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Abstract
Antibiotic resistance has caused a serious threat to public health and human safety. Recently, the emergence of novel resistance gene tet(X4) and its variants threatens the clinical utility of tigecycline, one of the last-line antibiotics for multidrug-resistant (MDR) bacterial infections. It is highly promising to develop effective antibiotic adjuvants to restore the clinical efficacy of existing drugs and extend their life spans. Metal compounds, such as silver, have been widely used as potential antimicrobial agents for decades. However, the potentiating effect of metallo-agents on the existing antibiotics is not fully understood. Here, we found that five bismuth drugs, especially bismuth nitrate [Bi(NO3)3], commonly used in clinical treatment of stomach-associated diseases, effectively boost the antibacterial activity of tigecycline against tet(X)-positive bacteria by inhibiting the enzymatic activity of Tet(X) protein. Furthermore, the combination of Bi(NO3)3 and tigecycline prevents the development of higher-level resistance in Tet(X)-expressing Gram-negative bacteria. Using molecular docking and dynamics simulation assays, we revealed that Bi(NO3)3 can competitively bind to the active center of Tet(X4) protein, while the bismuth atom targets the Tet(X4) protein in a noncompetitive manner and changes the structure of the primary binding pocket. These two mechanisms of action both antagonize the enzymatic activity of Tet(X4) resistance protein on tigecycline. Collectively, these findings indicate the high potential of bismuth drugs as novel Tet(X) inhibitors to treat tet(X4)-positive bacteria-associated infections in combination with tigecycline. IMPORTANCE Recently, high-level tigecycline resistance mediated by tet(X4) and its variants represents a serious challenge for global public health. Antibiotic adjuvant strategy that enhances the activity of the existing antibiotics by using nonantibiotic drugs offers a distinct approach to combat the antibiotic resistance crisis. In this study, we found that bismuth drugs involve bismuth nitrate, a compound previously approved for treatment of stomach-associated diseases, remarkably potentiates tigecycline activity against tet(X)-positive bacteria. Mechanistic studies showed that bismuth drugs effectively suppress the enzymatic activity of Tet(X) resistance protein. Specifically, bismuth nitrate targets the active center of Tet(X4) protein, while bismuth binds to the resistance protein in a noncompetitive manner. Our data open up a new horizon for the treatment of infections caused by tet(X)-bearing superbugs.
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Griffith DM, Li H, Werrett MV, Andrews PC, Sun H. Medicinal chemistry and biomedical applications of bismuth-based compounds and nanoparticles. Chem Soc Rev 2021; 50:12037-12069. [PMID: 34533144 DOI: 10.1039/d0cs00031k] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Bismuth as a relatively non-toxic and inexpensive metal with exceptional properties has numerous biomedical applications. Bismuth-based compounds are used extensively as medicines for the treatment of gastrointestinal disorders including dyspepsia, gastric ulcers and H. pylori infections. Recently, its medicinal application was further extended to potential treatments of viral infection, multidrug resistant microbial infections, cancer and also imaging, drug delivery and biosensing. In this review we have highlighted the unique chemistry and biological chemistry of bismuth-209 as a prelude to sections covering the unique antibacterial activity of bismuth including a description of research undertaken to date to elucidate key molecular mechanisms of action against H. pylori, the development of novel compounds to treat infection from microbes beyond H. pylori and the significant role bismuth compounds can play as resistance breakers. Furthermore we have provided an account of the potential therapeutic application of bismuth-213 in targeted alpha therapy as well as a summary of the biomedical applications of bismuth-based nanoparticles and composites. Ultimately this review aims to provide the state of the art, highlight the untapped biomedical potential of bismuth and encourage original contributions to this exciting and important field.
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Affiliation(s)
- Darren M Griffith
- Department of Chemistry, Royal College of Surgeons in Ireland, 123 St. Stephens Green, Dublin 2, Ireland.,SSPC, Synthesis and Solid State Pharmaceutical Centre, Ireland
| | - Hongyan Li
- Department of Chemistry and CAS-HKU Joint Laboratory of Metallomics for Health and Environment, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
| | | | - Philip C Andrews
- School of Chemistry, Monash University, Melbourne, VIC, Australia
| | - Hongzhe Sun
- Department of Chemistry and CAS-HKU Joint Laboratory of Metallomics for Health and Environment, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
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Abstract
OBJECTIVE To determine the effects of bovine lactoferrin (bLF) on cell viability, proliferation, and the protective roles in intestinal epithelial cells-6 (IEC-6) treated by lipopolysaccharide (LPS). METHODS Cell viability and proliferation of IEC-6 were detected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and Brdu assay separately. Cell cycle distribution was analyzed by flow cytometry. Inflammatory cytokines were analysed by real-time PCR and ELISA. Western blot was utilized to measure the level of MAPK and NF-κβ nuclear translocation. RESULTS Dose-dependent effects of bLF on cell viability and proliferation were observed in IEC-6 cells (both P < 0.05), especially at a dose of 100 μg/ml. The percentage of cells in the G2 and S phase was significantly higher than those of the control group (8.17 ± 0.49% vs 4.72 ± 0.55%, P < 0.01 and 12.75 ± 0.33% vs 9.48 ± 0.33%, P < 0.01, respectively). The mRNA level of IL-1β, IL-6 and TNF-α was decreased by co-stimulation of bLF and LPS compared with the LPS treatments alone in IEC-6 cells (all P < 0.001). The secretion of IL-6 and TNF-α were also decreased by co-stimulation of bLF and LPS (both P < 0.01). Bovine lactoferrin treatment at dose of 100 μg/ml could inhibit the activation of MAPK/NF-κβ signal pathway induced by LPS (both P < 0.001). CONCLUSIONS Bovine lactoferrin could promote the cell viability and proliferation, and have anti-inflammatory effects via inhibition of the activation of MAPK and NF-κβ nuclear translocation. Supplementation of formula with bLF may be beneficial in preventing NEC in preterm infants.
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He L, Li WJ, An CX, Shi H, Lin ZF. Two new Bi(III) and Ce(III)-containing coordination complexes: Crystal structure and anticancer activity in neuroblastoma. MAIN GROUP CHEMISTRY 2020. [DOI: 10.3233/mgc-190817] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Liu He
- Department of Pediatrics, Jinniu Maternity and Child Health Hospital of Chengdu, Chengdu, Sichuan, China
| | - Wen-Jun Li
- Department of Gynaecology and Obstetrics, Chengdu Tumor Hospital, Chengdu, Sichuan, China
| | - Cai-Xia An
- Department of Pediatrics, Jinniu Maternity and Child Health Hospital of Chengdu, Chengdu, Sichuan, China
| | - Hao Shi
- Department of Pediatrics, Jinniu Maternity and Child Health Hospital of Chengdu, Chengdu, Sichuan, China
| | - Zhen-Fang Lin
- Department of Neurology, Affiliated Sichuan Provincial Rehabilitation Hospital of Chengdu University of TCM, Chengdu, Sichuan, China
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A FRET based colorimetric and fluorescence probe for selective detection of Bi3+ ion and live cell imaging. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.04.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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6
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Dissection of the interaction between human holo-transferrin and ciprofloxacin in the presence of silver nanoparticles: spectroscopic approaches. Biologia (Bratisl) 2017. [DOI: 10.1515/biolog-2017-0066] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Güette-Fernández JR, Meléndez E, Maldonado-Rojas W, Ortega-Zúñiga C, Olivero-Verbel J, Parés-Matos EI. A molecular docking study of the interactions between human transferrin and seven metallocene dichlorides. J Mol Graph Model 2017; 75:250-265. [PMID: 28609757 DOI: 10.1016/j.jmgm.2017.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Revised: 05/08/2017] [Accepted: 05/09/2017] [Indexed: 02/08/2023]
Abstract
Human Transferrin (hTf) is a metal-binding protein found in blood plasma and is well known for its role in iron delivery. With only a 30% of its capacity for Fe+3 binding, this protein has the potential ability to transport other metal ions or organometallic compounds from the blood stream to all cell tissues. In this perspective, recent studies have described seven metallocene dichlorides (Cp2M(IV)Cl2, M(IV)=V, Mo, W, Nb, Ti, Zr, Hf) suitable as anticancer drugs and less secondary effects than cisplatin. However, these studies have not provided enough data to clearly explain how hTf binds and transports these organometallic compounds into the cells. Thus, a computational docking study with native apo-hTf using Sybyl-X 2.0 program was conducted to explore the binding modes of these seven Cp2M(IV)Cl2 after their optimization and minimization using Gaussian 09. Our model showed that the first three Cp2M(IV)Cl2 (M(IV)=V, Mo, W) can interact with apo-hTf on a common binding site with the amino acid residues Leu-46, Ile-49, Arg-50, Leu-66, Asp-69, Ala-70, Leu-72, Ala-73, Pro-74 and Asn-75, while the next four Cp2M(IV)Cl2 (M(IV)=Nb, Ti, Zr, Hf) showed different binding sites, unknown until now. A decreasing order in the total score (equal to -log Kd) was observed from these docking studies: W (5.4356), Mo (5.2692), Nb (5.1672), V (4.5973), Ti (3.6529), Zr (2.0054) and Hf (1.8811). High and significant correlation between the affinity of these seven ligands (metallocenes) for apo-hTf and their bond angles CpMCp (r=0.94, p<0.01) and Cl-M-Cl (r=0.95, p<0.01) were observed, thus indicating the important role that these bond angles can play in ligand-protein interactions. Fluorescence spectra of apo-hTf, measured at pH 7.4, had a decrease in the fluorescence emission spectrum with increasing concentration of Cp2M(IV)Cl2. Experimental data has a good correlation between KA (r=0.84, p=0.027) and Kd (r=0.94, p=0.0014) values and the calculated total scores obtained from our docking experiments. In conclusion, these results suggest that the seven Cp2M(IV)Cl2 used for this study can interact with apo-hTf, and their affinity was directly and inversely proportional to their bond angles CpMCp and ClMCl, respectively. Our docking studies also suggest that the binding of the first three Cp2M(IV)Cl2 (M(IV)=V, Mo, W) to hTf could abrogate the formation of the hTf-receptor complex, and as a consequence the metallocene-hTf complex might require another transport mechanism in order to get into the cell.
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Affiliation(s)
- Jorge R Güette-Fernández
- Department of Chemistry at Mayagüez, University of Puerto Rico, Mayagüez, PR 00681; Environmental and Computational Chemistry Group, School of Pharmaceutical Sciences, Zaragocilla Campus, University of Cartagena, 130014, Cartagena, Colombia
| | - Enrique Meléndez
- Department of Chemistry at Mayagüez, University of Puerto Rico, Mayagüez, PR 00681
| | - Wilson Maldonado-Rojas
- Environmental and Computational Chemistry Group, School of Pharmaceutical Sciences, Zaragocilla Campus, University of Cartagena, 130014, Cartagena, Colombia
| | - Carlos Ortega-Zúñiga
- Department of Chemistry at Mayagüez, University of Puerto Rico, Mayagüez, PR 00681; Environmental and Computational Chemistry Group, School of Pharmaceutical Sciences, Zaragocilla Campus, University of Cartagena, 130014, Cartagena, Colombia
| | - Jesus Olivero-Verbel
- Environmental and Computational Chemistry Group, School of Pharmaceutical Sciences, Zaragocilla Campus, University of Cartagena, 130014, Cartagena, Colombia
| | - Elsie I Parés-Matos
- Department of Chemistry at Mayagüez, University of Puerto Rico, Mayagüez, PR 00681.
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Chen J, Luo Z, Zhao Z, Xie L, Zheng W, Chen T. Cellular localization of iron(II) polypyridyl complexes determines their anticancer action mechanisms. Biomaterials 2015; 71:168-177. [DOI: 10.1016/j.biomaterials.2015.08.031] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 08/13/2015] [Accepted: 08/16/2015] [Indexed: 01/13/2023]
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9
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Biological evaluation of bismuth non-steroidal anti-inflammatory drugs (BiNSAIDs): Stability, toxicity and uptake in HCT-8 colon cancer cells. J Inorg Biochem 2014; 135:28-39. [DOI: 10.1016/j.jinorgbio.2014.02.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 02/05/2014] [Accepted: 02/18/2014] [Indexed: 11/22/2022]
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10
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Miersch L, Rüffer T, Schaarschmidt D, Lang H, Troff RW, Schalley CA, Mehring M. Synthesis and Characterization of Polynuclear Oxidobismuth Sulfonates. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201315] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Linda Miersch
- Technische Universität Chemnitz, Institut für Chemie, Koordinationschemie, Straße der Nationen 62, 09111 Chemnitz, Germany, http://www.tu‐chemnitz.de/chemie/koord/
| | - Tobias Rüffer
- Technische Universität Chemnitz, Institut für Chemie, Anorganische Chemie, Straße der Nationen 62, 09111 Chemnitz, Germany
| | - Dieter Schaarschmidt
- Technische Universität Chemnitz, Institut für Chemie, Anorganische Chemie, Straße der Nationen 62, 09111 Chemnitz, Germany
| | - Heinrich Lang
- Technische Universität Chemnitz, Institut für Chemie, Anorganische Chemie, Straße der Nationen 62, 09111 Chemnitz, Germany
| | - Ralf W. Troff
- Freie Universität Berlin, Institut für Chemie und Biochemie, Takustraße 3, 14195 Berlin, Germany
| | - Christoph A. Schalley
- Freie Universität Berlin, Institut für Chemie und Biochemie, Takustraße 3, 14195 Berlin, Germany
| | - Michael Mehring
- Technische Universität Chemnitz, Institut für Chemie, Koordinationschemie, Straße der Nationen 62, 09111 Chemnitz, Germany, http://www.tu‐chemnitz.de/chemie/koord/
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11
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Main-Group Medicinal Chemistry Including Li and Bi*. COMPREHENSIVE INORGANIC CHEMISTRY II 2013. [PMCID: PMC7152213 DOI: 10.1016/b978-0-08-097774-4.00338-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Main-group element compounds were among the first developed in the modern era as pharmaceutical preparations for the treatment of a wide variety of human ailments; it is now recognized that many of these elements exist in traditional medicine of many societies, for example, arsenic. The use of main-group element compounds in contemporary medicine continues for the treatment of, for example, depression (Li), stomach ulcers (Bi), cancer (As and Ga), and leishmaniasis (Sb). Not surprisingly, new compounds of these elements, and other main-group elements, continue to be investigated for their potential use in new therapies. In this chapter, the use of main-group elements as therapeutic agents is outlined and also, where understood, comments on biological targets and mechanisms of action. Further, key advances in new potential applications of main-group element compounds in medicine are evaluated.
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12
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Iron and bismuth bound human serum transferrin reveals a partially-opened conformation in the N-lobe. Sci Rep 2012; 2:999. [PMID: 23256035 PMCID: PMC3525939 DOI: 10.1038/srep00999] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Accepted: 11/26/2012] [Indexed: 11/17/2022] Open
Abstract
Human serum transferrin (hTF) binds Fe(III) tightly but reversibly, and delivers it to cells via a receptor-mediated endocytosis process. The metal-binding and release result in significant conformational changes of the protein. Here, we report the crystal structures of diferric-hTF (FeNFeC-hTF) and bismuth-bound hTF (BiNFeC-hTF) at 2.8 and 2.4 Å resolutions respectively. Notably, the N-lobes of both structures exhibit unique “partially-opened” conformations between those of the apo-hTF and holo-hTF. Fe(III) and Bi(III) in the N-lobe coordinate to, besides anions, only two (Tyr95 and Tyr188) and one (Tyr188) tyrosine residues, respectively, in contrast to four residues in the holo-hTF. The C-lobe of both structures are fully closed with iron coordinating to four residues and a carbonate. The structures of hTF observed here represent key conformers captured in the dynamic nature of the transferrin family proteins and provide a structural basis for understanding the mechanism of metal uptake and release in transferrin families.
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He Y, Chen S, Liu Y, Liang Y, Xiang J, Wu D, Zhou F. Coordination of Bi3+ to metal-free metallothionein: spectroscopy and density functional calculation of structure, coordination, and electronic excitations. J Inorg Biochem 2012; 113:9-14. [PMID: 22687489 DOI: 10.1016/j.jinorgbio.2012.02.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 02/15/2012] [Accepted: 02/15/2012] [Indexed: 11/24/2022]
Abstract
Understanding the structure of mammal Bi-containing metallothionein-2 (Bi-MT2) is of great physiological significance due to the importance of Bi-MT2 in alleviating adverse effect of anti-cancer drugs. A unique feature of rabbit liver Bi-MT2 is the metal-oxygen bond (BiO), which is absent in well-characterized Zn-MT2 and Cd-MT2. However, the ligand contributing to the BiO bonding in Bi-MT2 remains unidentified. In this study, the coordination of Bi(3+) to rabbit liver metal-free metallothionein was investigated using both experimental and theoretical methods. UV-visible and circular dichroism spectra indicate that Bi-MT2 has a different secondary structure from those of Zn-MT2 and Cd-MT2. Three possible Bi(3+) coordination structures in Bi(7)-MT2 and relative binding free energies were calculated using the density functional theory. Absorption spectra corresponding to these coordination structures were evaluated by time-dependent density functional theory. Our computation results are consistent with the UV-vis spectroscopic data and strongly suggest that the carboxyl group in the aspartic acid residues contributes to the BiO bond formation.
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Affiliation(s)
- Yonghui He
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China
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14
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The binding and transport of alternative metals by transferrin. Biochim Biophys Acta Gen Subj 2012; 1820:362-78. [DOI: 10.1016/j.bbagen.2011.07.003] [Citation(s) in RCA: 112] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2011] [Revised: 06/28/2011] [Accepted: 07/06/2011] [Indexed: 11/24/2022]
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Castillo E, Pérez MD, Franco I, Calvo M, Sánchez L. Kinetic and thermodynamic parameters for heat denaturation of human recombinant lactoferrin from rice. Biochem Cell Biol 2012; 90:389-96. [PMID: 22332867 DOI: 10.1139/o11-073] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Heat denaturation of recombinant human lactoferrin (rhLf) from rice with 3 different iron-saturation degrees, holo rhLf (iron-saturated), AsIs rhLf (60% iron saturation), and apo rhLf (iron-depleted), was studied. The 3 forms of rhLf were subjected to heat treatment, and the kinetic and thermodynamic parameters of the denaturation process were determined. Thermal denaturation of rhLf was assessed by measuring the loss of reactivity against specific antibodies. D(t) values (time to reduce 90% of immunoreactivity) decreased with increasing temperature of treatment for apo and holo rhLf, those values being higher for the iron-saturated form, which indicates that iron confers thermal stability to rhLf. However, AsIs rhLf showed a different behaviour with an increase in resistance to heat between 79 °C and 84 °C, so that the kinetic parameters could not be calculated. The heat denaturation process for apo and holo rhLf was best described assuming a reaction order of 1.5. The activation energy of the denaturation process was 648.20 kJ/mol for holo rhLf and 406.94 kJ/mol for apo rhLf, confirming that iron-depleted rhLf is more sensitive to heat treatment than iron-saturated rhLf.
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Affiliation(s)
- Eduardo Castillo
- Tecnología de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Miguel Servet, 177, 50013, Zaragoza, Spain
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Li H, Sun H. Recent advances in bioinorganic chemistry of bismuth. Curr Opin Chem Biol 2012; 16:74-83. [PMID: 22322154 PMCID: PMC7108238 DOI: 10.1016/j.cbpa.2012.01.006] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 01/05/2012] [Accepted: 01/09/2012] [Indexed: 01/21/2023]
Abstract
Bismuth has been used in medicine for over two centuries for the treatment of various diseases, in particular for gastrointestinal disorders, owing to its antimicrobial activity. Recent structural characterization of bismuth drugs provides an insight into assembly and pharmacokinetic pathway of the drugs. Mining potential protein targets inside the pathogen via metallomic/metalloproteomic approach and further characterization on the interactions of bismuth drugs with these targets laid foundation in understanding the mechanism of action of bismuth drugs. Such studies would be beneficial in rational design of new potential drugs.
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Witkowska D, Rowinska-Zyrek M, Valensin G, Kozlowski H. Specific poly-histidyl and poly-cysteil protein sites involved in Ni2+ homeostasis in Helicobacter pylori. Impact of Bi3+ ions on Ni2+ binding to proteins. Structural and thermodynamic aspects. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.06.014] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Drewry JA, Gunning PT. Recent advances in biosensory and medicinal therapeutic applications of zinc(II) and copper(II) coordination complexes. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.10.018] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Wegner SV, Ertem E, Sunbul M, He C. Metal-binding properties of Hpn from Helicobacter pylori and implications for the therapeutic activity of bismuth. Chem Sci 2011. [DOI: 10.1039/c0sc00411a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Yang N, An Y, Cai J, Hu L, Zeng Y, Mao Z, Chen G, Sun H. Polymeric architectures of bismuth citrate based on dimeric building blocks. Sci China Chem 2010; 53:2152-2158. [PMID: 32214995 PMCID: PMC7088795 DOI: 10.1007/s11426-010-4113-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Accepted: 07/19/2010] [Indexed: 12/26/2022]
Abstract
Four bismuth complexes, (H2En)[Bi2(cit)2(H2O)4/3]·(H2O)x (1), (H2En)3[Bi2(cit)2Cl4]·(H2O)x (2), (HPy)2[Bi2(cit)2(H2O)8/5]·(H2O)x (3) and (H2En)[Bi2(cit)2](H2O)x (4) [cit = citrate4−; En = ethylenediamine; Py = pyridine] have been synthesized and crystallized. The crystal structures reveal that the basic building blocks in all of these complexes are bismuth citrate dimeric units which combine to form polymeric architectures. The embedded protonated ethylenediamine and pyridine moieties in the polymeric frameworks have been identified by X-ray crystallography and solid-state cross polarization/magic angle spinning (CP/MAS) 13C NMR. Based on the framework of complex 1, a structural model of a clinically used antiulcer drug, ranitidine bismuth citrate (RBC) was generated. The behavior of the protonated amine-bismuth citrate complexes in acidic aqueous solution has been studied by electrospray ionization-mass spectrometry (ESI-MS).
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Affiliation(s)
- Nan Yang
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Yan An
- School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275 China
- Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai, 201306 China
| | - JiWen Cai
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, 510080 China
| | - LiHong Hu
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - YiBo Zeng
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - ZongWan Mao
- School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275 China
| | - GuanHua Chen
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - HongZhe Sun
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
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Sun H, Chai ZF. Metallomics: An integrated science for metals in biology and medicine. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b920672h] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Halwani M, Hebert S, Suntres ZE, Lafrenie RM, Azghani AO, Omri A. Bismuth–thiol incorporation enhances biological activities of liposomal tobramycin against bacterial biofilm and quorum sensing molecules production by Pseudomonas aeruginosa. Int J Pharm 2009; 373:141-6. [DOI: 10.1016/j.ijpharm.2009.02.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2008] [Revised: 01/27/2009] [Accepted: 02/02/2009] [Indexed: 11/28/2022]
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Sun X, Tsang CN, Sun H. Identification and characterization of metallodrug binding proteins by (metallo)proteomics. Metallomics 2009. [DOI: 10.1039/b813121j] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Sun X, Ge R, Chiu JF, Sun H, He QY. Lipoprotein MtsA of MtsABC inStreptococcus pyogenesprimarily binds ferrous ion with bicarbonate as a synergistic anion. FEBS Lett 2008; 582:1351-4. [DOI: 10.1016/j.febslet.2008.03.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2008] [Revised: 03/14/2008] [Accepted: 03/14/2008] [Indexed: 01/06/2023]
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Ge R, Sun X, Gu Q, Watt RM, Tanner JA, Wong BCY, Xia HH, Huang JD, He QY, Sun H. A proteomic approach for the identification of bismuth-binding proteins in Helicobacter pylori. J Biol Inorg Chem 2007; 12:831-42. [PMID: 17503094 DOI: 10.1007/s00775-007-0237-7] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2007] [Accepted: 04/02/2007] [Indexed: 02/07/2023]
Abstract
Helicobacter pylori is a major human pathogen that can cause peptic ulcers and chronic gastritis. Bismuth-based triple or quadruple therapies are commonly recommended for the treatment of H. pylori infections. However, the molecular mechanisms underlying treatment with bismuth are currently not fully understood. We have conducted a detailed comparative proteomic analysis of H. pylori cells both before and after treatment with colloidal bismuth subcitrate (CBS). Eight proteins were found to be significantly upregulated or downregulated in the presence of CBS (20 microg mL(-1)). Bismuth-induced oxidative stress was confirmed by detecting higher levels of lipid hydroperoxide (approximately 1.8 times) and hemin (approximately 3.4 times), in whole cell extracts of bismuth-treated H. pylori cells, compared with those from untreated cells. The presence of bismuth also led to an approximately eightfold decrease in cellular protease activities. Using immobilized-bismuth affinity chromatography, we isolated and subsequently identified seven bismuth-binding proteins from H. pylori cell extracts. The intracellular levels of four of these proteins (HspA, HspB, NapA and TsaA) were influenced by the addition of CBS, which strongly suggests that they interact directly with bismuth. The other bismuth-interacting proteins identified were two enzymes (fumarase and the urease subunit UreB), and a translational factor (Ef-Tu). Our data suggest that the inhibition of proteases, modulation of cellular oxidative stress and interference with nickel homeostasis may be key processes underlying the molecular mechanism of bismuth's actions against H. pylori.
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Affiliation(s)
- Ruiguang Ge
- Department of Chemistry and Open Laboratory of Chemical Biology, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
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Shoji H, Oguchi S, Shinohara K, Shimizu T, Yamashiro Y. Effects of iron-unsaturated human lactoferrin on hydrogen peroxide-induced oxidative damage in intestinal epithelial cells. Pediatr Res 2007; 61:89-92. [PMID: 17211147 DOI: 10.1203/01.pdr.0000250198.22735.20] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Human milk (HM) contains various bioactive antioxidants. Lactoferrin (Lf) has been assumed to be one of the major antioxidants in HM. We examined the antioxidative properties of iron-unsaturated human Lf (apo-hLf, the major form of Lf in HM) in two intestinal epithelial cell lines: (1) An intestinal epithelial cell line (IEC-6) were preincubated for 24 h with either 50 microg/mL of apo-hLf, iron-saturated human Lf (holo-hLf), iron-unsaturated bovine transferrin (apo-bTf), or 800 ng/mL of the iron-chelating compound deferoxamine (DFX), followed by hydrogen peroxide (H2O2) challenge to induce oxidative stress. Survival rates were significantly higher in the cells preincubated with apo-hLf and DFX than those preincubated with holo-hLf. (2) Caco-2 cells were preincubated with or without apo-hLf for 24 h, followed by an H2O2 challenge. Intracellular oxidative stress was assessed by a fluorescent probe, 2',7'-dichlorodihydrofluorescein diacetate (DCF-DA). Fluorescent intensity of cell images and cell homogenates was significantly lower in the cells preincubated with apo-hLF than those preincubated without apo-hLF. Our study indicates that apo-hLf alleviates H2O2-induced oxidative damage in intestinal cells due to the iron-chelating capacity. Therefore, Lf in HM may act as an antioxidant in the gastrointestinal tract (GIT).
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Affiliation(s)
- Hiromichi Shoji
- Department of Pediatrics and Adolescent Medicine, Juntendo University School of Medicine, 113-0033 Tokyo, Japan.
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Chen R, So MH, Yang J, Deng F, Che CM, Sun H. Fabrication of bismuth subcarbonate nanotube arrays from bismuth citrate. Chem Commun (Camb) 2006:2265-7. [PMID: 16718324 DOI: 10.1039/b601764a] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bismuth subcarbonate ((BiO)2CO3) nanotubes with uniform diameters of about 3-5 nm were fabricated from bismuth citrate; these nanotubes exhibit antibacterial properties against Helicobacter pylori (50% inhibition at 10 microg mL(-1)), a bacterium causing peptic ulcers and gastritis.
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Affiliation(s)
- Rong Chen
- Department of Chemistry and Open Laboratory of Chemical Biology of the Institute of Molecular Technology for Drug Discovery and Synthesis, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China
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Pannequin J, Kovac S, Tantiongco JP, Norton RS, Shulkes A, Barnham KJ, Baldwin GS. A novel effect of bismuth ions: selective inhibition of the biological activity of glycine-extended gastrin. J Biol Chem 2003; 279:2453-60. [PMID: 14530269 DOI: 10.1074/jbc.m309806200] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Although bismuth salts have been used for over two centuries for the treatment of various gastrointestinal disorders, the mechanism of their therapeutic action remains controversial. Because gastrins bind two trivalent ferric ions with high affinity, and because ferric ions are essential for the biological activity of glycine-extended gastrin 17, we have investigated the hypothesis that trivalent bismuth ions influence the biological activity of gastrins. Binding of bismuth ions to gastrins was measured by fluorescence quenching and NMR spectroscopy. The effects of bismuth ions on gastrin-stimulated biological activities were measured in inositol phosphate, cell proliferation, and cell migration assays. Fluorescence quenching experiments indicated that both glycine-extended and amidated gastrin 17 bound two bismuth ions. The NMR spectral changes observed on addition of bismuth ions revealed that Glu-7 acted as a ligand at the first bismuth ion binding site. In the presence of bismuth ions the ability of glycine-extended gastrin 17 to stimulate inositol phosphate production, cell proliferation, and cell migration was markedly reduced. In contrast, bismuth ions had little effect on the affinity of the CCK-2 receptor for amidated gastrin 17, or on the stimulation of inositol phosphate production by amidated gastrin 17. We conclude that bismuth ions may act, at least in part, by blocking the effects of glycine-extended gastrin 17 on cell proliferation and cell migration in the gastrointestinal tract. This is the first report of a specific inhibitory effect of bismuth ions on the action of a gastrointestinal hormone.
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Affiliation(s)
- Julie Pannequin
- Department of Surgery, University of Melbourne, Austin Campus, ARMC, Heidelberg, Victoria 3084, Australia
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Sun H, Szeto KY. Binding of bismuth to serum proteins: implication for targets of Bi(III) in blood plasma. J Inorg Biochem 2003; 94:114-20. [PMID: 12620681 DOI: 10.1016/s0162-0134(02)00649-9] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Bismuth complexes have been widely used in clinical treatment as antiulcer drugs. However, different adverse effects have been observed and the diagnosis is generally confirmed by the detection of bismuth in blood or blood plasma. In this study, binding of bismuth to human serum albumin was studied by fluorescence spectroscopy with the binding constant logK(a) to be 11.2. Competitive binding of bismuth to human albumin and transferrin was carried out at pH 7.4 by FPLC and ICP-MS. It was found that over 70% of bismuth binds to transferrin even in the presence of a large excess of albumin (albumin/transferrin=13:1) at pH 7.4, 10 mM bicarbonate. The distribution of bismuth between the two proteins was almost unchanged when Cys(34) of albumin was blocked. However, all bismuth binds to albumin when iron-saturated transferrin was used. Almost all of the bismuth was distributed over the fractions containing transferrin (70%) and albumin (<30%) in serum. The percentage of bismuth associated with transferrin was further increased by 15% with elevated transferrin in serum. Binding of bismuth to transferrin is much stronger than human albumin. Transferrin is probably the major target of bismuth in blood plasma, and it may play a role in the pharmacology of bismuth.
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Affiliation(s)
- Hongzhe Sun
- Department of Chemistry and Open Laboratory of Chemical Laboratory, University of Hong Kong, Pokfulam Road, Hong Kong, PR China.
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Du XL, Zhang TL, Yuan L, Zhao YY, Li RC, Wang K, Yan SC, Zhang L, Sun H, Qian ZM. Complexation of ytterbium to human transferrin and its uptake by K562 cells. EUROPEAN JOURNAL OF BIOCHEMISTRY 2002; 269:6082-90. [PMID: 12473103 DOI: 10.1046/j.1432-1033.2002.03326.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
There is an increasing interest in the use of lanthanides in medicine. However, the mechanism of their accumulation in cells is not well understood. Lanthanide cations are similar to ferric ions with regard to transferrin binding, suggesting transferrin-receptor mediated transport is possible; however, this has not yet been confirmed. In order to clarify this mechanism, we investigated the binding of Yb3+ to apotransferrin by UV-Vis spectroscopy and stopped-flow spectrophotometry, and found that Yb3+ binds to apotransferrin at the specific iron sites in the presence of bicarbonate. The apparent binding constants of these sites showed that the affinity of Yb3+ is lower than that of Fe3+and binding of Yb3+ in the N-lobe is kinetically favored while the C-lobe is thermodynamically favored. The first Yb3+ bound to the C-lobe quantitatively with a Yb/apotransferrin molar ratio of < 1, whereas the binding to the other site is weaker and approaches completeness by a higher molar ratio only. As demonstrated by 1H NMR spectra, Yb3+ binding disturbed the conformation of apotransferrin in a manner similar to Fe3+. Flow cytometric studies on the uptake of fluorescein isothiocyanate labeled Yb3+-bound transferrin species by K562 cells showed that they bind to the cell receptors. Laser scanning confocal microscopic studies with fluorescein isothiocyanate labeled Yb3+-bound transferrin and propidium iodide labeled DNA and RNA in cells indicated that the Yb3+ entered the cells. The Yb3+-transferrin complex inhibited the uptake of the fluorescein labeled ferric-saturated transferrin (Fe2-transferrin) complex into K562 cells. The results demonstrate that the complex of Yb3+-transferrin complex was recognized by the transferrin receptor and that the transferrin-receptor-mediated mechanism is a possible pathway for Yb3+ accumulation in cells.
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Affiliation(s)
- Xiu-Lian Du
- Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing, China
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Abstract
Since transferrin was discovered more than half a century ago, a considerable effort has been made towards understanding tranferrin-mediated iron uptake. However, it was not until recently with the identification and characterization of several new genes related to iron homeostasis, such as the hemochromatosis protein HFE and the iron transporter DMT1, that our knowledge has been advanced dramatically. A major pathway for cellular iron uptake is through internalization of the complex of iron-bound transferrin and the transferrin receptor, which is negatively modulated by HFE, a protein related to hereditary hemochromatosis. Iron is released from transferrin as the result of the acidic pH in endosome and then is transported to the cytosol by DMT1. The iron is then utilized as a cofactor by heme and ribonucleotide reductase or stored in ferritin. Apart from iron, many other metal ions of therapeutic and diagnostic interests can also bind to transferrin at the iron sites and their transferrin complexes can be recognized by many cells. Therefore, transferrin has been thought as a "delivery system" for many beneficial and harmful metal ions into the cells. Transferrin has also be widely applied as a targeting ligand in the active targeting of anticancer agents, proteins, and genes to primary proliferating malignant cells that overexpress transferrin receptors. This is achieved by conjugation of transferrin with drugs, proteins, hybride systems with marcomolecules and as liposomal-coated systems. Conjugates of anticancer drugs with transferrin can significantly improve the selectivity and toxicity and overcome drug resistance, thereby leading to a better treatment. The coupling of DNA to transferrin via a polycation such as polylysine or via cationic liposomes can target and transfer of the extrogenous DNA particularly into proliferating cells through receptor-mediated endocytosis. These kinds of non-viral vectors are potential alternatives to viral vectors for gene therapy, if the transfection efficiency can be improved. Moreover, transferrin receptors have shown potentials in delivery of therapeutic drugs or genes into the brain across blood-brain barrier.
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Affiliation(s)
- Hongyan Li
- Laboratory of Iron Metabolism, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Kowloon, Hong Kong
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Li H, Sun H, Qian ZM. The role of the transferrin-transferrin-receptor system in drug delivery and targeting. Trends Pharmacol Sci 2002; 23:206-9. [PMID: 12007993 DOI: 10.1016/s0165-6147(02)01989-2] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Exploration of the potential of site-specific and target-oriented drug delivery systems has gained interest recently. Indeed, the efficient cellular mechanism of transferrin uptake has been exploited for the delivery not only of anticancer drugs and proteins, but also of therapeutic genes into proliferating malignant cells that overexpress transferrin receptors. In particular, the transferrin receptor offers great promise in the delivery of therapeutic agents across the blood-brain barrier to the brain.
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Affiliation(s)
- Hongyan Li
- Dept of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Kowloon, Hong Kong
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