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Mouithys-Mickalad A, Etsè KS, Franck T, Ceusters J, Niesten A, Graide H, Deby-Dupont G, Sandersen C, Serteyn D. Free Radical Inhibition Using a Water-Soluble Curcumin Complex, NDS27: Mechanism Study Using EPR, Chemiluminescence, and Docking. Antioxidants (Basel) 2024; 13:80. [PMID: 38247504 PMCID: PMC10812671 DOI: 10.3390/antiox13010080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/23/2023] [Accepted: 12/31/2023] [Indexed: 01/23/2024] Open
Abstract
There is a growing interest in the use of natural compounds to tackle inflammatory diseases and cancers. However, most of them face the bioavailability and solubility challenges to reaching cellular compartments and exert their potential biological effects. Polyphenols belong to that class of molecules, and numerous efforts have been made to improve and overcome these problems. Curcumin is widely studied for its antioxidant and anti-inflammatory properties as well as its use as an anticancer agent. However, its poor solubility and bioavailability are often a source of concern with disappointing or unexpected results in cellular models or in vivo, which limits the clinical use of curcumin as such. Beside nanoparticles and liposomes, cyclodextrins are one of the best candidates to improve the solubility of these molecules. We have used lysine and cyclodextrin to form a water-soluble curcumin complex, named NDS27, in which potential anti-inflammatory effects were demonstrated in cellular and in vivo models. Herein, we investigated for the first time its direct free radicals scavenging activity on DPPH/ABTS assays as well as on hydroxyl, superoxide anion, and peroxyl radical species. The ability of NDS27 to quench singlet oxygen, produced by rose bengal photosensitization, was studied, as was the inhibiting effect on the enzyme-catalyzed oxidation of the co-substrate, luminol analog (L012), using horseradish peroxidase (HRP)/hydrogen peroxide (H2O2) system. Finally, docking was performed to study the behavior of NDS27 in the active site of the peroxidase enzyme.
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Affiliation(s)
- Ange Mouithys-Mickalad
- Centre for Oxygen R&D (CORD)-CIRM, Institute of Chemistry, University of Liège, Allée de la Chimie, 3, 4000 Liège, Belgium; (T.F.); (J.C.); (A.N.); (G.D.-D.); (D.S.)
| | - Koffi Senam Etsè
- Laboratory of Medicinal Analytic (CIRM), University of Liège, Hospital Quarter, 15 Hospital Avenue, 4000 Liège, Belgium;
| | - Thierry Franck
- Centre for Oxygen R&D (CORD)-CIRM, Institute of Chemistry, University of Liège, Allée de la Chimie, 3, 4000 Liège, Belgium; (T.F.); (J.C.); (A.N.); (G.D.-D.); (D.S.)
- Veterinary Clinic, Large Animal Surgery, B32, Boulevard du Rectorat, 4000 Liège, Belgium;
| | - Justine Ceusters
- Centre for Oxygen R&D (CORD)-CIRM, Institute of Chemistry, University of Liège, Allée de la Chimie, 3, 4000 Liège, Belgium; (T.F.); (J.C.); (A.N.); (G.D.-D.); (D.S.)
| | - Ariane Niesten
- Centre for Oxygen R&D (CORD)-CIRM, Institute of Chemistry, University of Liège, Allée de la Chimie, 3, 4000 Liège, Belgium; (T.F.); (J.C.); (A.N.); (G.D.-D.); (D.S.)
| | - Hélène Graide
- Centre for Oxygen R&D (CORD)-CIRM, Institute of Chemistry, University of Liège, Allée de la Chimie, 3, 4000 Liège, Belgium; (T.F.); (J.C.); (A.N.); (G.D.-D.); (D.S.)
| | - Ginette Deby-Dupont
- Centre for Oxygen R&D (CORD)-CIRM, Institute of Chemistry, University of Liège, Allée de la Chimie, 3, 4000 Liège, Belgium; (T.F.); (J.C.); (A.N.); (G.D.-D.); (D.S.)
| | - Charlotte Sandersen
- Veterinary Clinic, Large Animal Surgery, B32, Boulevard du Rectorat, 4000 Liège, Belgium;
| | - Didier Serteyn
- Centre for Oxygen R&D (CORD)-CIRM, Institute of Chemistry, University of Liège, Allée de la Chimie, 3, 4000 Liège, Belgium; (T.F.); (J.C.); (A.N.); (G.D.-D.); (D.S.)
- Veterinary Clinic, Large Animal Surgery, B32, Boulevard du Rectorat, 4000 Liège, Belgium;
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Fatima K, Masood N, Luqman S. Quenching of singlet oxygen by natural and synthetic antioxidants and assessment of electronic UV/Visible absorption spectra for alleviating or enhancing the efficacy of photodynamic therapy. BIOMEDICAL RESEARCH AND THERAPY 2016. [DOI: 10.7603/s40730-016-0008-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Fabbri D, Minella M, Maurino V, Minero C, Vione D. A model assessment of the importance of direct photolysis in the photo-fate of cephalosporins in surface waters: Possible formation of toxic intermediates. CHEMOSPHERE 2015; 134:452-458. [PMID: 26001938 DOI: 10.1016/j.chemosphere.2015.04.102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 04/28/2015] [Accepted: 04/29/2015] [Indexed: 06/04/2023]
Abstract
The direct and indirect photodegradation of six cephalosporins was predicted using a photochemical model, on the basis of literature values of photochemical reactivity. Environmental photodegradation would be important in surface water bodies with depth ⩽ 2-3m, and/or in deeper waters with low values of the dissolved organic carbon (DOC ⩽ 1 mg C L(-1)). The half-life times would range from a few days to a couple of weeks in summertime. In deeper and higher-DOC waters and/or in different seasons, hydrolysis could prevail over photodegradation. The direct photolysis of cephalosporins is environmentally concerning because it is known to produce toxic intermediates. It would be a major pathway for cefazolin, an important one for amoxicillin and cefotaxime and, at pH<6.5, for cefapirin as well. In contrast, direct photolysis would be negligible for cefradine and cefalexin. The DOC values would influence the fraction of photodegradation accounted for by direct photolysis in shallow water, to a different extent depending on the role of sensitisation by the triplet states of chromophoric dissolved organic matter.
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Affiliation(s)
- Debora Fabbri
- Department of Chemistry, University of Torino, via P. Giuria 5, 10125 Torino, Italy
| | - Marco Minella
- Department of Chemistry, University of Torino, via P. Giuria 5, 10125 Torino, Italy
| | - Valter Maurino
- Department of Chemistry, University of Torino, via P. Giuria 5, 10125 Torino, Italy
| | - Claudio Minero
- Department of Chemistry, University of Torino, via P. Giuria 5, 10125 Torino, Italy
| | - Davide Vione
- Department of Chemistry, University of Torino, via P. Giuria 5, 10125 Torino, Italy.
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Gangopadhyay M, Mukhopadhyay SK, Karthik S, Barman S, Pradeep Singh ND. Targeted photoresponsive TiO2–coumarin nanoconjugate for efficient combination therapy in MDA-MB-231 breast cancer cells: synergic effect of photodynamic therapy (PDT) and anticancer drug chlorambucil. MEDCHEMCOMM 2015. [DOI: 10.1039/c4md00481g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We have developed for the first time an excellent targeted metallic single component nanoparticle system for combination of PDT and chemotherapy.
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Affiliation(s)
| | | | - S. Karthik
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Shrabani Barman
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
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Tarinc D, Dogan-Topal B, Golcu A, Ozkan SA. Electrochemical investigation and determination of ceftazidime in pharmaceutical dosage forms and human urine. JOURNAL OF ANALYTICAL CHEMISTRY 2014. [DOI: 10.1134/s1061934814090056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lee JK, Ko SH, Ye SK, Chung MH. 8-Oxo-2′-deoxyguanosine ameliorates UVB-induced skin damage in hairless mice by scavenging reactive oxygen species and inhibiting MMP expression. J Dermatol Sci 2013; 70:49-57. [DOI: 10.1016/j.jdermsci.2013.01.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 01/21/2013] [Accepted: 01/28/2013] [Indexed: 01/21/2023]
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Chowdhury N, Dasgupta S, Pradeep Singh N. Photoinduced DNA cleavage by anthracene based hydroxamic acids. Bioorg Med Chem Lett 2012; 22:4668-71. [DOI: 10.1016/j.bmcl.2012.05.084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 04/23/2012] [Accepted: 05/23/2012] [Indexed: 10/28/2022]
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Liu X, Gai Z, Tao F, Tang H, Xu P. Carotenoids play a positive role in the degradation of heterocycles by Sphingobium yanoikuyae. PLoS One 2012; 7:e39522. [PMID: 22745775 PMCID: PMC3380023 DOI: 10.1371/journal.pone.0039522] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 05/22/2012] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Microbial oxidative degradation is a potential way of removing pollutants such as heterocycles from the environment. During this process, reactive oxygen species or other oxidants are inevitably produced, and may cause damage to DNA, proteins, and membranes, thereby decreasing the degradation rate. Carotenoids can serve as membrane-integrated antioxidants, protecting cells from oxidative stress. FINDINGS Several genes involved in the carotenoid biosynthetic pathway were cloned and characterized from a carbazole-degrading bacterium Sphingobium yanoikuyae XLDN2-5. In addition, a yellow-pigmented carotenoid synthesized by strain XLDN2-5 was identified as zeaxanthin that was synthesized from β-carotene through β-cryptoxanthin. The amounts of zeaxanthin and hydrogen peroxide produced were significantly and simultaneously enhanced during the biodegradation of heterocycles (carbazole < carbazole + benzothiophene < carbazole + dibenzothiophene). These higher production levels were consistent with the transcriptional increase of the gene encoding phytoene desaturase, one of the key enzymes for carotenoid biosynthesis. CONCLUSIONS/SIGNIFICANCE Sphingobium yanoikuyae XLDN2-5 can enhance the synthesis of zeaxanthin, one of the carotenoids, which may modulate membrane fluidity and defense against intracellular oxidative stress. To our knowledge, this is the first report on the positive role of carotenoids in the biodegradation of heterocycles, while elucidating the carotenoid biosynthetic pathway in the Sphingobium genus.
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Affiliation(s)
- Xiaorui Liu
- State Key Laboratory of Microbial Metabolism & School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, People′s Republic of China
| | - Zhonghui Gai
- State Key Laboratory of Microbial Metabolism & School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, People′s Republic of China
| | - Fei Tao
- State Key Laboratory of Microbial Metabolism & School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, People′s Republic of China
| | - Hongzhi Tang
- State Key Laboratory of Microbial Metabolism & School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, People′s Republic of China
| | - Ping Xu
- State Key Laboratory of Microbial Metabolism & School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, People′s Republic of China
- * E-mail:
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Wu YY, Li W, Xu Y, Jin EH, Tu YY. Evaluation of the antioxidant effects of four main theaflavin derivatives through chemiluminescence and DNA damage analyses. J Zhejiang Univ Sci B 2012; 12:744-51. [PMID: 21887850 DOI: 10.1631/jzus.b1100041] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Theaflavins (TFs) are the dimers of a couple of epimerized catechins, which are specially formed during black tea fermentation. To explore the differences among four main TF derivatives (theaflavin (TF(1)), theaflavin-3-gallate (TF(2)A), theaflavin-3'-gallate (TF(2)B), and theaflavin-3,3'-digallate (TF(3))) in scavenging reactive oxygen species (ROS) in vitro, their properties of inhibiting superoxide, singlet oxygen, hydrogen peroxide, and the hydroxyl radical, and their effects on hydroxyl radical-induced DNA oxidative damage were systematically analyzed in the present study. The results show that, compared with (-)-epigallocatechin gallate (EGCG), TF derivatives were good antioxidants for scavenging ROS and preventing the hydroxyl radical-induced DNA damage in vitro. TF(3) was the most positive in scavenging hydrogen peroxide and hydroxyl radical, and TF(1) suppressed superoxide. Positive antioxidant capacities of TF(2)B on singlet oxygen, hydrogen peroxide, hydroxyl radical, and the hydroxyl radical-induced DNA damage in vitro were found. The differences between the antioxidant capacities of four main TF derivatives in relation to their chemical structures were also discussed. We suggest that these activity differences among TF derivatives would be beneficial to scavenge different ROS with therapeutic potential.
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Affiliation(s)
- Yuan-yuan Wu
- Department of Tea Science, Zhejiang University, Hangzhou, China
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Tian B, Sun Z, Xu Z, Shen S, Wang H, Hua Y. Carotenoid 3′,4′-desaturase is involved in carotenoid biosynthesis in the radioresistant bacterium Deinococcus radiodurans. Microbiology (Reading) 2008; 154:3697-3706. [DOI: 10.1099/mic.0.2008/021071-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Bing Tian
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Zongtao Sun
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Zhenjian Xu
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Shaochuan Shen
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Hu Wang
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
| | - Yuejin Hua
- Key Laboratory for Nuclear-Agricultural Sciences of Chinese Ministry of Agriculture and Zhejiang Province, Institute of Nuclear-Agricultural Sciences, Zhejiang University, 310029 Hangzhou, PR China
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Duez JM, Péchinot A, Neuwirth C. [Modulatory effect of antimicrobial agents or aminoacids on the oxidative burst of polymorphonuclear neutrophils triggered by formylmethionyl-leucyl-phenylalanine (fMLP)]. ACTA ACUST UNITED AC 2005; 54:37-43. [PMID: 16376177 DOI: 10.1016/j.patbio.2004.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2004] [Accepted: 10/25/2004] [Indexed: 11/18/2022]
Abstract
We have compared the interplay of several antimicrobial agents and aminoacids on the neutrophil respiratory burst in response to formylmethionyl-leucyl-phenylalanine (fMLP), a chemoattractant. Mainly, an inhibitory effect has been observed in the penicillin family of agents and an enhancing effect in the cephalosporin family of agents. The molecules in which the sulfur numbered 1 in the 6-APA or 7-ACA nucleus was replaced by a carbon or an oxygen, had a different effect as compared with the other members of the family. The modulatory effects of ampicillin and cephalothine were not significant at a concentration lower than 10 mg/l and the effect of cephalothine looked maximum at 20-40 mg/l. If studies in cell-free systems demonstrated that the inhibitory effect of some antimicrobials could be due to a direct oxidant-scavenger activity mainly of HOCl, only hypotheses are proposed to explain the enhancing activity of the others. It could be in relation with (i) a synergistic effect upon fMLP receptor leading to an increase in H(2)O(2)/HOCl production or (ii) the generation of new oxydant products originating in cephalosporin lysis under HOCl attack, which would be able to react with luminol. The interplay of antimicrobial agents with the respiratory burst measured outside the cells probably has no therapeutic consequences because the bactericidal activity of neutrophils is achieved inside phagosomes where few agents are known to come into and where chemical conditions are different. On the opposite, in clinical use, this interplay could be interesting to study for a prevention of side effects.
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Affiliation(s)
- J-M Duez
- Laboratoire de bactériologie, CHU de Dijon 2, boulevard Mal-de-Lattre-de-Tassigny, BP 77908, 21079 Dijon cedex, France.
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Kim JE, Choi S, Yoo JA, Chung MH. 8-Oxoguanine induces intramolecular DNA damage but free 8-oxoguanine protects intermolecular DNA from oxidative stress. FEBS Lett 2004; 556:104-10. [PMID: 14706835 DOI: 10.1016/s0014-5793(03)01385-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
7,8-Dihydro-8-oxoguanine (8-oxoguanine; 8-oxo-G), one of the major oxidative DNA adducts, is highly susceptible to further oxidation by radicals. We confirmed the higher reactivity of 8-oxo-G toward reactive oxygen (singlet oxygen and hydroxyl radical) or nitrogen (peroxynitrite) species as compared to unmodified base. In this study, we raised the question about the effect of this high reactivity toward radicals on intramolecular and intermolecular DNA damage. We found that the amount of intact nucleoside in oligodeoxynucleotide containing 8-oxo-G decreased more by various radicals at higher levels of 8-oxo-G incorporation, and that the oligodeoxynucleotide damage and plasmid cleavage by hydroxyl radical were inhibited in the presence of 7,8-dihydro-8-oxo-2'-deoxyguanosine (8-oxo-dG). We conclude that 8-oxo-G within DNA induces intramolecular DNA base damage, but that free 8-oxo-G protects intermolecular DNA from oxidative stress. These results suggest that 8-oxo-G within DNA must be rapidly released to protect DNA from overall oxidative damage.
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Affiliation(s)
- Ja-Eun Kim
- Department of Pharmacology, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, 110-799, Seoul, South Korea
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Goscinski G, Lipcsey M, Eriksson M, Larsson A, Tano E, Sjölin J. Endotoxin neutralization and anti-inflammatory effects of tobramycin and ceftazidime in porcine endotoxin shock. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2003; 8:R35-41. [PMID: 14975053 PMCID: PMC420063 DOI: 10.1186/cc2415] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2003] [Revised: 11/07/2003] [Accepted: 11/25/2003] [Indexed: 11/10/2022]
Abstract
Introduction Antibiotics used for treatment of severe bacterial infections have been shown to exert effects on the inflammatory response in addition to their antibacterial effects. The aim of the present study was to investigate whether the biological effects of endotoxin in a porcine model could be neutralized by tobramycin, and whether tobramycin or ceftazidime was able to modulate the inflammatory response. Method Thirteen piglets were subjected to endotoxin infusion at an initial rate of 4 μg/kg per hour, which was reduced to 1 μg/kg per hour after 30 min. Before endotoxin infusion, the animals received saline (n = 4), ceftazidime (n = 5), or tobramycin (n = 4) at clinically relevant doses. Physiological parameters were measured and blood samples were taken hourly for 6 hours for analysis of tumour necrosis factor-α, IL-6 and endotoxin concentrations. Results All of the animals exhibited physiological signs of severe sepsis without major differences between the groups. Plasma endotoxin concentration was stable after 1 hour. There were no differences in endotoxin concentration or initial tumour necrosis factor-α and IL-6 concentrations between the groups. At 6 hours the IL-6 concentration was significantly lower in the ceftazidime group than in the saline group (P < 0.05), and in both the ceftazidime and the tobramycin groups there were significantly greater reductions from peak values (P < 0.05). Conclusion There was no neutralization of the biological effects of endotoxin in this porcine model. However, our data indicate a possible anti-inflammatory effect exerted by both ceftazidime and tobramycin, which manifested as a significantly greater reduction in IL-6 in comparison with the untreated group.
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Affiliation(s)
- Gunilla Goscinski
- Section of Infectious Diseases, Department of Medical Sciences, Uppsala University Hospital, Uppsala, Sweden.
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Mouithys-Mickalad A, Mathy-Hartert M, Du G, Sluse F, Deby C, Lamy M, Deby-Dupont G. Oxygen consumption and electron spin resonance studies of free radical production by alveolar cells exposed to anoxia: inhibiting effects of the antibiotic ceftazidime. Redox Rep 2003; 7:85-94. [PMID: 12189054 DOI: 10.1179/135100002125000316] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
By EPR spectroscopy, we investigated free radical production by cultured human alveolar cells subjected to anoxia/re-oxygenation (A/R), and tested the effects of ceftazidime, an antibiotic previously demonstrated to possess antioxidant properties. Two A/R models were performed on type II pneumocytes (A549 cell line), either on cells attached to culture dishes (monolayer A/R model; 3.5 h of anoxia, 30 min of re-oxygenation) or after cell detachment (suspension A/R model; 1 h of anoxia, 10 min of re-oxygenation). Ceftazidime and selective inhibitors (SOD, Tiron, L-NMMA) were added before anoxia. Free radical production was assessed by the EPR spin trapping technique. Oxygen consumption was monitored, in parallel with EPR studies, in the suspension A/R model. The production of free radical species was demonstrated by the generation of PBN-radical adducts: (a(N) = 15.2 G) in the monolayer A/R model and a six-line EPR spectrum (a(N) = 15.7 G and a(H) = 2.7 G) in the suspension A/R model. A kinetic study performed by oximetry, in parallel with EPR spectroscopy, demonstrated marked alterations of the cell respiratory function and that the free radical production started during anoxia and increased during re-oxygenation. In the suspension A/R model, the amplitude of EPR spectra were decreased upon the addition of 200 U/ml SOD (37% inhibition), 0.1 mM Tiron (67% inhibition) and 1 mM L-NMMA (43% inhibition). Addition of 1 mM ceftazidime decreased the amplitude of EPR spectra (37% inhibition) in both A/R models. Complementary in vitro EPR studies demonstrated that CAZ scavenged the hydroxyl radical (produced by the Fenton reaction). The protective effect of ceftazidime in the cell model could thus be linked to its ability to scavenge superoxide anions, nitrogen-derived species and hydroxyl radicals.
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Affiliation(s)
- Ange Mouithys-Mickalad
- Centre for Oxygen Research and Development, Institut de Chimie, B6a, Domaine Universitaire du Sart Tilman, 4000 Liège, Belgium.
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Daumer KM, Khan AU, Steinbeck MJ. Chlorination of pyridinium compounds. Possible role of hypochlorite, N-chloramines, and chlorine in the oxidation of pyridinoline cross-links of articular cartilage collagen type II during acute inflammation. J Biol Chem 2000; 275:34681-92. [PMID: 10940296 PMCID: PMC2941819 DOI: 10.1074/jbc.m002003200] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Reactive oxygen species produced by activated neutrophils and monocytes are thought to be involved in mediating the loss of collagen and other matrix proteins at sites of inflammation. To evaluate their potential to oxidize the pyridinoline (Pyd) cross-links found in collagen types I and II, we reacted hydrogen peroxide (H(2)O(2)), hypochlorous acid/hypochlorite (HOCl/OCl(-)), and singlet oxygen (O(2)((1)delta g)) with the Pyd substitutes, pyridoxamine dihydrochloride and vitamin B(6), which share the same chemical structure and spectral properties of Pyd cross-links. Neither H(2)O(2) (125-500 microm) nor O(2)((1)delta g) (10-25 microm) significantly changed the spectral properties of pyridoxamine or vitamin B(6). Reaction of HOCl/OCl(-) (12.5-50 microm) with pyridoxamine at pH 7.2 resulted in a concentration-dependent appearance of two new absorbance peaks and a decrease in fluorescence at 400 nm (excitation 325 nm). The new absorbance peaks correlated with the formation of an N-chloramine and the product of its subsequent reaction with pyridoxamine. In contrast, the extent to which HOCl reacted with vitamin B(6), which lacks a primary amine group, was variable at this pH. At lysosomal pH 5.5, Cl(2)/HOCl/OCl(-) reacted with both pyridoxamine and vitamin B(6). Four of the chlorinated products of this reaction were identified by gas chromatography-mass spectrometry and included 3-chloropyridinium, an aldehyde, and several chlorinated products with disrupted rings. To evaluate the effects of Cl(2)/HOCl/OCl(-) on Pyd cross-links in collagen, we exposed bone collagen type I and articular cartilage type II to HOCl. Treatment of either collagen type with HOCl at pH 5. 0 or 7.2 resulted in the oxidation of amine groups and, for collagen type II, the specific decrease in Pyd cross-link fluorescence, suggesting that during inflammation both oxidations may be used by neutrophils and monocytes to promote the loss of matrix integrity.
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Affiliation(s)
- Kathleen M. Daumer
- Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Ahsan U. Khan
- Department of Chemistry, New York University, New York, New York 10003
| | - Marla J. Steinbeck
- To whom correspondence or proofs should be addressed: Dept. of Orthopaedic Surgery, Thomas Jefferson University, 1015 Walnut St., Curtis Bldg., Rm. 324, Philadelphia, PA 19107. Tel.: 215-955-4322; Fax: 215-955-4317.
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Affiliation(s)
- S Grether-Beck
- Department of Dermatology, Heinrich-Heine-University, Düsseldorf, Germany
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