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Wang X, Zhang X, Cao H, Huang Y. An inorganic base stripping approach to synthesize N-doped Ti3C2 quantum dots as fluorescence nanoprobe for the simultaneous detection of Co2+ and Ag+ ions. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Detection of silver through amplified quenching of fluorescence from polyvinyl pyrrolidone-stabilized copper nanoclusters. Mikrochim Acta 2021; 188:212. [PMID: 34052959 DOI: 10.1007/s00604-021-04873-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 05/20/2021] [Indexed: 10/21/2022]
Abstract
Silver ion detection with ultra-high sensitivity was established. We synthesized copper nanoclusters (CuNCs) with blue fluorescence through a one-pot process. Instead of a direct quencher toward the CuNCs, silver ions activated the strong oxidation from persulfate and subsequently converted divalent manganese ion into manganese dioxide (MnO2). The surface charges of MnO2 and the CuNCs brought them together and quenched the fluorescence from the latter. Due to silver ions' role as the catalyst in the process, it cycled and even a small amount leads to a significant fluorescence change. This signaling provided the determination of silver ions in the range 5 pM~1 nM, with a detection limit of 1.2 pM. The method is selective, and its applicability was validated through practical water sample analyses.
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Ragonese F, Monarca L, Bastioli F, Arcuri C, Mancinelli L, Fioretti B. Silver ions promote blebs growth in U251 glioblastoma cell by activating nonselective cationic currents. Sci Rep 2019; 9:12898. [PMID: 31501459 PMCID: PMC6733836 DOI: 10.1038/s41598-019-49198-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 08/21/2019] [Indexed: 11/09/2022] Open
Abstract
Glioblastoma (GBM) is the most common and aggressive human brain cancer with low prognosis and therefore the discovery of new anticancer agents is needful. Sulfydryl reagents, such as silver, have been shown to induce membrane vesiculation in several cellular models through a mechanism that has not been yet completely clarified. Using U251 glioblastoma cells, we observed that silver induced irreversible bleb formation of the plasma membrane. This morphological event was anticipated by an increase of intracellular Ca2+ associated to extracellular Ca2+ influx. Accordingly, using patch-clamp whole cell recording during silver ion application, inward current/s (IAg) at -90 mV were detected and cells were permeable to Ca2+ and monovalent ions such as Na+. IAg activation and the intracellular Ca2+ increase promoted by silver ions (Ag+) were prevented by co-application of 20 µM cysteine and 300 µM DIDS (4,4'-Diisothiocyanatostilbene-2,2'-disulfonic acid), suggesting a critical role of thiol groups in the biological effects of silver ions. IAg was partially inhibited by 1 mM Gd3+, an unspecific inhibitor of cationic currents. Cysteine, Gd3+ and extracellular free Ca2+ solution completely abolished blebbing formation promoted by Ag+. Furthermore, extracellular Na+ ion replacement with TEA or an increase of extracellular tonicity by sucrose (100 mM) reduced both size and growth of membrane blebbing. Our data suggest that Ag+ promotes the formation necrotic blebs as consequence of the increase of intracellular Ca2+ and intracellular hydrostatic pressure associated to the activation of cationic currents. Since silver-induced blebs were less evident in benign glial human Müller MIO-M1 cells, silver compounds could represent new adjuvant to anticancer agents to improve GBM therapies.
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Affiliation(s)
- Francesco Ragonese
- Department of Chemistry, Biology and Biotechnologies, Via Elce di Sotto 8, University of Perugia, Perugia, Italy.,Department of Experimental Medicine, Piazzale Gambuli 1, University of Perugia, Perugia, Italy
| | - Lorenzo Monarca
- Department of Chemistry, Biology and Biotechnologies, Via Elce di Sotto 8, University of Perugia, Perugia, Italy
| | - Federica Bastioli
- Department of Chemistry, Biology and Biotechnologies, Via Elce di Sotto 8, University of Perugia, Perugia, Italy
| | - Cataldo Arcuri
- Department of Experimental Medicine, Piazzale Gambuli 1, University of Perugia, Perugia, Italy
| | - Loretta Mancinelli
- Department of Chemistry, Biology and Biotechnologies, Via Elce di Sotto 8, University of Perugia, Perugia, Italy
| | - Bernard Fioretti
- Department of Chemistry, Biology and Biotechnologies, Via Elce di Sotto 8, University of Perugia, Perugia, Italy.
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Santos KL, Vento MA, Wright JW, Speth RC. The effects of para-chloromercuribenzoic acid and different oxidative and sulfhydryl agents on a novel, non-AT1, non-AT2 angiotensin binding site identified as neurolysin. ACTA ACUST UNITED AC 2013; 184:104-14. [PMID: 23511333 DOI: 10.1016/j.regpep.2013.03.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 12/21/2012] [Accepted: 03/03/2013] [Indexed: 11/28/2022]
Abstract
A novel, non-AT1, non-AT2 brain binding site for angiotensin peptides that is unmasked by p-chloromercuribenzoate (PCMB) has been identified as a membrane associated variant of neurolysin. The ability of different organic and inorganic oxidative and sulfhydryl reactive agents to unmask or inhibit 125I-Sar1Ile8 angiotensin II (SI-Ang II) binding to this site was presently examined. In tissue membranes from homogenates of rat brain and testis incubated in assay buffer containing losartan (10 μM) and PD123319 (10 μM) plus 100 μM PCMB, 5 of the 39 compounds tested inhibited 125I-SI Ang II binding in brain and testis. Mersalyl acid, mercuric chloride (HgCl2) and silver nitrate (AgNO3) most potently inhibited 125I-SI Ang II binding with IC50s ~1-20 μM. This HgCl2 inhibition was independent of any interaction of HgCl2 with angiotensin II (Ang II) based on the lack of effect of HgCl2 on the dipsogenic effects of intracerebroventricularly administered Ang II and 125I-SI Ang II binding to AT1 receptors in the liver. Among sulfhydryl reagents, cysteamine and reduced glutathione (GSH), but not oxidized glutathione (GSSG) up to 1mM, inhibited PCMB-unmasked 125I-SI Ang II binding in brain and testis. Thimerosal and 4-hydroxymercuribenzoate moderately inhibited PCMB-unmasked 125I-SI Ang II binding in brain and testis at 100 μM; however, they also unmasked non-AT1, non-AT2 binding independent of PCMB. 4-Hydroxybenzoic acid did not promote 125 I-SI Ang II binding to this binding site indicating that only specific organomercurial compounds can unmask the binding site. The common denominator for all of these interacting substances is the ability to bind to protein cysteine sulfur. Comparison of cysteines between neurolysin and the closely related enzyme thimet oligopeptidase revealed an unconserved cysteine (cys650, based on the full length variant) in the proposed ligand binding channel (Brown et al., 2001) [45] near the active site of neurolysin. It is proposed that the mercuric ion in PCMB and closely related organomercurial compounds binds to cys650, while the acidic anion forms an ionic bond with a nearby arginine or lysine along the channel to effect a conformational change in neurolysin that promotes Ang II binding.
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Affiliation(s)
- Kira L Santos
- Pharmaceutical Sciences Department, College of Pharmacy, Nova Southeastern University, Fort Lauderdale, FL 33328, United States
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Kim JM, Lohani CR, Neupane LN, Choi Y, Lee KH. Highly sensitive turn-on detection of Ag+ in aqueous solution and live cells with a symmetric fluorescent peptide. Chem Commun (Camb) 2012; 48:3012-4. [DOI: 10.1039/c2cc16953c] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Neupane LN, Thirupathi P, Jang S, Jang MJ, Kim JH, Lee KH. Highly selectively monitoring heavy and transition metal ions by a fluorescent sensor based on dipeptide. Talanta 2011; 85:1566-74. [DOI: 10.1016/j.talanta.2011.06.052] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 06/17/2011] [Accepted: 06/17/2011] [Indexed: 11/28/2022]
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Laban G, Nies LF, Turco RF, Bickham JW, Sepúlveda MS. The effects of silver nanoparticles on fathead minnow (Pimephales promelas) embryos. ECOTOXICOLOGY (LONDON, ENGLAND) 2010; 19:185-195. [PMID: 19728085 DOI: 10.1007/s10646-009-0404-4] [Citation(s) in RCA: 148] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/13/2009] [Indexed: 05/27/2023]
Abstract
Nanoparticles are being used in many commercial applications. We describe the toxicity of two commercial silver (Ag) nanoparticle (NP) products, NanoAmor and Sigma on Pimephales promelas embryos. Embryos were exposed to varying concentrations of either sonicated or stirred NP solutions for 96 h. LC(50) values for NanoAmor and Sigma Ag NPs were 9.4 and 10.6 mg/L for stirred and 1.25 and 1.36 mg/L for sonicated NPs, respectively. Uptake of Ag NPs into the embryos was observed after 24 h using Transmission Electron Microscopy and Ag NPs induced a concentration-dependent increase in larval abnormalities, mostly edema. Dissolved Ag released from Ag NPs was measured using Inductively Coupled-Mass Spectrometry and the effects tested were found to be three times less toxic when compared to Ag nitrate (AgNO(3)). The percentage of dissolved Ag released was inversely proportional to the concentration of Ag NPs with the lowest (0.625 mg/L) and highest (20 mg/L) concentrations tested releasing 3.7 and 0.45% dissolved Ag, respectively and percent release was similar regardless if concentrations were stirred or sonicated. Thus increased toxicity after sonication cannot be solely explained by dissolved Ag. We conclude that both dissolved and particulate forms of Ag elicited toxicity to fish embryos.
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Affiliation(s)
- Geoff Laban
- Department of Forestry & Natural Resources, Purdue University, 195 Marsteller St., West Lafayette, IN 47907, USA
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