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Chen Z, Wang X, Luo J, Zhang B, Shen F, Li B, Yang J. Synthesis and characterization of rod-like amino acids/nanohydroxyapatite composites to inhibit osteosarcoma. RSC Adv 2022; 12:36103-36114. [PMID: 36545101 PMCID: PMC9756758 DOI: 10.1039/d2ra03784j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 10/26/2022] [Indexed: 12/23/2022] Open
Abstract
In this study, rod-like hydroxyapatite (HA) with uniform morphology and controllable particle size modified by doping with two different amino acids (alanine and threonine) was synthesized by a microwave hydrothermal method. The physical and chemical properties of the composites were tested by utilizing X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), general thermogravimetric analysis (TG) and scanning electron microscopy (SEM). The SEM and XRD results show that the presence of amino acids (especially threonine) can significantly reduce the aspect ratio and crystallinity of hydroxyapatite. Pure hydroxyapatite and modified hydroxyapatite doped with two different proportions of amino acids were cultured with mouse osteoblasts (MC3T3-E1) for 1, 3 and 5 days, respectively, nanohydroxyapatite modified by threonine has better biocompatibility compared with pure hydroxyapatite. The amino acid-modified hydroxyapatite samples were co-cultured with osteosarcoma cells (MG63) for 1, 4 and 7 days, respectively, and showed better inhibitory effects on osteosarcoma cells. The nanohydroxyapatite doped with amino acids could be used as a potential drug that promotes bone repair and inhibits the growth of osteosarcoma cells.
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Affiliation(s)
- Zhengxiong Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of TechnologyWuhan 430070P. R. China,Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan University of TechnologyWuhan 430070P. R. China
| | - Xinyu Wang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of TechnologyWuhan 430070P. R. China,Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen ValleyFoshan 528200P. R. China,Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan University of TechnologyWuhan 430070P. R. China
| | - Jing Luo
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of TechnologyWuhan 430070P. R. China,Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan University of TechnologyWuhan 430070P. R. China
| | - Bowen Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of TechnologyWuhan 430070P. R. China,Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan University of TechnologyWuhan 430070P. R. China
| | - Fei Shen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of TechnologyWuhan 430070P. R. China,Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan University of TechnologyWuhan 430070P. R. China
| | - Binbin Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of TechnologyWuhan 430070P. R. China,Biomedical Materials and Engineering Research Center of Hubei Province, Wuhan University of TechnologyWuhan 430070P. R. China
| | - Jing Yang
- School of Foreign Languages, Wuhan University of TechnologyWuhan 430070P. R. China
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Jenner LP, Kurth JM, van Helmont S, Sokol KP, Reisner E, Dahl C, Bradley JM, Butt JN, Cheesman MR. Heme ligation and redox chemistry in two bacterial thiosulfate dehydrogenase (TsdA) enzymes. J Biol Chem 2019; 294:18002-18014. [PMID: 31467084 PMCID: PMC6879331 DOI: 10.1074/jbc.ra119.010084] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/26/2019] [Indexed: 01/04/2023] Open
Abstract
Thiosulfate dehydrogenases (TsdAs) are bidirectional bacterial di-heme enzymes that catalyze the interconversion of tetrathionate and thiosulfate at measurable rates in both directions. In contrast to our knowledge of TsdA activities, information on the redox properties in the absence of substrates is rather scant. To address this deficit, we combined magnetic CD (MCD) spectroscopy and protein film electrochemistry (PFE) in a study to resolve heme ligation and redox chemistry in two representative TsdAs. We examined the TsdAs from Campylobacter jejuni, a microaerobic human pathogen, and from the purple sulfur bacterium Allochromatium vinosum. In these organisms, the enzyme functions as a tetrathionate reductase and a thiosulfate oxidase, respectively. The active site Heme 1 in both enzymes has His/Cys ligation in the ferric and ferrous states and the midpoint potentials (Em) of the corresponding redox transformations are similar, −185 mV versus standard hydrogen electrode (SHE). However, fundamental differences are observed in the properties of the second, electron transferring, Heme 2. In C. jejuni, TsdA Heme 2 has His/Met ligation and an Em of +172 mV. In A. vinosum TsdA, Heme 2 reduction triggers a switch from His/Lys ligation (Em, −129 mV) to His/Met (Em, +266 mV), but the rates of interconversion are such that His/Lys ligation would be retained during turnover. In summary, our findings have unambiguously assigned Em values to defined axial ligand sets in TsdAs, specified the rates of Heme 2 ligand exchange in the A. vinosum enzyme, and provided information relevant to describing their catalytic mechanism(s).
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Affiliation(s)
- Leon P Jenner
- Centre for Molecular and Structural Biochemistry, School of Chemistry and School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom
| | - Julia M Kurth
- Institut für Mikrobiologie & Biotechnologie, Rheinische Friedrich Wilhelms Universität Bonn, D-53115 Bonn, Germany
| | - Sebastian van Helmont
- Institut für Mikrobiologie & Biotechnologie, Rheinische Friedrich Wilhelms Universität Bonn, D-53115 Bonn, Germany
| | - Katarzyna P Sokol
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Erwin Reisner
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Christiane Dahl
- Institut für Mikrobiologie & Biotechnologie, Rheinische Friedrich Wilhelms Universität Bonn, D-53115 Bonn, Germany
| | - Justin M Bradley
- Centre for Molecular and Structural Biochemistry, School of Chemistry and School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom
| | - Julea N Butt
- Centre for Molecular and Structural Biochemistry, School of Chemistry and School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom
| | - Myles R Cheesman
- Centre for Molecular and Structural Biochemistry, School of Chemistry and School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom
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Chreifi G, Dejam D, Poulos TL. Crystal structure and functional analysis of Leishmania major pseudoperoxidase. J Biol Inorg Chem 2017; 22:919-927. [PMID: 28584975 DOI: 10.1007/s00775-017-1469-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 05/23/2017] [Indexed: 11/25/2022]
Abstract
Leishmania major pseudoperoxidase (LmPP) is a recently discovered heme protein expressed by the human pathogen. Previous in vivo and in vitro studies suggest that LmPP is a crucial element of the pathogen's defense mechanism against the reactive nitrogen species peroxynitrite produced during the host immune response. To shed light on the potential mechanism of peroxynitrite detoxification, we have determined the 1.76-Å X-ray crystal structure of LmPP, revealing a striking degree of homology with heme peroxidases. The most outstanding structural feature is a Cys/His heme coordination, which corroborates previous spectroscopic and mutagenesis studies. We also used a combination of stopped-flow and electron paramagnetic spectroscopies that together suggest that peroxynitrite is not a substrate for LmPP catalysis, leaving the function of LmPP an open question.
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Affiliation(s)
- Georges Chreifi
- Department of Molecular Biology and Biochemistry, University of California, Irvine, CA, 92697-3900, USA
| | - Dillon Dejam
- Department of Molecular Biology and Biochemistry, University of California, Irvine, CA, 92697-3900, USA
| | - Thomas L Poulos
- Department of Molecular Biology and Biochemistry, University of California, Irvine, CA, 92697-3900, USA.
- Department of Chemistry, University of California, Irvine, CA, USA.
- Department of Pharmaceutical Sciences, University of California, Irvine, CA, USA.
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Corti P, Ieraci M, Tejero J. Characterization of zebrafish neuroglobin and cytoglobins 1 and 2: Zebrafish cytoglobins provide insights into the transition from six-coordinate to five-coordinate globins. Nitric Oxide 2015; 53:22-34. [PMID: 26721561 DOI: 10.1016/j.niox.2015.12.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 12/11/2015] [Accepted: 12/19/2015] [Indexed: 12/30/2022]
Abstract
Neuroglobin (Ngb) and cytoglobin (Cygb) are two six-coordinate heme proteins of unknown physiological function. Although studies on the mammalian proteins have elucidated aspects of Ngb and Cygb biophysics and indicated potential functions, the properties of non-mammalian Ngbs and Cygbs are largely uncharacterized. We have expressed the recombinant zebrafish proteins Ngb, Cygb1, and Cygb2 in Escherichia coli and characterized their nitrite reduction rates, spectral properties, autoxidation rate constants, redox potentials and lipid binding properties. The three zebrafish proteins can catalyze the reduction of nitrite to nitric oxide with a broad range of reaction rate constants. (Ngb, 0.68 ± 0.04 M(-1) s(-1); Cygb1, 28.6 ± 3.1 M(-1) s(-1); Cygb2, 0.94 ± 0.18 M(-1) s(-1)). We observe that zebrafish Ngb and Cygb2 have comparable spectral features to those of human Ngb and Cygb, consistent with a six-coordinate heme, whereas unexpectedly Cygb1 has a five-coordinate heme, a slower autoxidation and in general has properties more akin to oxygen transport proteins. In agreement with a possible oxygen carrier and nitrite reductase role, we detect mRNA transcript for Cygb1 but not Cygb2 or Ngb in zebrafish blood. Unlike human Cygb, neither of the zebrafish globins binds oleic acid with high affinity. This finding suggests that lipid binding may be a trait acquired later during evolution and not an ancestral property of cytoglobins. Altogether, our results uncover unexpected properties of zebrafish globins and reveal the pivotal role of cytoglobins in the transition of heme globins from six-coordinate to five-coordinate oxygen carriers and nitrite reductases.
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Affiliation(s)
- Paola Corti
- Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Matthew Ieraci
- Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Jesús Tejero
- Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA 15261, USA; Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
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Tong J, Zweier JR, Huskey RL, Ismail RS, Hemann C, Zweier JL, Liu X. Effect of temperature, pH and heme ligands on the reduction of Cygb(Fe(3+)) by ascorbate. Arch Biochem Biophys 2014; 554:1-5. [PMID: 24780244 DOI: 10.1016/j.abb.2014.04.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 04/14/2014] [Accepted: 04/21/2014] [Indexed: 01/08/2023]
Abstract
Cytoglobin (Cygb) plays a role in regulating vasodilation in response to changes in local oxygen concentration by altering the rate of nitric oxide (NO) metabolism. Because the reduction of Cygb(Fe(3+)) by a reductant is the control step for Cygb-mediated NO metabolism, we examined the effects of temperature, pH, and heme ligands on the Cygb(Fe(3+)) reduction by ascorbate (Asc) under anaerobic conditions. The standard enthalpy of Cygb(Fe(3+)) reduction by Asc was determined to be 42.4 ± 3.1 kJ/mol. The rate of Cygb(Fe(3+)) reduction increased ~6% per °C when temperature varied from 35°C to 40°C. The yield and the rate of Cygb(Fe(3+)) reduction significantly increases with pH (2-3 times per pH unit), paralleling the formation of the Asc ion (A(2-)) and the increased stability of reduced state of heme iron at high pH values. Heme ligand cyanide (CN(-)) decreased the yield and the rate of Cygb(Fe(3+)) reduction, but ligands CO and NO allowed the process of Cygb(Fe(3+)) reduction to continue to completion. Critical information is provided for modeling and prediction of the process of Cygb-mediated NO metabolism in vessels in a range of temperature and pH values.
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Affiliation(s)
- Jianjing Tong
- Emergency Department, Shanghai Ruijin Hospital, Shanghai Jiaotong University School of Medicine, 197 Ruijin Er Road, Shanghai 200025, China; Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Joseph R Zweier
- Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Rachael L Huskey
- Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Raed S Ismail
- Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Craig Hemann
- Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Jay L Zweier
- Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA; Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, OH, USA.
| | - Xiaoping Liu
- Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, Columbus, OH, USA; Department of Internal Medicine, The Ohio State University College of Medicine, Columbus, OH, USA.
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