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Bőthe B, Koós M, Nagy L, Kraus SW, Demetrovics Z, Potenza MN, Michaud A, Ballester-Arnal R, Batthyány D, Bergeron S, Billieux J, Briken P, Burkauskas J, Cárdenas-López G, Carvalho J, Castro-Calvo J, Chen L, Ciocca G, Corazza O, Csako R, Fernandez DP, Fernandez EF, Fournier L, Fujiwara H, Fuss J, Gabrhelík R, Gewirtz-Meydan A, Gjoneska B, Gola M, Grubbs JB, Hashim HT, Islam MS, Ismail M, Jiménez-Martínez MC, Jurin T, Kalina O, Klein V, Költő A, Lee CT, Lee SK, Lewczuk K, Lin CY, Lochner C, López-Alvarado S, Lukavská K, Mayta-Tristán P, Milea I, Miller DJ, Orosová O, Orosz G, Ponce FP, Quintana GR, Quintero Garzola GC, Ramos-Diaz J, Rigaud K, Rousseau A, De Tubino Scanavino M, Schulmeyer MK, Sharan P, Shibata M, Shoib S, Sigre Leirós VL, Sniewski L, Spasovski O, Steibliene V, Stein DJ, Strizek J, Štulhofer A, Ünsal BC, Vaillancourt-Morel MP. Compulsive sexual behavior disorder in 42 countries: Insights from the International Sex Survey and introduction of standardized assessment tools. J Behav Addict 2023; 12:393-407. [PMID: 37352095 PMCID: PMC10316175 DOI: 10.1556/2006.2023.00028] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 05/23/2023] [Accepted: 05/27/2023] [Indexed: 06/25/2023] Open
Abstract
Background and aims Despite its inclusion in the 11th revision of the International Classification of Diseases, there is a virtual paucity of high-quality scientific evidence about compulsive sexual behavior disorder (CSBD), especially in underrepresented and underserved populations. Therefore, we comprehensively examined CSBD across 42 countries, genders, and sexual orientations, and validated the original (CSBD-19) and short (CSBD-7) versions of the Compulsive Sexual Behavior Disorder Scale to provide standardized, state-of-the-art screening tools for research and clinical practice. Method Using data from the International Sex Survey (N = 82,243; Mage = 32.39 years, SD = 12.52), we evaluated the psychometric properties of the CSBD-19 and CSBD-7 and compared CSBD across 42 countries, three genders, eight sexual orientations, and individuals with low vs. high risk of experiencing CSBD. Results A total of 4.8% of the participants were at high risk of experiencing CSBD. Country- and gender-based differences were observed, while no sexual-orientation-based differences were present in CSBD levels. Only 14% of individuals with CSBD have ever sought treatment for this disorder, with an additional 33% not having sought treatment because of various reasons. Both versions of the scale demonstrated excellent validity and reliability. Discussion and conclusions This study contributes to a better understanding of CSBD in underrepresented and underserved populations and facilitates its identification in diverse populations by providing freely accessible ICD-11-based screening tools in 26 languages. The findings may also serve as a crucial building block to stimulate research into evidence-based, culturally sensitive prevention and intervention strategies for CSBD that are currently missing from the literature.
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Affiliation(s)
- Beáta Bőthe
- Département de Psychologie, Université du Québec à Trois-Rivières, Trois-Rivières, Canada
- Département de Psychologie, Université de Montréal, Montréal, Canada
| | - Mónika Koós
- Doctoral School of Psychology, ELTE Eötvös Loránd University, Budapest, Hungary
- Institute of Psychology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Léna Nagy
- Doctoral School of Psychology, ELTE Eötvös Loránd University, Budapest, Hungary
- Institute of Psychology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Shane W. Kraus
- Department of Psychology, University of Nevada, Las Vegas, Las Vegas, NV, USA
| | - Zsolt Demetrovics
- Institute of Psychology, ELTE Eötvös Loránd University, Budapest, Hungary
- Centre of Excellence in Responsible Gaming, University of Gibraltar, Gibraltar, Gibraltar
| | - Marc N. Potenza
- Yale University School of Medicine, New Haven, CT, USA
- Connecticut Council on Problem Gambling, Wethersfield, CT, USA
- Connecticut Mental Health Center, New Haven, CT, USA
| | - Aurélie Michaud
- Département de Psychologie, Université de Montréal, Montréal, Canada
| | - Rafael Ballester-Arnal
- Departmento de Psicología Básica, Clínica y Psicobiología, University Jaume I of Castellón, Spain
| | - Dominik Batthyány
- Institute for Behavioural Addictions, Sigmund Freud University Vienna, Austria
| | - Sophie Bergeron
- Département de Psychologie, Université de Montréal, Montréal, Canada
| | - Joël Billieux
- Institute of Psychology, University of Lausanne, Lausanne, Switzerland
- Center for Excessive Gambling, Addiction Medicine, Lausanne University Hospitals (CHUV), Lausanne, Switzerland
| | - Peer Briken
- Institute for Sex Research, Sexual Medicine, and Forensic Psychiatry, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - Julius Burkauskas
- Laboratory of Behavioral Medicine, Neuroscience Institute, Lithuanian University of Health Sciences, Lithuania
| | - Georgina Cárdenas-López
- Virtual Teaching and Cyberpsychology Laboratory, School of Psychology, National Autonomous University of Mexico, Mexico
| | - Joana Carvalho
- William James Center for Research, Departamento de Educação e Psicologia, Universidade de Aveiro, Aveiro, Portugal
- CPUP: Center for Psychology at University of Porto, Portugal
| | - Jesús Castro-Calvo
- Department of Personality, Assessment, and Psychological Treatments, University of Valencia, Spain
| | - Lijun Chen
- Department of Psychology, College of Humanity and Social Science, Fuzhou University, China
| | - Giacomo Ciocca
- Section of Sexual Psychopathology, Department of Dynamic and Clinical Psychology, and Health Studies, Sapienza University of Rome, Rome, Italy
| | - Ornella Corazza
- Department of Clinical, Pharmaceutical and Biological Sciences, University of Hertfordshire, United Kingdom
- Department of Psychology and Cognitive Science, University of Trento, Italy
| | - Rita Csako
- Department of Psychology and Neuroscience, Auckland University of Technology, Auckland, New Zealand
| | | | | | - Loïs Fournier
- Institute of Psychology, University of Lausanne, Lausanne, Switzerland
| | - Hironobu Fujiwara
- Department of Neuropsychiatry, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Decentralized Big Data Team, RIKEN Center for Advanced Intelligence Project, Tokyo, Japan
- The General Research Division, Osaka University Research Center on Ethical, Legal and Social Issues, Osaka, Japan
| | - Johannes Fuss
- Institute of Forensic Psychiatry and Sex Research, Center for Translational Neuro- and Behavioral Sciences, University of Duisburg-Essen, Essen, Germany
| | - Roman Gabrhelík
- Department of Addictology, First Faculty of Medicine, Charles University, Prague, Czech Republic
- Department of Addictology, General University Hospital in Prague, Czech Republic
| | - Ateret Gewirtz-Meydan
- School of Social Work, Faculty of Social Welfare and Health Sciences, University of Haifa, Israel
| | - Biljana Gjoneska
- Macedonian Academy of Sciences and Arts, Republic of North Macedonia
| | - Mateusz Gola
- Institute of Psychology, Polish Academy of Sciences, Poland
- Institute for Neural Computations, University of California San Diego, USA
| | | | | | - Md. Saiful Islam
- Department of Public Health and Informatics, Jahangirnagar University, Savar, Dhaka, 1342, Bangladesh
- Centre for Advanced Research Excellence in Public Health, Dhaka, 1342, Bangladesh
| | | | - Martha C. Jiménez-Martínez
- Universidad Pedagógca y Tecnológica de Colombia, Colombia
- Grupo de Investigación Biomédica y de Patología, Colombia
| | - Tanja Jurin
- Department of Psychology, Humanities and Social Sciences, University of Zagreb, Croatia
| | - Ondrej Kalina
- Department of Educational Psychology and Psychology of Health, Pavol Jozef Safarik University in Kosice, Slovakia
| | - Verena Klein
- School of Psychology, University of Southampton, United Kingdom
| | - András Költő
- Health Promotion Research Centre, University of Galway, Ireland
| | - Chih-Ting Lee
- Department of Family Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Sang-Kyu Lee
- Department of Psychiatry, Hallym University Chuncheon Sacred Heart Hospital, South Korea
- Chuncheon Addiction Management Center, South Korea
| | - Karol Lewczuk
- Institute of Psychology, Cardinal Stefan Wyszynski University, Warsaw, Poland
| | - Chung-Ying Lin
- Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Biostatistics Consulting Center, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | | | - Christine Lochner
- SAMRC Unit on Risk & Resilience in Mental Disorders, Stellenbosch University, South Africa
| | | | - Kateřina Lukavská
- Department of Addictology, First Faculty of Medicine, Charles University, Prague, Czech Republic
- Faculty of Education, Department of Psychology, Charles University, Prague, Czech Republic
| | | | | | | | - Oľga Orosová
- Department of Educational Psychology and Psychology of Health, Pavol Jozef Safarik University in Kosice, Slovakia
| | | | | | | | - Gonzalo R. Quintana
- Departamento de Psicología y Filosofía, Facultad de Ciencias Sociales, Universidad de Tarapacá, Arica, Arica y Parinacota, Chile
| | | | - Jano Ramos-Diaz
- Facultad de Ciencias de la Salud, Universidad Privada del Norte, Lima, Perú
| | | | - Ann Rousseau
- Leuven School for Mass Communication, KU Leuven, Leuven, Belgium
| | - Marco De Tubino Scanavino
- Department of Psychiatry, Faculdade de Medicina, Universidade de São Paulo, Brazil
- Experimental Pathophisiology Post Graduation Program, Faculdade de Medicina, Universidade de São Paulo, Brazil
- Excessive Sexual Drive and Prevention of Negative Outcomes Associated to Sexual Behavior Outpatient Unit (AISEP), Institute of Psychiatry, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, Brazil
| | | | - Pratap Sharan
- Department of Psychiatry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Mami Shibata
- Department of Neuropsychiatry, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Sheikh Shoib
- Department of Psychology, Shardha University, India
| | - Vera L. Sigre Leirós
- Institute of Psychology, University of Lausanne, Lausanne, Switzerland
- Institute of Legal Psychiatry, Lausanne University Hospitals (CHUV), Lausanne, Switzerland
| | | | - Ognen Spasovski
- Faculty of Philosophy, Ss. Cyril and Methodius University in Skopje, Republic of North Macedonia
- Faculty of Philosophy, University of Ss. Cyril and Methodius in Trnava, Slovak Republic
| | - Vesta Steibliene
- Laboratory of Behavioral Medicine, Neuroscience Institute, Lithuanian University of Health Sciences, Lithuania
| | - Dan J. Stein
- SAMRC Unit on Risk & Resilience in Mental Disorders, Department of Psychiatry & Neuroscience Institute, University of Cape Town, South Africa
| | | | - Aleksandar Štulhofer
- Department of Sociology, Faculty of Humanities and Social Sciences, University of Zagreb, Croatia
| | - Berk C. Ünsal
- Doctoral School of Psychology, ELTE Eötvös Loránd University, Budapest, Hungary
- Institute of Psychology, ELTE Eötvös Loránd University, Budapest, Hungary
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Eriksson H, Fall N, Ivemeyer S, Knierim U, Simantke C, Fuerst-Waltl B, Winckler C, Weissensteiner R, Pomiès D, Martin B, Michaud A, Priolo A, Caccamo M, Sakowski T, Stachelek M, Spengler Neff A, Bieber A, Schneider C, Alvåsen K. Strategies for keeping dairy cows and calves together – a cross-sectional survey study. Animal 2022; 16:100624. [DOI: 10.1016/j.animal.2022.100624] [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] [Received: 04/09/2022] [Revised: 07/21/2022] [Accepted: 07/26/2022] [Indexed: 11/30/2022] Open
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Cremilleux M, Coppa M, Bouchon M, Delaby L, Beaure G, Constant I, Natalello A, Martin B, Michaud A. Effects of forage quantity and access-time restriction on feeding behaviour, feed efficiency, nutritional status, and dairy performance of dairy cows fed indoors. Animal 2022; 16:100608. [PMID: 35963104 DOI: 10.1016/j.animal.2022.100608] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 07/05/2022] [Accepted: 07/11/2022] [Indexed: 11/25/2022] Open
Abstract
Optimising feed is a key challenge for dairy livestock systems, as forage stock shortages are increasingly frequent and feed is the biggest operating cost. The aim of this experiment was to evaluate the effects of reducing forage quantity and access time on dairy performance and animal nutritional status during indoor feeding. Twenty-seven Montbéliarde and Holstein cows were randomly allocated to three groups of nine cows balanced by breed, parity, days in milk, and milk yield. The three groups were given 3.9 kg DM/day of second-cut hay and 4.5 kg/day of concentrate and either i) ad libitum access to first-cut hay (Ad Libitum group; AL), ii) 10.5 kg/day of first-cut hay (Quantity-restricted group; QR), or iii) 10.5 kg/day of first-cut hay but with access time restricted to only 2 h in the morning and 2 h in the afternoon (Quantity-and-Time-restricted group; QTR). Milk yield, composition and coagulation properties, cow nutritional status (weight, body condition score, blood metabolites) and cow activities were recorded. The AL group ingested 10 % more feed than the QR group and 16 % more feed than the QTR group. Organic matter digestibility was lower in the AL group than in the QR and QTR groups whereas feed efficiency did not differ. Milk yield was not significantly different among the three groups. Compared to the QR and QTR groups, the AL group had significantly higher milk fat (35.9 vs 32.9 and 32.8 g/kg of milk) and milk protein content (29.5 vs 27.7 and 28.5 g/kg of milk). QR and QTR cows mobilised their body fat, resulting in a lower final body condition score, and tended to have a lower blood non-esterified fatty acid concentration than the AL group. QTR cows showed greater body fat mobilisation, but their final corrected BW was not different from AL cows. Access-time restriction did not impact fat and protein content but led to decreased casein, lactose contents and casein-to-whey protein ratio. The forage savings achieved through this feed management practice could prove economically substantial when forage prices increase. This practice can be of interest in grassland systems to overcome certain climatic hazards without having to resort to purchases or to increase the farm's forage autonomy.
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Affiliation(s)
- M Cremilleux
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, 63122 Saint-Genès-Champanelle, France.
| | - M Coppa
- Herbipôle, INRAE, 63122 Saint-Genès-Champanelle, France
| | - M Bouchon
- Herbipôle, INRAE, 63122 Saint-Genès-Champanelle, France
| | - L Delaby
- INRAE, Institut Agro, Physiologie, Environnement, Génétique pour l'Animal et les Systèmes d'Elevage, 35590 Saint Gilles, France
| | - G Beaure
- Facilitator for the Nonprofit 'Association Eleveurs Autrement', 63820 Laqueuille, France
| | - I Constant
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, 63122 Saint-Genès-Champanelle, France
| | - A Natalello
- Department of Agriculture, Food and Environment (Di3A), University of Catania, Via Valdisavoia 5, 95123 Catania, Italy
| | - B Martin
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, 63122 Saint-Genès-Champanelle, France
| | - A Michaud
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, 63122 Saint-Genès-Champanelle, France
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Gagnon E, Girard A, Bourgault É. Gobeil J, Michaud A, Mathieu P, Arsenault B. Genetic control of body weight by the human brain proteome. Atherosclerosis 2022. [DOI: 10.1016/j.atherosclerosis.2022.06.163] [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: 11/27/2022]
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Lauda-Maillen M, Lemaignen A, Puyade M, Catroux M, Le Moal G, Beraud G, El Hajj H, Michaud A, Destrieux C, Bernard L, Rammaert B, Cazenave-Roblot F. Feasibility of early switch to oral antibiotic in brain abscesses and empyema: a multicentre retrospective study. Eur J Clin Microbiol Infect Dis 2020; 40:209-213. [PMID: 32671654 DOI: 10.1007/s10096-020-03904-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 04/07/2020] [Indexed: 11/26/2022]
Affiliation(s)
- M Lauda-Maillen
- Université de Poitiers, Poitiers, France.
- Service de Maladies Infectieuses et Tropicales, CHU de Poitiers, 2 rue de la Milétrie CS 90577, 86021, Poitiers cedex, France.
| | - A Lemaignen
- Université de Tours, Tours, France
- Service de Médecine Interne et Maladies Infectieuses, CHRU de Tours, Hôpital Bretonneau, Tours, France
| | - M Puyade
- Service de Médecine Interne, CHU de Poitiers, Poitiers, France
| | - M Catroux
- Service de Maladies Infectieuses et Tropicales, CHU de Poitiers, 2 rue de la Milétrie CS 90577, 86021, Poitiers cedex, France
| | - G Le Moal
- Service de Maladies Infectieuses et Tropicales, CHU de Poitiers, 2 rue de la Milétrie CS 90577, 86021, Poitiers cedex, France
| | - G Beraud
- Service de Maladies Infectieuses et Tropicales, CHU de Poitiers, 2 rue de la Milétrie CS 90577, 86021, Poitiers cedex, France
| | - H El Hajj
- Service de Neurochirurgie, CHU de Poitiers, Poitiers, France
| | - A Michaud
- Service de Microbiologie, CHU de Poitiers, Poitiers, France
| | - C Destrieux
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- Service de Neurochirurgie, CHRU de Tours, Tours, France
| | - L Bernard
- Université de Tours, Tours, France
- Service de Médecine Interne et Maladies Infectieuses, CHRU de Tours, Hôpital Bretonneau, Tours, France
| | - B Rammaert
- Université de Poitiers, Poitiers, France
- Service de Maladies Infectieuses et Tropicales, CHU de Poitiers, 2 rue de la Milétrie CS 90577, 86021, Poitiers cedex, France
- INSERM U1070, Poitiers, France
| | - F Cazenave-Roblot
- Université de Poitiers, Poitiers, France
- Service de Maladies Infectieuses et Tropicales, CHU de Poitiers, 2 rue de la Milétrie CS 90577, 86021, Poitiers cedex, France
- INSERM U1070, Poitiers, France
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Gernigon C, Othenin J, Michaud A, Vayr F, Rousseau V, Montastier E, Lapeyre-Mestre M, Niezborala M, Hérin F. Évaluation de la consommation médicamenteuse d’une population de travailleurs de la région Toulousaine en 2016. ARCH MAL PROF ENVIRO 2020. [DOI: 10.1016/j.admp.2019.12.051] [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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Joncour A, Puyade M, Michaud A, Tourani JM, Cazenave-Roblot F, Rammaert B. Is current initial empirical antibiotherapy appropriate to treat bloodstream infections in short-duration chemo-induced febrile neutropenia? Support Care Cancer 2019; 28:3103-3111. [DOI: 10.1007/s00520-019-05113-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Accepted: 10/06/2019] [Indexed: 11/28/2022]
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Meriglier E, Michaud A, Plouzeau C, Raud-Raynier P, Burucoa C, Roblot F. A fatal case of Streptococcus uberis endocarditis on cardiovascular implantable electronic device. Med Mal Infect 2018; 48:549-551. [DOI: 10.1016/j.medmal.2018.07.003] [Citation(s) in RCA: 1] [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] [Received: 02/19/2018] [Revised: 03/30/2018] [Accepted: 07/24/2018] [Indexed: 11/27/2022]
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Garcia M, Bouvet P, Petitpas F, Jayle C, Legeay C, Sautereau J, Michaud A, Burucoa C, Plouzeau C. First case report of a human sepsis involving a recently identified anaerobic agent: Bacteroides faecis. Anaerobe 2016; 42:74-77. [PMID: 27544037 DOI: 10.1016/j.anaerobe.2016.08.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 04/12/2016] [Revised: 08/10/2016] [Accepted: 08/14/2016] [Indexed: 11/17/2022]
Abstract
Up until now, Bacteroides faecis, a Gram-negative, anaerobic, non-motile, nonsporeforming rod has been principally described as a commensal microbe isolated from the feces of healthy adults. We report the first case of human Bacteroides faecis sepsis after removal of suspected post-colonic ischemia colonized epicardic electrodes. Electrodes and blood cultures both grew Gram-negative anaerobic rods but usual phenotypic methods and 16S rARN gene sequencing failed to ensure its species identification. B. faecis was finally identified using hsp60 gene sequencing. Because this species is not well-known and is difficult to identify, it may have been overlooked or misidentified in previous studies.
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Affiliation(s)
- M Garcia
- Laboratoire de Virologie et Mycobactériologie, CHU de Poitiers, Poitiers, France; EA 4331 LITEC, Université de Poitiers, Poitiers, France.
| | - P Bouvet
- Centre National de Référence des Bactéries anaérobies et du botulisme, Institut Pasteur, Paris, France
| | - F Petitpas
- Service d'Anesthésie et de Réanimation chirurgicale, CHU de Poitiers, Poitiers, France
| | - C Jayle
- Service de Chirurgie Cardio-Thoracique, CHU de Poitiers, Poitiers, France
| | - C Legeay
- Centre National de Référence des Bactéries anaérobies et du botulisme, Institut Pasteur, Paris, France
| | - J Sautereau
- Centre National de Référence des Bactéries anaérobies et du botulisme, Institut Pasteur, Paris, France
| | - A Michaud
- Laboratoire de Bactériologie, CHU de Poitiers, Poitiers, France
| | - C Burucoa
- EA 4331 LITEC, Université de Poitiers, Poitiers, France; Laboratoire de Bactériologie, CHU de Poitiers, Poitiers, France
| | - C Plouzeau
- Laboratoire de Bactériologie, CHU de Poitiers, Poitiers, France; Unité de Microbiologie Moléculaire et Séquençage, CHU de Poitiers, Poitiers, France
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Abstract
EZH2, the main catalytic component of the Polycomb Repressive Complex 2 (PRC2) is apparently upregulated in most solid tumors. Furthermore its expression generally associates with poor prognosis. It was proposed that this correlation reflects a causal event, EZH2 mediating the silencing of key tumor suppressor loci. In contrast, we recently showed that EZH2 is dispensable for solid tumor development and that its elevated expression reflects the abnormally high proliferation rate of cancer cells. Here, we investigate the functional association between EZH2 expression and silencing of key tumor suppressor loci and further illustrate the confounding effect of proliferation on EZH2′s association to outcome.
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Affiliation(s)
- M Wassef
- a Institut Curie , Paris , France.,b INSERM U934 , Paris , France.,c CNRS UMR3215 , Paris , France
| | - A Michaud
- a Institut Curie , Paris , France.,b INSERM U934 , Paris , France.,c CNRS UMR3215 , Paris , France
| | - R Margueron
- a Institut Curie , Paris , France.,b INSERM U934 , Paris , France.,c CNRS UMR3215 , Paris , France
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Michaud A, Gilbert P, Gatzoulis M, Pibarot P, Rodés-Cabau J, Perron J, Bedard E. LEFT VENTRICULAR CONTRACTILE RESERVE ASSESSED BY EXERCISE STRESS ECHOCARDIOGRAM IN ADULTS WITH REPAIRED TETRALOGY OF FALLOT: A NOVEL EARLY MARKER OF INTRINSIC MYOCARDIAL DISEASE? Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.310] [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] Open
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Rash D, Lentz S, Tait L, Michaud A, Hess C, Mayadev J. Prospective Evaluation of Patient Satisfaction Following the Use of Education Materials for Cervical Cancer Brachytherapy. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1506] [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: 11/24/2022]
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Uhart M, Leroy B, Michaud A, Maire P, Bourguignon L. [Inter-individual and intra-individual pharmacokinetic variability during teicoplanin therapy in geriatric patients]. Med Mal Infect 2013; 43:295-8. [PMID: 23906420 DOI: 10.1016/j.medmal.2013.05.008] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 04/22/2013] [Accepted: 05/22/2013] [Indexed: 11/17/2022]
Abstract
OBJECTIVES The authors had for aim to assess the inter- and intra-individual variability of teicoplanin pharmacokinetic parameters in geriatric patients. METHODS A cohort of 90 geriatric patients, treated with teicoplanin, was used to build two models describing the pharmacokinetics of teicoplanin, at the beginning and at the end of treatment respectively. RESULTS The inter- and intra-individual variability of parameters were important as shown respectively by the coefficients of variation of pharmacokinetic parameters ranging from 125 to 694% and the half-life change during the treatment (by a factor of three to more than 30) for 60% of patients. CONCLUSIONS The results revealed that elderly patients presented significant variability, which was only partly explained by the renal function. Therapeutic monitoring of teicoplanin in geriatric patients should be undertaken at the end of the loading dose and repeatedly during the maintenance phase to prevent over- or underexposure.
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Affiliation(s)
- M Uhart
- Service pharmaceutique, hôpital Antoine-Charial, Hospices Civils de Lyon, groupement hospitalier de gériatrie, 40, avenue de la Table-de-Pierre, 69340 Francheville, France.
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Michaud A, Pelletier M, Veilleux A, Fortier M, Tchernof A. 165 Alteration of the prostaglandin F2alpha/F2 ratio in omental adipocytes of obese women. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.114] [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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Roy M, Tanguay A, Michaud A, Déry U, Maire S, Hébert D, Degrâce M, Larose E, Rodés-Cabau J, Rinfret S, Barbeau G, Gleeton O, Proulx G, Noël B, Roy L, Nguyen C, De Larochellière R, Bertrand O, Déry J. 438 Use of pre-hospital ECG improves time to reperfusion in STEMI patients. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.371] [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: 11/27/2022] Open
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Michaud A, Delmont E, Jeandel PY, Desnuelle C. [Improvement of severe and intravenous immunoglobulin-dependent multifocal motor neuropathy with conduction block after long-term rituximab]. Rev Neurol (Paris) 2011; 167:916-20. [PMID: 21752414 DOI: 10.1016/j.neurol.2011.02.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2010] [Revised: 01/09/2011] [Accepted: 02/02/2011] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Some patients suffering from multifocal motor neuropathy with conduction blocks (MMNCB) are still disabled after treatment with intravenous immunoglobulin (IVIg). CASE REPORT We report the benefits of a combination of rituximab (RTX) and IVIg in the case of a 72-year-old man with MMNCB. DISCUSSION Despite an IVIg treatment, the patient had severe motor weakness of the four limbs which limited daily living activity. Azathioprine, mycophenolate mofetyl and cyclophosphamid did not improve the patient's status. Adjunction of rituximab to IVIg therapy increased muscle strength measured on MRC sum score and reduced disability evaluated on ONLS (Overall Neuropathy Limitation Scale) score in the long term (37 months). In spite of the improvement of his neurological status, the patient remained dependent on IVIg. CONCLUSION RTX could be proposed as a long-term complementary treatment for some severe cases of IVIg-dependent NMMBC. These results must be confirmed in a randomized controlled study.
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Affiliation(s)
- A Michaud
- Centre de référence des maladies neuromusculaires et SLA, hôpital de l'Archet, 1, route Saint-Antoine-de-Ginestière, BP 3979, 06202 Nice, cedex 3, France
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Parcevaux M, Boisson V, Lemant J, Antok E, Thibault L, Garcia C, Bugnon O, Tixier F, Belin N, André H, Michaud A, Braunberger E, Vandroux D, Ocquidant P, Rouanet JF, Ingles M, Filleul L, Winer A. [Outbreak of influenza A(H1N1)/2009: description of cases and crisis management in a ICU in Reunion Island]. Ann Fr Anesth Reanim 2010; 29:902-908. [PMID: 21112729 DOI: 10.1016/j.annfar.2010.09.012] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Accepted: 09/21/2010] [Indexed: 05/30/2023]
Abstract
OBJECTIVES to describe the characteristics, treatment and outcome of critically ill patients with influenza A(H1N1) infection at St Pierre Hospital in Reunion Island during the 2009 outbreak, as well as the measures of care reorganization implemented to face them. PATIENTS AND METHODS prospective observational study of probable and confirmed cases of influenza A (H1N1)/2009 infection concerning hospitalized patients in a polyvalent intensive care unit (ICU). RESULTS thirteen patients have been included between August and September 2009. Three (23 %) didn't have any medical history. The median age was 42 [22-69]. Eleven have required pulmonary ventilation for 10.3 days (± 8). Three (23 %) have developed an ARDS. Three patients (23 %) died. To cope with the influx of cases and considering our situation of geographic isolation, it has been needed to totally rework the organization of care: set-up of a specific welcoming channel, division into sectors of the department, opening of additional beds, new on-duty assignment, inter and intra hospital cooperation. CONCLUSION reunion Island has been an experimental lab of crisis management during the H1N1/2009 epidemic, several months ahead of the mother country. To anticipate the reorganization of care in intensive care units during an outbreak period, particularly in small units or units isolated like ours, looks to us a must so to quietly face a sharp influx of patients.
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Affiliation(s)
- M Parcevaux
- Service de réanimation polyvalente, centre hospitalier régional site Sud, BP 350, 97448 Saint-Pierre cedex, Réunion.
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Marsano J, Won S, Li B, Sreeraman R, Michaud A, Perks J, Purdy J, Chen A. Is Daily Image-guided Radiotherapy (IGRT) Really Necessary in the Treatment of Head and Neck Cancer with Intensity-modulated Radiotherapy (IMRT)? Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1458] [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: 11/30/2022]
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Won S, Marsano J, Li B, Sreeraman R, Michaud A, Perks J, Purdy J, Chen A. Long-term Single Institutional Experience with the Use of Daily Image-guided Radiotherapy (IGRT) for the Treatment of Head and Neck Cancer. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1506] [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: 11/25/2022]
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Jennelle R, Perks J, Sreeraman R, Michaud A, Li B, Vijayakumar S, Purdy J, Chen A. Impact of Weight Loss on Patient Alignment and Setup Variations as Determined using Daily Cone-beam Computed Tomography for Head and Neck Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.210] [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]
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Chen A, Perks J, Jennelle R, Sreeraman R, Michaud A, Li B, Vijayakumar S, Purdy J. Comparison of Daily versus Less-than-daily Image-guided Radiotherapy Protocols in the Treatment of Head and Neck Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.1276] [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: 10/21/2022]
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Michaud A, Dardari R, Charrier E, Cordero P, Duval M. 406: Effect of IL-7 on Human NK Cells. Biol Blood Marrow Transplant 2008. [DOI: 10.1016/j.bbmt.2007.12.416] [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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Guilloton L, Michaud A, Potier V, Le Berre J, Drouet A, Felten D. Ataxie et confusion après traitement par 5-fluorouracile. Rev Med Interne 2005; 26:986-7. [PMID: 16337869 DOI: 10.1016/j.revmed.2005.02.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2005] [Accepted: 02/21/2005] [Indexed: 11/21/2022]
Affiliation(s)
- L Guilloton
- Service de neurologie, HIA Desgenettes, 108, boulevard Pinel 69275 Lyon cedex 03, France.
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Koechlin C, Maltais F, Saey D, Michaud A, LeBlanc P, Hayot M, Préfaut C. Hypoxaemia enhances peripheral muscle oxidative stress in chronic obstructive pulmonary disease. Thorax 2005; 60:834-41. [PMID: 15964914 PMCID: PMC1747208 DOI: 10.1136/thx.2004.037531] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Because oxidative stress affects muscle function, the underlying mechanism to explain exercise induced peripheral muscle oxidative stress in patients with chronic obstructive pulmonary disease (COPD) is clinically relevant. This study investigated whether chronic hypoxaemia in COPD worsens peripheral muscle oxidative stress and whether an abnormal muscle inflammatory process is associated with it. METHODS Nine chronically hypoxaemic and nine non-hypoxaemic patients performed repeated knee extensions until exhaustion. Biopsy specimens were taken from the vastus lateralis muscle before and 48 hours after exercise. Muscle oxidative stress was evaluated by lipid peroxidation (lipofuscin and thiobarbituric acid reactive substances (TBARs)) and oxidised proteins. Inflammation was evaluated by quantifying muscle neutrophil and tumour necrosis factor (TNF)-alpha levels. RESULTS When both groups were taken together, arterial oxygen pressure was positively correlated with quadriceps endurance time (n = 18, r = 0.57; p < 0.05). At rest, quadriceps lipofuscin inclusions were significantly greater in hypoxaemic patients than in non-hypoxaemic patients (2.9 (0.2) v 2.0 (0.3) inclusions/fibre; p < 0.05). Exercise induced a greater increase in muscle TBARs and oxidised proteins in hypoxaemic patients than in non-hypoxaemic patients (40.6 (9.1)% v 10.1 (5.8)% and 51.2 (11.9)% v 3.7 (12.2)%, respectively, both p = 0.01). Neutrophil levels were significantly higher in hypoxaemic patients than in non-hypoxaemic patients (53.1 (11.6) v 21.5 (11.2) counts per fibre x 10(-3); p < 0.05). Exercise did not alter muscle neutrophil levels in either group. Muscle TNF-alpha was not detected at baseline or after exercise. CONCLUSION Chronic hypoxaemia was associated with lower quadriceps endurance time and worsened muscle oxidative stress at rest and after exercise. Increased muscle neutrophil levels could be a source of the increased baseline oxidative damage. The involvement of a muscle inflammatory process in the exercise induced oxidative stress of patients with COPD remains to be shown.
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Affiliation(s)
- C Koechlin
- Laboratoire de Physiologie des Interactions, Service Central de Physiologie Clinique, Hôpital Arnaud de Villeneuve, 34295 Montpellier cedex 5, France.
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Hayot M, Michaud A, Koechlin C, Caron MA, Leblanc P, Préfaut C, Maltais F. Skeletal muscle microbiopsy: a validation study of a minimally invasive technique. Eur Respir J 2005; 25:431-40. [PMID: 15738285 DOI: 10.1183/09031936.05.00053404] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.9] [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: 11/05/2022]
Abstract
The study of the peripheral skeletal muscle function in patients with chronic obstructive pulmonary disease (COPD) is of growing interest, but often requires biopsies, usually with the Bergström technique. The current study was designed to test the validity of a minimally invasive technique: the microbiopsy. In 17 patients with COPD and four normal subjects, two specimens of the vastus lateralis were taken percutaneously under local anaesthesia, one with a 16-gauge needle (microbiopsy) and the other with the Bergström needle. The enzymatic activity of citrate synthase (CS) and phosphofructokinase (PFK), and the myosin heavy chain (MyoHC) composition were measured for both techniques. The subjects reported no pain or much less with the microbiopsy compared with the Bergström biopsy. The microbiopsy sample weight reached 55+/-17 mg. The two techniques showed excellent agreement for CS activity and MyoHC composition. The PFK activity did not differ statistically between the techniques, but the agreement was moderate. The agreement between both biopsy techniques was stable over time. The median (range) fibre number within the microbiopsy specimens was 144 (38-286). In conclusion, the current study shows the feasibility and validity of a minimally invasive muscle biopsy technique that appears more comfortable for subjects, compared with the Bergström technique.
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Affiliation(s)
- M Hayot
- Service Central de Physiologie Clinique, Centre Hospitalier Universitaire Arnaud de Villeneuve, 34295 Montpellier Cedex 5, France.
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Verdon F, Burnand B, Stubi CLF, Bonard C, Graff M, Michaud A, Bischoff T, de Vevey M, Studer JP, Herzig L, Chapuis C, Tissot J, Pécoud A, Favrat B. Iron supplementation for unexplained fatigue in non-anaemic women: double blind randomised placebo controlled trial. BMJ 2003; 326:1124. [PMID: 12763985 PMCID: PMC156009 DOI: 10.1136/bmj.326.7399.1124] [Citation(s) in RCA: 183] [Impact Index Per Article: 8.7] [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: 02/06/2023]
Abstract
OBJECTIVE To determine the subjective response to iron therapy in non-anaemic women with unexplained fatigue. DESIGN Double blind randomised placebo controlled trial. SETTING Academic primary care centre and eight general practices in western Switzerland. PARTICIPANTS 144 women aged 18 to 55, assigned to either oral ferrous sulphate (80 mg/day of elemental iron daily; n=75) or placebo (n=69) for four weeks. MAIN OUTCOME MEASURES Level of fatigue, measured by a 10 point visual analogue scale. RESULTS 136 (94%) women completed the study. Most had a low serum ferritin concentration; <or= 20 microg/l in 69 (51%) women. Mean age, haemoglobin concentration, serum ferritin concentration, level of fatigue, depression, and anxiety were similar in both groups at baseline. Both groups were also similar for compliance and dropout rates. The level of fatigue after one month decreased by -1.82/6.37 points (29%) in the iron group compared with -0.85/6.46 points (13%) in the placebo group (difference 0.95 points, 95% confidence interval 0.32 to 1.62; P=0.004). Subgroups analysis showed that only women with ferritin concentrations <or= 50 microg/l improved with oral supplementation. CONCLUSION Non-anaemic women with unexplained fatigue may benefit from iron supplementation. The effect may be restricted to women with low or borderline serum ferritin concentrations.
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Affiliation(s)
- F Verdon
- General Practice Unit, University of Lausanne, rue du Bugnon 44, 1011 Lausanne, Switzerland
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Michaud A, Paquin S. The security of urban women: practice, research, and partnerships. Inj Prev 2002; 8 Suppl 4:IV15-6. [PMID: 12460950 PMCID: PMC1765504 DOI: 10.1136/ip.8.suppl_4.iv15] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
All public bodies whose mandate includes responsibility for the quality of urban life cannot ignore the question of security. On a global level, it is agreed that action needs to be taken locally, with the input of everyone involved. Since women have more at stake where safety issues are concerned, it is logical that security plans be drawn up that prioritize them. The interaction of public bodies, community organizations, and individual women is in itself innovative, enriching everyone involved, despite the inherent drawbacks and demands. International information networks on women's security are expanding and can help the new partnerships refine their working methods, to the benefit of all, regardless of gender. Still, the transfer of knowledge between partners and among the population is fundamental and demanding. The same applies to the need to develop methods and criteria of evaluation that are adapted to the specific realities of the partnership for prevention of crime and violence towards women.
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Affiliation(s)
- A Michaud
- Programme Femmes et ville, Ville de Montréal, Montréal, Canada
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Iturrioz X, Rozenfeld R, Michaud A, Corvol P, Llorens-Cortes C. Study of asparagine 353 in aminopeptidase A: characterization of a novel motif (GXMEN) implicated in exopeptidase specificity of monozinc aminopeptidases. Biochemistry 2001. [PMID: 11724556 DOI: 10.1021/bi11409j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
Aminopeptidase A (EC 3.4.11.7, APA) is a 160 kDa membrane-bound zinc enzyme that contains the HEXXH consensus sequence found in members of the zinc metalloprotease family, the zincins. In addition, the monozinc aminopeptidases are characterized by another conserved motif, GXMEN, the glutamate residue of which has been shown to be implicated in the exopeptidase specificity of aminopeptidase A [Vazeux G. (1998) Biochem. J. 334, 407-413]. In carboxypeptidase A (EC 3.4.17.1, CPA), the exopeptidase specificity is conferred by an arginine residue (Arg-145) and an asparagine residue (Asn-144). Thus, we hypothesized that Asn-353 of the GXMEN motif in APA plays a similar role to Asn-144 in CPA and contributes to the exopeptidase specificity of APA. We investigated the functional role of Asn-353 in APA by substituting this residue with a glutamine (Gln-353), an alanine (Ala-353) or an aspartate (Asp-353) residue by site-directed mutagenesis. Expression of wild-type and mutated APAs revealed that Gln-353 and Ala-353 are similarly routed and glycosylated to the wild-type APA, whereas Asp-353 is trapped intracellularly and partially glycosylated. Kinetic studies, using alpha-L-glutamyl-beta-naphthylamide (GluNA) as a substrate showed that the K(m) values of the mutants Gln-353 and Ala-353 were increased 11- and 8-fold, respectively, whereas the k(cat) values were decreased (2-fold) resulting in a 24- and 14-fold reduction in cleavage efficiency. When alpha-L-aspartyl-beta-naphthylamide or angiotensin II were used as substrates, the mutations had a greater effect on k(cat), leading to a similar decrease in cleavage efficiencies as that observed with GluNA. We then measured the inhibitory potencies of several classes of inhibitors, glutamate thiol, glutamine thiol and two isomers (L- or D-) of glutamate phosphonate to explore the functional role of Asn-353. The data indicate that Asn-353 is critical for the integrity and catalytic activity of APA. This residue is involved in substrate binding via interactions with the free N-terminal part and with the P1 carboxylate side chain of the substrate. In conclusion, Asn-353 of the GXMEN motif, together with Glu-352, contributes to the exopeptidase specificity of APA and plays an equivalent role to Asn-144 in CPA.
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Affiliation(s)
- X Iturrioz
- INSERM Unité 36 - Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
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Iturrioz X, Rozenfeld R, Michaud A, Corvol P, Llorens-Cortes C. Study of asparagine 353 in aminopeptidase A: characterization of a novel motif (GXMEN) implicated in exopeptidase specificity of monozinc aminopeptidases. Biochemistry 2001; 40:14440-8. [PMID: 11724556 DOI: 10.1021/bi011409j] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [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: 11/29/2022]
Abstract
Aminopeptidase A (EC 3.4.11.7, APA) is a 160 kDa membrane-bound zinc enzyme that contains the HEXXH consensus sequence found in members of the zinc metalloprotease family, the zincins. In addition, the monozinc aminopeptidases are characterized by another conserved motif, GXMEN, the glutamate residue of which has been shown to be implicated in the exopeptidase specificity of aminopeptidase A [Vazeux G. (1998) Biochem. J. 334, 407-413]. In carboxypeptidase A (EC 3.4.17.1, CPA), the exopeptidase specificity is conferred by an arginine residue (Arg-145) and an asparagine residue (Asn-144). Thus, we hypothesized that Asn-353 of the GXMEN motif in APA plays a similar role to Asn-144 in CPA and contributes to the exopeptidase specificity of APA. We investigated the functional role of Asn-353 in APA by substituting this residue with a glutamine (Gln-353), an alanine (Ala-353) or an aspartate (Asp-353) residue by site-directed mutagenesis. Expression of wild-type and mutated APAs revealed that Gln-353 and Ala-353 are similarly routed and glycosylated to the wild-type APA, whereas Asp-353 is trapped intracellularly and partially glycosylated. Kinetic studies, using alpha-L-glutamyl-beta-naphthylamide (GluNA) as a substrate showed that the K(m) values of the mutants Gln-353 and Ala-353 were increased 11- and 8-fold, respectively, whereas the k(cat) values were decreased (2-fold) resulting in a 24- and 14-fold reduction in cleavage efficiency. When alpha-L-aspartyl-beta-naphthylamide or angiotensin II were used as substrates, the mutations had a greater effect on k(cat), leading to a similar decrease in cleavage efficiencies as that observed with GluNA. We then measured the inhibitory potencies of several classes of inhibitors, glutamate thiol, glutamine thiol and two isomers (L- or D-) of glutamate phosphonate to explore the functional role of Asn-353. The data indicate that Asn-353 is critical for the integrity and catalytic activity of APA. This residue is involved in substrate binding via interactions with the free N-terminal part and with the P1 carboxylate side chain of the substrate. In conclusion, Asn-353 of the GXMEN motif, together with Glu-352, contributes to the exopeptidase specificity of APA and plays an equivalent role to Asn-144 in CPA.
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Affiliation(s)
- X Iturrioz
- INSERM Unité 36 - Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
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Junot C, Gonzales MF, Ezan E, Cotton J, Vazeux G, Michaud A, Azizi M, Vassiliou S, Yiotakis A, Corvol P, Dive V. RXP 407, a selective inhibitor of the N-domain of angiotensin I-converting enzyme, blocks in vivo the degradation of hemoregulatory peptide acetyl-Ser-Asp-Lys-Pro with no effect on angiotensin I hydrolysis. J Pharmacol Exp Ther 2001; 297:606-11. [PMID: 11303049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
The phosphinic peptide RXP 407 has recently been identified as the first potent selective inhibitor of the N-active site (domain) of angiotensin-converting enzyme (ACE) in vitro. The aim of this study was to probe the in vivo efficacy of this new ACE inhibitor and to assess its effect on the metabolism of AcSDKP and angiotensin I. In mice infused with increasing doses of RXP 407 (0.1--30 mg/kg/30 min), plasma concentrations of AcSDKP, a physiological substrate of the N-domain, increased significantly and dose dependently toward a plateau 4 to 6 times the basal levels. RXP 407 significantly and dose dependently inhibited ex vivo plasma ACE N-domain activity, whereas it had no inhibitory activity toward the ACE C-domain. RXP 407 (10 mg/kg) did not inhibit the pressor response to an i.v. angiotensin I bolus injection in mice. In contrast, lisinopril infusion (5 and 10 mg/kg/30 min) affected the metabolism of both AcSDKP and angiotensin I. Thus, RXP 407 is the first ACE inhibitor that might be used to control selectively AcSDKP metabolism with no effect on blood pressure regulation.
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Affiliation(s)
- C Junot
- Commissariat à l'Energie Atomique, Service de Pharmacologie et d'Immunologie, Gif-sur-Yvette, France
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Mialon P, Barthélémy L, Michaud A, Lacour JM. Pulmonary function in men after repeated sessions of oxygen breathing at 0.25 MPa for 90 min. Aviat Space Environ Med 2001; 72:215-8. [PMID: 11277287] [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: 02/19/2023]
Abstract
HYPOTHESIS We wanted to evaluate the pulmonary effects of discontinuous oxygen breathing (15 min O2, 2 min air breaks, 15:2), at 0.25 MPa once a day for 90 min O2 (6 sequences) over 10 d. This sequence, which has never been evaluated, is currently used in our hyperbaric therapy center. METHODS Clinical and functional pulmonary status (questionnaire, spirometry, flow/volume loop, pulmonary diffusing capacity for carbon monoxide) was assessed in 10 non-smoking healthy volunteers after one exposure at 0.25 MPa consisting of 90 min of discontinuous oxygen breathing (15:2) and in 10 non-smoking patients who received a hyperbaric treatment consisting of 90 min of the same discontinuous O2 breathing (15:2) once a day over 10 d. The patients received daily intravenous methylprednisolone (1 mg x kg(-1)) and nicergoline (60 mg). RESULTS There were no respiratory symptoms in either group. As expected, for a single exposure of that duration, lung function did not change in volunteers; however, a significant decrease in maximal expiratory flows (MEF) at 50 (-15%) and 25% (-33%) of forced vital capacity (p < 0.05) without change in forced vital capacity (FVC) appeared in patients treated over 10 d. CONCLUSION Repetition of the 15:2 oxygen breathing sequence for 90 min once a day over 10 d led to greater flow limitation in peripheral airways than reported after continuous oxygen breathing of 210 min at 0.3 MPa which showed a 7% decrement in MEF50 and a 12% decrement in MEF25. No studies reporting these indexes were found in the 0.2-0.25 MPa range. Similar decrements in MEF50 and MEF25 with steady FVC have been reported after 14 d of daily hyperbaric therapy (0.24 MPa) with 30:5 sequence (-9% and -13%, respectively), 80% of the patients were symptom free. Similarily, our patients were all symptom free and remained so 1 yr after the study, hence, this toxicity is of weak clinical significance in subjects free of inflammatory lung diseases. HBO therapy, though safe, is not totally without effect on the lung.
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Affiliation(s)
- P Mialon
- Pulmonary Function Test Unit, Department of Anesthesiology, Brest, France.
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Eyries M, Michaud A, Deinum J, Agrapart M, Chomilier J, Kramers C, Soubrier F. Increased shedding of angiotensin-converting enzyme by a mutation identified in the stalk region. J Biol Chem 2001; 276:5525-32. [PMID: 11076943 DOI: 10.1074/jbc.m007706200] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [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: 11/06/2022] Open
Abstract
Angiotensin-converting enzyme (ACE), an enzyme that plays a major role in vasoactive peptide metabolism, is a type 1 ectoprotein, which is released from the plasma membrane by a proteolytic cleavage occurring in the stalk sequence adjacent to the membrane anchor. In this study, we have discovered the molecular mechanism underlying the marked increase of plasma ACE levels observed in three unrelated individuals. We have identified a Pro(1199) --> Leu mutation in the juxtamembrane stalk region. In vitro analysis revealed that the shedding of [Leu(1199)]ACE was enhanced compared with wild-type ACE. The solubilization process of [Leu(1199)]ACE was stimulated by phorbol esters and inhibited by compound 3, an inhibitor of ACE-secretase. The results of Western blot analysis were consistent with a cleavage at the major described site (Arg(1203)/Ser(1204)). Two-dimensional structural analysis of ACE showed that the mutated residue was critical for the positioning of a specific loop containing the cleavage site. We therefore propose that a local conformational modification caused by the Pro(1199) --> Leu mutation leads to more accessibility at the stalk region for ACE secretase and is responsible for the enhancement of the cleavage-secretion process. Our results show that different molecular mechanisms are responsible for the common genetic variation of plasma ACE and for its more rare familial elevation.
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Affiliation(s)
- M Eyries
- Institut National de la Santé et de la Recherche Médicale Unit 525, Faculté de médecine Pitié-Salpétrière, 91 Boulevard de l'Hôpital, 75013 Paris, France
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Gerber MJ, Scali JD, Michaud A, Durand MD, Astre CM, Dallongeville J, Romon MM. Profiles of a healthful diet and its relationship to biomarkers in a population sample from Mediterranean southern France. J Am Diet Assoc 2000; 100:1164-71. [PMID: 11043701 DOI: 10.1016/s0002-8223(00)00340-0] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
OBJECTIVES The failure of single-nutrient supplementation to prevent disease in intervention studies underlines the necessity to develop a holistic view of food intake. The objectives of this study were to devise a diet quality index (DQI) and identify biomarkers of multidimensional dietary behavior. DESIGN A nutrition survey was conducted in Mediterranean southern France by means of a food frequency questionnaire. The DQI was based on current dietary recommendations for prevention of diet-related diseases such as cardiovascular disease and some cancers. A second DQI included tobacco use. STATISTICAL ANALYSES performed Spearman rank correlations, cross-classifications and intraclass correlations were computed between the DQI and biomarkers. RESULTS Of the 146 subjects, 10 had a healthful diet and 18 had a poor diet. Erythrocyte omega-3 fatty acids-eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)-beta carotene, and vitamin E concentrations were lower and cholesterol concentrations were higher in the poor diet; the difference was significant for EPA and DHA and borderline significant for vitamin E. Significant correlation was found between the DQI and vitamin E (-0.12), EPA (-0.30), and DHA (-0.28), and beta carotene (-0.17) when tobacco use was considered, but not between the DQI and cholesterol. The correlation coefficient reached 0.58 (P0.01) for a composite index based on all biomarkers except cholesterol. CONCLUSIONS Subjects with a beta carotene levels greater thanl micromol/L, vitamin E greater than 30 micromol/L and EPA greater than 0.65% and DHA greater than 4% of fatty acids in erythrocytes were likely to have a healthful diet. Each biomarker indicated the quality of diet, but correlation was higher with a composite index.
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Affiliation(s)
- M J Gerber
- Groupe d'Epidémiologie Métabolique, Centre de Recherche en Cancérologie, Montpellier, France
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Abstract
The vasopeptidase inhibitor omapatrilat inhibits both neutral endopeptidase and angiotensin-converting enzyme (ACE). The in vitro and in vivo inhibitory potency of omapatrilat and the specific ACE inhibitor fosinopril toward the 2 active sites of ACE (called N- and C-domains) was investigated with the use of 3 substrates: angiotensin I, which is equally cleaved by the 2 ACE domains; hippuryl-histidyl-leucine, specific synthetic substrate of the C-domain in high- salt conditions; and a newly synthesized specific substrate of the N-domain designed by acetylating the lysine residue of AcSDKP. In vitro, omapatrilat was 5 times more potent than fosinoprilat in inhibiting angiotensin I hydrolysis. Omapatrilat inhibited similarly both N- and C-domain hydrolysis, whereas fosinoprilat was slightly more specific for the N-domain. The in vivo selective inhibitory potency of single oral doses of 10 mg omapatrilat and 20 mg fosinopril were investigated in a double-blind, placebo-controlled, cross-over study in 9 mildly sodium-depleted normotensive subjects. In accordance with the in vitro results, fosinopril appeared to be more specific for the N-domain than the C-domain in vivo, since plasma and urine AcSDKP concentrations were significantly higher than those observed with omapatrilat. This study shows that it is possible to assess separately in vitro and in vivo the selectivity of ACE or ACE/neutral endopeptidase inhibitors. A differential selectivity may explain some peculiar properties observed with some ACE inhibitors.
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Affiliation(s)
- M Azizi
- Centre d'Investigations Cliniques 9201, Assistance Publique des H¿opitaux de Paris/INSERM, H¿opital Broussais, Paris, France
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36
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Jafarian-Tehrani M, Listwak S, Barrientos RM, Michaud A, Corvol P, Sternberg EM. Exclusion of angiotensin I-converting enzyme as a candidate gene involved in exudative inflammatory resistance in F344/N rats. Mol Med 2000; 6:319-31. [PMID: 10949912 PMCID: PMC1949946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
BACKGROUND Inbred LEW/N and F344/N rats respectively, are susceptible and relatively resistant to a broad range of inflammatory/autoimmune diseases. We recently identified a quantitative trait locus (QTL) on chromosome 10 that protects the F344/N rat from carrageenan-induced exudation in a dominant fashion. Angiotensin I-converting enzyme (ACE) is one of the candidate genes located in this QTL region that plays an important role in inflammation. MATERIALS AND METHODS RNA was extracted from both LEW/N and F344/N rat strains and used to produce full length cDNA by reverse transcription polymerase chain reaction (RT-PCR). Both strands of the PCR products were entirely sequenced to determine nucleotide differences between strains. ACE activity was measured using the synthetic substrate 3H-hippuryl-glycylglycine. ACE protein levels were determined by Western blot using a specific ACE antibody. ACE kinetic and inhibition studies were performed using specific substrates (Hip-His-Leu and Acetyl-Seryl-Aspartyl-Acetyl-Lysyl-Proline) and inhibitors (lisinopril, captopril and quinaprilat) for each C- and N-terminal active site. Finally, the dose-effects of lisinopril treatment on carrageenen-induced exudate volume and ACE activity was studied. RESULTS In this study, we report for the first time a missense mutation in the coding region of ACE cDNA at 5' 1021 from C to T, resulting in a Leu-341 to Phe substitution, close to the N-domain active site in the F344/N rats. Full characterization of soluble and tissue ACE in both LEW/N and F344/N rat strains showed that soluble ACE levels in serum and exudate were 1.5 fold higher in the F344/N rats than those in LEW/N rats. In addition, the soluble ACE level was inversely correlated with the exudate volume. However, the specific ACE activity and its catalytic properties were identical in both strains. Furthermore, the chronic inhibition of serum and exudate ACE levels by lisinopril treatment did not affect the exudate volume in F344/N rats, indicating that several factors besides ACE were involved in the control of carrageenan-induced exudation. CONCLUSIONS This report describes a complete molecular, biochemical, enzymatic and pharmacologic study of a missense mutation in the ACE cDNA in F344/N rats, that taken together, excludes ACE as a candidate gene involved with resistance to carrageenan-induced exudation in F344/N rats.
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Affiliation(s)
- M Jafarian-Tehrani
- Section on Neuroendocrine Immunology and Behavior, National Institutes of Health, Bethesda, Maryland, USA
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37
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Isaac RE, Michaud A, Keen JN, Williams TA, Coates D, Wetsel WC, Corvol P. Hydrolysis by somatic angiotensin-I converting enzyme of basic dipeptides from a cholecystokinin/gastrin and a LH-RH peptide extended at the C-terminus with gly-Arg/Lys-arg, but not from diarginyl insulin. Eur J Biochem 1999; 262:569-74. [PMID: 10336644 DOI: 10.1046/j.1432-1327.1999.00419.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Endoproteolytic cleavage of protein prohormones often generates intermediates extended at the C-terminus by Arg-Arg or Lys-Arg, the removal of which by a carboxypeptidase (CPE) is normally an important step in the maturation of many peptide hormones. Recent studies in mice that lack CP activity indicate the existence of alternative tissue or plasma enzymes capable of removing C-terminal basic residues from prohormone intermediates. Using inhibitors of angiotensin I-converting enzyme (ACE) and CP, we show that both these enzymes in mouse serum can remove the basic amino acids from the C-terminus of CCK5-GRR and LH-RH-GKR, but only CP is responsible for converting diarginyl insulin to insulin. ACE activity removes C-terminal dipeptides to generate the Gly-extended peptides, whereas CP hydrolysis gives rise to CCK5-GR and LH-RH-GK, both of which are susceptible to the dipeptidyl carboxypeptidase activity of ACE. Somatic ACE has two similar protein domains (the N-domain and the C-domain), each with an active site that can display different substrate specificities. CCK5-GRR is a high-affinity substrate for both the N-domain and C-domain active sites of human sACE (Km of 9.4 microm and 9.0 microm, respectively) with the N-domain showing greater efficiency (kcat : Km ratio of 2.6 in favour of the N-domain). We conclude that somatic forms of ACE should be considered as alternatives to CPs for the removal of basic residues from some Arg/Lys-extended peptides.
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Affiliation(s)
- R E Isaac
- School of Biology, University of Leeds, UK.
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Junot C, Menard J, Gonzales MF, Michaud A, Corvol P, Ezan E. In vivo assessment of captopril selectivity of angiotensin I-converting enzyme inhibition: differential inhibition of acetyl-ser-asp-lys-pro and angiotensin I hydrolysis. J Pharmacol Exp Ther 1999; 289:1257-61. [PMID: 10336514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
Angiotensin I-converting enzyme (ACE) is a zinc metallopeptidase that plays a major role in blood pressure regulation. The demonstration that the hemoregulatory peptide acetyl-Ser-Asp-Lys-Pro (AcSDKP) is a natural and specific substrate of the N-active site of ACE suggests that this enzyme may have a new physiological role such as the modulation of hematopoietic stem cells. In vitro studies have shown that ACE inhibitors displayed various potencies in inhibiting the degradation of different natural or synthetic substrates of ACE, among which captopril inhibits AcSDKP hydrolysis more potently than angiotensin I hydrolysis. To look for this selectivity in vivo, we investigated the pharmacodynamic effect of increasing doses of captopril (0.01-10 mg/kg) during the 90 min after i.v. administration to spontaneously hypertensive rats. Plasma and urinary AcSDKP levels were measured. The renin-angiotensin system was evaluated by measurements of ACE activity in plasma samples, using the synthetic substrate Hip-His-Leu, by determinations of plasma renin concentrations and measurements of arterial blood pressure. The results showed that captopril (0.01-0.3 mg/kg) selectively inhibited AcSDKP hydrolysis, with limited effects on the renin-angiotensin system. AcSDKP levels in plasma and urine rose to a plateau 4 times the basal level for doses more than 0.3 mg/kg. All of the parameters reflecting the renin-angiotensin system were significantly affected at doses of 1 and 10 mg/kg. The present study therefore confirms that captopril can be used to protect hematopoietic stem cells during antitumor chemotherapy while having only a limited effect on cardiovascular homeostasis.
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Affiliation(s)
- C Junot
- Commissariat à l'Energie Atomique, Service de Pharmacologie et d'Immunologie, Saclay, Gif-sur-Yvette, France
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Dive V, Cotton J, Yiotakis A, Michaud A, Vassiliou S, Jiracek J, Vazeux G, Chauvet MT, Cuniasse P, Corvol P. RXP 407, a phosphinic peptide, is a potent inhibitor of angiotensin I converting enzyme able to differentiate between its two active sites. Proc Natl Acad Sci U S A 1999; 96:4330-5. [PMID: 10200262 PMCID: PMC16332 DOI: 10.1073/pnas.96.8.4330] [Citation(s) in RCA: 138] [Impact Index Per Article: 5.5] [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] Open
Abstract
The human somatic angiotensin converting enzyme (ACE) contains two homologous domains, each bearing a zinc-dependent active site. All of the synthetic inhibitors of this enzyme used in clinical applications interact with these two active sites to a similar extent. Recently, several lines of evidence have suggested that the N-terminal active site of ACE might be involved in specific hydrolysis of some important physiological substrates, like Acetyl-Seryl-Aspartyl-Lysyl-Proline, a negative regulator of hematopoietic stem cell differentiation and proliferation. These findings have stimulated studies aimed at identifying new ACE inhibitors able to block only one of the two active sites of this enzyme. By screening phosphinic peptide libraries, we discovered a phosphinic peptide Ac-Asp-(L)Phepsi(PO2-CH2)(L)Ala-Ala-NH2, called RXP 407, which is able to differentiate the two ACE active sites, with a dissociation constant three orders of magnitude lower for the N-domain of the enzyme. The usefulness of a combinatorial chemistry approach to develop new lead structures is underscored by the unusual chemical structure of RXP 407, as compared with classical ACE inhibitors. As a highly potent and selective inhibitor of the N-terminal active site of wild ACE (Ki = 12 nM), RXP 407, which is metabolically stable in vivo, may lead to a new generation of ACE inhibitors able to block in vivo only a subset of the different functions regulated by ACE.
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Affiliation(s)
- V Dive
- Departement d'Etudes et d'Ingéniérie des Protéines, Commissariat à l'Energie Atomique, CE-Saclay, 91191 Gif-Sur-Yvette, France.
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40
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Michaud A, Chauvet MT, Corvol P. N-domain selectivity of angiotensin I-converting enzyme as assessed by structure-function studies of its highly selective substrate, N-acetyl-seryl-aspartyl-lysyl-proline. Biochem Pharmacol 1999; 57:611-8. [PMID: 10037445 DOI: 10.1016/s0006-2952(98)00336-0] [Citation(s) in RCA: 12] [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: 11/16/2022]
Abstract
The physiological functions of angiotensin I-converting enzyme (ACE) are not limited to its cardiovascular role. ACE constantly degrades N-acetyl-seryl-aspartyl-lysyl-proline (AcSDKP), a natural circulating regulator of the hematopoietic stem cell proliferation, and thereby may be involved in hematopoietic stem cell regulation. AcSDKP is hydrolyzed 50-fold faster by the N-domain active site compared to the C-domain active site. The aim of the present study was to investigate which aminoacid residues from AcSDKP are required to ensure N-domain specificity. Several peptides were designed by progressively increasing the length of the peptidic chain from a tripeptide to a pentapeptide. Kinetic studies of the wild-type ACE and of the two ACE mutants containing a single active domain (N- or C-domain) were performed using Bz (benzoyl) Asp-Lys-Pro, benzoyl-glycyl (Bz-Gly)-Asp-Lys-Pro, and Bz-Gly-Ser-Asp-Lys-Pro (with its intermediate product Bz-Gly-Ser-Asp) as substrates. The unexpected importance of an aspartic acid in the P1 position was discovered, as well as the interaction of the P2 and P3 positions in the substrate to increase or decrease N-domain specificity. Substrates longer than five residues may involve interdependence between subsites. Finally, the discovery of highly specific and novel N-domain substrates cannot be predicted from single subsite mapping, but may require other approaches such as combinatorial peptide libraries.
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Affiliation(s)
- A Michaud
- Institut National de la Sante et de la Recherche Medicale, Unite 36, College de France, Paris
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41
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Houard X, Williams TA, Michaud A, Dani P, Isaac RE, Shirras AD, Coates D, Corvol P. The Drosophila melanogaster-related angiotensin-I-converting enzymes Acer and Ance--distinct enzymic characteristics and alternative expression during pupal development. Eur J Biochem 1998; 257:599-606. [PMID: 9839949 DOI: 10.1046/j.1432-1327.1998.2570599.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Drosophila melanogaster express two distinct angiotensin-I-converting enzymes (ACEs) called Ance and Acer, which display a high level of primary structure similarity. We have expressed Acer in the yeast Pichia pastoris and purified the recombinant enzyme with a view to developing biochemical tools to distinguish between Acer and Ance. Purified Acer and Ance expressed in yeast were used to raise anti-Acer Ig and anti-Ance Ig that specifically cross-reacted with the respective enzyme on immunoblotting, but did not act as specific inhibitors. Acer cleaves the C-terminal dipeptides from benzoylglycyl-histidyl-leucine and [Leu5]enkephalin, and Acer and Ance are both able to act as endopeptidases, releasing the C-terminal dipeptideamide from [Leu5]enkephalinamide. However, Acer hydrolyses this substrate at a slightly faster rate than [Leu5]enkephalin, whereas Ance hydrolyses the peptide with a free C-terminus with a kcat 15-fold higher than [Leu5]enkephalinamide. In addition, Acer did not cleave angiotensin I. In contrast, Ance hydrolysed 25% of this substrate at an 8-fold lower enzyme concentration. Furthermore, Acer did not hydrolyse the synthetic substrates Phe-Ser-Pro-Arg-Leu-Gly-Arg-Arg and Phe-Ser-Pro-Arg-Leu-Gly-Lys-Arg, two partially processed putative locustamyotropin precursors, under conditions where Ance produced 82% substrate hydrolysis. Acer was inhibited by captopril, trandolaprilat and enalaprilat, with apparent Ki values in the nanomolar range, whereas lisinopril and fosinoprilat were less potent. We show that the two Drosophila ACEs are alternatively expressed in stages P1 (white puparium)-P15 (eclosion) of pupal development; Ance is expressed predominantly during stages P4-P7, whereas the ACE activity expressed during stages P9-P12 is mainly due to Acer suggesting different roles for the two enzymes during pupal development.
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Affiliation(s)
- X Houard
- INSERM U36, Collège de France, Paris
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42
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Michaud A, Williams TA, Chauvet MT, Corvol P. Substrate dependence of angiotensin I-converting enzyme inhibition: captopril displays a partial selectivity for inhibition of N-acetyl-seryl-aspartyl-lysyl-proline hydrolysis compared with that of angiotensin I. Mol Pharmacol 1997; 51:1070-6. [PMID: 9187274 DOI: 10.1124/mol.51.6.1070] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Angiotensin I-converting enzyme (ACE) is composed of two highly similar domains (referred to here as the N and C domains) that play a central role in blood pressure regulation; ACE inhibitors are widely used in the treatment of hypertension. However, the negative regulator of hematopoiesis, N-acetyl-seryl-aspartyl-lysyl-prolyl (AcSDKP), is a specific substrate of the N domain-active site; thus, in addition to the cardiovascular function of ACE, the enzyme may be involved in hematopoietic stem cell regulation, raising the interest of designing N domain-specific ACE inhibitors. We analyzed the inhibition of angiotensin I and AcSDKP hydrolysis as well as that of three synthetic ACE substrates by wild-type ACE and the N and C domains by using a range of specific ACE inhibitors. We demonstrate that captopril, lisinopril, and fosinoprilat are potent inhibitors of AcSDKP hydrolysis by wild-type ACE, with K(i) values in the subnanomolar range. However, of the inhibitors tested, captopril is the only compound able to differentiate to some degree between AcSDKP and angiotensin I inhibition of hydrolysis by wild-type ACE: the K(i) value with AcSDKP as substrate was 16-fold lower than that with angiotensin I as substrate. This raises the possibility of using captopril to enhance plasma AcSDKP levels with the aim of normal hematopoeitic stem cell protection during chemotherapy and a limited effect on the cardiovascular function of ACE.
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Affiliation(s)
- A Michaud
- Institut National de la Santé et de la Recherche Médicale Unité 36, Collège de France, Paris
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Abstract
Angiotensin I-converting enzyme (ACE) is a type I transmembrane protein composed of two domains (N and C domains) which undergoes a post-translational proteolytic cleavage in mammalian cells to release the soluble ectodomain. The protease involved in ACE cleavage-secretion (ACE-secretase) is not well characterised and eludes isolation: the presence of a yeast homologue, thus more amenable to genetic manipulation, would facilitate its identification. We have expressed a secreted form of the ACE C domain, lacking the C-terminal membrane anchor (C domain(deltaCOOH)), and the membrane-anchored C domain (C domain) in the yeast Pichia pastoris by fusion to prepro-alpha-factor. Immunofluorescent labelling localises the ACE C domain to the periphery of yeast cells but not C domain(deltaCOOH), however, expression of both C domain and C domain(deltaCOOH) produced soluble enzymes in the culture medium. Immunocharacterisation of the two soluble forms of the C domain indicates a proteolytic cleavage of the membrane-bound C domain to produce the soluble counterpart. Thus ACE undergoes a proteolytic cleavage in yeast.
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Williams TA, Michaud A, Houard X, Chauvet MT, Soubrier F, Corvol P. Drosophila melanogaster angiotensin I-converting enzyme expressed in Pichia pastoris resembles the C domain of the mammalian homologue and does not require glycosylation for secretion and enzymic activity. Biochem J 1996; 318 ( Pt 1):125-31. [PMID: 8761461 PMCID: PMC1217597 DOI: 10.1042/bj3180125] [Citation(s) in RCA: 59] [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: 02/02/2023]
Abstract
Drosophila melanogaster angiotensin I-converting enzyme (AnCE) is a secreted single-domain homologue of mammalian angiotensin I-converting enzyme (ACE) which comprises two domains (N and C domains). In order to characterize in detail the enzymic properties of AnCE and to study the influence of glycosylation on the secretion and enzymic activity of this enzyme, we overexpressed AnCE (expression level, 160 mg/l) and an unglycosylated mutant (expression level, 43 mg/l) in the yeast Pichia pastoris. The recombinant enzyme was apparently homogeneous on SDS/PAGE without purification and partial deglycosylation demonstrated that all three potential sites for N-linked glycosylation were occupied by oligosaccharide chains. Each N-glycosylation sequence (Asn-Xaa-Ser/Thr) was disrupted by substituting a glutamine for the asparagine residue at amino acid positions 53, 196 and 311 by site-directed mutagenesis to produce a single mutant. Expression of the unglycosylated mutant in Pichia produced a secreted catalytically active enzyme (AnCE delta CHO). This mutant displayed unaltered kinetics for the hydrolyses of hippuryl-His-Leu, angiotensin 1 and N-acetyl-Ser-Asp-Lys-Pro (AcSDKP) and was equally sensitive to ACE inhibitors compared with wild-type AnCE. However, AnCE delta CHO was less stable, displaying a half-life of 4.94 h at 37 degrees C, compared with AnCE which retained full activity under the same conditions. Two catalytic criteria demonstrate the functional resemblance of AnCE with the human ACE C domain: first, the kcat/Km of AcSDKP hydrolysis and secondly, the kcat/Km and optimal chloride concentration for hippuryl-His-Leu hydrolysis. A range of ACE inhibitors were far less potent towards AnCE compared with the human ACE domains, except for captopril which suggests an alternative structure in AnCE corresponding to the region of the S1 subsite in the human ACE active sites.
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Boiron D, Michaud A, Lemonde P, Castin Y, Salomon C, Weyers S, Szymaniec K, Cognet L, Clairon A. Laser cooling of cesium atoms in gray optical molasses down to 1.1 microK. Phys Rev A 1996; 53:R3734-R3737. [PMID: 9913455 DOI: 10.1103/physreva.53.r3734] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Beldent V, Michaud A, Bonnefoy C, Chauvet MT, Corvol P. Cell surface localization of proteolysis of human endothelial angiotensin I-converting enzyme. Effect of the amino-terminal domain in the solubilization process. J Biol Chem 1995; 270:28962-9. [PMID: 7499427 DOI: 10.1074/jbc.270.48.28962] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Angiotensin-converting enzyme (ACE) belongs to the type I class of ectoproteins and is solubilized by Chinese hamster ovary cells transfected with the full-length human ACE cDNA. ACE release in Chinese hamster ovary cells involves a proteolytic cleavage occurring in the carboxyl-terminal region, between Arg-1137 and Leu-1138. The subcellular localization of ACE proteolysis was established by pulse-chase experiments, cell surface immunolabeling, and biotinylation of radiolabeled mature proteins. The proteolysis of ACE takes place primarily at the plasma membrane. The solubilization of ACE is less than 2% within 1 h, is increased 2.4-fold by phorbol esters, but is not influenced by ionophores. An ACE mutant lacking the transmembrane domain and the cytosolic part (ACE delta COOH), is secreted at a faster rate without a carboxyl-terminal cleavage, and phorbol esters or ionophores have no effect on its rate of production in the medium. Therefore, the proteolysis of ACE is dependent on the presence of the membrane anchor and suggests that the secretase(s) involved is also membrane-associated. An ACE mutant lacking the amino-terminal domain (ACECF) is secreted 10-fold faster compared with wild-type ACE. The solubilization of ACECF occurs at the plasma membrane and is stimulated 2.7-fold by phorbol esters, and the cleavage site is localized between Arg-1227 and Val-1228. The amino-terminal domain of ACE slows down the proteolysis and seems to act as a "conformational inhibitor" of the proteolytic process, possibly via interactions with the "stalk" of ACE and the secretase(s) itself.
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Affiliation(s)
- V Beldent
- Institut National de la Santé et de la Recherche Médical Unit 36-Collège de France-3, Paris, France
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Corvol P, Michaud A, Soubrier F, Williams TA. Recent advances in knowledge of the structure and function of the angiotensin I converting enzyme. J Hypertens Suppl 1995; 13:S3-10. [PMID: 8592248 DOI: 10.1097/00004872-199509003-00002] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
AIM To review the structure and function of the angiotensin I converting enzyme (ACE), focusing on recent results from studies using a wide range of molecular biological techniques. ACE STRUCTURE AND FUNCTION ACE is an ectoenzyme expressed as two isoenzymes in mammals, a larger somatic form found in endothelial, epithelial and neuronal tissues and a smaller form in germinal tissues. Both forms have similar enzymatic activities but differ in size and immunological properties. The somatic form of ACE is composed of two highly homologous domains (amino and carboxyl domains) while the germinal form contains only one domain. Somatic ACE has two functional catalytic sites, both dependent on a zinc cofactor. Each ACE domain has also been shown to interact differently with competitive inhibitors. MECHANISM OF ACE ANCHORAGE AND SOLUBILIZATION The mechanism for anchoring ACE to the cell membrane has also been reported, and the solubilization step outlined. The relationship between the membrane-bound and soluble forms has been investigated, and the physiological relevance of this mechanism discussed. GENETIC STRUCTURE The structure of the ACE gene has been determined and the distribution in cells and different tissues has been reported in various studies. CONCLUSION All results have indicated that there are important functional and structural differences between the two domains, but at present ACE cannot be considered a true bifunctional enzyme, even though an exclusive substrate has been identified for the amino domain.
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Affiliation(s)
- P Corvol
- Laboratory of Experimental Medicine, INSERM U36, Collège de France, Paris
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Rousseau A, Michaud A, Chauvet MT, Lenfant M, Corvol P. The hemoregulatory peptide N-acetyl-Ser-Asp-Lys-Pro is a natural and specific substrate of the N-terminal active site of human angiotensin-converting enzyme. J Biol Chem 1995; 270:3656-61. [PMID: 7876104 DOI: 10.1074/jbc.270.8.3656] [Citation(s) in RCA: 247] [Impact Index Per Article: 8.5] [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: 01/27/2023] Open
Abstract
Angiotensin I-converting enzyme (ACE) is a zinc-dipeptidyl carboxypeptidase, which contains two similar domains, each possessing a functional active site. Respective involvement of each active site in the degradation of the circulating peptide N-acetyl-seryl-aspartyl-lysyl-proline (AcSDKP), a negative regulator of hematopoietic stem cell proliferation, was studied by using wild-type recombinant ACE and two full-length mutants containing a single functional site. Both the N- and C-active sites of ACE exhibit dipeptidyl activity toward AcSDKP, with Km values of 31 and 39 microM, respectively. However, the N-active site hydrolyzes the peptide 50 times faster compared with the C-active site, with kcat/Km values of 0.5 and 0.01 microM-1.s-1, respectively. The predominant role of the N-active site in AcSDKP hydrolysis was confirmed by the inhibition of hydrolysis using a monoclonal antibody specifically directed against the N-active site. The N-domain specificity for AcSDKP will aid the identification of specific inhibitors for this domain. This is the first report of a highly specific substrate for the N-active site of ACE, with kinetic constants in the range of physiological substrates, suggesting that ACE might be involved via its N-terminal active site in the in vivo regulation of the local concentration of this hemoregulatory peptide.
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Affiliation(s)
- A Rousseau
- Centre National de la Recherche Scientifique, Institut de Chimie des Substances Naturelles, Gif-Yvette, France
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Beldent V, Michaud A, Wei L, Chauvet MT, Corvol P. Proteolytic release of human angiotensin-converting enzyme. Localization of the cleavage site. J Biol Chem 1993; 268:26428-34. [PMID: 8253769] [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: 01/29/2023] Open
Abstract
Angiotensin-converting enzyme (EC 3.4.15.1, ACE) is a transmembrane protein with a short carboxyl-terminal cytoplasmic domain, a 17-amino acid hydrophobic anchor domain, and a large N-terminal extracellular region containing two catalytically homologous domains. An active soluble form of ACE circulates in human plasma and is produced in culture medium of Chinese hamster ovary (CHO) cells transfected with the full-length human ACE cDNA. The mechanism of ACE release in CHO cells involves a post-translational proteolytic cleavage occurring in the carboxyl-terminal region. The carboxyl terminus of the secreted recombinant ACE, AGQR, was established by carboxyl-terminal microsequencing and corresponds to a cleavage site between Arg-1137 and Leu-1138. Two independent studies confirmed this proposed cleavage site: amino acid analysis of a carboxyl-terminal peptide derived from soluble ACE and immunocharacterization of membrane-bound and soluble ACE with antibodies raised against three peptides located along the carboxyl-terminal ACE sequence. In order to assess the importance of Arg-1137, this amino acid was mutated to a glutamine residue. This mutation did not prevent the secretion of ACE, suggesting that the solubilizing enzyme can accommodate this change or can use an alternative cleavage site. Finally, the production of soluble ACE in CHO cells appears to be proportional to the level of cellular ACE, implying that the solubilizing enzyme is not a limiting factor. In addition, the carboxyl-terminal sequence of the human plasma ACE was identified as AGQR, thus supporting the fact that a similar mechanism could operate in human vascular cells.
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Affiliation(s)
- V Beldent
- Institut National de la Santé et de la Recherche Médicale, Unit 36, Collège de France, Paris
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