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Nyssen P, Maho A, Malempre R, Matagne A, Mouithys-Mickalad A, Hoebeke M. Propofol inhibits the myeloperoxidase activity by acting as substrate through a redox process. Biochim Biophys Acta Gen Subj 2022; 1866:130100. [PMID: 35150774 DOI: 10.1016/j.bbagen.2022.130100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 02/01/2022] [Accepted: 02/01/2022] [Indexed: 01/13/2023]
Abstract
BACKGROUND Propofol (2,6-diisopropylphenol) is frequently used as intravenous anesthetic agent, especially in its injectable form (Diprivan), to initiate and maintain sedative state during surgery or in intensive care units. Numerous studies have reported the antioxidant and anti-inflammatory effect of propofol. The oxidant enzyme myeloperoxidase (MPO), released from activated neutrophils, plays a key role in host defense. An increase of the circulating MPO concentration has been observed in patients admitted in intensive care unit and presenting a systemic inflammatory response related to septic shock or trauma. METHODS This study investigates the immunomodulatory action of propofol and Diprivan as inhibitor of the oxidant activity of MPO. The understanding of the redox action mechanism of propofol and Diprivan on the myeloperoxidase chlorination and peroxidase activities has been refined using the combination of fluorescence and absorption spectroscopies with docking and cyclic voltammetry. RESULTS Propofol acts as a reversible MPO inhibitor. The molecule interacts as a reducing substrate in the peroxidase cycle and promotes the accumulation of compound II. At acidic pH (5.5), propofol and Diprivan do not inhibit the chlorination activity, but their action increases at physiological pH (7.4). The main inhibitory action of Diprivan could be attributed to its HOCl scavenging property. GENERAL SIGNIFICANCE Propofol can act as a reversible MPO inhibitor at clinical concentrations. This property could, in addition to other previously proven anti-inflammatory actions, induce an immunomodulatory action, beneficial during clinical use, particularly in the treatment of systemic inflammation response syndrome.
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Affiliation(s)
- P Nyssen
- Biomedical Spectroscopy Laboratory, Department of Physics, CESAM, University of Liège, Building B5a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium.
| | - A Maho
- Greenmat, Department of Chemistry, CESAM, University of Liège, Building B6c, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
| | - R Malempre
- Laboratory of Enzymology and Protein folding, Centre for Protein Engineering, InBioS, University of Liège, Building B6a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
| | - A Matagne
- Laboratory of Enzymology and Protein folding, Centre for Protein Engineering, InBioS, University of Liège, Building B6a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
| | - A Mouithys-Mickalad
- CORD, Department of Chemistry, CIRM, University of Liège, Building B6a, Quartier Agora, Allée du 6 Août, 13, Sart-Tilman, 4000 Liège, Belgium
| | - M Hoebeke
- Biomedical Spectroscopy Laboratory, Department of Physics, CESAM, University of Liège, Building B5a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
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Nyssen P, Mouithys-Mickalad A, Minguet G, Sauvage E, Wouters J, Franck T, Hoebeke M. Morphine, a potential inhibitor of myeloperoxidase activity. Biochim Biophys Acta Gen Subj 2018; 1862:2236-2244. [DOI: 10.1016/j.bbagen.2018.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/05/2018] [Accepted: 07/09/2018] [Indexed: 12/22/2022]
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Quoilin C, Mouithys-Mickalad A, Lécart S, Fontaine-Aupart MP, Hoebeke M. Evidence of oxidative stress and mitochondrial respiratory chain dysfunction in an in vitro model of sepsis-induced kidney injury. Biochim Biophys Acta 2014; 1837:1790-800. [PMID: 25019585 DOI: 10.1016/j.bbabio.2014.07.005] [Citation(s) in RCA: 113] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 06/29/2014] [Accepted: 07/05/2014] [Indexed: 01/14/2023]
Abstract
To investigate the role of oxidative stress and/or mitochondrial impairment in the occurrence of acute kidney injury (AKI) during sepsis, we developed a sepsis-induced in vitro model using proximal tubular epithelial cells exposed to a bacterial endotoxin (lipopolysaccharide, LPS). This investigation has provided key features on the relationship between oxidative stress and mitochondrial respiratory chain activity defects. LPS treatment resulted in an increase in the expression of inducible nitric oxide synthase (iNOS) and NADPH oxidase 4 (NOX-4), suggesting the cytosolic overexpression of nitric oxide and superoxide anion, the primary reactive nitrogen species (RNS) and reactive oxygen species (ROS). This oxidant state seemed to interrupt mitochondrial oxidative phosphorylation by reducing cytochrome c oxidase activity. As a consequence, disruptions in the electron transport and the proton pumping across the mitochondrial inner membrane occurred, leading to a decrease of the mitochondrial membrane potential, a release of apoptotic-inducing factors and a depletion of adenosine triphosphate. Interestingly, after being targeted by RNS and ROS, mitochondria became in turn producer of ROS, thus contributing to increase the mitochondrial dysfunction. The role of oxidants in mitochondrial dysfunction was further confirmed by the use of iNOS inhibitors or antioxidants that preserve cytochrome c oxidase activity and prevent mitochondrial membrane potential dissipation. These results suggest that sepsis-induced AKI should not only be regarded as failure of energy status but also as an integrated response, including transcriptional events, ROS signaling, mitochondrial activity and metabolic orientation such as apoptosis.
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Affiliation(s)
- C Quoilin
- Laboratory of Biomedical Spectroscopy, Department of Physics, University of Liège, 4000 Liège, Belgium.
| | - A Mouithys-Mickalad
- Center of Oxygen Research and Development, Department of Chemistry, University of Liège, 4000 Liège, Belgium
| | - S Lécart
- Centre de Photonique Biomédicale, CPBM/CLUPS, Fédération LUMAT, University Paris Sud, 91405 Orsay, France
| | - M-P Fontaine-Aupart
- Centre de Photonique Biomédicale, CPBM/CLUPS, Fédération LUMAT, University Paris Sud, 91405 Orsay, France; Institut des Sciences Moléculaires d'Orsay, CNRS and University Paris Sud, 91405 Orsay, France
| | - M Hoebeke
- Laboratory of Biomedical Spectroscopy, Department of Physics, University of Liège, 4000 Liège, Belgium
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Mouithys-Mickalad A, Deby-Dupont G, Hoebeke M, Mathy-Hartert M, Lamy M, Deby C. Effects of sphingosine and sphingosine analogues on the free radical production by stimulated neutrophils: ESR and chemiluminescence studies. Mediators Inflamm 2012; 6:327-33. [PMID: 18472867 PMCID: PMC2365874 DOI: 10.1080/09629359791460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Sphingolipids inhibit the activation of the neutrophil (PMN) NADPH oxidase by protein kinase C pathway. By electron spin resonance spectroscopy (ESR) and chemiluminescence (CL), we studied the effects of sphingosine (SPN) and ceramide analogues on phorbol 12-myristate 13-acetate (PMA, 5 × 10-7M) stimulated PMN (6 × 106 cells). By ESR with spin trapping (100 mM DMPO: 5,5-dimethyl-1-pyrroline-Noxide), we showed that SPN (5 to 8 × 10-6M), C2-ceramide (N-acetyl SPN) and C6-ceramide (N-hexanoyl SPN) at the final concentration of 2 × 10-5 and 2 × 10-4M inhibit the production of free radicals by stimulated PMN. The ESR spectrum of stimulated PMN was that of DMPO-superoxide anion spin adduct. Inhibition by 5 × 10-6M SPN was equivalent to that of 30 U/ml SOD. SPN (5 to 8 × 10-6M) has no effect
on in vitro systems generating superoxide anion (xanthine 50 mM/xanthine oxidase 110 mU/ml) or hydroxyl radical (Fenton reaction: 88 mM H2O2, 0.01 mM Fe2+ and 0.01 mM EDTA). SPN and N-acetyl SPN also inhibited the CL of PMA stimulated PMN in a dose dependent manner (from 2 × 10-6 to 10-5M), but N-hexanoyl SPN was less active (from 2 × 10-5 to 2 × 10-4M). These effects were compared with those of known PMN inhibitors, superoxide dismutase, catalase and azide. SPN was a better inhibitor compared with these agents. The complete inhibition by SPN of ESR signal and CL of stimulated PMN confirms that this compound or one of its metabolites act at the level of NADPH-oxidase, the key enzyme responsible for production of oxygen-derived free radicals.
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Affiliation(s)
- A Mouithys-Mickalad
- Centre for the Biochemistry of Oxygen, University of Liège, and Department of Anesthesia and Intensive Care Medicine, University Hospital of Liège, Liège 4000 Belgium.
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Grammenos A, Mouithys-Mickalad A, Guelluy PH, Lismont M, Piel G, Hoebeke M. ESR technique for noninvasive way to quantify cyclodextrins effect on cell membranes. Biochem Biophys Res Commun 2010; 398:350-4. [PMID: 20599748 DOI: 10.1016/j.bbrc.2010.06.050] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Accepted: 06/11/2010] [Indexed: 11/25/2022]
Abstract
A new way to study the action of cyclodextrin was developed to quantify the damage caused on cell membrane and lipid bilayer. The Electron Spin Resonance (ESR) spectroscopy was used to study the action of Randomly methylated-beta-cyclodextrin (Rameb) on living cells (HCT-116). The relative anisotropy observed in ESR spectrum of nitroxide spin probe (5-DSA and cholestane) is directly related to the rotational mobility of the probe, which can be further correlated with the microviscosity. The use of ESR probes clearly shows a close correlation between cholesterol contained in cells and cellular membrane microviscosity. This study also demonstrates the Rameb ability to extract cholesterol and phospholipids in time- and dose-dependent ways. In addition, ESR spectra enabled to establish that cholesterol is extracted from lipid rafts to form stable aggregates. The present work supports that ESR is an easy, reproducible and noninvasive technique to study the effect of cyclodextrins on cell membranes.
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Affiliation(s)
- A Grammenos
- Laboratory of Biomedical Spectroscopy, Department of Physics, B5, University of Liège, Sart-Tilman, Belgium.
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Levecq L, Donckier J, Michel L, Hoebeke M, Godfraind C, Guagnini A, Kozyreff A. 525 Intérêt de l’examen ophtalmologique dans le diagnostic de néoplasie endocrinienne multiple de type 2B. J Fr Ophtalmol 2007. [DOI: 10.1016/s0181-5512(07)80338-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bryson K, Loux V, Bossy R, Nicolas P, Chaillou S, van de Guchte M, Penaud S, Maguin E, Hoebeke M, Bessières P, Gibrat JF. AGMIAL: implementing an annotation strategy for prokaryote genomes as a distributed system. Nucleic Acids Res 2006; 34:3533-45. [PMID: 16855290 PMCID: PMC1524909 DOI: 10.1093/nar/gkl471] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We have implemented a genome annotation system for prokaryotes called AGMIAL. Our approach embodies a number of key principles. First, expert manual annotators are seen as a critical component of the overall system; user interfaces were cyclically refined to satisfy their needs. Second, the overall process should be orchestrated in terms of a global annotation strategy; this facilitates coordination between a team of annotators and automatic data analysis. Third, the annotation strategy should allow progressive and incremental annotation from a time when only a few draft contigs are available, to when a final finished assembly is produced. The overall architecture employed is modular and extensible, being based on the W3 standard Web services framework. Specialized modules interact with two independent core modules that are used to annotate, respectively, genomic and protein sequences. AGMIAL is currently being used by several INRA laboratories to analyze genomes of bacteria relevant to the food-processing industry, and is distributed under an open source license.
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Affiliation(s)
| | | | | | | | - S. Chaillou
- Flore Lactique et Environnement Carné, INRA78352 Jouy-en-Josas Cedex, France
| | | | - S. Penaud
- Génétique Microbienne, INRA78352 Jouy-en-Josas Cedex, France
| | - E. Maguin
- Génétique Microbienne, INRA78352 Jouy-en-Josas Cedex, France
| | | | | | - J-F Gibrat
- To whom correspondence should be addressed. Tel: +33 1 34 65 28 97; Fax: +33 1 34 65 29 01; E-mail:
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Abstract
The photochemistry of the anaesthetic agent propofol (PPF) was investigated in three different solvents of quite different polarity (cyclohexane, methanol and phosphate buffer pH 7) by means of nanosecond laser flash photolysis and absorption spectroscopy. GC-MS spectrometry measurements of PPF in cyclohexane have revealed the formation of two major products upon low intensity UV continuous irradiation of PPF in aerated solution: the diphenol derivative of PPF and 2,6-diisopropyl-p-benzoquinone (PPFQ). Only the diphenol compound was obtained in anaerobic solution. PPF phenoxyl radical (PPF ) generation has been assigned as the original step leading to the formation of both the diphenol compound and PPFQ in cyclohexane as revealed by laser flash photolysis at 266 nm and by electron paramagnetic resonance spectroscopy as well. Investigation of PPF by nanosecond flash photolysis at 266 nm in the other solvents revealed the occurrence of different photochemical processes depending on the nature and the polarity of the solvent. A reaction scheme is proposed in order to discuss the mechanism of reaction of PPF in all media.
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Affiliation(s)
- B Heyne
- Department of Physics, Institute of Physics (B5), Biomedical Spectroscopy (C.O.R.D.), University of Liège, Allée du 6 Août, 17, 4000, Liège, Belgium
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Heyne B, Brault D, Fontaine-Aupart MP, Kohnen S, Tfibel F, Mouithys-Mickalad A, Deby-Dupont G, Hans P, Hoebeke M. Reactivity towards singlet oxygen of propofol inside liposomes and neuronal cells. Biochim Biophys Acta Gen Subj 2005; 1724:100-7. [PMID: 15878638 DOI: 10.1016/j.bbagen.2005.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2004] [Revised: 03/30/2005] [Accepted: 04/01/2005] [Indexed: 11/21/2022]
Abstract
Singlet oxygen (1O2), a reactive oxygen species, has been found to be implicated in many cellular events and pathological disorders. Herein, we investigated the reactivity of 1O2 towards the anaesthetic agent propofol (PPF) encapsulated within DMPC liposomes. By time resolved luminescence, the rate constant of 1O2 quenching by PPF was evaluated, depending on the location of the sensitizer, with following values: 1.35+/-0.05x10(7) M(-1) s(-1) for deuteroporphyrin (as embedded source) and 0.8+/-0.04x10(7) M(-1) s(-1) for uroporphyrin (as external source), respectively. The nature of the oxidation product, resulting from the reaction of 1O2 with PPF, was determined using absorption and HPLC techniques. Finally, the in vitro protective effect of PPF towards the 1O2-induced neuronal cell toxicity was evaluated in terms of cell viability.
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Affiliation(s)
- B Heyne
- Department of Physics, Institute of Physics (B5), Biomedical Spectroscopy (C.O.R.D.), University of Liège, Allée du 6 Août, 17, 4000 Liège, Belgium
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10
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Giuliani A, Walker IC, Delwiche J, Hoffmann SV, Limão-Vieira P, Mason NJ, Heyne B, Hoebeke M, Hubin-Franskin MJ. The electronic states of 2-furanmethanol (furfuryl alcohol) studied by photon absorption and electron impact spectroscopies. J Chem Phys 2003. [DOI: 10.1063/1.1603733] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Levecq L, Hoebeke M, Guagnini AP, Snyers B. [Diffuse retinal epitheliopathy: study of 30 eyes]. Bull Soc Belge Ophtalmol 2003:55-62. [PMID: 12879725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Retrospective study of 17 patients (30 eyes) with diffuse retinal epitheliopathy followed for at least 5 years. The study is based on clinical data, ophthalmoscopic findings and fluorescein angiograms. The patients (16 men and 1 woman) are all caucasian with a mean age of 43 years. The disease is bilateral in 13 patients. We report an association with systemic corticosteroid treatment after kidney transplantation in 10 cases. Nine patients have arterial hypertension. Two patients are diabetic and 2 present high level of psychological stress. After a mean follow-up of 12 years, a loss of vision of at least 3 lines is noted in 17 eyes. The decrease in vision is related to an enlargement of the pigment epithelium atrophy to the fovea (15 eyes) or with permanent retrofoveolar serous detachment (2 eyes).
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Affiliation(s)
- L Levecq
- Service d'Ophtalmologie, Université Catholique Louvain, Cliniques Saint-Luc, Belgique
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Detrembleur C, Sciannamea V, Koulic C, Claes M, Hoebeke M, Jérôme R. Controlled Nitroxide-Mediated Radical Polymerization of Styrene, Styrene/Acrylonitrile Mixtures, and Dienes Using a Nitrone. Macromolecules 2002. [DOI: 10.1021/ma0201835] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Detrembleur
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - V. Sciannamea
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - C. Koulic
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - M. Claes
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - M. Hoebeke
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - R. Jérôme
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
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Abstract
MOTIVATION Protein-protein interactions are a potential source of valuable clues in determining the functional role of as yet uncharacterized gene products in metabolic pathways. Graph-like structures emerging from the accumulation of interaction data make it difficult to maintain a consistent and global overview by hand. Bioinformatics tools are needed to perform this graph visualization while maintaining a link to the experimental data. RESULTS "SPiD" is an online database for exploring networks of interacting proteins in Bacillus subtilis characterized by the two-hybrid system. Graphical displays of interaction networks are created dynamically as users interactively navigate through these networks. Third party applications can interface the database through a Common Object Request Broker Architecture (CORBA) tier. AVAILABILITY SPiD is available through its web site at http://www-mig.versailles.inra.fr/bdsi/SPiD, and through an Interoperable Object Reference (IOR) and its associated Interface Definition Language (IDL). CONTACT hoebeke@versailles.inra.fr
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Affiliation(s)
- M Hoebeke
- Unité Mathématique, Informatique & Génome, INRA CRV, Route de St. Cyr, F-78026 Versailles Cedex, France.
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Damoiseau X, Schuitmaker HJ, Lagerberg JW, Hoebeke M. Increase of the photosensitizing efficiency of the Bacteriochlorin a by liposome-incorporation. J Photochem Photobiol B 2001; 60:50-60. [PMID: 11386681 DOI: 10.1016/s1011-1344(01)00118-x] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To describe the action mechanisms of Bacteriochlorin a (BCA), a second generation photosensitizer, in phosphate buffer (PB) and in dimyristoyl phosphatidylcholine (DMPC) liposomes we carried out oxygen consumption and ESR measurements. In PB, where BCA was in a monomer-dimer equilibrium, our results suggested that the oxygen consumption was related to the BCA monomers concentration in solution. Incorporation of BCA in DMPC liposomes, by promoting the monomerization of BCA, increased 9-fold the oxygen consumption in comparison to the value in PB. The use of specific singlet oxygen quenchers (Azide and 9,10-Anthracenedipropionic acid) in ESR and oxygen consumption experiments allowed us to assert that BCA was mainly a type II sensitizer when it was incorporated in DMPC. Finally, the cell survival of WiDr cells after a PDT treatment was measured for cells incubated with BCA in cell culture medium and cells incubated with BCA in DMPC. Irrespective of the dye concentration, the cell survival was lower when liposomes were used. This effect could be the result of a better BCA monomerization and/or a different BCA uptake in cells.
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Affiliation(s)
- X Damoiseau
- Experimental Physics, Institute of Physics, University of Liège, Belgium.
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Hoebeke M, Damoiseau X, Schuitmaker HJ, Van de Vorst A. Fluorescence, absorption and electron spin resonance study of bacteriochlorin a incorporation into membrane models. Biochimica et Biophysica Acta (BBA) - Biomembranes 1999; 1420:73-85. [PMID: 10446292 DOI: 10.1016/s0005-2736(99)00097-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Analysis of the bacteriochlorin a absorption spectra suggests the existence of a monomer-dimer equilibrium, particularly intense in phosphate buffer and favored by a decrease of the pH. The dye in methanolic solution is predominantly in monomeric form. Fluorescence and electron spin resonance nitroxide spin labeling measurements indicate that incorporation into the lipid phase of dimyristoyl-L-alpha-phosphatidylcholine liposomes induces dye monomerization. Moreover, the molecules are bound in the external surface of the vesicles and a complete incorporation is ensured by a lipid-to-dye ratio greater than 125.
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Affiliation(s)
- M Hoebeke
- Department of Experimental Physics, Institute of Physics B5, University of Liège, 4000, Liège, Belgium
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Deckers S, Delgrange E, Hoebeke M, Dahan K, Donckier J. Non-Mediterranean periodic fever. Lancet 1999; 353:382. [PMID: 9950455 DOI: 10.1016/s0140-6736(05)74956-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Mouithys-Mickalad A, Hans P, Deby-Dupont G, Hoebeke M, Deby C, Lamy M. Propofol reacts with peroxynitrite to form a phenoxyl radical: demonstration by electron spin resonance. Biochem Biophys Res Commun 1998; 249:833-7. [PMID: 9731222 DOI: 10.1006/bbrc.1998.9235] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Peroxynitrite (ONOO-), resulting from the reaction of nitric oxide with superoxide anion, is a powerful oxidant produced in activated macrophages, during ischemia-reperfusion processes as well as in neurodegenerative disorders. This study investigated the reaction of the anesthetic agent propofol (PPF) with ONOO-, using electron spin resonance (ESR) and UV-visible spectrometry. Peroxynitrite was synthetized either from acidified hydrogen peroxide and nitrite, or from sodium azide and ozone. The addition of ONOO- to PPF in alkaline solution (pH 12) allowed to detect a, short lifetime, ESR signal corresponding to a phenoxyl radical. This finding was confirmed by a UV-visible study, resulting in the appearance of 427 nm peak and the disappearance of the peak located at 239 nm. The 291 nm peak remained unchanged. The identification of the end-product of the reaction of PPF with ONOO- needs further investigations.
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Deby-Dupont G, Deby C, Mouithys-Mickalad A, Hoebeke M, Mathy-Hartert M, Jadoul L, Vandenberghe A, Lamy M. The antibiotic ceftazidime is a singlet oxygen quencher as demonstrated by ultra-weak chemiluminescence and by inhibition of AAP consumption. Biochim Biophys Acta 1998; 1379:61-8. [PMID: 9468333 DOI: 10.1016/s0304-4165(97)00083-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We demonstrated that the cephalosporin antibiotic ceftazidime (CAZ) deactivated singlet oxygen (1O2). We then studied the mechanisms of the CAZ effects on the ultra weak chemiluminescence (uwCL) associated with the energy decay of 1O2 generated by the Mallet reaction (H2O2 + HOCl --> HCl + H2O + 1O2), and on the anthracene-9,10-dipropionic acid (AAP) consumption by 1O2 generated by irradiation of Rose Bengal (RB). The uwCL generated by the Mallet reaction was amplified (6.2 times) by CAZ. The use of red and blue filters, which absorb radiation below 610 nm and between 470 and 700 nm respectively, demonstrated that CAZ increased the uwCL by a radiation emission at wavelengths shorter than the 633 and 704 nm wavelength emissions of 1O2. CAZ was excited by scavenging the energy excess of 1O2, which so returned to its fundamental state, while CAZ deactivated with light emission between 430-480 nm. CAZ also inhibited in a dose-dependent manner the consumption of AAP by 1O2 generated by the irradiation of RB. The protection of AAP by 5 x 10(-3) M CAZ was equivalent to that of 10(-3) M histidine and 3 X 10(-6) M sodium azide. This process of 1O2 deactivation will be useful in diseases characterized by an excessive PMN activation with a release of activated oxygen species.
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Affiliation(s)
- G Deby-Dupont
- Centre for the Biochemistry of Oxygen, Institute de Chimie, B6a, Domaine Universitaire du Sart Tilman, Liège, Belgium.
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Hoebeke M, Schuitmaker HJ, Jannink LE, Dubbelman TM, Jakobs A, Van de Vorst A. Electron spin resonance evidence of the generation of superoxide anion, hydroxyl radical and singlet oxygen during the photohemolysis of human erythrocytes with bacteriochlorin a. Photochem Photobiol 1997; 66:502-8. [PMID: 9337622 DOI: 10.1111/j.1751-1097.1997.tb03180.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Photodynamic therapy with bacteriochlorin a (BCA) as sensitizer induces damage to red blood cells in vivo. To assess the extent of the contributuion of reactive oxygen species (ROS) and to determine a possible reaction mechanism, competition experiments with assorted ROS quenching or/and enhancing agents were performed in human erythrocytes as model system and in phosphate buffer. In the erythrocyte experiments, a 2% suspension was incubated with BCA for 1 h, washed with phosphate-buffered saline, resuspended and subsequently illuminated with a diode laser using a fluence rate of 2.65 mW/cm2. Potassium leakage and hemolysis were light and BCA dose dependent. Adding tryptophan (3.3 mM), azide (1 mM) or histidine (10 mM) to the erythrocyte suspension before illumination delayed the onset of K-leakage and hemolysis suggesting a type II mechanism. The D2O did not affect K-leakage nor photohemolysis. Adding mannitol (13.3 mM) or glycerol (300 nM) also caused a delay in the onset of K-leakage and hemolysis, suggesting the involvement of radicals. In phosphate buffer experiments, it was shown using electron spin resonance (ESR) associated with spin-trapping techniques that BCA is able to generate O2-. and OH. radicals without production of aqueous electron. Visible or UV irradiation of the dye in the presence of the spin trap 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) gave an ESR spectrum characteristic of the DMPO-hydroxyl radical spin adduct DMPO-OH. Addition of ethanol or sodium formate produced supplementary hyperfine splittings due to the respective CH3CHOH. and CO2-. radical adducts, indicating the presence of free OH.. Production of DMPO-OH was partly inhibited by superoxide dismutase (SOD), catalase and desferrioxamine, suggesting that the iron-catalyzed decomposition of H2O2 was partly involved in the formation of one part of the observed OH.. The complementary inhibition of DMPO-OH production by azide and 9,10-anthracenedipropionic acid (ADPA) was consistent with 1O2 production by BCA followed by reaction of 1O2 with DMPO and decay of the intermediate complex to form DMPO-OH and free OH.. All our results seem to indicate that BCA is a 50%/50% type 1/type 2 sensitizer in buffered aqueous solutions and confirmed that the dye-induced hemolysis of erythrocytes was cell caused by a mixed type 1/type 2 mechanism.
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Affiliation(s)
- M Hoebeke
- Institute of Physics, University of Liège, Belgium
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Ide C, De Coene B, Gilliard C, Pollo C, Hoebeke M, Godfraind C, Trigaux JP. Hemorrhagic arachnoid cyst with third nerve paresis: CT and MR findings. AJNR Am J Neuroradiol 1997; 18:1407-10. [PMID: 9296178 PMCID: PMC8338129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We report the CT and MR appearance of a nontraumatic hemorrhagic arachnoid cyst presenting with a third nerve paresis in a 37-year-old man. The cyst, located in the left suprasellar area, contained a fluid-blood level with stigmata of subacute hemorrhage on both CT and MR studies.
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Affiliation(s)
- C Ide
- Department of Radiology, Cliniques Universitaires UCL de Mont-Godinne, Yvoir, Belgium
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Eloy P, Bertrand B, Martinez M, Hoebeke M, Watelet JB, Jamart J. Endonasal dacryocystorhinostomy: indications, technique and results. Rhinology 1995; 33:229-33. [PMID: 8919217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Dacryocystorhinostomy (DCR) allows an obstructed lachrymal drainage system to be drained into the nasal fossa. Since the development of endonasal microsurgical techniques, the endonasal approach presents itself as an alternative choice to the conventional external approach. It is far less traumatic, yet as efficacious as the conventional approach, and avoids the need for a skin incision and the disruption of the medial canthal structures. Twenty-six patients suffering from lachrymal system obstruction underwent 28 endonasal dacryocystorhinostomies under microscopical (n = 25) or endoscopic control (n = 3). Pre-operative assessment included clinical symptoms (sac swelling, purulent secretions, epiphora) and outflow obstruction on X-rays (conventional dacryocystography and/or subtraction macrodacryocystography). Post-operatively, 23 DCR were free of symptoms. Two presented occasional epiphora and three were unsuccessful. The presence of pre-operative purulent secretions was significantly correlated with post-operative success and with lachrymal sac patency, which is also confirmed by X-ray examination (p<0.001). Thus in cases of purulent secretion with epiphora, X-ray examination is redundant and may be avoided. On the contrary, when epiphora is an isolated symptom, X-rays must be performed in order to determine where the obstruction is located and to provide information on lachrymal sac morphology.
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Affiliation(s)
- P Eloy
- Department of Otorhinolaryngology/Head and Neck Surgery, University Hospital, UCL de Mont-Godinne, Yvoir, Belgium
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Abstract
The various applications of liposomes in understanding photosensitization are described in this paper, with particular emphasis on the various kinds of information that these models allow to obtain in phototherapy. Liposomes are simple vesicles in which an aqueous phase is enclosed by a phospholipidic membrane. They are suitable models mimicking specific situations occurring in vivo and they allow study of the influence of physicochemical, photobiological and biochemical factors on the uptake of photosensitizers by tissues, their mechanisms of action and the subsequent photoinduced tumor necrosis. Moreover, solubilization of the sensitizer into the bilayer seems to improve its tumoral selectivity and its photodynamic efficiency.
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Affiliation(s)
- M Hoebeke
- Laboratory of Experimental Physics, University of Liège, Belgium
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Hoebeke M, Vorst AVD. RESEARCH NOTE ON THE CHARGE-TRANSFER PATHWAY IN THE MEROCYANINE 540 TRIPLET STATE QUENCHING BY NITROXYL RADICAL. Photochem Photobiol 1995. [DOI: 10.1111/j.1751-1097.1995.tb08620.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Galand E, Niezette J, Vanderschueren J, Garsou J, Hoebeke M. Variations of lyoluminescence with the commercial origin of the dosimeters. Radiat Phys Chem Oxf Engl 1993 1994. [DOI: 10.1016/0969-806x(94)90031-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hoebeke M, Enescu M, Lindqvist L. Quenching of merocyanine 540 triplet state by nitroxyl radicals in liposomal systems: a laser flash photolysis study. J Photochem Photobiol B 1994; 22:229-33. [PMID: 8014755 DOI: 10.1016/1011-1344(93)06967-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Laser flash photolysis experiments were undertaken to investigate the interaction between stearic acid nitroxide spin probes and photoexcited merocyanine 540 (MC540) in dimyristoyl-L-alpha-phosphatidylcholine liposomes (membrane model). The measurements of the paramagnetic signal decay kinetics of four different spin-labelled stearic acids (n-DSA) show that the direct interaction between the dye and the probe is affected by the position of the nitroxyl group along the carbon chain. Laser flash photolysis results reveal a significant decrease in the MC540 triplet lifetime in the presence of n-DSA, the effect depending on the depth at which the nitroxyl moiety is localized in the bilayer. Previous results on the rate of disappearance of the electron spin resonance (ESR) nitroxide signal on continuous photolysis of the same systems do not show the same dependence on the localization of the nitroxyl moiety in the liposome. Although the MC540 triplet state seems to be implicated in the reaction process, the results suggest that ESR and laser flash experiments demonstrate two different kinds of mechanism.
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Affiliation(s)
- M Hoebeke
- Laboratory of Experimental Physics, University of Liège, Belgium
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Hoebeke M, Seret A, Piette J, Van de Vorst A. Destruction of stearic acid nitroxyl radicals mediated by photoexcited merocyanine 540 in liposomal and micellar systems. Biochemistry 1993; 32:2730-6. [PMID: 8383524 DOI: 10.1021/bi00061a035] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Fatty acid spin labels have been included into liposomes and micelles, in order to study the photochemical behavior of merocyanine 540 toward nitroxyl radicals situated at various depths in the bilayer or the surfactant layer. Visible illumination of the dye, either free in ethanol or bound to liposomes or micelles, leads to the reduction of the electron spin resonance signal of the label. The efficiency of the interaction between merocyanine 540 and spin labels depends on the depth at which the nitroxyl moiety is localized in the micelle or vesicle. Fluorescence measurements indicate that the first excited singlet state of merocyanine 540 is not directly implicated in the reaction mechanism. Flash photolysis experiments conducted in aqueous solutions of hexadecyltrimethylammonium bromide micelles show that the presence of nitroxyl radical decreases the rate constant of triplet decay in a concentration-dependent fashion. The corresponding quenching rate constant (kq) is determined for the different spin labels. The kq values and the reduction rates of ESR signal show the same dependence on the localization of the nitroxyl moiety in the micelles.
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Affiliation(s)
- M Hoebeke
- Laboratory of Experimental Physics, Institute of Physics B5, University of Liège, Belgium
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Legrand-Poels S, Hoebeke M, Vaira D, Rentier B, Piette J. HIV-1 promoter activation following an oxidative stress mediated by singlet oxygen. J Photochem Photobiol B 1993; 17:229-37. [PMID: 8492240 DOI: 10.1016/1011-1344(93)80020-a] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Various biological processes, such as photosensitization or inflammatory reactions, can generate singlet oxygen (1O2) as one of the major oxidative species. Because this oxidant can be generated either extracellularly or intracellularly, it can cause severe damage to various biological macromolecules, even to those deeply embedded inside the cells such as DNA. Sublethal biological modifications induced by different DNA-damaging agents can promote various cellular responses initiated by the activation of various cellular genes and certain heterologous viruses. Since 1O2 fulfils essential prerequisites for a genotoxic substance, we have examined the effects of an oxidative stress, mediated by this species, on cells harbouring a heterologous promoter-leader sequence derived from the human immunodeficiency virus type 1 (HIV-1). Our results demonstrate that HIV-1 long terminal repeat (LTR), integrated into the cellular DNA of epithelial cells, can be transactivated following an oxidative stress mediated by 1O2. In addition, using HIV-1 latently infected promonocytes or lymphocytes, it can be shown that virus reactivation can be induced through a sublethal dose of 1O2 generated intracellularly. An extracellular generation of 1O2 can promote a substantial lethal effect without HIV-1 reactivation. These data may be relevant to the understanding of the events converting a latent infection into a productive one and to the appearance of the acquired immune deficiency syndrome.
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Affiliation(s)
- S Legrand-Poels
- Laboratory of Virology, Institute of Pathology, University of Liège, Belgium
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Abstract
The production of singlet oxygen by merocyanine 540 was studied in dimyristoyl-phosphatidylcholine liposomes using two singlet oxygen probes: 9,10-anthracenedipropionic acid (water soluble) and 9,10-dimethylanthracene (liposoluble). Upper and lower limits of singlet oxygen quantum yield for bound merocyanine 540 were determined to be 0.055 and 0.015 respectively. The diffusion characteristics of singlet oxygen were examined using the isotropic enhancement effect of D2O and the inhibitory effect of sodium azide. It was shown that 1O2 spent more than 87% of its lifetime in a vesicle environment. When the singlet-reacting substrate and the dye were both located in the bilayer, approximately 40% of the singlet oxygen remained in the liposomes where it was originally generated.
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Affiliation(s)
- M Hoebeke
- Institute of Physics B5, University of Liege, Belgium
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Abstract
Monomers and aggregates of Merocyanine 540 (MC540) in water are able to photoisomerize. The shape of the photoisomer absorption spectrum is very similar to that of the ground state. Triplet state of MC540 in water has been produced by energy transfer from triplet anthracene and displays a broad absorption spectrum between 600 and 700 nm. The triplet state may also be produced by direct excitation of MC540 with UV light. However, when the dye is excited by visible light, no triplet state absorbance in the red could be detected so that the triplet yield of MC540 in water seems to be excitation wavelength dependent.
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Affiliation(s)
- A Seret
- Université de Liège, Physique Expérimentale, Institut de Physique, Belgium
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Hoebeke M, Seret A, Piette J, van de Vorst A. Singlet oxygen production and photoisomerization: two competitive processes for merocyanine 540 irradiated with visible light. J Photochem Photobiol B 1988; 1:437-46. [PMID: 3149292 DOI: 10.1016/1011-1344(88)85004-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The quantum yields of singlet oxygen production by merocyanine 540 have been measured during visible light irradiation performed in methanol and ethanol. These appear to be one hundred times smaller than the quantum yield for rose bengal measured under the same conditions. Flash photolysis experiments demonstrate the ability of merocyanine 540 molecules to isomerize under visible light irradiation: the isomerization quantum yields are about 0.65 in both ethanol and methanol. This information combined with the fluorescence quantum yield data account for the low values for singlet oxygen production.
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Affiliation(s)
- M Hoebeke
- Institut de Physique, Université de Liège, Belgium
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