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Dumont Y, Yatat-Djeumen IV. About contamination by sterile females and residual male fertility on the effectiveness of the sterile insect technique. Impact on disease vector control and disease control. Math Biosci 2024; 370:109165. [PMID: 38387836 DOI: 10.1016/j.mbs.2024.109165] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 11/19/2023] [Accepted: 02/13/2024] [Indexed: 02/24/2024]
Abstract
The sterile insect technique (SIT) is a technique to control pests and vectors of diseases by releasing mainly sterile males. Several challenges need to be solved before large-scale field application in order to guarantee its success. In this paper we intend to focus on two important issues: residual fertility in released (sterile) males and contamination of each release by sterile females. Indeed, sterile males are never 100% sterile, that is there is always a small proportion, ɛ, of fertile males (sperm of) within the sterile males population. Among the sterile insects that are released, a certain proportion, ϵF, of them are sterile females due to imperfect mechanical sex-separation technique. This can be particularly problematic when arthropod viruses are circulating, because mosquito females, even sterile, are vectors of diseases. Various upper bound values are given in the entomological literature for ϵF and ɛ without clear explanations. In this work, we aim to show that these values are related to the biological parameters of the targeted vector, the sterile insects release rate, and the epidemiological parameters of a vector-borne disease, like Dengue. We extend results studied separately in Aronna and Dumont (2020), Dumont and Yatat-Djeumen (2022). To study the impact of both issues, we develop and study a SIT-entomological-epidemiological mathematical model, with application to Dengue. Qualitative analysis of the model is carried out to highlight threshold values that shape the overall dynamics of the system. We show that vector elimination is possible only when Nɛ<1, where N is the basic-offspring number related to the targeted wild population. To ensure the success of SIT control, we recommend that the issue of residual fertility be addressed as a priority and then that contamination by sterile females be minimized with each release.
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Affiliation(s)
- Y Dumont
- CIRAD, Umr AMAP, Pôle de Protection des Plantes, F-97410 Saint Pierre, France; AMAP, Univ Montpellier, CIRAD, CNRS, INRA, IRD, Montpellier, France; University of Pretoria, Department of Mathematics and Applied Mathematics, Pretoria, South Africa.
| | - I V Yatat-Djeumen
- CIRAD, Umr AMAP, F-34398 Montpellier, France; University of Yaoundé I, National Advanced School of Engineering of Yaoundé, Department of Mathematics and Physics, Yaoundé, Cameroon; UMI 209 IRD/UPMC UMMISCO, Bondy, France
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Mohamed HS, Galal L, Hayer J, Benavides JA, Bañuls AL, Dupont C, Conquet G, Carrière C, Dumont Y, Didelot MN, Michon AL, Jean-Pierre H, Aboubaker MH, Godreuil S. Genomic epidemiology of carbapenemase-producing Gram-negative bacteria at the human-animal-environment interface in Djibouti city, Djibouti. Sci Total Environ 2023; 905:167160. [PMID: 37730061 DOI: 10.1016/j.scitotenv.2023.167160] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 09/14/2023] [Accepted: 09/15/2023] [Indexed: 09/22/2023]
Abstract
The emergence of carbapenem resistance is a major public health threat in sub-Saharan Africa but remains poorly understood, particularly at the human-animal-environment interface. This study provides the first One Health-based study on the epidemiology of Carbapenemase-Producing Gram-Negative Bacteria (CP-GNB) in Djibouti City, Djibouti, East Africa. In total, 800 community urine samples and 500 hospital specimens from humans, 270 livestock fecal samples, 60 fish samples, and 20 water samples were collected and tested for carbapenem resistance. The overall estimated CP-GNB prevalence was 1.9 % (32/1650 samples) and specifically concerned 0.3 % of community urine samples, 2.8 % of clinical specimens, 2.6 % of livestock fecal samples, 11.7 % of fish samples, and 10 % of water samples. The 32 CP-GNB included 19 Escherichia coli, seven Acinetobacter baumannii, five Klebsiella pneumoniae, and one Proteus mirabilis isolate. Short-read (Illumina) and long-read (Nanopore) genome sequencing revealed that carbapenem resistance was mainly associated with chromosomal carriage of blaNDM-1, blaOXA-23, blaOXA-48, blaOXA-66, and blaOXA-69 in A. baumannii, and with plasmid carriage in Enterobacterales (blaNDM-1 and blaOXA-181 in E. coli, blaNDM-1, blaNDM-5 and blaOXA-48 in K. pneumoniae, and blaNDM-1 in P. mirabilis). Moreover, 17/32 CP-GNB isolates belonged to three epidemic clones: (1) A. baumannii sequence type (ST) 1697,2535 that showed a distribution pattern consistent with intra- and inter-hospital dissemination; (2) E. coli ST10 that circulated at the human-animal-environment interface; and (3) K. pneumoniae ST147 that circulated at the human-environment interface. Horizontal exchanges probably contributed to carbapenem resistance dissemination in the city, especially the blaOXA-181-carrying ColKP3-IncX3 hybrid plasmid that was found in E. coli isolates belonging to different STs. Our study highlights that despite a relatively low CP-GNB prevalence in Djibouti City, plasmids harboring carbapenem resistance circulate in humans, animals and environment. Our findings stress the need to implement preventive and control measures for reducing the circulation of this potentially emerging public health threat.
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Affiliation(s)
- Hasna Saïd Mohamed
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France; Hôpital Général Peltier de Djibouti, Djibouti ville, Djibouti; Laboratoire de Biologie Médicale de la Mer Rouge, Djibouti City, Djibouti
| | - Lokman Galal
- UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France.
| | - Juliette Hayer
- UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France
| | - Julio A Benavides
- UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France; Doctorado en Medicina de la Conservación y Centro de Investigación para la Sustentabilidad, Facultad de Ciencias de la Vida, Universidad Andrés Bello, República 440, Santiago, Chile
| | - Anne-Laure Bañuls
- UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France; LMI DRISA, Montpellier, France
| | - Chloé Dupont
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | - Guilhem Conquet
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France
| | - Christian Carrière
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France
| | - Yann Dumont
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France
| | - Marie-Noëlle Didelot
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France
| | - Anne-Laure Michon
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France
| | - Hélène Jean-Pierre
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France
| | - Mohamed Houmed Aboubaker
- Laboratoire de Biologie Médicale de la Mer Rouge, Djibouti City, Djibouti; Laboratoire de la Caisse Nationale de Sécurité Sociale, Djibouti City 696, Djibouti
| | - Sylvain Godreuil
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; UMR MIVEGEC, Université de Montpellier, IRD, CNRS, Montpellier, France; Jeune Equipe Associée à l'IRD (JEAI), FASORAM, Montpellier, France
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Dikoumba AC, Onanga R, Jean-Pierre H, Didelot MN, Dumont Y, Ouedraogo AS, Ngoungou EB, Godreuil S. Prevalence and Phenotypic and Molecular Characterization of Carbapenemase-Producing Gram-Negative Bacteria in Gabon. Am J Trop Med Hyg 2023; 108:268-274. [PMID: 36535247 PMCID: PMC9896342 DOI: 10.4269/ajtmh.22-0168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 09/05/2022] [Indexed: 12/23/2022] Open
Abstract
Data collection and monitoring of carbapenemase-producing (CP) Gram-negative bacteria (GNB) are often limited. This study determined CP-GNB prevalence in Gabon and the genetic origins of the resistance genes. From January 2016 to March 2018, 869 clinically significant GNB isolates from inpatients and outpatients, and 19 fecal samples (inpatients) were analyzed in the main hospitals of Gabon. Fecal samples were screened using ChromID® CARBA SMART selective chromogenic medium biplates. Species were identified by matrix-assisted laser desorption ionization-time of flight mass spectrometry. Antibiotic susceptibility was tested using the disk diffusion method on Müller-Hinton agar, and resistance genes were assessed by multiplex polymerase chain reaction and sequencing. Overall, 1.61% of clinical isolates (14 of 869) and 5.26% of fecal samples (1 of 19) were CP-GNB. The CP-GNB rate was higher among inpatients (2.98%) than outpatients (0.33%), in intensive care units (28.57%, 4 of 14), and in urine samples (35.71%, 5 of 14). The most common CP-GNB were Klebsiella pneumoniae (53.33%) and Acinetobacter baumannii (26.67%). blaOXA-48 was the predominant carbapenemase-encoding gene (40%), followed by blaNDM-5 (33.33%). The A. baumannii multilocus sequence types ST2 and ST78, Enterobacter cloacae ST78, Escherichia coli ST2, and K. pneumonia ST48 and ST147 were found. These data indicate that CP bacteria are present in clinical and carriage samples. Preventive measures are needed to avoid the spread of resistance genes.
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Affiliation(s)
- Annicet-Clotaire Dikoumba
- Hôpital d’Instruction des Armées Omar Bongo Ondimba, Libreville, Gabon;,Centre Interdisciplinaire de Recherches Médicales de Franceville, Franceville, Gabon;,Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France;,Address correspondence to Annicet-Clotaire Dikoumba, Hôpital d’Instruction des Armées Omar Bongo Ondimba, B.P. 7785 Libreville, Gabon. E-mail:
| | - Richard Onanga
- Centre Interdisciplinaire de Recherches Médicales de Franceville, Franceville, Gabon
| | - Hélène Jean-Pierre
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France;,Maladies Infectieuses et Vecteurs: Ecologie, Génétique, evolution et Contrôle, Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Marie-Noelle Didelot
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France;,Maladies Infectieuses et Vecteurs: Ecologie, Génétique, evolution et Contrôle, Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Yann Dumont
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France;,Maladies Infectieuses et Vecteurs: Ecologie, Génétique, evolution et Contrôle, Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France
| | - Abdoul-Salam Ouedraogo
- Department of Medical Bacteriology and Virology, National Reference Laboratory for Antimicrobial Resistance, University Hospital Centre Sanou Sourou, Bobo Dioulasso, Burkina;,Jeune Equipe Associée à Institut de Recherche pour le Développement, Résistance aux Antimicrobiens au Burkina Faso, Montpellier, France
| | - Edgard-Brice Ngoungou
- Département d’Epidémiologie, Biostatistiques et Informatique Médicale/Unité de Recherche en Epidémiologie des Maladies Chroniques et Santé Environnement, Faculté de Médecine, Université des Sciences de la Santé, Libreville, Gabon
| | - Sylvain Godreuil
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France;,Maladies Infectieuses et Vecteurs: Ecologie, Génétique, evolution et Contrôle, Institut de Recherche pour le Développement, Centre National de la Recherche Scientifique, Université de Montpellier, Montpellier, France;,Jeune Equipe Associée à Institut de Recherche pour le Développement, Résistance aux Antimicrobiens au Burkina Faso, Montpellier, France
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Mohamed HS, Houmed Aboubaker M, Dumont Y, Didelot MN, Michon AL, Galal L, Jean-Pierre H, Godreuil S. Multidrug-Resistant Enterobacterales in Community-Acquired Urinary Tract Infections in Djibouti, Republic of Djibouti. Antibiotics (Basel) 2022; 11:antibiotics11121740. [PMID: 36551396 PMCID: PMC9774282 DOI: 10.3390/antibiotics11121740] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/28/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022] Open
Abstract
The emergence and spread of multidrug resistant Enterobacterales (MDR-E) are a global public health issue. This problem also concerns urinary tract infections (UTI), which are the second most frequent infections after respiratory infections. The objective of this study was to determine MDR-E frequency and to characterize MDR-E isolates from patients with community-acquired UTIs in Djibouti, Republic of Djibouti. From 800 clinical urinary samples collected at the Mer Rouge Laboratory, Djibouti, from January to July 2019, 142 were identified as Enterobacterales (age range of the 142 patients mean age is 42 years.) Mass spectrometry analysis of these isolates identified 117 Escherichia coli, 14 Klebsiella pneumoniae, 2 Proteus mirabilis, 4 Enterobacter spp., 4 Providencia stuartii and 1 Franconibacter helveticus. Antibiotic susceptibility testing (disk diffusion method) of these 142 isolates detected 68 MDR-E (68/142 = 48%): 65 extended-spectrum bêta lactamase- (ESBL), 2 carbapenemase- (one also ESBL), and 1 cephalosporinase-producer. Multiplex PCR and sequencing showed that the 65 ESBL-producing isolates carried genes encoding CTX-M enzymes (CTX-M-15 in 97% and CTX-M-9 in 3% of isolates). Two isolates harboured a gene encoding the OXA-48-like carbapenemase, and one the gene encoding the AmpC CMY-2 cephalosporinase. Genes implicated in resistance to quinolones (qnrB, aac (6')-Ib-cr, qnrD, oqxA and B) also were detected. Among the E. coli phylogroups, B2 was the most common phylogenetic group (21% of MDR-E isolates and 26% of non-MDR-E isolates), followed by A (14% and 12%), B1 (9% and 7%), D (3% and 3%), F (3% and 3%) and E (2% and 2%). This study highlights the high frequency of ESBL producers and the emergence of carbapenemase-producers among Enterobacterales causing community-acquired UTIs in Djibouti.
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Affiliation(s)
- Hasna Said Mohamed
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, 34295 Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34394 Montpellier, France
- Hospital General Peltier de Djibouti, Djibouti City 2123, Djibouti
- Laboratoire de Biologie Médicale de la Mer Rouge, Djibouti City 1119, Djibouti
- Correspondence: ; Tel.: +253-77-818-524
| | - Mohamed Houmed Aboubaker
- Laboratoire de Biologie Médicale de la Mer Rouge, Djibouti City 1119, Djibouti
- Laboratoire de la Caisse Nationale de Sécurité Sociale, Djibouti City 696, Djibouti
| | - Yann Dumont
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, 34295 Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34394 Montpellier, France
| | - Marie-Noëlle Didelot
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, 34295 Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34394 Montpellier, France
| | - Anne-Laure Michon
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, 34295 Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34394 Montpellier, France
| | - Lokman Galal
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34394 Montpellier, France
| | - Hélène Jean-Pierre
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, 34295 Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34394 Montpellier, France
| | - Sylvain Godreuil
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, 34295 Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, 34394 Montpellier, France
- Jeune Equipe Associée à IRD (JEAI), FASORAM, 34394 Montpellier, France
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Chiron R, Hoefsloot W, Van Ingen J, Marchandin H, Kremer L, Morisse-Pradier H, Charriot J, Mallet JP, herrmann JL, Caimmi D, Moreau J, Dumont Y, Godreuil S, Bergeron A, Drevait M, Bouzat-Rossigneux E, Terrail N, Andrejak C, Veziris N, Grenet D, Coudrat A, Catherinot E. Amikacin Liposomal Inhalation Suspension (ALIS) in the treatment of Mycobacterium abscessus lung infection: a French observational experience. Open Forum Infect Dis 2022; 9:ofac465. [PMID: 36267258 PMCID: PMC9578164 DOI: 10.1093/ofid/ofac465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/08/2022] [Indexed: 11/13/2022] Open
Abstract
Background Mycobacterium abscessus infections remain difficult to manage in both cystic fibrosis (CF) and non-CF patients and reported clinical outcomes are largely unsatisfactory. Clinical trial data are limited and no approved therapies are currently available for the management of M abscessus lung diseases. As an alternative, cohort studies may provide insightful information into the management of M abscessus pulmonary disease. Methods Based on a retrospective observational cohort study, we investigated the safety and efficacy of amikacin liposome inhaled suspension (ALIS) as an adjunct to a standard antibiotic regimen for M abscessus lung infection in both CF and non-CF patients. We also assessed the association of patient drug compliance with culture conversion and clinical outcomes. Results Twenty-six patients had long-term follow-up data available. Culture conversion was achieved in 54% (14/26) of the patients with no difference between CF and non-CF patients after an average treatment duration of 10 months. Patient treatment compliance was significantly better in the converter group compared to nonconverters with an odds ratio of 44.78 associated with good compared to poor patient compliance. Overall, 9 patients (35%) experienced an adverse event that led to treatment discontinuation. Conclusions ALIS appears beneficial in both CF and non-CF populations with M abscessus lung disease.
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Affiliation(s)
- R Chiron
- HydroSciences Montpellier, CNRS, IRD, Univ Montpellier , Montpellier, FR
- University Hospital Centre Montpellier, CF center , Montpellier, FR
| | - W Hoefsloot
- Radboud University Medical Center, Pulmonary Disceases , Postbus 9101, 6500 HB, Nijmegen, NL
| | - J Van Ingen
- Radboud University Medical Centre, Department of Medical Microbiology, Geert Grooteplein Zuid 10 , Nijmegen, NL
| | - H Marchandin
- HydroSciences Montpellier, CNRS, IRD, Univ Montpellier , Montpellier, FR
- University Hospital Centre Nimes, Service de Microbiologie et Hygiène Hospitalière , Nimes, FR
| | - L Kremer
- Institut de Recherche en Infectiologie de Montpellier, INSERM, Centre National de la Recherche Scientifique UMR 9004, Univ Montpellier , Montpellier, FR
- INSERM, Institut de Recherche en Infectiologie de Montpellier , Montpellier, FR
| | | | - J Charriot
- University Hospital Centre Montpellier, Respiratory Diseases Department , Montpellier, FR
- Univ Montpellier, PhyMedExp INSERM U1046 , Montpellier, FR
| | - J P Mallet
- University Hospital Centre Montpellier, Respiratory Diseases Department , Montpellier, FR
| | - J L herrmann
- Université Paris-Saclay, Hopital Raymond Poincaré, GHU-APHP , Paris, FR
- Garches UVSQ, Inserm, Service de Microbiologie, Montigny le Bretonneux , FR
| | - D Caimmi
- University Hospital Centre Montpellier, CF center , Montpellier, FR
| | - J Moreau
- PhyMedExp, INSERM, CNRS , Montpellier, FR
- University Hospital Centre Montpellier, paediatric and respiratory departments, CF center , Montpellier, FR
| | - Y Dumont
- University Hospital Centre Montpellier, Laboratoire de bactériologie, MIVEGEC, IRD-CNRS-UM , Montpellier, FR
| | - S Godreuil
- University Hospital Centre Montpellier, Laboratoire de bactériologie, MIVEGEC, IRD-CNRS-UM , Montpellier, FR
| | - A Bergeron
- AP-HP, Hôpital Saint-Louis, Service de Pneumologie, 1 avenue Claude Vellefaux , Paris, FR
- Université Paris Diderot, Sorbonne Paris Cité, U1153 CRESS, Biostatistics and Clinical Epidemiology research team , Paris, FR
| | - M Drevait
- University Hospital Centre Montpellier, CF center , Montpellier, FR
| | - E Bouzat-Rossigneux
- Centre Hospitalier Universitaire Pointe-à-Pitre Abymes , Pointe-a-Pitre, Guadeloupe, FR
| | - N Terrail
- University Hospital Centre Montpellier, pharmacy department , Montpellier, FR
| | - C Andrejak
- CHU Amiens-Picardie, Respiratory department, Avenue Laënenc , Amiens, FR
- Amiens University, EA 4294 AGIR, Rue des Louvels , Amiens, FR
| | - N Veziris
- APHP, Centre National de Référence des Mycobactéries et de la Résistance des Mycobactéries aux Antituberculeux , Paris, FR
- Sorbonne Universite, Centre d'Immunologie et des Maladies Infectieuses (Cimi-Paris) , UMR 1135, Paris, FR
| | - D Grenet
- Hopital Foch, Pneumologie et Transplantation Pulmonaire , Suresnes, FR
| | - A Coudrat
- University Hospital Centre Montpellier, CF center , Montpellier, FR
| | - E Catherinot
- Hôpital Foch, pneumology department , Suresnes, FR
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Ladeveze M, Dumont Y, Boursier G, Batteux F, Mahe P, Bensimon Borrull A, Sarrabay G, Bollore K, Tuaillon E, Godreuil S, Jeziorski E. Case Report: Persistency Pneumococcal Polysaccharide in Cerebrospinal Fluid During a Post Pneumococcal Chronic Aseptic Meningitis: Coincidental or (Auto-)Inflammatory Embers. Front Pediatr 2022; 10:762457. [PMID: 35223689 PMCID: PMC8864159 DOI: 10.3389/fped.2022.762457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Accepted: 01/10/2022] [Indexed: 11/22/2022] Open
Abstract
We report the case of a 9-months-old boy that has presented a steroid-dependent post-pneumococcal chronic aseptic meningitis was associated with persistence of pneumococcal cell wall components in cerebrospinal fluid during more than 20 months. Suggesting that this antigenic persistence could be involved in post-infectious manifestations through innate immunity response.
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Affiliation(s)
- Manon Ladeveze
- Département Urgences Post-Urgences, CEREMAIA, CHU de Montpellier, Montpellier, France
| | - Yann Dumont
- Laboratoire de Bactériologie, CHU de Montpellier, Montpellier, France
| | - G Boursier
- Laboratoire de Génétique des Maladies Rares et Autoinflammatoires, Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, CEREMAIA, CHU de Montpellier, Univ Montpellier, Montpellier, France
| | - Frederic Batteux
- Plateforme d'ImmunoMonitoring Vaccinal (PIMV), Laboratoire d'Immunologie, Hôpital Cochin, Paris, France
| | - Perrine Mahe
- Département Urgences Post-Urgences, CEREMAIA, CHU de Montpellier, Montpellier, France
| | - Aurelie Bensimon Borrull
- Plateforme d'ImmunoMonitoring Vaccinal (PIMV), Laboratoire d'Immunologie, Hôpital Cochin, Paris, France
| | - Guillaume Sarrabay
- Laboratoire de Génétique des Maladies Rares et Autoinflammatoires, Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, CEREMAIA, CHU de Montpellier, Univ Montpellier, Montpellier, France
| | - Karine Bollore
- Plateforme Exploration de cellules rares en immunologie et infectiologie, CHU de Montpellier, Montpellier, France.,PCCEI, INSERM, Univ Montpellier, Montpellier, France
| | - Edouard Tuaillon
- Plateforme Exploration de cellules rares en immunologie et infectiologie, CHU de Montpellier, Montpellier, France.,PCCEI, INSERM, Univ Montpellier, Montpellier, France.,Laboratoire de virologie, CHU de Montpellier, Montpellier, France
| | - Sylvain Godreuil
- Laboratoire de Bactériologie, CHU de Montpellier, Montpellier, France.,UMR IRD224-CNRS5290-UM MIVEGEC, Univ Montpellier, Montpellier, France
| | - Eric Jeziorski
- Département Urgences Post-Urgences, CEREMAIA, CHU de Montpellier, Montpellier, France.,PCCEI, INSERM, Univ Montpellier, Montpellier, France
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Dumont Y, Yatat-Djeumen IV. Sterile insect technique with accidental releases of sterile females. Impact on mosquito-borne diseases control when viruses are circulating. Math Biosci 2021; 343:108724. [PMID: 34748880 DOI: 10.1016/j.mbs.2021.108724] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 10/18/2021] [Accepted: 10/18/2021] [Indexed: 01/17/2023]
Abstract
The sterile insect technique (SIT) is a technique to control some vectors of diseases by releasing sterile males. However, during these releases, sterilized females can be (accidentally) released and since only females are vectors of diseases, it is important to study their impact when arthropod viruses are circulating. To that aim, we develop and study an entomological-epidemiological model, considering either permanent or periodic releases. Qualitative analyses of the continuous and periodic models are conducted. We highlight a critical sterile males release rate, ΛMcrit, above which the control of wild population is always effective, using massive releases. Estimating the basic reproduction number of the epidemiological model, R02, we show that if it is above a certain threshold, R0,∗2, that depends on the basic offspring number, N, and the release rate of sterile females, the epidemiological risk can only be controlled using (very) massive releases. Otherwise, we can estimate the basic reproduction number of the SIT epidemiological model, R0,SIT2, that shapes the stability property of the (periodic) disease-free equilibrium. We show that it might be possible to take R0,SIT2 below 1 using non-massive, but large enough, releases. However, practically, it seems more efficient to consider massive releases, followed by small releases once the vector population is small enough. In addition to SIT, we also recommend mechanical control, i.e. the reduction of breeding sites, that greatly improves the efficacy of SIT, in terms of duration or size of the releases. Our results reveal that outside an epidemic period, the release of sterile females is not an issue, as long as the sterile males release rate is greater than ΛMcrit. Within an epidemic period, we show that sterile females releases do not really impact the SIT efficiency, as long as the release rate, ΛF, is lower than a critical value, ΛFcrit, that depends on the mosquito and epidemiological threshold parameters, N, and R02. To illustrate numerically our theoretical results, we consider Dengue parameters. We estimate all thresholds and also the effective reproduction number, Reff2, and highlight the importance of early permanent or periodic SIT control to prevent or mitigate the risk of a Dengue epidemic, with and without sterile females releases.
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Affiliation(s)
- Y Dumont
- CIRAD, Umr AMAP, Pôle de Protection des Plantes, F-97410 Saint Pierre, France; AMAP, Univ Montpellier, CIRAD, CNRS, INRA, IRD, Montpellier, France; University of Pretoria, Department of Mathematics and Applied Mathematics, Pretoria, South Africa.
| | - I V Yatat-Djeumen
- University of Yaoundé I, National Advanced School of Engineering of Yaoundé, Department of Mathematics and Physics, Yaoundé, Cameroon; UMI 209 IRD/UPMC UMMISCO, Bondy, France
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Djeumen IY, Dumont Y, Doizy A, Couteron P. A minimalistic model of vegetation physiognomies in the savanna biome. Ecol Modell 2021. [DOI: 10.1016/j.ecolmodel.2020.109381] [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: 10/22/2022]
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Ouchar Mahamat O, Kempf M, Lounnas M, Tidjani A, Hide M, Benavides JA, Carrière C, Bañuls AL, Jean-Pierre H, Ouedraogo AS, Dumont Y, Godreuil S. Epidemiology and prevalence of extended-spectrum β-lactamase- and carbapenemase-producing Enterobacteriaceae in humans, animals and the environment in West and Central Africa. Int J Antimicrob Agents 2020; 57:106203. [PMID: 33075511 DOI: 10.1016/j.ijantimicag.2020.106203] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 04/02/2020] [Revised: 09/29/2020] [Accepted: 10/11/2020] [Indexed: 12/17/2022]
Abstract
Extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBL-E) and carbapenemase-producing Enterobacteriaceae (CPE) are widespread. Here we used the 'One Health' approach to determine knowledge gaps on ESBL-E and CPE in West and Central Africa. We searched all articles on ESBL-E and CPE in these African regions published in PubMed, African Journals Online and Google Scholar from 2000 onwards. Among the 1201 articles retrieved, we selected 165 studies (West Africa, 118; Central Africa, 47) with data from 22 of the 26 West and Central Africa countries. Regarding the settings, 136 articles focused only on humans (carriage and/or infection), 6 articles on humans and animals, 13 on animals, 1 on humans and the environment, 8 on the environment and 1 on humans, animals and environments. ESBL-E prevalence ranged from 11-72% in humans and 7-79% in aquatic environments (wastewater). In animals, ESBL-E prevalence hugely varied: 0% in cattle, 11-36% in chickens, 20% in rats, 21-71% in pigs and 32-75% in dogs. The blaCTX-M-15 gene was the predominant ESBL-encoding gene and was associated with plasmids of incompatibility groups F, H, K, Y, N, I1 and R. CPE were studied only in humans. Class B metallo-β-lactamases (NDM) and class D oxacillinases (OXA-48 and OXA-181) were the most common carbapenemases. Our results show major knowledge gaps, particularly on ESBL and CPE in animals and the environment, that might limit antimicrobial resistance management in these regions. The results also emphasise the urgent need to improve active surveillance programmes in each country and to support antimicrobial stewardship.
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Affiliation(s)
- Oumar Ouchar Mahamat
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France; Service de laboratoire, Hôpital de la Mère et de l'Enfant, N'Djaména, Chad.
| | - Marie Kempf
- CRCINA, INSERM, Université de Nantes, Université d'Angers, Angers, France, and Laboratoire de Bactériologie-Hygiène, Institut de Biologie en Santé - PBH, CHU Angers, Angers, France
| | - Manon Lounnas
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | | | - Mallorie Hide
- MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Julio A Benavides
- Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile; Centro de Investigación para la Sustentabilidad, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Christian Carrière
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Anne-Laure Bañuls
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France; Laboraoire Mixte International, DRISA, IRD, Montpellier, France
| | - Hélène Jean-Pierre
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | | | - Yann Dumont
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Sylvain Godreuil
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France; Laboraoire Mixte International, DRISA, IRD, Montpellier, France
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Ferry A, Plaisant F, Ginevra C, Dumont Y, Grando J, Claris O, Vandenesch F, Butin M. Enterobacter cloacae colonisation and infection in a neonatal intensive care unit: retrospective investigation of preventive measures implemented after a multiclonal outbreak. BMC Infect Dis 2020; 20:682. [PMID: 32942989 PMCID: PMC7500001 DOI: 10.1186/s12879-020-05406-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 09/08/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Enterobacter cloacae species is responsible for nosocomial outbreaks in vulnerable patients in neonatal intensive care units (NICU). The environment can constitute the reservoir and source of infection in NICUs. Herein we report the impact of preventive measures implemented after an Enterobacter cloacae outbreak inside a NICU. METHODS This retrospective study was conducted in one level 3 NICU in Lyon, France, over a 6 year-period (2012-2018). After an outbreak of Enterobacter cloacae infections in hospitalized neonates in 2013, several measures were implemented including intensive biocleaning and education of medical staff. Clinical and microbiological characteristics of infected patients and evolution of colonization/infection with Enterobacter spp. in this NICU were retrieved. Moreover, whole genome sequencing was performed on 6 outbreak strains. RESULTS Enterobacter spp. was isolated in 469 patients and 30 patients developed an infection including 2 meningitis and 12 fatal cases. Preventive measures and education of medical staff were not associated with a significant decrease in patient colonisation but led to a persistent decreased use of cephalosporin in the NICU. Infection strains were genetically diverse, supporting the hypothesis of multiple hygiene defects rather than the diffusion of a single clone. CONCLUSIONS Grouped cases of infections inside one setting are not necessarily related to a single-clone outbreak and could reveal other environmental and organisational problematics. The fight against implementation and transmission of Enterobacter spp. in NICUs remains a major challenge.
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Affiliation(s)
- Alexandrine Ferry
- Hospices Civils de Lyon, Service de Néonatologie et Réanimation Néonatale, Hôpital Femme Mère 59 Boulevard Pinel, 69500, Bron, France
| | - Frank Plaisant
- Hospices Civils de Lyon, Service de Néonatologie et Réanimation Néonatale, Hôpital Femme Mère 59 Boulevard Pinel, 69500, Bron, France
| | - Christophe Ginevra
- Hospices Civils de Lyon, Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Groupement Hospitalier Nord, Lyon, France
| | - Yann Dumont
- Hospices Civils de Lyon, Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Groupement Hospitalier Nord, Lyon, France
| | - Jacqueline Grando
- Hospices Civils de Lyon, Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Groupement Hospitalier Nord, Lyon, France
| | - Olivier Claris
- Hospices Civils de Lyon, Service de Néonatologie et Réanimation Néonatale, Hôpital Femme Mère 59 Boulevard Pinel, 69500, Bron, France.,Université Claude Bernard, 4129, Villeurbanne, EA, France
| | - François Vandenesch
- Hospices Civils de Lyon, Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Groupement Hospitalier Nord, Lyon, France.,CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm U1111; Ecole Normale Supérieure de Lyon; Université Lyon 1; CNRS, UMR5308, Lyon, France
| | - Marine Butin
- Hospices Civils de Lyon, Service de Néonatologie et Réanimation Néonatale, Hôpital Femme Mère 59 Boulevard Pinel, 69500, Bron, France. .,CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm U1111; Ecole Normale Supérieure de Lyon; Université Lyon 1; CNRS, UMR5308, Lyon, France.
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11
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Viala B, Zaidi FZ, Bastide M, Dumont Y, Le Moing V, Jean-Pierre H, Godreuil S. Assessment of theIn VitroActivities of Ceftolozane/Tazobactam and Ceftazidime/Avibactam in a Collection of Beta-Lactam-Resistant Enterobacteriaceae andPseudomonas aeruginosaClinical Isolates at Montpellier University Hospital, France. Microb Drug Resist 2019; 25:1325-1329. [DOI: 10.1089/mdr.2018.0439] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Benjamin Viala
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | - Fatma Zohra Zaidi
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | - Mathilda Bastide
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | - Yann Dumont
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Vincent Le Moing
- Service des Maladies Infectieuses et Tropicales, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | - Hélène Jean-Pierre
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Sylvain Godreuil
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
- MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
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12
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Ouchar Mahamat O, Tidjani A, Lounnas M, Hide M, Benavides J, Somasse C, Ouedraogo AS, Sanou S, Carrière C, Bañuls AL, Jean-Pierre H, Dumont Y, Godreuil S. Fecal carriage of extended-spectrum β-lactamase-producing Enterobacteriaceae in hospital and community settings in Chad. Antimicrob Resist Infect Control 2019; 8:169. [PMID: 31695911 PMCID: PMC6824111 DOI: 10.1186/s13756-019-0626-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 10/15/2019] [Indexed: 11/29/2022] Open
Abstract
Background Fecal carriage of extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBL-PE) remains poorly documented in Africa. The objective of this study was to determine the prevalence of ESBL-PE fecal carriage in Chad. Methods In total, 200 fresh stool samples were collected from 100 healthy community volunteers and 100 hospitalized patients from January to March 2017. After screening using ESBL-selective agar plates and species identification by MALDI-TOF mass spectrometry, antibiotic susceptibility was tested using the disk diffusion method, and ESBL production confirmed with the double-disc synergy test. The different ESBL genes in potential ESBL-producing isolates were detected by PCR and double stranded DNA sequencing. Escherichia coli phylogenetic groups were determined using a PCR-based method. Results ESBL-PE fecal carriage prevalence was 44.5% (51% among hospitalized patients vs 38% among healthy volunteers; p < 0.05). ESBL-producing isolates were mostly Escherichia coli (64/89) and Klebsiella pneumoniae (16/89). PCR and sequencing showed that 98.8% (87/89) of ESBL-PE harbored blaCTX-M genes: blaCTX-M-15 in 94.25% (82/87) and blaCTX-M-14 in 5.75% (5/87). Phylogroup determination by quadruplex PCR indicated that ESBL-producing E. coli isolates belonged to group A (n = 17; 27%), C (n = 17; 27%), B2 (n = 9; 14%), B1 (n = 8; 13%), D (n = 8; 13%), E (n = 1; 1.6%), and F (n = 1; 1.6%). The ST131 clone was identified in 100% (9/9) of E. coli B2 strains. Conclusions The high fecal carriage rate of ESBL-PE associated with CTX-M-15 in hospital and community settings of Chad highlights the risk for resistance transmission between non-pathogenic and pathogenic bacteria.
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Affiliation(s)
- Oumar Ouchar Mahamat
- 1Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.,2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France.,Service de laboratoire Hôpital de la Mère et de l'Enfant, N'Djaména, Chad
| | | | - Manon Lounnas
- 1Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.,2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Mallorie Hide
- 2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Julio Benavides
- 57 Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Calèbe Somasse
- 1Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.,2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Abdoul-Salam Ouedraogo
- Service de bactériologie-virologie, Département des laboratoires, Centre Hospitalier Universitaire Souro Sanou, Bobo Dioulasso, Burkina Faso
| | - Soufiane Sanou
- Service de bactériologie-virologie, Département des laboratoires, Centre Hospitalier Universitaire Souro Sanou, Bobo Dioulasso, Burkina Faso
| | - Christian Carrière
- 1Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.,2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Anne-Laure Bañuls
- 2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France.,7Laboraoire Mixte International, DRISA, IRD, Montpellier, France
| | - Hélène Jean-Pierre
- 1Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.,2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Yann Dumont
- 1Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.,2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Sylvain Godreuil
- 1Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.,2MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France.,7Laboraoire Mixte International, DRISA, IRD, Montpellier, France
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Butin M, Dumont Y, Monteix A, Raphard A, Roques C, Martins Simoes P, Picaud JC, Laurent F. Sources and reservoirs of Staphylococcus capitis NRCS-A inside a NICU. Antimicrob Resist Infect Control 2019; 8:157. [PMID: 31636900 PMCID: PMC6798403 DOI: 10.1186/s13756-019-0616-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 10/01/2019] [Indexed: 12/23/2022] Open
Abstract
Background The methicillin-resistant clone Staphylococcus capitis NRCS-A, involved in sepsis in neonatal intensive care units (NICUs) worldwide, is able to persist and spread in NICUs, suggesting the presence of reservoirs inside each setting. The purpose of the present study was to identify these reservoirs and to investigate the cycle of transmission of NRCS-A in one NICU. Methods In a single institution study, NRCS-A was sought in 106 consecutive vaginal samples of pregnant women to identify a potential source of NRCS-A importation into the NICU. Additionally NICU caregivers and environmental including incubators were tested to identify putative secondary reservoirs. Finally, the efficacy of disinfection procedure in the elimination of NRCS-A from incubators was evaluated. Results No S. capitis was isolated from vaginal samples of pregnant women. Three of the 21 tested caregivers (14%) carried S. capitis on their hands, but none remain positive after a five-day wash-out period outside NICU. Moreover, the clone NRCS-A persisted during six consecutive weeks in the NICU environment, but none of the sampled sites was constantly contaminated. Finally in our before/after disinfection study, all of 16 incubators were colonized before disinfection and 10 (62%) incubators remained colonized with NRCS-A after the disinfection procedure. Conclusions The partial ineffectiveness of incubators’ disinfection procedures is responsible for persistence of NRCS-A inside a NICU, and the passive hand contamination of caregivers could be involved in the inter-patient transmission of S. capitis.
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Affiliation(s)
- Marine Butin
- 1Centre International de Recherche en Infectiologie (CIRI), INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, 46 Allée d'Italie, 69364 Lyon Cedex 07, France.,2Réanimation Néonatale, Hôpital Femme Mère Enfant, Hospices Civils de Lyon, 59 boulevard Pinel, 69500 Bron, France
| | - Yann Dumont
- 3Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Hôpital de la Croix Rousse, Hospices Civils de Lyon, 104 grande rue de la Croix Rousse, 69004 Lyon, France
| | - Alice Monteix
- 3Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Hôpital de la Croix Rousse, Hospices Civils de Lyon, 104 grande rue de la Croix Rousse, 69004 Lyon, France
| | - Aurane Raphard
- 3Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Hôpital de la Croix Rousse, Hospices Civils de Lyon, 104 grande rue de la Croix Rousse, 69004 Lyon, France
| | - Christine Roques
- Laboratoire de Génie Chimique UMR 5503, Université de Toulouse, CNRS, INPT, UPS, Faculté des Sciences Pharmaceutiques, 35 chemin des maraîchers, 31062 Toulouse cedex 4, France
| | - Patricia Martins Simoes
- 1Centre International de Recherche en Infectiologie (CIRI), INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, 46 Allée d'Italie, 69364 Lyon Cedex 07, France.,3Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Hôpital de la Croix Rousse, Hospices Civils de Lyon, 104 grande rue de la Croix Rousse, 69004 Lyon, France
| | - Jean-Charles Picaud
- 5Réanimation Néonatale, Hôpital de la Croix Rousse, Hospices Civils de Lyon, 104 grande rue de la Croix Rousse, 69004 Lyon, France.,6CarMeN, INSERM U1060, INRA U1397, Université de Lyon, 165 Chemin du Grand Revoyet, 69310 Pierre Bénite, France
| | - Frédéric Laurent
- 1Centre International de Recherche en Infectiologie (CIRI), INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, 46 Allée d'Italie, 69364 Lyon Cedex 07, France.,3Institut des Agents Infectieux, Centre National de Référence des Staphylocoques, Hôpital de la Croix Rousse, Hospices Civils de Lyon, 104 grande rue de la Croix Rousse, 69004 Lyon, France.,7Département de Microbiologie et Mycologie, Institut des Sciences Pharmaceutiques et Biologiques de Lyon, Université de Lyon, 6 Avenue Rockefeller, 69008 Lyon, France
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14
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Veloo ACM, Tokman HB, Jean-Pierre H, Dumont Y, Jeverica S, Lienhard R, Novak A, Rodloff A, Rotimi V, Wybo I, Nagy E. Antimicrobial susceptibility profiles of anaerobic bacteria, isolated from human clinical specimens, within different European and surrounding countries. A joint ESGAI study. Anaerobe 2019; 61:102111. [PMID: 31634565 DOI: 10.1016/j.anaerobe.2019.102111] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 10/14/2019] [Accepted: 10/15/2019] [Indexed: 12/26/2022]
Abstract
OBJECTIVES Studies on the antimicrobial susceptibility profile of anaerobic bacteria are underrepresented in the literature. Within this study we aim to give an extensive overview of the differences in antimicrobial susceptibility profiles between different European and surrounding countries. METHODS Minimal inhibitory concentration (MIC) data of different antibiotics were collected from 10 participating laboratories, representing an equal number of countries. All MIC's were determined using Etest, according to the protocol used by the participating laboratory. Anaerobic genera represented by at least 10 clinical isolates were included in the study. RESULTS Each country tested different antibiotics, sometimes depending on the kind of infection and/or the anaerobic species isolated. All countries tested clindamycin and metronidazole. Resistance rates differed remarkably between the different countries. Especially in Kuwait, resistance was high for all tested antibiotics. Unexpected metronidazole resistance was observed for Finegoldia magna isolates, Peptoniphilus isolates and Eggerthella lenta isolates. CONCLUSIONS Due to the extensive differences in antimicrobial susceptibility profile of anaerobic bacteria isolated within different countries, we strongly recommend to perform this kind of study on a regular basis.
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Affiliation(s)
- A C M Veloo
- University of Groningen, University Medical Center Groningen, Department of Medical Microbiology and Infection Prevention, Groningen, the Netherlands.
| | - H Bahar Tokman
- Istanbul University-Cerrahpasa, Cerrahpasa School of Medicine, Department of Medical Microbiology, Istanbul, Turkey
| | - H Jean-Pierre
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - Y Dumont
- Laboratoire de Bactériologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France; MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
| | - S Jeverica
- Institute for Microbiology and Immunology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - R Lienhard
- Analyses et Diagnostics Médicaux (ADMed) Microbiologie, La Chaux-de-Fonds, Switzerland
| | - A Novak
- University Hospital Center of Split, University of Split, School of Medicine, Split, Croatia
| | - A Rodloff
- Institute for Medical Microbiology and Epidemiology of Infectious Diseases, Leipzig University Hospital, Leipzig, Germany
| | - V Rotimi
- Department of Microbiology, Faculty of Medicine, Kuwait University, Kuwait
| | - I Wybo
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - E Nagy
- Institute of Clinical Microbiology, Faculty of Medicine, University of Szeged, Szeged, Hungary
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Larcher R, Lounnas M, Dumont Y, Michon AL, Bonzon L, Chiron R, Carriere C, Klouche K, Godreuil S. Mycobacterium chimaera Pulmonary Disease in Cystic Fibrosis Patients, France, 2010-2017. Emerg Infect Dis 2019; 25:611-613. [PMID: 30789330 PMCID: PMC6390743 DOI: 10.3201/eid2503.181590] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
We report Mycobacterium chimaera pulmonary disease in 4 patients given a diagnosis of cystic fibrosis in a university hospital in Montpellier, France. All patients had M. chimaera–positive expectorated sputum specimens, clinical symptoms of pulmonary exacerbation, or a decrease in spirometry test results that improved after specific treatment.
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Ciatto G, Aubert N, Lecroard M, Engblom C, Fontaine P, Dubuisson JM, Abiven YM, Janolin PE, Kiat JM, Dumont Y, Berini B, Fouchet A, Keller N. FORTE - a multipurpose high-vacuum diffractometer for tender X-ray diffraction and spectroscopy at the SIRIUS beamline of Synchrotron SOLEIL. J Synchrotron Radiat 2019; 26:1374-1387. [PMID: 31274467 DOI: 10.1107/s1600577519003722] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 03/18/2019] [Indexed: 06/09/2023]
Abstract
A new high-vacuum multipurpose diffractometer (called FORTE from the French acronyms of the project) has recently been installed at the tender/hard X-ray SIRIUS beamline of Synchrotron SOLEIL, France. The geometry chosen allows one to work either in the classical Eulerian four-circle geometry for bulk X-ray diffraction (XRD) or in the z-axis geometry for surface XRD. The diffractometer nicely fits the characteristics of the SIRIUS beamline, optimized to work in the 1.1-4.5 keV range, and allows one to perform unprecedented diffraction anomalous fine structure (DAFS) experiments in the tender X-ray region, also around non-specular reflections, covering a large reciprocal-space volume. Installation of an X-ray fluorescence detector on a dedicated flange allows simultaneous DAFS and X-ray absorption (XAS) measurements. The access to the tender X-ray region paves the way to resonant investigations around the L-edges of second-row transition elements which are constituents of functional oxide materials. It also enables access to several edges of interest for semiconductors. Finally, the control architecture based on synchronized Delta Tau units opens up exciting perspectives for improvement of the mechanical sphere of confusion.
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Affiliation(s)
- G Ciatto
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48 F-91192 Gif sur Yvette CEDEX, France
| | - N Aubert
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48 F-91192 Gif sur Yvette CEDEX, France
| | - M Lecroard
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48 F-91192 Gif sur Yvette CEDEX, France
| | - C Engblom
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48 F-91192 Gif sur Yvette CEDEX, France
| | - P Fontaine
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48 F-91192 Gif sur Yvette CEDEX, France
| | - J M Dubuisson
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48 F-91192 Gif sur Yvette CEDEX, France
| | - Y M Abiven
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48 F-91192 Gif sur Yvette CEDEX, France
| | - P E Janolin
- Laboratoire SPMS, UMR CNRS-CentraleSupélec, Bâtiment Gustave Eiffel - MB.105, 8-10 rue Joliot-Curie, 91190 Gif-Sur-Yvette CEDEX, France
| | - J M Kiat
- Laboratoire SPMS, UMR CNRS-CentraleSupélec, Bâtiment Gustave Eiffel - MB.105, 8-10 rue Joliot-Curie, 91190 Gif-Sur-Yvette CEDEX, France
| | - Y Dumont
- Groupe d'Etudes de la Matière Condensée (GEMaC), Université Versailles Saint-Quentin en Yvelines - CNRS, Université Paris-Saclay, Versailles, France
| | - B Berini
- Groupe d'Etudes de la Matière Condensée (GEMaC), Université Versailles Saint-Quentin en Yvelines - CNRS, Université Paris-Saclay, Versailles, France
| | - A Fouchet
- Groupe d'Etudes de la Matière Condensée (GEMaC), Université Versailles Saint-Quentin en Yvelines - CNRS, Université Paris-Saclay, Versailles, France
| | - N Keller
- Groupe d'Etudes de la Matière Condensée (GEMaC), Université Versailles Saint-Quentin en Yvelines - CNRS, Université Paris-Saclay, Versailles, France
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17
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Ouchar Mahamat O, Lounnas M, Hide M, Dumont Y, Tidjani A, Kamougam K, Abderrahmane M, Benavides J, Solassol J, Bañuls AL, Jean-Pierre H, Carrière C, Godreuil S. High prevalence and characterization of extended-spectrum ß-lactamase producing Enterobacteriaceae in Chadian hospitals. BMC Infect Dis 2019; 19:205. [PMID: 30819135 PMCID: PMC6396450 DOI: 10.1186/s12879-019-3838-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Accepted: 02/20/2019] [Indexed: 11/15/2022] Open
Abstract
Background Extended-spectrum ß-lactamase-producing Enterobacteriaceae (ESBL-PE) represent a major problem in the management of nosocomial infections. However, ESBL-PE are not systematically monitored in African countries. The aim of this study was to determine ESBL-PE prevalence in patients from three hospitals in N’Djamena, the capital city of Chad, and to characterize the genetic origin of the observed resistance. Methods From January to March 2017, 313 non-duplicate isolates were recovered from various clinical specimens obtained from 1713 patients in the three main hospitals of N’Djamena. Bacterial species were identified by matrix-assisted laser desorption ionization-time of flight mass spectrometry. Susceptibility to 28 antibiotics was tested using the disk diffusion method on Müller-Hinton agar, and ESBL production was confirmed with the double-disc synergy test. The most prevalent ESBL genes associated with the observed resistance were detected using multiplex PCR followed by double-stranded DNA sequencing. Results Among the 313 isolates, 197 belonged to the Enterobacteriaceae family. The overall ESBL-PE prevalence was 47.72% (n = 94/197), with a higher rate among inpatients compared with outpatients (54.13% vs. 34.37%). ESBL-PE prevalence was highest in older patients (≥60 years of age). E. coli was the most common ESBL-producer organism (63.8%), followed by K. pneumoniae (21.2%). ESBL-PE were mainly found in urine samples (75%). The CTX-M-1 group was dominant (96.7% of the 94 ESBL-PE isolates, CTX-M-15 enzyme), followed by the CTX-M-9 group (4.1%). 86% of resistant isolates harbored more than one ESBL-encoding gene. ESBL production was also associated with the highest levels of resistance to non-β-lactam drugs. Conclusions The prevalence of ESBL-PE harboring resistant genes encoding ESBLs of the CTX-M-1 group was high (48%) among clinical isolates of three main hospitals in Chad, suggesting an alarming spread of ESBL-PE among patients. Electronic supplementary material The online version of this article (10.1186/s12879-019-3838-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Oumar Ouchar Mahamat
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France. .,UMR MIVEGEC IRD-CNRS-Université de Montpellier, Laboratory of Bacteriology CHU, Arnaud de Villeneuve 371 avenue du doyen Gaston Giraud, 34295, Montpellier Cedex 5, France. .,Service de laboratoire, Hôpital de la Mère et de l'Enfant, N'Djaména, Chad.
| | - Manon Lounnas
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France.,UMR MIVEGEC IRD-CNRS-Université de Montpellier, Laboratory of Bacteriology CHU, Arnaud de Villeneuve 371 avenue du doyen Gaston Giraud, 34295, Montpellier Cedex 5, France
| | - Mallorie Hide
- UMR MIVEGEC IRD-CNRS-Université de Montpellier, Laboratory of Bacteriology CHU, Arnaud de Villeneuve 371 avenue du doyen Gaston Giraud, 34295, Montpellier Cedex 5, France
| | - Yann Dumont
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France
| | | | - Kadidja Kamougam
- Service de laboratoire, Hôpital Général des Références Nationale, N'Djaména, Chad
| | | | - Julio Benavides
- Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Jérôme Solassol
- Centre Hospitalier Universitaire de Montpellier, Département Bio-pathologie cellulaire et tissulaire des tumeurs, Université de Montpellier, Montpellier, France
| | - Anne-Laure Bañuls
- UMR MIVEGEC IRD-CNRS-Université de Montpellier, Laboratory of Bacteriology CHU, Arnaud de Villeneuve 371 avenue du doyen Gaston Giraud, 34295, Montpellier Cedex 5, France.,Laboraoire Mixte International DRISA, IRD, Montpellier, France
| | - Hélène Jean-Pierre
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France
| | - Christian Carrière
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France
| | - Sylvain Godreuil
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France.,UMR MIVEGEC IRD-CNRS-Université de Montpellier, Laboratory of Bacteriology CHU, Arnaud de Villeneuve 371 avenue du doyen Gaston Giraud, 34295, Montpellier Cedex 5, France.,Laboraoire Mixte International DRISA, IRD, Montpellier, France
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18
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Nabti LZ, Sahli F, Radji N, Mezaghcha W, Semara L, Aberkane S, Lounnas M, Solassol J, Didelot MN, Jean-Pierre H, Dumont Y, Godreuil S. High Prevalence of Multidrug-Resistant Escherichia coli in Urine Samples from Inpatients and Outpatients at a Tertiary Care Hospital in Sétif, Algeria. Microb Drug Resist 2019; 25:386-393. [PMID: 30676258 DOI: 10.1089/mdr.2018.0314] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The worldwide dissemination of multidrug-resistant (MDR) Enterobacteriaceae is a major public health issue. The aim of this study was to investigate the prevalence of MDR Escherichia coli (MDR-EC) isolates, in inpatients/outpatients with urinary tract infections at Sétif University Hospital (Algeria). Bacterial cultures were obtained from 426 of the 3,944 urine samples collected from January 2015 to February 2017. Among these cultures, 215 E. coli isolates were identified by mass spectrometry, and 38 (17.7%) were MDR-EC (disk diffusion method): 36 produced only extended-spectrum β-lactamases (ESBL), one ESBL and a carbapenemase, and one only a cephalosporinase (double-disk synergy test). Multiplex PCR and sequencing analyses showed that 37 ESBL-producing isolates harbored genes encoding CTX-M enzymes (CTX-M-15 in 33 isolates, 89.19%; and CTX-M-14 group in four isolates, 10.81%). One CTX-M-15-producing isolate co-expressed also an OXA-48-like carbapenemase. Phylogenetic group analysis of the 37 ESBL-producing and 178 non-ESBL-producing isolates indicated that the most common phylogenetic group was B2 (54.05% of ESBL-producing and 48.31% of non-ESBL-producing isolates), followed by A and D for ESBL-, and by B1, A, and F for non-ESBL-producing isolates. This is the first report highlighting the presence of MDR-EC isolates that produce both CTX-M and OXA-48-like enzymes in Sétif, Algeria.
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Affiliation(s)
- Larbi Zakaria Nabti
- 1 Laboratoire de Valorisation des Ressources Biologiques et Naturelles, FSNV, Université de Sétif 1, Sétif, Algérie.,2 Département des Sciences Naturelles, École Normale Supérieure Assia Djebar, Constantine, Algérie
| | - Farida Sahli
- 1 Laboratoire de Valorisation des Ressources Biologiques et Naturelles, FSNV, Université de Sétif 1, Sétif, Algérie.,3 Faculté de Médecine, Université de Sétif 1, Sétif, Algérie.,4 Laboratoire de Microbiologie, Centre Hospitalier Universitaire (CHU) de Sétif, Sétif, Algérie
| | - Nadia Radji
- 3 Faculté de Médecine, Université de Sétif 1, Sétif, Algérie.,4 Laboratoire de Microbiologie, Centre Hospitalier Universitaire (CHU) de Sétif, Sétif, Algérie
| | - Wahiba Mezaghcha
- 3 Faculté de Médecine, Université de Sétif 1, Sétif, Algérie.,4 Laboratoire de Microbiologie, Centre Hospitalier Universitaire (CHU) de Sétif, Sétif, Algérie
| | - Lounis Semara
- 1 Laboratoire de Valorisation des Ressources Biologiques et Naturelles, FSNV, Université de Sétif 1, Sétif, Algérie
| | - Salim Aberkane
- 5 CHU de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France.,6 UMR MIVEGEC IRD-CNRS-Université de Montpellier, IRD, Montpellier, France
| | - Manon Lounnas
- 5 CHU de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France.,6 UMR MIVEGEC IRD-CNRS-Université de Montpellier, IRD, Montpellier, France
| | - Jérôme Solassol
- 7 Département Bio-pathologie cellulaire et tissulaire des tumeurs, CHU de Montpellier, Université de Montpellier, Montpellier, France
| | - Marie-Noelle Didelot
- 5 CHU de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France
| | - Hélène Jean-Pierre
- 5 CHU de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France.,6 UMR MIVEGEC IRD-CNRS-Université de Montpellier, IRD, Montpellier, France
| | - Yann Dumont
- 5 CHU de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France.,6 UMR MIVEGEC IRD-CNRS-Université de Montpellier, IRD, Montpellier, France
| | - Sylvain Godreuil
- 5 CHU de Montpellier, Laboratoire de Bactériologie, Université de Montpellier, Montpellier, France.,6 UMR MIVEGEC IRD-CNRS-Université de Montpellier, IRD, Montpellier, France
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19
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Yatat V, Couteron P, Dumont Y. Spatially explicit modelling of tree–grass interactions in fire-prone savannas: A partial differential equations framework. Ecological Complexity 2018. [DOI: 10.1016/j.ecocom.2017.06.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Chatre C, Dumont Y, Morquin D, Boever CMD, Gandet T, Albat B, Reynes J, Le Moing V. Les récidives d’endocardite infectieuse à entérocoque : fréquence et facteurs favorisants. Med Mal Infect 2018. [DOI: 10.1016/j.medmal.2018.04.180] [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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21
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Chapwanya M, Dumont Y. On crop vector-borne diseases. Impact of virus lifespan and contact rate on the traveling-wave speed of infective fronts. Ecological Complexity 2018. [DOI: 10.1016/j.ecocom.2017.08.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Aberkane S, Pradel B, Dumont Y, Veloo AC, Laurens C, Bonzon L, Godreuil S, Marchandin H, Jean-Pierre H. Clinical sources and antimicrobial susceptibility of Prevotella timonensis at the university hospital of Montpellier, France. Anaerobe 2018; 50:19-21. [DOI: 10.1016/j.anaerobe.2018.01.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 12/29/2017] [Accepted: 01/03/2018] [Indexed: 12/21/2022]
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23
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Butin M, Dumont Y, Rasigade JP, Martins Simoes P, Hoden L, Picaud JC, Laurent F. Chromogenic detection procedure for the multidrug-resistant, neonatal sepsis-associated clone Staphylococcus capitis NRCS-A. Diagn Microbiol Infect Dis 2017; 90:81-82. [PMID: 29157953 DOI: 10.1016/j.diagmicrobio.2017.10.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 08/29/2017] [Revised: 10/14/2017] [Accepted: 10/16/2017] [Indexed: 10/18/2022]
Abstract
The multiresistant Staphylococcus capitis clone NRCS-A is a major pathogen in neonates worldwide. We show that NRCS-A grows as mauve colonies with a cream-color halo after a 5-day incubation on MRSA Brilliance 2 agar (Oxoid®). This innovative protocol will ease the screening of clinical and environmental niches of this clone.
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Affiliation(s)
- Marine Butin
- International Center of Research in Infectiology, INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure, University of Lyon, Lyon, France; Neonatal Intensive Care Unit, Eastern Hospital Group, Hospices Civils de Lyon, Lyon, France; Institute of Infectious Agents, Northern Hospital Group, Hospices Civils de Lyon, Lyon, France.
| | - Yann Dumont
- Institute of Infectious Agents, Northern Hospital Group, Hospices Civils de Lyon, Lyon, France
| | - Jean-Philippe Rasigade
- International Center of Research in Infectiology, INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure, University of Lyon, Lyon, France; Institute of Infectious Agents, Northern Hospital Group, Hospices Civils de Lyon, Lyon, France
| | - Patricia Martins Simoes
- International Center of Research in Infectiology, INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure, University of Lyon, Lyon, France; Institute of Infectious Agents, Northern Hospital Group, Hospices Civils de Lyon, Lyon, France
| | - Louise Hoden
- Institute of Infectious Agents, Northern Hospital Group, Hospices Civils de Lyon, Lyon, France
| | - Jean-Charles Picaud
- Neonatal Intensive Care Unit, Northern Hospital Group, Hospices Civils de Lyon, Lyon, France
| | - Frédéric Laurent
- International Center of Research in Infectiology, INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure, University of Lyon, Lyon, France; Institute of Infectious Agents, Northern Hospital Group, Hospices Civils de Lyon, Lyon, France; Department of Microbiology-Mycology, Institut des Sciences Pharmaceutiques et Biologiques de Lyon, University of Lyon, Lyon, France
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24
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Appelgren A, Morquin D, Dufour S, Le Moing V, Reynes J, Lotthé A, Parer S, Corbeau C, Aubry A, Sougakoff W, Solassol J, Bonzon L, Dumont Y, Godreuil S. Investigation of pre-XDR Beijing Mycobacterium tuberculosis transmission to a healthcare worker in France, 2016. J Hosp Infect 2017; 97:414-417. [PMID: 28669673 DOI: 10.1016/j.jhin.2017.06.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 06/27/2017] [Indexed: 11/26/2022]
Abstract
A case of occupational contamination of a healthcare worker by a pre-extensively drug-resistant (pre-XDR) Beijing strain of Mycobacterium tuberculosis at the University Hospital of Montpellier, France is reported. The index case was identified using genetic fingerprinting of isolates. This report underscores the risk of healthcare-associated contamination by pre-XDR tuberculosis (TB) in low-incidence countries and the importance of molecular tools for TB care. It also calls for increased vigilance in the management of multi-drug-resistant/XDR TB patients.
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Affiliation(s)
- A Appelgren
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Montpellier, France; MIVEGEC, UMR IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France.
| | - D Morquin
- Centre Hospitalier Universitaire de Montpellier, Département des Maladies Infectieuses et Tropicales, Montpellier, France
| | - S Dufour
- Centre Hospitalier Universitaire de Montpellier, Département des Maladies Infectieuses et Tropicales, Montpellier, France
| | - V Le Moing
- Centre Hospitalier Universitaire de Montpellier, Département des Maladies Infectieuses et Tropicales, Montpellier, France; Université de Montpellier-IRD UMI233-INSERM U1175, Montpellier, France
| | - J Reynes
- Centre Hospitalier Universitaire de Montpellier, Département des Maladies Infectieuses et Tropicales, Montpellier, France; Université de Montpellier-IRD UMI233-INSERM U1175, Montpellier, France
| | - A Lotthé
- Centre Hospitalier Universitaire de Montpellier, Département d'Hygiène Hospitalière, Montpellier, France
| | - S Parer
- Centre Hospitalier Universitaire de Montpellier, Département d'Hygiène Hospitalière, Montpellier, France
| | - C Corbeau
- Centre Hospitalier Universitaire de Montpellier, Centre de Lutte Antituberculeuse, Montpellier, France
| | - A Aubry
- AP-HP, Hôpital Pitié-Salpêtrière, Centre National de Référence des Mycobactéries et de la Résistance des Mycobactéries aux Antituberculeux, Bactériologie-Hygiène, Paris, France; Sorbonne Universités, UPMC Université Paris 06, CR7, INSERM, U1135, Centre d'Immunologie et des Maladies Infectieuses, CIMI, Team E13 (Bacteriology), Paris, France
| | - W Sougakoff
- AP-HP, Hôpital Pitié-Salpêtrière, Centre National de Référence des Mycobactéries et de la Résistance des Mycobactéries aux Antituberculeux, Bactériologie-Hygiène, Paris, France; Sorbonne Universités, UPMC Université Paris 06, CR7, INSERM, U1135, Centre d'Immunologie et des Maladies Infectieuses, CIMI, Team E13 (Bacteriology), Paris, France
| | - J Solassol
- Centre Hospitalier Universitaire de Montpellier, Département Biopathologie cellulaire et tissulaire des tumeurs, Montpellier, France
| | - L Bonzon
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Montpellier, France; MIVEGEC, UMR IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
| | - Y Dumont
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Montpellier, France; MIVEGEC, UMR IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
| | - S Godreuil
- Centre Hospitalier Universitaire de Montpellier, Laboratoire de Bactériologie, Montpellier, France; MIVEGEC, UMR IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
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25
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Simões PM, Lemriss H, Dumont Y, Lemriss S, Rasigade JP, Assant-Trouillet S, Ibrahimi A, El Kabbaj S, Butin M, Laurent F. Single-Molecule Sequencing (PacBio) of the Staphylococcus capitis NRCS-A Clone Reveals the Basis of Multidrug Resistance and Adaptation to the Neonatal Intensive Care Unit Environment. Front Microbiol 2016; 7:1991. [PMID: 28018320 PMCID: PMC5157051 DOI: 10.3389/fmicb.2016.01991] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 11/28/2016] [Indexed: 01/22/2023] Open
Abstract
The multi-resistant Staphylococcus capitis clone NRCS-A has recently been described as a major pathogen causing nosocomial, late-onset sepsis (LOS) in preterm neonates worldwide. NRCS-A representatives exhibit an atypical antibiotic resistance profile. Here, the complete closed genome (chromosomal and plasmid sequences) of NRCS-A prototype strain CR01 and the draft genomes of three other clinical NRCS-A strains from Australia, Belgium and the United Kingdom are annotated and compared to available non-NRCS-A S. capitis genomes. Our goal was to delineate the uniqueness of the NRCS-A clone with respect to antibiotic resistance, virulence factors and mobile genetic elements. We identified 6 antimicrobial resistance genes, all carried by mobile genetic elements. Previously described virulence genes present in the NRCS-A genomes are shared with the six non-NRCS-A S. capitis genomes. Overall, 63 genes are specific to the NRCS-A lineage, including 28 genes located in the methicillin-resistance cassette SCCmec. Among the 35 remaining genes, 25 are of unknown function, and 9 correspond to an additional type I restriction modification system (n = 3), a cytosine methylation operon (n = 2), and a cluster of genes related to the biosynthesis of teichoic acids (n = 4). Interestingly, a tenth gene corresponds to a resistance determinant for nisin (nsr gene), a bacteriocin secreted by potential NRCS-A strain niche competitors in the gut microbiota. The genomic characteristics presented here emphasize the contribution of mobile genetic elements to the emergence of multidrug resistance in the S. capitis NRCS-A clone. No NRCS-A-specific known virulence determinant was detected, which does not support a role for virulence as a driving force of NRCS-A emergence in NICUs worldwide. However, the presence of a nisin resistance determinant on the NRCS-A chromosome, but not in other S. capitis strains and most coagulase-negative representatives, might confer a competitive advantage to NRCS-A strains during the early steps of gut colonization in neonates. This suggests that the striking adaptation of NRCS-A to the NICU environment might be related to its specific antimicrobial resistance and also to a possible enhanced ability to challenge competing bacteria in its ecological niche.
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Affiliation(s)
- Patrícia Martins Simões
- Department of Clinical Microbiology, Northern Hospital Group, Hospices Civils de LyonLyon, France; International Centre for Research in Infectious Diseases, Institut National de la Santé et de la Recherche Médicale U1111, University of LyonLyon, France; National Reference Center for Staphylococci, Hospices Civils de LyonLyon, France
| | - Hajar Lemriss
- Biotechnology Laboratory (Medbiotech), Medical and Pharmacy School, University Mohammed V de Rabat Rabat, Morocco
| | - Yann Dumont
- Department of Clinical Microbiology, Eastern Hospital Group, Hospices Civils de Lyon Lyon, France
| | - Sanâa Lemriss
- Department of Biosecurity PCL3, Laboratory of Research and Medical Analysis of the Fraternal of Gendarmerie Royale Rabat, Morocco
| | - Jean-Philippe Rasigade
- International Centre for Research in Infectious Diseases, Institut National de la Santé et de la Recherche Médicale U1111, University of LyonLyon, France; National Reference Center for Staphylococci, Hospices Civils de LyonLyon, France
| | - Sophie Assant-Trouillet
- Department of Clinical Microbiology, Northern Hospital Group, Hospices Civils de LyonLyon, France; International Centre for Research in Infectious Diseases, Institut National de la Santé et de la Recherche Médicale U1111, University of LyonLyon, France
| | - Azeddine Ibrahimi
- Biotechnology Laboratory (Medbiotech), Medical and Pharmacy School, University Mohammed V de Rabat Rabat, Morocco
| | - Saâd El Kabbaj
- Department of Biosecurity PCL3, Laboratory of Research and Medical Analysis of the Fraternal of Gendarmerie Royale Rabat, Morocco
| | - Marine Butin
- Department of Clinical Microbiology, Northern Hospital Group, Hospices Civils de LyonLyon, France; Neonatal Intensive Care Unit, Eastern Hospital Group, Hospices Civils de LyonLyon, France
| | - Frédéric Laurent
- Department of Clinical Microbiology, Northern Hospital Group, Hospices Civils de LyonLyon, France; International Centre for Research in Infectious Diseases, Institut National de la Santé et de la Recherche Médicale U1111, University of LyonLyon, France; National Reference Center for Staphylococci, Hospices Civils de LyonLyon, France
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Abstract
In this work, we consider a simple theoretical model that enables us to take into account private human decisions that may interfere with public mosquito control. The model reflects the trade-off between perceived costs and observed efficacy. Our theoretical results emphasize that households may reduce their protective behavior in response to mechanical elimination techniques piloted by a public agent, leading to an increase in the total number of mosquitoes in the surrounding environment and generating a barrier for vector-borne diseases control. Our study is sufficiently generic to be applied to different arboviral diseases. It also shows that vector-control models and strategies have to take into account individual behaviors.
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Affiliation(s)
- Y Dumont
- CIRAD, UMR AMAP. TA A51/PS2, 34398 Montpellier cedex 5, France.
| | - J Thuilliez
- CNRS - Paris 1 Panthéon Sorbonne University, Centre d'économie de la Sorbonne. 106-112, Boulevard de l'Hôpital, 75013 Paris, France
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Demchenko A, Chang Y, Chikoidze E, Berini B, Lefèvre C, Roulland F, Ulhaq-Bouillet C, Versini G, Barre S, Leuvrey C, Favre-Nicolin V, Boudet N, Zafeiratos S, Dumont Y, Viart N. Tuning the conductivity type in a room temperature magnetic oxide: Ni-doped Ga0.6Fe1.4O3 thin films. RSC Adv 2016. [DOI: 10.1039/c6ra01540a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The mechanism responsible for conduction in pulsed laser deposited thin films of room temperature ferrimagnetic Ga0.6Fe1.4O3 is fully elucidated. The conduction type can be tuned from n to p through doping with bivalent Ni ions.
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Bocher L, Popova E, Nolan M, Gloter A, Chikoidze E, March K, Warot-Fonrose B, Berini B, Stéphan O, Keller N, Dumont Y. Direct evidence of Fe(2+)-Fe3+ charge ordering in the ferrimagnetic hematite-ilmenite Fe(1.35)Ti(0.65)O(3-δ) thin films. Phys Rev Lett 2013; 111:167202. [PMID: 24182295 DOI: 10.1103/physrevlett.111.167202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Indexed: 06/02/2023]
Abstract
In this Letter we highlight direct experimental evidence of Fe(2+)-Fe3+ charge ordering at room temperature in hematite-ilmenite Fe(1.35)Ti(0.65)O(3-δ) epitaxial thin films grown by pulsed laser deposition, using aberration-corrected scanning transmission electron microscopy coupled to high-resolution energy electron-loss spectroscopy. These advanced spectromicroscopy techniques demonstrate a strong modulation of the Fe2+ valence state along the c axis. Density functional theory calculations provide crucial information on the key role of oxygen vacancies in the observed charge distributions. Their presence at significant levels leads to the localization of extra electrons onto reduced Fe2+ sites, while Ti remains solely +4. The magnetic and transport properties of these films are reviewed in the light of the present results regarding their ferrimagnetic character correlated with the Fe2+ modulation and their semiconducting behavior interpreted by an Efros-Shklovskii variable-range hopping conduction regime via Fe2+ and Fe3+ centers. The experimental evidence of only one type of mixed valence state, i.e., Fe2+ and Fe3+, in the Fe(2-x)Ti(x)O(3-δ) system will thus help to interpret further the origin of its geomagnetic properties and to illuminate fundamental issues regarding its spintronic potential.
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Affiliation(s)
- L Bocher
- Laboratoire de Physique des Solides, Bâtiment 510, UMR 8502, Université Paris Sud XI and CNRS, 91405 Orsay, France
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Morales-Medina JC, Dumont Y, Bonaventure P, Quirion R. Chronic administration of the Y2 receptor antagonist, JNJ-31020028, induced anti-depressant like-behaviors in olfactory bulbectomized rat. Neuropeptides 2012; 46:329-34. [PMID: 23103057 DOI: 10.1016/j.npep.2012.09.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 09/06/2012] [Accepted: 09/17/2012] [Indexed: 11/24/2022]
Abstract
Recent studies from our groups have shown that BIIE0246, a Y2 receptor antagonist, has antidepressant effect in olfactory bulbectomized (OBX) rat. However, its complex structure and high molecular weight limit its usefulness as an in vivo pharmacological tool. Alternatively, the novel and brain penetrant Y2 receptor antagonist, JNJ-31020028 is a useful tool to investigate the in vivo function of the Y2 receptor. In the present study, we evaluated the effect of chronic intracerebroventricular (icv) administration of JNJ-31020028 in a battery of behavioral tests in an animal model that mimics several deficits observed in the human depression, the OBX rat. Chronic administration of JNJ-31020028 induced a decrease in immobility time in the forced swim test in OBX while had no effect in control animals. Additionally, it decreased number of grooming events in OBX animals, but had no effects on some other behavioral deficits observed such as rearing and hyperlocomotion. Furthermore, JNJ-31020028 had no effect on behavior tests that are commonly used to evaluate anxiety, namely the social interaction test in both OBX and control animals. These data indicate that similar to BIIE0246, JNJ-31020028 also has antidepressant like effects in the OBX model.
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Affiliation(s)
- J C Morales-Medina
- Dept. of Neurology & Neurosurgery, McGill University, Montreal, QC, Canada
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Abstract
We design, analyze and implement nonstandard finite difference (NSFD) schemes for some differential models in biosciences. The NSFD schemes are reliable in three directions. They are topologically dynamically consistent for onedimensional models. They can replicate the global asymptotic stability of the disease-free equilibrium of the MSEIR model in epidemiology whenever the basic reproduction number is less than 1. They preserve the positivity and boundedness property of solutions of advection-reaction and reaction-diffusion equations.
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Affiliation(s)
- R Anguelov
- Department of Mathematics and Applied Mathematics, University of Pretoria, South Africa
| | - Y Dumont
- CIRAD, Umr AMAP, Montpellier, France
| | - J M-S Lubuma
- Department of Mathematics and Applied Mathematics, University of Pretoria, South Africa
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Dumont Y, Tchuenche JM. Mathematical studies on the sterile insect technique for the Chikungunya disease and Aedes albopictus. J Math Biol 2011; 65:809-54. [PMID: 22038083 DOI: 10.1007/s00285-011-0477-6] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 09/30/2011] [Indexed: 11/28/2022]
Abstract
Chikungunya is an arthropod-borne disease caused by the Asian tiger mosquito, Aedes albopictus. It can be an important burden to public health and a great cause of morbidity and, sometimes, mortality. Understanding if and when disease control measures should be taken is key to curtail its spread. Dumont and Chiroleu (Math Biosc Eng 7(2):315-348, 2010) showed that the use of chemical control tools such as adulticide and larvicide, and mechanical control, which consists of reducing the breeding sites, would have been useful to control the explosive 2006 epidemic in Réunion Island. Despite this, chemical control tools cannot be of long-time use, because they can induce mosquito resistance, and are detrimental to the biodiversity. It is therefore necessary to develop and test new control tools that are more sustainable, with the same efficacy (if possible). Mathematical models of sterile insect technique (SIT) to prevent, reduce, eliminate or stop an epidemic of Chikungunya are formulated and analysed. In particular, we propose a new model that considers pulsed periodic releases, which leads to a hybrid dynamical system. This pulsed SIT model is coupled with the human population at different epidemiological states in order to assess its efficacy. Numerical simulations for the pulsed SIT, using an appropriate numerical scheme are provided. Analytical and numerical results indicate that pulsed SIT with small and frequent releases can be an alternative to chemical control tools, but only if it is used or applied early after the beginning of the epidemic or as a preventive tool.
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Affiliation(s)
- Y Dumont
- CIRAD, Umr AMAP, 34989, Montpellier, France.
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Dumont Y, Chiroleu F, Domerg C. On a temporal model for the Chikungunya disease: modeling, theory and numerics. Math Biosci 2008; 213:80-91. [PMID: 18394655 DOI: 10.1016/j.mbs.2008.02.008] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Revised: 01/28/2008] [Accepted: 02/18/2008] [Indexed: 11/16/2022]
Abstract
Reunion Island faced two episodes of Chikungunya, a vector-borne disease, in 2005 and in 2006. The latter was of unprecedented magnitude: one third of the population was infected. Until the severe episode of 2006, our knowledge of Chikungunya was very limited. The principal aim of our study is to propose a model, including human and mosquito compartments, that is associated to the time course of the first epidemic of Chikungunya. By computing the basic reproduction number R(0), we show there exists a disease-free equilibrium that is locally asymptotically stable if the basic reproduction number is less than 1. Moreover, we give a necessary condition for global asymptotic stability of the disease-free equilibrium. Then, we propose a numerical scheme that is qualitatively stable and present several simulations as well as numerical estimates of the basic reproduction number for some cities of Reunion Island. For the episode of 2005, R(0) was less than one, which partly explains why no outbreak appeared. Using recent entomological results, we investigate links between the episode of 2005 and the outbreak of 2006. Finally, our work shows that R(0) varied from place to place on the island, indicating that quick and focused interventions, like the destruction of breeding sites, may be effective for controlling the disease.
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Affiliation(s)
- Y Dumont
- IREMIA-Université de la Réunion, 97715 Saint-Denis, France.
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Abstract
Neuropeptide Y (NPY) is considered to be an important neuromodulator in the regulation of emotional behavior. For example, NPY is consistently involved in anxiety-related behaviors and there is increasing support for a role of this peptide in mood disorders such as depression. Furthermore, recent evidence suggests that NPY has a significant role in the neurobiological response to alcohol, including alcohol consumption, dependence, and withdrawal. In addition, NPY is beginning to emerge as an important modulator in the etiology of alcoholism that is independent from the addictive and reinforcing properties of the traditional system commonly associated with dopamine and instead, is strongly associated with innate emotionality. The recent developments elucidating the role of NPY in emotion and alcohol dependence are reviewed and the potential of the NPY system as a novel therapeutic strategy in the treatment of anxiety, depression and alcohol-related disorders is examined.
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Affiliation(s)
- C Carvajal
- Douglas Hospital Research Centre, Dept. of Psychiatry, McGill University, 6875 LaSalle Blvd., Montréal, QC, Canada, H4H 1R3
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Ashdown H, Dumont Y, Ng M, Poole S, Boksa P, Luheshi GN. The role of cytokines in mediating effects of prenatal infection on the fetus: implications for schizophrenia. Mol Psychiatry 2006; 11:47-55. [PMID: 16189509 DOI: 10.1038/sj.mp.4001748] [Citation(s) in RCA: 283] [Impact Index Per Article: 15.7] [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: 11/08/2022]
Abstract
Maternal infections with bacterial or viral agents during pregnancy are associated with an increased incidence of schizophrenia in the offspring at adulthood although little is known about the mechanism by which maternal infection might affect fetal neurodevelopment. Exposure of pregnant rodents to the bacterial endotoxin, lipopolysaccharide (LPS), results in behavioral deficits in the adult offspring that are relevant to schizophrenia. It is however unknown whether these effects are due to the direct action of the inflammatory stimulus on the developing fetus, or due to secondary immune mediators (cytokines) activated at maternal/fetal sites. In this study we sought to elucidate the site of action of LPS, following a single intraperitoneal (i.p.) injection, in pregnant rats at gestation day 18. Animals received 5 muCi of iodinated LPS ((125)I-LPS) and its distribution was assessed in maternal/fetal tissues (1-8 h). In addition, induction of the inflammatory cytokines, TNF-alpha, IL-1beta and IL-6, was measured in maternal/fetal tissues following maternal LPS challenge (0.05 mg/kg, i.p.) (2-8 h). (125)I-LPS was detected in maternal tissues and placenta, but not the fetus. This distribution was accompanied by significant increases in TNF-alpha, IL-1beta and IL-6 in maternal plasma and placenta, but not in fetal liver or brain. A significant increase in IL-1beta was however detected in fetal plasma, possibly due to transfer from the maternal circulation or placenta. Collectively, these data suggest that effects of maternal LPS exposure on the developing fetal brain are not mediated by the direct action of LPS, but via indirect actions at the level of the maternal circulation or placenta.
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Affiliation(s)
- H Ashdown
- Department of Psychiatry, McGill University, Douglas Hospital Research Centre, 6875 LaSalle Boulevard, Verdun, Montreal, Quebec, Canada H4H 1R3
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Dumont Y, D'Amours M, Lebel M, Larivière R. Blood pressure-independent effect of angiotensin AT1 receptor blockade on renal endothelin-1 production in hypertensive uremic rats. J Hypertens 2001; 19:1479-87. [PMID: 11518857 DOI: 10.1097/00004872-200108000-00017] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE We recently reported that treatment of uremic rats with reduced renal mass with the angiotensin II (Ang II) subtype 1 receptor (AT1) antagonist losartan reduces endothelin-1 (ET-1) levels in blood vessels and in glomeruli. Although this suggests an important role for Ang II in the modulation of ET-1 production, the concomitant decrease in blood pressure may also be involved. The present study was designed to investigate whether the modulation of ET-1 production in uremic rats is related to tissue-specific effects of AT1 receptor blockade or to the antihypertensive effect of losartan. DESIGN One week after renal mass reduction, uremic rats were treated with the conventional triple therapy (TRx) [reserpine (5 mg/l), hydralazine (80 mg/l) and hydrochlorothiazide (25 mg/l)] or losartan (20 mg/kg per day) for 6 weeks. Immunoreactive-ET-1 (ir-ET-1) levels in plasma and urine, as well as in vascular and renal tissues were measured by a specific radioimmunoassay after sample extraction and purification. RESULTS Before treatment, systolic blood pressure was significantly higher in uremic animals compared to sham-operated controls (165+/-4 versus 123+/-2 mmHg, respectively; P < 0.01). Treatment with the TRx or with losartan normalized systolic blood pressure in uremic rats, whereas it was further increased in untreated uremic animals. At week 6, serum creatinine, proteinuria and urinary ET-1 and transforming growth factor-beta1 (TGF-beta1) excretion, as well as vascular and glomerular ET-1 content were increased in uremic rats compared to the controls (P < 0.01). Treatment of uremic rats with the TRx or with losartan reduced ET-1 content in the thoracic aorta and the mesenteric arterial bed (P < 0.01). However, losartan, but not the TRx, significantly attenuated the rise of serum creatinine, proteinuria and urinary ET-1 and TGF-beta1 excretion, as well as ET-1 content in glomeruli of uremic rats. Compared with the controls, renal preproET-1 mRNA expression was also significantly higher in uremic rats. Treatment of uremic rats with losartan prevented renal preproET-1 mRNA overexpression, indicating that changes in glomerular ET-1 content and urinary ET-1 excretion were related to modulation of renal ET-1 production. CONCLUSIONS These findings indicate that the effect of losartan on ET-1 production in peripheral blood vessels may be mediated, in part, by the reduction of blood pressure. In contrast, the reduction of renal ET-1 production is mediated by tissue-specific effects of AT1 receptor blockade, and may contribute to the renal protective effects of losartan.
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Affiliation(s)
- Y Dumont
- Research Center and Division of Nephrology, CHUQ, L'Hôtel-Dieu de Québec, Canada
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37
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Abstract
The autoradiographic distribution of putative brain adrenomedullin receptors was investigated using [125I]human adrenomedullin(13-52) as a new radioligand. Specific [125I]human adrenomedullin(13-52) binding sites were very discretely distributed in the rat brain with enrichment seen in the choroid plexus and linings of the third, fourth and lateral ventricles, basolateral amygdaloid nuclei, neural lobe of the pituitary gland, the trigeminal nerves and in the granular cell layer of the cerebellum. To our knowledge, this is the first report on the discrete localization of adrenomedullin receptors in the mammalian brain.
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Affiliation(s)
- C Juaneda
- Douglas Hospital Research Centre and Department of Psychiatry, McGill University, 6875 La Salle Boulevard, H4H 1R3, Verdun, QC, Canada
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Mollereau C, Gouardères C, Dumont Y, Kotani M, Detheux M, Doods H, Parmentier M, Quirion R, Zajac JM. Agonist and antagonist activities on human NPFF(2) receptors of the NPY ligands GR231118 and BIBP3226. Br J Pharmacol 2001; 133:1-4. [PMID: 11325787 PMCID: PMC1572765 DOI: 10.1038/sj.bjp.0704049] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Neuropeptide FF (NPFF) is a part of a neurotransmitter system acting as a modulator of endogenous opioid functions. At this time, no non-peptide or peptide NPFF-antagonists have been discovered. Here, we demonstrate that Neuropeptide Y (NPY) ligands, in fact possess significant ability to interact with the human NPFF(2) receptors. NPY Y(1) antagonist BIBP3226 and mixed Y(1) antagonist/Y(4) agonist GR231118 are able to displace with low affinity, 50 -- 100 nM, the specific binding on NPFF receptors expressed in CHO cells as well as in rat dorsal spinal cord, an affinity however superior to those determined against Y(2), Y(4) or Y(5) receptors. Furthermore, BIBP3226 which is unable to inhibit the forskolin-stimulated cyclic AMP production mediated by NPFF(2) receptors, antagonizes the effect of NPFF, revealing the first antagonist of NPFF receptors. These properties of NPY ligands on Neuropeptide FF receptors must be considered when evaluating pharmacological activities of these drugs.
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Affiliation(s)
- C Mollereau
- Institut de Pharmacologie et Biologie Structurale, 205 route de Narbonne, 31077 Toulouse, France
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Dumont Y, D'Amours M, Lebel M, Larivière R. Supplementation with a low dose of L-arginine reduces blood pressure and endothelin-1 production in hypertensive uraemic rats. Nephrol Dial Transplant 2001; 16:746-54. [PMID: 11274268 DOI: 10.1093/ndt/16.4.746] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND We documented recently that increased endothelin-1 (ET-1) production in blood vessels and glomeruli of uraemic rats plays a crucial role in the development of hypertension and the progression of chronic renal failure. Normally, biological effects and local production of ET-1 are attenuated by the immediate release of nitric oxide (NO). Increasing evidence suggest, however, that NO release is impaired in chronic renal failure. We investigated whether supplementation with L-arginine, the natural precursor of NO, improves NO synthesis in uraemic rats with reduced renal mass and modulates vascular and renal ET-1 production as well as blood pressure and renal failure progression. METHODS One week after surgical renal mass reduction, the uraemic and sham-operated animals received either no treatment or 0.1% L-arginine in drinking water for 5 weeks. In another series of experiments, uraemic rats received 1% L-arginine for 5 weeks. Immunoreactive-ET-1 (ir-ET-1) levels in plasma, urine, and vascular and renal tissue preparations was measured by radioimmunoassay after sample extraction and purification. RESULTS Before treatment, systolic blood pressure was significantly elevated in uraemic animals compared to sham-operated controls (156+/-7 vs 111+/-3 mmHg, respectively; P<0.01). Thereafter, systolic blood pressure increased further in uraemic-untreated rats (systolic blood pressure at week 5; 199+/-9 mmHg, P<0.01), whereas it remained similar in uraemic rats supplemented with 0.1% L-arginine (171+/-9 mmHg, NS). At the end of the study, serum creatinine and urea, proteinuria and ir-ET-1 excretion were significantly augmented, while creatinine clearance was reduced in uraemic animals compared to the controls. Ir-ET-1 level was also increased in glomeruli as well as in thoracic aorta, mesenteric arterial bed, and pre-glomerular arteries, and was associated with vascular hypertrophy as assessed by tissue weight. In contrast, ir-ET-1 level was diminished in the renal papilla of uraemic rats. Treatment with 0.1% L-arginine significantly reduced proteinuria and urinary ir-ET-1 excretion (P<0.05) as well as ir-ET-1 level in glomeruli (P<0.01) and in thoracic aorta (P<0.05). These changes were associated with increased plasma NO metabolites NO2/NO3 levels in L-arginine-treated animals (P<0.01) and reduced aortic hypertrophy (P<0.05). In contrast, supplementation with 1% L-arginine had no effect on systolic blood pressure in uraemic rats, but exacerbated proteinuria and urinary ir-ET-1 excretion and increased serum urea (P<0.05) were observed. CONCLUSIONS These results indicate that improvement of NO release with a low dose but not with a high dose of L-arginine significantly attenuates the development of hypertension and the progression of renal insufficiency in rats with reduced renal mass. These protective effects may be mediated in part by the reduction of vascular and renal ET-1 production.
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Affiliation(s)
- Y Dumont
- Research Center and Division of Nephrology, CHUQ, L'Hôtel-Dieu de Québec, and Department of Medicine, Laval University, Quebec, Canada
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Quirion R, Chabot JGC, Dumont Y. Multiple Receptor Subtypes for the CGRP Super-Family. ScientificWorldJournal 2001. [PMCID: PMC6084419 DOI: 10.1100/tsw.2001.436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Molecular evidence for the existence of multiple receptors for CGRP has been rather difficult to obtain. Over 10 years after suggesting the existence of at least two classes (CGRP1 and CGRP2) of CGRP receptors on the basis of pharmacological data[1], molecular data on the CGRP2 receptor subtype are still lacking as well as potent and selective antagonists. The situation is somewhat different for the functional CGRP1 subtype which is likely composed of diverse subunits CRLR, RAMP1 and possibly RCP[2]. Moreover, BIBN 4096BS was recently reported as the first nonpeptide highly potent CGRP1 receptor antagonist[3]. However, in situ hybridization and receptor autoradiographic data have clearly shown the existence of major mismatches (e.g., cerebellum) between the discrete localization of CRLR, RAMP1, and specific CGRP binding sites supporting the existence of CGRP receptor subtypes. Functional studies have also provided evidence in that regard (for a recent review: [4]). Accordingly, additional studies aiming at cloning additional CGRP receptors are certainly warranted. Similarly, recent evidence from various laboratories including ours suggests the existence of more than one class (CRLR and RAMP2) of adrenomedullin receptors at least in the rat brain. In contrast, most evidence suggests the existence of a single class of amylin receptors. In brief, it appears that multiple receptors or receptor complexes do exist for CGRP and related peptides but their composition is apparently unique among the GPCR super-family and additional data are needed to fully establish the molecular organization of each subtype. Supported by CIHR of Canada.
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Affiliation(s)
- R. Quirion
- Douglas Hospital Research Center, McGill University, Montreal, QC, H4H 1R3, Canada
| | - J.-G. Chabot Chabot
- Douglas Hospital Research Center, McGill University, Montreal, QC, H4H 1R3, Canada
| | - Y. Dumont
- Douglas Hospital Research Center, McGill University, Montreal, QC, H4H 1R3, Canada
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Chabot JG, Juaneda C, Dumont Y, Fournier A, Quirion R. Evidence for the Differential Distribution of at Least Two Adrenomedullin Receptor Subtypes in the Rat Brain. ScientificWorldJournal 2001. [PMCID: PMC6083992 DOI: 10.1100/tsw.2001.408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- J.-G. Chabot
- Douglas Hospital Research Center and Department of Psychiatry, McGill University, Verdun, QC, H4H 1R3, Canada
| | - C. Juaneda
- Douglas Hospital Research Center and Department of Psychiatry, McGill University, Verdun, QC, H4H 1R3, Canada
| | - Y. Dumont
- Douglas Hospital Research Center and Department of Psychiatry, McGill University, Verdun, QC, H4H 1R3, Canada
| | - A. Fournier
- INRS-Institut Armand-Frappier, Université du Québec, Pointe-Claire, QC, H9R 1G6, Canada
| | - R. Quirion
- Douglas Hospital Research Center and Department of Psychiatry, McGill University, Verdun, QC, H4H 1R3, Canada
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Jafferali S, Dumont Y, Sotty F, Robitaille Y, Quirion R, Kar S. Insulin-like growth factor-I and its receptor in the frontal cortex, hippocampus, and cerebellum of normal human and alzheimer disease brains. Synapse 2000; 38:450-9. [PMID: 11044892 DOI: 10.1002/1098-2396(20001215)38:4<450::aid-syn10>3.0.co;2-j] [Citation(s) in RCA: 47] [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: 11/09/2022]
Abstract
Assimilated evidence indicates that the neurotoxic potential of amyloid beta (Abeta) peptide and an alteration in the level of growth factor(s) may possibly be involved in the loss of neurons observed in the brain of patients suffering from Alzheimer disease (AD), the prevalent cause of dementia in the elderly. In the present study, using receptor binding assays and immunocytochemistry, we evaluated the pharmacological profile of insulin-like growth factor-I (IGF-I) receptors and the distribution of IGF-I immunoreactivity in the frontal cortex, hippocampus, and cerebellum of AD and age-matched control brains. In control brains, [(125)I]IGF-I binding was inhibited more potently by IGF-I than by Des(1-3)IGF-I, IGF-II or insulin. The IC(50) values for IGF-I in the frontal cortex, hippocampus, and cerebellum of the normal brain did not differ significantly from the corresponding regions of the AD brain. Additionally, neither K(D) nor B(max) values were found to differ in the hippocampus of AD brains from the controls. At the regional levels, [(125)I]IGF-I binding sites in the AD brain also remained unaltered compared to the controls. As for the peptide itself, IGF-I immunoreactivity, in normal control brains, was evident primarily in a subpopulation of astrocytes in the frontal cortex and hippocampus, and in certain Purkinje cells of the cerebellum. In AD brains, a subset of Abeta-containing neuritic plaques, apart from astrocytes, exhibit IGF-I immunoreactivity. These results, taken together, suggest a role for IGF-I in compensatory plasticity and/or survival of the susceptible neurons in AD brains.
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Affiliation(s)
- S Jafferali
- Douglas Hospital Research Center, Department of Psychiatry, McGill University, Montreal, Canada
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Thorsell A, Michalkiewicz M, Dumont Y, Quirion R, Caberlotto L, Rimondini R, Mathé AA, Heilig M. Behavioral insensitivity to restraint stress, absent fear suppression of behavior and impaired spatial learning in transgenic rats with hippocampal neuropeptide Y overexpression. Proc Natl Acad Sci U S A 2000; 97:12852-7. [PMID: 11058155 PMCID: PMC18853 DOI: 10.1073/pnas.220232997] [Citation(s) in RCA: 259] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Exogenous neuropeptide Y (NPY) reduces experimental anxiety in a wide range of animal models. The generation of an NPY-transgenic rat has provided a unique model to examine the role of endogenous NPY in control of stress and anxiety-related behaviors using paradigms previously used by pharmacological studies. Locomotor activity and baseline behavior on the elevated plus maze were normal in transgenic subjects. Two robust phenotypic traits were observed. (i) Transgenic subjects showed a markedly attenuated sensitivity to behavioral consequences of stress, in that they were insensitive to the normal anxiogenic-like effect of restraint stress on the elevated plus maze and displayed absent fear suppression of behavior in a punished drinking test. (ii) A selective impairment of spatial memory acquisition was found in the Morris water maze. Control experiments suggest these traits to be independent. These phenotypic traits were accompanied by an overexpression of prepro-NPY mRNA and NPY peptide and decreased NPY-Y1 binding within the hippocampus, a brain structure implicated both in memory processing and stress responses. Data obtained using this unique model support and extend a previously postulated anti-stress action of NPY and provide novel evidence for a role of NPY in learning and memory.
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Affiliation(s)
- A Thorsell
- Addiction Center South, Karolinska Institutet, M46, Huddinge Hospital, SE-141 86 Huddinge, Sweden
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Abstract
Calcitonin gene-related peptides (alpha and beta isoforms), better known as CGRPalpha and CGRPbeta, were isolated twenty years ago. In fact, these were the first peptides to be characterized using a molecular cloning strategy, which is not the traditional approach of biochemical extraction and purification. Paradoxically, progress in the characterization of CGRP receptor subtypes has been extremely slow as a result of difficulties in their cloning and the lack of selective receptor subtype agonists and antagonists. However, exciting progress has been made overthe pasttwo years and is briefly reviewed here.
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Affiliation(s)
- C Juaneda
- Douglas Hospital Research Centre and Department of Psychiatry, Faculty of Medicine, McGill University, Montreal, Quebec, Canada.
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Bregola G, Dumont Y, Fournier A, Zucchini S, Quirion R, Simonato M. Decreased levels of neuropeptide Y(5) receptor binding sites in two experimental models of epilepsy. Neuroscience 2000; 98:697-703. [PMID: 10891613 DOI: 10.1016/s0306-4522(00)00162-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [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: 11/20/2022]
Abstract
It has been suggested that the anticonvulsant effects of neuropeptide Y (NPY) could be mediated by the activation of Y(2) and/or Y(5) receptors. NPY Y(1) receptor levels are known to decrease and Y(2) to increase in rat models of epilepsy. By using an autoradiographic approach, we investigated whether epilepsy models (kainic acid and kindling) are also associated with changes in Y(5) receptors. Compared with naive controls, [125I][Leu(31), Pro(34)]PYY/BIBP3226-insensitive (Y(5)) binding sites in the hippocampus (strata oriens and radiatum of CA3 and CA1) and in the neocortex (superficial layers) were unchanged in sham-stimulated rats, but reduced by approximately 50% in kindled rats (seven days after the last stimulus evokes seizure), and further reduced (to approximately -90%) 1h after a kindled seizure. Additionally, Y(5) receptor binding sites in the hippocampus and in the neocortex were unchanged 6h after kainic acid injection, but were highly reduced at 12 and 24h. No changes in Y(5) binding levels were found in the dentate gyrus and the pyramidal cell layer of the hippocampus. The present data suggest that changes in Y(5) receptor levels occur in epilepsy models. These changes may play a role in seizure expression and/or in the maintenance of kindling hyperexcitability.
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Affiliation(s)
- G Bregola
- Douglas Hospital Research Center, Department of Psychiatry, McGill University, QC, H4H 1R3, Montreal, Canada
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St-Pierre JA, Nouel D, Dumont Y, Beaudet A, Quirion R. Association of neuropeptide Y Y1 receptors with glutamate-positive and NPY-positive neurons in rat hippocampal cultures. Eur J Neurosci 2000; 12:1319-30. [PMID: 10762361 DOI: 10.1046/j.1460-9568.2000.00024.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The hippocampus is particularly enriched with neuropeptide tyrosine (NPY) and NPY receptors including the Y1, Y2 and Y5 subtypes. We have previously reported on the enrichment of cultured rat hippocampal neurons in specific [125I][Leu31, Pro34]PYY/BIBP3226-sensitive (Y1) binding sites and Y1 receptor mRNAs [St-Pierre et al. (1998) Br. J. Pharmacol., 123, p183]. We have now identified which cell types express the Y1 receptor. The majority of Y1 receptors, visualized using either the radiolabeled probe [125I][Leu31,Pro34]PYY or two antibodies directed against distinct domains of the Y1 receptor, was expressed in neurons as revealed by neuron-specific enolase (NSE) immunostaining. One antibody was directed against the second extracelllular loop of the Y1 receptor (amino acids 185-203) whereas the second was directed against the intracellular C-terminal loop (amino acids 355-382). The labelling was evident over both perikarya and processes. Neurons labelled by the various Y1 receptor probes were mostly glutamate-positive as revealed by double immunostaining. Most interestingly, a number of NPY-positive cultured hippocampal neurons were also enriched with the Y1 receptor, suggesting that this subtype may act as an autoreceptor to regulate NPY release in the hippocampus. These results thus provide an anatomical basis for the modulation of glutamate and NPY release by the Y1 receptor in the hippocampus.
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Affiliation(s)
- J A St-Pierre
- Douglas Hospital Research Center, Verdun Québec, H4H 1R3, Canada
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St-Pierre JA, Nouel D, Dumont Y, Beaudet A, Quirion R. Sub-population of cultured hippocampal astrocytes expresses neuropeptide Y Y(1) receptors. Glia 2000; 30:82-91. [PMID: 10696147] [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: 02/15/2023]
Abstract
The expression and pharmacological characterization of neuropeptide Y (NPY) receptors of the Y(1) subtype on cultured hippocampal neurons was reported using radioreceptor assays and immunohistochemical approaches (St-Pierre et al., 1998). The present study aimed to establish the presence of NPY Y(1) receptors on cultured hippocampal astrocytes using similar strategies. Immunocytochemical experiments were carried out using three antisera directed against distinct domains (amino acids sequence 185-203, 198-213 and 355-382) of the Y(1) receptor. Double-labeling experiments and confocal microscopy with these Y(1) receptor antisera demonstrated their recognition of the same sub-population (20%) of GFAP-positive astrocytes in culture. The immunostaining seen with all three Y(1) receptor antisera took the form of large irregular clusters distributed throughout cell bodies and processes. Further experiments using radioactive ligands confirmed the presence of NPY receptors on cultured hippocampal astrocytes. Emulsion receptor autoradiography using a newly developed ligand, [(125)I]GR231118 in the presence of PYY, hPP or BIBP3226 (1 microM), pharmacologically established the Y(1) nature of these receptors. Specific [(125)I]GR231118 binding was competed by PYY and the selective Y(1) antagonist BIBP3226 but not by hPP (a Y(4)/Y(5) agonist). Similar autoradiographic labeling patterns were obtained using [(125)I][Leu(31).Pro(34)]PYY (a Y(1)/Y(4)/Y(5) agonist) whereas [(125)I]PYY(3-36) (a Y(2)/Y(5) agonist) failed to generate any specific signal. Hence, rat cultured hippocampal astrocytes express a typical Y(1) receptor without evidence for the presence of Y(2), Y(4) or Y(5) subtypes. These data suggest a preferential regulation by NPY, acting via the Y(1) receptors, of astrocytic function.
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Affiliation(s)
- J A St-Pierre
- Douglas Hospital Research Center, Verdun, Québec, Canada
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Dumont Y, Cadieux A, Doods H, Fournier A, Quirion R. Potent and selective tools to investigate neuropeptide Y receptors in the central and peripheral nervous systems: BIB03304 (Y1) and CGP71683A (Y5). Can J Physiol Pharmacol 2000; 78:116-25. [PMID: 10737674] [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: 02/16/2023]
Abstract
We have evaluated 3 newly developed neuropeptide Y receptor antagonists in various in vitro binding and bioassays: BIBO3304 (Y1), T4[NPY33-36]4 (Y2), and CGP71683A (Y5). In rat brain homogenates, BIBO3304 competes for the same population of [125I][Leu31,Pro34] peptide YY (PYY) binding sites (75%) as BIBP3226, but with a 10 fold greater affinity (IC50 of 0.2 +/- 0.04 nM for BIBO3304 vs. 2.4 +/- 0.07 nM for BIBP3226),while CGP71683A has high affinity for 25% of specific [125I][Leu31,Pro34]PYY binding sites. Both BIBO3304 and CGP71683A (at 1.0 microM) were unable to compete for a significant proportion of specific [125I]PYY3-36/Y2 sites. The purported Y2 antagonist T4[NPY33-36]4 competed against [125I]PYY3-36 binding sites with an affinity of 750 nM. These results were confirmed in HEK 293 cells transfected with either the rat Y1, Y2, Y4, or Y5 receptor cDNA. BIBO3304, but not CGP71683A, competed with high affinity for [125I][Leu31,Pro34]PYY binding sites in HEK 293 cells transfected with the rat Y1 receptor cDNA, whereas the reverse profile was observed upon transfection with the rat Y5 receptor cDNA. Additionally, both molecules were inactive at Y2 and Y4 receptor subtypes expressed in HEK 293 cells. Receptor autoradiographic studies revealed the presence of [125I][Leu31,Pro34]PYY/BIBO3304-insensitive sites in the rat brain as reported previously for BIBP3226. Finally, the selective antagonistic properties of BIBO3304 were demonstrated in a Y1 bioassay (rabbit saphenous vein; pA2 value of 9.04) while being inactive in Y2 (rat vas deferens) and Y4 (rat colon) bioassays. These results confirm the high affinity and selectivity of BIBO3304 and CGP71683A for the Y1 and Y5 receptor subtypes, respectively, while the purported Y2 antagonist, T4[NPY33-36]4 possesses rather low affinity for this receptor.
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Affiliation(s)
- Y Dumont
- Douglas Hospital Research Centre, Department of Psychiatry, McGill University, Verdun, QC, Canada
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Dumont Y, Jacques D, St-Pierre JA, Tong Y, Parker R, Herzog H, Quirion R. Chapter IX Neuropeptide Y, peptide YY and pancreatic polypeptide receptor proteins and mRNAs in mammalian brains. Handbook of Chemical Neuroanatomy 2000. [DOI: 10.1016/s0924-8196(00)80011-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Abstract
Neuropeptide Y (NPY) is widely distributed throughout the central nervous system (CNS) and is one of the most conserved peptides in evolution, suggesting an important role in the regulation of basic physiological functions, including learning and memory. In addition, experimental studies have suggested that NPY, together with its receptors, may have a direct implication in several pathological disorders, including epilepsy/seizure. NPY-like immunoreactivity and NPY receptors have been shown to be present throughout the brain, but is concentrated in the hippocampus. The hippocampal formation has been repeatedly implicated in the modulation of cognition, as well as the pathogenesis of seizure. This review will concentrate on the hippocampal distribution of NPY, its receptors and the putative role played by this peptide in seizure, together with the regulation of cognitive function associated with learning and memory.
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Affiliation(s)
- J P Redrobe
- Douglas Hospital Research Centre, Department of Psychiatry and Neurology, McGill University, 6875 Blvd. LaSalle, Verdun, QC, Canada
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