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El-Ghannam A, Sultana F, Dréau D, Tiwari A, Yang IH, AlFotawi R, Knabe-Ducheyne C. Novel 3D printed bioactive SiC orthopedic screw promotes bone growth associated activities by macrophages, neurons, and osteoblasts. J Biomed Mater Res A 2024. [PMID: 39319410 DOI: 10.1002/jbm.a.37801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2024] [Revised: 08/26/2024] [Accepted: 09/11/2024] [Indexed: 09/26/2024]
Abstract
Ceramic additive manufacturing currently relies on binders or high-energy lasers, each with limitations affecting final product quality and suitability for medical applications. To address these challenges, our laboratory has devised a surface activation technique for ceramic particles that eliminates the necessity for polymer binders or high-energy lasers in ceramic additive manufacturing. We utilized this method to 3D print bioactive SiC orthopedic screws and evaluated their properties. The study's findings reveal that chemical oxidation of SiC activated its surface, enabling 3D printing of orthopedic screws in a binder jet printer. Post-processing impregnation with NaOH and/or NH4OH strengthened the scaffold by promoting silica crystallization or partial conversion of silicon oxide into silicon nitride. The silica surface of the SiC 3D printed orthopedic screws facilitated osteoblast and neuron adhesion and extensive axon synthesis. The silicate ions released from the 3D printed SiC screws favorably modulated macrophage immune responses toward an M1 phenotype as indicated by the inhibition of TNFα secretions and of reactive oxygen species (ROS) expression along with the promotion of IL6R shedding. In contrast, under the same experimental conditions, Ti ions released from Ti6Al4V discs promoted macrophage TNFα secretion and ROS expression. In vivo tests demonstrated direct bone deposition on the SiC scaffold and a strong interfacial bond between the implanted SiC and bone. Immunostaining showed innervation, mineralization, and vascularization of the newly formed bone at the interface with SiC. Taken altogether, the 3D printed SiC orthopedic screws foster a favorable environment for wound healing and bone regeneration. The novel 3D printing method, based on ceramic surface activation represents a significant advancement in ceramic additive manufacturing and is applicable to a wide variety of materials.
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Affiliation(s)
- Ahmed El-Ghannam
- Department of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, North Carolina, USA
| | - Farjana Sultana
- Department of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, North Carolina, USA
| | - Didier Dréau
- Department of Biological Sciences, UNC Charlotte, Charlotte, North Carolina, USA
| | - Arjun Tiwari
- Department of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, North Carolina, USA
| | - In Hong Yang
- Department of Mechanical Engineering and Engineering Science, UNC Charlotte, Charlotte, North Carolina, USA
| | - Randa AlFotawi
- Department of Oral and Maxillofacial Surgery, King Saud University, Riyadh, Saudi Arabia
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2
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Subramaiyam N. Insights of mitochondrial involvement in alcoholic fatty liver disease. J Cell Physiol 2023; 238:2175-2190. [PMID: 37642259 DOI: 10.1002/jcp.31100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/31/2023] [Accepted: 08/04/2023] [Indexed: 08/31/2023]
Abstract
Alcoholic liver disease (ALD) is a global concern affecting most of the population and leading to the development of end-stage liver disease. Metabolic alterations due to increased alcohol consumption surge the hepatic accumulation of lipids and develop into a severe form of alcoholic steatohepatitis (ASH), depending on age and the consumption rate. The mitochondria in the hepatocyte actively regulate metabolic homeostasis and are disrupted in ALD pathogenesis. The increased NADH upon ethanol metabolism inhibits the mitochondrial oxidation of fatty acids, alters oxidative phosphorylation, and favors de novo lipogenesis. The higher mitochondrial respiration in early ALD increases free radical generation, whereas mitochondrial respiration is uncoupled in chronic ALD, affecting the cellular energy status. The defective glutathione importer due to excessive cholesterol loading and low adenosine triphosphate accounts for additional oxidative stress leading to hepatocyte apoptosis. The defective mitochondrial transcription machinery and sirtuins function in ALD affect mitochondrial function and biogenesis. The metabolites of ethanol metabolism epigenetically alter the gene expression profile of hepatic cell populations by modulating the promoters and sirtuins, aiding hepatic fibrosis and inflammation. The defect in mitophagy increases the accumulation of megamitochondria in hepatocytes and attracts immune cells by releasing mitochondrial damage-associated molecular patterns to initiate hepatic inflammation and ASH progression. Thus, maintaining mitochondrial lipid homeostasis and antioxidant capacity pharmacologically could provide a better outcome for ALD management.
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Affiliation(s)
- Nithyananthan Subramaiyam
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
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3
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Ammendolia DA, Bement WM, Brumell JH. Plasma membrane integrity: implications for health and disease. BMC Biol 2021; 19:71. [PMID: 33849525 PMCID: PMC8042475 DOI: 10.1186/s12915-021-00972-y] [Citation(s) in RCA: 96] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Accepted: 02/01/2021] [Indexed: 12/12/2022] Open
Abstract
Plasma membrane integrity is essential for cellular homeostasis. In vivo, cells experience plasma membrane damage from a multitude of stressors in the extra- and intra-cellular environment. To avoid lethal consequences, cells are equipped with repair pathways to restore membrane integrity. Here, we assess plasma membrane damage and repair from a whole-body perspective. We highlight the role of tissue-specific stressors in health and disease and examine membrane repair pathways across diverse cell types. Furthermore, we outline the impact of genetic and environmental factors on plasma membrane integrity and how these contribute to disease pathogenesis in different tissues.
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Affiliation(s)
- Dustin A Ammendolia
- Cell Biology Program, Hospital for Sick Children, 686 Bay Street PGCRL, Toronto, ON, M5G 0A4, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A1, Canada
| | - William M Bement
- Center for Quantitative Cell Imaging and Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - John H Brumell
- Cell Biology Program, Hospital for Sick Children, 686 Bay Street PGCRL, Toronto, ON, M5G 0A4, Canada. .,Department of Molecular Genetics, University of Toronto, Toronto, ON, M5S 1A1, Canada. .,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A1, Canada. .,SickKids IBD Centre, Hospital for Sick Children, Toronto, ON, M5G 0A4, Canada.
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Yan L, Li H, Xia W. Bioglass could increase cell membrane fluidity with ion products to develop its bioactivity. Cell Prolif 2020; 53:e12906. [PMID: 33043500 PMCID: PMC7653244 DOI: 10.1111/cpr.12906] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 08/21/2020] [Accepted: 08/25/2020] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVES Silicate bioactive glass (BG) has been widely demonstrated to stimulate both of the hard and soft tissue regeneration, in which ion products released from BG play important roles. However, the mechanism by which ion products act on cells on cells is unclear. MATERIALS AND METHODS Human umbilical vein endothelial cells and human bone marrow stromal cells were used in this study. Fluorescence recovery after photobleaching and generalized polarization was used to characterize changes in cell membrane fluidity. Migration, differentiation and apoptosis experiments were carried out. RNA and protein chip were detected. The signal cascade is simulated to evaluate the effect of increased cell membrane fluidity on signal transduction. RESULTS We have demonstrated that ion products released from BG could effectively enhance cell membrane fluidity in a direct and physical way, and Si ions may play a major role. Bioactivities of BG ion products on cells, such as migration and differentiation, were regulated by membrane fluidity. Furthermore, we have proved that BG ion products could promote apoptosis of injured cells based on our conclusion that BG ion products increased membrane fluidity. CONCLUSIONS This study proved that BG ion products could develop its bioactivity on cells by directly enhancing cell membrane fluidity and subsequently affected cell behaviours, which may provide an explanation for the general bioactivities of silicate material.
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Affiliation(s)
- Longxin Yan
- School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Haiyan Li
- School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Weiliang Xia
- School of Biomedical Engineering and Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China
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5
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Eldad S, Hertz R, Vainer G, Saada A, Bar-Tana J. Treatment of ErbB2 breast cancer by mitochondrial targeting. Cancer Metab 2020; 8:17. [PMID: 32695336 PMCID: PMC7362624 DOI: 10.1186/s40170-020-00223-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 07/01/2020] [Indexed: 12/14/2022] Open
Abstract
Background ErbB2 breast cancer still remains an unmet need due to primary and/or acquired resistance to current treatment strategies. MEDICA compounds consist of synthetic long-chain α,ω-dicarboxylic acids previously reported to suppress breast cancer in PyMT transgenic mice. Methods MEDICA efficacy and mode of action in the ErbB2 context was studied in ErbB2 transgenic mice and human breast cancer cells. Results MEDICA treatment is shown here to suppress ErbB2 breast tumors and lung metastasis in ErbB2/neu MMTV transgenic mice, to suppress ErbB2/neu xenografts in nod/scid mice, and to suppress survival of AU565 and BT474 human ErbB2 breast cancer cells. Suppression of ErbB2 breast tumors by MEDICA is due to lipid raft disruption with loss of ErbB family members, including EGFR, ErbB2, and ErbB3. In addition, MEDICA inhibits mTORC1 activity, independently of abrogating the ErbB receptors and their signaling cascades. The double hit of MEDICA in abrogating ErbB and mTORC1 is partly accounted for by targeting mitochondria complex I. Conclusions Mitochondrial targeting by MEDICA suppresses ErbB2 breast tumors and metastasis due to lipid raft disruption and inhibition of mTORC1 activity. Inhibition of mTORC1 activity by MEDICA avoids the resistance acquired by canonical mTORC1 inhibitors like rapalogs or mTOR kinase inhibitors.
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Affiliation(s)
- Sophia Eldad
- Dept of Human Nutrition and Metabolism, Hebrew University Medical School, 91120 Jerusalem, Israel
| | - Rachel Hertz
- Dept of Human Nutrition and Metabolism, Hebrew University Medical School, 91120 Jerusalem, Israel
| | - Gilad Vainer
- Dept of Pathology, Hadassah-Hebrew University Medical Center, 91120 Jerusalem, Israel
| | - Ann Saada
- Department of Genetics and Metabolic Diseases, Hadassah-Hebrew University Medical Center, 91120 Jerusalem, Israel
| | - Jacob Bar-Tana
- Dept of Human Nutrition and Metabolism, Hebrew University Medical School, 91120 Jerusalem, Israel
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Imran M, Sergent O, Tête A, Gallais I, Chevanne M, Lagadic-Gossmann D, Podechard N. Membrane Remodeling as a Key Player of the Hepatotoxicity Induced by Co-Exposure to Benzo[a]pyrene and Ethanol of Obese Zebrafish Larvae. Biomolecules 2018; 8:biom8020026. [PMID: 29757947 PMCID: PMC6023014 DOI: 10.3390/biom8020026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 05/04/2018] [Accepted: 05/04/2018] [Indexed: 12/11/2022] Open
Abstract
The rise in prevalence of non-alcoholic fatty liver disease (NAFLD) constitutes an important public health concern worldwide. Including obesity, numerous risk factors of NAFLD such as benzo[a]pyrene (B[a]P) and ethanol have been identified as modifying the physicochemical properties of the plasma membrane in vitro thus causing membrane remodeling—changes in membrane fluidity and lipid-raft characteristics. In this study, the possible involvement of membrane remodeling in the in vivo progression of steatosis to a steatohepatitis-like state upon co-exposure to B[a]P and ethanol was tested in obese zebrafish larvae. Larvae bearing steatosis as the result of a high-fat diet were exposed to ethanol and/or B[a]P for seven days at low concentrations coherent with human exposure in order to elicit hepatotoxicity. In this condition, the toxicant co-exposure raised global membrane order with higher lipid-raft clustering in the plasma membrane of liver cells, as evaluated by staining with the fluoroprobe di-4-ANEPPDHQ. Involvement of this membrane’s remodeling was finally explored by using the lipid-raft disruptor pravastatin that counteracted the effects of toxicant co-exposure both on membrane remodeling and toxicity. Overall, it can be concluded that B[a]P/ethanol co-exposure can induce in vivo hepatotoxicity via membrane remodeling which could be considered as a good target mechanism for developing combination therapy to deal with steatohepatitis.
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Affiliation(s)
- Muhammad Imran
- Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail)-UMR_S 1085, University of Rennes, F-35000 Rennes, France.
| | - Odile Sergent
- Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail)-UMR_S 1085, University of Rennes, F-35000 Rennes, France.
| | - Arnaud Tête
- Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail)-UMR_S 1085, University of Rennes, F-35000 Rennes, France.
| | - Isabelle Gallais
- Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail)-UMR_S 1085, University of Rennes, F-35000 Rennes, France.
| | - Martine Chevanne
- Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail)-UMR_S 1085, University of Rennes, F-35000 Rennes, France.
| | - Dominique Lagadic-Gossmann
- Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail)-UMR_S 1085, University of Rennes, F-35000 Rennes, France.
| | - Normand Podechard
- Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail)-UMR_S 1085, University of Rennes, F-35000 Rennes, France.
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Bucher S, Tête A, Podechard N, Liamin M, Le Guillou D, Chevanne M, Coulouarn C, Imran M, Gallais I, Fernier M, Hamdaoui Q, Robin MA, Sergent O, Fromenty B, Lagadic-Gossmann D. Co-exposure to benzo[a]pyrene and ethanol induces a pathological progression of liver steatosis in vitro and in vivo. Sci Rep 2018; 8:5963. [PMID: 29654281 PMCID: PMC5899096 DOI: 10.1038/s41598-018-24403-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Accepted: 04/03/2018] [Indexed: 02/07/2023] Open
Abstract
Hepatic steatosis (i.e. lipid accumulation) and steatohepatitis have been related to diverse etiologic factors, including alcohol, obesity, environmental pollutants. However, no study has so far analyzed how these different factors might interplay regarding the progression of liver diseases. The impact of the co-exposure to the environmental carcinogen benzo[a]pyrene (B[a]P) and the lifestyle-related hepatotoxicant ethanol, was thus tested on in vitro models of steatosis (human HepaRG cell line; hybrid human/rat WIF-B9 cell line), and on an in vivo model (obese zebrafish larvae). Steatosis was induced prior to chronic treatments (14, 5 or 7 days for HepaRG, WIF-B9 or zebrafish, respectively). Toxicity and inflammation were analyzed in all models; the impact of steatosis and ethanol towards B[a]P metabolism was studied in HepaRG cells. Cytotoxicity and expression of inflammation markers upon co-exposure were increased in all steatotic models, compared to non steatotic counterparts. A change of B[a]P metabolism with a decrease in detoxification was detected in HepaRG cells under these conditions. A prior steatosis therefore enhanced the toxicity of B[a]P/ethanol co-exposure in vitro and in vivo; such a co-exposure might favor the appearance of a steatohepatitis-like state, with the development of inflammation. These deleterious effects could be partly explained by B[a]P metabolism alterations.
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Affiliation(s)
- Simon Bucher
- Univ Rennes, Inserm, Inra, Institut NUMECAN (Nutrition Metabolisms and Cancer) - UMR_S 1241, UMR_A 1341, F-35000, Rennes, France
| | - Arnaud Tête
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Normand Podechard
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Marie Liamin
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Dounia Le Guillou
- Univ Rennes, Inserm, Inra, Institut NUMECAN (Nutrition Metabolisms and Cancer) - UMR_S 1241, UMR_A 1341, F-35000, Rennes, France
| | - Martine Chevanne
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Cédric Coulouarn
- Univ Rennes, Inserm, Inra, Institut NUMECAN (Nutrition Metabolisms and Cancer) - UMR_S 1241, UMR_A 1341, F-35000, Rennes, France
| | - Muhammad Imran
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Isabelle Gallais
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Morgane Fernier
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Quentin Hamdaoui
- Univ Rennes, Inserm, Inra, Institut NUMECAN (Nutrition Metabolisms and Cancer) - UMR_S 1241, UMR_A 1341, F-35000, Rennes, France
| | - Marie-Anne Robin
- Univ Rennes, Inserm, Inra, Institut NUMECAN (Nutrition Metabolisms and Cancer) - UMR_S 1241, UMR_A 1341, F-35000, Rennes, France
| | - Odile Sergent
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France
| | - Bernard Fromenty
- Univ Rennes, Inserm, Inra, Institut NUMECAN (Nutrition Metabolisms and Cancer) - UMR_S 1241, UMR_A 1341, F-35000, Rennes, France
| | - Dominique Lagadic-Gossmann
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France.
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Park JH, Lee DH, Park MS, Jung YS, Hong JT. C-C chemokine receptor type 5 deficiency exacerbates alcoholic fatty liver disease through pro-inflammatory cytokines and chemokines-induced hepatic inflammation. J Gastroenterol Hepatol 2017; 32:1258-1264. [PMID: 27859576 DOI: 10.1111/jgh.13657] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 11/15/2016] [Accepted: 11/15/2016] [Indexed: 01/29/2023]
Abstract
BACKGROUND AND AIM Chemokines and chemokine receptors implicated with alcoholic liver disease. Studies have shown that inflammation and oxidative stress induce fat molecules aggregation in liver. We evaluated the relationship between alcoholic fatty liver disease and C-C chemokine receptor 5 (CCR5) and impact of inflammation and oxidative stress in fat molecule deposition. METHODS Lieber-DeCarli diet containing ethanol or isocaloric control diets were fed to wild-type and CCR5 knockout mice for 10 days and gavaged with a single dose of ethanol or isocaloric maltose dextrin at 11th day. Cytokine, chemokine, and reactive oxygen species levels were measured in liver tissues to study the role of CCR5 in alcoholic fatty liver disease. RESULTS C-C chemokine receptor type 5 knockout mice exacerbated ethanol-induced liver injury. Serum levels of aspartate aminotransferase and alanine aminotransferase were higher in CCR5 knockout mice than wild-type mice, and CCR5 knockout mice showed more severe lipid accumulation in liver tissue than wild-type mice after ethanol feeding. Increased expressions of pro-inflammatory cytokines TNF-α and IL-6 and chemokines CCL2, CCL3, CCL4, and CCL5 result in exacerbation of hepatitis in CCR5 knockout mice after ethanol feeding. Oxidative stress induced by reactive oxygen species was more severe in CCR5 knockout mice, and increasing level of fatty acid import and decreasing level of lipid degradation resulted in lipid accumulation in ethanol-fed CCR5 knockout mice. CONCLUSION Deficiency of CCR5 exacerbates alcoholic fatty liver disease by hepatic inflammation induced by pro-inflammatory cytokines and chemokines and oxidative stress.
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Affiliation(s)
- Ju Ho Park
- College of Pharmacy and Medical Research Center, Chungbuk National University, Cheongju, Korea
| | - Dong Hun Lee
- College of Pharmacy and Medical Research Center, Chungbuk National University, Cheongju, Korea
| | - Mork Soon Park
- Raw Material Synthetic Factory, Dongkook Pharmaceutical company, Jincheon-gun, Korea
| | - Young Suk Jung
- College of Pharmacy, Pusan National University, Busan, Korea
| | - Jin Tae Hong
- College of Pharmacy and Medical Research Center, Chungbuk National University, Cheongju, Korea
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Dean M, Lassak A, Wilk A, Zapata A, Marrero L, Molina P, Reiss K. Acute Ethanol Increases IGF-I-Induced Phosphorylation of ERKs by Enhancing Recruitment of p52-Shc to the Grb2/Shc Complex. J Cell Physiol 2017; 232:1275-1286. [PMID: 27607558 PMCID: PMC5381968 DOI: 10.1002/jcp.25586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 09/06/2016] [Indexed: 12/13/2022]
Abstract
Ethanol plays a detrimental role in the development of the brain. Multiple studies have shown that ethanol inhibits insulin-like growth factor I receptor (IGF-IR) function. Because the IGF-IR contributes to brain development by supporting neural growth, survival, and differentiation, we sought to determine the molecular mechanism(s) involved in ethanol's effects on this membrane-associated tyrosine kinase. Using multiple neuronal cell types, we performed Western blot, immunoprecipitation, and GST-pulldowns following acute (1-24 h) or chronic (3 weeks) treatment with ethanol. Surprisingly, exposure of multiple neuronal cell types to acute (up to 24 h) ethanol (50 mM) enhanced IGF-I-induced phosphorylation of extracellular regulated kinases (ERKs), without affecting IGF-IR tyrosine phosphorylation itself, or Akt phosphorylation. This acute increase in ERKs phosphorylation was followed by the expected inhibition of the IGF-IR signaling following 3-week ethanol exposure. We then expressed a GFP-tagged IGF-IR construct in PC12 cells and used them to perform fluorescence recovery after photobleaching (FRAP) analysis. Using these fluorescently labeled cells, we determined that 50 mM ethanol decreased the half-time of the IGF-IR-associated FRAP, which implied that cell membrane-associated signaling events could be affected. Indeed, co-immunoprecipitation and GST-pulldown studies demonstrated that the acute ethanol exposure increased the recruitment of p52-Shc to the Grb2-Shc complex, which is known to engage the Ras-Raf-ERKs pathway following IGF-1 stimulation. These experiments indicate that even a short and low-dose exposure to ethanol may dysregulate function of the receptor, which plays a critical role in brain development. J. Cell. Physiol. 232: 1275-1286, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Matthew Dean
- Alcohol and Drug Abuse Center of Excellence, Department of Physiology, LSU Health New Orleans, New Orleans, LA, 70112
- Department of Genetics, LSU Health New Orleans
- Stanley S. Scott Cancer Center, LSU Health New Orleans
| | - Adam Lassak
- Stanley S. Scott Cancer Center, LSU Health New Orleans
| | - Anna Wilk
- University of South Alabama Mitchell Cancer Institute, Mobile, AL, 36604
| | | | - Luis Marrero
- Morphology and Imaging Core, LSU Health New Orleans
| | - Patricia Molina
- Alcohol and Drug Abuse Center of Excellence, Department of Physiology, LSU Health New Orleans, New Orleans, LA, 70112
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Dos Anjos DO, Sobral Alves ES, Gonçalves VT, Fontes SS, Nogueira ML, Suarez-Fontes AM, Neves da Costa JB, Rios-Santos F, Vannier-Santos MA. Effects of a novel β-lapachone derivative on Trypanosoma cruzi: Parasite death involving apoptosis, autophagy and necrosis. Int J Parasitol Drugs Drug Resist 2016; 6:207-219. [PMID: 27770751 PMCID: PMC5078628 DOI: 10.1016/j.ijpddr.2016.10.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 10/07/2016] [Accepted: 10/10/2016] [Indexed: 12/18/2022]
Abstract
Natural products comprise valuable sources for new antiparasitic drugs. Here we tested the effects of a novel β-lapachone derivative on Trypanosoma cruzi parasite survival and proliferation and used microscopy and cytometry techniques to approach the mechanism(s) underlying parasite death. The selectivity index determination indicate that the compound trypanocidal activity was over ten-fold more cytotoxic to epimastigotes than to macrophages or splenocytes. Scanning electron microscopy analysis revealed that the R72 β-lapachone derivative affected the T. cruzi morphology and surface topography. General plasma membrane waving and blebbing particularly on the cytostome region were observed in the R72-treated parasites. Transmission electron microscopy observations confirmed the surface damage at the cytostome opening vicinity. We also observed ultrastructural evidence of the autophagic mechanism termed macroautophagy. Some of the autophagosomes involved large portions of the parasite cytoplasm and their fusion/confluence may lead to necrotic parasite death. The remarkably enhanced frequency of autophagy triggering was confirmed by quantitating monodansylcadaverine labeling. Some cells displayed evidence of chromatin pycnosis and nuclear fragmentation were detected. This latter phenomenon was also indicated by DAPI staining of R72-treated cells. The apoptotis induction was suggested to take place in circa one-third of the parasites assessed by annexin V labeling measured by flow cytometry. TUNEL staining corroborated the apoptosis induction. Propidium iodide labeling indicate that at least 10% of the R72-treated parasites suffered necrosis within 24 h. The present data indicate that the β-lapachone derivative R72 selectively triggers T. cruzi cell death, involving both apoptosis and autophagy-induced necrosis.
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Affiliation(s)
- Danielle Oliveira Dos Anjos
- Lab. Biologia Parasitária, Instituto Gonçalo Moniz, Fundação Oswaldo Cruz - FIOCRUZ, Brazil; Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz UESC, Brazil
| | | | | | - Sheila Suarez Fontes
- Lab. Biologia Parasitária, Instituto Gonçalo Moniz, Fundação Oswaldo Cruz - FIOCRUZ, Brazil
| | - Mateus Lima Nogueira
- Lab. Biologia Parasitária, Instituto Gonçalo Moniz, Fundação Oswaldo Cruz - FIOCRUZ, Brazil
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11
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Podechard N, Chevanne M, Fernier M, Tête A, Collin A, Cassio D, Kah O, Lagadic-Gossmann D, Sergent O. Zebrafish larva as a reliable model for in vivo assessment of membrane remodeling involvement in the hepatotoxicity of chemical agents. J Appl Toxicol 2016; 37:732-746. [PMID: 27896850 DOI: 10.1002/jat.3421] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 10/20/2016] [Accepted: 10/28/2016] [Indexed: 12/13/2022]
Abstract
The easy-to-use in vivo model, zebrafish larva, is being increasingly used to screen chemical-induced hepatotoxicity, with a good predictivity for various mechanisms of liver injury. However, nothing is known about its applicability in exploring the mechanism called membrane remodeling, depicted as changes in membrane fluidity or lipid raft properties. The aim of this study was, therefore, to substantiate the zebrafish larva as a suitable in vivo model in this context. Ethanol was chosen as a prototype toxicant because it is largely described, both in hepatocyte cultures and in rodents, as capable of inducing a membrane remodeling leading to hepatocyte death and liver injury. The zebrafish larva model was demonstrated to be fully relevant as membrane remodeling was maintained even after a 1-week exposure without any adaptation as usually reported in rodents and hepatocyte cultures. It was also proven to exhibit a high sensitivity as it discriminated various levels of cytotoxicity depending on the extent of changes in membrane remodeling. In this context, its sensitivity appeared higher than that of WIF-B9 hepatic cells, which is suited for analyzing this kind of hepatotoxicity. Finally, the protection afforded by a membrane stabilizer, ursodeoxycholic acid (UDCA), or by a lipid raft disrupter, pravastatin, definitely validated zebrafish larva as a reliable model to quickly assess membrane remodeling involvement in chemical-induced hepatotoxicity. In conclusion, this model, compatible with a high throughput screening, might be adapted to seek hepatotoxicants via membrane remodeling, and also drugs targeting membrane features to propose new preventive or therapeutic strategies in chemical-induced liver diseases. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Normand Podechard
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, bâtiment 5, 35043, Rennes Cédex, France.,Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France
| | - Martine Chevanne
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, bâtiment 5, 35043, Rennes Cédex, France.,Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France
| | - Morgane Fernier
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, bâtiment 5, 35043, Rennes Cédex, France.,Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France
| | - Arnaud Tête
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, bâtiment 5, 35043, Rennes Cédex, France.,Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France
| | - Aurore Collin
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, bâtiment 5, 35043, Rennes Cédex, France.,Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France
| | - Doris Cassio
- Inserm, UMR-S 757; Orsay, France; Université Paris-Sud, Orsay, France
| | - Olivier Kah
- Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France.,UMR Inserm 1085, IRSET, Université de Rennes 1, bâtiment 9, 35000, Rennes, France
| | - Dominique Lagadic-Gossmann
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, bâtiment 5, 35043, Rennes Cédex, France.,Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France
| | - Odile Sergent
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, bâtiment 5, 35043, Rennes Cédex, France.,Biosit UMS3480, Université de Rennes 1, 35043, Rennes Cédex, France
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12
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Roux A, Jackson SN, Muller L, Barbacci D, O’Rourke J, Thanos PK, Volkow ND, Balaban C, Schultz JA, Woods AS. Ethanol Induced Brain Lipid Changes in Mice Assessed by Mass Spectrometry. ACS Chem Neurosci 2016; 7:1148-56. [PMID: 27269520 DOI: 10.1021/acschemneuro.6b00120] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Alcohol abuse is a chronic disease characterized by the consumption of alcohol at a level that interferes with physical and mental health and causes serious and persistent changes in the brain. Lipid metabolism is of particular interest due to its high concentration in the brain. Lipids are the main component of cell membranes, are involved in cell signaling, signal transduction, and energy storage. In this study, we analyzed lipid composition of chronically ethanol exposed mouse brains. Juvenile (JUV) and adult (ADU) mice were placed on a daily limited-access ethanol intake model for 52 days. After euthanasia, brains were harvested, and total lipids were extracted from brain homogenates. Samples were analyzed using high resolution mass spectrometry and processed by multivariate and univariate statistical analysis. Significant lipid changes were observed in different classes including sphingolipids, fatty acids, lysophosphatidylcholines, and other glycerophospholipids.
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Affiliation(s)
- Aurelie Roux
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
| | - Shelley N. Jackson
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
| | - Ludovic Muller
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | | | - Joseph O’Rourke
- Behavioral
Neuropharmacology and Neuroimaging Lab, Department of Psychology, University of Buffalo, Buffalo, New York 14260, United States
| | - Panayotis K. Thanos
- Behavioral
Neuropharmacology and Neuroimaging Lab, Department of Psychology, University of Buffalo, Buffalo, New York 14260, United States
| | - Nora D. Volkow
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
| | - Carey Balaban
- Departments of Otolaryngology, Neurobiology, Communication Sciences & Disorders, and Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | | | - Amina S. Woods
- Structural
Biology Unit, NIDA IRP, NIH, Baltimore, Maryland 21224, United States
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13
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Meireles P, Sales-Dias J, Andrade CM, Mello-Vieira J, Mancio-Silva L, Simas JP, Staines HM, Prudêncio M. GLUT1-mediated glucose uptake plays a crucial role during Plasmodium hepatic infection. Cell Microbiol 2016; 19. [PMID: 27404888 PMCID: PMC5297879 DOI: 10.1111/cmi.12646] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 06/20/2016] [Accepted: 07/06/2016] [Indexed: 02/06/2023]
Abstract
Intracellular pathogens have evolved mechanisms to ensure their survival and development inside their host cells. Here, we show that glucose is a pivotal modulator of hepatic infection by the rodent malaria parasite Plasmodium berghei and that glucose uptake via the GLUT1 transporter is specifically enhanced in P. berghei‐infected cells. We further show that ATP levels of cells containing developing parasites are decreased, which is known to enhance membrane GLUT1 activity. In addition, GLUT1 molecules are translocated to the membrane of the hepatic cell, increasing glucose uptake at later stages of infection. Chemical inhibition of GLUT1 activity leads to a decrease in glucose uptake and the consequent impairment of hepatic infection, both in vitro and in vivo. Our results reveal that changes in GLUT1 conformation and cellular localization seem to be part of an adaptive host response to maintain adequate cellular nutrition and energy levels, ensuring host cell survival and supporting P. berghei hepatic development.
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Affiliation(s)
- Patrícia Meireles
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - Joana Sales-Dias
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - Carolina M Andrade
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - João Mello-Vieira
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - Liliana Mancio-Silva
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - J Pedro Simas
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - Henry M Staines
- Institute for Infection & Immunity, St. George's, University of London, Cranmer Terrace, London, UK
| | - Miguel Prudêncio
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
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Andocs G, Rehman MU, Zhao QL, Tabuchi Y, Kanamori M, Kondo T. Comparison of biological effects of modulated electro-hyperthermia and conventional heat treatment in human lymphoma U937 cells. Cell Death Discov 2016; 2:16039. [PMID: 27551529 PMCID: PMC4979466 DOI: 10.1038/cddiscovery.2016.39] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 04/28/2016] [Accepted: 05/01/2016] [Indexed: 11/10/2022] Open
Abstract
Loco-regional hyperthermia treatment has long history in oncology. Modulated electro-hyperthermia (mEHT, trade name: oncothermia) is an emerging curative treatment method in this field due to its highly selective actions. The impedance-matched, capacitive-coupled modulated radiofrequency (RF) current is selectively focused in the malignant cell membrane of the cancer cells. Our objective is studying the cell-death process and comparing the cellular effects of conventional water-bath hyperthermia treatment to mEHT. The U937 human histiocytic lymphoma cell line was used for the experiments. In the case of conventional hyperthermia treatment, cells were immersed in a thermoregulated water bath, whereas in the case of mEHT, the cells were treated using a special RF generator (LabEHY, Oncotherm) and an applicator. The heating dynamics, the maximum temperature reached (42 °C) and the treatment duration (30 min) were exactly the same in both cases. Cell samples were analysed using different flow cytometric methods as well as microarray gene expression assay and western blot analysis was also used to reveal the molecular basis of the induced effects. Definite difference was observed in the biological response to different heat treatments. At 42 °C, only mEHT induced significant apoptotic cell death. The GeneChip analysis revealed a whole cluster of genes, which are highly up-regulated in case of only RF heating, but not in conventional heating. The Fas, c-Jun N-terminal kinases (JNK) and ERK signalling pathway was the dominant factor to induce apoptotic cell death in mEHT, whereas the cell-protective mechanisms dominated in case of conventional heating. This study has clearly shown that conventional hyperthermia and RF mEHT can result in different biological responses at the same temperature. The reason for the difference is the distinct, non-homogenous energy distribution on the cell membrane, which activates cell death-related signalling pathways in mEHT treatment but not in conventional heat treatment.
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Affiliation(s)
- G Andocs
- Department of Radiological Sciences, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama , Toyama, Japan
| | - M U Rehman
- Department of Radiological Sciences, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama , Toyama, Japan
| | - Q-L Zhao
- Department of Radiological Sciences, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama , Toyama, Japan
| | - Y Tabuchi
- Division of Molecular Genetics, Life Science Research Center, University of Toyama , Toyama, Japan
| | - M Kanamori
- Department of Human Science, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama , Toyama, Japan
| | - T Kondo
- Department of Radiological Sciences, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama , Toyama, Japan
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15
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Oxidative Stress in the Healthy and Wounded Hepatocyte: A Cellular Organelles Perspective. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2016:8327410. [PMID: 26788252 PMCID: PMC4691634 DOI: 10.1155/2016/8327410] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Accepted: 09/10/2015] [Indexed: 02/06/2023]
Abstract
Accurate control of the cell redox state is mandatory for maintaining the structural integrity and physiological functions. This control is achieved both by a fine-tuned balance between prooxidant and anti-oxidant molecules and by spatial and temporal confinement of the oxidative species. The diverse cellular compartments each, although structurally and functionally related, actively maintain their own redox balance, which is necessary to fulfill specialized tasks. Many fundamental cellular processes such as insulin signaling, cell proliferation and differentiation and cell migration and adhesion, rely on localized changes in the redox state of signal transducers, which is mainly mediated by hydrogen peroxide (H2O2). Therefore, oxidative stress can also occur long before direct structural damage to cellular components, by disruption of the redox circuits that regulate the cellular organelles homeostasis. The hepatocyte is a systemic hub integrating the whole body metabolic demand, iron homeostasis and detoxification processes, all of which are redox-regulated processes. Imbalance of the hepatocyte's organelles redox homeostasis underlies virtually any liver disease and is a field of intense research activity. This review recapitulates the evolving concept of oxidative stress in the diverse cellular compartments, highlighting the principle mechanisms of oxidative stress occurring in the healthy and wounded hepatocyte.
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16
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Draberova L, Paulenda T, Halova I, Potuckova L, Bugajev V, Bambouskova M, Tumova M, Draber P. Ethanol Inhibits High-Affinity Immunoglobulin E Receptor (FcεRI) Signaling in Mast Cells by Suppressing the Function of FcεRI-Cholesterol Signalosome. PLoS One 2015; 10:e0144596. [PMID: 26658290 PMCID: PMC4686000 DOI: 10.1371/journal.pone.0144596] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Accepted: 11/21/2015] [Indexed: 12/12/2022] Open
Abstract
Ethanol has multiple effects on biochemical events in a variety of cell types, including the high-affinity immunoglobulin E receptor (FcεRI) signaling in antigen-activated mast cells. However, the underlying molecular mechanism remains unknown. To get better understanding of the effect of ethanol on FcεRI-mediated signaling we examined the effect of short-term treatment with non-toxic concentrations of ethanol on FcεRI signaling events in mouse bone marrow-derived mast cells. We found that 15 min exposure to ethanol inhibited antigen-induced degranulation, calcium mobilization, expression of proinflammatory cytokine genes (tumor necrosis factor-α, interleukin-6, and interleukin-13), and formation of reactive oxygen species in a dose-dependent manner. Removal of cellular cholesterol with methyl-β-cyclodextrin had a similar effect and potentiated some of the inhibitory effects of ethanol. In contrast, exposure of the cells to cholesterol-saturated methyl-β-cyclodextrin abolished in part the inhibitory effect of ethanol on calcium response and production of reactive oxygen species, supporting lipid-centric theories of ethanol action on the earliest stages of mast cell signaling. Further studies showed that exposure to ethanol and/or removal of cholesterol inhibited early FcεRI activation events, including tyrosine phosphorylation of the FcεRI β and γ subunits, SYK kinases, LAT adaptor protein, phospholipase Cγ, STAT5, and AKT and internalization of aggregated FcεRI. Interestingly, ethanol alone, and particularly in combination with methyl-β-cyclodextrin, enhanced phosphorylation of negative regulatory tyrosine 507 of LYN kinase. Finally, we found that ethanol reduced passive cutaneous anaphylactic reaction in mice, suggesting that ethanol also inhibits FcεRI signaling under in vivo conditions. The combined data indicate that ethanol interferes with early antigen-induced signaling events in mast cells by suppressing the function of FcεRI-cholesterol signalosomes at the plasma membrane.
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Affiliation(s)
- Lubica Draberova
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
- * E-mail: (LD); (PD)
| | - Tomas Paulenda
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Ivana Halova
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Lucie Potuckova
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Viktor Bugajev
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Monika Bambouskova
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Magda Tumova
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Petr Draber
- Laboratory of Signal Transduction, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
- * E-mail: (LD); (PD)
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Kalkhof S, Dautel F, Loguercio S, Baumann S, Trump S, Jungnickel H, Otto W, Rudzok S, Potratz S, Luch A, Lehmann I, Beyer A, von Bergen M. Pathway and time-resolved benzo[a]pyrene toxicity on Hepa1c1c7 cells at toxic and subtoxic exposure. J Proteome Res 2014; 14:164-82. [PMID: 25362887 DOI: 10.1021/pr500957t] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Benzo[a]pyrene (B[a]P) is an environmental contaminant mainly studied for its toxic/carcinogenic effects. For a comprehensive and pathway orientated mechanistic understanding of the effects directly triggered by a toxic (5 μM) or a subtoxic (50 nM) concentration of B[a]P or indirectly by its metabolites, we conducted time series experiments for up to 24 h to study the effects in murine hepatocytes. These cells rapidly take up and actively metabolize B[a]P, which was followed by quantitative analysis of the concentration of intracellular B[a]P and seven representative degradation products. Exposure with 5 μM B[a]P led to a maximal intracellular concentration of 1604 pmol/5 × 10(4) cells, leveling at 55 pmol/5 × 10(4) cells by the end of the time course. Changes in the global proteome (>1000 protein profiles) and metabolome (163 metabolites) were assessed in combination with B[a]P degradation. Abundance profiles of 236 (both concentrations), 190 (only 5 μM), and 150 (only 50 nM) proteins were found to be regulated in response to B[a]P in a time-dependent manner. At the endogenous metabolite level amino acids, acylcarnitines and glycerophospholipids were particularly affected by B[a]P. The comprehensive chemical, proteome and metabolomic data enabled the identification of effects on the pathway level in a time-resolved manner. So in addition to known alterations, also protein synthesis, lipid metabolism, and membrane dysfunction were identified as B[a]P specific effects.
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Affiliation(s)
- Stefan Kalkhof
- Department of Proteomics, UFZ, Helmholtz-Centre for Environmental Research , Permoserstr. 15, 04318 Leipzig, Germany
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18
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Collin A, Hardonnière K, Chevanne M, Vuillemin J, Podechard N, Burel A, Dimanche-Boitrel MT, Lagadic-Gossmann D, Sergent O. Cooperative interaction of benzo[a]pyrene and ethanol on plasma membrane remodeling is responsible for enhanced oxidative stress and cell death in primary rat hepatocytes. Free Radic Biol Med 2014; 72:11-22. [PMID: 24681337 DOI: 10.1016/j.freeradbiomed.2014.03.029] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 03/14/2014] [Accepted: 03/19/2014] [Indexed: 10/25/2022]
Abstract
Several epidemiologic studies have shown an interactive effect of heavy smoking and heavy alcohol drinking on the development of hepatocellular carcinoma. It has also been recently described that chronic hepatocyte death can trigger excessive compensatory proliferation resulting later in the formation of tumors in mouse liver. As we previously demonstrated that both benzo[a]pyrene (B[a]P), an environmental agent found in cigarette smoke, and ethanol possess similar targets, especially oxidative stress, to trigger death of liver cells, we decided to study here the cellular and molecular mechanisms of the effects of B[a]P/ethanol coexposure on cell death. After an 18-h incubation with 100nM B[a]P, primary rat hepatocytes were supplemented with 50mM ethanol for 5 or 8h. B[a]P/ethanol coexposure led to a greater apoptotic cell death that could be linked to an increase in lipid peroxidation. Plasma membrane remodeling, as depicted by membrane fluidity elevation and physicochemical alterations in lipid rafts, appeared to play a key role, because both toxicants acted with specific complementary effects. Membrane remodeling was shown to induce an accumulation of lysosomes leading to an important increase in low-molecular-weight iron cellular content. Finally, ethanol metabolism, but not that of B[a]P, by providing reactive oxygen species, induced the ultimate toxic process. Indeed, in lysosomes, ethanol promoted the Fenton reaction, lipid peroxidation, and membrane permeabilization, thereby triggering cell death. To conclude, B[a]P exposure, by depleting hepatocyte membrane cholesterol content, would constitute a favorable ground for a later toxic insult such as ethanol intoxication. Membrane stabilization of both plasma membrane and lysosomes might be a potential target for further investigation considering cytoprotective strategies.
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Affiliation(s)
- Aurore Collin
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France
| | - Kevin Hardonnière
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France
| | - Martine Chevanne
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France
| | - Julie Vuillemin
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France
| | - Normand Podechard
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France
| | - Agnès Burel
- Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France
| | - Marie-Thérèse Dimanche-Boitrel
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France
| | - Dominique Lagadic-Gossmann
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France.
| | - Odile Sergent
- UMR INSERM 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, and 35043 Rennes Cédex, France; Biosit UMS3080, Université de Rennes 1, 35043 Rennes Cédex, France.
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19
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Nanoscale effects of ethanol and naltrexone on protein organization in the plasma membrane studied by photoactivated localization microscopy (PALM). PLoS One 2014; 9:e87225. [PMID: 24503624 PMCID: PMC3913589 DOI: 10.1371/journal.pone.0087225] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Accepted: 12/20/2013] [Indexed: 12/04/2022] Open
Abstract
Background Ethanol affects the signaling of several important neurotransmitter and neuromodulator systems in the CNS. It has been recently proposed that ethanol alters the dynamic lateral organization of proteins and lipids in the plasma membrane, thereby affecting surface receptor-mediated cellular signaling. Our aims are to establish whether pharmacologically relevant levels of ethanol can affect the lateral organization of plasma membrane and cytoskeletal proteins at the nanoscopic level, and investigate the relevance of such perturbations for mu-opioid receptor (MOP) function. Methodology/Principal Findings We used Photoactivated Localization Microscopy with pair-correlation analysis (pcPALM), a quantitative fluorescence imaging technique with high spatial resolution (15–25 nm) and single-molecule sensitivity, to study ethanol effects on protein organization in the plasma membrane. We observed that short (20 min) exposure to 20 and 40 mM ethanol alters protein organization in the plasma membrane of cells that harbor endogenous MOPs, causing a rearrangement of the lipid raft marker glycosylphosphatidylinositol (GPI). These effects could be largely occluded by pretreating the cells with the MOP antagonist naltrexone (200 nM for 3 hours). In addition, ethanol induced pronounced actin polymerization, leading to its partial co-localization with GPI. Conclusions/Significance Pharmacologically relevant levels of ethanol alter the lateral organization of GPI-linked proteins and induce actin cytoskeleton reorganization. Pretreatment with the MOP antagonist naltrexone is protective against ethanol action and significantly reduces the extent to which ethanol remodels the lateral organization of lipid-rafts-associated proteins in the plasma membrane. Super-resolution pcPALM reveals details of ethanol action at the nanoscale level, giving new mechanistic insight on the cellular and molecular mechanisms of its action.
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Sergent O, Podechard N, Aliche-Djoudi F, Lagadic-Gossmann D. Acides gras polyinsaturés oméga 3 et toxicité hépatique de l’éthanol : rôle du remodelage membranaire. NUTR CLIN METAB 2014. [DOI: 10.1016/j.nupar.2013.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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21
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Dendelé B, Tekpli X, Hardonnière K, Holme JA, Debure L, Catheline D, Arlt VM, Nagy E, Phillips DH, Ovrebø S, Mollerup S, Poët M, Chevanne M, Rioux V, Dimanche-Boitrel MT, Sergent O, Lagadic-Gossmann D. Protective action of n-3 fatty acids on benzo[a]pyrene-induced apoptosis through the plasma membrane remodeling-dependent NHE1 pathway. Chem Biol Interact 2014; 207:41-51. [PMID: 24246761 DOI: 10.1016/j.cbi.2013.11.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 10/10/2013] [Accepted: 11/03/2013] [Indexed: 11/26/2022]
Abstract
Plasma membrane is an early target of polycyclic aromatic hydrocarbons (PAH). We previously showed that the PAH prototype, benzo[a]pyrene (B[a]P), triggers apoptosis via DNA damage-induced p53 activation (genotoxic pathway) and via remodeling of the membrane cholesterol-rich microdomains called lipid rafts, leading to changes in pH homeostasis (non-genotoxic pathway). As omega-3 (n-3) fatty acids can affect membrane composition and function or hamper in vivo PAH genotoxicity, we hypothesized that addition of physiologically relevant levels of polyunsaturated n-3 fatty acids (PUFAs) might interfere with B[a]P-induced toxicity. The effects of two major PUFAs, docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), were tested on B[a]P cytotoxicity in the liver epithelial cell line F258. Both PUFAs reduced B[a]P-induced apoptosis. Surprisingly, pre-treatment with DHA increased the formation of reactive B[a]P metabolites, resulting in higher levels of B[a]P-DNA adducts. EPA had no apparent effect on B[a]P metabolism or related DNA damage. EPA and DHA prevented B[a]P-induced apoptotic alkalinization by affecting Na(+)/H(+) exchanger 1 activity. Thus, the inhibitory effects of omega-3 fatty acids on B[a]P-induced apoptosis involve a non-genotoxic pathway associated with plasma membrane remodeling. Our results suggest that dietary omega-3 fatty acids may have marked effects on the biological consequences of PAH exposure.
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Affiliation(s)
- Béatrice Dendelé
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France; Université de Rennes 1, SFR Biosit, Rennes, France
| | | | - Kévin Hardonnière
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France; Université de Rennes 1, SFR Biosit, Rennes, France
| | - Jørn A Holme
- Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| | - Laure Debure
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France; Université de Rennes 1, SFR Biosit, Rennes, France
| | - Daniel Catheline
- Laboratoire de Biochimie, INRA, Agrocampus Rennes, Rennes, France
| | - Volker M Arlt
- Analytical and Environmental Sciences Division, MRC-HPA Centre for Environment & Health, King's College London, London, UK
| | - Eszter Nagy
- Analytical and Environmental Sciences Division, MRC-HPA Centre for Environment & Health, King's College London, London, UK
| | - David H Phillips
- Analytical and Environmental Sciences Division, MRC-HPA Centre for Environment & Health, King's College London, London, UK
| | - Steinar Ovrebø
- Section for Toxicology, Department of Biological and Chemical Working Environment, National Institute of Occupational Health, N-0033 Oslo, Norway
| | - Steen Mollerup
- Section for Toxicology, Department of Biological and Chemical Working Environment, National Institute of Occupational Health, N-0033 Oslo, Norway
| | - Mallory Poët
- Université de Nice Sophia Antipolis, CNRS UMR 6097, Faculté des Sciences, Nice, France
| | - Martine Chevanne
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France; Université de Rennes 1, SFR Biosit, Rennes, France
| | - Vincent Rioux
- Laboratoire de Biochimie, INRA, Agrocampus Rennes, Rennes, France
| | - Marie-Thérèse Dimanche-Boitrel
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France; Université de Rennes 1, SFR Biosit, Rennes, France
| | - Odile Sergent
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France; Université de Rennes 1, SFR Biosit, Rennes, France
| | - Dominique Lagadic-Gossmann
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France; Université de Rennes 1, SFR Biosit, Rennes, France.
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22
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Gerbeau-Pissot P, Der C, Thomas D, Anca IA, Grosjean K, Roche Y, Perrier-Cornet JM, Mongrand S, Simon-Plas F. Modification of plasma membrane organization in tobacco cells elicited by cryptogein. PLANT PHYSIOLOGY 2014; 164:273-86. [PMID: 24235133 PMCID: PMC3875808 DOI: 10.1104/pp.113.225755] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 11/05/2013] [Indexed: 05/07/2023]
Abstract
Lipid mixtures within artificial membranes undergo a separation into liquid-disordered and liquid-ordered phases. However, the existence of this segregation into microscopic liquid-ordered phases has been difficult to prove in living cells, and the precise organization of the plasma membrane into such phases has not been elucidated in plant cells. We developed a multispectral confocal microscopy approach to generate ratiometric images of the plasma membrane surface of Bright Yellow 2 tobacco (Nicotiana tabacum) suspension cells labeled with an environment sensitive fluorescent probe. This allowed the in vivo characterization of the global level of order of this membrane, by which we could demonstrate that an increase in its proportion of ordered phases transiently occurred in the early steps of the signaling triggered by cryptogein and flagellin, two elicitors of plant defense reactions. The use of fluorescence recovery after photobleaching revealed an increase in plasma membrane fluidity induced by cryptogein, but not by flagellin. Moreover, we characterized the spatial distribution of liquid-ordered phases on the membrane of living plant cells and monitored their variations induced by cryptogein elicitation. We analyze these results in the context of plant defense signaling, discuss their meaning within the framework of the "membrane raft" hypothesis, and propose a new mechanism of signaling platform formation in response to elicitor treatment.
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Affiliation(s)
| | - Christophe Der
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
| | - Dominique Thomas
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
| | - Iulia-Andra Anca
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
| | - Kevin Grosjean
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
| | - Yann Roche
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
| | - Jean-Marie Perrier-Cornet
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
| | - Sébastien Mongrand
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
| | - Françoise Simon-Plas
- Université de Bourgogne (P.G.-P., C.D., D.T., K.G.), and Institut National de la Recherche Agronomique (I.-A.A., Y.R., F.S.-P.), Unité Mixte de Recherche 1347 Agroécologie, Equipe de Recherche Labelisée 6300 Centre National de la Recherche Scientifique, BP 86510, F–21000 Dijon, France
- AgroSup Dijon, Laboratoire Procédés Alimentaires et Microbiologiques, F–21000 Dijon, France (J.-M.P.-C.); and
- Centre National de la Recherche Scientifique, Laboratoire de Biogenèse Membranaire, Unité Mixte de Recherche 5200, Université Victor Segalen, Institut National de la Recherche Agronomique Bordeaux Aquitaine, BP 81, F–33883 Villenave d’Ornon, France (S.M.)
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23
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Tetramethylpyrazine induces G0/G1 cell cycle arrest and stimulates mitochondrial-mediated and caspase-dependent apoptosis through modulating ERK/p53 signaling in hepatic stellate cells in vitro. Apoptosis 2013; 18:135-49. [PMID: 23247439 DOI: 10.1007/s10495-012-0791-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Activation of hepatic stellate cells (HSCs) is a pivotal event in the pathogenesis of liver fibrosis. Pharmacological induction of HSC apoptosis could be a promising strategy for fibrosis regression. Natural product tetramethylpyrazine (TMP) exhibits potent antifibrotic activities in vivo. However, the molecular mechanisms remain to be defined. The present study aimed at investigating the anti-proliferative and pro-apoptotic effects of TMP on HSCs and elucidating the underlying mechanisms. Our results demonstrated that TMP had no apparent cytotoxic effects on hepatocytes, but significantly inhibited HSC proliferation and induced cell cycle arrest at the G0/G1 checkpoint. These effects were associated with TMP regulation of cyclin D1, p21, p27 and p53. Furthermore, we found that TMP disrupted mitochondrial functions and led to activation of caspase cascades in HSCs. Mechanistic investigations revealed that TMP selectively blocked the extracellular signal-regulated kinase (ERK) signaling and activated p53, which was required for TMP induction of caspase-dependent mitochondrial apoptosis in HSCs. Autodock simulations predicted that TMP could directly bind to ERK2 with two hydrogen bonds and low energy score, indicating that ERK2 could be a direct target molecule for TMP within HSCs. Moreover, TMP altered expression of some marker proteins relevant to HSC activation. These data collectively revealed that TMP modulation of ERK/p53 signaling led to mitochondrial-mediated and caspase-dependent apoptosis in HSCs in vitro. These studies provided mechanistic insights into the antifibrotic properties of TMP that may be exploited as a potential option for hepatic fibrosis.
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Aliche-Djoudi F, Podechard N, Collin A, Chevanne M, Provost E, Poul M, Le Hégarat L, Catheline D, Legrand P, Dimanche-Boitrel MT, Lagadic-Gossmann D, Sergent O. A role for lipid rafts in the protection afforded by docosahexaenoic acid against ethanol toxicity in primary rat hepatocytes. Food Chem Toxicol 2013; 60:286-96. [PMID: 23907024 DOI: 10.1016/j.fct.2013.07.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 06/24/2013] [Accepted: 07/22/2013] [Indexed: 12/17/2022]
Abstract
Previously, we demonstrated that eicosapentaenoic acid enhanced ethanol-induced oxidative stress and cell death in primary rat hepatocytes via an increase in membrane fluidity and lipid raft clustering. In this context, another n-3 polyunsaturated fatty acid, docosahexaenoic acid (DHA), was tested with a special emphasis on physical and chemical alteration of lipid rafts. Pretreatment of hepatocytes with DHA reduced significantly ethanol-induced oxidative stress and cell death. DHA protection could be related to an alteration of lipid rafts. Indeed, rafts exhibited a marked increase in membrane fluidity and packing defects leading to the exclusion of a raft protein marker, flotillin. Furthermore, DHA strongly inhibited disulfide bridge formation, even in control cells, thus suggesting a disruption of protein-protein interactions inside lipid rafts. This particular spatial organization of lipid rafts due to DHA subsequently prevented the ethanol-induced lipid raft clustering. Such a prevention was then responsible for the inhibition of phospholipase C-γ translocation into rafts, and consequently of both lysosome accumulation and elevation in cellular low-molecular-weight iron content, a prooxidant factor. In total, the present study suggests that DHA supplementation could represent a new preventive approach for patients with alcoholic liver disease based upon modulation of the membrane structures.
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Affiliation(s)
- Fatiha Aliche-Djoudi
- UMR Inserm 1085, IRSET, UFR des Sciences Pharmaceutiques et Biologiques, 2, av Pr Léon Bernard, 35043 Rennes Cédex, France; Université de Rennes 1, Biosit UMS3080, 2, av Pr Léon Bernard, 35043 Rennes Cédex, France.
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25
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Bell-Temin H, Zhang P, Chaput D, King MA, You M, Liu B, Stevens SM. Quantitative Proteomic Characterization of Ethanol-Responsive Pathways in Rat Microglial Cells. J Proteome Res 2013; 12:2067-77. [DOI: 10.1021/pr301038f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Harris Bell-Temin
- Department
of Cell Biology,
Microbiology, and Molecular Biology, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620,
United States
| | | | - Dale Chaput
- Department
of Cell Biology,
Microbiology, and Molecular Biology, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620,
United States
| | - Michael A. King
- Department of Veterans Affairs Medical Center, 1601 SW Archer Road, Gainesville,
Florida 32608, United States
| | - Min You
- Department of Molecular Pharmacology
and Physiology, University of South Florida, 12901 Bruce B. Downs Boulevard, Tampa, Florida 33612, United States
| | | | - Stanley M. Stevens
- Department
of Cell Biology,
Microbiology, and Molecular Biology, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620,
United States
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26
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Tekpli X, Holme JA, Sergent O, Lagadic-Gossmann D. Role for membrane remodeling in cell death: Implication for health and disease. Toxicology 2013; 304:141-57. [DOI: 10.1016/j.tox.2012.12.014] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 11/29/2012] [Accepted: 12/20/2012] [Indexed: 12/31/2022]
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27
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Matharu Z, Enomoto J, Revzin A. Miniature enzyme-based electrodes for detection of hydrogen peroxide release from alcohol-injured hepatocytes. Anal Chem 2012; 85:932-9. [PMID: 23163580 DOI: 10.1021/ac3025619] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Alcohol insult to the liver sets off a complex sequence of inflammatory and fibrogenic responses. There is increasing evidence that hepatocytes play a key role in triggering these responses by producing inflammatory signals such as cytokines and reactive oxygen species (ROS). In the present study, we employed a cell culture/biosensor platform consisting of electrode arrays integrated with microfluidics to monitor extracellular H(2)O(2), one of the major ROS types, produced by primary rat hepatocytes during alcohol injury. The biosensor consisted of hydrogel microstructures with entrapped horseradish peroxidase (HRP) immobilized on an array of miniature gold electrodes. These arrays of sensing electrodes were integrated into microfluidic devices and modified with collagen (I) to promote hepatocyte adhesion. Once seeded into the microfluidic devices, hepatocytes were exposed to 100 mM ethanol and the signal at the working electrode was monitored by cyclic voltammetry (CV) over the course of 4 h. The CV experiments revealed that hepatocytes secreted up to 1.16 μM H(2)O(2) after 3 h of stimulation. Importantly, when hepatocytes were incubated with antioxidants or alcohol dehydrogenase inhibitor prior to alcohol exposure, the H(2)O(2) signal was decreased by ~5-fold. These experiments further confirmed that the biosensor was indeed monitoring oxidative stress generated by the hepatocytes and also pointed to one future use of this technology for screening hepatoprotective effects of antioxidants.
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Affiliation(s)
- Zimple Matharu
- Department of Biomedical Engineering, University of California, Davis, California, USA
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28
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Wani NA, Nada R, Khanduja KL, Kaur J. Decreased activity of folate transporters in lipid rafts resulted in reduced hepatic folate uptake in chronic alcoholism in rats. GENES AND NUTRITION 2012; 8:209-19. [PMID: 22956120 DOI: 10.1007/s12263-012-0318-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 08/17/2012] [Indexed: 11/29/2022]
Abstract
Folic acid is an essential nutrient that is required for one-carbon biosynthetic processes and for methylation of biomolecules. Deficiency of this micronutrient leads to disturbances in normal physiology of cell. Chronic alcoholism is well known to be associated with folate deficiency, which is due in part to folate malabsorption. The present study deals with the regulatory mechanisms of folate uptake in liver during chronic alcoholism. Male Wistar rats were fed 1 g/kg body weight/day ethanol (20 % solution) orally for 3 months, and the molecular mechanisms of folate uptake were studied in liver. The characterization of the folate transport system in liver basolateral membrane (BLM) suggested it to be a carrier mediated and acidic pH dependent, with the major involvement of proton coupled folate transporter and folate binding protein in the uptake. The folate transporters were found to be associated with lipid raft microdomain of liver BLM. Moreover, ethanol ingestion decreased the folate transport by altering the Vmax of folate transport process and downregulated the expression of folate transporters in lipid rafts. The decreased transporter levels were associated with reduced protein and mRNA levels of these transporters in liver. The deranged folate uptake together with reduced folate transporter levels in lipid rafts resulted in reduced folate levels in liver and thereby to its reduced levels in serum of ethanol-fed rats. The chronic ethanol ingestion led to decreased folate uptake in liver, which was associated with the decreased number of transporter molecules in the lipid rafts that can be ascribed to the reduced synthesis of these transporters.
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Affiliation(s)
- Nissar Ahmad Wani
- Department of Biochemistry, Postgraduate Institute of Medical Education and Research, Chandigarh, 160 012, India
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29
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Petit-Paitel A, Ménard B, Guyon A, Béringue V, Nahon JL, Zsürger N, Chabry J. Prion protein is a key determinant of alcohol sensitivity through the modulation of N-methyl-D-aspartate receptor (NMDAR) activity. PLoS One 2012; 7:e34691. [PMID: 22536327 PMCID: PMC3335038 DOI: 10.1371/journal.pone.0034691] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 03/06/2012] [Indexed: 11/21/2022] Open
Abstract
The prion protein (PrP) is absolutely required for the development of prion diseases; nevertheless, its physiological functions in the central nervous system remain elusive. Using a combination of behavioral, electrophysiological and biochemical approaches in transgenic mouse models, we provide strong evidence for a crucial role of PrP in alcohol sensitivity. Indeed, PrP knock out (PrP−/−) mice presented a greater sensitivity to the sedative effects of EtOH compared to wild-type (wt) control mice. Conversely, compared to wt mice, those over-expressing mouse, human or hamster PrP genes presented a relative insensitivity to ethanol-induced sedation. An acute tolerance (i.e. reversion) to ethanol inhibition of N-methyl-D-aspartate (NMDA) receptor-mediated excitatory post-synaptic potentials in hippocampal slices developed slower in PrP−/− mice than in wt mice. We show that PrP is required to induce acute tolerance to ethanol by activating a Src-protein tyrosine kinase-dependent intracellular signaling pathway. In an attempt to decipher the molecular mechanisms underlying PrP-dependent ethanol effect, we looked for changes in lipid raft features in hippocampus of ethanol-treated wt mice compared to PrP−/− mice. Ethanol induced rapid and transient changes of buoyancy of lipid raft-associated proteins in hippocampus of wt but not PrP−/− mice suggesting a possible mechanistic link for PrP-dependent signal transduction. Together, our results reveal a hitherto unknown physiological role of PrP on the regulation of NMDAR activity and highlight its crucial role in synaptic functions.
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Affiliation(s)
- Agnès Petit-Paitel
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Baptiste Ménard
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Alice Guyon
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Vincent Béringue
- Institut National de la Recherche Agronomique, UR892, Virologie et Immunologie Moléculaires, Jouy-en-Josas, France
| | - Jean-Louis Nahon
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Nicole Zsürger
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
| | - Joëlle Chabry
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Valbonne, France
- * E-mail:
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Enniatin B-induced cell death and inflammatory responses in RAW 267.4 murine macrophages. Toxicol Appl Pharmacol 2012; 261:74-87. [PMID: 22483798 DOI: 10.1016/j.taap.2012.03.014] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 03/12/2012] [Accepted: 03/19/2012] [Indexed: 12/11/2022]
Abstract
The mycotoxin enniatin B (EnnB) is predominantly produced by species of the Fusarium genera, and often found in grain. The cytotoxic effect of EnnB has been suggested to be related to its ability to form ionophores in cell membranes. The present study examines the effects of EnnB on cell death, differentiation, proliferation and pro-inflammatory responses in the murine monocyte-macrophage cell line RAW 264.7. Exposure to EnnB for 24 h caused an accumulation of cells in the G0/G1-phase with a corresponding decrease in cyclin D1. This cell cycle-arrest was possibly also linked to the reduced cellular ability to capture and internalize receptors as illustrated by the lipid marker ganglioside GM1. EnnB also increased the number of apoptotic, early apoptotic and necrotic cells, as well as cells with elongated spindle-like morphology. The Neutral Red assay indicated that EnnB induced lysosomal damage; supported by transmission electron microscopy (TEM) showing accumulation of lipids inside the lysosomes forming lamellar structures/myelin bodies. Enhanced levels of activated caspase-1 were observed after EnnB exposure and the caspase-1 specific inhibitor ZYVAD-FMK reduced EnnB-induced apoptosis. Moreover, EnnB increased the release of interleukin-1 beta (IL-1β) in cells primed with lipopolysaccharide (LPS), and this response was reduced by both ZYVAD-FMK and the cathepsin B inhibitor CA-074Me. In conclusion, EnnB was found to induce cell cycle arrest, cell death and inflammation. Caspase-1 appeared to be involved in the apoptosis and release of IL-1β and possibly activation of the inflammasome through lysosomal damage and leakage of cathepsin B.
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31
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Aliche-Djoudi F, Podechard N, Chevanne M, Nourissat P, Catheline D, Legrand P, Dimanche-Boitrel MT, Lagadic-Gossmann D, Sergent O. Physical and chemical modulation of lipid rafts by a dietary n-3 polyunsaturated fatty acid increases ethanol-induced oxidative stress. Free Radic Biol Med 2011; 51:2018-30. [PMID: 21945097 DOI: 10.1016/j.freeradbiomed.2011.08.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 08/25/2011] [Accepted: 08/25/2011] [Indexed: 12/28/2022]
Abstract
Dietary n-3 polyunsaturated fatty acids (n-3 PUFAs) have been reported to modulate lipid raft-dependent signaling, but not yet lipid raft-dependent oxidative stress. Previously, we have shown that ethanol-induced membrane remodeling, i.e., an increase in membrane fluidity and alterations in physical and biochemical properties of lipid rafts, participated in the development of oxidative stress. Thus, we decided to study n-3 PUFA effects in this context, by pretreating hepatocytes with eicosapentaenoic acid (EPA), a long-chain n-3 PUFA, before addition of ethanol. EPA was found to increase ethanol-induced oxidative stress through membrane remodeling. Addition of EPA resulted in a marked increase in lipid raft aggregation compared to ethanol alone. In addition, membrane fluidity of lipid rafts was markedly enhanced. Interestingly, EPA was found to preferentially incorporate into nonraft membrane regions, leading to raft cholesterol increase. Lipid raft aggregation by EPA enhanced phospholipase Cγ translocation into these microdomains. Finally, phospholipase Cγ was shown to participate in the potentiation of oxidative stress by promoting lysosome accumulation, a major source of low-molecular-weight iron. To conclude, the ability of EPA to modify lipid raft physical and chemical properties plays a key role in the enhancement, by this dietary n-3 PUFA, of ethanol-induced oxidative stress.
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Affiliation(s)
- Fatiha Aliche-Djoudi
- EA 4427 SeRAIC/IRSET, IFR 140, UFR des Sciences Pharmaceutiques et Biologiques, Université de Rennes 1, Rennes Cédex, France
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32
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Dolganiuc A. Role of lipid rafts in liver health and disease. World J Gastroenterol 2011; 17:2520-35. [PMID: 21633657 PMCID: PMC3103810 DOI: 10.3748/wjg.v17.i20.2520] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Revised: 02/24/2011] [Accepted: 03/03/2011] [Indexed: 02/06/2023] Open
Abstract
Liver diseases are an increasingly common cause of morbidity and mortality; new approaches for investigation of mechanisms of liver diseases and identification of therapeutic targets are emergent. Lipid rafts (LRs) are specialized domains of cellular membranes that are enriched in saturated lipids; they are small, mobile, and are key components of cellular architecture, protein partition to cellular membranes, and signaling events. LRs have been identified in the membranes of all liver cells, parenchymal and non-parenchymal; more importantly, LRs are active participants in multiple physiological and pathological conditions in individual types of liver cells. This article aims to review experimental-based evidence with regard to LRs in the liver, from the perspective of the liver as a whole organ composed of a multitude of cell types. We have gathered up-to-date information related to the role of LRs in individual types of liver cells, in liver health and diseases, and identified the possibilities of LR-dependent therapeutic targets in liver diseases.
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Sepulveda B, Carcea I, Zhao B, Salton SR, Benson DL. L1 cell adhesion molecule promotes resistance to alcohol-induced silencing of growth cone responses to guidance cues. Neuroscience 2011; 180:30-40. [PMID: 21335065 PMCID: PMC3070798 DOI: 10.1016/j.neuroscience.2011.02.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 01/20/2011] [Accepted: 02/08/2011] [Indexed: 01/05/2023]
Abstract
Alcohol exposure in utero is a common cause of mental retardation, but the targets and mechanisms of action are poorly understood. Several lines of data point toward alterations in cortical connectivity, suggesting that axon guidance may be vulnerable to alcohol exposure. To test this, we asked whether ethanol directly affects cortical axonal growth cone responses to guidance cues. We find that even low concentrations of ethanol (12.5 mM; 57.2 mg/dl) commonly observed in social drinking prevent growth cone responses to three mechanistically independent guidance cues, Semaphorin3A, Lysophosphatidic Acid, and Netrin-1. However, this effect is highly dependent on substrate; axonal growth cones extending on an L1 cell adhesion molecule (L1CAM) substrate retain responsiveness to cues following exposure to ethanol, while those growing on poly-L-lysine or N-cadherin do not. The effects of ethanol on axon extension are, by contrast, quite modest. Quantitative assessments of the effects of ethanol on the surface distribution of L1CAM in growth cones suggest that L1CAM homophilic interactions may be particularly relevant for retaining growth cone responsiveness following ethanol exposure. Together, our findings indicate that ethanol can directly and generally alter growth cone responses to guidance cues, that a substrate of L1CAM effectively antagonizes this effect, and that cortical axonal growth cone vulnerability to ethanol may be predicted in part based on the environment through which they are extending.
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Affiliation(s)
- Bryan Sepulveda
- Fishberg Department of Neuroscience, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029
| | - Ioana Carcea
- Fishberg Department of Neuroscience, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029
| | - Becky Zhao
- Fishberg Department of Neuroscience, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029
| | - Stephen R.J. Salton
- Fishberg Department of Neuroscience, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029
- Brookdale Department of Geriatrics and Palliative Medicine, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029
| | - Deanna L. Benson
- Fishberg Department of Neuroscience, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029
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Campagnac E, Lounès-Hadj Sahraoui A, Debiane D, Fontaine J, Laruelle F, Garçon G, Verdin A, Durand R, Shirali P, Grandmougin-Ferjani A. Arbuscular mycorrhiza partially protect chicory roots against oxidative stress induced by two fungicides, fenpropimorph and fenhexamid. MYCORRHIZA 2010; 20:167-78. [PMID: 19756779 DOI: 10.1007/s00572-009-0267-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Accepted: 07/13/2009] [Indexed: 05/28/2023]
Abstract
The present work examined the oxidative stress induced by different concentrations (0.02 and 0.2 mg l-1) of two sterol biosynthesis inhibitor fungicides (fenpropimorph and fenhexamid) in non-target chicory root colonised or not by Glomus intraradices in a monoxenic system. The fungicides were found to cause oxidative damage by increasing lipid peroxidation measured by malondialdehyde production in non-colonised roots. Detoxification of the H(2)O(2) product was measured at 0.2 mg l-1 of fenpropimorph by an increase in peroxidase activities suggesting an antioxidant capacity in these roots. Moreover, this study pointed out the ability of arbuscular mycorrhiza to alleviate partially the oxidative stress in chicory roots, probably by lowering reactive oxygen species concentrations, resulting from increases in antioxidant defences. Our results suggest that the enhanced fungicide tolerance in the AM symbiosis could be related to less cell membrane damage.
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Tekpli X, Rissel M, Huc L, Catheline D, Sergent O, Rioux V, Legrand P, Holme JA, Dimanche-Boitrel MT, Lagadic-Gossmann D. Membrane remodeling, an early event in benzo[a]pyrene-induced apoptosis. Toxicol Appl Pharmacol 2009; 243:68-76. [PMID: 19931295 DOI: 10.1016/j.taap.2009.11.014] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 11/01/2009] [Accepted: 11/10/2009] [Indexed: 11/24/2022]
Abstract
Benzo[alpha]pyrene (B[alpha]P) often serves as a model for mutagenic and carcinogenic polycyclic aromatic hydrocarbons (PAHs). Our previous work suggested a role of membrane fluidity in B[alpha]P-induced apoptotic process. In this study, we report that B[alpha]P modifies the composition of cholesterol-rich microdomains (lipid rafts) in rat liver F258 epithelial cells. The cellular distribution of the ganglioside-GM1 was markedly changed following B[alpha]P exposure. B[alpha]P also modified fatty acid composition and decreased the cholesterol content of cholesterol-rich microdomains. B[alpha]P-induced depletion of cholesterol in lipid rafts was linked to a reduced expression of 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoA reductase). Aryl hydrocarbon receptor (AhR) and B[alpha]P-related H(2)O(2) formation were involved in the reduced expression of HMG-CoA reductase and in the remodeling of membrane microdomains. The B[alpha]P-induced membrane remodeling resulted in an intracellular alkalinization observed during the early phase of apoptosis. In conclusion, B[alpha]P altered the composition of plasma membrane microstructures through AhR and H(2)O(2) dependent-regulation of lipid biosynthesis. In F258 cells, the B[alpha]P-induced membrane remodeling was identified as an early apoptotic event leading to an intracellular alkalinization.
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Affiliation(s)
- Xavier Tekpli
- EA 4427 SeRAIC, Equipe labellisée Ligue contre le Cancer, Université de Rennes 1, IFR 140, 35043 Rennes cédex, France
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CD95 engagement mediates actin-independent and -dependent apoptotic signals. Cell Death Differ 2009; 16:1654-64. [DOI: 10.1038/cdd.2009.111] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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Lu CY, Li CC, Liu KL, Lii CK, Chen HW. Docosahexaenoic acid downregulates phenobarbital-induced cytochrome P450 2B1 gene expression in rat primary hepatocytes via the c-Jun NH2-terminal kinase mitogen-activated protein kinase pathway. Mol Nutr Food Res 2009; 53:341-8. [PMID: 18803253 DOI: 10.1002/mnfr.200800112] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Mitogen-activated protein kinase (MAPK) pathways play central roles in the transduction of extracellular stimuli into cells and the regulation of expression of numerous genes. Docosahexaenoic acid (DHA) was shown to be involved in the regulation of expression of drug metabolizing enzymes (DMEs) in rat primary hepatocytes in response to xenobiotics. Cytochrome P450 2B1 (CYP 2B1) is a DME that is dramatically induced by phenobarbital-type inducers. The constitutive androstane receptor (CAR) plays a critical role in regulating the expression of DMEs, and the phosphorylation/dephosphorylation of CAR is an important event in CYP 2B1 expression. In the present study, we determined the effect of DHA on MAPK transactivation and its role in CYP 2B1 expression induced by phenobarbital. c-Jun NH2-terminal kinase (JNK) JNK1/2 and ERK1/2 were activated by phenobarbital in a dose-dependent manner. DHA (100 muM) inhibited JNK1/2 and ERK2 activation induced by phenobarbital in a time-dependent manner. Both SP600125 (a JNK inhibitor) and SB203580 (a p38 MAPK inhibitor) inhibited CYP 2B1 protein and mRNA expression induced by phenobarbital. SB203580 significantly increased the intracellular 3'-5'-cyclic adenosine monophosphate (cAMP) concentration compared with a control group (p < 0.05). Our results suggest that inhibition of JNK activation by DHA is at least part of the mechanisms of DHA's downregulation of CYP 2B1 expression induced by phenobarbital.
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Affiliation(s)
- Chia-Yang Lu
- Department of Nutrition, Chung Shan Medical University, Taichung, Taiwan, ROC
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Patel HH, Insel PA. Lipid rafts and caveolae and their role in compartmentation of redox signaling. Antioxid Redox Signal 2009; 11:1357-72. [PMID: 19061440 PMCID: PMC2757136 DOI: 10.1089/ars.2008.2365] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Membrane (lipid) rafts and caveolae, a subset of rafts, are cellular domains that concentrate plasma membrane proteins and lipids involved in the regulation of cell function. In addition to providing signaling platforms for G-protein-coupled receptors and certain tyrosine kinase receptors, rafts/caveolae can influence redox signaling. This review discusses molecular characteristics of and methods to study rafts/caveolae, determinants that contribute to the localization of molecules in these entities, an overview of signaling molecules that show such localization, and the contribution of rafts/caveolae to redox signaling. Of particular note is the evidence that endothelial nitric oxide synthase (eNOS), NADPH oxygenase, and heme oxygenase, along with other less well-studied redox systems, localize in rafts and caveolae. The precise basis for this localization and the contribution of raft/caveolae-localized redox components to physiology and disease are important issues for future studies.
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Affiliation(s)
- Hemal H Patel
- Department of Anesthesiology, University of California, San Diego, La Jolla, California 92093-0636, USA
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Abstract
Alcohol abuse is a global problem due to the financial burden on society and the healthcare system. While the harmful health effects of chronic alcohol abuse are well established, more recent data suggest that acute alcohol consumption also affects human wellbeing. Thus, there is a need for research models in order to fully understand the effect of acute alcohol abuse on different body systems and organs. The present manuscript summarizes the interdisciplinary advantages and disadvantages of currently available human and non-human models of acute alcohol abuse, and identifies their suitability for biomedical research.
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Vukojević V, Ming Y, D'Addario C, Rigler R, Johansson B, Terenius L. Ethanol/naltrexone interactions at the mu-opioid receptor. CLSM/FCS study in live cells. PLoS One 2008; 3:e4008. [PMID: 19104662 PMCID: PMC2602977 DOI: 10.1371/journal.pone.0004008] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Accepted: 11/24/2008] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Alcoholism is a widespread chronic disorder of complex aetiology with a significant negative impact on the individual and the society. Mechanisms of ethanol action are not sufficiently well understood at the molecular level and the pharmacotherapy of alcoholism is still in its infancy. Our study focuses at the cellular and molecular level on ethanol-induced effects that are mediated through the micro-opioid receptor (MOP) and on the effects of naltrexone, a well-known antagonist at MOP that is used clinically to prevent relapse in alcoholism. METHODOLOGY/PRINCIPAL FINDINGS Advanced fluorescence imaging by Confocal Laser Scanning Microscopy (CLSM) and Fluorescence Correlation Spectroscopy (FCS) are used to study ethanol effects on MOP and plasma membrane lipid dynamics in live PC12 cells. We observed that relevant concentrations of ethanol (10-40 mM) alter MOP mobility and surface density, and affect the dynamics of plasma membrane lipids. Compared to the action of specific ligands at MOP, ethanol-induced effects show complex kinetics and point to a biphasic underlying mechanism. Pretreatment with naloxone or naltrexone considerably mitigates the effects of ethanol. CONCLUSIONS/SIGNIFICANCE We suggest that ethanol acts by affecting the sorting of MOP at the plasma membrane of PC12 cells. Naltrexone exerts opposite effects on MOP sorting at the plasma membrane, thereby countering the effects of ethanol. Our experimental findings give new insight on MOP-mediated ethanol action at the cellular and molecular level. We suggest a new hypothesis to explain the well established ethanol-induced increase in the activity of the endogenous opioid system.
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Affiliation(s)
- Vladana Vukojević
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
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