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Brahmi N, Feriani A, Ben Ali M, Hedfi A, Elleuch A, Ismail IA, Albogami B, Saif T, Talarmin H, El Feki A, Allagui MS. Potential Hepatoprotective Effect of Cheatomorpha gracilis extract against High Fat Diet (HFD)-Induced Liver Damage, and its characterization by HPLC. BRAZ J BIOL 2021; 82:e247102. [PMID: 34161431 DOI: 10.1590/1519-6984.247102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 02/17/2021] [Indexed: 11/22/2022] Open
Abstract
The current investigation was carried out to estimate the protective effect of aqueous extract of Cheatomorpha gracilis (AEC) against High fat Diet (HFD) induced liver damage in mice. The results of the in vitro study showed that AEC have higher antioxidant capacities in the DPPH and hydroxyl radical-scavenging assays. Indeed, many phenolic compounds (gallic acid, quercetin, naringenin, apigenin, kaempferol and rutin) were identified in the AEC. In the animal studies, during 6 weeks, HFD promoted oxidative stress with a rise level of malonaldehyde (MDA), protein carbonyls (PCOs) levels and a significant decrease of the antioxidant enzyme activities such as superoxide dismutase, catalase and glutathione peroxidase. Interestingly, the treatment with AEC (250 mg/kg body weight) significantly reduced the effects of HFD disorders on some plasmatic liver biomarkers (AST, ALT and ALP) in addition to, plasmatic proteins inflammatory biomarkers (α2 and β1 decreases / β2 and γ globulins increases). It can be suggest that supplementation of MECG displays high potential to quench free radicals and attenuates high fat diet promoted liver oxidative stress and related disturbances.
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Affiliation(s)
- N Brahmi
- University of Sfax, Faculty of Sciences of Sfax, Laboratory of Animal Physiology, Sfax, Tunisia.,University of Gafsa, Faculty of Sciences of Gafsa, Research Unit of Macromolecular Biochemistry and Genetic, Gafsa, Tunisia
| | - A Feriani
- University of Gafsa, Faculty of Sciences of Gafsa, Research Unit of Macromolecular Biochemistry and Genetic, Gafsa, Tunisia
| | - M Ben Ali
- Department of Biology, College of Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.,University of Carthage, Faculty of Sciences of Bizerte, Laboratory of Environment Biomonitoring LR01 ES14, Zarzouna 7021, Tunisia
| | - A Hedfi
- Department of Biology, College of Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.,University of Carthage, Faculty of Sciences of Bizerte, Laboratory of Environment Biomonitoring LR01 ES14, Zarzouna 7021, Tunisia
| | - A Elleuch
- CHU Habib Bourguiba, Laboratory of Biochemistry, Sfax, Tunisia
| | - I A Ismail
- Department of Biology, College of Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.,Department of Plant Genetic Transformation, Agricultural Genetic Engineering Research Institute, Agricultural Research Center, 12619, Giza, Egypt
| | - B Albogami
- Department of Biology, College of Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - T Saif
- National Institute of Oceanography and Fisheries, Cairo, Egypt
| | - H Talarmin
- Université de Bretagne Occidentale, Laboratory ORPHY EA4324, UFR Sciences et Technique, Brest, France
| | - A El Feki
- University of Gafsa, Faculty of Sciences of Gafsa, Research Unit of Macromolecular Biochemistry and Genetic, Gafsa, Tunisia
| | - M S Allagui
- University of Sfax, Faculty of Sciences of Sfax, Laboratory of Animal Physiology, Sfax, Tunisia.,University of Gafsa, Faculty of Sciences of Gafsa, Research Unit of Macromolecular Biochemistry and Genetic, Gafsa, Tunisia
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Ben Saad H, Ben Amara I, Kharrat N, Giroux-Metgès MA, Hakim A, Zeghal KM, Talarmin H. Cytoprotective and antioxidant effects of the red alga Alsidium corallinum against hydrogen peroxide-induced toxicity in rat cardiomyocytes. Arch Physiol Biochem 2019; 125:35-43. [PMID: 29431472 DOI: 10.1080/13813455.2018.1437184] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
CONTEXT Sepsis is the manifestation of the immune and inflammatory responses to infection that may ultimately result in multiorgan failure. Many substances are involved in myocardial dysfunction in sepsis, including hydrogen peroxide. OBJECTIVE This study evaluates the protective activity of the red alga Alsidium corallinum against hydrogen peroxide (H2O2)-induced toxicity in H9c2 cardiomyocytes. MATERIAL AND METHODS The biological properties of A. corallinum were firstly investigated. Secondly, the H9c2 cells were pre-treated with alga extract, and then exposed to H2O2. RESULTS Our results showed richness of the alga in antioxidant compounds, and its biological activities. H2O2 induced a morphological changes and decrease in H9c2 cell viability correlating with an increase in enzymatic and non-enzymatic antioxidants. Pre-treatment with A. corallinum, reduces toxicity and decreased the antioxidants status induced by H2O2. CONCLUSION These findings indicated for the first time the protective effect of A. corallinum against H2O2-induced toxicity in H9c2 cells.
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Affiliation(s)
- Hajer Ben Saad
- a Laboratory of Pharmacology, Faculty of Medicine , University of Sfax , Sfax , Tunisia
| | - Ibtissem Ben Amara
- b Higher Institute of Biotechnology , University of Sfax , Sfax , Tunisia
| | - Nadia Kharrat
- c Laboratory of Biochemistry and Enzymatic Engineering of Lipases , Sfax University , Sfax , Tunisia
| | - Marie-Agnès Giroux-Metgès
- d ORPHY, Optimization of Physiological Regulation, EA4324, Faculty of Medicine and Health Sciences , University of Western Brittany , Brest , France
| | - Ahmed Hakim
- a Laboratory of Pharmacology, Faculty of Medicine , University of Sfax , Sfax , Tunisia
| | - Khaled Mounir Zeghal
- a Laboratory of Pharmacology, Faculty of Medicine , University of Sfax , Sfax , Tunisia
| | - Hélène Talarmin
- d ORPHY, Optimization of Physiological Regulation, EA4324, Faculty of Medicine and Health Sciences , University of Western Brittany , Brest , France
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Bouzenna H, Hfaiedh N, Bouaziz M, Giroux-Metges MA, Elfeki A, Talarmin H. Cytoprotective effects of essential oil of Pinus halepensis L. against aspirin-induced toxicity in IEC-6 cells. Arch Physiol Biochem 2017; 123:364-370. [PMID: 28719240 DOI: 10.1080/13813455.2017.1347689] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
CONTEXT Essential oils from Pinus species have been reported to have various therapeutic properties. OBJECTIVE This study was undertaken to identify the chemical composition and cytoprotective effects of the essential oil of Pinus halepensis L. against aspirin-induced damage in cells in vitro. MATERIAL AND METHODS The cytoprotection of the oil against toxicity of aspirin on the small intestine epithelial cells IEC-6 was tested. RESULTS The obtained results have shown that 35 different compounds were identified. Aspirin induced a decrease in cell viability, and exhibited significant damage to their morphology and an increase in superoxide dismutase (SOD) and catalase (CAT) activities. However, the co-treatment of aspirin with the essential oil of Pinus induced a significant increase in cell viability and a decrease in SOD and CAT activities. CONCLUSION Overall, these finding suggest that the essential oil of Pinus halepensis L. has potent cytoprotective effect against aspirin-induced toxicity in IEC-6 cells.
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Affiliation(s)
- Hafsia Bouzenna
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
- c Laboratory Animal Eco Physiology , Faculty of Sciences of Gafsa , Gafsa , Tunisia
| | - Najla Hfaiedh
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
- c Laboratory Animal Eco Physiology , Faculty of Sciences of Gafsa , Gafsa , Tunisia
| | | | - Marie-Agnès Giroux-Metges
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
| | - Abdelfattah Elfeki
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
| | - Hélène Talarmin
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
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Bettaib J, Talarmin H, Kalai FZ, Giroux-Metges MA, Ksouri R. Limoniastrum guyonianum prevents H 2O 2-induced oxidative damage in IEC-6 cells by enhancing enzyamtic defense, reducing glutathione depletion and JNK phosphorylation. Biomed Pharmacother 2017; 95:1404-1411. [PMID: 28946188 DOI: 10.1016/j.biopha.2017.09.068] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 07/13/2017] [Revised: 09/04/2017] [Accepted: 09/13/2017] [Indexed: 02/08/2023] Open
Abstract
Limoniastrum guyonianum is used in several regions of North Africa as a folk medicine. The objective of this study was to determine the in vitro antioxidant activities of L. guyonianum roots and their cytoprotective action on H2O2-challenged rat small intestine epithelial cells (IEC-6 cells). To assess the cytoprotective effect of L. guyonianum extract (LGE), IEC-6 cells were pre-incubated with different LGE concentrations. Then, IEC-6 cultures were exposed to 40μM H2O2 during 4h. Modulation of endogenous antioxidant system including SOD, CAT, MDA, GSH and the expression of possibly involved MAPKs was evaluated. Main results reported that L. guyonianum was rich in polyphenols and exhibited an important antioxidant activity as revealed by different tests (DPPH Assay, IC50=1.6μg/mL; ABTS+ test, IC50=27μg/mL; Fe-reducing power, EC50=44μg/mL). HPLC analysis showed that quercetin, catechin, and isorhamnetin-3-O-rutinoside were major phenolics. The exposure of IEC-6 cells to 40μM H2O2 during 4h resulted in oxidative stress manifested by (i) over 70% cell mortality, (ii) over-activity of CAT (246%), (iii) decrease in GSH level (10.4nmol/mg), (iv) excess in MDA content (18.4nmol/mg), and (v) a trigger of JNK phosphorylation. Pretreatment with LGE, especially at 0.25μg/mL, restored cell viability to 100%, and normal cell morphology in H2O2-chalenged cells. In addition, this extract maintained a high CAT activity, enhanced SOD capacity (120%) and increased GSH level (45.5nmol/mg). Furthermore, reducing cell death seems to be due to dephosphorylated JNK MAPK exerted by L. guyonianum bioactive compounds. In all, L. guyonianum components provided a cross-talk between regulatory pathways, implying their role as cytoprotector against oxidative stress.
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Affiliation(s)
- Jamila Bettaib
- Université de Tunis El Manar, Faculté des Sciences de Tunis, 2092 Tunis, Tunisia; Centre de Biotechnologie de Borj-Cédria, LR15CBBC06 Laboratoire des Plantes Aromatiques et Médicinales, BP 901, 2050 Hammam-Lif, Tunisia; Université de Bretagne Occidentale, Faculté de Médecine et des Sciences de la Santé, EA 4324 Laboratoire de Physiologie ORPHY, 29200 Brest, France.
| | - Hélène Talarmin
- Université de Bretagne Occidentale, Faculté de Médecine et des Sciences de la Santé, EA 4324 Laboratoire de Physiologie ORPHY, 29200 Brest, France
| | - Feten Zar Kalai
- Centre de Biotechnologie de Borj-Cédria, LR15CBBC06 Laboratoire des Plantes Aromatiques et Médicinales, BP 901, 2050 Hammam-Lif, Tunisia
| | - Marie-Agnès Giroux-Metges
- Université de Bretagne Occidentale, Faculté de Médecine et des Sciences de la Santé, EA 4324 Laboratoire de Physiologie ORPHY, 29200 Brest, France
| | - Riadh Ksouri
- Centre de Biotechnologie de Borj-Cédria, LR15CBBC06 Laboratoire des Plantes Aromatiques et Médicinales, BP 901, 2050 Hammam-Lif, Tunisia
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Bouzenna H, Hfaiedh N, Giroux-Metges MA, Elfeki A, Talarmin H. Potential protective effects of alpha-pinene against cytotoxicity caused by aspirin in the IEC-6 cells. Biomed Pharmacother 2017; 93:961-968. [PMID: 28724214 DOI: 10.1016/j.biopha.2017.06.031] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [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: 02/27/2017] [Revised: 06/04/2017] [Accepted: 06/09/2017] [Indexed: 12/12/2022] Open
Abstract
Alpha-pinene is a key compound of the essential oils extracted from many species of coniferous trees. It is known for its biological activities. The aim of the present study was to determine the preventive effect of alpha-pinene on aspirin-induced toxicity in vitro, using IEC-6 cells, and to investigate its antioxidant activities. The antioxidant activities were determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP). The cytotoxicity and oxidative stress were detected by cell viability, antioxidant enzyme activity, malondialdehyde (MDA) and GSH production, and the activation of MAPK pathways. The results indicated that alpha-pinene revealed an important antioxidant activity. It was evaluated by DPPH test (EC50=310±10μg/mL) and FRAP test (EC50=238±18.92μg/mL). The co-exposure of alpha-pinene with aspirin on cells significantly increased the survival of cells and the level of GSH, and decreased the levels of MDA and total SOD and the activity of Mn-SOD. In addition, the activation of p38 and JNK was blocked by alpha-pinene. Therefore, these findings suggest that alpha-pinene can protect IEC-6 cells against aspirin-induced oxidative stress.
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Affiliation(s)
- Hafsia Bouzenna
- Laboratory ORPHY EA4324, UFR Sciences et Technique, Université de Bretagne, Occidentale 6 Avenue Le gorgeu, CS 93837, 29238 Brest Cedex 3, France; Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax, Road Soukra km 3.5 - PB n° 1171-3000, Sfax, Tunisia; Laboratory of Animal Eco Physiology, Faculty of Sciences of Gafsa, 2112, Tunisia.
| | - Najla Hfaiedh
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax, Road Soukra km 3.5 - PB n° 1171-3000, Sfax, Tunisia; Laboratory of Animal Eco Physiology, Faculty of Sciences of Gafsa, 2112, Tunisia
| | - Marie-Agnès Giroux-Metges
- Laboratory ORPHY EA4324, UFR Sciences et Technique, Université de Bretagne, Occidentale 6 Avenue Le gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Abdelfattah Elfeki
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax, Road Soukra km 3.5 - PB n° 1171-3000, Sfax, Tunisia
| | - Hélène Talarmin
- Laboratory ORPHY EA4324, UFR Sciences et Technique, Université de Bretagne, Occidentale 6 Avenue Le gorgeu, CS 93837, 29238 Brest Cedex 3, France
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Bouzenna H, Hfaiedh N, Giroux-Metges MA, Elfeki A, Talarmin H. Protective effects of essential oil of Citrus limon against aspirin-induced toxicity in IEC-6 cells. Appl Physiol Nutr Metab 2017; 42:479-486. [PMID: 28177735 DOI: 10.1139/apnm-2016-0515] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Aspirin, one of the widely used nonsteroidal anti-inflammatory drugs, is the most highly consumed pharmaceutical product in the world. However, it has several side effects in cells. This study was designed to investigate the antioxidative activity and cytoprotective effects of essential oil of Citrus limon (EOC) extracted from leaves against aspirin-induced damages in the rat small intestine epithelial cells (IEC-6). Biochemical indicators were used to assess cytotoxicity and oxidative damages caused by aspirin treatment on IEC-6. Our results showed that the chemical characterization of EOC identified 25 compounds representing 98.19% of the total oil. The major compounds from this oil were z-citral (53.21%), neryl acetate (13.06%), geranyl acetate (10.33%), and limonene (4.23%). Aspirin induced a decrease in cell viability as well as an increase in superoxide dismutase (SOD) and catalase (CAT) activities. Contrariwise, the co-exposure of cells to aspirin and EOC alleviated every above syndrome by an increase in cell survival and decrease in SOD and CAT activities. In conclusion, the essential oil of C. limon has a potent cytoprotective effect against aspirin-induced toxicity in IEC-6 cells.
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Affiliation(s)
- Hafsia Bouzenna
- a Physiology Department-EA1274, Faculty of Medicine and Health Sciences, University of Western Brittany, 22 Avenue Camille Desmoulins, CS 93837, 29238 Brest Cedex 3, France
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences Sfax, Road Soukra km 3.5, PB no 171-3000, Sfax-Tunisia
- c Laboratory of Animal Eco Physiology, Faculty of Sciences of Gafsa, 2112, Tunisia
| | - Najla Hfaiedh
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences Sfax, Road Soukra km 3.5, PB no 171-3000, Sfax-Tunisia
- c Laboratory of Animal Eco Physiology, Faculty of Sciences of Gafsa, 2112, Tunisia
| | - Marie-Agnès Giroux-Metges
- a Physiology Department-EA1274, Faculty of Medicine and Health Sciences, University of Western Brittany, 22 Avenue Camille Desmoulins, CS 93837, 29238 Brest Cedex 3, France
| | - Abdelfattah Elfeki
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences Sfax, Road Soukra km 3.5, PB no 171-3000, Sfax-Tunisia
| | - Hélène Talarmin
- a Physiology Department-EA1274, Faculty of Medicine and Health Sciences, University of Western Brittany, 22 Avenue Camille Desmoulins, CS 93837, 29238 Brest Cedex 3, France
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Talarmin H, Derbré F, Lefeuvre-Orfila L, Léon K, Droguet M, Pennec JP, Giroux-Metgès MA. The diaphragm is better protected from oxidative stress than hindlimb skeletal muscle during CLP-induced sepsis. Redox Rep 2016; 22:218-226. [PMID: 27595775 DOI: 10.1080/13510002.2016.1223793] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES The aim of this study was to determine whether non-lethal sepsis induced by cecal ligation and puncture (CLP) modulates oxidative damage and enzymatic antioxidant defenses in diaphragm and hindlimb skeletal muscles (soleus and Extensor Digitorus Longus (EDL)). METHODS Female Wistar rats were divided into four experimental groups: (1) control animals, (2) animals sacrificed 2 hours or (3) 7 days after CLP, and (4) sham-operated animals. At the end of the experimental procedure, EDL, soleus, and diaphragm muscles were harvested and 4-hydroxynonenal (HNE)-protein adducts and protein carbonyl contents were examined in relation to superoxide dismutase and catalase expression and activities. RESULTS We observed that both non-respiratory oxidative (i.e. soleus) and glycolytic skeletal muscles (i.e. EDL) are more susceptible to sepsis-induced oxidative stress than diaphragm, as attested by an increase in 4-HNE protein adducts and carbonylated proteins after 2 hours of CLP only in soleus and EDL. DISCUSSION These differences could be explained by higher basal enzymatic antioxidant activities in diaphragm compared to hindlimb skeletal muscles. Together, these results demonstrate that diaphragm is better protected from oxidative stress than hindlimb skeletal muscles during CLP-induced sepsis.
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Affiliation(s)
- Hélène Talarmin
- a Physiology Department EA1274, UFR Médecine et Sciences de la Santé , Université de Bretagne Occidentale , Brest , France
| | - Frédéric Derbré
- b "Movement Sport and Health Sciences" Laboratory EA1274 , University Rennes 2-ENS Rennes , Bruz , France
| | - Luz Lefeuvre-Orfila
- b "Movement Sport and Health Sciences" Laboratory EA1274 , University Rennes 2-ENS Rennes , Bruz , France
| | - Karelle Léon
- a Physiology Department EA1274, UFR Médecine et Sciences de la Santé , Université de Bretagne Occidentale , Brest , France
| | - Mickaël Droguet
- a Physiology Department EA1274, UFR Médecine et Sciences de la Santé , Université de Bretagne Occidentale , Brest , France
| | - Jean-Pierre Pennec
- a Physiology Department EA1274, UFR Médecine et Sciences de la Santé , Université de Bretagne Occidentale , Brest , France
| | - Marie-Agnès Giroux-Metgès
- a Physiology Department EA1274, UFR Médecine et Sciences de la Santé , Université de Bretagne Occidentale , Brest , France
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Bouzenna H, Samout N, Amani E, Mbarki S, Tlili Z, Rjeibi I, Elfeki A, Talarmin H, Hfaiedh N. Protective Effects of Pinus halepensis L. Essential Oil on Aspirin-induced Acute Liver and Kidney Damage in Female Wistar Albino Rats. J Oleo Sci 2016; 65:701-12. [DOI: 10.5650/jos.ess15287] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Hafsia Bouzenna
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax
- Laboratory Animal Eco Physiology, Faculty of Sciences of Gafsa
- EA 1274, Faculté de Médecine et Sciences de la Santé, Université de Bretagne Occidentale
| | - Noura Samout
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax
- Laboratory Animal Eco Physiology, Faculty of Sciences of Gafsa
| | - Etaya Amani
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax
- Laboratory Animal Eco Physiology, Faculty of Sciences of Gafsa
| | - Sakhria Mbarki
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax
- Laboratory Animal Eco Physiology, Faculty of Sciences of Gafsa
| | - Zied Tlili
- Department of Quantitative and Computational Medthods, the Higher Institute of Business Administration of Gafsa, Campus Universitaire Sidi Ahmed Zarroug
| | - Ilhem Rjeibi
- Laboratory Animal Eco Physiology, Faculty of Sciences of Gafsa
| | - Abdelfattah Elfeki
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax
| | - Hélène Talarmin
- EA 1274, Faculté de Médecine et Sciences de la Santé, Université de Bretagne Occidentale
| | - Najla Hfaiedh
- Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling, Faculty of Sciences of Sfax
- Laboratory Animal Eco Physiology, Faculty of Sciences of Gafsa
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Gargouri M, Magné C, Dauvergne X, Ksouri R, El Feki A, Metges MAG, Talarmin H. Cytoprotective and antioxidant effects of the edible halophyte Sarcocornia perennis L. (swampfire) against lead-induced toxicity in renal cells. Ecotoxicol Environ Saf 2013; 95:44-51. [PMID: 23755863 DOI: 10.1016/j.ecoenv.2013.05.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [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: 03/31/2013] [Revised: 05/08/2013] [Accepted: 05/10/2013] [Indexed: 06/02/2023]
Abstract
Lead (Pb) exposure is considered as a risk factor responsible for renal impairment in humans. On the other hand, the halophyte Sarcocornia perennis is a fresh vegetable crop suitable for leafy vegetable production. This study was designed to evaluate the in vitro protective activity of S. perennis against lead-induced damages in HEK293 kidney cells. Morphological and biochemical indicators were used to assess cytotoxicity and oxidative damages caused by Pb treatment on the cells. Our results showed that lead induced (1) a decrease in cell viability (MTT), (2) cell distortion and cohesion loss, (3) superoxide anion production and lipid peroxidation. Conversely, addition of S. perennis extract to the lead-containing medium alleviated every above syndrome. Thus, cell survival was increased and the production of reactive oxygen species caused by Pb treatment was inhibited. Taken together, our study revealed that S. perennis has potent cytoprotective effect against Pb-induced toxicity in HEK 293 cell. Such action would proceed through the decrease in ROS levels and resulting oxidative stress, which suggests a potential interest of this halophyte in the treatment of oxidative-stress related diseases.
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Affiliation(s)
- Manel Gargouri
- Laboratoire d'Ecophysiologie Animale, Faculté des Sciences de Sfax, Sfax, Tunisia.
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Gueret G, Guillouet M, Vermeersch V, Guillard E, Talarmin H, Nguyen BV, Rannou F, Giroux-Metges MA, Pennec JP, Ozier Y. [ICU acquired neuromyopathy]. ACTA ACUST UNITED AC 2013; 32:580-91. [PMID: 23958176 DOI: 10.1016/j.annfar.2013.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 12/15/2012] [Accepted: 05/08/2013] [Indexed: 12/19/2022]
Abstract
ICU acquired neuromyopathy (IANM) is the most frequent neurological pathology observed in ICU. Nerve and muscle defects are merged with neuromuscular junction abnormalities. Its physiopathology is complex. The aim is probably the redistribution of nutriments and metabolism towards defense against sepsis. The main risk factors are sepsis, its severity and its duration of evolution. IANM is usually diagnosed in view of difficulties in weaning from mechanical ventilation, but electrophysiology may allow an earlier diagnosis. There is no curative therapy, but early treatment of sepsis, glycemic control as well as early physiotherapy may decrease its incidence. The outcomes of IANM are an increase in morbi-mortality and possibly long-lasting neuromuscular abnormalities as far as tetraplegia.
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Affiliation(s)
- G Gueret
- Pôle anesthésie réanimations soins intensifs blocs opératoires urgences (ARSIBOU), CHRU de Brest, boulevard Tanguy-Prigent, 29200 Brest, France; Laboratoire de physiologie, faculté de médecine et des sciences de la santé, EA 1274 (mouvement, sport santé), université de Bretagne-Occidentale, 22, avenue Camille-Desmoulins, 29200 Brest, France; Université européenne de Bretagne, 5, boulevard Laennec, 35000 Rennes, France.
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Hanana H, Talarmin H, Pennec JP, Droguet M, Morel J, Dorange G. Effect of okadaic acid on cultured clam heart cells: involvement of MAPkinase pathways. Biol Open 2012; 1:1192-9. [PMID: 23259053 PMCID: PMC3522880 DOI: 10.1242/bio.20122170] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Accepted: 06/26/2012] [Indexed: 01/13/2023] Open
Abstract
Okadaic acid (OA) is one of the main diarrhetic shellfish poisoning toxins and a potent inhibitor of protein phosphatases 1 and 2A. The downstream signal transduction pathways following the protein phosphatase inhibition are still unknown and the results of most of the previous studies are often conflicting. The aim of the present study was to evaluate the effects of OA on heart clam cells and to analyse its possible mechanisms of action by investigating the signal transduction pathways involved in OA cytotoxicity. We showed that OA at 1 µM after 24 h of treatment induces disorganization of the actin cytoskeleton, rounding and detachment of fibroblastic cells. Moreover, treatment of heart cells revealed a sequential activation of MAPK proteins depending on the OA concentration. We suggest that the duration of p38 and JNK activation is a critical factor in determining cell apoptosis in clam cardiomyocytes. In the opposite, ERK activation could be involved in cell survival. The cell death induced by OA is a MAPK modulated pathway, mediated by caspase 3-dependent mechanism. OA was found to induce no significant effect on spontaneous beating rate or inward L-type calcium current in clam cardiomyocytes, suggesting that PP1 was not inhibited even by the highest dose of OA.
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Affiliation(s)
- Houda Hanana
- EA 1274, Université Européenne de Bretagne, Université de Bretagne Occidentale, Faculté de medecine , 22 Avenue Camille Desmoulins, 29238 Brest Cedex 3 , France
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Châtel A, Talarmin H, Hamer B, Schröder HC, Müller WEG, Dorange G. MAP kinase cell signaling pathway as biomarker of environmental pollution in the sponge Suberites domuncula. Ecotoxicology 2011; 20:1727-1740. [PMID: 21656160 DOI: 10.1007/s10646-011-0706-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/29/2011] [Indexed: 05/30/2023]
Abstract
In the present study, we analyzed the effects of two major pollutants of the environment, tributyltin (TBT) and water-accommodated fraction (WAF) of diesel oil, on MAP kinase activation, apoptosis induction and DNA damage, in the marine sponge Suberites domuncula. Our results clearly demonstrated a differential activation of the MAPKs depending on the chemicals tested. TBT induced the activation of p38 and JNK while diesel oil enhanced activation of both ERK and p38. The activation of MAPKs was observed after 1 h exposure and 6 and 24 h of recovery in seawater. In addition, DNA fragmentation, assessed by two techniques, the Fast micromethod(®) and the TUNEL assay, was detected after sponges were treated with both chemicals. Moreover, the study of caspase 3/7 activity showed that apoptosis was induced and triggered with all concentrations of TBT but only at high diesel oil concentrations. After TBT exposure, a correlation was observed between JNK activation, caspase 3 activity and DNA damage while p38 activation followed the two latter parameters at high concentrations of diesel oil, suggesting that sponges enhanced a specific apoptotic pathway depending on the xenobiotic tested. This study demonstrated a high signal response by the sponge Suberites domuncula to the tested chemicals. Cell signaling pathway studies may thus be of use in water quality biomonitoring programs.
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Affiliation(s)
- A Châtel
- EA 4326, Facteurs Nerveux et Structuration Tissulaire, Faculté de Médecine, Université de Bretagne Occidentale, 22 Avenue Camille Desmoulins, 29609, Brest Cedex, France.
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Châtel A, Hamer B, Jakšić Z, Vucelić V, Talarmin H, Dorange G, Schröder HC, Müller WEG. Induction of apoptosis in mussel Mytilus galloprovincialis gills by model cytotoxic agents. Ecotoxicology 2011; 20:2030-2041. [PMID: 21805215 DOI: 10.1007/s10646-011-0746-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/12/2011] [Indexed: 05/31/2023]
Abstract
Apoptosis signaling pathway was investigated in the marine mussel Mytilus galloprovincialis exposed to various stressors. Analyses were performed in mussels exposed to two major pollutants of the aquatic environment: tributyltin and the water soluble fraction of diesel oil, for 1 h and animals were then maintained in sea water for a recovery period of 6 and 24 h. Apoptosis was evaluated at several levels of the cell signaling cascade by measuring Bcl-xS expression, caspase-3 activity and DNA damage (Fast micromethod(®) and TUNEL techniques). H(2)O(2) was used as a control of apoptosis induction for validation of the assays. Results showed an induction of Bcl-xS expression, a protein implicated in apoptosis, after 1 h exposure to all concentrations of chemicals. Moreover, in the same manner, apoptotic DNA damage was induced with all chemicals tested. Besides, caspase 3 activity was detected after 1 h exposure to low doses of TBT and diesel oil while the high concentrations induced this protein after 6 h. The achieved data were also correlated with our previous study, demonstrating an induction of the mitogen-activated protein kinase (MAPK) activity in the mussel M. galloprovincialis exposed to the same conditions. In conclusion, this study was one of the first characterizing the MAP kinase cell signaling pathway leading to apoptosis in the mussel M. galloprovincialis exposed to chemicals. It showed for the first time that the Bcl-xS protein was present in these mussels as in other species and played a role in apoptosis mediation. Moreover, the main originality of this work was that it showed that two apoptotic pathways might be present in the mussel: a caspase 3-dependent and a caspase 3-independent pathways.
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Affiliation(s)
- A Châtel
- EA 4326 Facteurs nerveux et structuration tissulaire, Université de Bretagne Occidentale, 22 avenue Camille Desmoulins, 29609, Brest cedex, France.
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Hanana H, Talarmin H, Pennec JP, Droguet M, Gobin E, Marcorelle P, Dorange G. Establishment of functional primary cultures of heart cells from the clam Ruditapes decussatus. Cytotechnology 2011; 63:295-305. [PMID: 21424582 DOI: 10.1007/s10616-011-9347-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Accepted: 02/26/2011] [Indexed: 11/25/2022] Open
Abstract
Heart cells from the clam Ruditapes decussatus were routinely cultured with a high level of reproducibility in sea water based medium. Three cell types attached to the plastic after 2 days and could be maintained in vitro for at least 1 month: epithelial-like cells, round cells and fibroblastic cells. Fibroblastic cells were identified as functional cardiomyocytes due to their spontaneous beating, their ultrastructural characteristics and their reactivity with antibodies against sarcomeric α-actinin, sarcomeric tropomyosin, myosin and troponin T-C. Patch clamp measurements allowed the identification of ionic currents characteristic of cardiomyocytes: a delayed potassium current (I (K slow)) strongly suppressed (95%) by tetraethylammonium (1 mM), a fast inactivating potassium current (I (K fast)) inhibited (50%) by 4 amino-pyridine at 1 mM and, at a lower level (34%) by TEA, a calcium dependent potassium current (I (KCa)) activated by strong depolarization. Three inward voltage activated currents were also characterized in some cardiomyocytes: L-type calcium current (I (Ca)) inhibited by verapamil at 5 × 10(-4) M, T-type Ca(2+) current, rapidly activated and inactivated, and sodium current (I (Na)) observed in only a few cells after strong hyperpolarization. These two currents did not seem to be physiologically essential in the initiation of the beatings of cardiomyocytes. Potassium currents were partially inhibited by tributyltin (TBT) (1 μM) but not by okadaic acid (two marine pollutants). DNA synthesis was also demonstrated in few cultured cells using BrdU (bromo-2'-deoxyuridine). Observed effects of okadaic acid and TBT demonstrated that cultured heart cells from clam Ruditapes decussatus can be used as an experimental model in marine toxicology.
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Affiliation(s)
- H Hanana
- Faculté de médecine, EA 4326, Université Européenne de Bretagne, Université de Bretagne Occidentale, 22 Avenue Camille Desmoulins, 29238, Brest Cedex 3, France,
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Châtel A, Hamer B, Talarmin H, Dorange G, Schröder HC, Müller WEG. Activation of MAP kinase signaling pathway in the mussel Mytilus galloprovincialis as biomarker of environmental pollution. Aquat Toxicol 2010; 96:247-255. [PMID: 19948362 DOI: 10.1016/j.aquatox.2009.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 10/29/2009] [Accepted: 11/03/2009] [Indexed: 05/28/2023]
Abstract
Stimulation of MAP kinase signal transduction pathway by various stressful stimuli was investigated in the marine bivalve Mytilus galloprovincialis. Analyses were performed in animals exposed in laboratory to selected pollutants and in mussels collected in winter and summer along the eastern Adriatic coast (Croatia). Effects of oxidative stress, induced by tributyltin, hydrogen peroxide and water soluble fraction of diesel fuel on the activation/phosphorylation of the three Mitogen-Activated Protein Kinases (MAPKs) p38, JNK and ERK using a newly developed ELISA procedure were evaluated. MAP kinase activation was analyzed 1h after exposure of mussels to chemical agents, and after recovery periods of 6 and 24h. Our results clearly indicated that pollutants generated different patterns of induction of the MAPK phosphorylation. Indeed, only pp38 and pJNK were activated with 11, 33 and 100 microg/L TBT, reaching a maximum activation after 6h in seawater following treatment of mussels with 11 microg/L TBT. Treatment with 0.074 and 0.222 mM H2O2 enhanced activation of both p38 and ERK. These two kinases were activated after 1h exposure, followed by a diminution after 6h of recovery in seawater and a reactivation after 24h. The levels of phosphorylated P38 and JNK were increased after mussel exposure with 7.5, 15 and 30% of water soluble fraction of diesel oil. P38 was activated concentration dependently at 1h exposure. Additionally, field study pointed out seasonal differences in MAP kinases activation as mussels collected during summer had a higher enzyme activation state than in winter, as well as sampling site differences which could be correlated to the industrial/tourism activity and environmental stresses (salinity). All the results converge towards MAP kinase signaling pathway being induced by various pollutants in M. galloprovincialis. This signaling cascade should be considered as a possible biomarker of environmental stress and pollution.
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Affiliation(s)
- A Châtel
- EA 4326 Facteurs Nerveux et Structuration Tissulaire, Institut de Synergie des Sciences et de la Santé, 22 Avenue Camille Desmoulins C.S. 93837, 29238 Brest Cedex 03, France.
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Meot-Duros L, Cérantola S, Talarmin H, Le Meur C, Le Floch G, Magné C. New antibacterial and cytotoxic activities of falcarindiol isolated in Crithmum maritimum L. leaf extract. Food Chem Toxicol 2009; 48:553-7. [PMID: 19922760 DOI: 10.1016/j.fct.2009.11.031] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [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: 07/15/2009] [Revised: 10/09/2009] [Accepted: 11/09/2009] [Indexed: 11/19/2022]
Abstract
Bioassay-guided fractionation of a chloroformic extract obtained from Crithmum maritimum leaves led to the chemical isolation of falcarindiol, a polyacetylene widely distributed within the Apiaceae family. Structure of this compound was confirmed by NMR and activity was tracked using a screening microplate bioassay. Falcarindiol strongly inhibited the growth of Micrococcus luteus and Bacillus cereus, with a minimum inhibitory concentration (MIC) value of 50 microg ml(-1). Moreover, this compound showed cytotoxicity against IEC-6 cells with an IC50 value of 20 microM after 48 h of exposition. These results suggest that Crithmum maritimum could be potentially used in food manufactures and cosmetology as preservative agents and biopesticides, or in medicine as new antibiotics, confirming the interest in studying halophytic species as sources of bioactive compounds.
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Affiliation(s)
- Laetitia Meot-Duros
- Laboratoire d'Ecophysiologie et de Biotechnologie des Halophytes et des Algues Marines, EA 3877 (LEBHAM), Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, Technopôle Brest Iroise, Place Nicolas Copernic, 29280 Plouzané, France.
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Rossignol B, Gueret G, Pennec JP, Morel J, Giroux-Metges MA, Talarmin H, Arvieux CC. Effects of chronic sepsis on the voltage-gated sodium channel in isolated rat muscle fibers. Crit Care Med 2007; 35:351-7. [PMID: 17205014 DOI: 10.1097/01.ccm.0000254335.88023.0e] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Physiopathology of critical illness polyneuromyopathy was investigated in several animal-based models. Electrophysiologic approach was achieved in denervated and corticosteroid-induced myopathy; other models based on sepsis or inflammatory factors (zymosan, cytokines) were also used but did not consider voltage-gated sodium channel implication in neuromuscular weakness. We have studied electrophysiologic effects of chronic sepsis on an intact neuromuscular rat model with special consideration to the subtypes of sodium channels involved. DESIGN Experimental animal study. SETTING University laboratory. SUBJECTS Wistar rats. INTERVENTIONS Chronic sepsis was achieved by a technique of cecal ligature and needle perforation. Ten days after surgery, the rats were killed. Fast-twitch flexor digitorum brevis was excised and dissociated in 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid-buffered saline supplemented with 3.0 mg/mL collagenase. Fast sodium currents were recorded by a macropatch clamp technique at room temperature (22+/-2 degrees C) in a cell-attached configuration. MEASUREMENTS AND MAIN RESULTS A decrease in maximal sodium current and in conductance was evidenced without modification of the sodium Nernst potential. A shift of the voltage inactivation curve toward more negative potentials could explain the observed decrease in excitability. In parallel, we observed an up-regulation of NaV 1.5-type sodium channels. CONCLUSIONS Chronic inflammation and sepsis induced modifications of sodium channel properties that could contribute to muscular inexcitability. This inexcitability can be elicited by a modification of properties or type of voltage-gated sodium channels. Our results lead us to explain this inexcitability by an up-regulation of NaV 1.5 sodium channel.
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Affiliation(s)
- Benoit Rossignol
- Département d'Anesthésie Réanimation, University Hospital of Brest, Brest, France
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Giroux-Metges MA, Pennec JP, Petit J, Morel J, Talarmin H, Droguet M, Dorange G, Gioux M. Effects of immobilizing a single muscle on the morphology and the activation of its muscle fibers. Exp Neurol 2005; 194:495-505. [PMID: 16022874 DOI: 10.1016/j.expneurol.2005.03.008] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2004] [Revised: 01/10/2005] [Accepted: 03/22/2005] [Indexed: 11/18/2022]
Abstract
A single muscle of Wistar female rats, either soleus or peroneus longus, was immobilized by fixing its cut distal tendon to the bone during 8 weeks. We observed a transitory weight loss in both muscles; the mean fiber cross-sectional area (CSA) showed a reduction at day 30, followed by an increase at day 60. The time course of the activation of the immobilized muscle was evaluated by recording the chronic electromyographic (EMG) activity during short periods (1 min every other day) of treadmill locomotion. During immobilization, the integrated EMG amplitude of the soleus increased, reaching a maximum at 4 weeks, but remained close to control values during 8 weeks for the peroneus. The median frequency (MF) of the power density spectrum of the soleus EMG was not statistically different between immobilized and control muscles, while MF of the immobilized peroneus EMG was permanently higher than that of control muscles. This suggests two different modes of adaptation in motor unit command, depending on the muscle profile, which could be concomitant with the restoration of muscle fibers CSA after 8 weeks.
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Affiliation(s)
- Marie-Agnès Giroux-Metges
- Laboratoire de Physiologie, Faculté de médecine, 22 Avenue Camille Desmoulins, CS 93837, 29238 BREST Cedex 3, France
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Pennec JP, Talarmin H, Droguet M, Giroux-Metgès MA, Gioux M, Dorange G. Characterization of the voltage-activated currents in cultured atrial myocytes isolated from the heart of the common oysterCrassostrea gigas. J Exp Biol 2004; 207:3935-44. [PMID: 15472024 DOI: 10.1242/jeb.01221] [Citation(s) in RCA: 11] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
SUMMARYUsing the macro-patch clamp technique, we show that cardiac myocytes isolated from the heart of the oyster Crassostrea gigas possess several types of voltage-activated ionic currents. (1) A classical non-inactivating potassium current of the IK type that is inhibited by tetraethyl ammonium and shows an outward rectification and a slow activation. (2) A potassium current of the IA type that shows rapid activation and inactivation, and is blocked by 4-amino pyridine or preliminary depolarisation. (3) A potassium calcium-dependent current that is inhibited by charybdotoxin, activated by strong depolarisations and shows a large conductance. (4) A calcium inward current of the L-type that is inhibited by verapamil, cobalt and high concentrations of cadmium. This current is identified in most cells, but a T-type calcium current and classical fast sodium current are only identified in few cells, and only after a strong hyperpolarizing pulse. This suggests that these channels are normally inactivated in cultured cells and are not involved in the spontaneous activity of these cells. When they exist, the fast sodium channel is blocked by tetrodotoxin. The L-type calcium conductance is increased by serotonin. The identification in cultured oyster atrial cells of classical ionic currents,which are observed in most vertebrate species but only in a few species of molluscs, demonstrates that these cells are an interesting model. Moreover the viability and the electrophysiological properties of these cells are not significantly modified by freezing and thawing, thus increasing their usefulness in various bioassays.
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Affiliation(s)
- Jean-Pierre Pennec
- EA 3879, Unité de Physiologie Comparée et Intégrative, Institut de Synergie des Sciences et de la Santé, 22 avenue Camille Desmoulins, CS93837, 29238, Brest-cedex 3, France.
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Rescan C, Coutant A, Talarmin H, Theret N, Glaise D, Guguen-Guillouzo C, Baffet G. Mechanism in the sequential control of cell morphology and S phase entry by epidermal growth factor involves distinct MEK/ERK activations. Mol Biol Cell 2001; 12:725-38. [PMID: 11251083 PMCID: PMC30976 DOI: 10.1091/mbc.12.3.725] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.0] [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: 01/02/2023] Open
Abstract
Cell shape plays a role in cell growth, differentiation, and death. Herein, we used the hepatocyte, a normal, highly differentiated cell characterized by a long G1 phase, to understand the mechanisms that link cell shape to growth. First, evidence was provided that the mitogen-activated protein kinase kinase (MEK)/extracellular signal-regulated kinase (ERK) cascade is a key transduction pathway controlling the hepatocyte morphology. MEK2/ERK2 activation in early G1 phase did not lead to cell proliferation but induced cell shape spreading and demonstration was provided that this MAPK-dependent spreading was required for reaching G1/S transition and DNA replication. Moreover, epidermal growth factor (EGF) was found to control this morphogenic signal in addition to its mitogenic effect. Thus, blockade of cell spreading by cytochalasin D or PD98059 treatment resulted in inhibition of EGF-dependent DNA replication. Our data led us to assess the first third of G1, is exclusively devoted to the growth factor-dependent morphogenic events, whereas the mitogenic signal occurred at only approximately mid-G1 phase. Moreover, these two growth factor-related sequential signaling events involved successively activation of MEK2-ERK2 and then MEK1/2-ERK1/2 isoforms. In addition, we demonstrated that inhibition of extracellular matrix receptor, such as integrin beta1 subunit, leads to cell arrest in G1, whereas EGF was found to up-regulated integrin beta1 and fibronectin in a MEK-ERK-dependent manner. This process in relation to cytoskeletal reorganization could induce hepatocyte spreading, making them permissive for DNA replication. Our results provide new insight into the mechanisms by which a growth factor can temporally control dual morphogenic and mitogenic signals during the G1 phase.
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Affiliation(s)
- C Rescan
- Institut National de la Santé et de la Recherche Médicale U522, Unité de Recherches Hépatologiques, Institut Fédératif de Recherche 97, Hôpital Pontchaillou, 35033 Rennes, France
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Talarmin H, Rescan C, Cariou S, Glaise D, Zanninelli G, Bilodeau M, Loyer P, Guguen-Guillouzo C, Baffet G. The mitogen-activated protein kinase kinase/extracellular signal-regulated kinase cascade activation is a key signalling pathway involved in the regulation of G(1) phase progression in proliferating hepatocytes. Mol Cell Biol 1999; 19:6003-11. [PMID: 10454547 PMCID: PMC84483 DOI: 10.1128/mcb.19.9.6003] [Citation(s) in RCA: 216] [Impact Index Per Article: 8.6] [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: 11/20/2022] Open
Abstract
In this study, activation of the mitogen-activated protein kinase kinase (MEK)/extracellular signal-regulated kinase (ERK) signalling pathway was analyzed in proliferating rat hepatocytes both in vivo after partial hepatectomy and in vitro following epidermal growth factor (EGF)-pyruvate stimulation. First, a biphasic MEK/ERK activation was evidenced in G(1) phase of hepatocytes from regenerating liver but not from sham-operated control animals. One occurred in early G(1) (30 min to 4 h), and the other occurred in mid-late G(1), peaking at around 10.5 h. Interestingly, the mid-late G(1) activation peak was located just before cyclin D1 induction in both in vivo and in vitro models. Second, the biological role of the MEK/ERK cascade activation in hepatocyte progression through the G(1)/S transition was assessed by adding a MEK inhibitor (PD 98059) to EGF-pyruvate-stimulated hepatocytes in primary culture. In the presence of MEK inhibitor, cyclin D1 mRNA accumulation was inhibited, DNA replication was totally abolished, and the MEK1 isoform was preferentially targeted by this inhibition. This effect was dose dependent and completely reversed by removing the MEK inhibitor. Furthermore, transient transfection of hepatocytes with activated MEK1 construct resulted in increased cyclin D1 mRNA accumulation. Third, a correlation between the mid-late G(1) MEK/ERK activation in hepatocytes in vivo after partial hepatectomy and the mitogen-independent proliferation capacity of these cells in vitro was established. Among hepatocytes isolated either 5, 7, 9, 12 or 15 h after partial hepatectomy, only those isolated from 12- and 15-h regenerating livers were able to replicate DNA without additional growth stimulation in vitro. In addition, PD 98059 intravenous administration in vivo, before MEK activation, was able to inhibit DNA replication in hepatocytes from regenerating livers. Taken together, these results show that (i) early induction of the MEK/ERK cascade is restricted to hepatocytes from hepatectomized animals, allowing an early distinction of primed hepatocytes from those returning to quiescence, and (ii) mid-late G(1) MEK/ERK activation is mainly associated with cyclin D1 accumulation which leads to mitogen-independent progression of hepatocytes to S phase. These results allow us to point to a growth factor dependency in mid-late G(1) phase of proliferating hepatocytes in vivo as observed in vitro in proliferating hepatocytes and argue for a crucial role of the MEK/ERK cascade signalling pathway.
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Affiliation(s)
- H Talarmin
- INSERM U 522, Unité de Recherches Hépatologiques, Hôpital Pontchaillou, 35033 Rennes, France
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Bilodeau M, Talarmin H, Ilyin G, Rescan C, Glaise D, Cariou S, Loyer P, Guguen-Guillouzo C, Baffet G. Skp2 induction and phosphorylation is associated with the late G1 phase of proliferating rat hepatocytes. FEBS Lett 1999; 452:247-53. [PMID: 10386600 DOI: 10.1016/s0014-5793(99)00629-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [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: 11/19/2022]
Abstract
The changes in phosphoproteins purified with the affinity peptide p9CKShs1 were analyzed from extracts of regenerating rat livers in order to define some G1 and G1/S regulations characteristic of mature hepatocytes stimulated to proliferate. We observed a 47 kDa phosphoprotein that occurred first at the end of G1 before peaking in the S phase. P47 was also found to be phosphorylated in late G1 in primary hepatocyte cultures stimulated with mitogens. P47 was still phosphorylated in extracts depleted of Cdc2, but to a lesser extent after Cdk2 depletion. This phosphoprotein was identified as Skp2. (i) P47 shared the same electrophoretic mobility than Skp2, a cell cycle protein essential for S phase entry in human fibroblasts; (ii) Skp2, like P47, started to be expressed and was highly phosphorylated during the G1/S transition of hepatocytes stimulated to proliferate in vivo and in vitro; (iii) P47 was specifically immunoprecipitated by an antibody directed against Skp2. In addition, cyclin A/Cdk2 complexes from regenerating liver clearly interacted with Skp2. This is the first demonstration that Skp2 is induced and phosphorylated in the late G1 and S phase of hepatocytes in vivo in regenerating liver as well as in vitro in mitogen-stimulated hepatocytes.
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Affiliation(s)
- M Bilodeau
- INSERM U49, Unité de Recherches Hépatologiques, Hôpital Pontchaillou, Rennes, France
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