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Venkatesh V, Kumaran MDB, Saravanan RK, Kalaichelvan PT, Verma S. Luminescent Silver-Purine Double Helicate: Synthesis, Self-Assembly and Antibacterial Action. Chempluschem 2016; 81:1266-1271. [PMID: 31964074 DOI: 10.1002/cplu.201600293] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 06/27/2016] [Accepted: 07/21/2016] [Indexed: 12/22/2022]
Abstract
The synthesis, self-assembly and antibacterial activity of a luminescent silver-purine double helicate is reported. The structure of the newly synthesized silver-supported helicate [C36 H24 N16 O4 Cl5 Ag1 ] was unambiguously characterized by single-crystal X-ray crystallography. It exhibited a bright bluish-green emission (λmax =460 nm), when excited with 380 nm light. Microscopic investigations showed that the complex has a propensity to self-assemble into nanospheres. The antibacterial activity of this silver-containing helicate was studied against both Gram-positive and Gram-negative bacteria. MIC (minimal inhibitory concentration) values showed that the complex is very active against Gram-negative bacteria. Further internalization of the silver complex into E. coli bacteria was mapped with the help of microscopic techniques. These results are significant as silver was recently found to enhance antibiotic action against Gram-negative bacteria, raising hope in countering severe bacterial infections.
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Affiliation(s)
- V Venkatesh
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, UP, India.,Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK
| | - M D Bala Kumaran
- Centre for Advanced Studies in Botany, Guindy Campus, University of Madras, Chennai, 600025, TN, India.,Deapartment of Biotechnology, D. G. Vaishnav College, Chennai, 600106, TN, India
| | - R Kamal Saravanan
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, UP, India
| | - P T Kalaichelvan
- Centre for Advanced Studies in Botany, Guindy Campus, University of Madras, Chennai, 600025, TN, India
| | - Sandeep Verma
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, UP, India
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52
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Kumar J, Pratibha, Verma S. Crystallographic signatures of silver-purine frameworks with an azide functionality. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.03.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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53
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Santiago-Gonzalez B, Monguzzi A, Azpiroz JM, Prato M, Erratico S, Campione M, Lorenzi R, Pedrini J, Santambrogio C, Torrente Y, De Angelis F, Meinardi F, Brovelli S. Permanent excimer superstructures by supramolecular networking of metal quantum clusters. Science 2016; 353:571-5. [PMID: 27493181 DOI: 10.1126/science.aaf4924] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 07/13/2016] [Indexed: 01/20/2023]
Abstract
Excimers are evanescent quasi-particles that typically form during collisional intermolecular interactions and exist exclusively for their excited-state lifetime. We exploited the distinctive structure of metal quantum clusters to fabricate permanent excimer-like colloidal superstructures made of ground-state noninteracting gold cores, held together by a network of hydrogen bonds between their capping ligands. This previously unknown aggregation state of matter, studied through spectroscopic experiments and ab initio calculations, conveys the photophysics of excimers into stable nanoparticles, which overcome the intrinsic limitation of excimers in single-particle applications-that is, their nearly zero formation probability in ultra-diluted solutions. In vitro experiments demonstrate the suitability of the superstructures as nonresonant intracellular probes and further reveal their ability to scavenge reactive oxygen species, which enhances their potential as anticytotoxic agents for biomedical applications.
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Affiliation(s)
- Beatriz Santiago-Gonzalez
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Angelo Monguzzi
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
| | - Jon Mikel Azpiroz
- Computational Laboratory for Hybrid and Organic Photovoltaics, National Research Council-Institute of Molecular Science and Technologies (CNR-ISTM), Via Elce di Sotto 8, 06123 Perugia, Italy. Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), and Donostia International Physics Center, 20080 Donostia, Euskadi, Spain
| | - Mirko Prato
- Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
| | - Silvia Erratico
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Fondazione IRCCS (Istituto di Ricovero e Cura a Carattere Scientifico) Cá Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Via Francesco Sforza 35, 20122 Milano, Italy
| | - Marcello Campione
- Dipartimento di Scienze dell'Ambiente e del Territorio e di Scienze della Terra, Università degli Studi Milano-Bicocca, Piazza della Scienza, 20125 Milano, Italy
| | - Roberto Lorenzi
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Jacopo Pedrini
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Carlo Santambrogio
- Dipartimento di Biotecnologie e Bioscienze, Università degli Studi Milano-Bicocca, Piazza della Scienza, 2 20126 Milano, Italy
| | - Yvan Torrente
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Fondazione IRCCS (Istituto di Ricovero e Cura a Carattere Scientifico) Cá Granda Ospedale Maggiore Policlinico, Centro Dino Ferrari, Via Francesco Sforza 35, 20122 Milano, Italy
| | - Filippo De Angelis
- Computational Laboratory for Hybrid and Organic Photovoltaics, National Research Council-Institute of Molecular Science and Technologies (CNR-ISTM), Via Elce di Sotto 8, 06123 Perugia, Italy. Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
| | - Francesco Meinardi
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
| | - Sergio Brovelli
- Dipartimento di Scienza dei Materiali, Università degli Studi Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy.
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54
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West AL, Schaeublin NM, Griep MH, Maurer-Gardner EI, Cole DP, Fakner AM, Hussain SM, Karna SP. In situ Synthesis of Fluorescent Gold Nanoclusters by Nontumorigenic Microglial Cells. ACS APPLIED MATERIALS & INTERFACES 2016; 8:21221-21227. [PMID: 27328035 DOI: 10.1021/acsami.6b06624] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
To date, the directed in situ synthesis of fluorescent gold nanoclusters (AuNCs) has only been demonstrated in cancerous cells, with the theorized synthesis mechanism prohibiting AuNC formation in nontumorigenic cell lines. This limitation hinders potential biostabilized AuNC-based technology in healthy cells involving both chemical and mechanical analysis, such as the direct sensing of protein function and the elucidation of local mechanical environments. Thus, new synthesis strategies are required to expand the application space of AuNCs beyond cancer-focused cellular studies. In this contribution, we have developed the methodology and demonstrated the direct in situ synthesis of AuNCs in the nontumorigenic neuronal microglial line, C8B4. The as-synthesized AuNCs form in situ and are stabilized by cellular proteins. The clusters exhibit bright green fluorescence and demonstrate low (<10%) toxicity. Interestingly, elevated ROS levels were not required for the in situ formation of AuNCs, although intracellular reductants such as glutamate were required for the synthesis of AuNCs in C8B4 cells. To our knowledge, this is the first-ever demonstration of AuNC synthesis in nontumorigenic cells and, as such, it considerably expands the application space of biostabilized fluorescent AuNCs.
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Affiliation(s)
| | - Nicole M Schaeublin
- Molecular Bioeffects Branch, Bioeffects Division, Human Effectiveness Directorate, 711th Human Performance Wing, Air Force Research Laboratory , Wright-Patterson AFB, Ohio 45433, United States
| | | | - Elizabeth I Maurer-Gardner
- Molecular Bioeffects Branch, Bioeffects Division, Human Effectiveness Directorate, 711th Human Performance Wing, Air Force Research Laboratory , Wright-Patterson AFB, Ohio 45433, United States
| | | | | | - Saber M Hussain
- Molecular Bioeffects Branch, Bioeffects Division, Human Effectiveness Directorate, 711th Human Performance Wing, Air Force Research Laboratory , Wright-Patterson AFB, Ohio 45433, United States
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55
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Hu S, Ye B, Yi X, Cao Z, Wu D, Shen C, Wang J. Dumbbell-shaped metallothionein-templated silver nanoclusters with applications in cell imaging and Hg2+ sensing. Talanta 2016; 155:272-7. [DOI: 10.1016/j.talanta.2016.04.055] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 04/23/2016] [Accepted: 04/24/2016] [Indexed: 10/21/2022]
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56
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S. C, C. C, T. M, G. S, N. R. Biosurfactant templated quantum sized fluorescent gold nanoclusters for in vivo bioimaging in zebrafish embryos. Colloids Surf B Biointerfaces 2016; 143:472-480. [DOI: 10.1016/j.colsurfb.2016.03.067] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 03/22/2016] [Accepted: 03/23/2016] [Indexed: 12/17/2022]
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57
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Collier GS, Brown LA, Boone ES, Long BK, Kilbey SM. Synthesis of Main Chain Purine-Based Copolymers and Effects of Monomer Design on Thermal and Optical Properties. ACS Macro Lett 2016; 5:682-687. [PMID: 35614655 DOI: 10.1021/acsmacrolett.6b00275] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ability to incorporate diverse monomeric building blocks enables the development of advanced polymeric materials possessing a wide range of properties that suits them for myriad applications. Herein, that synthetic toolbox is expanded through the first report of purine-based copolymers in which purines are incorporated directly into the polymer main chain. Stille cross-coupling of dibromopurine monomers with benzodithiophene (BDT) comonomers is used to generate these "poly(purine)s", and variations in the substitution pattern of the purine monomer and BDT side-chains provides insight into the role of monomer design on their resultant thermal and photophysical properties. Specifically, thermal analyses show that poly(purine)s exhibit high thermal stability and high glass transition temperatures depending on the BDT side-chain substituents and substitution pattern of the purine-derived comonomer. Furthermore, optical properties measured via UV-vis and fluorescence spectroscopies show dependence on monomer substitution pattern. These findings demonstrate the viability of synthesizing poly(purine)s via metal-catalyzed cross-coupling reactions and highlight the potential to tailor poly(purine) properties via simple alterations of comonomers.
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Affiliation(s)
- Graham S. Collier
- Departments of †Chemistry and ‡Chemical and Biomolecular
Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Lauren A. Brown
- Departments of †Chemistry and ‡Chemical and Biomolecular
Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Evan S. Boone
- Departments of †Chemistry and ‡Chemical and Biomolecular
Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Brian K. Long
- Departments of †Chemistry and ‡Chemical and Biomolecular
Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - S. Michael Kilbey
- Departments of †Chemistry and ‡Chemical and Biomolecular
Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
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58
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Samanta A, Medintz IL. Nanoparticles and DNA - a powerful and growing functional combination in bionanotechnology. NANOSCALE 2016; 8:9037-95. [PMID: 27080924 DOI: 10.1039/c5nr08465b] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Functionally integrating DNA and other nucleic acids with nanoparticles in all their different physicochemical forms has produced a rich variety of composite nanomaterials which, in many cases, display unique or augmented properties due to the synergistic activity of both components. These capabilities, in turn, are attracting greater attention from various research communities in search of new nanoscale tools for diverse applications that include (bio)sensing, labeling, targeted imaging, cellular delivery, diagnostics, therapeutics, theranostics, bioelectronics, and biocomputing to name just a few amongst many others. Here, we review this vibrant and growing research area from the perspective of the materials themselves and their unique capabilities. Inorganic nanocrystals such as quantum dots or those made from gold or other (noble) metals along with metal oxides and carbon allotropes are desired as participants in these hybrid materials since they can provide distinctive optical, physical, magnetic, and electrochemical properties. Beyond this, synthetic polymer-based and proteinaceous or viral nanoparticulate materials are also useful in the same role since they can provide a predefined and biocompatible cargo-carrying and targeting capability. The DNA component typically provides sequence-based addressability for probes along with, more recently, unique architectural properties that directly originate from the burgeoning structural DNA field. Additionally, DNA aptamers can also provide specific recognition capabilities against many diverse non-nucleic acid targets across a range of size scales from ions to full protein and cells. In addition to appending DNA to inorganic or polymeric nanoparticles, purely DNA-based nanoparticles have recently surfaced as an excellent assembly platform and have started finding application in areas like sensing, imaging and immunotherapy. We focus on selected and representative nanoparticle-DNA materials and highlight their myriad applications using examples from the literature. Overall, it is clear that this unique functional combination of nanomaterials has far more to offer than what we have seen to date and as new capabilities for each of these materials are developed, so, too, will new applications emerge.
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Affiliation(s)
- Anirban Samanta
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, USA. and College of Science, George Mason University, Fairfax, Virginia 22030, USA
| | - Igor L Medintz
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, USA.
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59
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Yang Y, Wang X, Cui Q, Cao Q, Li L. Self-Assembly of Fluorescent Organic Nanoparticles for Iron(III) Sensing and Cellular Imaging. ACS APPLIED MATERIALS & INTERFACES 2016; 8:7440-8. [PMID: 26950776 DOI: 10.1021/acsami.6b00065] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Fluorescent organic nanoparticles have attracted increasing attentions for chemical or biological sensing and imaging due to their low-toxicity, facile fabrication and surface functionalization. In this work, we report novel fluorescent organic nanoparticles via facile self-assembly method in aqueous solution. First, the designed water-soluble fluorophore shows a weak and negligible intrinsic fluorescence in water. Upon binding with adenosine-5'-triphosphate (ATP), fluorescent nanoparticles were formed immediately with strongly enhanced fluorescence. These fluorescent nanoparticles exhibit high sensitivity and selectivity toward Fe(3+) sensing with detection limit of 0.1 nM. In addition, after incubation with HeLa cells, the fluorophore shows excellent imaging performance by interaction with entogenous ATP in cells. Finally, this fluorescent system is also demonstrated to be capable of Fe(3+) sensing via fluorescence quenching in cellular environment.
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Affiliation(s)
- Yu Yang
- School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China
| | - Xiaoyu Wang
- School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China
| | - Qianling Cui
- School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China
| | - Qian Cao
- School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China
| | - Lidong Li
- School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China
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60
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Protein-gold clusters-capped mesoporous silica nanoparticles for high drug loading, autonomous gemcitabine/doxorubicin co-delivery, and in-vivo tumor imaging. J Control Release 2016; 229:183-191. [PMID: 27016140 DOI: 10.1016/j.jconrel.2016.03.030] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 03/17/2016] [Accepted: 03/18/2016] [Indexed: 01/01/2023]
Abstract
Functional nanocarriers capable of transporting high drug contents without premature leakage and to controllably deliver several drugs are needed for better cancer treatments. To address this clinical need, gold cluster bovine serum albumin (AuNC@BSA) nanogates were engineered on mesoporous silica nanoparticles (MSN) for high drug loadings and co-delivery of two different anticancer drugs. The first drug, gemcitabine (GEM, 40wt%), was loaded in positively-charged ammonium-functionalized MSN (MSN-NH3(+)). The second drug, doxorubicin (DOX, 32wt%), was bound with negatively-charged AuNC@BSA electrostatically-attached onto MSN-NH3(+), affording highly loaded pH-responsive MSN-AuNC@BSA nanocarriers. The co-delivery of DOX and GEM was achieved for the first time via an inorganic nanocarrier, possessing a zero-premature leakage behavior as well as drug loading capacities seven times higher than polymersome NPs. Besides, unlike the majority of strategies used to cap the pores of MSN, AuNC@BSA nanogates are biotools and were applied for targeted red nuclear staining and in-vivo tumor imaging. The straightforward non-covalent combination of MSN and gold-protein cluster bioconjugates thus leads to a simple, yet multifunctional nanotheranostic for the next generation of cancer treatments.
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61
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Huang C, Liu Y, Wu L, Zhao H. Synthesis of chiral fluorescence silver nano-clusters and study on the aggregation-induced emission enhancement and chiral flip. RSC Adv 2016. [DOI: 10.1039/c6ra22102e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Using racemic GSH as ligand, AgNCs with aggregation-induced emission enhancement and chiral flip were synthesized with solid-phase synthesis method.
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Affiliation(s)
- Cheng Huang
- Department of Chemistry
- College of Pharmacy
- Third Military Medical University
- Chongqing 400038
- China
| | - Yue Liu
- Department of Chemistry
- College of Pharmacy
- Third Military Medical University
- Chongqing 400038
- China
| | - Liping Wu
- Department of Chemistry
- College of Pharmacy
- Third Military Medical University
- Chongqing 400038
- China
| | - Huawen Zhao
- Department of Chemistry
- College of Pharmacy
- Third Military Medical University
- Chongqing 400038
- China
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62
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Pan L, Sun S, Zhang L, Jiang K, Lin H. Near-infrared emissive carbon dots for two-photon fluorescence bioimaging. NANOSCALE 2016; 8:17350-17356. [PMID: 27714173 DOI: 10.1039/c6nr05878g] [Citation(s) in RCA: 150] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
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63
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Chattoraj S, Amin A, Jana B, Mohapatra S, Ghosh S, Bhattacharyya K. Selective Killing of Breast Cancer Cells by Doxorubicin-Loaded Fluorescent Gold Nanoclusters: Confocal Microscopy and FRET. Chemphyschem 2015; 17:253-9. [PMID: 26615975 DOI: 10.1002/cphc.201500982] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 11/26/2015] [Indexed: 12/22/2022]
Abstract
Fluorescent gold nanoclusters (AuNCs) capped with lysozymes are used to deliver the anticancer drug doxorubicin to cancer and noncancer cells. Doxorubicin-loaded AuNCs cause the highly selective and efficient killing (90 %) of breast cancer cells (MCF7) (IC50 =155 nm). In contrast, the killing of the noncancer breast cells (MCF10A) by doxorubicin-loaded AuNCs is only 40 % (IC50 =4500 nm). By using a confocal microscope, the fluorescence spectrum and decay of the AuNCs were recorded inside the cell. The fluorescence maxima (at ≈490-515 nm) and lifetime (≈2 ns), of the AuNCs inside the cells correspond to Au10-13 . The intracellular release of doxorubicin from AuNCs is monitored by Förster resonance energy transfer (FRET) imaging.
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Affiliation(s)
- Shyamtanu Chattoraj
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India), Fax
| | - Asif Amin
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India), Fax
| | - Batakrishna Jana
- Organic & Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, 700 032, India
| | - Saswat Mohapatra
- Organic & Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, 700 032, India
| | - Surajit Ghosh
- Organic & Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, 700 032, India.
| | - Kankan Bhattacharyya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India), Fax.
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64
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Synthesis of ultrastable and multifunctional gold nanoclusters with enhanced fluorescence and potential anticancer drug delivery application. J Colloid Interface Sci 2015; 455:6-15. [DOI: 10.1016/j.jcis.2015.05.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 05/17/2015] [Accepted: 05/18/2015] [Indexed: 11/22/2022]
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65
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Malek SMA, Morrow GP, Saika-Voivod I. Crystallization of Lennard-Jones nanodroplets: From near melting to deeply supercooled. J Chem Phys 2015; 142:124506. [PMID: 25833595 DOI: 10.1063/1.4915917] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
We carry out molecular dynamics (MD) and Monte Carlo (MC) simulations to characterize nucleation in liquid clusters of 600 Lennard-Jones particles over a broad range of temperatures. We use the formalism of mean first-passage times to determine the rate and find that Classical Nucleation Theory (CNT) predicts the rate quite well, even when employing simple modelling of crystallite shape, chemical potential, surface tension, and particle attachment rate, down to the temperature where the droplet loses metastability and crystallization proceeds through growth-limited nucleation in an unequilibrated liquid. Below this crossover temperature, the nucleation rate is still predicted when MC simulations are used to directly calculate quantities required by CNT. Discrepancy in critical embryo sizes obtained from MD and MC arises when twinned structures with five-fold symmetry provide a competing free energy pathway out of the critical region. We find that crystallization begins with hcp-fcc stacked precritical nuclei and differentiation to various end structures occurs when these embryos become critical. We confirm that using the largest embryo in the system as a reaction coordinate is useful in determining the onset of growth-limited nucleation and show that it gives the same free energy barriers as the full cluster size distribution once the proper reference state is identified. We find that the bulk melting temperature controls the rate, even though the solid-liquid coexistence temperature for the droplet is significantly lower. The value of surface tension that renders close agreement between CNT and direct rate determination is significantly lower than what is expected for the bulk system.
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Affiliation(s)
- Shahrazad M A Malek
- Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador A1B 3X7, Canada
| | - Gregory P Morrow
- Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador A1B 3X7, Canada
| | - Ivan Saika-Voivod
- Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador A1B 3X7, Canada
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66
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Ghosh S, Das NK, Anand U, Mukherjee S. Photostable Copper Nanoclusters: Compatible Förster Resonance Energy-Transfer Assays and a Nanothermometer. J Phys Chem Lett 2015; 6:1293-8. [PMID: 26262990 DOI: 10.1021/acs.jpclett.5b00378] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
To address the concern of material chemists over the issue of stability and photoluminescent (PL) characteristics of Cu nanoclusters (NCs), herein we present an efficient protocol discussing PL Cu NCs (Cu/HSA) having blue emission and high photostability. These PL NCs were illustrated as efficient probes for Förster resonance energy transfer (FRET) with a compatible fluorophore (Coumarin 153). Our spectroscopic results were well complemented by our molecular docking calculations, which also favored our proposed mechanism for Cu NC formation. The beneficial aspect and uniqueness of these nontoxic Cu/HSA NCs highlights their temperature-dependent PL reversibility as well as the reversible FRET with Coumarin 153, which enables them to be used as a nanothermometer and a PL marker for sensitive biological samples.
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Affiliation(s)
- Subhadip Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Nirmal Kumar Das
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Uttam Anand
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Saptarshi Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
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67
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Zhang E, Fu A. A new strategy for specific imaging of neural cells based on peptide-conjugated gold nanoclusters. Int J Nanomedicine 2015; 10:2115-24. [PMID: 25834429 PMCID: PMC4370942 DOI: 10.2147/ijn.s78554] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Despite the significant progress in molecular imaging technologies that has been made in recent years, the specific detection of neural cells still remains challenging. Here, we suggest the use of gold nanoclusters (AuNCs) modified with a brain-targeting peptide as a potential imaging candidate for detecting neural cells in vitro and in mice. AuNCs of less than 10 nm (dynamic light scattering analysis) were first prepared using the "green" synthetic approach, and then a targeting peptide, rabies virus glycoprotein derived peptide (RDP), was conjugated to the AuNCs for improving the efficiency and specificity of neural cell penetration. The conjugate's mechanism of cellular attachment and entry into neural cells was suggested to be receptor-mediated endocytosis through clathrin-coated pits. Also, noninvasive imaging analysis and animal studies indicated that the RDP-modified nanoclusters could concentrate in the brain and locate in neural cells. This study suggests the feasibility of using targeting peptide-modified nanoclusters for noninvasive imaging brain cells in vivo.
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Affiliation(s)
- Enqi Zhang
- School of Pharmaceutical Sciences, Southwest University, Chongqing, People’s Republic of China
| | - Ailing Fu
- School of Pharmaceutical Sciences, Southwest University, Chongqing, People’s Republic of China
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68
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Yin HQ, Bi FL, Gan F. Rapid synthesis of cyclic RGD conjugated gold nanoclusters for targeting and fluorescence imaging of melanoma A375 cells. Bioconjug Chem 2015; 26:243-9. [PMID: 25629561 DOI: 10.1021/bc500505c] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A simple, rapid, and inexpensive method for the synthesis of cyclic arginine-glycine-aspartic acid (RGD) peptide conjugated gold nanoclusters (RGD-GNCs) was reported. The nanoclusters were synthesized with chloraurate as precursor and cyclic RGD peptides as both reducing and protecting agent directly under alkali condition, and the whole synthetic process only took 15 min at room temperature. The properties of the nanoclusters were characterized by means of ultraviolet-visible spectra, Fourier transform infrared spectroscopy (FTIR), fluorescence, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The prepared gold nanoclusters were successfully used as a contrast agent in fluorescence imaging of the melanoma A375 cells, which overexpress the integrin αvβ3. The results demonstrated that our nanoclusters possess good biocompatibility, stability, and low toxicity. Moreover, the method is expected to be applicable to the synthesis of nanoclusters conjugated with other biomolecules.
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Affiliation(s)
- Hua-Qin Yin
- School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, P.R. China
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69
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Ko DY, Moon HJ, Jeong B. Temperature-sensitive polypeptide nanogels for intracellular delivery of a biomacromolecular drug. J Mater Chem B 2015; 3:3525-3530. [DOI: 10.1039/c5tb00366k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Temperature sensitive polypeptide nanogels showing excellent cytocompatibility and internalization efficiency controlled by the zeta potential and size of the nanogels.
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Affiliation(s)
- Du Young Ko
- Department of Chemistry and Nano Science
- Ewha Womans University
- Seoul
- Korea
| | - Hyo Jung Moon
- Department of Chemistry and Nano Science
- Ewha Womans University
- Seoul
- Korea
| | - Byeongmoon Jeong
- Department of Chemistry and Nano Science
- Ewha Womans University
- Seoul
- Korea
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70
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Huang P, Li S, Gao N, Wu F. Toward selective, sensitive, and discriminative detection of Hg2+ and Cd2+via pH-modulated surface chemistry of glutathione-capped gold nanoclusters. Analyst 2015; 140:7313-21. [DOI: 10.1039/c5an01356a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Heavy metal pollution can exert severe effects on the environment and human health.
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Affiliation(s)
| | - Sha Li
- College of Chemistry
- Nanchang University
- Nanchang 330031
- China
| | - Nan Gao
- College of Chemistry
- Nanchang University
- Nanchang 330031
- China
| | - Fangying Wu
- College of Chemistry
- Nanchang University
- Nanchang 330031
- China
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71
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Pandya A, Tripathi A, Purohit R, Singh S, Nandasiri MI, Karakoti A, Singh SP, Shanker R. Fluorescent magnesium nanocomplex in a protein scaffold for cell nuclei imaging applications. RSC Adv 2015. [DOI: 10.1039/c5ra18450a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
For the first time, we report a facile strategy for the synthesis of ultra-fine blue-green emitting fluorescent magnesium nanoparticles–protein complex (MgNC) which shows excellent photo stability and also stain cell nuclei with high specificity.
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Affiliation(s)
- Alok Pandya
- Institute of Life Sciences
- School of Science and Technology
- Ahmedabad University
- Ahmedabad-380009
- India
| | - Apritam Tripathi
- Institute of Life Sciences
- School of Science and Technology
- Ahmedabad University
- Ahmedabad-380009
- India
| | - Rahul Purohit
- Institute of Life Sciences
- School of Science and Technology
- Ahmedabad University
- Ahmedabad-380009
- India
| | - Sanjay Singh
- Institute of Life Sciences
- School of Science and Technology
- Ahmedabad University
- Ahmedabad-380009
- India
| | | | - Ajay Karakoti
- Institute of Life Sciences
- School of Science and Technology
- Ahmedabad University
- Ahmedabad-380009
- India
| | | | - Rishi Shanker
- Institute of Life Sciences
- School of Science and Technology
- Ahmedabad University
- Ahmedabad-380009
- India
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72
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Zhang X, Wu FG, Liu P, Gu N, Chen Z. Enhanced fluorescence of gold nanoclusters composed of HAuCl4 and histidine by glutathione: glutathione detection and selective cancer cell imaging. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:5170-7. [PMID: 25111498 DOI: 10.1002/smll.201401658] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2014] [Revised: 07/14/2014] [Indexed: 05/21/2023]
Abstract
Glutathione (GSH) can significantly and selectively enhance the fluorescence intensity of Au nanoclusters (NCs) prepared by blending HAuCl4 and histidine in solution. The quantum yield of the Au NCs after adding GSH can reach above 10%. Besides, GSH capping shifts the excitation peak of Au NCs from ultraviolet (386 nm) to visible light (414 nm) and improves the stability of the Au NCs. The cytotoxicities of the Au NCs with and without GSH for normal lung cells (ATII) and cancerous lung cells (A549) are evaluated. The GSH-capped Au NCs have much less cytotoxicity to both normal and cancer cells, as compared to those without GSH. For Au NCs without GSH, less cytotoxicity is observed in cancer cells than in normal cells. In addtion, the Au NCs can selectively detect GSH over cysteine and homocysteine, the two biothiols which commonly exist in cells that can seriously affect GSH detection. Most importantly, Au NCs without GSH can selectively image the cancer cells, especially for the liver cancer cells whose GSH content is much higher than other cell types. This property makes the Au NCs a powerful probe to distinguish cancer cells from normal cells.
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Affiliation(s)
- Xiaodong Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
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73
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He X, Ma N. An overview of recent advances in quantum dots for biomedical applications. Colloids Surf B Biointerfaces 2014; 124:118-31. [DOI: 10.1016/j.colsurfb.2014.06.002] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 05/23/2014] [Accepted: 06/01/2014] [Indexed: 12/23/2022]
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74
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Chemical etching of bovine serum albumin-protected Au25 nanoclusters for label-free and separation-free detection of cysteamine. Biosens Bioelectron 2014; 66:155-61. [PMID: 25460897 DOI: 10.1016/j.bios.2014.10.073] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 10/18/2014] [Accepted: 10/31/2014] [Indexed: 11/23/2022]
Abstract
This study describes a novel Au nanocluster-based fluorescent sensor for label-free, separation-free and selective detection of cysteamine (CSH). The sensing mechanism is based on CSH etching-induced fluorescence quenching of the bovine serum albumin-protected Au25 nanoclusters (BSAGNCs). A series of characterizations is carried out towards a better understanding of the CSH-induced fluorescence quenching of the BSAGNCs. It is found that CSH can etch the Au25 nanoclusters, exhibiting the potent etching activity. Other thiol-containing compounds such as glutathione and cysteine and other 19 natural amino acids do not interfere with such CSH-induced etching process. The decreases in fluorescence intensity of the BSAGNCs allow sensitive detection of free CSH in the range of 500-10,000nM. The detection limit for CSH is 150nM (S/N=3). The spiked human serum samples can be analyzed with satisfactory results.
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75
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Chen LY, Wang CW, Yuan Z, Chang HT. Fluorescent Gold Nanoclusters: Recent Advances in Sensing and Imaging. Anal Chem 2014; 87:216-29. [DOI: 10.1021/ac503636j] [Citation(s) in RCA: 547] [Impact Index Per Article: 54.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Li-Yi Chen
- Department
of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei 106, Taiwan
| | - Chia-Wei Wang
- Department
of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei 106, Taiwan
| | - Zhiqin Yuan
- Department
of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei 106, Taiwan
| | - Huan-Tsung Chang
- Department
of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei 106, Taiwan
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76
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Venkatesh V, Pachfule P, Banerjee R, Verma S. Evolution of an Adenine-Copper Cluster to a Highly Porous Cuboidal Framework: Solution-Phase Ripening and Gas-Adsorption Properties. Chemistry 2014; 20:12262-8. [DOI: 10.1002/chem.201403115] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Indexed: 11/08/2022]
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77
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Thomas A, Shukla A, Sivakumar S, Verma S. Assembly, postsynthetic modification and hepatocyte targeting by multiantennary, galactosylated soft structures. Chem Commun (Camb) 2014; 50:15752-5. [DOI: 10.1039/c4cc07074g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Enzyme modifiable, hollow self-assembled structures offer an excellent scope for multiantennary delivery vectors.
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Affiliation(s)
- Anisha Thomas
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur-208016, India
| | - Akansha Shukla
- Department of Chemical Engineering, Material Science Programme, Indian Institute of Technology Kanpur
- Kanpur-208016, India
| | - Sri Sivakumar
- Department of Chemical Engineering, Material Science Programme, Indian Institute of Technology Kanpur
- Kanpur-208016, India
- DST Thematic Unit of Excellence on Soft Nanofabrication, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur
- Kanpur-208016, India
| | - Sandeep Verma
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur-208016, India
- DST Thematic Unit of Excellence on Soft Nanofabrication, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur
- Kanpur-208016, India
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