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Parida C, Chowdhuri S. Effects of Hydrogen Peroxide on the Hydrogen Bonding Structure and Dynamics of Water and Its Influence on the Aqueous Solvation of the Insulin Monomer. J Phys Chem B 2023; 127:10814-10823. [PMID: 38055728 DOI: 10.1021/acs.jpcb.3c05107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
The hydrogen bond structure and dynamics of water and hydrogen peroxide (H2O2) in their binary mixtures have been studied at 298 K by classical molecular dynamics simulations. Twelve different concentrations of aqueous-H2O2 solutions are considered for this study. We have analyzed the interactions between water and H2O2 by site-site pair correlation functions and observed that the probability of formation of OW···HP hydrogen bonds are higher compared to OP···HW. The second solvation shell of water is strongly affected by increasing H2O2 concentrations (XP > 0.50), which signifies the destruction of the tetrahedral network structure of water. The translational and rotational dynamics of water and H2O2 do not significantly change up to 25% of H2O2 in aqueous mixtures. The hydrogen bond lifetime of water-water, water-H2O2, and H2O2-H2O2 in the aqueous-H2O2 solutions shows a very minimal change with increasing H2O2 concentrations. In addition to this, we also investigated the effect of H2O2 on the insulin monomer and observed that higher concentrations of H2O2 (XP = 0.10) change the secondary structure. The influence of H2O2 is more on chain-B than that on chain-A in the insulin monomer. The H2O2 occupancy at the protein surface is higher for negatively charged (GLU) and polar (ASN and THR) amino acid residues compared with that for positively charged and neutral residues in the solutions.
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Affiliation(s)
- Chinmay Parida
- School of Basic Sciences, Indian Institute of Technology, Bhubaneswar 752050, India
| | - Snehasis Chowdhuri
- School of Basic Sciences, Indian Institute of Technology, Bhubaneswar 752050, India
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2
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Giaretta J, Duan H, Oveissi F, Farajikhah S, Dehghani F, Naficy S. Flexible Sensors for Hydrogen Peroxide Detection: A Critical Review. ACS APPLIED MATERIALS & INTERFACES 2022; 14:20491-20505. [PMID: 35486920 PMCID: PMC9104121 DOI: 10.1021/acsami.1c24727] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Hydrogen peroxide (H2O2) is a common chemical used in many industries and can be found in various biological environments, water, and air. Yet, H2O2 in a certain range of concentrations can be hazardous and toxic. Therefore, it is crucial to determine its concentration at different conditions for safety and diagnostic purposes. This review provides an insight about different types of sensors that have been developed for detection of H2O2. Their flexibility, stability, cost, detection limit, manufacturing, and challenges in their applications have been compared. More specifically the advantages and disadvantages of various flexible substrates that have been utilized for the design of H2O2 sensors were discussed. These substrates include carbonaceous substrates (e.g., reduced graphene oxide films, carbon cloth, carbon, and graphene fibers), polymeric substrates, paper, thin glass, and silicon wafers. Many of these substrates are often decorated with nanostructures composed of Pt, Au, Ag, MnO2, Fe3O4, or a conductive polymer to enhance the performance of sensors. The impact of these nanostructures on the sensing performance of resulting flexible H2O2 sensors has been reviewed in detail. In summary, the detection limits of these sensors are within the range of 100 nM-1 mM, which makes them potentially, but not necessarily, suitable for applications in health, food, and environmental monitoring. However, the required sample volume, cost, ease of manufacturing, and stability are often neglected compared to other detection parameters, which hinders sensors' real-world application. Future perspectives on how to address some of the substrate limitations and examples of application-driven sensors are also discussed.
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Affiliation(s)
- Jacopo
E. Giaretta
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Haowei Duan
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Farshad Oveissi
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Syamak Farajikhah
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
- The
University of Sydney, Sydney Nano Institute, Camperdown, 2006 New South Wales, Australia
- Institute
of Photonics and Optical Sciences (IPOS), School of Physics, The University of Sydney, Camperdown, 2006 New South Wales, Australia
| | - Fariba Dehghani
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
- The
University of Sydney, Sydney Nano Institute, Camperdown, 2006 New South Wales, Australia
- F.D. ()
| | - Sina Naficy
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
- The
University of Sydney, Sydney Nano Institute, Camperdown, 2006 New South Wales, Australia
- S.N. ()
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3
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Ugone V, Pisanu F, Garribba E. Interaction of pharmacologically active pyrone and pyridinone vanadium(IV,V) complexes with cytochrome c. J Inorg Biochem 2022; 234:111876. [DOI: 10.1016/j.jinorgbio.2022.111876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/05/2022] [Accepted: 05/21/2022] [Indexed: 01/11/2023]
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4
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Avdonin PP, Trufanov SK, Rybakova EY, Tsitrina AA, Goncharov NV, Avdonin PV. The Use of Fluorescently Labeled ARC1779 Aptamer for Assessing the Effect of H2O2 on von Willebrand Factor Exocytosis. BIOCHEMISTRY (MOSCOW) 2021; 86:123-131. [PMID: 33832411 DOI: 10.1134/s0006297921020012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Here, we propose a new approach for quantitative estimation of von Willebrand factor (vWF) exposed on the surface of endothelial cells (ECs) using the ARC1779 aptamer that interacts with the vWF A1 domain. To visualize complex formation between vWF and the aptamer, the latter was conjugated with the Cy5 fluorescent label. Cultured human umbilical vein endothelial cells (HUVEC) were stained with the ARC1779-Cy5 conjugate and imaged with a fluorescence microscope. The images were analyzed with the CellProfiler software. vWF released from the Weibel-Palade bodies was observed as bright dot-like structures of round and irregular shape, the number of which increased several times after HUVEC exposure to histamine or thrombin. Staining with ARC1779-Cy5 also revealed long filamentous vWF structures on the surface of activated HUVEC. vWF secretion by ECs is activated by the second messengers cAMP and Ca2+. There is evidence that hydrogen peroxide also acts as a second messenger in ECs. In addition, exogenous H2O2 formed in leukocytes can enter ECs. The aim of our study was to determine the effect of H2O2 on the vWF exposure at the surface of HUVEC using the proposed method. It was shown that hydrogen peroxide at concentration 100 µM, which is lower than the cytotoxicity threshold of H2O2 for cultured HUVEC, increased several times the number of dot-like structures and total amount of vWF exposed on plasma membrane of HUVEC, which suggest that H2O2 acts as a mediator that activates exocytosis of Weibel-Palade bodies and vWF secretion in the vascular endothelium during inflammation and upon elevated generation of endogenous reactive oxygen species in ECs.
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Affiliation(s)
- Piotr P Avdonin
- Koltsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, 119334, Russia
| | - Sergey K Trufanov
- Koltsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, 119334, Russia
| | - Elena Yu Rybakova
- Koltsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, 119334, Russia
| | - Aleksandra A Tsitrina
- Koltsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, 119334, Russia
| | - Nikolay V Goncharov
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, 194223, Russia.,Research Institute of Hygiene, Occupational Pathology and Human Ecology, Federal Medical-Biological Agency, Kuzmolovsky, Leningrad Region, 188663, Russia
| | - Pavel V Avdonin
- Koltsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, 119334, Russia.
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5
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Zhong SS, Zhang J, Liu ZH, Dang Z, Liu Y. Inhibition Properties of Arylsulfatase and β-Glucuronidase by Hydrogen Peroxide, Hypochlorite, and Peracetic Acid. ACS OMEGA 2021; 6:8163-8170. [PMID: 33817475 PMCID: PMC8014925 DOI: 10.1021/acsomega.0c06060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Accepted: 03/01/2021] [Indexed: 05/04/2023]
Abstract
Arylsulfatase and β-glucuronidase are two important enzymes in humans, which play an important role in the dynamic equilibrium of steroidal estrogens. This work probably for the first time reported that hydrogen peroxide (H2O2), hypochlorite, and peracetic acid (PAA) could effectively inhibit the activities of arylsulfatase and/or β-glucuronidase. The 50% of inhibitions (IC50) of H2O2, hypochlorite, and PAA on arylsulfatase were found to be 142.90 ± 9.00, 91.83 ± 10.01, and 43.46 ± 2.92 μM, respectively. The corresponding IC50 values of hypochlorite and PAA on β-glucuronidase were 704.90 ± 41.40 and 23.26 ± 0.82 μM, whereas H2O2 showed no inhibition on β-glucuronidase. The inhibitions of arylsulfatase and/or β-glucuronidase by these three chemicals were pH-dependent. It was further revealed that the inhibitions of hypochlorite on both arylsulfatase and β-glucuronidase were irreversible. On the contrary, the inhibitions by H2O2 and PAA were reversible. In addition, the inhibition by H2O2 was competitive and that by PAA was noncompetitive. In general, H2O2 and hypochlorite can be endogenously produced in humans, which suggested that the two compounds are potential endocrine disruption compounds (EDCs) as they can cause endocrine disruption via the inhibition of arylsulfatase and β-glucuronidase. This work further indicated that any agent that can induce the production of H2O2 or hypochlorite in humans is a potential EDC, which explains why some EDCs with very weak or no estrogenic potency can cause endocrine disruption, which is confirmed in epidemiological studies.
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Affiliation(s)
- Shu-Shu Zhong
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China
| | - Jun Zhang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China
| | - Ze-Hua Liu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China
- Key Laboratory Pollution Control & Ecosystem Restoration in Industry Cluster, Ministry of Education, Guangzhou 510006, Guangdong, China
- Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, Guangdong, China
- Guangdong Provincial Engineering and Technology Research Center for Environment Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou 510006, Guangdong, China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China
| | - Yu Liu
- Advanced Environmental Biotechnology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, CleanTech One, Singapore 637141, Singapore
- School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore
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6
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Biswas A, Mallik BS. Conformation-induced vibrational spectral dynamics of hydrogen peroxide and vicinal water molecules. Phys Chem Chem Phys 2021; 23:6665-6676. [PMID: 33710191 DOI: 10.1039/d0cp06028c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We studied the conformation-induced spectral response of water molecules due to site-specific structural alterations of solvated hydrogen peroxide (H2O2) employing DFT-based first principles molecular dynamics (FPMD) simulations. Wavelet transform was used to determine the time-dependent frequencies of the hydroxyls of water molecules and the O-H stretch modes of H2O2. Shifts in the vibrational frequency of the hydrogen-bonded hydroxyls inside the solvation shell of H2O2 support multiple distinctive hydrogen bonding environments. This paper classifies two distinct hydrogen bond types inside the O-OW solvation shell of H2O2, and the dynamical calculations provide a quantitative estimation of the relative hydrogen bond strength. We ascertain the reason for not observing the escape of water molecules from the hydrogen peroxide hydration shell, unlike the solvation shell of ionic solutions and neutral solutes. Besides, we provide a comprehensive analysis of the spectral shifts in the normalized frequency distribution, the time-dependent decay of frequency-frequency correlation functions, and the hydrogen bond length scale fluctuations. We also quantify the relative contribution of the cisoid and transoid conformers affecting the vibrational spectral signature of the vicinal water molecules. While the transoid conformers promote the hydrogen bonding interactions through the oxygen site (OHW), the cisoid conformers facilitate hydrogen peroxide-water hydrogen bond formation through the hydrogen site (HOW). These non-identical hydrogen bond associations stabilize hydrogen peroxide in water.
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Affiliation(s)
- Aritri Biswas
- Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy-502285, Telangana, India.
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7
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Gaikwad R, Thangaraj PR, Sen AK. Direct and rapid measurement of hydrogen peroxide in human blood using a microfluidic device. Sci Rep 2021; 11:2960. [PMID: 33536535 PMCID: PMC7858642 DOI: 10.1038/s41598-021-82623-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 01/22/2021] [Indexed: 02/07/2023] Open
Abstract
The levels of hydrogen peroxide (\documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2) in human blood is of great relevance as it has emerged as an important signalling molecule in a variety of disease states. Fast and reliable measurement of \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2 levels in the blood, however, continues to remain a challenge. Herein we report an automated method employing a microfluidic device for direct and rapid measurement of \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2 in human blood based on laser-induced fluorescence measurement. Our study delineates the critical factors that affect measurement accuracy—we found blood cells and soluble proteins significantly alter the native \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2 levels in the time interval between sample withdrawal and detection. We show that separation of blood cells and subsequent dilution of the plasma with a buffer at a ratio of 1:6 inhibits the above effect, leading to reliable measurements. We demonstrate rapid measurement of \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2 in plasma in the concentration range of 0–49 µM, offering a limit of detection of 0.05 µM, a sensitivity of 0.60 µM−1, and detection time of 15 min; the device is amenable to the real-time measurement of \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2 in the patient’s blood. Using the linear correlation obtained with known quantities of \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2, the endogenous \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2 concentration in the blood of healthy individuals is found to be in the range of 0.8–6 µM. The availability of this device at the point of care will have relevance in understanding the role of \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{H}}_{2}{\mathrm{O}}_{2}$$\end{document}H2O2 in health and disease.
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Affiliation(s)
- R Gaikwad
- Micro Nano Bio-Fluidics Unit, Fluid Systems Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India
| | - P R Thangaraj
- Department of Cardiothoracic Surgery, Apollo Hospital, Chennai, 600006, India
| | - A K Sen
- Micro Nano Bio-Fluidics Unit, Fluid Systems Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India.
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8
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Yang C, Yang C, Li X, Zhang A, He G, Wu Q, Liu X, Huang S, Huang X, Cui G, Hu N, Xie X, Hang T. Liquid-like Polymer Coating as a Promising Candidate for Reducing Electrode Contamination and Noise in Complex Biofluids. ACS APPLIED MATERIALS & INTERFACES 2021; 13:4450-4462. [PMID: 33443399 DOI: 10.1021/acsami.0c18419] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Biosensors that can automatically and continuously track fluctuations in biomarker levels over time are essential for real-time sensing in biomedical and environmental applications. Although many electrochemical sensors have been developed to quickly and sensitively monitor biomarkers, their sensing stability in complex biofluids is disturbed by unavoidable nonspecific adhesion of proteins or bacteria. Recently, various substrate surface modification techniques have been developed to resist biofouling, yet functionalization of electrodes in sensors to be anti-biofouling is rarely achieved. Here, we report an integrated three-electrode system (ITES) modified with a "liquid-like" polydimethylsiloxane (PDMS) brush that can continuously and stably monitor reactive oxygen species (ROS) in complex fluids. Based on the slippery "liquid-like" coating, the modified ITES surface could prevent the adhesion of various liquids as well as the adhesion of proteins and bacteria. The "liquid-like" coating does not significantly affect the sensitivity of the electrode in detecting ROS, while the sensing performance could remain stable and free of bacterial attack even after 3 days of incubation with bacteria. In addition, the PDMS brush-modified ITES (PMITES) could continuously record ROS levels in bacterial-rich fluids with excellent stability over 24 h due to the reduced bacterial contamination on the electrode surface. This technique offers new opportunities for continuous and real-time monitoring of biomarkers that will facilitate the development of advanced sensors for biomedical and environmental applications.
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Affiliation(s)
- Chengduan Yang
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Cheng Yang
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Xiangling Li
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
- School of Biomedical Engineering, Sun Yat-Sen University, Guangzhou 510080, China
| | - Aihua Zhang
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Gen He
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Qianni Wu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou 510080, China
| | - Xingxing Liu
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Shuang Huang
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Xinshuo Huang
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Guofeng Cui
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510080, China
| | - Ning Hu
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
| | - Xi Xie
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou 510080, China
| | - Tian Hang
- The First Affiliated Hospital of Sun Yat-Sen University; State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510080, China
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Biswas A, Mallik BS. Conformational dynamics of aqueous hydrogen peroxide from first principles molecular dynamics simulations. Phys Chem Chem Phys 2020; 22:28286-28296. [PMID: 33295373 DOI: 10.1039/d0cp05451h] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We performed first principles molecular dynamics simulations of a relatively dilute aqueous hydrogen peroxide (H2O2) solution to examine its structural alterations and relevant dynamics upon solvation. The internal rotation of the OH groups about the O-O bond facilitates the flexible structure of H2O2. Structural calculations reveal dihedral angle fluctuations in the aqueous solution. Water molecules make stronger hydrogen bonds through the hydrogen atom of the solute than the oxygen atom leading to distinct hydrogen bonding configurations inside the first solvation shell. Time-dependent dihedral angle alterations result in conformational changes and the normalized dihedral angle distribution plot displays characteristic peaks at ∼100-120° and ∼230°, illustrating various conformational states. Within the simulation time, flexibility-induced interconversion of hydrogen peroxide gives rise to several cisoid and transoid conformers. In this study, we examine the relative population of the associated conformational states and the lifetime of the cisoid and transoid conformers from the torsion angle variations. We also determine the free energy landscape of the rotational isomerization process in H2O2 and explore two distinct energy barriers during such interconversion.
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Affiliation(s)
- Aritri Biswas
- Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy - 502285, Telangana, India.
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10
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Mantri Y, Davidi B, Lemaster JE, Hariri A, Jokerst JV. Iodide-doped precious metal nanoparticles: measuring oxidative stress in vivo via photoacoustic imaging. NANOSCALE 2020; 12:10511-10520. [PMID: 32396928 PMCID: PMC7331795 DOI: 10.1039/d0nr03047c] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Accumulation of reactive oxygen and nitrogen species (RONS) can induce cell damage and even cell death. RONS are short-lived species, which makes direct, precise, and real-time measurement difficult. Biologically-relevant RONS levels are in the nM-μM scale; hence, there is a need for highly sensitive RONS probes. We previously used hybrid gold-core silver-shell nanoparticles with mM sensitivity to H2O2. These particles reported the presence of RONS via spectral shifts which could easily be quantified via photoacoustic imaging. Here, we used halide doping to tune the electrochemical properties of these materials to better match the oxidation potential of RONS. This work describes the synthesis, characterization, and application of these AgI-coated gold nanorods (AgI/AuNR). The I : Ag molar ratio, pH, and initial Ag shell thickness were optimized for good RONS detection limits. Halide doping lowers the reduction potential of Ag from to resulting in a 1000-fold increase in H2O2 and 100 000-fold increase in ONOO- sensitivity. The AgI/AuNR system also etches 45-times faster than undoped Ag/AuNR. The AgI/AuNR easily reported the endogenously produced RONS in established cells lines as well as murine models.
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Affiliation(s)
- Yash Mantri
- Department of Bioengineering University of California, San Diego, La Jolla, CA, USA
| | - Barak Davidi
- Department of Physics, Fairfield University, Fairfield, CT, USA
| | - Jeanne E Lemaster
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, USA.
| | - Ali Hariri
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, USA.
| | - Jesse V Jokerst
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, USA. and Materials Science Program, University of California, San Diego, La Jolla, CA, USA and Department of Radiology, University of California, San Diego, La Jolla, CA, USA
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11
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Hoshi Y, Uchida Y, Tachikawa M, Ohtsuki S, Couraud PO, Suzuki T, Terasaki T. Oxidative stress-induced activation of Abl and Src kinases rapidly induces P-glycoprotein internalization via phosphorylation of caveolin-1 on tyrosine-14, decreasing cortisol efflux at the blood-brain barrier. J Cereb Blood Flow Metab 2020; 40:420-436. [PMID: 30621530 PMCID: PMC7370610 DOI: 10.1177/0271678x18822801] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Exposure of the brain to high levels of glucocorticoids during ischemia-reperfusion induces neuronal cell death. Oxidative stress alters blood-brain barrier (BBB) function during ischemia-reperfusion, and so we hypothesized that it might impair P-glycoprotein (P-gp)-mediated efflux transport of glucocorticoids at the BBB. Therefore, the purpose of this study was to clarify the molecular mechanism of this putative decrease of P-gp-mediated efflux function. First, we established that H2O2 treatment of a human in vitro BBB model (hCMEC/D3) reduced both P-gp efflux transport activity and protein expression on the plasma membrane within 20 min. These results suggested that the rapid decrease of efflux function might be due to internalization of P-gp. Furthermore, H2O2 treatment markedly increased tyrosine-14-phosphorylated caveolin-1, which is involved in P-gp internalization. A brain perfusion study in rats showed that cortisol efflux at the BBB was markedly decreased by H2O2 administration, and inhibitors of Abl kinase and Src kinase, which phosphorylate tyrosine-14 in caveolin-1, suppressed this decrease. Overall, these findings support the idea that oxidative stress-induced activation of Abl kinase and Src kinase induces internalization of P-gp via the phosphorylation of tyrosine-14 in caveolin-1, leading to a rapid decrease of P-gp-mediated cortisol efflux at the BBB.
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Affiliation(s)
- Yutaro Hoshi
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Yasuo Uchida
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Masanori Tachikawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Sumio Ohtsuki
- Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | | | - Takashi Suzuki
- Department of Pathology and Histotechnology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Tetsuya Terasaki
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
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12
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Uzunoglu A, Ipekci HH. The use of CeO2-modified Pt/C catalyst inks for the construction of high-performance enzyme-free H2O2 sensors. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113302] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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13
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Molecular imaging of oxidative stress using an LED-based photoacoustic imaging system. Sci Rep 2019; 9:11378. [PMID: 31388020 PMCID: PMC6684596 DOI: 10.1038/s41598-019-47599-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 07/19/2019] [Indexed: 12/22/2022] Open
Abstract
LED-based photoacoustic imaging has practical value in that it is affordable and rugged; however, this technology has largely been confined to anatomic imaging with limited applications into functional or molecular imaging. Here, we report molecular imaging reactive oxygen and nitrogen species (RONS) with a near-infrared (NIR) absorbing small molecule (CyBA) and LED-based photoacoustic imaging equipment. CyBA produces increasing photoacoustic signal in response to peroxynitrite (ONOO−) and hydrogen peroxide (H2O2) with photoacoustic signal increases of 3.54 and 4.23-fold at 50 µM of RONS at 700 nm, respectively. CyBA is insensitive to OCl−, ˙NO, NO2−, NO3−, tBuOOH, O2−, C4H9O˙, HNO, and ˙OH, but can detect ONOO− in whole blood and plasma. CyBA was then used to detect endogenous RONS in macrophage RAW 246.7 cells as well as a rodent model; these results were confirmed with fluorescence microscopy. Importantly, CyB suffers photobleaching under a Nd:YAG laser but the signal decrease is <2% with the low-power LED-based photoacoustic system and the same radiant exposure time. To the best of our knowledge, this is the first report to describe molecular imaging with an LED-based photoacoustic scanner. This study not only reveals the sensitive photoacoustic detection of RONS but also highlights the utility of LED-based photoacoustic imaging.
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Liu F, Lin Z, Jin Q, Wu Q, Yang C, Chen HJ, Cao Z, Lin DA, Zhou L, Hang T, He G, Xu Y, Xia W, Tao J, Xie X. Protection of Nanostructures-Integrated Microneedle Biosensor Using Dissolvable Polymer Coating. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4809-4819. [PMID: 30628778 DOI: 10.1021/acsami.8b18981] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Real-time transdermal biosensing provides a direct route to quantify biomarkers or physiological signals of local tissues. Although microneedles (MNs) present a mini-invasive transdermal technique, integration of MNs with advanced nanostructures to enhance sensing functionalities has rarely been achieved. This is largely due to the fact that nanostructures present on MNs surface could be easily destructed due to friction during skin insertion. In this work, we reported a dissolvable polymer-coating technique to protect nanostructures-integrated MNs from mechanical destruction during MNs insertion. After penetration into the skin, the polymer could readily dissolve by interstitial fluids so that the superficial nanostructures on MNs could be re-exposed for sensing purpose. To demonstrate this technique, metallic and resin MNs decorated with vertical ZnO nanowires (vNWs) were employed as an example. Dissolvable poly(vinyl pyrrolidone) was spray-coated on the vNW-MNs surface as a protective layer, which effectively protected the superficial ZnO NWs when MNs penetrated the skin. Transdermal biosensing of H2O2 biomarker in skin tissue using the polymer-protecting MNs sensor was demonstrated both ex vivo and in vivo. The results indicated that polymer coating successfully preserved the sensing functionalities of the MNs sensor after inserting into the skin, whereas the sensitivity of the MN sensor without a coating protection was significantly compromised by 3-folds. This work provided unique opportunities of protecting functional nanomodulus on MNs surface for minimally invasive transdermal biosensing.
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Affiliation(s)
- Fanmao Liu
- Department of Hypertension and Vascular Disease, The First Affiliated Hospital , Sun Yat-sen University , 510080 Guangzhou , China
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Zhihong Lin
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Quanchang Jin
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Qianni Wu
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center , Sun Yat-sen University , 510060 Guangzhou , China
| | - Chengduan Yang
- Department of Hypertension and Vascular Disease, The First Affiliated Hospital , Sun Yat-sen University , 510080 Guangzhou , China
| | - Hui-Jiuan Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Zihan Cao
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Di-An Lin
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Lingfei Zhou
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Tian Hang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Gen He
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
| | - Yonghang Xu
- School of Materials Science and Energy Engineering , Foshan University , 528000 Foshan , China
| | - Wenhao Xia
- Department of Hypertension and Vascular Disease, The First Affiliated Hospital , Sun Yat-sen University , 510080 Guangzhou , China
| | - Jun Tao
- Department of Hypertension and Vascular Disease, The First Affiliated Hospital , Sun Yat-sen University , 510080 Guangzhou , China
| | - Xi Xie
- Department of Hypertension and Vascular Disease, The First Affiliated Hospital , Sun Yat-sen University , 510080 Guangzhou , China
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology , Sun Yat-sen University , 510006 Guangzhou , China
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Jin Q, Chen HJ, Li X, Huang X, Wu Q, He G, Hang T, Yang C, Jiang Z, Li E, Zhang A, Lin Z, Liu F, Xie X. Reduced Graphene Oxide Nanohybrid-Assembled Microneedles as Mini-Invasive Electrodes for Real-Time Transdermal Biosensing. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1804298. [PMID: 30605244 DOI: 10.1002/smll.201804298] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 12/14/2018] [Indexed: 06/09/2023]
Abstract
A variety of nanomaterial-based biosensors have been developed to sensitively detect biomolecules in vitro, yet limited success has been achieved in real-time sensing in vivo. The application of microneedles (MN) may offer a solution for painless and minimally-invasive transdermal biosensing. However, integration of nanostructural materials on microneedle surface as transdermal electrodes remains challenging in applications. Here, a transdermal H2 O2 electrochemical biosensor based on MNs integrated with nanohybrid consisting of reduced graphene oxide and Pt nanoparticles (Pt/rGO) is developed. The Pt/rGO significantly improves the detection sensitivity of the MN electrode, while the MNs are utilized as a painless transdermal tool to access the in vivo environment. The Pt/rGO nanostructures are protected by a water-soluble polymer layer to avoid mechanical destruction during the MN skin insertion process. The polymer layer can readily be dissolved by the interstitial fluid and exposes the Pt/rGO on MNs for biosensing in vivo. The applications of the Pt/rGO-integrated MNs for in situ and real-time sensing of H2 O2 in vivo are demonstrated both on pigskin and living mice. This work offers a unique real-time transdermal biosensing system, which is a promising tool for sensing in vivo with high sensitivity but in a minimally-invasive manner.
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Affiliation(s)
- Quanchang Jin
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Hui-Jiuan Chen
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Xiangling Li
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Xinshuo Huang
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Qianni Wu
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Gen He
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Tian Hang
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Chengduan Yang
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Zhen Jiang
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Enlai Li
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Aihua Zhang
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Zhihong Lin
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Fanmao Liu
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
| | - Xi Xie
- The First Affiliated Hospital of Sun Yat-sen University, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University, 510000, Guangzhou, China
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16
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Moßhammer M, Schrameyer V, Jensen PØ, Koren K, Kühl M. Extracellular hydrogen peroxide measurements using a flow injection system in combination with microdialysis probes - Potential and challenges. Free Radic Biol Med 2018; 128:111-123. [PMID: 29860128 DOI: 10.1016/j.freeradbiomed.2018.05.089] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 05/14/2018] [Accepted: 05/29/2018] [Indexed: 12/29/2022]
Abstract
There is a strong need for techniques that can quantify the important reactive oxygen species hydrogen peroxide (H2O2) in complex media and in vivo. We combined chemiluminescence-based H2O2 measurements on a commercially available flow injection analysis (FIA) system with sampling of the analyte using microdialysis probes (MDPs), typically used for measurements in tissue. This allows minimally invasive, quantitative measurements of extracellular H2O2 concentration and dynamics utilizing the chemiluminescent reaction of H2O2 with acridinium ester. By coupling MDPs to the FIA system, measurements are no longer limited to filtered, liquid samples with low viscosity, as sampling via a MDP is based on a dynamic exchange through a permeable membrane with a specific cut-off. This allows continuous monitoring of dynamic changes in H2O2 concentrations, alleviates potential pH effects on the measurements, and allows for flexible application in different media and systems. We give a detailed description of the novel experimental setup and its measuring characteristics along with examples of application in different media and organisms to highlight its broad applicability, but also to discuss current limitations and challenges. The combined FIA-MDP approach for H2O2 quantification was used in different biological systems ranging from marine biology, using the model organism Exaiptasia pallida (light stress induced H2O2 release up to ~ 2.7 µM), over biomedical applications quantifying enzyme dynamics (glucose oxidase in a glucose solution producing up to ~ 60 µM H2O2 and the subsequent addition of catalase to monitor the H2O2 degradation process) and the ability of bacteria to modify their direct environment by regulating H2O2 concentrations in their surrounding media. This was shown by the bacteria Pseudomonas aeruginosa degrading ~ 18 µM background H2O2 in LB-broth. We also discuss advantages and current limitations of the FIA-MDP system, including a discussion of potential cross-sensitivity and interfering chemical species.
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Affiliation(s)
- Maria Moßhammer
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark
| | - Verena Schrameyer
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark
| | - Peter Ø Jensen
- Department of Clinical Microbiology, Rigshospitalet, Denmark; Department of Immunology and Microbiology, Costerton Biofilm Center, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Klaus Koren
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark; Department of Bioscience - Microbiology, University of Aarhus, Denmark.
| | - Michael Kühl
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark; Climate Change Cluster, University of Technology Sydney, Australia.
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KAWASAKI A, YASUDA M, MAWATARI KI, FUKUUCHI T, YAMAOKA N, KANEKO K, IIJIMA R, YUI S, SATOH M, NAKAGOMI K. Sensitive Analysis of Sialic Acid and Related Compound by Hydrophilic Interaction Liquid Chromatography Using Fluorescence Detection after Derivatization with DBD-PZ. ANAL SCI 2018; 34:841-844. [DOI: 10.2116/analsci.18n001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
| | | | | | | | | | | | | | - Satoru YUI
- Faculty of Pharma-Science, Teikyo University
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18
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Role of Beta-adrenergic Receptors and Sirtuin Signaling in the Heart During Aging, Heart Failure, and Adaptation to Stress. Cell Mol Neurobiol 2017; 38:109-120. [DOI: 10.1007/s10571-017-0557-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 10/06/2017] [Indexed: 01/03/2023]
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19
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Possibilities and Challenges for Quantitative Optical Sensing of Hydrogen Peroxide. CHEMOSENSORS 2017. [DOI: 10.3390/chemosensors5040028] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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20
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Sanna D, Ugone V, Serra M, Garribba E. Speciation of potential anti-diabetic vanadium complexes in real serum samples. J Inorg Biochem 2017; 173:52-65. [PMID: 28499214 DOI: 10.1016/j.jinorgbio.2017.04.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/28/2017] [Accepted: 04/23/2017] [Indexed: 10/19/2022]
Abstract
In this work the speciation in real serum samples of five VIVO complexes with potential application in the therapy of diabetes was studied through EPR spectroscopy as a function of V concentration (45.4, 90.9 and 454.5μM) and time (0-180min). [VO(dhp)2], [VO(ma)2], [VO(acac)2], [VO(pic)2(H2O)], and [VO(mepic)2], where Hdhp indicates 1,2-dimethyl-3-hydroxy-4(1H)-pyridinone, Hma maltol, Hacac acetylacetone, Hpic picolinic acid, and Hmepic 6-methylpicolinic acid, were examined. The distribution of VIVO2+ among the serum bioligands was calculated from the thermodynamic stability constants in the literature and compared with the experimental results. EPR results, which confirm the prediction, depend on the strength of the ligand L and geometry assumed by the bis-chelated species at physiological pH, cis-octahedral or square pyramidal. With dhp, the strongest chelator, the system is dominated by [VO(dhp)2] and/or cis-VO(dhp)2(Protein); with intermediate strength chelators, i.e. maltolate, acetylacetonate and picolinate, by cis-VO(ma)2(Protein), [VO(acac)2] or [VO(pic)(citrH-1)]3-/[VO(pic)(lactH-1)]- (citr=citrate and lact=lactate) when the V concentration overcomes 100-200μM and by (VO)(hTf)/(VO)2(hTf) when concentration is lower than 100μM; with the weakest chelator, 6-methylpicolinate, (VO)(hTf)/(VO)2(hTf), (VO)(HSA) (hTf = human serum transferrin and HSA = human serum albumin), and VO(mepic)(Protein)(OH) are the major species at concentration higher than 100-200μM, whereas hydrolytic processes are observed for lower concentrations. For [VO(dhp)2], [VO(ma)2], [VO(acac)2] and [VO(pic)2(H2O)], the EPR spectra remain unaltered with elapsing time, while for mepic they change significantly because the hydrolyzed VIVO species are complexed by the serum bioligands, in particular by lactate. The rate of oxidation in the serum is [VO(dhp)2]>[VO(ma)2]>[VO(acac)2] and reflects the order of E1/2 values.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy.
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Maria Serra
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy.
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21
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Graczyk H, Lewinski N, Zhao J, Sauvain JJ, Suarez G, Wild P, Danuser B, Riediker M. Increase in oxidative stress levels following welding fume inhalation: a controlled human exposure study. Part Fibre Toxicol 2016; 13:31. [PMID: 27286820 PMCID: PMC4901438 DOI: 10.1186/s12989-016-0143-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 06/03/2016] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Tungsten inert gas (TIG) welding represents one of the most widely used metal joining processes in industry. It has been shown to generate a large majority of particles at the nanoscale and to have low mass emission rates when compared to other types of welding. Despite evidence that TIG fume particles may produce reactive oxygen species (ROS), limited data is available for the time course changes of particle-associated oxidative stress in exposed TIG welders. METHODS Twenty non-smoking male welding apprentices were exposed to TIG welding fumes for 60 min under controlled, well-ventilated settings. Exhaled breathe condensate (EBC), blood and urine were collected before exposure, immediately after exposure, 1 h and 3 h post exposure. Volunteers participated in a control day to account for oxidative stress fluctuations due to circadian rhythm. Biological liquids were assessed for total reducing capacity, hydrogen peroxide (H2O2), malondialdehyde (MDA), and 8-hydroxy-2'-deoxyguanosine (8-OHdG) concentrations at each time point. A linear mixed model was used to assess within day and between day differences. RESULTS Significant increases in the measured biomarkers were found at 3 h post exposure. At 3 h post exposure, we found a 24 % increase in plasma-H2O2 concentrations ([95%CI: 4 % to 46 %], p = 0.01); a 91 % increase in urinary-H2O2 ([2 % to 258 %], p = 0.04); a 14 % increase in plasma-8-OHdG ([0 % to 31 %], p = 0.049); and a 45 % increase in urinary-8-OHdG ([3 % to 105 %], p = 0.03). Doubling particle number concentration (PNC) exposure was associated with a 22 % increase of plasma-8-OHdG at 3 h post exposure (p = 0.01). CONCLUSION A 60-min exposure to TIG welding fume in a controlled, well-ventilated setting induced acute oxidative stress at 3 h post exposure in healthy, non-smoking apprentice welders not chronically exposed to welding fumes. As mass concentration of TIG welding fume particles is very low when compared to other types of welding, it is recommended that additional exposure metrics such as PNC are considered for occupational risk assessments. Our findings highlight the importance of increasing awareness of TIG welding fume toxicity, especially given the realities of welding workplaces that may lack ventilation; and beliefs among interviewed welders that TIG represents a cleaner and safer welding process.
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Affiliation(s)
- Halshka Graczyk
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, CH-1066, Switzerland
| | - Nastassja Lewinski
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, CH-1066, Switzerland.,Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA, 23284, USA
| | - Jiayuan Zhao
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, CH-1066, Switzerland.,Department of Environmental Health, Harvard T. H. Chan School of Public Health, Harvard University, 665 Huntington Ave., Boston, MA, 02115, USA
| | - Jean-Jacques Sauvain
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, CH-1066, Switzerland
| | - Guillaume Suarez
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, CH-1066, Switzerland
| | - Pascal Wild
- Department of Scientific Management, National Institute for Research and Security, INRS, Vandoeuvre, 54500, France
| | - Brigitta Danuser
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, CH-1066, Switzerland
| | - Michael Riediker
- Institute for Work and Health, University of Lausanne and Geneva, Lausanne, CH-1066, Switzerland. .,SAFENANO, IOM Singapore, Singapore, 048622, Singapore.
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22
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What is the concentration of hydrogen peroxide in blood and plasma? Arch Biochem Biophys 2016; 603:48-53. [PMID: 27173735 DOI: 10.1016/j.abb.2016.05.005] [Citation(s) in RCA: 183] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 04/29/2016] [Accepted: 05/03/2016] [Indexed: 01/21/2023]
Abstract
The concentration of hydrogen peroxide (H2O2) in blood and plasma is a measurement that has often been made, but the absolute values remain unsettled due the great variability of results actually published in the literature. As in every tissue, the concentration of H2O2 in blood and plasma is determined by the dynamics of its production versus its removal. The major sources of H2O2 in cells will only be briefly described as they are already well documented, The production of H2O2 in red blood cells will be described as it is less well known. But, the concentration of H2O2 within cells is more problematic. Intracellular H2O2 concentration has been estimated based on the kinetics of production and elimination, while its determination is technically difficult. Furthermore, compartmentalization and gradients result in its quantitation only as an average. The sources of extracellular H2O2, particularly in plasma, will also be described briefly. The major question addressed here however, is the actual concentration of H2O2 in plasma, which has been studied extensively, but still remains controversial.
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23
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Kitagishi H, Minegishi S, Yumura A, Negi S, Taketani S, Amagase Y, Mizukawa Y, Urushidani T, Sugiura Y, Kano K. Feedback Response to Selective Depletion of Endogenous Carbon Monoxide in the Blood. J Am Chem Soc 2016; 138:5417-25. [DOI: 10.1021/jacs.6b02211] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Saika Minegishi
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Aki Yumura
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Shigeru Negi
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Shigeru Taketani
- Department of Microbiology, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Yoko Amagase
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Yumiko Mizukawa
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Tetsuro Urushidani
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Yukio Sugiura
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Koji Kano
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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Hydrogen Peroxide and Sodium Transport in the Lung and Kidney. BIOMED RESEARCH INTERNATIONAL 2016; 2016:9512807. [PMID: 27073804 PMCID: PMC4814630 DOI: 10.1155/2016/9512807] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 03/04/2016] [Accepted: 03/08/2016] [Indexed: 02/07/2023]
Abstract
Renal and lung epithelial cells are exposed to some significant concentrations of H2O2. In urine it may reach 100 μM, while in the epithelial lining fluid in the lung it is estimated to be in micromolar to tens-micromolar range. Hydrogen peroxide has a stimulatory action on the epithelial sodium channel (ENaC) single-channel activity. It also increases stability of the channel at the membrane and slows down the transcription of the ENaC subunits. The expression and the activity of the channel may be inhibited in some other, likely higher, oxidative states of the cell. This review discusses the role and the origin of H2O2 in the lung and kidney. Concentration-dependent effects of hydrogen peroxide on ENaC and the mechanisms of its action have been summarized. This review also describes outlooks for future investigations linking oxidative stress, epithelial sodium transport, and lung and kidney function.
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Kloypan C, Srisa-art M, Mutirangura A, Boonla C. LINE-1 hypomethylation induced by reactive oxygen species is mediated via depletion of S-adenosylmethionine. Cell Biochem Funct 2015; 33:375-85. [PMID: 26178977 DOI: 10.1002/cbf.3124] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 05/27/2015] [Accepted: 06/08/2015] [Indexed: 01/06/2023]
Abstract
Whether long interspersed nuclear element-1 (LINE-1) hypomethylation induced by reactive oxygen species (ROS) was mediated through the depletion of S-adenosylmethionine (SAM) was investigated. Bladder cancer (UM-UC-3 and TCCSUP) and human kidney (HK-2) cell lines were exposed to 20 μM H2O2 for 72 h to induce oxidative stress. Level of LINE-1 methylation, SAM and homocysteine (Hcy) was measured in the H2O2 -exposed cells. Effects of α-tocopheryl acetate (TA), N-acetylcysteine (NAC), methionine, SAM and folic acid on oxidative stress and LINE-1 methylation in the H2O2 -treated cells were explored. Viabilities of cells treated with H2O2 were not significantly changed. Intracellular ROS production and protein carbonyl content were significantly increased, but LINE-1 methylation was significantly decreased in the H2O2 -treated cells. LINE-1 methylation was restored by TA, NAC, methionine, SAM and folic acid. SAM level in H2O2 -treated cells was significantly decreased, while total glutathione was significantly increased. SAM level in H2O2 -treated cells was restored by NAC, methionine, SAM and folic acid; while, total glutathione level was normalized by TA and NAC. Hcy was significantly decreased in the H2O2 -treated cells and subsequently restored by NAC. In conclusion, in bladder cancer and normal kidney cells exposed to H2O2 , SAM and Hcy were decreased, but total glutathione was increased. Treatments with antioxidants (TA and NAC) and one-carbon metabolites (SAM, methionine and folic acid) restored these changes. This pioneer finding suggests that exposure of cells to ROS activates glutathione synthesis via the transsulfuration pathway leading to deficiency of Hcy, which consequently causes SAM depletion and eventual hypomethylation of LINE-1.
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Affiliation(s)
- Chiraphat Kloypan
- Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Monpicha Srisa-art
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Apiwat Mutirangura
- Department of Anatomy, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Chanchai Boonla
- Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
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Liu Y, Zhu J, Xu Y, Qin Y, Jiang D. Boronic Acid Functionalized Aza-Bodipy (azaBDPBA) based Fluorescence Optodes for the Analysis of Glucose in Whole Blood. ACS APPLIED MATERIALS & INTERFACES 2015; 7:11141-11145. [PMID: 25962342 DOI: 10.1021/acsami.5b00265] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A near-infrared fluorescent dye (aza-bodipy or azaBDPBA) functionalized with boronic acid groups was synthesized for the preparation of optodes to measure glucose in 40-fold diluted whole blood. Boronic acid groups as an electron deficient group on aza-bodipy was reacted with hydrogen peroxide into an electron-rich phenolic group leading to the red-shift of emission wavelength from 682 to 724 nm. The emission in near-infrared region offered a low level of background interference from whole blood. Also, the dual-wavelength emission guaranteed our probe to measure glucose in whole blood accurately after the conversion of glucose into hydrogen peroxide using glucose oxidase. The measuring range of glucose from 0.2 to 200 mM in the buffer was achieved with high selectivity. To facilitate the blood test, the probe was immobilized into thin hydrophobic polymer films to prepare the disposal glucose optode, which could detect glucose in the solution from 60 μM to 100 mM. The concentration of glucose in 40-fold diluted whole blood was determined using our optode and the reference method, respectively. The consistence in the concentration obtained from these two assays revealed that our azaBDPBA-based optodes were promising for the clinic assay of glucose in the whole blood.
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Affiliation(s)
- Yueling Liu
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Jingwei Zhu
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Yanmei Xu
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Yu Qin
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Dechen Jiang
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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Oxidative stress, protein glycation and nutrition--interactions relevant to health and disease throughout the lifecycle. Proc Nutr Soc 2014; 73:430-8. [PMID: 24877772 DOI: 10.1017/s0029665114000603] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Protein glycation has been studied for over a century now and plays an important role in disease pathogenesis throughout the lifecycle. Strongly related to diabetic complications, glycation of Hb has become the gold standard method for diabetes diagnosis and monitoring. It is however attracting attention in normoglycaemia as well lately. Longitudinal studies increasingly suggest a positive relationship between glycation and the risk of chronic diseases in normoglycaemic individuals, but the mechanisms behind this association remain unclear. The interaction between glycation and oxidative stress may be particularly relevant in the normoglycaemic context, as suggested by recent epidemiological and in vitro evidence. In that context nutritional and lifestyle factors with an influence on redox status, such as smoking, fruit and vegetable and antioxidants consumption, may have the capacity to promote or inhibit glycation. However, experimental data from controlled trials are lacking the quality and rigour needed to reach firm conclusions. In the present review, we discuss the importance of glycation for health through the lifecycle and focus on the importance of oxidative stress as a driver for glycation. The importance of nutrition to modulate glycation is discussed, based on the evidence available and recommendations towards higher quality future research are made.
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Billaud M, Lohman AW, Johnstone SR, Biwer LA, Mutchler S, Isakson BE. Regulation of cellular communication by signaling microdomains in the blood vessel wall. Pharmacol Rev 2014; 66:513-69. [PMID: 24671377 DOI: 10.1124/pr.112.007351] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
It has become increasingly clear that the accumulation of proteins in specific regions of the plasma membrane can facilitate cellular communication. These regions, termed signaling microdomains, are found throughout the blood vessel wall where cellular communication, both within and between cell types, must be tightly regulated to maintain proper vascular function. We will define a cellular signaling microdomain and apply this definition to the plethora of means by which cellular communication has been hypothesized to occur in the blood vessel wall. To that end, we make a case for three broad areas of cellular communication where signaling microdomains could play an important role: 1) paracrine release of free radicals and gaseous molecules such as nitric oxide and reactive oxygen species; 2) role of ion channels including gap junctions and potassium channels, especially those associated with the endothelium-derived hyperpolarization mediated signaling, and lastly, 3) mechanism of exocytosis that has considerable oversight by signaling microdomains, especially those associated with the release of von Willebrand factor. When summed, we believe that it is clear that the organization and regulation of signaling microdomains is an essential component to vessel wall function.
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Affiliation(s)
- Marie Billaud
- Dept. of Molecular Physiology and Biophysics, University of Virginia School of Medicine, PO Box 801394, Charlottesville, VA 22902.
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29
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Corbi G, Conti V, Russomanno G, Longobardi G, Furgi G, Filippelli A, Ferrara N. Adrenergic signaling and oxidative stress: a role for sirtuins? Front Physiol 2013. [PMID: 24265619 DOI: 10.3389/fphys.2013.00324.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The adrenergic system plays a central role in stress signaling and stress is often associated with increased production of ROS. However, ROS overproduction generates oxidative stress, that occurs in response to several stressors. β-adrenergic signaling is markedly attenuated in conditions such as heart failure, with downregulation and desensitization of the receptors and their uncoupling from adenylyl cyclase. Transgenic activation of β2-adrenoceptor leads to elevation of NADPH oxidase activity, with greater ROS production and p38MAPK phosphorylation. Inhibition of NADPH oxidase or ROS significantly reduced the p38MAPK signaling cascade. Chronic β2-adrenoceptor activation is associated with greater cardiac dilatation and dysfunction, augmented pro-inflammatory and profibrotic signaling, while antioxidant treatment protected hearts against these abnormalities, indicating ROS production to be central to the detrimental signaling of β2-adrenoceptors. It has been demonstrated that sirtuins are involved in modulating the cellular stress response directly by deacetylation of some factors. Sirt1 increases cellular stress resistance, by an increased insulin sensitivity, a decreased circulating free fatty acids and insulin-like growth factor (IGF-1), an increased activity of AMPK, increased activity of PGC-1a, and increased mitochondrial number. Sirt1 acts by involving signaling molecules such P-I-3-kinase-Akt, MAPK and p38-MAPK-β. βAR stimulation antagonizes the protective effect of the AKT pathway through inhibiting induction of Hif-1α and Sirt1 genes, key elements in cell survival. More studies are needed to better clarify the involvement of sirtuins in the β-adrenergic response and, overall, to better define the mechanisms by which tools such as exercise training are able to counteract the oxidative stress, by both activation of sirtuins and inhibition of GRK2 in many cardiovascular conditions and can be used to prevent or treat diseases such as heart failure.
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Affiliation(s)
- Graziamaria Corbi
- Department of Medicine and Health Sciences, University of Molise Campobasso, Italy
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30
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Corbi G, Conti V, Russomanno G, Longobardi G, Furgi G, Filippelli A, Ferrara N. Adrenergic signaling and oxidative stress: a role for sirtuins? Front Physiol 2013; 4:324. [PMID: 24265619 PMCID: PMC3820966 DOI: 10.3389/fphys.2013.00324] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Accepted: 10/18/2013] [Indexed: 12/17/2022] Open
Abstract
The adrenergic system plays a central role in stress signaling and stress is often associated with increased production of ROS. However, ROS overproduction generates oxidative stress, that occurs in response to several stressors. β-adrenergic signaling is markedly attenuated in conditions such as heart failure, with downregulation and desensitization of the receptors and their uncoupling from adenylyl cyclase. Transgenic activation of β2-adrenoceptor leads to elevation of NADPH oxidase activity, with greater ROS production and p38MAPK phosphorylation. Inhibition of NADPH oxidase or ROS significantly reduced the p38MAPK signaling cascade. Chronic β2-adrenoceptor activation is associated with greater cardiac dilatation and dysfunction, augmented pro-inflammatory and profibrotic signaling, while antioxidant treatment protected hearts against these abnormalities, indicating ROS production to be central to the detrimental signaling of β2-adrenoceptors. It has been demonstrated that sirtuins are involved in modulating the cellular stress response directly by deacetylation of some factors. Sirt1 increases cellular stress resistance, by an increased insulin sensitivity, a decreased circulating free fatty acids and insulin-like growth factor (IGF-1), an increased activity of AMPK, increased activity of PGC-1a, and increased mitochondrial number. Sirt1 acts by involving signaling molecules such P-I-3-kinase-Akt, MAPK and p38-MAPK-β. βAR stimulation antagonizes the protective effect of the AKT pathway through inhibiting induction of Hif-1α and Sirt1 genes, key elements in cell survival. More studies are needed to better clarify the involvement of sirtuins in the β-adrenergic response and, overall, to better define the mechanisms by which tools such as exercise training are able to counteract the oxidative stress, by both activation of sirtuins and inhibition of GRK2 in many cardiovascular conditions and can be used to prevent or treat diseases such as heart failure.
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Affiliation(s)
- Graziamaria Corbi
- Department of Medicine and Health Sciences, University of Molise Campobasso, Italy
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31
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Ota T, Yasuda M, Iijima R, Yui S, Fukuuchi T, Yamaoka N, Mawatari KI, Kaneko K, Nakagomi K. Development of a fluorescence analysis method for N-acetylneuraminic acid and its oxidized product ADOA. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 932:152-7. [DOI: 10.1016/j.jchromb.2013.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 06/03/2013] [Accepted: 06/07/2013] [Indexed: 01/17/2023]
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Vlassopoulos A, Lean MEJ, Combet E. Role of oxidative stress in physiological albumin glycation: a neglected interaction. Free Radic Biol Med 2013; 60:318-24. [PMID: 23517782 DOI: 10.1016/j.freeradbiomed.2013.03.010] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 02/20/2013] [Accepted: 03/08/2013] [Indexed: 12/26/2022]
Abstract
Protein glycation is a key mechanism involved in chronic disease development in both diabetic and nondiabetic individuals. About 12-18% of circulating proteins are glycated in vivo in normoglycemic blood, but in vitro studies have hitherto failed to demonstrate glucose-driven glycation below a concentration of 30mM. Bovine serum albumin (BSA), reduced BSA (mercaptalbumin) (both 40g/L), and human plasma were incubated with glucose concentrations of 0-30mM for 4 weeks at 37°C. All were tested preoxidized for 8h before glycation with 10nM H2O2 or continuously exposed to 10nM H2O2 throughout the incubation period. Fructosamine was measured (nitroblue tetrazolium method) at 2 and 4 weeks. Oxidized BSA (both preoxidized and continuously exposed to H2O2) was more readily glycated than native BSA at all glucose concentrations (p = 0.03). Moreover, only oxidized BSA was glycated at physiological glucose concentration (5mM) compared to glucose-free control (glycation increased by 35% compared to native albumin, p < 0.05). Both 5 and 10mM glucose led to higher glycation when mercaptalbumin was oxidized than when unoxidized (p < 0.05). Fructosamine concentration in human plasma was also significantly higher when oxidized and exposed to 5mM glucose, compared to unoxidized plasma (p = 0.03). The interaction between glucose concentration and oxidation was significant in all protein models (p < 0.05). This study has for the first time demonstrated albumin glycation in vitro, using physiological concentrations of albumin, glucose, and hydrogen peroxide, identifying low-grade oxidative stress as a key element early in the glycation process.
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Affiliation(s)
- A Vlassopoulos
- Human Nutrition, School of Medicine, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow G3 8SJ, UK
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33
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CONTI VALERIA, RUSSOMANNO GIUSY, CORBI GRAZIAMARIA, GUERRA GERMANO, GRASSO CONCETTA, FILIPPELLI WALTER, PARIBELLO VIRGINIA, FERRARA NICOLA, FILIPPELLI AMELIA. Aerobic Training Workload Affects Human Endothelial Cells Redox Homeostasis. Med Sci Sports Exerc 2013; 45:644-53. [DOI: 10.1249/mss.0b013e318279fb59] [Citation(s) in RCA: 45] [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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34
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Al Ghouleh I, Frazziano G, Rodriguez AI, Csányi G, Maniar S, St Croix CM, Kelley EE, Egaña LA, Song GJ, Bisello A, Lee YJ, Pagano PJ. Aquaporin 1, Nox1, and Ask1 mediate oxidant-induced smooth muscle cell hypertrophy. Cardiovasc Res 2012; 97:134-42. [PMID: 22997161 DOI: 10.1093/cvr/cvs295] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS Reactive oxygen species (ROS)-mediated intracellular signalling is well described in the vasculature, yet the precise roles of ROS in paracrine signalling are not known. Studies implicate interstitial ROS hydrogen peroxide (H(2)O(2)) in vascular disease, and plasma H(2)O(2) levels in the micromolar range are detectable in animal models and humans with hypertension. Recently, H(2)O(2) was shown to cross biological membranes of non-vascular cells via aquaporin (Aqp) water channels. Previous findings suggest that H(2)O(2) activates NADPH oxidase (Nox) enzymes in vascular cells and apoptosis signal-regulating kinase 1 (Ask1) in non-vascular cells. We hypothesized that extracellular H(2)O(2) induces smooth muscle cell (SMC) hypertrophy by a mechanism involving Aqp1, Nox1, and Ask1. METHODS AND RESULTS Treatment of rat aortic SMCs (rASMC) with exogenous H(2)O(2) resulted in a concentration-dependent increase in Nox-derived superoxide (O(2)(•-)), determined by L-012 chemiluminescence, cytochrome c and electron paramagnetic resonance. Nox1 was verified as the source of O(2)(·-) by siRNA. Aqp1 siRNA attenuated H(2)O(2) cellular entry and H(2)O(2)-induced O(2)(•-) production. H(2)O(2) treatment increased Ask1 activation and induced rASMC hypertrophy in a Nox1-dependent mechanism. Adenoviral-dominant-negative Ask1 attenuated H(2)O(2)-induced rASMC hypertrophy and adenoviral overexpression of Ask1 augmented it. CONCLUSION Our results demonstrate for the first time that extracellular H(2)O(2), at pathophysiological concentrations, stimulates rASMC Nox1-derived O(2)(•-), subsequent Ask1 activation and SMC hypertrophy. The data demonstrate a novel pathway by which H(2)O(2) enters vascular cells via aquaporins and activates Nox, leading to hypertrophy, and provide multiple novel targets for combinatorial therapeutics development targeting hypertrophy and vascular disease.
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Affiliation(s)
- Imad Al Ghouleh
- Vascular Medicine Institute and Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA
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Wang M, Sheng Q, Zhang D, He Y, Zheng J. TiC nanoparticles-chitosan composite film for the direct electron transfer of myoglobin and its application in biosensing. Bioelectrochemistry 2012; 86:46-53. [DOI: 10.1016/j.bioelechem.2012.01.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2011] [Revised: 01/15/2012] [Accepted: 01/21/2012] [Indexed: 10/14/2022]
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Theoretical study on the hydration of hydrogen peroxide in terms of ab initio method and atom-bond electronegativity equalization method fused into molecular mechanics. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s11458-011-0259-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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37
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Theoretical study of hydrogen peroxide interacting with DNA base and DNA base pair in terms of ab initio method and ABEEMσπ/MM fluctuating charge potential model. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.03.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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38
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Yu CY, Yang ZZ. A Systemic Investigation of Hydrogen Peroxide Clusters (H2O2)n (n = 1−6) and Liquid-State Hydrogen Peroxide: Based on Atom-Bond Electronegativity Equalization Method Fused into Molecular Mechanics and Molecular Dynamics. J Phys Chem A 2011; 115:2615-26. [DOI: 10.1021/jp111284t] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chun-Yang Yu
- Chemistry and Chemical Engineering Faculty, Liaoning Normal University, Dalian 116029, China
| | - Zhong-Zhi Yang
- Chemistry and Chemical Engineering Faculty, Liaoning Normal University, Dalian 116029, China
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Leblanc S, Ouellet A, Giguère Y, Forest JC, Moutquin JM, Aris A. A Positive Correlation between Hydrogen Peroxide and Soluble TNF-Alpha Receptor 2 Early in Maternal Blood and At Term in Placenta of Pregnant Women with Preeclampsia. Hypertens Pregnancy 2010; 31:357-66. [DOI: 10.3109/10641955.2010.525281] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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40
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Unprecedented Peroxidase-like Activity of Rhodnius prolixus Nitrophorin 2: Identification of the [FeIV═O Por•]+ and [FeIV═O Por](Tyr38•) Intermediates and Their Role(s) in Substrate Oxidation. Biochemistry 2010; 49:8857-72. [DOI: 10.1021/bi100499a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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41
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Effects of nitrite on modulating ROS generation following ischemia and reperfusion. Adv Drug Deliv Rev 2009; 61:339-50. [PMID: 19385092 DOI: 10.1016/j.addr.2009.02.002] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
It has long been known that the generation of reactive oxygen species (ROS) is a major cause of injury after ischemia/reperfusion. More recently it has emerged that the predominant source of these ROS are the mitochondria, which are specifically damaged during prolonged ischemic episodes. Several strategies have been tested to attenuate mitochondrial damage and reperfusion ROS. Most successful has been ischemic preconditioning, a procedure in which repetitive short periods of ischemia and reperfusion reduce injury from a subsequent prolonged ischemia and reperfusion. Recently, ischemic postconditioning, whereby reperfusion after prolonged ischemia is repetitively interrupted for a short period, has also been shown to equally protect as ischemic preconditioning. Both procedures activate the same down-stream kinase pathways that minimize apoptosis and tissue damage. Endothelial nitric oxide synthase is a target of these kinase pathways and nitric oxide (NO) administration can mimic its protective effect. However, the optimal NO dose is difficult to determine and excess NO levels have been shown to be detrimental. A recently described physiological storage pool of NO, nitrite, has been shown to be a potent mediator of cytoprotection after ischemia/reperfusion that mechanistically reduces mitochondrial ROS generation at reperfusion. Here, we describe the sources, bioactivaton, and mechanisms of action of nitrite and discuss the potential of this simple anion as a therapeutic to protect against ischemia/reperfusion injury.
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Aris A, Benali S, Ouellet A, Moutquin JM, Leblanc S. Potential biomarkers of preeclampsia: inverse correlation between hydrogen peroxide and nitric oxide early in maternal circulation and at term in placenta of women with preeclampsia. Placenta 2009; 30:342-7. [PMID: 19223072 DOI: 10.1016/j.placenta.2009.01.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Revised: 01/12/2009] [Accepted: 01/12/2009] [Indexed: 12/01/2022]
Abstract
Preeclampsia (PE) is a pregnancy-specific disease that has been associated with future cardiovascular disease for the mother and her child. The etiology of PE is unclear but oxidative stress seems to play a major role in endothelial dysfunction and permanent systemic vasoconstriction shown in PE. Hydrogen peroxide (H(2)O(2)), a terminal metabolite of the cellular oxidative stress cascade, is also revealed as a component of oxidative ischemia/reperfusion stress in placenta. We were the first to show an increase in the levels of H(2)O(2) in the serum of preeclamptic women at term. H(2)O(2) is already known to reduce the production of NO by increasing the metabolism of arginases. The objective of this study was to investigate a possible correlation between nitric oxide (NO), a potent vasodilator, and H(2)O(2) throughout pregnancy. Thus, we simultaneously assessed the levels of NO and H(2)O(2) in the serum of normal and preeclamptic women at 10-15 and 37-40 weeks of pregnancy, and in placentas at delivery. Our findings showed an inverse correlation between increased levels of H(2)O(2) and decreased levels of NO early in maternal circulation and at term in placenta. This relationship is confirmed by our in vitro experiments which demonstrate that H(2)O(2) inhibits NO synthesis of cytotrophoblasts. In conclusion, our findings highlight an inverse correlation between H(2)O(2) and NO early in maternal circulation and in placenta of women with preeclampsia, paving the way for further studies examining the potential use of NO and H(2)O(2) as biomarkers in the prediction of preeclampsia.
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Affiliation(s)
- A Aris
- Department of Obstetrics-Gynecology, University of Sherbrooke Hospital Centre, Quebec J1H 5N4, Canada.
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The peptidoglycan-associated lipoprotein OprL helps protect a Pseudomonas aeruginosa mutant devoid of the transactivator OxyR from hydrogen peroxide-mediated killing during planktonic and biofilm culture. J Bacteriol 2008; 190:3658-69. [PMID: 18310335 DOI: 10.1128/jb.00022-08] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
OxyR controls H(2)O(2)-dependent gene expression in Pseudomonas aeruginosa. Without OxyR, diluted (<10(7)/ml) organisms are easily killed by micromolar H(2)O(2). The goal of this study was to define proteins that contribute to oxyR mutant survival in the presence of H(2)O(2). We identified proteins in an oxyR mutant that were oxidized by using 2,4-dinitrophenylhydrazine for protein carbonyl detection, followed by identification using a two-dimensional gel/matrix-assisted laser desorption ionization-time of flight approach. Among these was the peptidoglycan-associated lipoprotein, OprL. A double oxyR oprL mutant was constructed and was found to be more sensitive to H(2)O(2) than the oxyR mutant. Provision of the OxyR-regulated alkyl hydroperoxide reductase, AhpCF, but not AhpB or the catalase, KatB, helped protect this strain against H(2)O(2). Given the sensitivity of oxyR oprL bacteria to planktonic H(2)O(2), we next tested the hypothesis that the biofilm mode of growth might protect such organisms from H(2)O(2)-mediated killing. Surprisingly, biofilm-grown oxyR oprL mutants, which (in contrast to planktonic cells) possessed no differences in catalase activity compared to the oxyR mutant, were sensitive to killing by as little as 0.5 mM H(2)O(2). Transmission electron microscopy studies revealed that the integrity of both cytoplasmic and outer membranes of oxyR and oxyR oprL mutants were compromised. These studies suggest that sensitivity to the important physiological oxidant H(2)O(2) in the exquisitely sensitive oxyR mutant bacteria is based not only upon the presence and location of OxyR-controlled antioxidant enzymes such as AhpCF but also on structural reinforcement by the peptidoglycan-associated lipoprotein OprL, especially during growth in biofilms.
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Waugh WH. Inhibition of Iron-Catalyzed Oxidations by Attainable Uric Acid and Ascorbic Acid Levels: Therapeutic Implications for Alzheimer’s Disease and Late Cognitive Impairment. Gerontology 2008; 54:238-43. [DOI: 10.1159/000122618] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2007] [Accepted: 02/13/2008] [Indexed: 02/04/2023] Open
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Thengchaisri N, Hein TW, Wang W, Xu X, Li Z, Fossum TW, Kuo L. Upregulation of arginase by H2O2 impairs endothelium-dependent nitric oxide-mediated dilation of coronary arterioles. Arterioscler Thromb Vasc Biol 2006; 26:2035-42. [PMID: 16794224 DOI: 10.1161/01.atv.0000233334.24805.62] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Overproduction of reactive oxygen species such as hydrogen peroxide (H2O2) has been implicated in various cardiovascular diseases. However, mechanism(s) underlying coronary vascular dysfunction induced by H2O2 is unclear. We studied the effect of H2O2 on dilation of coronary arterioles to endothelium-dependent and endothelium-independent agonists. METHODS AND RESULTS Porcine coronary arterioles were isolated and pressurized without flow for in vitro study. All vessels developed basal tone and dilated dose-dependently to activators of nitric oxide (NO) synthase (adenosine and ionomycin), cyclooxygenase (arachidonic acid), and cytochrome P450 monooxygenase (bradykinin). Intraluminal incubation of vessels with H2O2 (100 micromol/L, 60 minutes) did not alter basal tone but inhibited vasodilations to adenosine and ionomycin in a manner similar as that by NO synthase inhibitor L-NAME. H2O2 affected neither endothelium-dependent responses to arachidonic acid and bradykinin nor endothelium-independent dilation to sodium nitroprusside. The inhibited adenosine response was not reversed by removal of H2O2 but was restored by excess L-arginine. Inhibition of L-arginine consuming enzyme arginase by alpha-difluoromethylornithine or N(omega)-hydroxy-nor-L-arginine also restored vasodilation. Administering deferoxamine, an inhibitor of hydroxyl radical production, prevented the H2O2-induced impairment of vasodilation to adenosine. Western blot and reverse-transcription polymerase chain reaction results indicated that arginase I was upregulated after treating vessels with H2O2. CONCLUSIONS H2O2 specifically impairs endothelium-dependent NO-mediated dilation of coronary microvessels by reducing L-arginine availability through upregulation of arginase. The formation of hydroxyl radicals from H2O2 may contribute to this process.
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Affiliation(s)
- Naris Thengchaisri
- Department of Systems Biology and Translational Medicine, Cardiovascular Research Institute, Texas A&M University System Health Science Center, Temple, TX 76502, USA
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Pryor WA, Houk KN, Foote CS, Fukuto JM, Ignarro LJ, Squadrito GL, Davies KJA. Free radical biology and medicine: it's a gas, man! Am J Physiol Regul Integr Comp Physiol 2006; 291:R491-511. [PMID: 16627692 DOI: 10.1152/ajpregu.00614.2005] [Citation(s) in RCA: 324] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We review gases that can affect oxidative stress and that themselves may be radicals. We discuss O(2) toxicity, invoking superoxide, hydrogen peroxide, and the hydroxyl radical. We also discuss superoxide dismutase (SOD) and both ground-state, triplet oxygen ((3)O(2)), and the more energetic, reactive singlet oxygen ((1)O(2)). Nitric oxide ((*)NO) is a free radical with cell signaling functions. Besides its role as a vasorelaxant, (*)NO and related species have other functions. Other endogenously produced gases include carbon monoxide (CO), carbon dioxide (CO(2)), and hydrogen sulfide (H(2)S). Like (*)NO, these species impact free radical biochemistry. The coordinated regulation of these species suggests that they all are used in cell signaling. Nitric oxide, nitrogen dioxide, and the carbonate radical (CO(3)(*-)) react selectively at moderate rates with nonradicals, but react fast with a second radical. These reactions establish "cross talk" between reactive oxygen (ROS) and reactive nitrogen species (RNS). Some of these species can react to produce nitrated proteins and nitrolipids. It has been suggested that ozone is formed in vivo. However, the biomarkers that were used to probe for ozone reactions may be formed by non-ozone-dependent reactions. We discuss this fascinating problem in the section on ozone. Very low levels of ROS or RNS may be mitogenic, but very high levels cause an oxidative stress that can result in growth arrest (transient or permanent), apoptosis, or necrosis. Between these extremes, many of the gasses discussed in this review will induce transient adaptive responses in gene expression that enable cells and tissues to survive. Such adaptive mechanisms are thought to be of evolutionary importance.
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Affiliation(s)
- William A Pryor
- Biodynamics Institute, Louisiana State University, Baton Rouge, LA 70803, USA.
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Affiliation(s)
- Shan Xi Tian
- Hefei National Laboratory of Physical Sciences at Microscale, Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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Redondo PC, Salido GM, Pariente JA, Rosado JA. Dual effect of hydrogen peroxide on store-mediated calcium entry in human platelets. Biochem Pharmacol 2004; 67:1065-76. [PMID: 15006543 DOI: 10.1016/j.bcp.2003.10.028] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2003] [Accepted: 10/29/2003] [Indexed: 11/17/2022]
Abstract
Redox regulation is important for the modulation of cytosolic Ca(2+) concentration. Hence, we have investigated the effect of H(2)O(2) on store-mediated Ca(2+) entry (SMCE). In fura-2-loaded human platelets treatment with H(2)O(2) resulted in a concentration-dependent increase in Ca(2+) release from intracellular stores, while the effect on Ca(2+) entry was biphasic. In addition, 1mM H(2)O(2) reduced SMCE induced by agonists. The inhibitory effect of 1mM H(2)O(2) was prevented by inhibition of actin polymerization with cytochalasin D. Consistent with this, we found that 10microM H(2)O(2) and store depletion by treatment with thapsigargin plus ionomycin induced a similar temporal sequence of actin reorganization, while exposure to 1mM H(2)O(2) shifted the dynamics between polymerization and depolymerization in favor of the former. One millimolar H(2)O(2)-induced polymerization was reduced by treatment with methyl 2,5-dihydroxycinnamate and farnesylthioacetic acid, inhibitors of tyrosine kinases and Ras superfamily proteins, respectively. Finally, exposure to 1mM H(2)O(2) significantly increased store depletion-induced p60(src) activation. We conclude that H(2)O(2) exerted a biphasic effect on SMCE. The inhibitory role of high H(2)O(2) concentrations is mediated by an abnormal actin reorganization pattern involving both Ras- and tyrosine kinases-dependent pathways.
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Affiliation(s)
- Pedro C Redondo
- Department of Physiology, Faculty of Veterinary Sciences, University of Extremadura, 10071 Cáceres, Spain.
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Vidrio H, Medina M, González-Romo P, Lorenzana-Jiménez M, Díaz-Arista P, Baeza A. Semicarbazide-sensitive amine oxidase substrates potentiate hydralazine hypotension: possible role of hydrogen peroxide. J Pharmacol Exp Ther 2003; 307:497-504. [PMID: 12970383 DOI: 10.1124/jpet.103.055350] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The relation between inhibition of semicarbazide-sensitive amine oxidase (SSAO) and vasodilation by hydralazine (HYD) was evaluated in chloralose/urethane-anesthetized rats pretreated with various substrates of the enzyme and subsequently administered a threshold hypotensive dose of the vasodilator. The SSAO substrates benzylamine, phenethylamine, and methylamine potentiate the hypotensive response to HYD. Methylamine, which was studied in greater detail because of its status as a possible endogenous SSAO substrate, does not influence the response to the reference vasodilator pinacidil; it does enhance HYD relaxation in aortic rings obtained from pretreated rats. Experiments designed to identify the product of SSAO activity responsible for potentiation by methylamine suggest involvement of hydrogen peroxide (H2O2), as evidenced by the findings that such potentiation is abolished by additional pretreatment with the H2O2-metabolizing enzyme catalase, and that the plasma concentration of H2O2 is increased by methylamine and decreased by HYD. These results are interpreted as a substantiation of the relation between the known SSAO inhibitory effect of HYD and its vasodilator activity. Pretreatment with the SSAO substrates would increase production of H2O2 in vascular smooth muscle and thus magnify the influence of this vasoconstrictor agent on vascular tone. In these conditions, the decrease in H2O2 production and hence in vascular tone caused by SSAO inhibition by HYD would also be magnified. It is speculated that inhibition of vascular SSAO could represent a novel mechanism of vasodilation.
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Affiliation(s)
- Horacio Vidrio
- Department of Pharmacology, Faculty of Medicine, Universidad Nacional Autonoma de Mexico, Apartado Postal 70297, 04510 Mexico, D.F., Mexico.
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Abstract
Hydrogen peroxide (H(2)O(2)) is widely regarded as a cytotoxic agent whose levels must be minimized by the action of antioxidant defence enzymes. In fact, H(2)O(2) is poorly reactive in the absence of transition metal ions. Exposure of certain human tissues to H(2)O(2) may be greater than is commonly supposed: substantial amounts of H(2)O(2) can be present in beverages commonly drunk (especially instant coffee), in freshly voided human urine, and in exhaled air. Levels of H(2)O(2) in the human body may be controlled not only by catabolism but also by excretion, and H(2)O(2) could play a role in the regulation of renal function and as an antibacterial agent in the urine. Urinary H(2)O(2) levels are influenced by diet, but under certain conditions might be a valuable biomarker of 'oxidative stress'.
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Affiliation(s)
- B Halliwell
- Department of Biochemistry, Faculty of Medicine, National University of Singapore.
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