1
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Zhang J, Yang J, Duval C, Edin ML, Williams A, Lei L, Tu M, Pourmand E, Song R, Graves JP, DeGraff LM, Wong JJL, Wang Y, Sun Q, Sanidad KZ, Wong S, Han Y, Zhang Z, Lee KSS, Park Y, Xiao H, Liu Z, Decker EA, Cui W, Zeldin DC, Zhang G. CYP eicosanoid pathway mediates colon cancer-promoting effects of dietary linoleic acid. FASEB J 2023; 37:e23009. [PMID: 37273180 DOI: 10.1096/fj.202300786r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/11/2023] [Accepted: 05/19/2023] [Indexed: 06/06/2023]
Abstract
Human and animal studies support that consuming a high level of linoleic acid (LA, 18:2ω-6), an essential fatty acid and key component of the human diet, increases the risk of colon cancer. However, results from human studies have been inconsistent, making it challenging to establish dietary recommendations for optimal LA intake. Given the importance of LA in the human diet, it is crucial to better understand the molecular mechanisms underlying its potential colon cancer-promoting effects. Using LC-MS/MS-based targeted lipidomics, we find that the cytochrome P450 (CYP) monooxygenase pathway is a major pathway for LA metabolism in vivo. Furthermore, CYP monooxygenase is required for the colon cancer-promoting effects of LA, since the LA-rich diet fails to exacerbate colon cancer in CYP monooxygenase-deficient mice. Finally, CYP monooxygenase mediates the pro-cancer effects of LA by converting LA to epoxy octadecenoic acids (EpOMEs), which have potent effects on promoting colon tumorigenesis via gut microbiota-dependent mechanisms. Overall, these results support that CYP monooxygenase-mediated conversion of LA to EpOMEs plays a crucial role in the health effects of LA, establishing a unique mechanistic link between dietary fatty acid intake and cancer risk. These results could help in developing more effective dietary guidelines for optimal LA intake and identifying subpopulations that may be especially vulnerable to LA's negative effects.
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Affiliation(s)
- Jianan Zhang
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Jun Yang
- Department of Entomology and Comprehensive Cancer Center, University of California, Davis, California, USA
| | - Caroline Duval
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Matthew L Edin
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Andrea Williams
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, Massachusetts, USA
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, Massachusetts, USA
| | - Lei Lei
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Maolin Tu
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Elham Pourmand
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan, USA
| | - Renhua Song
- Epigenetics and RNA Biology Program Centenary Institute, University of Sydney, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Camperdown, New South Wales, Australia
| | - Joan P Graves
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Laura M DeGraff
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Justin J-L Wong
- Epigenetics and RNA Biology Program Centenary Institute, University of Sydney, Camperdown, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, Camperdown, New South Wales, Australia
| | - Yige Wang
- Department of Food Science and Technology, National University of Singapore, Singapore, Singapore
| | - Quancai Sun
- Department of Food Science and Technology, National University of Singapore, Singapore, Singapore
| | - Katherine Z Sanidad
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, Massachusetts, USA
| | - Siu Wong
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, Massachusetts, USA
| | - Yanhui Han
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Zhenyu Zhang
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Kin Sing Stephen Lee
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan, USA
| | - Yeonhwa Park
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Hang Xiao
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Zhenhua Liu
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, Massachusetts, USA
- Nutrition and Cancer Prevention Laboratory, School of Public Health and Health Sciences, University of Massachusetts, Amherst, Massachusetts, USA
| | - Eric A Decker
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
| | - Wei Cui
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, Massachusetts, USA
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, Massachusetts, USA
| | - Darryl C Zeldin
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Guodong Zhang
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts, USA
- Department of Food Science and Technology, National University of Singapore, Singapore, Singapore
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Comte F, Duval C. Should we estimate a product of density functions by a product of estimators? Electron J Stat 2023. [DOI: 10.1214/23-ejs2103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- F. Comte
- Université Paris Cité, CNRS, MAP5 UMR 8145, F-75006 Paris, France
| | - C. Duval
- Université de Lille, CNRS, UMR 8524, Laboratoire Paul Painlevé, F-59000 Lille, France
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Duval C, Sirois C, Savoie-White F, Tardif P, Bérubé M, Turgeon-Fournier A, Cook D, Lauzier F, Moore L. 83 - Compression pneumatique intermittente adjuvante : revue systématique et méta-analyse. Rev Epidemiol Sante Publique 2022. [DOI: 10.1016/j.respe.2022.06.096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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4
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Duval C, Joao F, Calvé A, Montjean D, Bélanger MC, Benkhlaifa M, Miron P. O-020 Sperm phospholipase C zeta levels measured by flow cytometry are associated with sperm parameters. Hum Reprod 2022. [DOI: 10.1093/humrep/deac104.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Study question
Are the levels of phospholipase C zeta (PLCζ) in sperm associated with sperm parameters?
Summary answer
Yes, PLCζ levels are correlated with motility, vitality, concentration and morphology and decreased in samples with anormal sperm parameters.
What is known already
Sperm phospholipase C Zeta (PLCζ) is a protein mainly located in the sperm head and its major role is the induction of the Ca2+ oscillations necessary for oocyte activation following fertilization. During fertilization, PLCζ is released into the ovum cytoplasm and induces Ca2+ oscillations via the inositol 1,4,5-triphosphate signaling pathway. PLCζ deficiency have been shown to be associated with low or total failed fertilization after intracytoplasmic sperm injection. In such cases, artificial oocyte activation (AOA) using calcium ionophore has been shown to increase fertilization rates. Thus, finding easy method to quantify PLCζ in a clinical setting is crucial.
Study design, size, duration
Between May 2021 and September 2021, 92 patients already doing a spermogram gave their inform consent to donate their unused sperm sample to research. They were split into two groups based on the normality of the spermogram (following World Health Organization 2010 criteria), normal sperm parameters (NPS, n = 24) and abnormal sperm parameters (ASP, n = 68). Levels of PLCζ were also determined in a subgroup of patient before and after the passage in a microfluidic chamber (ZyMōt™)(n = 27).
Participants/materials, setting, methods
Age, volume, pH, concentration, total sperm count, motility, progressive motility, vitality, morphology, DNA fragmentation, chromatin compaction, level of PLCζ and fluorescence intensity were compared between the two groups and correlations were made to better understand the association between PLCζ levels and sperm parameters. PLCζ levels were assessed by flow cytometry after fixation and permeabilization of the cells, primary antibody (rabbit anti-human PLCζ) and secondary antibody (goat anti-rabbit coupled with the fluorochrome FITC).
Main results and the role of chance
Significantly lower PLCζ levels were observed in ASP patients compared to NSP patients (respectively 45.4% vs 56.9%, p = 0.0038). Positive correlations were also observed between PLCζ levels and sperm concentration, total sperm count, progressive motility, total motility, and sperm vitality (p<0.001). ROC analysis revealed that a PLCζ levels cut-off of 64.4% could differentiate NSP from ASP patients with 83.8% sensitivity, 54.17% specificity, 54.2% PPV and 83.8% NPV (Area under the curve: 0.6829; p<0.0079). Moreover, higher PLCζ levels were found after sperm migration using a ZyMōt™ device (before 45.96 vs after 60.15, p<0.001). This method development also demonstrated the ability to detect low PLCζ levels in semen samples and those patients will be directed to artificial oocyte activation using a calcium ionophore to increase their chance of success.
Limitations, reasons for caution
Since there is a correlation between PLCζ levels and motility/vitality, it is expected that a sample treatment with a microfluidic chamber will increased the percentage of PLCζ. In addition, PLCζ is implicated in oocyte activation, so the real cut-off point should be determined with in-vitro fertilization (IVF) outcomes.
Wider implications of the findings
Demonstrating the association between PLCζ levels and sperm parameters established the relevance of using a microfluidic chamber for a better sperm quality for IVF or intracytoplasmic sperm injection (ICSI).
Trial registration number
Not applicable
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Affiliation(s)
- C Duval
- Fertilys, Research and Development, Laval , Canada
| | - F Joao
- Fertilys, Research and Development, Laval , Canada
| | - A Calvé
- Fertilys, Research and Development, Laval , Canada
| | - D Montjean
- Fertilys, Research and Development, Laval , Canada
| | - M C Bélanger
- Fertilys, Research and Development, Laval , Canada
| | - M Benkhlaifa
- Fertilys, Research and Development, Laval , Canada
| | - P Miron
- Fertilys, Research and Development, Laval , Canada
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Comte F, Duval C, Sacko O. Optimal Adaptive Estimation on $${\mathbb{R}}$$ or $${\mathbb{R}}^{{+}}$$of the Derivatives of a Density. Math Meth Stat 2021. [DOI: 10.3103/s1066530720010020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Duval C, Hamlaoui S, Piquet B, Toutirais G, Yéprémian C, Reinhardt A, Duperron S, Marie B, Demay J, Bernard C. Diversity of cyanobacteria from thermal muds (Balaruc-Les-Bains, France) with the description of Pseudochroococcus coutei gen. nov., sp. nov. FEMS Microbes 2021. [DOI: 10.1093/femsmc/xtab006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
ABSTRACT
Cyanobacteria are able to synthesize a high diversity of natural compounds that account for their success in the colonization of a variety of ecological niches. Many of them have beneficial properties. The mud from the thermal baths of Balaruc-Les-Bains, one of the oldest thermal baths in France, has long been recognized as a healing treatment for arthro-rheumatic diseases. To characterize the cyanobacteria living in these muds, several strains were isolated from the water column and biofilms of the retention basin and analyzed using a polyphasic approach. Morphological, ultrastructural and molecular (16S rRNA gene and 16S-23S ITS region sequencing) methods were employed to identify nine cyanobacterial strains belonging to the orders Chroococcales, Synechococcales, Oscillatoriales and Nostocales. The combination of morphological and genetic characteristics supported the description of a new genus and species with the type species as Pseudochroococcus coutei. The taxonomic diversity in the muds from Thermes de Balaruc-Les-Bains appears higher than previously documented, providing new candidate taxa for their observed therapeutic properties.
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Affiliation(s)
- C Duval
- UMR7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - S Hamlaoui
- UMR7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - B Piquet
- Electron Microscopy Platform, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - G Toutirais
- Electron Microscopy Platform, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - C Yéprémian
- UMR7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - A Reinhardt
- Thermes de Balaruc-Les-Bains, 1 rue du Mont Saint-Clair BP 45, 34540 Balaruc-Les-Bains, France
| | - S Duperron
- UMR7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - B Marie
- UMR7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - J Demay
- UMR7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - C Bernard
- UMR7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
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7
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Duval C, Anthony N, Thore-Dupont E, Jaubert J, Camuset G, Von Theobald P, Franco JM, Poubeau P, Bruneau L, Bertolotti A. [Prevalence and Risk Factors of Chlamydia Trachomatis Infection Among Women Consulting at the Sexually Transmitted Infection Centre in la Reunion: A Cross-Sectional Study]. Med Trop Sante Int 2021; 1:mtsibulletin.n1.2021.69. [PMID: 35586641 PMCID: PMC9022755 DOI: 10.48327/mtsibulletin.n1.2021.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 02/28/2021] [Indexed: 11/24/2022]
Abstract
Introduction Chlamydia trachomatis (CT) infection is the commonest bacterial sexually transmitted infection (STI) in the world. Often asymptomatic, it can lead to significant complications in women. In France, since 2003, systematic screening for CT in STI center has been recommended for women aged less than 25 year. The main objective of this study was to determine CT prevalence in patients attending STI centers in Reunion Island. The second objective was to explore the determinants of this infection. Method A cross-sectional survey using an anonymous questionnaire was conducted among women attending STI center in two hospitals in western and southern Reunion Island during one year. All women who had performed a CT PCR, based on vaginal self-swabs, were included. Results Among the 620 patients tested, the prevalence of infection was 6.6% (95% CI [4.7-8.6]). By age group, the highest prevalence was between 12 and 17 years with 14.3% positive tests compared to 7.5% and 3.9% respectively in 18-24 and 25-67 year age group (p = 0.003). The risk factors for CT were a young age (p = 0.02), a first sexual intercourse between 11 and 14 years old (p = 0.01), lack of previous STI screening history (p = 0.02), and the following motives for seeking screening: "partner unfaithfulness" (p = 0.01) and "infected partner" (p = 0.02). Conclusion This study highlights the high prevalence of CT among Reunionese minors. A more systematic screening and a reinforcement of STI awareness among young people in Reunion Island seem to be essential.
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Affiliation(s)
- C. Duval
- CHU Réunion, Service des maladies infectieuses - dermatologie, Saint Pierre, La Réunion, France
| | - N. Anthony
- Inserm CIC1410, CHU Réunion, Saint Pierre, La Réunion, France
| | - E. Thore-Dupont
- CHU Réunion, Centre gratuit d'information de dépistage et diagnostic des IST, Saint Paul, La Réunion, France
| | - J. Jaubert
- CHU Réunion, Laboratoire de microbiologie, Saint Pierre, La Réunion, France
| | - G. Camuset
- CHU Réunion, Service des maladies infectieuses - dermatologie, Saint Pierre, La Réunion, France
| | - P. Von Theobald
- CHU Réunion, Service de gynécologie - obstétrique, Saint Denis, La Réunion, France
| | - J.-M. Franco
- Département de médecine générale universitaire, La Réunion, France
| | - P. Poubeau
- CHU Réunion, Service des maladies infectieuses - dermatologie, Saint Pierre, La Réunion, France
| | - L. Bruneau
- Inserm CIC1410, CHU Réunion, Saint Pierre, La Réunion, France
| | - A. Bertolotti
- CHU Réunion, Service des maladies infectieuses - dermatologie, Saint Pierre, La Réunion, France,Inserm CIC1410, CHU Réunion, Saint Pierre, La Réunion, France,*
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8
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Abstract
Abstract
Background/Introduction
Patients with established coronary artery disease have impaired clot structure and lysis. Prior research has compared patients with myocardial infarction to those with stable coronary artery disease (without a healthy reference), or patients after myocardial ischemia. The role of clot structure in the acute phase of the disease is unknown.
Purpose
Investigate clot structure in the acute phase of myocardial infarction (AMI) compared to healthy controls.
Methods
Plasma clots from AMI patients (within 12 hours of symptoms onset) or healthy controls were analyzed by turbidity and lysis. Clot pore size was determined by permeation. Clot ultrastructure was determined by confocal and scanning electron microscopy. Average fiber radius and protofibril packing were investigated by turbidimetry.
Results
Analysis on clot formation, using turbidity, showed increased lag time (24%, p<0.05), suggesting changes in protofibril packing and increased fiber size for AMI patients compared to controls. Additionally, AMI clots formed more quickly as evidenced by average rate of clotting (2.9-fold increase, p<0.001) and time to maximum absorbance (38% decrease, p<0.0001). Decreased plasminogen in AMI patients (23%, p<0.05) had strong effects on clot lysis, including increased time to half lysis (1.72-fold, p<0.0001) and increased time to maximum lysis rate (7.96-fold, p<0.0001). Taken together, these results suggest that AMI patients form less porous clots made from densely packed fibers with decreased numbers of protofibrils, which was confirmed using permeation (1.05-fold decrease, p<0.0001), confocal (Figure 1) and scanning electron microscopy (46% increase, p<0.0001), and turbidimetry (16% decrease, p<0.05) respectively.
Conclusions
Plasma from patients with AMI form denser and less permeable clots that lyse more slowly than healthy controls. These data show marked abnormalities in clot ultrastructure that contribute to the high risk of thrombosis during the acute phase of myocardial infarction, which has not shown in previous investigations.
Figure 1. Confocal microscopy of AMI vs. controls
Funding Acknowledgement
Type of funding source: Public Institution(s). Main funding source(s): Jagiellonian University Medical College to G.G. (N41/DBS/000096) and BHF Programme Grant to S.R.B. and R.A.S.A. (RG/18/11/34036).
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Affiliation(s)
- A Siniarski
- Jagiellonian University Medical College, John Paul II Hospital, Krakow, Poland
| | - S.R Baker
- Wake Forest University, Department of Physics, Winston-Salem, United States of America
| | - C Duval
- University of Leeds, Discovery and Translational Science Department, Institute of Cardiovascular and Metabolic Medicine, Leeds, United Kingdom
| | - G Gajos
- Jagiellonian University Medical College, John Paul II Hospital, Krakow, Poland
| | - J Nessler
- Jagiellonian University Medical College, John Paul II Hospital, Krakow, Poland
| | - R.A.S Ariens
- University of Leeds, Discovery and Translational Science Department, Institute of Cardiovascular and Metabolic Medicine, Leeds, United Kingdom
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Dupont C, Morel A, Martel B, Duval C, Divanon F, Levy C. 284P Interest of a multidisciplinary approach in the initiation of oral therapies in metastatic breast cancer (MBC): Experience of a French comprehensive cancer center. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Supsrisunjai C, Chao-kai H, Michael M, Duval C, Lee J, Yang H, Huang H, Chaikul T, Onoufriadis A, Steiner R, Ariens R, Sarig O, Sprecher E, Eskin-Schwartz M, Samlaska C, Simpson M, Calonje J, Parsons M, McGrath J. 259 Coagulation factor XIII-A subunit missense mutation in the pathobiology of autosomal dominant multiple dermatofibromas. J Invest Dermatol 2020. [DOI: 10.1016/j.jid.2020.03.265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chatelain E, Traclet J, Freymond N, Duval C, Si-Mohamed S, Cottin V. [A special micronodular lung disease]. Rev Mal Respir 2020; 37:280-282. [PMID: 32044194 DOI: 10.1016/j.rmr.2020.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 01/02/2020] [Indexed: 10/25/2022]
Affiliation(s)
- E Chatelain
- UMR 754 Inra, centre national de référence coordonnateur des maladies pulmonaires rares, hôpital Louis-Pradel, hospices civils de Lyon, université de Lyon, université Claude-Bernard Lyon-1, 69677 Lyon France
| | - J Traclet
- UMR 754 Inra, centre national de référence coordonnateur des maladies pulmonaires rares, hôpital Louis-Pradel, hospices civils de Lyon, université de Lyon, université Claude-Bernard Lyon-1, 69677 Lyon France
| | - N Freymond
- Service de pneumologie, hôpital Lyon Sud, Pierre-Bénite, France
| | - C Duval
- Institut de pathologie multi-sites des hospices civils de Lyon, Lyon, France
| | - S Si-Mohamed
- Service d'imagerie thoracique et d'interventionnel, hôpital Louis-Pradel, Lyon, France
| | - V Cottin
- UMR 754 Inra, centre national de référence coordonnateur des maladies pulmonaires rares, hôpital Louis-Pradel, hospices civils de Lyon, université de Lyon, université Claude-Bernard Lyon-1, 69677 Lyon France.
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Graves JP, Bradbury JA, Gruzdev A, Li H, Duval C, Lih FB, Edin ML, Zeldin DC. Expression of Cyp2c/ Cyp2j subfamily members and oxylipin levels during LPS-induced inflammation and resolution in mice. FASEB J 2019; 33:14784-14797. [PMID: 31690125 PMCID: PMC6894073 DOI: 10.1096/fj.201901872r] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 09/30/2019] [Indexed: 01/08/2023]
Abstract
Inflammatory stimuli, such as bacterial LPS, alter the expression of many cytochromes P450. CYP2C and CYP2J subfamily members actively metabolize fatty acids to bioactive eicosanoids, which exhibit potent anti-inflammatory effects. Herein, we examined mRNA levels of the 15 mouse Cyp2c and 7 mouse Cyp2j isoforms in liver, kidney, duodenum, and brain over a 96-h time course of LPS-induced inflammation and resolution. Plasma and liver eicosanoid levels were also measured by liquid chromatography with tandem mass spectrometry. Expression changes in Cyp2c and Cyp2j isoforms were both isoform and tissue specific. Total liver Cyp2c and Cyp2j mRNA content was reduced by 80% 24 h after LPS but recovered to baseline levels by 96 h. Total Cyp2c and Cyp2j mRNA in kidney (-19%) and duodenum (-64%) were reduced 24 h after LPS but recovered above baseline by 72 h. Total Cyp2c and Cyp2j mRNA content in brain was elevated at all time points after LPS dosing. Plasma eicosanoids transiently increased 3-6 h after administration of LPS. In liver, esterified oxylipin levels decreased during acute inflammation and before recovering. The biphasic suppression and recovery of mouse Cyp2c and Cyp2j isoforms and associated changes in eicosanoid levels during LPS-induced inflammation and resolution may have important physiologic consequences.-Graves, J. P., Bradbury, J. A., Gruzdev, A., Li, H., Duval, C., Lih, F. B., Edin, M. L., Zeldin, D. C. Expression of Cyp2c/Cyp2j subfamily members and oxylipin levels during LPS-induced inflammation and resolution in mice.
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Affiliation(s)
- Joan P. Graves
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - J. Alyce Bradbury
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Artiom Gruzdev
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Hong Li
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Caroline Duval
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Fred B. Lih
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Matthew L. Edin
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Darryl C. Zeldin
- Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
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Bernard C, Escalas A, Villeriot N, Agogué H, Hugoni M, Duval C, Carré C, Got P, Sarazin G, Jézéquel D, Leboulanger C, Grossi V, Ader M, Troussellier M. Very Low Phytoplankton Diversity in a Tropical Saline-Alkaline Lake, with Co-dominance of Arthrospira fusiformis (Cyanobacteria) and Picocystis salinarum (Chlorophyta). Microb Ecol 2019; 78:603-617. [PMID: 30729265 PMCID: PMC6744573 DOI: 10.1007/s00248-019-01332-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 01/16/2019] [Indexed: 05/03/2023]
Abstract
Lake Dziani Dzaha (Mayotte Island, Indian Ocean) is a tropical thalassohaline lake which geochemical and biological conditions make it a unique aquatic ecosystem considered as a modern analogue of Precambrian environments. In the present study, we focused on the diversity of phytoplanktonic communities, which produce very high and stable biomass (mean2014-2015 = 652 ± 179 μg chlorophyll a L-1). As predicted by classical community ecology paradigms, and as observed in similar environments, a single species is expected to dominate the phytoplanktonic communities. To test this hypothesis, we sampled water column in the deepest part of the lake (18 m) during rainy and dry seasons for two consecutive years. Phytoplanktonic communities were characterized using a combination of metagenomic, microscopy-based and flow cytometry approaches, and we used statistical modeling to identify the environmental factors determining the abundance of dominant organisms. As hypothesized, the overall diversity of the phytoplanktonic communities was very low (15 OTUs), but we observed a co-dominance of two, and not only one, OTUs, viz., Arthrospira fusiformis (Cyanobacteria) and Picocystis salinarum (Chlorophyta). We observed a decrease in the abundance of these co-dominant taxa along the depth profile and identified the adverse environmental factors driving this decline. The functional traits measured on isolated strains of these two taxa (i.e., size, pigment composition, and concentration) are then compared and discussed to explain their capacity to cope with the extreme environmental conditions encountered in the aphotic, anoxic, and sulfidic layers of the water column of Lake Dziani Dzaha.
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Affiliation(s)
- C Bernard
- UMR 7245 MCAM, Muséum National d'Histoire Naturelle - CNRS, 57 Rue Cuvier, CP 39, 75231, Paris Cedex 05, France.
| | - A Escalas
- UMR 7245 MCAM, Muséum National d'Histoire Naturelle - CNRS, 57 Rue Cuvier, CP 39, 75231, Paris Cedex 05, France
| | - N Villeriot
- UMR 7245 MCAM, Muséum National d'Histoire Naturelle - CNRS, 57 Rue Cuvier, CP 39, 75231, Paris Cedex 05, France
- UMR 9190 MARBEC, CNRS - Université de Montpellier - IRD - IFREMER, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
| | - H Agogué
- UMR 7266 LIENSs, Université de La Rochelle - CNRS, 2 rue Olympe de Gouges, 17000, La Rochelle, France
| | - M Hugoni
- UMR 5557 Ecologie Microbienne, Université Lyon 1 - CNRS - INRA, 69220, Villeurbanne Cedex, France
| | - C Duval
- UMR 7245 MCAM, Muséum National d'Histoire Naturelle - CNRS, 57 Rue Cuvier, CP 39, 75231, Paris Cedex 05, France
| | - C Carré
- UMR 9190 MARBEC, CNRS - Université de Montpellier - IRD - IFREMER, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
| | - P Got
- UMR 9190 MARBEC, CNRS - Université de Montpellier - IRD - IFREMER, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
| | - G Sarazin
- UMR 7154 Institut de Physique du Globe de Paris - Sorbonne Paris Cité, Université Paris Diderot, 1 rue de Jussieu, 75005, Paris, France
| | - D Jézéquel
- UMR 7154 Institut de Physique du Globe de Paris - Sorbonne Paris Cité, Université Paris Diderot, 1 rue de Jussieu, 75005, Paris, France
| | - C Leboulanger
- UMR 9190 MARBEC, CNRS - Université de Montpellier - IRD - IFREMER, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
| | - V Grossi
- Laboratoire de Géologie de Lyon, Université de Lyon - CNRS - UCBL - ENSL, 69220 Villeurbanne, France
| | - M Ader
- UMR 7154 Institut de Physique du Globe de Paris - Sorbonne Paris Cité, Université Paris Diderot, 1 rue de Jussieu, 75005, Paris, France
| | - M Troussellier
- UMR 9190 MARBEC, CNRS - Université de Montpellier - IRD - IFREMER, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France
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Cellamare M, Duval C, Drelin Y, Djediat C, Touibi N, Agogué H, Leboulanger C, Ader M, Bernard C. Characterization of phototrophic microorganisms and description of new cyanobacteria isolated from the saline-alkaline crater-lake Dziani Dzaha (Mayotte, Indian Ocean). FEMS Microbiol Ecol 2019; 94:5033403. [PMID: 29878107 DOI: 10.1093/femsec/fiy108] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 06/03/2018] [Indexed: 11/14/2022] Open
Abstract
The saline-alkaline crater-lake Dziani Dzaha (Mayotte, Indian Ocean) is dominated by the bloom-forming cyanobacterium Arthrospira. However, the rest of the phototrophic community remains underexplored because of their minute dimension or lower biomass. To characterize the phototrophic microorganisms living in this ecosystem considered as a modern analog of Precambrian environments, several strains were isolated from the water column and stromatolites and analyzed using the polyphasic approach. Based on morphological, ultrastructural and molecular (16S rRNA gene, 18S rRNA gene, 16S-23S internal transcribed spacer (ITS) region and cpcBA-IGS locus) methods, seven filamentous cyanobacteria and the prasinophyte Picocystis salinarum were identified. Two new genera and four new cyanobacteria species belonging to the orders Oscillatoriales (Desertifilum dzianense sp. nov.) and Synechococcales (Sodalinema komarekii gen. nov., sp. nov., Sodaleptolyngbya stromatolitii gen. nov., sp. nov. and Haloleptolyngbya elongata sp. nov.) were described. This approach also allowed to identify Arthrospira fusiformis with exclusively straight trichomes instead of the spirally coiled form commonly observed in the genus. This study evidenced the importance of using the polyphasic approach to solve the complex taxonomy of cyanobacteria and to study algal assemblages from unexplored ecosystems.
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Affiliation(s)
- M Cellamare
- UMR 7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France.,Phyto-Quality, 15 rue Pétrarque, 75116 Paris, France
| | - C Duval
- UMR 7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - Y Drelin
- UMR 7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - C Djediat
- UMR 7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France.,Electron Microscopy Platform, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - N Touibi
- UMR 7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France.,Electron Microscopy Platform, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
| | - H Agogué
- UMR 7266 LIENSs CNRS, Université de La Rochelle, F-17000 La Rochelle, France
| | - C Leboulanger
- UMR 9190 MARBEC IRD-CNRS, Université de Montpellier-IFREMER, Avenue Jean Monnet, F-34200 Sète, France
| | - M Ader
- Institut de Physique du Globe de Paris-Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, F-75005 Paris, France
| | - C Bernard
- UMR 7245 MCAM MNHN-CNRS, Muséum National d'Histoire Naturelle, CP 39, 12 rue Buffon, F-75231 Paris Cedex 05, France
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15
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Duval C, Thore E, Bruneau L, Camuset G, Ricou-Berthelot A, Jaubert J, Von Theobald P, Franco JM, Poubeau P, Bertolotti A. Prévalence de Chlamydia trachomatis chez les femmes consultant en centres de dépistage à la Réunion : étude transversale. Ann Dermatol Venereol 2018. [DOI: 10.1016/j.annder.2018.09.474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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17
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Duval C, Nguyen H, Lebel K, Bogard S, Goubault E, Boissy P. Detection, segmentation, and assessment of daily living activities using inertial sensor in people with Parkinson’s disease during a cleaning task. Parkinsonism Relat Disord 2018. [DOI: 10.1016/j.parkreldis.2017.11.289] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Goubault E, Nguyen H, Bogard S, Faucher G, Duval C. Cardinal symptoms of Parkinson’s disease cohabit with levodopa-induced dyskinesia. Parkinsonism Relat Disord 2018. [DOI: 10.1016/j.parkreldis.2017.11.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Warrick E, Duval C, Nouveau S, Bastien P, Piffaut V, Chalmond B, Ortonne JP, de Lacharrière O, Bernerd F. Morphological and molecular characterization of actinic lentigos reveals alterations of the dermal extracellular matrix. Br J Dermatol 2017; 177:1619-1632. [DOI: 10.1111/bjd.15697] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/19/2017] [Indexed: 01/09/2023]
Affiliation(s)
- E. Warrick
- L'Oréal Research and Innovation; 1 avenue Eugène Schueller; Aulnay sous Bois 93600 France
| | - C. Duval
- L'Oréal Research and Innovation; 1 avenue Eugène Schueller; Aulnay sous Bois 93600 France
| | - S. Nouveau
- L'Oréal Research and Innovation; 1 avenue Eugène Schueller; Aulnay sous Bois 93600 France
| | - P. Bastien
- L'Oréal Research and Innovation; 1 avenue Eugène Schueller; Aulnay sous Bois 93600 France
| | - V. Piffaut
- L'Oréal Research and Innovation; 1 avenue Eugène Schueller; Aulnay sous Bois 93600 France
| | - B. Chalmond
- Center for Mathematical Studies and their Applications; Ecole Normale Supérieure; Cachan France
| | - J-P. Ortonne
- Department of Dermatology; CHU Archet-2; Nice France
| | - O. de Lacharrière
- L'Oréal Research and Innovation; 1 avenue Eugène Schueller; Aulnay sous Bois 93600 France
| | - F. Bernerd
- L'Oréal Research and Innovation; 1 avenue Eugène Schueller; Aulnay sous Bois 93600 France
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Affiliation(s)
- F. Comte
- MAP5, UMR CNRS 8145 Université Paris Descartes
| | - C. Duval
- MAP5, UMR CNRS 8145 Université Paris Descartes
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21
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Duval C, Fontaine J, Gazzo S, Desormaux P, Sujobert P, Mosnier I, Durieux E, Ghesquieres H, Sarkozy C, Isaac S, Traverse-Glehen A. Réarrangement du gène MYC et lymphomes B à grandes cellules : quand ? comment ? Ann Pathol 2017. [DOI: 10.1016/j.annpat.2017.06.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Boissy P, Blamoutier M, Duval C. QUANTIFICATION OF FREE-LIVING MOBILITY IN COMMUNITY LIVING OLDER ADULTS USING WEARABLE SENSORS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- P. Boissy
- Université de Sherbrooke/ Research Center on Aging, Sherbrooke, Quebec, Canada,
| | - M. Blamoutier
- Université du Québec à Montréal/ Institut Universitaire de Gériatrie de Montréal, Montréal, Quebec, Canada
| | - C. Duval
- Université du Québec à Montréal/ Institut Universitaire de Gériatrie de Montréal, Montréal, Quebec, Canada
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23
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Duval C, Teixeira-Clerc F, Leblanc AF, Touch S, Emond C, Guerre-Millo M, Lotersztajn S, Barouki R, Aggerbeck M, Coumoul X. Chronic Exposure to Low Doses of Dioxin Promotes Liver Fibrosis Development in the C57BL/6J Diet-Induced Obesity Mouse Model. Environ Health Perspect 2017; 125:428-436. [PMID: 27713108 PMCID: PMC5332187 DOI: 10.1289/ehp316] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 07/11/2016] [Accepted: 08/19/2016] [Indexed: 05/21/2023]
Abstract
BACKGROUND Exposure to persistent organic pollutants (POPs) has been associated with the progression of chronic liver diseases, yet the contribution of POPs to the development of fibrosis in non-alcoholic fatty liver disease (NAFLD), a condition closely linked to obesity, remains poorly documented. OBJECTIVES We investigated the effects of subchronic exposure to low doses of the POP 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), an aryl hydrocarbon receptor ligand, on NAFLD progression in diet-induced obese C57BL/6J mice. METHODS Male C57BL/6J mice were fed either a 10% low-fat (LFD) or a 45% high-fat (HFD) purified diet for 14 weeks and TCDD-exposed groups were injected once a week with 5 μg/kg TCDD or the vehicle for the last 6 weeks of the diet. RESULTS Liver histology and triglyceride levels showed that exposure of HFD fed mice to TCDD worsened hepatic steatosis, as compared to either HFD alone or LFD plus TCDD and the mRNA levels of key genes of hepatic lipid metabolism were strongly altered in co-treated mice. Further, increased liver collagen staining and serum transaminase levels showed that TCDD induced liver fibrosis in the HFD fed mice. TCDD in LFD fed mice increased the expression of several inflammation and fibrosis marker genes with no additional effect from a HFD. CONCLUSIONS Exposure to TCDD amplifies the impairment of liver functions observed in mice fed an enriched fat diet as compared to a low fat diet. The results provide new evidence that environmental pollutants promote the development of liver fibrosis in obesity-related NAFLD in C57BL/6J mice. Citation: Duval C, Teixeira-Clerc F, Leblanc AF, Touch S, Emond C, Guerre-Millo M, Lotersztajn S, Barouki R, Aggerbeck M, Coumoul X. 2017. Chronic exposure to low doses of dioxin promotes liver fibrosis development in the C57BL/6J diet-induced obesity mouse model. Environ Health Perspect 125:428-436; http://dx.doi.org/10.1289/EHP316.
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Affiliation(s)
- Caroline Duval
- INSERM UMR (Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche)-S1124, Paris, France
- Université Paris Descartes, ComUE (Communauté d’universités et d’établissements), Sorbonne Paris Cité, Paris, France
| | - Fatima Teixeira-Clerc
- INSERM UMR-S955, Hôpital Henri Mondor, Créteil, France
- Université Paris-Est, Créteil, France
| | - Alix F. Leblanc
- INSERM UMR (Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche)-S1124, Paris, France
- Université Paris Descartes, ComUE (Communauté d’universités et d’établissements), Sorbonne Paris Cité, Paris, France
| | - Sothea Touch
- INSERM UMR-S1166, Paris, France
- Université Pierre et Marie Curie, Paris, France
| | - Claude Emond
- Department of Environmental and Occupational Health, School of Public Health, Université de Montréal, Montreal, Quebec, Canada
| | | | - Sophie Lotersztajn
- INSERM UMR-S955, Hôpital Henri Mondor, Créteil, France
- Université Paris-Est, Créteil, France
| | - Robert Barouki
- INSERM UMR (Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche)-S1124, Paris, France
- Université Paris Descartes, ComUE (Communauté d’universités et d’établissements), Sorbonne Paris Cité, Paris, France
- AP-HP (Assistance Publique - Hôpitaux de Paris), Hôpital Necker-Enfants Malades, Paris, France
| | - Martine Aggerbeck
- INSERM UMR (Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche)-S1124, Paris, France
- Université Paris Descartes, ComUE (Communauté d’universités et d’établissements), Sorbonne Paris Cité, Paris, France
| | - Xavier Coumoul
- INSERM UMR (Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche)-S1124, Paris, France
- Université Paris Descartes, ComUE (Communauté d’universités et d’établissements), Sorbonne Paris Cité, Paris, France
- Address correspondence to X. Coumoul, INSERM UMR-S1124, Université Paris Descartes, 45 rue des Saints-Pères, 75006 Paris, France. Telephone: 33142863359. E-mail:
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25
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Attignon EA, Leblanc AF, Le-Grand B, Duval C, Aggerbeck M, Rouach H, Blanc EB. Novel roles for AhR and ARNT in the regulation of alcohol dehydrogenases in human hepatic cells. Arch Toxicol 2016; 91:313-324. [PMID: 27055685 DOI: 10.1007/s00204-016-1700-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 03/21/2016] [Indexed: 12/13/2022]
Abstract
The mechanisms by which pollutants participate in the development of diverse pathologies are not completely understood. The pollutant 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) activates the AhR (aryl hydrocarbon receptor) signaling pathway. We previously showed that TCDD (25 nM, 30 h) decreased the expression of several alcohol metabolism enzymes (cytochrome P450 2E1, alcohol dehydrogenases ADH1, 4 and 6) in differentiated human hepatic cells (HepaRG). Here, we show that, as rapidly as 8 h after treatment (25 nM TCDD) ADH expression decreased 40 % (p < 0.05). ADH1 and 4 protein levels decreased 40 and 27 %, respectively (p < 0.05), after 72 h (25 nM TCDD). The protein half-lives were not modified by TCDD which suggests transcriptional regulation of expression. The AhR antagonist CH-223191 or AhR siRNA reduced the inhibitory effect of 25 nM TCDD on ADH1A, 4 and 6 expression 50-100 % (p < 0.05). The genomic pathway (via the AhR/ARNT complex) and not the non-genomic pathway involving c-SRC mediated these effects. Other AhR ligands (3-methylcholanthrene and PCB 126) decreased ADH1B, 4 and 6 mRNAs by more than 78 and 55 %, respectively (p < 0.01). TCDD also regulated the expression of ADH4 in the HepG2 human hepatic cell line, in primary human hepatocytes and in C57BL/6J mouse liver. In conclusion, activation of the AhR/ARNT signaling pathway by AhR ligands represents a novel mechanism for regulating the expression of ADHs. These effects may be implicated in the toxicity of AhR ligands as well as in the alteration of ethanol or retinol metabolism and may be associated further with higher risk of liver diseases or/and alcohol abuse disorders.
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Affiliation(s)
- Eléonore A Attignon
- INSERM, UMR-S 1124, Toxicologie Pharmacologie et Signalisation Cellulaire, 45 rue des Saints Pères, F-75006, Paris, France.,ComUE Sorbonne Paris Cité, Université Paris Descartes, CICB-Paris, 45 rue des Saints Pères, F-75006, Paris, France
| | - Alix F Leblanc
- INSERM, UMR-S 1124, Toxicologie Pharmacologie et Signalisation Cellulaire, 45 rue des Saints Pères, F-75006, Paris, France.,ComUE Sorbonne Paris Cité, Université Paris Descartes, CICB-Paris, 45 rue des Saints Pères, F-75006, Paris, France
| | - Béatrice Le-Grand
- INSERM, UMR-S 1124, Toxicologie Pharmacologie et Signalisation Cellulaire, 45 rue des Saints Pères, F-75006, Paris, France.,ComUE Sorbonne Paris Cité, Université Paris Descartes, CICB-Paris, 45 rue des Saints Pères, F-75006, Paris, France
| | - Caroline Duval
- INSERM, UMR-S 1124, Toxicologie Pharmacologie et Signalisation Cellulaire, 45 rue des Saints Pères, F-75006, Paris, France.,ComUE Sorbonne Paris Cité, Université Paris Descartes, CICB-Paris, 45 rue des Saints Pères, F-75006, Paris, France
| | - Martine Aggerbeck
- INSERM, UMR-S 1124, Toxicologie Pharmacologie et Signalisation Cellulaire, 45 rue des Saints Pères, F-75006, Paris, France.,ComUE Sorbonne Paris Cité, Université Paris Descartes, CICB-Paris, 45 rue des Saints Pères, F-75006, Paris, France
| | - Hélène Rouach
- INSERM, UMR-S 1124, Toxicologie Pharmacologie et Signalisation Cellulaire, 45 rue des Saints Pères, F-75006, Paris, France.,ComUE Sorbonne Paris Cité, Université Paris Descartes, CICB-Paris, 45 rue des Saints Pères, F-75006, Paris, France
| | - Etienne B Blanc
- INSERM, UMR-S 1124, Toxicologie Pharmacologie et Signalisation Cellulaire, 45 rue des Saints Pères, F-75006, Paris, France. .,ComUE Sorbonne Paris Cité, Université Paris Descartes, CICB-Paris, 45 rue des Saints Pères, F-75006, Paris, France.
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26
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Duval C, Isaac S, Lifante JC, Decaussin-Petrucci M. [A rare tumor of the Ampulla of Vater]. Ann Pathol 2015; 35:528-30. [PMID: 26586086 DOI: 10.1016/j.annpat.2015.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 05/30/2015] [Accepted: 06/14/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Caroline Duval
- Service d'anatomo-pathologie, hôpital Lyon Sud, hospices Civils de Lyon, université Lyon I, 69495 Pierre Bénite cedex, France
| | - Sylvie Isaac
- Service d'anatomo-pathologie, hôpital Lyon Sud, hospices Civils de Lyon, université Lyon I, 69495 Pierre Bénite cedex, France
| | - Jean-christophe Lifante
- Service de chirurgie endocrinienne, hôpital Lyon Sud, Hospices Civils de Lyon, Université Lyon I, 69495 Pierre Bénite cedex, France
| | - Myriam Decaussin-Petrucci
- Service d'anatomo-pathologie, hôpital Lyon Sud, hospices Civils de Lyon, université Lyon I, 69495 Pierre Bénite cedex, France.
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27
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Casini A, Duval C, Pan X, Tintillier V, Biron-Andreani C, Ariëns RAS. Fibrin clot structure in patients with congenital dysfibrinogenaemia. Thromb Res 2015; 137:189-195. [PMID: 26577257 DOI: 10.1016/j.thromres.2015.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 10/29/2015] [Accepted: 11/06/2015] [Indexed: 12/17/2022]
Abstract
The clinical phenotype of patients with congenital dysfibrinogenaemia is highly heterogeneous, from absence of symptoms to mild bleeding, or thrombosis. A few mutations are associated with a specific phenotype, but generally the clinical course is not predictable. We investigated whether fibrin clot properties are correlated with the patient's phenotype and/or genotype. Ex vivo plasma fibrin clot characteristics, including turbidity, fibrinolysis, clot permeability and fibrin fibre density assessed by laser scanner confocal microscopy were investigated in 24 genotyped patients with congenital dysfibrinogenaemia compared to normal pool plasma. Compared to normal pool plasma, the patients were characterised by slower fibrin polymerisation (lag time, 345.10 ± 22.98 vs. 166.00s), thinner fibrin fibres (maximum absorbance, 0.15 ± 0.01 vs. 0.31), prolonged clot lysis time (23.72 ± 0.97 vs. 20.32 min) and larger clot pore size (21.5×10(-9) ± 4.48×10(-9) vs. 7.96×10(-9)cm(2)). Laser scanning confocal microscopy images confirmed disorganised fibrin networks in all patients. Patients with tendency to bleed showed an increased permeability compared to asymptomatic patients (p=0.01) and to patients with a thrombotic history (p=0.02) while patients with thrombotic history had a tendency to have a prolonged clot lysis time. Fibrin clot properties were similar among hotspot mutations. Further studies including a larger number of patients are needed to evaluate whether analysis of permeability and clot lysis time may help to distinguish the clinical phenotype in these patients and to assess differences according to the genotype.
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Affiliation(s)
- A Casini
- Angiology and Haemostasis Division, University Hospitals of Geneva and Faculty of Medicine, Geneva, Switzerland; Theme Thrombosis, Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine and Multidisciplinary Cardiovascular Research Centre, Faculty of Medicine and Health, University of Leeds, Leeds, UK.
| | - C Duval
- Theme Thrombosis, Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine and Multidisciplinary Cardiovascular Research Centre, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - X Pan
- Theme Thrombosis, Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine and Multidisciplinary Cardiovascular Research Centre, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - V Tintillier
- Institut Hématologie Transfusion, Pôle Biologie Pathologie Génétique, CHRU, Lille, France
| | - C Biron-Andreani
- Department of Biological Haematology and Haemophilia Treatment Centre, University Hospital Saint Eloi, Montpellier, France
| | - R A S Ariëns
- Theme Thrombosis, Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine and Multidisciplinary Cardiovascular Research Centre, Faculty of Medicine and Health, University of Leeds, Leeds, UK
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Hethershaw EL, Cilia La Corte AL, Duval C, Ali M, Grant PJ, Ariëns RAS, Philippou H. The effect of blood coagulation factor XIII on fibrin clot structure and fibrinolysis. J Thromb Haemost 2014; 12:197-205. [PMID: 24261582 DOI: 10.1111/jth.12455] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Indexed: 11/27/2022]
Abstract
BACKGROUND Factor XIII is a 320 kDa tetramer, comprising two enzymatic A-subunits and two carrier B-subunits (FXIII A₂ B₂). Activated FXIII (FXIIIa) catalyses the formation of ε-(γ-glutamyl)lysyl covalent bonds between γ-γ, γ-α and α-α chains of adjacent fibrin molecules and also cross-links the major plasmin inhibitor, α2-antiplasmin, to fibrin. OBJECTIVES We investigated the role of FXIII cross-linking of fibrin directly in clot morphology and its functional effect on clot formation and lysis, in the absence of α2-antiplasmin. RESULTS AND CONCLUSIONS Our data show that the presence of FXIII during clot formation results in fibrin clots that have a significant 2.1-fold reduction in pore size, as determined by the Darcy constant, Ks, and formed thinner fibers (74.7 ± 1.5 nm) and higher density of fibers compared with those without FXIII (86.0 ± 1.7 nm, P < 0.001), as determined by scanning electron microscopy. Additionally, fibrinolysis showed a significant increase in the time to lysis for clots formed in the presence of FXIII in both static and flow systems. These data demonstrate that independent of α2-antiplasmin, FXIII activity plays a role in increasing the stability of the fibrin clot by altering its structure and increasing the resistance to fibrinolysis.
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Affiliation(s)
- E L Hethershaw
- Division of Cardiovascular and Diabetes Research, Multidisciplinary Cardiovascular Research Centre, Faculty of Medicine and Health, Leeds Institute for Genetics Health and Therapeutics, University of Leeds, Leeds, UK
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Duval C, Beuter A, Gauthier S. Fluctuations in tremor at rest and saccadic eye movements in subjects with Parkinsons disease. Parkinsonism Relat Disord 2012; 3:195-205. [PMID: 18591076 DOI: 10.1016/s1353-8020(97)00019-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/1997] [Indexed: 11/15/2022]
Abstract
This study investigates the possible relationships between fluctuations in finger tremor amplitude and the performance of visual saccades. Saccadic eye movements were analyzed in five subjects with Parkinson's disease (PD) and five age-matched controls. Tremor was recorded by using a position laser system, and eye movements were recorded with an infrared reflectometry technique (Ober2). Tremor amplitude (root mean square) was significantly larger in the group of subjects with PD (2.87 +/- 4.37 mm) than in the control group (0.017 +/- 0.005 mm, U = 0, p < 0.01). In addition, subjects with PD showed more fluctuations in their tremor at rest (0.52 +/- 0.98 mm versus 0.003 +/- 0.006 mm, U = 1, p < 0.05). Latency, saccade error and percentage of predictive saccades were not significantly different between subjects with PD and control subjects. Average saccade amplitude was smaller in the group of subjects with PD (16.1 +/- 2.31 degrees ) than in the control group (18.49 +/- 3.62 degrees , U = 1, p < 0.05). Spearman's rank correlation coefficient showed no direct relationship between saccade amplitude and changes in tremor amplitude at the time of each saccade but, in general, subjects with PD who had more fluctuations in their tremor at rest had also more fluctuations in their saccade error (Rho = 0.9). These results suggest that the mechanisms causing short-term fluctuations in tremor at rest do not directly influence the visual saccadic system.
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Affiliation(s)
- C Duval
- Department of Kinanthropology, University of Québec at Montréal, Montréal, Canada
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de Wit N, Derrien M, Bosch-Vermeulen H, Oosterink E, Keshtkar S, Duval C, de Vogel-van den Bosch J, Kleerebezem M, Müller M, van der Meer R. Saturated fat stimulates obesity and hepatic steatosis and affects gut microbiota composition by an enhanced overflow of dietary fat to the distal intestine. Am J Physiol Gastrointest Liver Physiol 2012; 303:G589-99. [PMID: 22700822 DOI: 10.1152/ajpgi.00488.2011] [Citation(s) in RCA: 283] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We studied the effect of dietary fat type, varying in polyunsaturated-to-saturated fatty acid ratios (P/S), on development of metabolic syndrome. C57Bl/6J mice were fed purified high-fat diets (45E% fat) containing palm oil (HF-PO; P/S 0.4), olive oil (HF-OO; P/S 1.1), or safflower oil (HF-SO; P/S 7.8) for 8 wk. A low-fat palm oil diet (LF-PO; 10E% fat) was used as a reference. Additionally, we analyzed diet-induced changes in gut microbiota composition and mucosal gene expression. The HF-PO diet induced a higher body weight gain and liver triglyceride content compared with the HF-OO, HF-SO, or LF-PO diet. In the intestine, the HF-PO diet reduced microbial diversity and increased the Firmicutes-to-Bacteroidetes ratio. Although this fits a typical obesity profile, our data clearly indicate that an overflow of the HF-PO diet to the distal intestine, rather than obesity itself, is the main trigger for these gut microbiota changes. A HF-PO diet-induced elevation of lipid metabolism-related genes in the distal small intestine confirmed the overflow of palm oil to the distal intestine. Some of these lipid metabolism-related genes were previously already associated with the metabolic syndrome. In conclusion, our data indicate that saturated fat (HF-PO) has a more stimulatory effect on weight gain and hepatic lipid accumulation than unsaturated fat (HF-OO and HF-SO). The overflow of fat to the distal intestine on the HF-PO diet induced changes in gut microbiota composition and mucosal gene expression. We speculate that both are directly or indirectly contributive to the saturated fat-induced development of obesity and hepatic steatosis.
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Affiliation(s)
- Nicole de Wit
- Top Institute Food and Nutrition, Wageningen, the Netherlands
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Giraudeau M, Czirják GÁ, Duval C, Bretagnolle V, Gutierrez C, Guillon N, Heeb P. Effect of preen oil on plumage bacteria: an experimental test with the mallard. Behav Processes 2012; 92:1-5. [PMID: 22940115 DOI: 10.1016/j.beproc.2012.08.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Revised: 08/01/2012] [Accepted: 08/01/2012] [Indexed: 01/26/2023]
Abstract
Feathers are essential for avian thermoregulation, communication or flight and a reduction of plumage condition may alter these functions and reduce individual fitness. Recently, descriptive studies provided evidence that birds carry feather-degrading bacteria on their plumage that have the ability to degrade feathers rapidly under laboratory conditions. If such bacteria reduce avian fitness, natural selection should favour the evolution of anti-bacterial defences to limit the effects of these detrimental microorganisms. Preening behaviour and associated preen gland secretions have been proposed as the main factor used by birds to limit feather-degrading bacterial growth and some recent in vitro studies provided evidence that uropygial oil inhibited the growth of some keratinolytic strains in passerines. However, preen oil antimicrobial properties remained to be experimentally tested in vivo. We conducted an experiment with mallards (Anas platyrhynchos) onto which we fixed a removable mechanism that blocked access to the uropygial gland in a first group of mallards, whilst birds in a second group had the same removable mechanism but access to their gland and a third group of birds had normal access to their gland. We found no significant effect of our treatment on total and feather-degrading bacterial loads. Three hypotheses may explain the discrepancy between our results and previous in vitro studies. First, in vitro studies may have over-estimated the bactericidal properties of the preen oil. Second, preen gland deprivation may have affected only a small portion of the feather-degrading bacterial community. Third, ducks and passerine oils might have different bactericidal properties.
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Affiliation(s)
- M Giraudeau
- Laboratoire Évolution et Diversité Biologique (EDB), UMR 5174 Centre National de la Recherche Scientifique (CNRS), Université Paul Sabatier (UPS), Ecole Nationale de Formation Agronomique (ENFA), 118 Route de Narbonne, F-31062 Toulouse, France.
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Daneault JF, Carignan B, Barbat-Artigas S, Plouffe S, Villeneuve P, Aubertin-Leheudre M, Duval C, Sadikot A. 2.312 RELATIONSHIP BETWEEN QUALITY OF LIFE, PHYSICAL ACTIVITY AND LIFE-SPACE IN ADVANCED PARKINSON'S DISEASE BEFORE AND AFTER STN DBS. Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70635-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Infante MA, Humber CC, Mattson SN, Riley EP, Bryan AD, Ewing SF, Brock A, Magnan R, Hutchison K, Berglund KJ, Fahlke C, Berggren U, Zetterberg H, Blennow K, Engel J, Balldin J, Ulmer A, Lehert P, Mason B, Beaunieux H, Cauvin C, Lannuzel C, Duval C, Le Berre A, Vabret F, Pitel A, Allain P, Desgranges B, Eustache F. FREE ORAL COMMUNICATIONS 4: ALCOHOL DEPENDENCE: TREATMENT APPROACHES * O4.1 * EFFECTIVENESS OF STIMULANT MEDICATION IN FETAL ALCOHOL SPECTRUM DISORDERS. Alcohol Alcohol 2011. [DOI: 10.1093/alcalc/agr096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Stienstra R, Duval C, Müller M, Kersten S. PPARs, Obesity, and Inflammation. PPAR Res 2011; 2007:95974. [PMID: 17389767 PMCID: PMC1783744 DOI: 10.1155/2007/95974] [Citation(s) in RCA: 188] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Revised: 11/13/2006] [Accepted: 11/13/2006] [Indexed: 01/12/2023] Open
Abstract
The worldwide prevalence of obesity and related metabolic disorders is rising rapidly, increasing the burden on our healthcare system. Obesity is often accompanied by excess fat storage in tissues other than adipose tissue, including liver and skeletal muscle, which may lead to local insulin resistance and may stimulate inflammation, as in steatohepatitis. In addition, obesity changes the morphology and composition of adipose tissue, leading to changes in protein production and secretion. Some of these secreted proteins, including several proinflammatory mediators, may be produced by macrophages resident in the adipose tissue. The changes in inflammatory status of adipose tissue and liver with obesity feed a growing recognition that obesity represents a state of chronic low-level inflammation. Various molecular mechanisms have been implicated in obesity-induced inflammation, some of which are modulated by the peroxisome proliferator-activated receptors (PPARs). PPARs are ligand-activated transcription factors involved in the regulation of numerous biological processes, including lipid and glucose metabolism, and overall energy homeostasis. Importantly, PPARs also modulate the inflammatory response, which makes them an interesting therapeutic target to mitigate obesity-induced inflammation and its consequences. This review will address the role of PPARs in obesity-induced inflammation specifically in adipose tissue, liver, and the vascular wall.
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Affiliation(s)
- Rinke Stienstra
- Nutrition, Metabolism and Genomics Group and Nutrigenomics Consortium, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
| | - Caroline Duval
- Nutrition, Metabolism and Genomics Group and Nutrigenomics Consortium, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
| | - Michael Müller
- Nutrition, Metabolism and Genomics Group and Nutrigenomics Consortium, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
| | - Sander Kersten
- Nutrition, Metabolism and Genomics Group and Nutrigenomics Consortium, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
- *Sander Kersten:
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Giraudeau M, Duval C, Czirják GA, Bretagnolle V, Eraud C, McGraw KJ, Heeb P. Maternal investment of female mallards is influenced by male carotenoid-based coloration. Proc Biol Sci 2011; 278:781-8. [PMID: 20843851 PMCID: PMC3030838 DOI: 10.1098/rspb.2010.1115] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Accepted: 08/24/2010] [Indexed: 02/02/2023] Open
Abstract
The differential allocation hypothesis predicts that females modify their investment in a breeding attempt according to its reproductive value. One prediction of this hypothesis is that females will increase reproductive investment when mated to high-quality males. In birds, it was shown that females can modulate pre-hatch reproductive investment by manipulating egg and clutch sizes and/or the concentrations of egg internal compounds according to paternal attractiveness. However, the differential allocation of immune factors has seldom been considered, particularly with an experimental approach. The carotenoid-based ornaments can function as reliable signals of quality, indicating better immunity or ability to resist parasites. Thus, numerous studies show that females use the expression of carotenoid-based colour when choosing mates; but the influence of this paternal coloration on maternal investment decisions has seldom been considered and has only been experimentally studied with artificial manipulation of male coloration. Here, we used dietary carotenoid provisioning to manipulate male mallard (Anas platyrhynchos) bill coloration, a sexually selected trait, and followed female investment. We show that an increase of male bill coloration positively influenced egg mass and albumen lysozyme concentration. By contrast, yolk carotenoid concentration was not affected by paternal ornamentation. Maternal decisions highlighted in this study may influence chick survival and compel males to maintain carotenoid-based coloration from the mate-choice period until egg-laying has been finished.
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Affiliation(s)
- M Giraudeau
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, USA.
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Duval C, Thissen U, Keshtkar S, Accart B, Stienstra R, Boekschoten MV, Roskams T, Kersten S, Müller M. Adipose tissue dysfunction signals progression of hepatic steatosis towards nonalcoholic steatohepatitis in C57BL/6 mice. Diabetes 2010; 59:3181-91. [PMID: 20858684 PMCID: PMC2992781 DOI: 10.2337/db10-0224] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Nonalcoholic fatty liver disease (NAFLD) is linked to obesity and diabetes, suggesting an important role of adipose tissue in the pathogenesis of NAFLD. Here, we aimed to investigate the interaction between adipose tissue and liver in NAFLD and identify potential early plasma markers that predict nonalcoholic steatohepatitis (NASH). RESEARCH DESIGN AND METHODS C57Bl/6 mice were chronically fed a high-fat diet to induce NAFLD and compared with mice fed a low-fat diet. Extensive histological and phenotypical analyses coupled with a time course study of plasma proteins using multiplex assay were performed. RESULTS Mice exhibited pronounced heterogeneity in liver histological scoring, leading to classification into four subgroups: low-fat low (LFL) responders displaying normal liver morphology, low-fat high (LFH) responders showing benign hepatic steatosis, high-fat low (HFL) responders displaying pre-NASH with macrovesicular lipid droplets, and high fat high (HFH) responders exhibiting overt NASH characterized by ballooning of hepatocytes, presence of Mallory bodies, and activated inflammatory cells. Compared with HFL responders, HFH mice gained weight more rapidly and exhibited adipose tissue dysfunction characterized by decreased final fat mass, enhanced macrophage infiltration and inflammation, and adipose tissue remodeling. Plasma haptoglobin, IL-1β, TIMP-1, adiponectin, and leptin were significantly changed in HFH mice. Multivariate analysis indicated that in addition to leptin, plasma CRP, haptoglobin, eotaxin, and MIP-1α early in the intervention were positively associated with liver triglycerides. Intermediate prognostic markers of liver triglycerides included IL-18, IL-1β, MIP-1γ, and MIP-2, whereas insulin, TIMP-1, granulocyte chemotactic protein 2, and myeloperoxidase emerged as late markers. CONCLUSIONS Our data support the existence of a tight relationship between adipose tissue dysfunction and NASH pathogenesis and point to several novel potential predictive biomarkers for NASH.
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Affiliation(s)
- Caroline Duval
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
| | - Uwe Thissen
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
- TNO Quality of Life, Zeist, the Netherlands
| | - Shohreh Keshtkar
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
| | - Bertrand Accart
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
| | - Rinke Stienstra
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
| | - Mark V. Boekschoten
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
| | - Tania Roskams
- Liver Research Unit, Department of Morphology and Molecular Pathology, University of Leuven, Leuven, Belgium
| | - Sander Kersten
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
- Corresponding author: Sander Kersten,
| | - Michael Müller
- Nutrition, Metabolism and Genomics Group, Division of Human Nutrition, Wageningen University, Wageningen, the Netherlands
- Nutrigenomics Consortium, Top Institute Food & Nutrition, Wageningen, the Netherlands
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Stienstra R, Saudale F, Duval C, Keshtkar S, Groener JEM, van Rooijen N, Staels B, Kersten S, Müller M. Kupffer cells promote hepatic steatosis via interleukin-1beta-dependent suppression of peroxisome proliferator-activated receptor alpha activity. Hepatology 2010; 51:511-22. [PMID: 20054868 DOI: 10.1002/hep.23337] [Citation(s) in RCA: 340] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
UNLABELLED Kupffer cells have been implicated in the pathogenesis of various liver diseases. However, their involvement in metabolic disorders of the liver, including fatty liver disease, remains unclear. The present study sought to determine the impact of Kupffer cells on hepatic triglyceride storage and to explore the possible mechanisms involved. To that end, C57Bl/6 mice rendered obese and steatotic by chronic high-fat feeding were treated for 1 week with clodronate liposomes, which cause depletion of Kupffer cells. Loss of expression of marker genes Cd68, F4/80, and Clec4f, and loss of Cd68 immunostaining verified almost complete removal of Kupffer cells from the liver. Also, expression of complement components C1, the chemokine (C-C motif) ligand 6 (Ccl6), and cytokines interleukin-15 (IL-15) and IL-1beta were markedly reduced. Importantly, Kupffer cell depletion significantly decreased liver triglyceride and glucosylceramide levels concurrent with increased expression of genes involved in fatty acid oxidation including peroxisome proliferator-activated receptor alpha (PPARalpha), carnitine palmitoyltransferase 1A (Cpt1alpha), and fatty acid transport protein 2 (Fatp2). Treatment of mice with IL-1beta decreased expression of PPARalpha and its target genes, which was confirmed in primary hepatocytes. Consistent with these data, IL-1beta suppressed human and mouse PPARalpha promoter activity. Suppression of PPARalpha promoter activity was recapitulated by overexpression of nuclear factor kappaB (NF-kappaB) subunit p50 and p65, and was abolished upon deletion of putative NF-kappaB binding sites. Finally, IL-1beta and NF-kappaB interfered with the ability of PPARalpha to activate gene transcription. CONCLUSION Our data point toward important cross-talk between Kupffer cells and hepatocytes in the regulation of hepatic triglyceride storage. The effect of Kupffer cells on liver triglycerides are at least partially mediated by IL-1beta, which suppresses PPARalpha expression and activity.
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Affiliation(s)
- Rinke Stienstra
- Nutrigenomics Consortium, TI Food and Nutrition, Wageningen, The Netherlands
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Duval C, Keshtkar S, Boekschoten M, de Groot P, Jansen J, Roskams T, Kersten S, Müller M. Adipose tissue failure signals the evolution of hepatic steatosis towards nonalcoholic steatohepatitis (NASH) in the C57BL/6 DIET-induced obesity mouse model. Chem Phys Lipids 2008. [DOI: 10.1016/j.chemphyslip.2008.05.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Stienstra R, Duval C, Keshtkar S, van der Laak J, Kersten S, Müller M. Peroxisome proliferator-activated receptor gamma activation promotes infiltration of alternatively activated macrophages into adipose tissue. J Biol Chem 2008; 283:22620-7. [PMID: 18541527 DOI: 10.1074/jbc.m710314200] [Citation(s) in RCA: 149] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Obesity is associated with infiltration of macrophages into adipose tissue. Adipose macrophages may contribute to an elevated inflammatory status by secreting a variety of proinflammatory mediators, including tumor necrosis factor alpha and interleukin-6 (IL-6). Recent data suggest that during diet-induced obesity the phenotype of adipose-resident macrophages changes from alternatively activated macrophages toward a more classical and pro-inflammatory phenotype. Here, we explore the effect of peroxisome proliferator-activated receptor gamma activation on obesity-induced inflammation in 129SV mice fed a high fat diet for 20 weeks. High fat feeding increased bodyweight gain, adipose tissue mass, and liver triglycerides. Rosiglitazone treatment further increased adipose mass, reduced liver triglycerides, and changed adipose tissue morphology toward smaller adipocytes. Surprisingly, rosiglitazone markedly increased the number of macrophages in adipose tissue, as shown by immunohistochemical analysis and quantification of macrophage marker genes CD68 and F4/80+. In adipose tissue, markers for classically activated macrophages including IL-18 were down-regulated, whereas markers characteristic for alternatively activated macrophages (arginase 1, IL-10) were up-regulated by rosiglitazone. Importantly, conditioned media from rosiglitazone-treated alternatively activated macrophages neutralized the inhibitory effect of macrophages on 3T3-L1 adipocyte differentiation, suggesting that alternatively activated macrophages may be involved in mediating the effects of rosiglitazone on adipose tissue morphology and mass. Our results suggest that short term rosiglitazone treatment increases infiltration of alternatively activated macrophages in adipose tissue. The alternatively activated macrophages might play a role in peroxisome proliferator-activated receptor gamma-dependent expansion and remodeling of adipose tissue.
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Affiliation(s)
- Rinke Stienstra
- Nutrition, Metabolism, and Genomics Group, Division of Human Nutrition, Wageningen University, 6700 EV Wageningen, The Netherlands
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Léger A, Farret R, Duval C, Levrat E, Weber P, Iung B. A safety barriers-based approach for the risk analysis of socio-technical systems. ACTA ACUST UNITED AC 2008. [DOI: 10.3182/20080706-5-kr-1001.01176] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Duval C, Müller M, Kersten S. PPARalpha and dyslipidemia. Biochim Biophys Acta Mol Cell Biol Lipids 2007; 1771:961-71. [PMID: 17604218 DOI: 10.1016/j.bbalip.2007.05.003] [Citation(s) in RCA: 155] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2006] [Revised: 04/22/2007] [Accepted: 05/25/2007] [Indexed: 12/27/2022]
Abstract
Dyslipidemia is defined by abnormal levels of plasma lipoproteins. Several different types of dyslipidemia can be distinguished. An important group of drugs used in the treatment of dyslipidemia are the fibrates. Fibrates serve as agonists for the peroxisome proliferator-activated receptor alpha (PPARalpha), a ligand-activated transcription factor that belongs to the superfamily of nuclear hormone receptors. By binding to response elements mostly present in the promoter of target genes, PPARalpha governs the expression of numerous genes involved in a variety of metabolic processes. Activation of PPARalpha results in a reduction of plasma TG levels, which is achieved by: (1) induction of genes that decrease the availability of TG for hepatic VLDL secretion, and (2) induction of genes that promote lipoprotein lipase-mediated lipolysis of TG-rich plasma lipoproteins. The stimulatory effect of PPARalpha on plasma HDL levels in humans, which is opposite to what is observed in mice, appears to be mainly mediated via increased production of APOA1 and APOA2, the apolipoprotein constituents of HDL. Apart from its major actions outlined above, PPARalpha modulates lipoprotein metabolism in several other ways, mostly via direct up-regulation of specific PPARalpha target genes. By taking into account novel insights into the metabolism of plasma lipoproteins and by considering the latest information on PPARalpha-dependent gene regulation, a fresh perspective on the molecular mechanisms underlying the plasma lipoprotein modulating effect of PPARalpha is presented.
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Affiliation(s)
- Caroline Duval
- Nutrition, Metabolism and Genomics Group and Nutrigenomics Consortium, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, Netherlands
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Duval C, Horváth Z, Horváthy PA, Martina L, Stichel PC. Comment on "Berry phase correction to electron density of states in solids". Phys Rev Lett 2006; 96:099701; author reply 099702. [PMID: 16606328 DOI: 10.1103/physrevlett.96.099701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2005] [Indexed: 05/08/2023]
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Duval C, Touche V, Tailleux A, Fruchart JC, Fievet C, Clavey V, Staels B, Lestavel S. Niemann-Pick C1 like 1 gene expression is down-regulated by LXR activators in the intestine. Biochem Biophys Res Commun 2006; 340:1259-63. [PMID: 16414355 DOI: 10.1016/j.bbrc.2005.12.137] [Citation(s) in RCA: 138] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2005] [Accepted: 12/20/2005] [Indexed: 11/16/2022]
Abstract
Niemann-Pick C1 like 1 (NPC1L1) is a protein critical for intestinal cholesterol absorption. The nuclear receptors peroxisome proliferator-activated receptor alpha (PPARalpha) and liver X receptors (LXRalpha and LXRbeta) are major regulators of cholesterol homeostasis and their activation results in a reduced absorption of intestinal cholesterol. The goal of this study was to define the role of PPARalpha and LXR nuclear receptors in the regulation of NPC1L1 gene expression. We show that LXR activators down-regulate NPC1L1 mRNA levels in the human enterocyte cell line Caco-2/TC7, whereas PPARalpha ligands have no effect. Furthermore, NPC1L1 mRNA levels are decreased in vivo, in duodenum of mice treated with the LXR agonist T0901317. In conclusion, the present study identifies NPC1L1 as a novel LXR target gene further supporting a crucial role of LXR in intestinal cholesterol homeostasis.
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Affiliation(s)
- Caroline Duval
- Institut Pasteur de Lille, Département d'Athérosclérose, Lille F-59019, France
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Lestavel S, Duval C, Touches V, Tailleux A, Carriere V, Fruchart J, Staels B, Clavey V. W15-P-005 Regulation of genes encoding intestinal cholesterol transporters by nuclear receptors in human CACO-2/TC7 enterocytes. ATHEROSCLEROSIS SUPP 2005. [DOI: 10.1016/s1567-5688(05)80386-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sandberg MB, Bloksgaard M, Duran-Sandoval D, Duval C, Staels B, Mandrup S. The Gene Encoding Acyl-CoA-binding Protein Is Subject to Metabolic Regulation by Both Sterol Regulatory Element-binding Protein and Peroxisome Proliferator-activated Receptor α in Hepatocytes. J Biol Chem 2005; 280:5258-66. [PMID: 15611101 DOI: 10.1074/jbc.m407515200] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The acyl-CoA-binding protein (ACBP) is a 10-kDa intracellular lipid-binding protein that transports acylCoA esters. The protein is expressed in most cell types at low levels; however, expression is particularly high in cells with a high turnover of fatty acids. Here we confirm a previous observation that ACBP expression in rodent liver is down-regulated by fasting, and we show that insulin but not glucose is the inducer of ACBP expression in primary rat hepatocytes. In keeping with the regulation by insulin, we show that ACBP is a sterol regulatory element-binding protein 1c (SREBP-1c) target gene in hepatocytes. Members of the SREBP family activate the rat ACBP gene through binding sites for SREBP and the auxiliary factors Sp1 and nuclear factor Y in the proximal promoter. In addition, we show that ACBP is a peroxisome proliferator-activated receptor (PPAR) alpha target gene in cultured hepatocytes and is induced in the liver by fibrates in a PPARalpha-dependent manner. Thus, ACBP is a dual PPARalpha and SREBP-1c target gene in hepatocytes. Fasting leads to reduced activity of SREBP but increased activity of PPARalpha in hepatocytes, and in keeping with ACBP being a dual target gene, we show that ACBP expression is significantly lower in livers from PPARalpha knock-out mice than in livers from wild type mice. In conclusion, expression of ACBP in rodent hepatocytes is subject to dual metabolic regulation by PPARalpha and SREBP-1c, which may reflect the need for ACBP during lipogenic as well as lipo-oxidative conditions.
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Affiliation(s)
- Maria B Sandberg
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
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Abstract
Young French children have 45,000,000 domestic pets, cats and dogs being widely prevalent (40%). Injuries due to domestic animals, especially bites, in particular from dogs, represent 1.9% of all children's injuries. On the quality of first aid in the field, i.e., whether the treatment is the first line in surgical specialized service or not, if it is a vital emergency, will depend the possibility of immediate complications, which include local superinfection (15%), functionals and further aesthetic sequelae. Some injuries due to large animals carry a polytraumatism, which should be treated like all polytraumatisms, whatever the aetiology. Learning to know and respect animals and their needs should remain the priority of families to avoid unexpected injury. Families also need to take charge of the responsible animal.
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Affiliation(s)
- J Lavaud
- SMUR pediatrique, hôpital Necker-Enfants-Malades, 149 rue de Sèvres, 75743 Paris cedex 15, France
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Duval C, Fruchart JC, Staels B. PPAR alpha, fibrates, lipid metabolism and inflammation. Arch Mal Coeur Vaiss 2004; 97:665-72. [PMID: 15283041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Peroxisome proliferator-activated receptors (PPARs) are lipid-activated transcription factors belonging to the nuclear receptor superfamily. Three PPAR isotypes have been characterised: alpha, beta/delta and gamma. Identification of selective ligands and gene targeting studies have allowed determination of subtype-specific functions and the therapeutic potential of these receptors. Thus, PPAR alpha plays a prominent role in several physiological processes including the control of lipid and lipoprotein metabolism, glucose homoeostasis and the inflammatory response. Here, we update the potential of PPAR alpha activation in the treatment of metabolic disorders and related cardiovascular complications.
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Affiliation(s)
- C Duval
- U.545 Inserm, département d'athérosclérose, Institut Pasteur de Lille, France
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Bonnefoi H, Diebold-Berger S, Therasse P, Hamilton A, van de Vijver M, MacGrogan G, Shepherd L, Amaral N, Duval C, Drijkoningen R, Larsimont D, Piccart M. Locally advanced/inflammatory breast cancers treated with intensive epirubicin-based neoadjuvant chemotherapy: are there molecular markers in the primary tumour that predict for 5-year clinical outcome? Ann Oncol 2003; 14:406-13. [PMID: 12598346 DOI: 10.1093/annonc/mdg108] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Locally advanced and/or inflammatory breast cancer (LABC) is a heterogeneous disease. Molecular markers may help to understand this heterogeneity. This paper reports the results of a study assessing the potential prognostic or predictive value of HER-2, p53, cyclinD1, MIB1, ER and PgR expression by immunohistochemistry from patients included in an EORTC-NCIC-SAKK trial. PATIENTS AND METHODS A total of 448 patients with a cytological or histological diagnosis of LABC were randomised into a trial comparing two anthracycline-based neoadjuvant regimens. Chemotherapy was followed by standard locoregional therapy. Survival was comparable in both arms. We collected and analysed centrally paraffin-embedded tumour specimens from 187 (72.5%) of 258 patients that had a histological diagnosis. RESULTS Of the patients included in this molecular marker study 114 relapsed and 91 died. In the multivariate analysis p53 positivity was associated with a shorter progression-free survival [hazard ratio (HR) = 1.96; 95% CI 1.33-2.91; P = 0.0008) and a shorter overall survival (HR = 1.98; 95% CI 1.28-3.06; P = 0.002). PgR positivity predicted for a longer overall survival (HR = 0.54; 95% CI 0.35-0.83; P = 0.0045). CONCLUSIONS p53 was an independent factor predicting for survival. In order to clarify whether p53 is a pure prognostic and/or a predictive factor, a phase III trial is being conducted (EORTC 10994/BIG 00-01 study) using functional assay in yeast from frozen tumour samples.
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MESH Headings
- Administration, Oral
- Adult
- Aged
- Anthracyclines/therapeutic use
- Antineoplastic Combined Chemotherapy Protocols/administration & dosage
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Biomarkers, Tumor/analysis
- Breast Neoplasms/drug therapy
- Breast Neoplasms/pathology
- Cyclin D1/biosynthesis
- Cyclin D1/blood
- Cyclophosphamide/administration & dosage
- Epirubicin/administration & dosage
- Female
- Fluorouracil/administration & dosage
- Gene Expression Regulation, Neoplastic
- Granulocyte Colony-Stimulating Factor/administration & dosage
- Humans
- Immunohistochemistry
- Infusions, Intravenous
- Ki-67 Antigen/analysis
- Ki-67 Antigen/biosynthesis
- Middle Aged
- Neoadjuvant Therapy
- Predictive Value of Tests
- Prognosis
- Receptor, ErbB-2/biosynthesis
- Receptor, ErbB-2/blood
- Receptors, Estrogen/analysis
- Receptors, Estrogen/biosynthesis
- Receptors, Progesterone/analysis
- Receptors, Progesterone/biosynthesis
- Survival Analysis
- Treatment Outcome
- Tumor Suppressor Protein p53/biosynthesis
- Tumor Suppressor Protein p53/blood
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Affiliation(s)
- H Bonnefoi
- Hôpitaux Universitaires de Genève, Geneva, Switzerland.
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Pineda Torra I, Claudel T, Duval C, Kosykh V, Fruchart JC, Staels B. Bile acids induce the expression of the human peroxisome proliferator-activated receptor alpha gene via activation of the farnesoid X receptor. Mol Endocrinol 2003; 17:259-72. [PMID: 12554753 DOI: 10.1210/me.2002-0120] [Citation(s) in RCA: 319] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Peroxisome proliferator-activated receptor alpha (PPARalpha) is a nuclear receptor that controls lipid and glucose metabolism and exerts antiinflammatory activities. PPARalpha is also reported to influence bile acid formation and bile composition. Farnesoid X receptor (FXR) is a bile acid-activated nuclear receptor that mediates the effects of bile acids on gene expression and plays a major role in bile acid and possibly also in lipid metabolism. Thus, both PPARalpha and FXR appear to act on common metabolic pathways. To determine the existence of a molecular cross-talk between these two nuclear receptors, the regulation of PPARalpha expression by bile acids was investigated. Incubation of human hepatoma HepG2 cells with the natural FXR ligand chenodeoxycholic acid (CDCA) as well as with the nonsteroidal FXR agonist GW4064 resulted in a significant induction of PPARalpha mRNA levels. In addition, hPPARalpha gene expression was up-regulated by taurocholic acid in human primary hepatocytes. Cotransfection of FXR/retinoid X receptor in the presence of CDCA led to up to a 3-fold induction of human PPARalpha promoter activity in HepG2 cells. Mutation analysis identified a FXR response element in the human PPARalpha promoter (alpha-FXR response element (alphaFXRE)] that mediates bile acid regulation of this promoter. FXR bound the alphaFXRE site as demonstrated by gel shift analysis, and CDCA specifically increased the activity of a heterologous promoter driven by four copies of the alphaFXRE. In contrast, neither the murine PPARalpha promoter, in which the alphaFXRE is not conserved, nor a mouse alphaFXRE-driven heterologous reporter, were responsive to CDCA treatment. Moreover, PPARalpha expression was not regulated in taurocholic acid-fed mice. Finally, induction of hPPARalpha mRNA levels by CDCA resulted in an enhanced induction of the expression of the PPARalpha target gene carnitine palmitoyltransferase I by PPARalpha ligands. In concert, these results demonstrate that bile acids stimulate PPARalpha expression in a species-specific manner via a FXRE located within the human PPARalpha promoter. These results provide molecular evidence for a cross-talk between the FXR and PPARalpha pathways in humans.
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MESH Headings
- Animals
- Base Sequence
- Bile Acids and Salts/metabolism
- Bile Acids and Salts/pharmacology
- Cells, Cultured
- Chenodeoxycholic Acid/pharmacology
- DNA-Binding Proteins/agonists
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/metabolism
- Gene Expression Regulation/drug effects
- Hepatocytes/drug effects
- Hepatocytes/physiology
- Humans
- Isoxazoles/pharmacology
- Liver Neoplasms, Experimental/genetics
- Male
- Mice
- Mice, Inbred C57BL
- Molecular Sequence Data
- Promoter Regions, Genetic
- RNA, Messenger/drug effects
- RNA, Messenger/metabolism
- Receptor Cross-Talk
- Receptors, Cytoplasmic and Nuclear/drug effects
- Receptors, Cytoplasmic and Nuclear/genetics
- Receptors, Cytoplasmic and Nuclear/metabolism
- Receptors, Retinoic Acid/drug effects
- Receptors, Retinoic Acid/genetics
- Receptors, Retinoic Acid/metabolism
- Response Elements/drug effects
- Response Elements/genetics
- Retinoid X Receptors
- Species Specificity
- Taurocholic Acid/pharmacology
- Transcription Factors/agonists
- Transcription Factors/drug effects
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Tumor Cells, Cultured
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Affiliation(s)
- Inés Pineda Torra
- U.545 Institut National de la Santé et de la Recherche Médicale, Département d'Athérosclérose, Institut Pasteur de Lille, 59019 Lille, France
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