTA complexes at different pH and temperatures at the soil-water interface". Complex formation of soil Cd with DTPA and EDTA at the soil-water interface was studied under different ligand-to-metal ratios, pHs and temperatures. Apparent conditional stability constants (log k´) were calculated from the concentrations of Cd chelates and free Cd2+, estimated by solid phase extraction with an ion exchanger. Standard Gibbs energy (ΔG°), standard enthalpy (ΔH°) and standard entropy (ΔS°) of formation were calculated at three different temperatures. The higher stability constants of Cd-DTPA than Cd-EDTA indicated longer persistence of Cd-DTPA at the soil solution interface than Cd-EDTA complex. Increase of ΔG°, ΔH° and ΔS° with progress of temperature revealed that Cd-complex formation was facilitated by temperature. Highly negative ΔG° and positive ΔH° for Cd-complex formation indicated the reaction spontaneous and exothermic. In general, both ligands complexed high percentages of cadmium signalling their role in enhancing remobilization of Cd present in soil and preventing exchange of contaminated Cd from external source with soil mineral matrix; these phenomena may greatly reduce hazard for environment and human health. The result of this study support that DTPA increases solubility and more persistence of Cd in acidic soils within the range of temperature and mole fraction (MF = moles of Cd2+ / sum of the moles of Cd2+ and chelating agent) than that of EDTA due to higher capability of complex formation with Cd2+. Therefore, DTPA enhanced Cd toxicity in acid soils and groundwater. Complex formation in the presence of DTPA at acidic pH decreases with temperature and increases with pH. The higher per cent of Cd complexed in the presence of DTPA revealed that DTPA is a stronger chelating agent than EDTA at acidic pHs. Whereas, the capability of complex formation by EDTA is lower at lower pH but higher at higher pH.
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Affiliation(s)
- Tanmoy Karak
- Upper Assam Advisory Centre, Tea Research Association, Dikom, Dibrugarh, Assam, 786101, India.
| | - Ranjit Kumar Paul
- Division of Statistical Genetics, Indian Agricultural Statistics Research Institute, New Delhi, 110012, India.
| | - Dilip Kumar Das
- Department of Agricultural Chemistry and Soil Science, Faculty of Agriculture, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, 741252, India
| | - Romesh Kumar Boruah
- Upper Assam Advisory Centre, Tea Research Association, Dikom, Dibrugarh, Assam, 786101, India
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Singh S, Fulzele DP, Kaushik CP. Potential of Vetiveria zizanoides L. Nash for phytoremediation of plutonium ((239)Pu): Chelate assisted uptake and translocation. Ecotoxicol Environ Saf 2016; 132:140-4. [PMID: 27318195 DOI: 10.1016/j.ecoenv.2016.05.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 01/19/2016] [Revised: 05/06/2016] [Accepted: 05/12/2016] [Indexed: 05/06/2023]
Abstract
Plants have demonstrated a great potential to remove toxic elements from soils and solutions and been successfully used for phytoremediation of important radionuclides. Uptake potential of vetiver plants (V. zizanoides) for the remediation of (239)Pu in hydroponic and soil conditions was studied in the present work. High efficiency of V. zizanoides for the removal of (239)Pu was recorded with 66.2% being removed from the hydroponic solution after 30 days. However, remediation of (239)Pu from soil was limited. Remediation of (239)Pu from soil was increased with the addition of chelating agents citric acid (CA) and diethylenetriaminepentaacetic acid (DTPA). Accumulation of (239)Pu was recorded higher in roots than shoots, however its translocation from roots to shoots increased in the presence of chelators in hydroponic as well as soil conditions. DTPA was found more effective than CA showing higher translocation index (TI). Increase in TI was observed 8 and 6 times in the solution and soil respectively when plants were exposed to (239)Pu-DTPA in comparison to only (239)Pu. The present study demonstrates that V. zizanoides plant is a potential plant for phytoremediation of (239)Pu.
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Affiliation(s)
- Shraddha Singh
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
| | - D P Fulzele
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - C P Kaushik
- Waste Management Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Isabettini S, Liebi M, Kohlbrecher J, Ishikawa T, Windhab EJ, Fischer P, Walde P, Kuster S. Tailoring Bicelle Morphology and Thermal Stability with Lanthanide-Chelating Cholesterol Conjugates. Langmuir 2016; 32:9005-9014. [PMID: 27529644 DOI: 10.1021/acs.langmuir.6b01968] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bicelles composed of DMPC and phospholipids capable of chelating lanthanide ions, such as 1,2-dimyristoyl-sn-glycero-3-phospho-ethanolamine-diethylene triaminepentaacetate (DMPE-DTPA), are highly tunable magnetically responsive soft materials. Further doping of these systems with cholesterol-DTPA conjugates complexed to a lanthanide ion considerably enhances the bicelle's size and magnetic alignability. The high value of these cholesterol conjugates for bicelle design remains largely unexplored. Herein, we examine how molecular structural alterations within the cholesterol-DTPA conjugates lead to contrasting self-assembled polymolecular aggregate structures when incorporated into DMPC/DMPE-DTPA/Tm(3+) bilayers. The nature of the linker connecting the DTPA-chelating moiety to the sterol backbone is examined by synthesizing conjugates of various linker lengths and polarities. The incorporation of these compounds within the bilayer results in polymolecular aggregate geometries of higher curvature. The increasing degrees of freedom for conformational changes conveyed to the chelator headgroup with increasing linker atomic length reduce the cholesterol-DTPA conjugate's critical packing parameter. Consequently, an inverse correlation between the number of carbon atoms in the linker and the bicelle radius is established. The introduction of polarity into the carbon chain of the linker did not cause major changes in the polymolecular aggregate architecture. Under specific conditions, the additives permit the formation of remarkably temperature-resistant bicelles. The versatility of design offered by these amphiphiles gives rise to new and viable tools for the growing field of magnetically responsive soft materials.
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Affiliation(s)
- Stéphane Isabettini
- Laboratory of Food Process Engineering, ETH Zurich , Schmelzbergstrasse 9, 8092 Zurich, Switzerland
| | | | | | | | - Erich J Windhab
- Laboratory of Food Process Engineering, ETH Zurich , Schmelzbergstrasse 9, 8092 Zurich, Switzerland
| | - Peter Fischer
- Laboratory of Food Process Engineering, ETH Zurich , Schmelzbergstrasse 9, 8092 Zurich, Switzerland
| | - Peter Walde
- Department of Materials, ETH Zurich , Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Simon Kuster
- Laboratory of Food Process Engineering, ETH Zurich , Schmelzbergstrasse 9, 8092 Zurich, Switzerland
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Ramzani PMA, Khalid M, Naveed M, Ahmad R, Shahid M. Iron biofortification of wheat grains through integrated use of organic and chemical fertilizers in pH affected calcareous soil. Plant Physiol Biochem 2016; 104:284-93. [PMID: 27179316 DOI: 10.1016/j.plaphy.2016.04.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 01/20/2016] [Revised: 04/29/2016] [Accepted: 04/29/2016] [Indexed: 05/16/2023]
Abstract
Incidence of iron (Fe) deficiency in human populations is an emerging global challenge. This study was conducted to evaluate the potential of iron sulphate combined with biochar and poultry manure for Fe biofortification of wheat grains in pH affected calcareous soil. In first two incubation studies, rates of sulfur (S) and Fe combined with various organic amendments for lowering pH and Fe availability in calcareous soil were optimized. In pot experiment, best rate of Fe along with biochar (BC) and poultry manure (PM) was evaluated for Fe biofortification of wheat in normal and S treated low pH calcareous soil. Fe applied with BC provided fair increase in root-shoot biomass and photosynthesis up to 79, 53 and 67%, respectively in S treated low pH soil than control. Grain Fe and ferritin concentration was increased up to 1.4 and 1.2 fold, respectively while phytate and polyphenol was decreased 35 and 44%, respectively than control in treatment where Fe was applied with BC and S. In conclusion, combined use of Fe and BC could be an effective approach to improve growth and grain Fe biofortification of wheat in pH affected calcareous soil.
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Affiliation(s)
| | - Muhammad Khalid
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38040, Pakistan
| | - Muhammad Naveed
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, 38040, Pakistan.
| | - Rashid Ahmad
- Department of Agronomy, University of Agriculture Faisalabad, 38040, Pakistan
| | - Muhammad Shahid
- Department of Biochemistry, University of Agriculture Faisalabad, 38040, Pakistan
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Kuprienko OS, Dubovskaya LV, Shabunya PS, Fatykhava SA, Sviridov OV. [Functionalized Metal Chelates Based on Diethylenetriaminetetraacetic Acids for Chemical Modification of Proteins and Small Biomolecules]. Bioorg Khim 2016; 41:675-85. [PMID: 27125021 DOI: 10.1134/s1068162015060072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Bifunctional reagents based on diethylenetriaminetetraacetic acid containing a bound metal ion and a reactive functional group for the interaction with proteins and low-molecular-weight substances have been synthesized. An Amino-derivative of a complexonate was obtained by acylation of monosubstituted diamine with diethylenetriaminepentaacetic acid dianhydride followed by deprotection ofthe amino group, purification by anion exchange chromatography and chelation of Eu3+. This metal chelate derivative was used for labeling 17α-hydroxyprogesterone 3-(O-carboxymethyl)oxime and horseradish peroxidase. The enzyme modified with the Eu3+ complexonate at the carbohydrate component and with a cortisol derivative at the polypeptide chain was used in a dissociation-enhanced lanthanide fluorescent immunoassay (DELFIA) as well as in an enzyme immunoassay of the steroid hormone. DELFIA showed that labeled 17α-hydroxyprogesterone retained the affinity for corresponding antibodies. A Eu(3+)-complexonate carboxy-derivative N-succinimide ester was obtained by acylation of the aminochelate with p-phthalic acid di-N-succinimide ester. It was used for modification of amino groups of lysine residues in polypeptide chains of human serum albumin and some immunoglobulins G. Purification of Eu3+ complexonate-protein conjugates by gel-chromatography on a Superose- 12 column allowed to separate the modified proteins from unreacted low molecular weight Eu(3+)-derivatives and to determine a degree of lanthanide inclusion into a protein. The amount of Eu3+ covalently attached to a protein was determined by measuring the fluorescence of a conjugate in the dissociative-enhancement solution. The obtained values correlated well with the results of ICP-MS determination of Eu3+ concentration in a conjugate solution. It was shown that conjugates of monoclonal antibodies obtained by the proposed method possessed the required characteristics of fluorescence intensity, signal-to-noise ratio, sensitivity and specificity in DELFIA medical diagnostic systems.
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Sadowska M, Biaduń E, Krasnodębska-Ostręga B. Stability of Tl(III) in the context of speciation analysis of thallium in plants. Chemosphere 2016; 144:1216-23. [PMID: 26465967 DOI: 10.1016/j.chemosphere.2015.09.079] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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: 06/18/2015] [Revised: 09/03/2015] [Accepted: 09/22/2015] [Indexed: 05/28/2023]
Abstract
The paper presents both "good" and "bad" results obtained during speciation analysis of thallium in plant tissues of a hyperaccumulator of this metal. The object was white mustard - Sinapis alba L. In this plant there were found traces of trivalent thallium. The crucial point of this study (especially in the case of so unstable thallium form as Tl(III)) was to prove that the presence of Tl(III) was not caused by the procedure of sample preparation itself, and that the whole analytical method provides reliable results. Choice of the method for conservation of the initial speciation, extraction with the highest efficiency and proving the correctness of the obtained data were the most difficult parts of the presented study. It was found that: both freezing and drying cause significant changes in the speciation of thallium; quantitative analysis could be performed only with fresh tissues of mustard plants; only short-term storage of an extract from fresh plant tissues is possible; the methodology is not the source of thallium (III); only the presence of DTPA can greatly limit the reduction of TI(III) to TI(I) (up to 1-3%); the UV irradiation results in disintegration of TI(III)DTPA in the presence of plant matrix (reduction up to 90%).
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Affiliation(s)
- Monika Sadowska
- Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093 Warsaw, Poland
| | - Ewa Biaduń
- Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093 Warsaw, Poland
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Zang Y, Wei X, Hao M. Long-Term Effect of Crop Rotation and Fertilisation on Bioavailability and Fractionation of Copper in Soil on the Loess Plateau in Northwest China. PLoS One 2015; 10:e0145370. [PMID: 26694965 PMCID: PMC4687829 DOI: 10.1371/journal.pone.0145370] [Citation(s) in RCA: 6] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 12/01/2015] [Indexed: 12/02/2022] Open
Abstract
The bioavailability and fractionation of Cu reflect its deliverability in soil. Little research has investigated Cu supply to crops in soil under long-term rotation and fertilisation on the Loess Plateau. A field experiment was conducted in randomized complete block design to determine the bioavailability and distribution of Cu fractions in a Heilu soil (Calcaric Regosol) after 18 years of rotation and fertilisation. The experiment started in 1984, including five cropping systems (fallow control, alfalfa cropping, maize cropping, winter wheat cropping, and grain-legume rotation of pea/winter wheat/winter wheat + millet) and five fertiliser treatments (unfertilised control, N, P, N + P, and N + P + manure). Soil samples were collected in 2002 for chemical analysis. Available Cu was assessed by diethylene triamine pentaacetic acid (DTPA) extraction, and Cu was fractionated by sequential extraction. Results showed that DTPA-Cu was lower in cropping systems compared with fallow control. Application of fertilisers resulted in no remarkable changes in DTPA-Cu compared with unfertilised control. Correlation and path analyses revealed that soil pH and CaCO3 directly affected Cu bioavailability, whereas available P indirectly affected Cu bioavailability. The concentrations of Cu fractions (carbonate and Fe/Al oxides) in the plough layer were lower in cropping systems, while the values in the plough sole were higher under grain-legume rotation relative to fallow control. Manure with NP fertiliser increased Cu fractions bound to organic matter and minerals in the plough layer, and its effects in the plough sole varied with cropping systems. The direct sources (organic-matter-bound fraction and carbonate-bound fraction) of available Cu contributed much to Cu bioavailability. The mineral-bound fraction of Cu acted as an indicator of Cu supply potential in the soil.
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Affiliation(s)
- Yifei Zang
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, China
| | - Xiaorong Wei
- Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, China
| | - Mingde Hao
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, China
- Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, China
- * E-mail:
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Deshmukh SK, Singh AK, Datta SP. Impact of wastewater irrigation on the dynamics of metal concentration in the vadose zone: simulation with NETPATH--part II. Environ Monit Assess 2015; 187:764. [PMID: 26585958 DOI: 10.1007/s10661-015-4962-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 03/18/2015] [Accepted: 11/02/2015] [Indexed: 05/28/2023]
Abstract
Understanding and quantification of geochemical processes in vadose zone of sewage-effluent-irrigated soils are helpful in predicting the transference of metals and other ions to food chain and groundwater. Hence, an attempt has been made to simulate various geochemical processes occurring in the flow path of infiltrating sewage water down the vadose zone with the help of Net Geochemical Reaction Along the Flow Path (NETPATH). This study area was located in Western Delhi, India, where sewage effluents originating from Keshopur Sewage Treatment plant have been used for irrigation since 1979. Agricultural lands receiving irrigation through sewage and tube well water were selected for this study. The results indicated that groundwater of 20- and 10-year sewage-irrigated lands was slightly oversaturated in respect of calcite and dolomite, and undersaturated in respect of gypsum. The shallow groundwater of 5-year sewage-irrigated field was undersaturated in case of calcite, dolomite, and gypsum. Among the metals, major focus was given on Fe and Mn as these two metals are redox prone and relatively more mobile than other metals under saturated conditions. There was reduction in concentration of Fe and Mn in groundwater samples of 20-year sewage-irrigated field as compared to that in sewage effluent. Such reduction in concentration of Fe and Mn could be ascribed to the formation of goethite and manganite in vadose zone, respectively, as revealed by simulation with NETPATH. Similarly, in case of 10- and 5-year sewage-irrigated fields, increase in Fe and Mn concentrations in groundwater was due to dissolution of siderite and pyrulusite, respectively. NETPATH software could explain the variation in diethylene triamine pentaacetic acid (DTPA)-extractable Fe and Mn content in vadose zone to the extent of 94 and 65%, respectively.
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Affiliation(s)
| | - Anil Kumar Singh
- Rajmata Vijayaraje Schindia Agricultural University, Gwalior, Madhya Pradesh, India.
| | - Siba Prasad Datta
- Division of Soil Science and Agricultural Chemistry, Indian Agriculture Research Institute, New Delhi, 110012, India.
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Hamza Y, Sulieman A, Abuderman A, Alzimami K, Omer H. Evaluation of patient effective doses in CT urography, intravenous urography and renal scintigraphy. Radiat Prot Dosimetry 2015; 165:452-456. [PMID: 25883305 DOI: 10.1093/rpd/ncv115] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Imaging of the renal system is performed with different techniques depending mainly on clinical symptoms and signs. This study intended to evaluate patient effective doses undergoing renal scintigraphy (technetium-99m-diethylene-triamine-pentaacetic acid), computed tomography urography (CTU) and intravenous urography (IVU). A total of 60 patients were evaluated using Orbiter 37 Gamma camera single head, dual-slice CT scanner and conventional X-ray machine with computed radiography (CR) processing unit. Patients effective dose were estimated using the administered activity, DosCal software and dose length product value for renal scan, IVU and CTU procedures, respectively. Patients' effective doses during renal scan, CTU and IVU procedures were 0.78 ± 0.18, 2.53 ± 0.94 and 1.81 ± 0.20 mSv, in that order. Patients were exposed to a higher effective dose during CTU compared with other two procedures. Patient doses depend on the size of patient, the type of scanner and the imaging protocol used. Effective doses considered low compared with previous studies.
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Affiliation(s)
- Y Hamza
- Basic Science Department, College of Medical Radiologic Sciences, Sudan University of Science and Technology, P.O. Box 1908, Khartoum, Sudan
| | - A Sulieman
- Basic Science Department, College of Medical Radiologic Sciences, Sudan University of Science and Technology, P.O. Box 1908, Khartoum, Sudan Radiology and Medical Imaging Department, College of Applied Medical Sciences, Prince Sattam bin Abdulaziz University, P.O. Box 422, Alkharj, Kingdom of Saudi Arabia
| | - A Abuderman
- Department of Basic Medical Sciences, College of Medicine, Prince Sattam bin Abdulaziz University, Alkharj, Kingdom of Saudi Arabia
| | - K Alzimami
- Radiological Sciences Department, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Kingdom of Saudi Arabia
| | - H Omer
- Faculty of Medicine, Dammam University, Dammam, Kingdom of Saudi Arabia
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Kong D, Qin C, Fan P, Li B, Wang J. Spectroscopic studies on interaction of BSA and Eu(III) complexes with H5ph-dtpa and H5dtpa ligands. Spectrochim Acta A Mol Biomol Spectrosc 2015; 140:372-381. [PMID: 25617848 DOI: 10.1016/j.saa.2015.01.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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: 11/03/2014] [Accepted: 01/05/2015] [Indexed: 06/04/2023]
Abstract
An novel aromatic aminopolycarboxylic acid ligand, N-(2-N,N-Dicarboxymethylaminophenyl) ethylenediamine-N,N',N'-triacetic acid (H5ph-dtpa), was synthesized by improving experimental method and its corresponding Eu(III) complex, Na2[EuIII(ph-dtpa)(H2O)]·6H2O, was successfully prepared through heat-refluxing method. As a comparison, the Eu(III) complex with diethylenetriamine-N,N,N',N',N″-pentaacetic acid (H5dtpa) ligand, Na2[Eu(III)(dtpa)(H2O)]·6H2O, was also prepared by the same method. And then, the interaction between prepared Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) and bovine serum albumin (BSA) in aqueous solution were studied by the combination of ultraviolet-visible (UV-vis), fluorescence and circular dichroism (CD) spectroscopies. In addition, the binding sites of Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) to BSA molecules were also estimated by synchronous fluorescence. Moreover, the theoretical and experimental results show that the Van der Waals, hydrogen bond and π-π stacking interactions are the mainly impulse to the reaction. The binding distances (r) between Eu(III) complexes ([EuIII(dtpa)(H2O)]2- and [EuIII(ph-dtpa)(H2O)]2-) and BSA were obtained according to Förster's non-radiative energy transfer theory. Also, the determined UV-vis absorption spectroscopy, synchronous fluorescence and circular dichroism (CD) spectra showed that the conformation of BSA could be changed in the presence of Eu(III) complexes. The obtained results can help understand the action mode between rare earth metal complexes of aminopolycarboxylic acid ligands with BSA and they are also expected to provide important information of designs of new inspired drugs.
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Affiliation(s)
- Deyong Kong
- College of Chemistry, Liaoning University, Shenyang 110036, PR China
| | - Cui Qin
- College of Chemistry, Liaoning University, Shenyang 110036, PR China
| | - Ping Fan
- College of Chemistry, Liaoning University, Shenyang 110036, PR China
| | - Bing Li
- College of Chemistry, Liaoning University, Shenyang 110036, PR China
| | - Jun Wang
- College of Chemistry, Liaoning University, Shenyang 110036, PR China.
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Zhao S, Shen Z, Duo L. Heavy metal uptake and leaching from polluted soil using permeable barrier in DTPA-assisted phytoextraction. Environ Sci Pollut Res Int 2015; 22:5263-5270. [PMID: 25354438 DOI: 10.1007/s11356-014-3751-5] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Accepted: 10/16/2014] [Indexed: 06/04/2023]
Abstract
Application of sewage sludge (SS) in agriculture is an alternative technique of disposing this waste. But unreasonable application of SS leads to excessive accumulation of heavy metals in soils. A column experiment was conducted to test the availability of heavy metals to Lolium perenne grown in SS-treated soils following diethylene triamine penta acetic acid (DTPA) application at rates of 0, 10 and 20 mmol kg(-1) soil. In order to prevent metal leaching in DTPA-assisted phytoextraction process, a horizontal permeable barrier was placed below the treated soil, and its effectiveness was also assessed. Results showed that DTPA addition significantly increased metal uptake by L. perenne shoots and metal leaching. Permeable barriers increased metal concentrations in plant shoots and effectively decreased metal leaching from the treated soil. Heavy metals in SS-treated soils could be gradually removed by harvesting L. perenne many times in 1 year and adding low dosage of DTPA days before each harvest.
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Affiliation(s)
- Shulan Zhao
- Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, 393 Binshuixi Road, Xiqing District, Tianjin, 300387, People's Republic of China
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Liu Y, Li J, Liu F, Feng L, Yu D, Zhang N. Theranostic Polymeric Micelles for the Diagnosis and Treatment of Hepatocellular Carcinoma. J Biomed Nanotechnol 2015; 11:613-22. [PMID: 26310068 DOI: 10.1166/jbn.2015.1945] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Theranostics, which combine molecular imaging (diagnostics) and drug delivery (therapeutics) in a single platform, have recently shown great potential in cancer therapy. In this article, a polymeric micelle was designed and prepared for simultaneous magnetic resonance imaging (MRI) and treatment of hepatocellular carcinoma (HCC). Theranostic micelles were assembled using Poly(lactic acid)-poly(ethylene glycol)-poly(L-lysine)-diethylenetriamine pentaacetic acid (PLA-PEG-PLL-DTPA) and PLA-PEG-PLL-Biotin. The HCC therapeutic paclitaxel (PTX) was encapsulated in the cores and Gd ions for imaging were chelated to the DTPA moieties. Biotinylated alpha-fetoprotein (AFP) antibodies were linked to the micelle surface by a biotin-avidin reaction to form targeted Gd/PTX-loaded micelles (TGPM). TGPM were of spherical or ellipsoidal shape with uniform particle size distribution (147.50 ± 4.71 nm), positive zeta potential (24.45 ± 1.04 mV), and high encapsulation efficiency (88.76 ± 1.64%) and drug loading (1.59 ± 0.06%). The cytotoxicity of TGPM in HepG2 cells was superior to that of Taxol or Gd/PTX-loaded micelles (GPM). In MRI tests in vitro, the T1 relaxivity of TGPM was 21.589 mM(-1) s(-1), 4.4 times higher than Magnevist (r1 = 4.8 mM(-1) s(-1)). In H22 tumor-bearing mice, TGPM significantly increased tumor imaging intensity (more than 3 times) and prolonged imaging time (from 1 to 6 h) compared to Magnevist. In vivo, TGPM exhibited higher anti-tumor efficiency than Taxol and GPM. These results indicate that TGPM has great potential in HCC theranostics.
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Wilson JP, Cobb RR, Dungan NW, Matthews LL, Eppler B, Aiello KV, Curtis S, Boger T, Guilmette RA, Weber W, Doyle-Eisele M, Talton JD. Decorporation of systemically distributed americium by a novel orally administered diethylenetriaminepentaacetic acid (DTPA) formulation in beagle dogs. Health Phys 2015; 108:308-318. [PMID: 25627942 DOI: 10.1097/hp.0000000000000199] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Novel decorporation agents are being developed to protect against radiological accidents and terrorists attacks. Radioactive americium is a significant component of nuclear fallout. Removal of large radioactive materials, such as 241Am, from exposed persons is a subject of significant interest due to the hazards they pose. The objective of this study was to evaluate the dose-related efficacy of daily doses of NanoDTPA™ Capsules for decorporating Am administered intravenously as a soluble citrate complex to male and female beagle dogs. In addition, the efficacy of the NanoDTPA™ Capsules for decorporating 241Am was directly compared to intravenously administered saline and DTPA. Animals received a single IV administration of 241Am(III)-citrate on Day 0. One day after radionuclide administration, one of four different doses of NanoDTPA™ Capsules [1, 2, or 6 capsules d(-1) (30 mg, 60 mg, or 180 mg DTPA) or 2 capsules BID], IV Zn-DTPA (5 mg kg(-1) pentetate zinc trisodium) as a positive control, or IV saline as a placebo were administered. NanoDTPA™ Capsules, IV Zn-DTPA, or IV saline was administered on study days 1-14. Animals were euthanized on day 21. A full necropsy was conducted, and liver, spleen, kidneys, lungs and trachea, tracheobronchial lymph nodes (TBLN), muscle samples (right and left quadriceps), gastrointestinal (GI) tract (stomach plus esophagus, upper and lower intestine), gonads, two femurs, lumbar vertebrae (L1-L4), and all other soft tissue remains were collected. Urinary and fecal excretion profiles were increased approximately 10-fold compared to those for untreated animals. Tissue contents were decreased compared to untreated controls. In particular, liver content was decreased by approximately eightfold compared to untreated animals. The results from this study further demonstrate that oral NanoDTPA™ Capsules are equally efficient compared to IV Zn-DTPA in decorporation of actinides.
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Affiliation(s)
- James P Wilson
- *Nanotherapeutics, Inc., Alachua, FL 32615; †Lovelace Biomedical and Environmental Research Institute, Albuquerque, NM
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Severin GW, Jørgensen JT, Wiehr S, Rolle AM, Hansen AE, Maurer A, Hasenberg M, Pichler B, Kjær A, Jensen AI. The impact of weakly bound ⁸⁹Zr on preclinical studies: non-specific accumulation in solid tumors and aspergillus infection. Nucl Med Biol 2014; 42:360-8. [PMID: 25583221 DOI: 10.1016/j.nucmedbio.2014.11.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [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: 09/10/2014] [Revised: 11/11/2014] [Accepted: 11/14/2014] [Indexed: 01/12/2023]
Abstract
UNLABELLED Preclinical studies involving (89)Zr often report significant bone accumulation, which is associated with dissociation of the radiometal from the tracer. However, experiments determining the uptake of unbound (89)Zr in disease models are not performed as routine controls. The purpose of the present study was to investigate the impact of free or weakly bound (89)Zr on PET quantifications in disease models, in order to determine if such control experiments are warranted. METHODS Chemical studies were carried out to find a (89)Zr compound that would solubilize the (89)Zr as a weak chelate, thus mimicking free or weakly bound (89)Zr released in circulation. (89)Zr oxalate had the desired characteristics, and was injected into mice bearing FaDu and HT29 solid tumor xenografts, and mice infected in the lungs with the mold Aspergillus fumigatus, as well as in healthy controls (naïve). PET/CT or PET/MR imaging followed to quantify the distribution of the radionuclide in the disease models. RESULTS (89)Zr oxalate was found to have a plasma half-life of 5.1 ± 2.3 h, accumulating mainly in the bones of all animals. Both tumor types accumulated (89)Zr on the order of 2-4 %ID/cm(3), which is comparable to EPR-mediated accumulation of certain species. In the aspergillosis model, the concentration of (89)Zr in lung tissue of the naïve animals was 6.0 ± 1.1 %ID/g. This was significantly different from that of the animals with advanced disease, showing 11.6 ± 1.8 %ID/g. CONCLUSIONS Given the high levels of (89)Zr accumulation in the disease sites in the present study, we recommend control experiments mapping the biodistribution of free (89)Zr in any preclinical study employing (89)Zr where bone uptake is observed. Aqueous (89)Zr oxalate appears to be a suitable compound for such studies. This is especially relevant in studies where the tracer accumulation is based upon passive targeting, such as EPR.
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Affiliation(s)
- Gregory W Severin
- The Hevesy Laboratory, DTU Nutech, Technical University of Denmark; Center for Nanomedicine and Theranostics, Technical University of Denmark
| | - Jesper T Jørgensen
- Dept. of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet and Cluster for Molecular Imaging, Faculty of Health Science, University of Copenhagen, Denmark
| | - Stefan Wiehr
- Werner Siemens Imaging Center, Department for Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Anna-Maria Rolle
- Werner Siemens Imaging Center, Department for Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Anders E Hansen
- Dept. of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet and Cluster for Molecular Imaging, Faculty of Health Science, University of Copenhagen, Denmark; Center for Nanomedicine and Theranostics, Technical University of Denmark; Department of Micro- and Nanotechnology, DTU Nanotech, Technical University of Denmark
| | - Andreas Maurer
- Werner Siemens Imaging Center, Department for Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Mike Hasenberg
- University Duisburg-Essen, University Hospital, Institute for Experimental Immunology and Imaging, Essen, Germany
| | - Bernd Pichler
- Werner Siemens Imaging Center, Department for Preclinical Imaging and Radiopharmacy, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Andreas Kjær
- Dept. of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet and Cluster for Molecular Imaging, Faculty of Health Science, University of Copenhagen, Denmark
| | - Andreas I Jensen
- The Hevesy Laboratory, DTU Nutech, Technical University of Denmark; Center for Nanomedicine and Theranostics, Technical University of Denmark.
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Yang YT, Di Pasqua AJ, Zhang Y, Sueda K, Jay M. Solid dispersions of the penta-ethyl ester prodrug of diethylenetriaminepentaacetic acid (DTPA): formulation design and optimization studies. Pharm Dev Technol 2014; 19:806-12. [PMID: 24047113 PMCID: PMC4620067 DOI: 10.3109/10837450.2013.836216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The penta-ethyl ester prodrug of diethylenetriaminepentaacetic acid (DTPA), which exists as an oily liquid, was incorporated into a solid dispersion for oral administration by the solvent evaporation method using blends of polyvinylpyrrolidone (PVP), Eudragit® RL PO and α-tocopherol. D-optimal mixture design was used to optimize the formulation. Formulations that had a high concentration of both Eudragit® RL PO and α-tocopherol exhibited low water absorption and enhanced stability of the DTPA prodrug. Physicochemical properties of the optimal formulation were evaluated using Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC). In vitro release of the prodrug was evaluated using the USP Type II apparatus dissolution method. DSC studies indicated that the matrix had an amorphous structure, while FTIR spectrometry showed that DTPA penta-ethyl ester and excipients did not react with each other during formation of the solid dispersion. Dissolution testing showed that the optimized solid dispersion exhibited a prolonged release profile, which could potentially result in a sustained delivery of DTPA penta-ethyl to enhance bioavailability. In conclusion, DTPA penta-ethyl ester was successfully incorporated into a solid matrix with high drug loading and improved stability compared to prodrug alone.
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Affiliation(s)
- Yu-Tsai Yang
- Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7362, U.S.A
| | - Anthony J. Di Pasqua
- Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7362, U.S.A
| | - Yong Zhang
- Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7362, U.S.A
| | - Katsuhiko Sueda
- Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7362, U.S.A
| | - Michael Jay
- Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7362, U.S.A
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Elshan NGRD, Patek R, Vagner J, Mash EA. Spectrophotometric determination and removal of unchelated europium ions from solutions containing Eu-diethylenetriaminepentaacetic acid chelate-peptide conjugates. Anal Biochem 2014; 464:24-9. [PMID: 25058927 PMCID: PMC4172531 DOI: 10.1016/j.ab.2014.07.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 06/20/2014] [Accepted: 07/12/2014] [Indexed: 10/25/2022]
Abstract
Europium chelates conjugated with peptide ligands are routinely used as probes for conducting in vitro binding experiments. The presence of unchelated Eu ions in these formulations gives high background luminescence and can lead to poor results in binding assays. In our experience, the reported methods for purification of these probes do not achieve adequate removal of unchelated metal ions in a reliable manner. In this work, a xylenol orange-based assay for the quantification of unchelated metal ions was streamlined and used to determine levels of metal ion contamination as well as the success of metal ion removal on attempted purification. We compared the use of Empore chelating disks and Chelex 100 resin for the selective removal of unchelated Eu ions from several Eu-diethylenetriaminepentaacetic acid chelate-peptide conjugates. Both purification methods gave complete and selective removal of the contaminant metal ions. However, Empore chelating disks were found to give much higher recoveries of the probes under the conditions used. Related to the issue of probe recovery, we also describe a significantly more efficient method for the synthesis of one such probe using Rink amide AM resin in place of Tentagel S resin.
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Affiliation(s)
- N G R Dayan Elshan
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA
| | - Renata Patek
- The Bio5 Institute, University of Arizona, Tucson, AZ 85721, USA
| | - Josef Vagner
- The Bio5 Institute, University of Arizona, Tucson, AZ 85721, USA
| | - Eugene A Mash
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA.
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Kanazaki K, Sano K, Makino A, Takahashi A, Deguchi J, Ohashi M, Temma T, Ono M, Saji H. Development of human serum albumin conjugated with near-infrared dye for photoacoustic tumor imaging. J Biomed Opt 2014; 19:96002. [PMID: 25191833 DOI: 10.1117/1.jbo.19.9.096002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 08/12/2014] [Indexed: 06/03/2023]
Abstract
Photoacoustic (PA) imaging has emerged as a noninvasive diagnostic method which detects ultrasonic waves thermoelastically induced by optical absorbers irradiated with laser. For tumor diagnosis, PA contrast agent has been proposed to enhance the PA effect for detecting tumors sensitively. Here, we prepared a human serum albumin (HSA) conjugated with indocyanine green (ICG) as a PA contrast agent allowing enhanced permeability and retention effect for sensitive tumor imaging. The feasibility of PA imaging with HSA-ICG to detect allografted tumors was evaluated in tumor-bearing mice. In vivo fluorescence imaging and radiolabeled biodistribution study showed that the biodistribution dramatically changed as the number of ICG bound to HSA increased, and the maximum accumulation of ICG was achieved when around three ICG molecules were loaded on an HSA. In vivo PA imaging demonstrated a tumor-selective and dose-dependent increase of PA signal intensity in mice injected with HSA-ICG (R2 = 0.88, 387% increase for HSA-ICG, 104 nmol ICG). In conclusion, HSA-ICG clearly visualized the allografted tumors with high tumor-to-background ratios having high quantitative and spatial resolution for the sensitive PA imaging of tumors. HSA-ICG could be useful as a favorable contrast agent for PA tumor imaging for the management of cancer.
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Affiliation(s)
- Kengo Kanazaki
- Canon Inc., Medical Imaging Project, Corporate R&D Headquarters, 3-30-2 Shimomaruko, Ohta-ku, Tokyo 146-8501, Japan
| | - Kohei Sano
- Kyoto University, Department of Patho-Functional Bioanalysis Graduate School of Pharmaceutical Sciences, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, JapancKyoto University Hospital, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
| | - Akira Makino
- Kyoto University, Department of Patho-Functional Bioanalysis Graduate School of Pharmaceutical Sciences, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, JapandUniversity of Fukui, Biomedical Imaging Research Center, 23-3 Matsuokashimoaizuki, Eihe
| | - Atsushi Takahashi
- Canon Inc., Medical Imaging Project, Corporate R&D Headquarters, 3-30-2 Shimomaruko, Ohta-ku, Tokyo 146-8501, Japan
| | - Jun Deguchi
- Kyoto University, Department of Patho-Functional Bioanalysis Graduate School of Pharmaceutical Sciences, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Manami Ohashi
- Kyoto University, Department of Patho-Functional Bioanalysis Graduate School of Pharmaceutical Sciences, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Takashi Temma
- Kyoto University, Department of Patho-Functional Bioanalysis Graduate School of Pharmaceutical Sciences, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masahiro Ono
- Kyoto University, Department of Patho-Functional Bioanalysis Graduate School of Pharmaceutical Sciences, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hideo Saji
- Kyoto University, Department of Patho-Functional Bioanalysis Graduate School of Pharmaceutical Sciences, 46-29 Yoshida Shimoadachi-cho, Sakyo-ku, Kyoto 606-8501, Japan
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Aghili F, Gamper HA, Eikenberg J, Khoshgoftarmanesh AH, Afyuni M, Schulin R, Jansa J, Frossard E. Green manure addition to soil increases grain zinc concentration in bread wheat. PLoS One 2014; 9:e101487. [PMID: 24999738 PMCID: PMC4084887 DOI: 10.1371/journal.pone.0101487] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 06/07/2014] [Indexed: 11/18/2022] Open
Abstract
Zinc (Zn) deficiency is a major problem for many people living on wheat-based diets. Here, we explored whether addition of green manure of red clover and sunflower to a calcareous soil or inoculating a non-indigenous arbuscular mycorrhizal fungal (AMF) strain may increase grain Zn concentration in bread wheat. For this purpose we performed a multifactorial pot experiment, in which the effects of two green manures (red clover, sunflower), ZnSO4 application, soil γ-irradiation (elimination of naturally occurring AMF), and AMF inoculation were tested. Both green manures were labeled with 65Zn radiotracer to record the Zn recoveries in the aboveground plant biomass. Application of ZnSO4 fertilizer increased grain Zn concentration from 20 to 39 mg Zn kg-1 and sole addition of green manure of sunflower to soil raised grain Zn concentration to 31 mg Zn kg-1. Adding the two together to soil increased grain Zn concentration even further to 54 mg Zn kg-1. Mixing green manure of sunflower to soil mobilized additional 48 µg Zn (kg soil)-1 for transfer to the aboveground plant biomass, compared to the total of 132 µg Zn (kg soil)-1 taken up from plain soil when neither green manure nor ZnSO4 were applied. Green manure amendments to soil also raised the DTPA-extractable Zn in soil. Inoculating a non-indigenous AMF did not increase plant Zn uptake. The study thus showed that organic matter amendments to soil can contribute to a better utilization of naturally stocked soil micronutrients, and thereby reduce any need for major external inputs.
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Affiliation(s)
- Forough Aghili
- Institute of Agricultural Sciences, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH) Zürich, Switzerland
| | - Hannes A. Gamper
- Institute of Agricultural Sciences, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH) Zürich, Switzerland
| | - Jost Eikenberg
- Paul Scherrer Institute (PSI), Radioanalytics Laboratory, Villigen, Switzerland
| | - Amir H. Khoshgoftarmanesh
- College of Agriculture, Department of Soil Sciences, Isfahan University of Technology, Isfahan, Iran
| | - Majid Afyuni
- College of Agriculture, Department of Soil Sciences, Isfahan University of Technology, Isfahan, Iran
| | - Rainer Schulin
- Institute of Terrestrial Ecosystems, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH) Zürich, Switzerland
| | - Jan Jansa
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Emmanuel Frossard
- Institute of Agricultural Sciences, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH) Zürich, Switzerland
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50
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Nichols B, Qin Z, Yang J, Vera DR, Devaraj NK. 68Ga chelating bioorthogonal tetrazine polymers for the multistep labeling of cancer biomarkers. Chem Commun (Camb) 2014; 50:5215-5217. [PMID: 24589653 PMCID: PMC4119763 DOI: 10.1039/c3cc49530b] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [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: 11/21/2022]
Abstract
We have developed a (68)Ga metal chelating bioorthogonal tetrazine dextran probe that is highly reactive with trans-cyclooctene modified monoclonal antibodies for multistep imaging applications. Confocal microscopy and positron emission tomography (PET) were used to characterize the dextran probe in vitro and in vivo.
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Affiliation(s)
- Brandon Nichols
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Zhengtao Qin
- Department of Radiology, UCSD in vivo Cancer and Molecular Imaging Center, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Jun Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093, USA
| | - David R. Vera
- Department of Radiology, UCSD in vivo Cancer and Molecular Imaging Center, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Neal K. Devaraj
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093, USA
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