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Mosbah H, Donadille B, Vatier C, Janmaat S, Atlan M, Badens C, Barat P, Béliard S, Beltrand J, Ben Yaou R, Bismuth E, Boccara F, Cariou B, Chaouat M, Charriot G, Christin-Maitre S, De Kerdanet M, Delemer B, Disse E, Dubois N, Eymard B, Fève B, Lascols O, Mathurin P, Nobécourt E, Poujol-Robert A, Prevost G, Richard P, Sellam J, Tauveron I, Treboz D, Vergès B, Vermot-Desroches V, Wahbi K, Jéru I, Vantyghem MC, Vigouroux C. Dunnigan lipodystrophy syndrome: French National Diagnosis and Care Protocol (PNDS; Protocole National de Diagnostic et de Soins). Orphanet J Rare Dis 2022; 17:170. [PMID: 35440056 PMCID: PMC9019936 DOI: 10.1186/s13023-022-02308-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 03/24/2022] [Indexed: 11/29/2022] Open
Abstract
Dunnigan syndrome, or Familial Partial Lipodystrophy type 2 (FPLD2; ORPHA 2348), is a rare autosomal dominant disorder due to pathogenic variants of the LMNA gene. The objective of the French National Diagnosis and Care Protocol (PNDS; Protocole National de Diagnostic et de Soins), is to provide health professionals with a guide to optimal management and care of patients with FPLD2, based on a critical literature review and multidisciplinary expert consensus. The PNDS, written by members of the French National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), is available on the French Health Authority website (in French). Dunnigan syndrome is characterized by a partial atrophy of the subcutaneous adipose tissue and by an insulin resistance syndrome, associated with a risk of metabolic, cardiovascular and muscular complications. Its prevalence, assessed at 1/100.000 in Europe, is probably considerably underestimated. Thorough clinical examination is key to diagnosis. Biochemical testing frequently shows hyperinsulinemia, abnormal glucose tolerance and hypertriglyceridemia. Elevated hepatic transaminases (hepatic steatosis) and creatine phosphokinase, and hyperandrogenism in women, are common. Molecular analysis of the LMNA gene confirms diagnosis and allows for family investigations. Regular screening and multidisciplinary monitoring of the associated complications are necessary. Diabetes frequently develops from puberty onwards. Hypertriglyceridemia may lead to acute pancreatitis. Early atherosclerosis and cardiomyopathy should be monitored. In women, polycystic ovary syndrome is common. Overall, the management of patients with Dunnigan syndrome requires the collaboration of several health care providers. The attending physician, in conjunction with the national care network, will ensure that the patient receives optimal care through regular follow-up and screening. The various elements of this PNDS are described to provide such a support.
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Affiliation(s)
- H Mosbah
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - B Donadille
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France
| | - C Vatier
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - S Janmaat
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - M Atlan
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Plastic Surgery Department, Assistance Publique-Hôpitaux de Paris, Tenon Hospital, Paris, France
| | - C Badens
- Department of Genetics, Assistance Publique-Hôpitaux de Marseille, Marseille, France
| | - P Barat
- Pediatric Endocrinology Unit, Bordeaux University Hospitals, Bordeaux, France
| | - S Béliard
- Nutrition Department, Assistance Publique-Hôpitaux de Marseille, La Conception Hospital, Marseille, France
| | - J Beltrand
- Paediatric Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Necker Hospital, Paris University, Paris, France
| | - R Ben Yaou
- Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Myology Institute, Sorbonne University, Paris, France
| | - E Bismuth
- Paediatric Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Robert Debré Hospital, Paris University, Paris, France
| | - F Boccara
- Cardiology Department, Assistance Publique-Hôpitaux de Paris, St Antoine Hospital, Sorbonne University, Paris, France
| | - B Cariou
- Endocrinology Department, Nantes University Hospitals, Guillaume et René Laennec Hospital, Nantes University, Nantes, France
| | - M Chaouat
- Plastic Surgery Department, Assistance Publique-Hôpitaux de Paris, St Louis Hospital, Paris University, Paris, France
| | - G Charriot
- French Lipodystrophy Association (AFLIP; Association Française des Lipodystrophies), Pierrevert, France
| | - S Christin-Maitre
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Sorbonne University, Inserm UMR_S933, Paris, France
| | - M De Kerdanet
- Paediatric Endocrinology Department, Rennes University Hospitals, South Hospital, Rennes, France
| | - B Delemer
- Endocrinology Department, Reims University Hospitals, Robert Debré Hospital, Reims, France
| | - E Disse
- Endocrinology Department, Lyon University Hospitals, South Lyon Civil Hospital, Lyon University, Pierre Benite, France
| | - N Dubois
- Nutrition Department, Assistance Publique-Hôpitaux de Marseille, La Conception Hospital, Marseille, France
| | - B Eymard
- Assistance Publique-Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Myology Institute, Sorbonne University, Paris, France
| | - B Fève
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France.,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France
| | - O Lascols
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Molecular Biology and Genetics Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
| | - P Mathurin
- Hepatology Department, Lille 2 University Hospitals, Lille University, Lille, France
| | - E Nobécourt
- Endocrinology Department, La Reunion University Hospitals, Reunion South Hospital, St Pierre de la Reunion, France
| | - A Poujol-Robert
- Hepatology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine Hospital, Sorbonne University, Paris, France
| | - G Prevost
- Endocrinology Department, Rouen University Hospitals, Bois-Guillaume Hospital, Rouen, France
| | - P Richard
- Cardiogenetics and Myogenetics Department, Assistance Publique-Hôpitaux de Paris, Pitie Salpêtrière Hospital, Sorbonne University, Paris, France
| | - J Sellam
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Rhumatology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine Hospital, Sorbonne University, Paris, France
| | - I Tauveron
- Endocrinology Department, Clermont-Ferrand University Hospital, Clermont Auvergne University, Clermont-Ferrand, France
| | - D Treboz
- French Lipodystrophy Association (AFLIP; Association Française des Lipodystrophies), Pierrevert, France
| | - B Vergès
- Endocrinology-Diabetology Department, Dijon University Hospital, François Mitterand Hospital, Bourgogne University, Dijon, France
| | - V Vermot-Desroches
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France
| | - K Wahbi
- Cardiology Department, Assistance Publique-Hôpitaux de Paris, Cochin Hospital, Paris University, Paris, France
| | - I Jéru
- Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France.,Molecular Biology and Genetics Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France
| | - M C Vantyghem
- Endocrinology Department, Lille 2 University Hospitals, Lille University, Lille, France
| | - C Vigouroux
- Endocrinology, Diabetology and Reproductive Endocrinology Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, National Reference Center for Rare Diseases of Insulin Secretion and Insulin Sensitivity (PRISIS), Paris, France. .,Sorbonne University, Inserm UMR_S938, Saint-Antoine Research Centre, Institute of Cardiometabolism and Nutrition, Paris, France. .,Molecular Biology and Genetics Department, Assistance Publique-Hôpitaux de Paris, Saint-Antoine University Hospital, Paris, France.
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Larbret F, Biber P, Dubois N, Ivanov S, Lafanechere L, Tartare-Deckert S, Deckert M. Deubiquitinase Inhibitors Impair Leukemic Cell Migration Through Cofilin Oxidation and Alteration of Actin Reorganization. Front Pharmacol 2022; 12:778216. [PMID: 35069199 PMCID: PMC8782157 DOI: 10.3389/fphar.2021.778216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 12/14/2021] [Indexed: 11/29/2022] Open
Abstract
Actin networks are dynamically regulated through constant depolymerization and polymerization cycles. Although the fundamental mechanisms that govern these processes have been identified, the nature and role of post-translational modifications (PTMs) of actin and actin regulatory proteins are not completely understood. Here, we employed Actin CytoFRET, a method that we developed for real time detection of fluorescence resonance energy transfer (FRET) signals generated by actin dynamics, to screen a small library of PTM-interfering compounds on a biosensor leukemic T cell line. This strategy led to the identification of small molecule inhibitors of deubiquitinating enzymes (DUBs) as potent inducers of actin polymerization and blockers of chemotactic cell migration. The examination of the underlying mechanism further revealed that the actin depolymerizing protein cofilin represents a major effector of DUB inhibitor (DUBi)-induced actin reorganization. We found that DUB blockade results in the accumulation of polyubiquitinated proteins and ROS production, associated with cofilin oxidation and dephosphorylation on serine 3, which provokes uncontrolled actin polymerization impairing cell migration. Together, our study highlights DUBs as novel regulators of actin dynamics through ROS-dependent cofilin modulation, and shows that DUBi represent attractive novel tools to impede leukemic cell migration.
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Affiliation(s)
- Frédéric Larbret
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Team MicroCan, Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Pierric Biber
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Team MicroCan, Equipe labellisée Ligue Contre le Cancer, Nice, France
| | | | | | - Laurence Lafanechere
- Université Grenoble Alpes, INSERM, Institut pour l'Avancée des Biosciences, La Tronche, France
| | - Sophie Tartare-Deckert
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Team MicroCan, Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Marcel Deckert
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Team MicroCan, Equipe labellisée Ligue Contre le Cancer, Nice, France
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Dolley-Hitze T, Mary E, Dubois N. Validation volumétrique et biologique d’un nouvel échantillonneur de dialysat. Nephrol Ther 2018. [DOI: 10.1016/j.nephro.2018.07.070] [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: 10/28/2022]
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Dolley-Hitze T, Duquennoy S, Laruelle E, Renaudineau E, Dubois N, Bahon-Riedinger I. Utilisation d’une nouvelle triacétate de cellulose en HDF post-dilution comme alternative dans les allergies aux polysulfones. Nephrol Ther 2018. [DOI: 10.1016/j.nephro.2018.07.112] [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: 11/12/2022]
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5
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Meune C, Sorbets E, Garnier N, Dubois N, Betraoui A, Bonnivard V, Schwoerer M, Szostek A, Ganninger M, Goudot FX. P6460Integration of high-sensitivity cardiac troponin and practical consequences in real world: results of big data analysis. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p6460] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- C Meune
- Hospital Avicenne of Bobigny, Cardiology, Bobigny, France
| | - E Sorbets
- Hospital Avicenne of Bobigny, Cardiology, Bobigny, France
| | - N Garnier
- ProbaYes, Statitistics, Montbonnot, France
| | - N Dubois
- Clinique de la côte d'émeraude, Biorance Laboratory, Saint-Malo, France
| | - A Betraoui
- ProbaYes, Statitistics, Montbonnot, France
| | | | | | - A Szostek
- ProbaYes, Statitistics, Montbonnot, France
| | - M Ganninger
- Roche Diagnostics Information Solutions, Basel, Switzerland
| | - F X Goudot
- Hospital Avicenne of Bobigny, Cardiology, Bobigny, France
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6
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Licour C, Tondeur F, Gerardy I, Alaoui NM, Dubois N, Perreaux R, Gerardy N, Christiaens D. 226Ra, 222Rn AND PERMEABILITY OF BELGIAN SOILS IN RELATION WITH INDOOR RADON RISK. Radiat Prot Dosimetry 2017; 177:168-172. [PMID: 29036340 DOI: 10.1093/rpd/ncx163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Knowing the concentration of 226Ra in soil and of 222Rn in soil gas is important for the analysis of indoor radon data and the prediction of radon-prone areas. Except for soil Rn in Ardenne, the data concerning these two radionuclides in Belgian soils are very scarce. In the context of Master theses and international courses, students made 92 measurements of 226Ra in soil samples, 105 of 222Rn in soil gas, and 74 of soil permeability, a significant addition to the existing similar data. The data are analysed in relation with soil texture, geological units and indoor radon risk. There is no clear correlation between radium in soil and indoor radon risk, the most important factor of risk being soil permeability.
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Affiliation(s)
- C Licour
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
| | - F Tondeur
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
| | - I Gerardy
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
| | - N Medaghri Alaoui
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
| | - N Dubois
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
| | - R Perreaux
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
| | - N Gerardy
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
| | - D Christiaens
- ISIB, Haute Ecole de Bruxelles-Brabant, rue Royale 150, Brussels 1000, Belgium
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7
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Meune C, Goudot F, Garnier N, Dubois N, Copin G, Charnaux N, Szostek A, Bonnivard V, Gobeaux C, Sorbets E. P4898Current use and misuse of natriuretic peptides form a large cohort: results of big data analysis. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p4898] [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: 11/13/2022] Open
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8
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Meune C, Goudot F, Garnier N, Dubois N, Copin G, Charnaux N, Schwoerer M, Bonnivard V, Gobeaux C, Sorbets E. P4895Current use and misuse of troponin measurements form a large cohort: results of big data analysis. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p4895] [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: 11/12/2022] Open
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9
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Donnet JB, Zbinden H, Benoit H, Daune M, Dubois N, Pouyet J, Scheibling G, Vallet G. Mesures hydrodynamiques et optiques sur un sol de V2O5 (1). ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1950470052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Tsakadze E, Bindslev H, Korsholm SB, Larsen AW, Meo F, Michelsen PK, Michelsen S, Nielsen AH, Nimb S, Lauritzen B, Nonbøl E, Dubois N. Fast Ion Collective Thomson Scattering Diagnostic for ITER: Design Elements. Fusion Science and Technology 2017. [DOI: 10.13182/fst08-a1654] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- E. Tsakadze
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - H. Bindslev
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - S. B. Korsholm
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark and Massachusetts Institute of Technology Plasma Science and Fusion Center Cambridge, Massachusetts 02139
| | - A. W. Larsen
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - F. Meo
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - P. K. Michelsen
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - S. Michelsen
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - A. H. Nielsen
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - S. Nimb
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - B. Lauritzen
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - E. Nonbøl
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - N. Dubois
- Association Euratom/Risø National Laboratory Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
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Dubois N, Willems M, Kroonen J, Berendsen S, Van Hecke W, Bredel M, Musumeci L, Poulet C, Chakravarti A, Bours V, Robe P. Involvement of Iκbζ in glioblastomas and its potential implication in radioresistance. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)32644-2] [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: 10/20/2022]
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12
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Gaudy-Marqueste C, Clevy C, Dubois N, Monestier S, Préau Y, Mallet S, Richard MA, Valéro R, Grob JJ, Béliard S. Survenue d’un diabète fulminant sous pembrolizumab. Ann Dermatol Venereol 2015. [DOI: 10.1016/j.annder.2015.10.484] [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: 11/28/2022]
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13
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Prod'Homme V, Boyer L, Dubois N, Mallavialle A, Munro P, Mouska X, Coste I, Rottapel R, Tartare-Deckert S, Deckert M. Cherubism allele heterozygosity amplifies microbe-induced inflammatory responses in murine macrophages. J Clin Invest 2015; 125:1396-400. [PMID: 25705883 DOI: 10.1172/jci71081] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 01/08/2015] [Indexed: 11/17/2022] Open
Abstract
Cherubism is a rare autoinflammatory bone disorder that is associated with point mutations in the SH3-domain binding protein 2 (SH3BP2) gene, which encodes the adapter protein 3BP2. Individuals with cherubism present with symmetrical fibro-osseous lesions of the jaw, which are attributed to exacerbated osteoclast activation and defective osteoblast differentiation. Although it is a dominant trait in humans, cherubism appears to be recessively transmitted in mice, suggesting the existence of additional factors in the pathogenesis of cherubism. Here, we report that macrophages from 3BP2-deficient mice exhibited dramatically reduced inflammatory responses to microbial challenge and reduced phagocytosis. 3BP2 was necessary for LPS-induced activation of signaling pathways involved in macrophage function, including SRC, VAV1, p38MAPK, IKKα/β, RAC, and actin polymerization pathways. Conversely, we demonstrated that the presence of a single Sh3bp2 cherubic allele and pathogen-associated molecular pattern (PAMP) stimulation had a strong cooperative effect on macrophage activation and inflammatory responses in mice. Together, the results from our study in murine genetic models support the notion that infection may represent a driver event in the etiology of cherubism in humans and suggest limiting inflammation in affected individuals may reduce manifestation of cherubic lesions.
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14
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Willems M, Kroonen J, Dubois N, Berendsen S, Nguyen B, Bredel M, Artesi M, Kim H, Rados M, Chakravarti A, Bours V, Robe P. CS-36 * IkappaB ZETA OVEREXPRESSION DRIVES HUMAN GLIOMA RESISTANCE TO NECROPTOSIS. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou242.36] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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15
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Schmitt F, Bouhours-Nouet N, Beaumesnil M, Dubois N, Coutant R, Topart P, Weil D, Podevin G. SFP PC-16 - Impact de l’anneau gastrique ajustable chez l’adolescent obèse. Arch Pediatr 2014. [DOI: 10.1016/s0929-693x(14)72166-9] [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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16
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Dubois N, Elbaz A, Charlier C. QUANTITATIVE DETERMINATION OF EIGHT ORGANOCHLORINE PESTICIDES IN SERUM BY GC COUPLED TO TANDEM MASS SPECTROMETRY. Acta Clin Belg 2014. [DOI: 10.1179/acb.2010.110] [Citation(s) in RCA: 4] [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: 10/31/2022]
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17
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Hubert P, Rozet E, Boulanger B, Dewé W, Laurentie M, Dubois N, Charlier C, Feinberg M. HARMONISATION DES STRATÉGIES DE VALIDATION ET ESTIMATION DE L’INCERTITUDE ASSOCIÉE DANS LE CADRE DE L’ACCRÉDITATION DES LABORATOIRES D’ESSAIS. Acta Clin Belg 2014. [DOI: 10.1179/acb.2006.071] [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: 10/31/2022]
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18
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Dubois N, Debrus B, Hubert P, Charlier C. VALIDATED QUANTITATIVE SIMULTANEOUS DETERMINATION OF COCAINE, OPIATES AND AMPHETAMINES IN SERUM BY U-HPLC COUPLED TO TANDEM MASS SPECTROMETRY. Acta Clin Belg 2014. [DOI: 10.1179/acb.2010.113] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Mistretta V, Dubois N, Denooz R, Charlier C. Simultaneous determination of seven azole antifungal drugs in serum by ultra-high pressure liquid chromatography and diode array detection. Acta Clin Belg 2014; 69:53-61. [PMID: 24635400 DOI: 10.1179/0001551213z.00000000018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Azole antifungals are a group of fungistatic agents that can be administered orally or parenterally. The determination of the concentrations of these antifungals (miconazole, fluconazole, ketoconazole, posaconazole, voriconazole, itraconazole, and its major active metabolite, hydroxy-itraconazole) in serum can be useful to adapt the doses to pharmacological ranges because of large variability in the absorption and metabolism of the drugs, multiple drug interactions, but also potential resistance or toxicity. A method was developed and validated for the simultaneous determination of these drugs in serum utilizing ultra-high pressure liquid chromatography and diode array detection (UHPLC-DAD). After a simple and rapid liquid-liquid extraction, the pre-treated sample was analysed on an UHPLC-DAD system (Waters Corporation(®)). The chromatographic separation was carried out on an Acquity BEH C18 column (Waters Corporation) with a gradient mode of mobile phase composed of acetonitrile and aqueous ammonium bicarbonate 10·0 M pH10. The flow rate was 0·4 ml/min and the injection volume was 5 μl. The identification wavelength varied according to the drug from 210 to 260 nm. The method was validated by the total error method approach by using an analytical validation software (e•noval V3·0 Arlenda(®)). The seven azole antifungals were identified by retention time and specific UV spectra, over a 13-minute run time. All calibration curves showed good linearity (r(2)>0·99) in ranges considered clinically adequate. The assay was linear from 0·05 to 10 mg/l for voriconazole, posaconazole, itraconazole, hydroxy-itraconazole, and ketoconazole, from 0·3 to 10 mg/l for fluconazole, and from 0·1 to 10 mg/l for miconazole. The bias and imprecision values for intra- and inter-assays were lower than 10% and than 15%, respectively. In conclusion, a simple, sensitive, and selective UHPLC-DAD method was developed and validated to determine seven azole antifungal drugs in human serum. This method is applicable to patient samples, and can be applied successfully to clinical applications and therapeutic drug monitoring.
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Cameron M, Leclerc S, Beauséjour C, Antin P, Dubois N, Chemtob S, Andelfinger G. SNX30 Negatively Regulates WNT/β-Catenin Signaling by Altering Cell Surface Expression of FZ Receptors. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.096] [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: 11/29/2022] Open
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Dubois N, Demaret I, Ansseau M, Rozet E, Hubert P, Charlier C. Plasma level monitoring of the major metabolites of diacetylmorphine (heroin) by the "chasing the dragon" route in severe heroin addicts. Acta Clin Belg 2013; 68:359-67. [PMID: 24579243 DOI: 10.2143/acb.3323] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The objective of the present study was to verify if severe physical health problems frequently encountered in heroin addicts and the concomitant use of alcohol and legal or illegal drugs other than heroin influenced the pharmacokinetics of the major metabolites of heroin. We conducted a 90 minutes follow-up of the plasma concentrations of the pharmaceutical heroin, named diacetylmorphine (DAM), in patients recruited in a DAM assisted treatment centre. TADAM (Traitement Assisté par DiAcétylMorphine) aimed to compare the efficacy of heroin-assisted treatment (HAT) compared with methadone maintenance treatment (MMT) for heroin users considered as treatment resistant patients and who have severe physical and mental health problems. Eleven patients were recruited. Blood samples were collected at baseline and 15, 45 and 90 minutes after DAM administration. All patients received DAM by the "chasing the dragon" route. Plasma samples were analyzed by a previously described ultra-high pressure liquid chromatography coupled to tandem mass spectrometry (UHPLC/MS-MS) method. A principal component analysis (PCA) was performed and 8 metabolite concentrations ratios were calculated to evaluate the influence of various factors (DAM dose, patient pathologies, concomitant use of medications, methadone, street heroin, alcohol and cocaine) on heroin metabolite pharmacokinetics. It seemed to be not affected by the DAM dose, patient pathologies and the concomitant use of medications, methadone, street heroin and alcohol. Cocaine use was the only parameter which showed differences in heroin pharmacokinetics.
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Affiliation(s)
- N Dubois
- Laboratory of Clinical, Forensic, Environmental and Industrial Toxicology, CHU, Liège.
| | - I Demaret
- Department of Psychiatry, CHU, Liège
| | - M Ansseau
- Department of Psychiatry, CHU, Liège
| | - E Rozet
- Laboratory of Analytical Chemistry, Department of Pharmacy, University of Liège
| | - Ph Hubert
- Laboratory of Analytical Chemistry, Department of Pharmacy, University of Liège
| | - C Charlier
- Laboratory of Clinical, Forensic, Environmental and Industrial Toxicology, CHU, Liège
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Larbret F, Dubois N, Brau F, Guillemot E, Mahiddine K, Tartare-Deckert S, Verhasselt V, Deckert M. Technical advance: actin CytoFRET, a novel FRET flow cytometry method for detection of actin dynamics in resting and activated T cell. J Leukoc Biol 2013; 94:531-9. [PMID: 23794712 DOI: 10.1189/jlb.0113022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Actin cytoskeleton plays a critical role in regulating T cell motility and activation. However, the lack of a real-time quantitative method to analyze actin assembly has limited the progress toward understanding actin regulation. Here, we describe a novel approach to probe actin dynamics on living T cells using FRET combined with flow cytometry. We have first generated a Jurkat T cell line stably coexpressing EGFP and mOrange FPs fused to actin. The real-time variation of actin monomer assembly or disassembly into filaments was quantified using a ratiometric flow cytometry method measuring changes in the mOrange/EGFP emission ratio. The method was validated on resting T cells by using chemical compounds with known effects on actin filaments and comparison with conventional microscopy imaging. Our method also detected the rapid and transient actin assembly in T cells stimulated by anti-CD3/CD28-coated beads, demonstrating its robustness and high sensitivity. Finally, we provide evidence that lentiviral-mediated transduction of shRNAs in engineered Jurkat cells could be used as a strategy to identify regulators of actin remodeling. In conclusion, the flow cytometric FRET analysis of actin polymerization represents a new technical advance to study the dynamics of actin regulation in intact cells.
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Affiliation(s)
- Frédéric Larbret
- Tolérance Immunitaire, Université de Nice Sophia-Antipolis, Nice, France
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Maheux-Lacroix S, Tremblay M, Dubois N, de Gasquet B, Turcotte S, Girard N, Bourdages M, Houde M, Dodin S. O422 ALTERNATIVE BIRTHING POSITIONS: A RETROSPECTIVE STUDY OF OBSTETRIC OUTCOMES COMPARED TO THE TRADITIONAL SUPINE POSITION. Int J Gynaecol Obstet 2012. [DOI: 10.1016/s0020-7292(12)60852-2] [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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Cameron M, Leclerc S, Dubois N, Chemtob S, Andelfinger G. 350 Sorting Nexin-30: A New Negative Regulator of Wnt/β-Catenin Signaling Identified in the Frog With Implications in Cardiogenesis. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Dubois N, Paccou A, De Backer B, Charlier C. Validation of the Quantitative Determination of Tetrahydrocannabinol and Its Two Major Metabolites in Plasma by Ultra-High-Performance Liquid Chromatography–Tandem Mass Spectrometry According to the Total Error Approach*. J Anal Toxicol 2012; 36:25-9. [DOI: 10.1093/jat/bkr009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Sharma P, Bousette N, Ignatchenko A, Noronha M, Ignatchenko V, Dubois N, Miyake T, Liu J, Hamilton R, Backx P, Keller G, Kislinger T, Gramolini A. 280 Proteomic profiling of mouse and human cardiac membrane proteins reveals novel cardiac proteins. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.208] [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: 10/16/2022] Open
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Dubois N. Theory of the social value of persons applied to organizations: Typologies of “good” leaders and recruitment. European Review of Applied Psychology 2010. [DOI: 10.1016/j.erap.2010.01.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Castinetti F, Morange I, Dubois N, Albarel F, Conte-Devolx B, Dufour H, Brue T. Does first-line surgery still have its place in the treatment of acromegaly? Ann Endocrinol (Paris) 2009; 70:107-12. [PMID: 19345337 DOI: 10.1016/j.ando.2009.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Indexed: 11/28/2022]
Abstract
Transsphenoidal surgery is currently the first-line treatment of acromegaly. Remission is observed in 80 to 90% microadenomas, 50 to 60% non-invasive macroadenomas, and less than 20% invasive macroadenomas. Predictive factors include age, maximal size of the adenoma, cavernous sinus invasion, initial hormone levels and neurosurgeon's experience. Complications are rare, with about 5% definitive diabetes insipidus and 10% of new anterior pituitary hormone deficits. Somatostatin agonist pretreatment can be proposed as it decreases tumor volume in about 25% cases and might reduce the rate of immediate postsurgical complications; however, there is no obvious difference in surgical remission rate whether patients are pretreated or not. Debulking surgery can also be proposed in very large macroadenomas incompletely controlled by somatostatin agonists or resistant to medical treatment, as it was shown to facilitate somatostatin agonist efficacy in more than 50% cases.
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Affiliation(s)
- F Castinetti
- Service d'endocrinologie, diabète et maladies métaboliques, centre de référence des maladies rares d'origine hypophysaire, hôpital de la Timone, Assistance publique-Hôpitaux de Marseille, université de la méditerranée, Marseille, France.
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Dubois N, Willems T, Myant N. [Ovarian metastasis of breast cancer: a case report. Role of cytoreductive surgery]. ACTA ACUST UNITED AC 2009; 38:242-5. [PMID: 19304411 DOI: 10.1016/j.jgyn.2009.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2008] [Revised: 01/31/2009] [Accepted: 02/09/2009] [Indexed: 10/21/2022]
Abstract
The ovaries are a common metastatic site for breast cancer. The diagnosis and treatment of ovarian masses from a metastatic breast cancer are difficult. The complete resection of these metastatic masses seems to give a benefit in terms of global survival. This benefit depends on the residual tumoral volume and on the free interval between initial breast cancer diagnosis and apparition of the metastatic ovarian masses. We discuss the treatment of a patient with ovarian metastasis as first sign of a metastatic breast cancer.
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Affiliation(s)
- N Dubois
- Service de gynécologie, site hôpital Sainte-Thérèse, grand hôpital de Charleroi ASBL, 6061 Montignies-sur-Sambre, Belgique.
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Coze S, Benyamine A, Serratrice J, Chlavignac V, Bernard F, Amri AB, Dubois N, Gariboldi V, Guidon C, Devolx BC, Weiller P. Un syndrome redoutable : l’insuffisance cardiaque gravissime de l’insuffisance surrénale aiguë. Rev Med Interne 2008. [DOI: 10.1016/j.revmed.2008.03.036] [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: 12/01/2022]
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Dubois N, de Muylder X, Foading B. Infarctus myocardique durant la grossesse: à propos d'un cas traité par angioplastie transluminale percutanée et implantation d'un stent coronarien. ACTA ACUST UNITED AC 2007; 35:654-7. [PMID: 17567523 DOI: 10.1016/j.gyobfe.2006.12.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2006] [Accepted: 12/18/2006] [Indexed: 11/20/2022]
Abstract
Acute myocardial infarction is an un-frequent event during pregnancy. It clearly causes an increase in both maternal and fetal mortality. We describe a case of pregnancy complicated during the second trimester by an acute myocardial infarction witch was treated by percutaneous transluminal coronary angioplasty combined with stenting. The challenge involved in managing this condition during pregnancy is briefly discussed.
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Affiliation(s)
- N Dubois
- Service de Gynécologie-Obstétrique, Clinique Générale Saint-Jean, 32 Boulevard Botanique, 1000 Bruxelles, Belgique.
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Hubert P, Rozet E, Boulanger B, Dewé W, Laurentie M, Dubois N, Charlier C, Feinberg M. [Harmonisation of validation strategies and estimation of the associated uncertainty in the framework of assay laboratoires accreditation]. Acta Clin Belg 2006; 61 Suppl 1:54-6. [PMID: 16700153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
In order to achieve the harmonization of validation strategies, the interpretation of several validation criteria is proposed. Furthermore, a simple and visual decision tool to assess the validity of an analytical procedure is described: the accuracy profile based on the estimation of the total error of the measurements. This profile build with beta-expectation tolerance intervals can also compute with efficiency the uncertainty related to the results of a laboratory, which is an essential parameter for the accreditation of laboratories under ISO 17025.
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Affiliation(s)
- P Hubert
- Laboratoire de Chimie Analytique, Institut de Pharmacie, Université de Liege, Avenue de l'Hôpital, 1 Bat. B36, 4000 Liège, Belgique.
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Denooz R, Dubois N, Charlier C. [Analysis of two year heroin seizures in the Liege area]. Rev Med Liege 2005; 60:724-8. [PMID: 16265967] [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: 05/05/2023]
Abstract
The results of heroin analysis from seizures in the Liege area during the last two years are presented in this article. Between January 2003 and January 2005, 50 samples were analysed in the Laboratory of Clinical Toxicology and Forensic Toxicology of the University of Liege. Mean heroin concentration was 14,7%. Noscapine and papaverine, other opium alcaloïds, were simultaneously present with heroin. As diluents, we only identified caffein and acetaminophen.
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Affiliation(s)
- R Denooz
- Service de Toxicologie clinique et Médico-légale, CHU du Sart-Tilman, Liège.
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Abstract
This paper presents a case of fatal overdosage due to an accidental massive administration (750 mg instead of 170 mg) of cisplatin, an anticancer agent, to a 63-year-old patient suffering from lymphoma. Platinum was measured in various postmortem samples by means of inductively coupled plasma mass spectrometry. Heart and peripheral blood concentrations of platinum were 1515 and 1253 micro g/L, respectively. Concentrations in urine and bile were 1038 and 501 micro g/L, respectively. Renal dialysis was started immediately after the end of cisplatin perfusion, when the mistake was noticed, but the patient deceased at day 16, presenting renal and hepatic insufficiency, ototoxicity, and pancytopenia.
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Affiliation(s)
- C Charlier
- Laboratory of Clinical Toxicology, University Hospital, Liege, Belgium.
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Chandelier A, Dubois N, Baelen F, De Leener F, Warnon S, Remacle J, Lepoivre P. RT-PCR-ELOSA tests on pooled sample units for the detection of virus Y in potato tubers. J Virol Methods 2001; 91:99-108. [PMID: 11164491 DOI: 10.1016/s0166-0934(00)00238-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A highly sensitive RT-PCR protocol able to detect potato virus Y (PVY) in pooled sample units (tubers) was developed. PVY-specific primers selected in the coat protein gene were found to amplify a 359 bp fragment from diluted crude extract of infected tubers. For the detection of the amplification products, a colorimetric detection procedure in microtiter plates was established. The amplicons are hybridized between a covalently linked capture probe and a specific biotinylated detection probe ELOSA tests. This detection method detects at least 50 pg of virus per reaction for the four cultivars tested. The RT-PCR-ELOSA assay was adapted to pooled units in order to increase the sample size while reducing the number of tests.
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Affiliation(s)
- A Chandelier
- Faculté Universitaire des Sciences Agronomiques de Gembloux, Unité de Phytopathologie, Passage des Déportés, 2 B-5030 Gembloux, Belgium
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Herrmann JL, Dubois N, Fourgeaud M, Basset D, Lagrange PH. Synergic inhibitory activity of amphotericin-B and gamma interferon against intracellular Cryptococcus neoformans in murine macrophages. J Antimicrob Chemother 1994; 34:1051-8. [PMID: 7730221 DOI: 10.1093/jac/34.6.1051] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Cryptococcus neoformans is responsible for pulmonary and meningal infections in HIV patients. The lack of effective cellular cooperation caused by the low level of CD4+ cells, and the resistance of C. neoformans to phagocytosis allows growth and persistence of the yeast in the host. We describe here an in-vitro model of intracellular replication of C. neoformans inside J774-A.1 macrophages, and the determination of the intracellular antifungal activity of amphotericin B and fluconazole alone or in association with IFN-gamma. The maximum inhibitory effect was observed with one MIC of amphotericin B and 100 or 1000 IU/mL of IFN-gamma. amphotericin B alone (at 1 x MIC), or either 1 x or 50 x MIC of fluconazole in normal or IFN-gamma activated macrophages, did not eradicate the ingested yeast. A potential underlying mechanism of the synergy of amphotericin B in IFN-gamma primed macrophages was investigated by measurement of nitrite level and by use of the NO synthase competitive inhibitor, NG-monomethyl L-arginine (NMMA). One MIC of amphotericin B was able to activate the synthesis of nitrogen reactive intermediates in IFN gamma-primed macrophages. NMMA treated infected macrophages responded less well to IFN-gamma priming, resulting in a moderate inhibition in subsequent amphotericin B exposure.
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Affiliation(s)
- J L Herrmann
- Laboratoire de Microbiologie, Hopital Hotel Dieu, Paris, France
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Dubois N, Lapicque F, Magdalou J, Abiteboul M, Netter P. Stereoselective binding of the glucuronide of ketoprofen enantiomers to human serum albumin. Biochem Pharmacol 1994; 48:1693-9. [PMID: 7980637 DOI: 10.1016/0006-2952(94)90453-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Since acyl glucuronides are known to undergo deconjugation, especially in the presence of human serum albumin (HSA), only a few reports have described their reversible binding to plasma proteins. The aim of this study was to investigate the reversible binding of R and S ketoprofen glucuronides to HSA by a rapid technique, such as ultraviolet circular dichroism. Binding of R ketoprofen glucuronide only induced an extrinsic Cotton effect at 340 nm. Scatchard plot analysis revealed that R ketoprofen and its glucuronide are bound to one site of albumin with an association constant of 28.1 x 10(4) and 6.1 x 10(4) M-1, respectively. Modification of one tyrosine residue by diisopropylfluorophosphate prevented the access of ligands to sites I and II of albumin, and also fully inhibited the binding of R ketoprofen and that of its conjugate. Displacement experiments with specific probes of albumin binding sites suggested that R ketoprofen and the glucuronide are bound to site II rather than site I. However, R ketoprofen was not displaced by its conjugate. S ketoprofen glucuronide is also bound to HSA, since it decreased the binding of the antipode conjugate. However, the binding of this metabolite to albumin did not induce an extrinsic Cotton effect large enough to determine the binding constants. D-Glucuronic acid did not bind to sites I or II of albumin. This moiety is likely responsible for the lower affinity of HSA for the R ketoprofen glucuronide when compared to that for R ketoprofen, due to the hydrophilicity and/or the bulkiness of this group.
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Affiliation(s)
- N Dubois
- Laboratoire de Pharmacologie, URA CNRS 1288, Faculté de Médecine, Nancy, France
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Guderley H, Lavoie BA, Dubois N. The interaction among age, thermal acclimation and growth rate in determining muscle metabolic capacities and tissue masses in the threespine stickleback, Gasterosteus aculeatus. Fish Physiol Biochem 1994; 13:419-431. [PMID: 24197078 DOI: 10.1007/bf00003421] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/24/1994] [Indexed: 06/02/2023]
Abstract
Thermal acclimation may directly modify muscle metabolic capacities, or may modify them indirectly via effects upon physiological processes such as growth, reproduction or senescence. To evaluate these interacting effects, we examined the influence of thermal acclimation and acclimatization upon muscle metabolic capacities and tissue masses in 1 + stickleback, Gasterosteus aculeatus, in which confounding interactions between temperature and senescense should be absent. Furthermore, we examined the influence of thermal acclimation upon individual growth rate, muscle enzyme levels and tissue masses in 2 + stickleback sampled at the beginning of their final reproductive season. For 1 + stickleback, cold acclimation more than doubles mitochondrial enzyme levels in the axial muscle. Thermal acclimation did not change the condition of 1 + stickleback at feeding levels which could not maintain the condition of 2+ stickleback. Compensatory metabolic responses to temperature were not apparent in field acclimatized 1 + stickleback. The growth rate of 2 + stickleback was markedly affected by temperature: warm-acclimated fish generally lost mass even at very high levels of feeding (up to 78 enchytraid worms per day) while cold-acclimated fish gained mass. This suggests that warm temperatures accelerate the senescence of 2 + stickleback. Generally, muscle enzyme activities increased with growth rate. In axial muscle, the relationships between CS activity and growth rate differed with acclimation temperature. Independent of the influence of growth rate, CS activities were consistently higher in cold- than warm-acclimated 2 + stickleback, suggesting compensatory increases of CS activity with cold acclimation.
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Affiliation(s)
- H Guderley
- Département de Biologie, Université Laval, Québec, P.Q., G1K 7P4
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Chakir S, Maurice MH, Magdalou J, Leroy P, Dubois N, Lapicque F, Abdelhamid Z, Nicolas A. High-performance liquid chromatographic enantioselective assay for the measurement of ketoprofen glucuronidation by liver microsomes. J Chromatogr B Biomed Appl 1994; 654:61-8. [PMID: 8004244 DOI: 10.1016/0378-4347(93)e0450-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A stereoselective high-performance liquid chromatographic (HPLC) method was developed to study the in vitro glucuronidation of ketoprofen enantiomers by liver microsomes. The HPLC system consisted of a Superspher 100 RP 18 end-capped column eluted with a mixture of acetonitrile and 10 mM tetrabutylammonium bromide in 1 mM potassium phosphate adjusted to pH 4.3 (30:70, v/v). Ultraviolet detection was performed at a wavelength of 254 nm. The capacity factors of S-ketoprofen glucuronide, R-ketoprofen glucuronide and R,S-ketoprofen were 12.8, 14.5 and 18.1, respectively. Sample pretreatment consisted of protein precipitation in microsomal incubation suspensions and further purification on a Sep Pak C18 cartridge before injection onto the HPLC system. Quantitation was performed with standard glucuronides biosynthetized with immobilized microsomes and purified by semi-preparative HPLC. The linearity of the method between 1.25 and 25.0 micrograms ml-1 (coefficient of correlation greater than 0.999), the repeatability (coefficient of variation = 1.2%; n = 5), and recovery (within 85%) were tested. The limit of detection was 10 ng for each glucuronide injected. The in vitro glucuronidation of R- and S-ketoprofen was measured in liver microsomes from man and from various animal species (dog, rat, rabbit). For both enantiomers, dog presented the highest specific activity. In contrast, the lowest activity was found in rabbit. On the other hand, the formation ratio of the S- and R-glucuronides of ketoprofen was close to 1 in man, rat and rabbit, but was 4.5 in dog, thus indicating that the reaction was stereoselective in this species.
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Affiliation(s)
- S Chakir
- Laboratorie de Biochimie, Faculté des Sciences, Meknes, Maroc, France
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Lapicque F, Dubois N, Netter P. [Optical isomerism of non-steroidal anti-inflammatory agents: consequences on the risk/benefit ratio]. Rev Rhum Ed Fr 1993; 60:780-4. [PMID: 8054923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Abstract
Stereoselective binding of nonsteroidal anti-inflammatory drugs (NSAIDs) can be studied using various techniques. Thus the results obtained by different investigators may be poorly consistent and even contradictory. NSAIDs are bound stereoselectively to serum albumin to different degrees depending on the drug investigated (ibuprofen, indoprofen, carprofen, etodolac, ketoprofen and flurbiprofen). For other drugs, both enantiomers are bound to a similar extent (pirprofen, fenoprofen). This stereoselectivity could vary with experimental conditions, in particular with protein concentration (ketoprofen, etodolac), leading to individual differences. Finally, the stereoselectivity of protein binding and of pharmacokinetics can be compared: differences in binding between enantiomers can explain their differences in pharmacokinetics, once metabolic properties such as inversion have been taken into account.
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Affiliation(s)
- F Lapicque
- Laboratoire de Pharmacologie, Faculté de Médecine, Vandoeuvre les Nancy, France
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44
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Dubois N, Lapicque F, Maurice MH, Pritchard M, Fournel-Gigleux S, Magdalou J, Abiteboul M, Siest G, Netter P. In vitro irreversible binding of ketoprofen glucuronide to plasma proteins. Drug Metab Dispos 1993; 21:617-23. [PMID: 8104120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Many aryl alkanoic acids are cleared as ester glucuronide excreted in urine. While conjugation with glucuronic acid is generally considered as a detoxication process, this conjugate has been shown over the past decade to be a potentially reactive metabolite, undergoing hydrolysis, intramolecular rearrangement, and irreversible binding to proteins. This study describes the in vitro degradation of biosynthetic ketoprofen glucuronide after incubation with human plasma, human serum albumin solutions at various concentrations (290 and 580 microM), and in protein-free buffer, in physiological conditions (pH = 7.4, 37 degrees C). The protein concentrations chosen correspond to that found in synovial fluid and plasma, respectively. Albumin catalyzed the hydrolysis of the glucuronide, but the extent of the reaction was not dependent on the protein concentration. The irreversible binding of ketoprofen was investigated in identical conditions. Maximal ketoprofen-adduct concentrations were achieved after 3 and 10 hr incubation, and were 6.65, 3.2, and 2.6% of initial ketoprofen in plasma and albumin solutions at 580 and 290 microM, respectively. The difference in binding between plasma and albumin (580 microM) could not be totally attributed to the other major plasma proteins, because no irreversible binding was detected with fibrinogen and gamma globulins, and only 0.14% of ketoprofen was bound to alpha and beta globulins after 3 hr incubation. The covalent interaction with albumin was proportional to conjugate concentration over the range studied (from 5 to 30 micrograms/ml or 11.62 to 69.72 microM).
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Affiliation(s)
- N Dubois
- Laboratoire de Pharmacologie, URA CNRS 1288, Faculté de Médecine de Nancy, France
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45
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Dubois N, Muller N, Lapicque F, Gillet P, Netter P, Royer RJ. [Stereoselective protein binding of non-steroidal anti-inflammatory agents. Pharmacological implications]. Therapie 1993; 48:335-9. [PMID: 8128419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Non steroidal anti-inflammatory drugs (NSAIDs) contain a chiral carbon alpha to carboxyl function. Except for naproxen, chiral NSAIDs are marketed for clinical use as racemate, ie an equimolar mixture of the two enantiomers R(-) and S(+). However, in vitro studies have shown that the anti-inflammatory activity exists almost solely in the S form. The unbound fraction is able to diffuse into tissues and to reach sites of action. It represents also the pharmacological active form. Stereoselective protein binding studies carried out at various concentrations of NSAIDs and albumin are used to evaluate the free fraction of the active enantiomer. Two optical isomers do not interact in the same manner with proteins and this binding stereoselectivity depends on NSAID and experimental conditions. Thus, it seems difficult to predict the in vivo free concentration of each enantiomer and protein binding experiments should be achieved taking into account the physiopathological parameters which influence this biological process. This enantioselectivity is determinant for the pharmacokinetic properties and could be responsible of the parameters variation obtained for each enantiomer. It could explain the variability in response to NSAIDs too. In fact, the anti-inflammatory effect is directly function of the free concentration of the S isomer. To correlate the NSAID dose with its activity, it should be better to determine this free fraction in the site of action, in particular in the synovial fluid. But the clinical response, as for example the antalgic effect, remains very far from the pharmacological activity, ie the cyclooxygenase inhibition.
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Affiliation(s)
- N Dubois
- Laboratoire de Pharmacologie, URA CNRS, Faculté de Médecine, Vandoeuvre-lès-Nancy
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46
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Dubois N, Lapicque F, Abiteboul M, Netter P. Stereoselective protein binding of ketoprofen: effect of albumin concentration and of the biological system. Chirality 1993; 5:126-34. [PMID: 8338722 DOI: 10.1002/chir.530050305] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [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: 01/30/2023]
Abstract
Equilibrium dialysis was used to study in vitro the enantioselective binding of R, S, and racemic ketoprofen at physiological pH and temperature in human serum albumin (HSA) (1, 20, and 40 g/liter) and in plasma. The binding of enantiomers in a racemic mixture was studied to see the effect of each isomer on the other's interaction with the protein. The free fractions were determined by high-performance liquid chromatography. The binding of ketoprofen enantiomers to albumin was enantioselective, depending on both drug and protein concentrations. Enantioselectivity was observed in plasma too but was the opposite of that in HSA at 40 g/liter. The percentage of each isomer unbound was higher in the racemic mixture than with the isomer alone. The displacement of probes specific for HSA sites I and II, studied by spectrofluorimetry, suggests that all three preparations of ketoprofen are bound mainly to site I and secondarily to site II.
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Affiliation(s)
- N Dubois
- Laboratoire de Pharmacologie and URA CNRS 1288, Faculté de Médecine, Vandoeuvre les Nancy, France
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47
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Antoine B, Levrat F, Vallet V, Berbar T, Cartier N, Dubois N, Briand P, Kahn A. Gene expression in hepatocyte-like lines established by targeted carcinogenesis in transgenic mice. Exp Cell Res 1992; 200:175-85. [PMID: 1373387 DOI: 10.1016/s0014-4827(05)80086-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.4] [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: 11/23/2022]
Abstract
New hepatocyte-like cell lines (mhAT) were derived from the liver of a transgenic mouse expressing SV40 early genes under the direction of the liver-specific antithrombin III gene promoter (ATIII-TSV40). Their differentiated phenotypes were improved and stabilized by the use of liver-specific growth media (arginine-free, glucose-free, or low-fructose/glucose-free medium). The best differentiated lines display a very high level of albumin, transferrin, and L-type pyruvate kinase (L-PK) gene expression that is comparable to that observed in the mouse liver. Abundance of the aldolase B and phosphoenolpyruvate carboxykinase (PEPCK) transcripts varied from 5 to 35% of the in vivo concentrations while abundance of the alpha-fetoprotein and phenylalanine hydroxylase transcripts remained very low. Hormonal (cAMP and insulin) and nutritional (glucose) gene controls of PEPCK and L-PK were, at least partially, conserved. mhAT cells are readily transfectable by the calcium phosphate coprecipitation technique and exhibit a liver-specific pattern of expression of exogenous genes. Thus, mhAT cells seem suitable for the analysis of the regulatory regions involved in the tissue-specific transcription of genes. This work demonstrates, therefore, the great efficiency of targeted carcinogenesis in transgenic mice to create new differentiated cell lines. The availability of various lines of liver-specific cells with different phenotypes will constitute useful tools to establish correlations between expression of trans-acting factors and control of the phenotype.
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Affiliation(s)
- B Antoine
- Institut Cochin de Génétique Moléculaire, laboratoire de recherche en génétique et pathologie moléculaires (INSERM U129), Paris, France
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48
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Abstract
Insulin-like growth factor II (IGF-II) mRNA expression is developmentally regulated in liver tissue. We previously observed the reexpression of fetal IGF-II mRNAs in human primary liver cancer and in surrounding cirrhotic tissue. In order to determine the steps of liver cancer progression where the activation of IGF-II fetal mRNAs occurs, we analyzed IGF-II mRNA expression during hepatocarinogenesis in transgenic mice carrying an antithrombin III-SV40 early region hybrid gene. The comparative analysis of mRNAs encoding IGF-II and other differentiation-associated proteins, as well as histological analysis, indicate that the reexpression of fetal IGF-II mRNAs takes place in specific steps of liver cancer progression, both in early pretumorous lesions and in well-differentiated hepatocellular carcinomas.
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Affiliation(s)
- E Cariani
- INSERM U 75, CHU Necker, Paris, France
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49
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Dubois N, Bennoun M, Allemand I, Molina T, Grimber G, Daudet-Monsac M, Abelanet R, Briand P. Time-course development of differentiated hepatocarcinoma and lung metastasis in transgenic mice. J Hepatol 1991; 13:227-39. [PMID: 1660504 DOI: 10.1016/0168-8278(91)90819-w] [Citation(s) in RCA: 70] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A precise targeting of the SV40 T early region expression in the liver of transgenic mice was obtained using 700 bp of the antithrombin III regulatory sequences to control oncogene expression. In the strain expressing the highest level of large T antigen (Tag), the incidence of hepatocarcinoma was 100%. The evolution was reproducible and characterized by a marked cytolysis occurring as early as 4 weeks, when no morphological and histological modifications were visible, a preneoplastic state marked by a progression from hyperplasia to proliferative nodules composed of highly differentiated cells exhibiting a high Tag expression, which elicited tumor formation in nude mice and could proliferate in vitro, and hepatocellular carcinoma associated, in 10% of the cases, with lung metastasis. These transgenic mice constituted a useful model for therapeutic assays and fundamental studies on carcinogenesis.
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Affiliation(s)
- N Dubois
- Institut Cochin de Génétique Moléculaire, Génétique et Pathologie Expérimentale, INSERM 22, Paris, France
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50
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Denis J, Dubois N, Ganansia R, du Puy-Montbrun T, Lemarchand N. Hemorrhoidectomy: Hospital Leopold Bellan procedure. Int Surg 1989; 74:152-3. [PMID: 2606616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The authors describe their hemorrhoidectomy technique, a modification of Milligan-Morgan. It differs by the association of a posterior anoplasty (with internal sphincterotomy in the case of a fissure or sphincter hypertonia) and of a sub-mucocutaneous dissection of the security bridges. They report on their experience with 410 operations carried out during the year 1985. Immediate complications are mainly hemorrhage (2.68%) and urinary problems (9%). Average cicatrization time is about six weeks. At one year, there were no relapses nor fissures. A moderate stenosis was observed in 1.45% of the cases, and a hypocontinence to flatus in 2.3%. Use of a CO2 laser does not result in any modification of these results.
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Affiliation(s)
- J Denis
- Colo-Proctology Department, Hôpital L. Bellan, Paris, France
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