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Elferchichi M, Mercier J, Ammari M, Belguith H, Abdelmelek H, Sakly M, Lambert K. Subacute static magnetic field exposure in rat induces a pseudoanemia status with increase in MCT4 and Glut4 proteins in glycolytic muscle. Environ Sci Pollut Res Int 2016; 23:1265-1273. [PMID: 26358208 DOI: 10.1007/s11356-015-5336-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Accepted: 08/28/2015] [Indexed: 06/05/2023]
Abstract
The purpose of this study was to investigate the effect of subacute exposure to static magnetic fields (SMF) on hematological and muscle biochemical parameters in rats. Male Wistar rats, daily exposed to SMF, were exposed to SMF (128 mT, 1 h/day) during 15 consecutive days. SMF-exposed rats showed a significant decrease in red blood cell (RBC) count, hemoglobin (Hb), and hematocrit (Ht) values compared to sham-exposed rats (p < 0.05). Concomitant decreases of plasma iron level against increase in transferrin amount were also observed after SMF exposure (p < 0.0.05). In postprandial condition, SMF-exposed rats presented higher plasma lactate (p < 0.01). Additionally, SMF exposure increased monocarboxylate transporters (MCT4) and glucose transporter 4 (Glut4)'s contents only in glycolytic muscle (p < 0.05). SMF exposure induced alteration of hematological parameters; importantly, we noticed a pseudoanemia status, which seems to affect tissue oxygen delivery. Additionally, SMF exposure seems to favor the extrusion of lactate from the cell to the blood compartment. Given that, these arguments advocate for an adaptive response to a hypoxia status following SMF exposure.
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Affiliation(s)
- Miryam Elferchichi
- Laboratoire de Physiologie Intégrée, Faculté des Sciences de Bizerte, Université de Carthage, Jarzouna, 7021, Tunisia.
- PHYMEDEXP, INSERM U1046, CNRS UMR 9214, Université de Montpellier, Montpellier, France.
| | - Jacques Mercier
- PHYMEDEXP, INSERM U1046, CNRS UMR 9214, Université de Montpellier, Montpellier, France
| | - Mohamed Ammari
- Laboratoire de Physiologie Intégrée, Faculté des Sciences de Bizerte, Université de Carthage, Jarzouna, 7021, Tunisia
| | - Hatem Belguith
- Laboratoire de Physiologie Intégrée, Faculté des Sciences de Bizerte, Université de Carthage, Jarzouna, 7021, Tunisia
| | - Hafedh Abdelmelek
- Laboratoire de Physiologie Intégrée, Faculté des Sciences de Bizerte, Université de Carthage, Jarzouna, 7021, Tunisia
| | - Mohsen Sakly
- Laboratoire de Physiologie Intégrée, Faculté des Sciences de Bizerte, Université de Carthage, Jarzouna, 7021, Tunisia
| | - Karen Lambert
- PHYMEDEXP, INSERM U1046, CNRS UMR 9214, Université de Montpellier, Montpellier, France
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Messaoudi A, Belguith H, Ben Hamida J. Homology modeling and virtual screening approaches to identify potent inhibitors of VEB-1 β-lactamase. Theor Biol Med Model 2013; 10:22. [PMID: 23547944 PMCID: PMC3668210 DOI: 10.1186/1742-4682-10-22] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Accepted: 03/23/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND blaVEB-1 is an integron-located extended-spectrum β-lactamase gene initially detected in Escherichia coli and Pseudomonas aeruginosa strains from south-east Asia. Several recent studies have reported that VEB-1-positive strains are highly resistant to ceftazidime, cefotaxime and aztreonam antibiotics. One strategy to overcome resistance involves administering antibiotics together with β-lactamase inhibitors during the treatment of infectious diseases. During this study, four VEB-1 β-lactamase inhibitors were identified using computer-aided drug design. METHODS The SWISS-MODEL tool was utilized to generate three dimensional structures of VEB-1 β-lactamase, and the 3D model VEB-1 was verified using PROCHECK, ERRAT and VERIFY 3D programs. Virtual screening was performed by docking inhibitors obtained from the ZINC Database to the active site of the VEB-1 protein using AutoDock Vina software. RESULTS AND CONCLUSION Homology modeling studies were performed to obtain a three-dimensional structure of VEB-1 β-lactamase. The generated model was validated, and virtual screening of a large chemical ligand library with docking simulations was performed using AutoDock software with the ZINC database. On the basis of the dock-score, four molecules were subjected to ADME/TOX analysis, with ZINC4085364 emerging as the most potent inhibitor of the VEB-1 β-lactamase.
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Affiliation(s)
- Abdelmonaem Messaoudi
- Unité de Protéomie Fonctionnelle and Biopréservation Alimentaire, Institut Supérieur des Sciences Biologiques Appliquées de Tunis, Université Tunis El Manar, 09, Rue Docteur Zouheïr Safi - 1006, Tunis, Tunisia.
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Abstract
Triacylglycerol lipases have been thoroughly characterized in mammals and microorganisms. By contrast, very little is known about plant lipases. In this investigation, a homology model of Arabidopsis thaliana lipase (NP_179126) was constructed using a human gastric lipase (PDB ID: 1HLG), as a template for model building. This model was then assessed for stereochemical quality and side chain environment. Natural substrates: tributyrin, trioctanoin and triolen were docked into the model to investigate ligand-substrate interaction.
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Affiliation(s)
- Abdelmonaem Messaoudi
- Unité de Protéomie Fonctionnelle and Biopréservation Alimentaire, Institut Supérieur des Sciences Biologiques Appliquées de Tunis, Université Tunis El Manar, Tunisie
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Lahbib A, Elferchichi M, Ghodbane S, Belguith H, Chater S, Sakly M, Abdelmelek H. Time-dependent effects of exposure to static magnetic field on glucose and lipid metabolism in rat. Gen Physiol Biophys 2011; 29:390-5. [PMID: 21157002 DOI: 10.4149/gpb_2010_04_390] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In the following study, we investigate the effects of static magnetic field (SMF) (128 mT, 1 h/day during 5 or 15 consecutive days) on anthropometric parameters, glucose and lipid metabolism in rats. Exposure to SMF during 5 days induced a decrease (-8%, p < 0.05) in relative liver weight and serum insulin concentration (-56%, p < 0.001), while blood glucose level was increased (+10%, p < 0.001). By contrast, the same treatment failed to alter body weight, relative kidney weight and levels of lactate, cholesterol, triglycerides and phospholipids. Exposure to SMF during 15 days induced a decrease (-15 %, p < 0.001) in body weight, liver weight (-15 %, p < 0.05), insulin concentration (-63%, p < 0.001), plasmatic lactate level (-55%, p < 0.05) and increased glucose (+24%, p < 0.001), cholesterol (+30%, p < 0.01,) and phospholipids levels (+58%, p < 0.001), whereas, triglycerides decreased (-28%, p < 0.001). These results showed that SMF effects on glucose and lipid metabolism are time-dependent.
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Affiliation(s)
- Aida Lahbib
- Laboratoire de Physiologie Integrée, Faculté des Sciences de Bizerte, 7021 Jarzouna, Tunisia.
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Elferchichi M, Mercier J, Bourret A, Gross R, Lajoix AD, Belguith H, Abdelmelek H, Sakly M, Lambert K. Is static magnetic field exposure a new model of metabolic alteration? Comparison with Zucker rats. Int J Radiat Biol 2011; 87:483-90. [PMID: 21219108 DOI: 10.3109/09553002.2011.544371] [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] [Indexed: 11/13/2022]
Abstract
PURPOSE The aim of this study was to investigate if the metabolic alterations observed after static magnetic field (SMF) exposure participates in the development of a pre-diabetic state. A comparison study using the insulin resistant animal model, the Zucker rat and the SMF-exposed Wistar rat was carried out. MATERIALS AND METHODS Zucker rats were compared to Wistar rats either exposed to a 128 mT or 0 mT SMF (sham exposed) and analysed. This moderate-intensity SMF exposure of Wistar rats was performed for 1 h/day during 15 consecutive days. RESULTS Wistar rats exposed to the SMF showed increased levels of carbohydrate and lipid metabolites (i.e., lactate, glycerol, cholesterol and phospholipids) compared to sham-exposed rats. Zucker rats displayed a normoglycemia associated with a high insulin level as opposed to Wistar rats which presented hyperglycemia and hypoinsulinemia after exposure to the SMF. During the glucose tolerance test, unexposed Zucker rats and Wistar rats exposed to the SMF exhibited a significantly higher hyperglycemia compared to sham-exposed Wistar rats suggesting an impairment of glucose clearance. In muscle, glycogen content was lower and phospholipids content was elevated for both unexposed Zucker rats and Wistar rats exposed to the SMF compared to Wistar rats sham control. CONCLUSIONS This study provides evidence that the metabolic alterations following exposure to a static magnetic field of moderate intensity could trigger the development of a pre-diabetic state.
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Affiliation(s)
- Miryam Elferchichi
- Faculté des Sciences de Bizerte, Laboratoire de Physiologie Intégrée, Jarzouna, Tunisia
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Belguith H, Kthiri F, Ben Ammar A, Jaafoura H, Ben Hamida J, Landoulsi A. Morphological and Biochemical Changes of Salmonella hadar Exposed to Aqueous Garlic Extract. INT J MORPHOL 2009. [DOI: 10.4067/s0717-95022009000300013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Belguith H, Hajji S, Salem N, Charfeddine I, Lahmar I, Amor MB, Ouldim K, Chouery E, Driss N, Drira M, Mégarbané A, Rebai A, Sefiani A, Masmoudi S, Ayadi H. Analysis of GJB2 mutation: evidence for a Mediterranean ancestor for the 35delG mutation. Clin Genet 2005; 68:188-9. [PMID: 15996220 DOI: 10.1111/j.1399-0004.2005.00474.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Masmoudi S, Charfedine I, Rebeh IB, Rebai A, Tlili A, Ghorbel AM, Belguith H, Petit C, Drira M, Ayadi H. Refined mapping of the autosomal recessive non-syndromic deafness locus DFNB13 using eight novel microsatellite markers. Clin Genet 2004; 66:358-64. [PMID: 15355440 DOI: 10.1111/j.1399-0004.2004.00311.x] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The locus for a type of an autosomal recessive non-syndromic deafness (ARND), DFNB13, was previously mapped to a 17-cm interval of chromosome 7q34-36. We identified two consanguineous Tunisian families with severe to profound ARND. Linkage analyses with microsatellites surrounding the previously identified loci detected linkage with markers corresponding to the DFNB13 locus in both families. Haplotype analyses assigned this locus to a 3.2-Mb region between markers D7S2468 and D7S2473. In order to refine this interval, we identified nine dinucleotide repeats in the 7q34 region. To investigate the polymorphism of these repeats, a population study of 74 unrelated individuals from different regions of Tunisia was carried out. Our results demonstrated that eight of the nine repeats are polymorphic. The average number of alleles at these informative loci was 9.12 with a polymorphism information content of 0.71. Little evidence for linkage disequilibrium between some marker pairs was found. Haplotype analysis using these microsatellites refined the DFNB13 interval to an area of 2.2 Mb between the D7S5377 and D7S2473. In order to identify the DFNB13 gene, we sequenced and eliminated three candidate genes. Other known and predicted genes are being screened for deafness-causing mutations.
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Affiliation(s)
- S Masmoudi
- Laboratoire de Génétique Moléculaire Humaine, Faculté de Médecine de Sfax, Sfax, Tunisie
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Abstract
A recent advance in the study of plant lipases involving immunological techniques is presented. In an attempt to characterize lipases of cotyledons from germinating rapeseed seedlings and to investigate an eventual cross-reactivity with animal lipases, we have prepared anti-porcine pancreatic lipase antibodies raised in rabbit. It is shown by enzyme-linked immunosorbent assay and dot-blotting that these antibodies react with lipases in the rapeseed crude extract and in the different cellular fractions obtained by differential centrifugation. Preincubation of the antiserum with the rapeseed crude extract affects the amount of antibodies binding to the porcine pancreatic lipase. We demonstrate immunochemical cross-reactivity between rapeseed and porcine pancreatic lipase. Using the immunoblotting procedure, it is found that antibodies bind specifically to a single polypeptide with a molecular mass of about 55 kDa. Rapeseed lipase activity decreased after immunoprecipitation suggesting that antibodies were bound to some catalytic site residues. We conclude from the data obtained in this study that the two different lipase species present close similarities in amino acid sequence and antigen characteristics.
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Affiliation(s)
- H Belguith
- Laboratoire de Biochimie des protéines, Faculté des Sciences de Tunis, Tunis, Tunisia
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Belguith H, Jridi T, Ben Hamida J. Evidence of cross-reactivity between porcine pancreatic and rapeseed (Brassica napus L.) lipases. Biochem Soc Trans 2000; 28:974-6. [PMID: 11171277] [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: 02/18/2023]
Abstract
A cross-reactivity between animal and plant lipases was determined, using immunological techniques. It was shown by ELISA and dot-blotting that these antibodies react with lipases in the rapeseed crude extract and in the different cellular fractions obtained by differential centrifugation. Pre-incubation of the antiserum with the rapeseed crude extract affects the amount of antibodies binding to the porcine pancreatic lipase. Antibodies were able to precipitate lipase activity from 3-day-old rapeseed crude extract. These epitopes seem to be located in the catalytic site, suggesting that a consensus sequence exists in oleaginous lipases and that it will be universal.
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Affiliation(s)
- H Belguith
- Departement des Sciences Biologiques, Laboratoire de Biochimie des Protéines, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia.
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