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Guerinot C, Malige M, Charbonnel N, Malosse K, Jouffret L, Taillefumier C, Roy O, Forestier C, Faure S. Design of Triazolium-Grafted Peptidomimetic Macrocycles with Facial Amphipathicity to Target Pathogenic Bacteria. Org Lett 2024. [PMID: 38709636 DOI: 10.1021/acs.orglett.4c01149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Access to 1,2,3-triazolium-grafted peptoid macrocycles was developed by macrocyclization and multivalent postmodification of linear peptoid oligomers carrying an alternance of benzylic and propargyl groups as side chains. X-ray analysis and NMR studies revealed a conformational preference for constrained hairpin-shaped structures leading to the facial amphipathic character of these macrocycles. A preliminary evaluation showed the antimicrobial activities of these new cationic amphipathic architectures.
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Affiliation(s)
- Cassandra Guerinot
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
| | - Mélodie Malige
- Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France
| | - Nicolas Charbonnel
- Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France
| | - Killian Malosse
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
| | - Laurent Jouffret
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
| | - Claude Taillefumier
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
| | - Olivier Roy
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
| | | | - Sophie Faure
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France
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Kaur M, Miquel S, Ollivier-Nakusi L, Thoral C, Vareille-Delarbre M, Bekirian C, d'Enfert C, Fontaine T, Roget K, Forestier C. Elemental sulfur enhances the anti-fungal effect of Lacticaseibacillus rhamnosus Lcr35. Microbes Infect 2024; 26:105286. [PMID: 38160785 DOI: 10.1016/j.micinf.2023.105286] [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: 09/20/2023] [Revised: 12/21/2023] [Accepted: 12/26/2023] [Indexed: 01/03/2024]
Abstract
Lacticaseibacillus rhamnosus Lcr35 is a well-known bacterial strain whose efficiency in preventing recurrent vulvovaginal candidiasis has been largely demonstrated in clinical trials. The presence of sodium thiosulfate (STS) has been shown to enhance its ability to inhibit the growth of Candida albicans strains. In this study, we confirmed that Lcr35 has a fungicidal effect not only on the planktonic form of C. albicans but also on other life forms such as hypha and biofilm. Transcriptomic analysis showed that the presence of C. albicans induced a metabolic adaptation of Lcr35 potentially associated with a competitive advantage over yeast cells. However, STS alone had no impact on the global gene expression of Lcr35, which is not in favor of the involvement of an enzymatic transformation of STS. Comparative HPLC and gas chromatography-mass spectrometry analysis of the organic phase from cell-free supernatant (CFS) fractions obtained from Lcr35 cultures performed in the presence and absence of STS identified elemental sulfur (S0) in the samples initially containing STS. In addition, the anti-Candida activity of CFS from STS-containing cultures was shown to be pH-dependent and occurred at acidic pH lower than 5. We next investigated the antifungal activity of lactic acid and acetic acid, the two main organic acids produced by lactobacilli. The two molecules affected the viability of C. albicans but only at pH 3.5 and in a dose-dependent manner, an antifungal effect that was enhanced in samples containing STS in which the thiosulfate was decomposed into S0. In conclusion, the use of STS as an excipient in the manufacturing process of Lcr35 exerted a dual action since the production of organic acids by Lcr35 facilitates the decomposition of thiosulfate into S0, thereby enhancing the bacteria's own anti-fungal effect.
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Affiliation(s)
- Manjyot Kaur
- NEXBIOME Therapeutics, 22 Allée Alan Turing, 63000 Clermont-Ferrand, France; Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France
| | - Sylvie Miquel
- Université Clermont Auvergne, CNRS, LMGE, F-63000 Clermont-Ferrand, France.
| | | | - Claudia Thoral
- NEXBIOME Therapeutics, 22 Allée Alan Turing, 63000 Clermont-Ferrand, France
| | | | - Clara Bekirian
- Institut Pasteur, Université Paris Cité, INRAE USC 2019, Unité Biologie et Pathogénicité Fongiques, 25, rue du Docteur Roux, 75015 Paris, France
| | - Christophe d'Enfert
- Institut Pasteur, Université Paris Cité, INRAE USC 2019, Unité Biologie et Pathogénicité Fongiques, 25, rue du Docteur Roux, 75015 Paris, France
| | - Thierry Fontaine
- Institut Pasteur, Université Paris Cité, INRAE USC 2019, Unité Biologie et Pathogénicité Fongiques, 25, rue du Docteur Roux, 75015 Paris, France
| | - Karine Roget
- NEXBIOME Therapeutics, 22 Allée Alan Turing, 63000 Clermont-Ferrand, France
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De K, Aisenbrey C, Haldar J, Faure S, Forestier C, Charbonnel N, Bechinger B. Biophysical investigations of antimicrobial peptide mimics for mechanistic studies. Biophys J 2023; 122:368a. [PMID: 36783868 DOI: 10.1016/j.bpj.2022.11.2030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Affiliation(s)
- Kathakali De
- Institut de Chimie, UMR 7177, University of Strasbourg, Strasbourg, France
| | | | - Jayanta Haldar
- New Chemistry Unit and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
| | - Sophie Faure
- Institut de Chimie de Clermont-Ferrand UMR 6296, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Christiane Forestier
- Laboratoire Microorganismes: Génome Environnement, UMR 6023, CNRS Université Clermont Auvergne, Clermont-Ferrand, France
| | - Nicolas Charbonnel
- Laboratoire Microorganismes: Génome Environnement, UMR 6023, CNRS Université Clermont Auvergne, Clermont-Ferrand, France
| | - Burkhard Bechinger
- Institut de Chimie, UMR 7177, University of Strasbourg, Strasbourg, France
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Hennequin C, Forestier C, Traore O, Debroas D, Bricheux G. Plasmidome analysis of a hospital effluent biofilm: Status of antibiotic resistance. Plasmid 2022; 122:102638. [PMID: 35691511 DOI: 10.1016/j.plasmid.2022.102638] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 11/30/2022]
Abstract
Plasmids are widely involved in the dissemination of characteristics within bacterial communities. Their genomic content can be assessed by high-throughput sequencing of the whole plasmid fraction of an environment, the plasmidome. In this study, we analyzed the plasmidome of a biofilm formed in the effluents of the teaching hospital of Clermont-Ferrand (France). Our analysis discovered >350 new complete plasmids, with a length ranging from 1219 to 40,193 bp. Forty-two plasmid incompatibility (Inc) groups were found among all the plasmid contigs. Ten large plasmids, described here in detail, were reconstructed from plasmid contigs, seven of which carried antibiotic resistance genes. Four plasmids potentially confer resistance to numerous families of antibiotics, including carbapenems, aminoglycosides, colistin, and chloramphenicol. Most of these plasmids were affiliated to Proteobacteria, a phylum of Gram-negative bacteria. This study therefore illustrates the composition of an environmental mixed biofilm in terms of plasmids and antibiotic resistance genes.
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Affiliation(s)
- Claire Hennequin
- CHU Clermont-Ferrand, Service de Bactériologie Clinique, 58 rue Montalembert, 63000 Clermont-Ferrand, France; Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France; Laboratoire Microorganismes: Génome et Environnement, Campus Universitaire des Cézeaux, TSA 60026 - CS 60026, 1, impasse Amélie Murat, 63178 Aubière, France
| | - Christiane Forestier
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Ousmane Traore
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Didier Debroas
- Laboratoire Microorganismes: Génome et Environnement, Campus Universitaire des Cézeaux, TSA 60026 - CS 60026, 1, impasse Amélie Murat, 63178 Aubière, France
| | - Geneviève Bricheux
- Laboratoire Microorganismes: Génome et Environnement, Campus Universitaire des Cézeaux, TSA 60026 - CS 60026, 1, impasse Amélie Murat, 63178 Aubière, France.
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Bord S, Dernat S, Ouillon L, René-Martellet M, Vourc'h G, Lesens O, Forestier C, Lebert I. Tick ecology and Lyme borreliosis prevention: A regional survey of pharmacists’ knowledge in Auvergne-Rhône-Alpes, France. Ticks Tick Borne Dis 2022; 13:101932. [DOI: 10.1016/j.ttbdis.2022.101932] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 02/18/2022] [Accepted: 02/22/2022] [Indexed: 12/14/2022]
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Gritsch L, Granel H, Charbonnel N, Jallot E, Wittrant Y, Forestier C, Lao J. Tailored therapeutic release from polycaprolactone-silica hybrids for the treatment of osteomyelitis: antibiotic rifampicin and osteogenic silicates. Biomater Sci 2022; 10:1936-1951. [PMID: 35258044 DOI: 10.1039/d1bm02015c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The treatment of osteomyelitis, a destructive inflammatory process caused by bacterial infections to bone tissue, is one of the most critical challenges of orthopedics and bone regenerative medicine. The standard treatment consists of intense antibiotic therapies combined with tissue surgical debridement and the application of a bone defect filler material. Unfortunately, commercially available candidates, such as gentamicin-impregnated polymethylmethacrylate cements, possess very poor pharmacokinetics (i.e., 24 hours burst release) and little to no regenerative potential. Fostered by the intrinsic limitations associated with conventional treatments, alternative osteostimulative biomaterials with local drug delivery have recently started to emerge. In this study, we propose the use of a polycaprolactone-silica sol-gel hybrid material as carrier for the delivery of rifampicin, an RNA-polymerase blocker often used to treat bone infections, and of osteostimulative silicate ions. The release of therapeutic agents from the material is dual, offering two separate and simultaneous effects, and decoupled, meaning that the kinetics of rifampicin and silicate releases are independent from each other. A series of hybrid formulations with increasing amounts of rifampicin was prepared. The antibiotic loading efficacy, as well as the release profiles of rifampicin and silicates were measured. The characterization of cell viability and differentiation of rat primary osteoblasts and antibacterial performance were also performed. Gram-positive Staphylococcus aureus and Gram-negative Pseudomonas aeruginosa and Escherichia coli were selected due to their high occurrence in bone infections. Results confirmed that rifampicin can be successfully loaded within the hybrids without significant degradation and that it is possible to tailor the antibiotic release according to need. Once in a physiological environment, the rapid release of silicates was associated with optimal cell proliferation and the overexpression of osteoblastic differentiation. Simultaneously, rifampicin is delivered over the course of several weeks with significant inhibition of all tested strains. In particular, the materials caused a growth reduction of 7-10 orders of magnitude in Staphylococcus aureus, the major strain responsible for osteomyelitis worldwide. Our data strongly suggest that PCL/silica hybrids are a very promising candidate to develop bone fillers with superior biological performance compared to currently available options. Thanks to their unique synthesis route and their dual tailored release they can promote bone regeneration while reducing the risk of infection for several weeks upon implantation.
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Affiliation(s)
- Lukas Gritsch
- Laboratoire de Physique de Clermont, UMR CNRS 6533, Université Clermont Auvergne, 4 avenue Blaise Pascal, 63178 Aubière, France.
| | - Henri Granel
- Unité de Nutrition Humaine UMR 1019 INRAE, Université Clermont Auvergne, 28 place Henri-Dunant, 63001 Clermont-Ferrand, France
| | - Nicolas Charbonnel
- Université Clermont Auvergne, CNRS, LMGE, 63000 Clermont-Ferrand, France
| | - Edouard Jallot
- Laboratoire de Physique de Clermont, UMR CNRS 6533, Université Clermont Auvergne, 4 avenue Blaise Pascal, 63178 Aubière, France.
| | - Yohann Wittrant
- Unité de Nutrition Humaine UMR 1019 INRAE, Université Clermont Auvergne, 28 place Henri-Dunant, 63001 Clermont-Ferrand, France
| | | | - Jonathan Lao
- Laboratoire de Physique de Clermont, UMR CNRS 6533, Université Clermont Auvergne, 4 avenue Blaise Pascal, 63178 Aubière, France.
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Shyam R, Forestier C, Charbonnel N, Roy O, Taillefumier C, Faure S. Solution‐Phase Synthesis of Backbone‐Constrained Cationic Peptoid Hexamers with Antibacterial and Anti‐Biofilm Activities. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101155] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Radhe Shyam
- Université Clermont Auvergne, Clermont Auvergne INP CNRS, ICCF F-63000 Clermont-Ferrand France
| | | | | | - Olivier Roy
- Université Clermont Auvergne, Clermont Auvergne INP CNRS, ICCF F-63000 Clermont-Ferrand France
| | - Claude Taillefumier
- Université Clermont Auvergne, Clermont Auvergne INP CNRS, ICCF F-63000 Clermont-Ferrand France
| | - Sophie Faure
- Université Clermont Auvergne, Clermont Auvergne INP CNRS, ICCF F-63000 Clermont-Ferrand France
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Chartogne M, Leclercq A, Beaune B, Boyas S, Forestier C, Martin T, Thomas-Ollivier V, Landry S, Bourgeois H, Cojocarasu O, Pialoux V, Zanna O, Messonnier LA, Rahmani A, Morel B. Building a biopsychosocial model of cancer-related fatigue: the BIOCARE FActory cohort study protocol. BMC Cancer 2021; 21:1140. [PMID: 34688272 PMCID: PMC8542307 DOI: 10.1186/s12885-021-08831-3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 10/04/2021] [Indexed: 12/03/2022] Open
Abstract
Background Cancer-related fatigue (CRF) is the most common side effect of cancer and cancer treatment. CRF prevalence is up to 50% in breast cancer patients and can continue several years after cancer remission. This persistent subjective sense of exhaustion is multifactorial. Numerous parameters have been evidenced to be related to CRF across biological, physical, psychological, social and/or behavioral dimensions. Although CRF has been studied for many years, the majority of previous studies focused on only one dimension, i.e., physical function. Moreover, few studies investigated CRF longitudinally with repeated measures. These are the two main obstacles that limit the understanding of CRF mechanisms. The purpose of this study is to create a biopsychosocial model of CRF with simultaneous and longitudinal anthropometric, clinical, biological, physical, psychological and sociological parameters. Methods BIOCARE FActory is a multicentric prospective study that will consist of an 18-month follow-up of 200 women diagnosed with breast cancer. Four visits will be scheduled at diagnosis, after treatments, and 12 and 18 months after diagnosis. The same procedure will be followed for each visit. Each session will be composed of anthropometric data collection, a semi-structured interview, cognitive tests, postural control tests, neuromuscular fatigability tests and a cardiorespiratory fitness test. Clinical and biological data will be collected during medical follow-ups. Participants will also complete questionnaires to assess psychological aspects and quality of life and wear an actigraphy device. Using a structural equation modeling analysis (SEM), collected data will build a biopsychosocial model of CRF, including the physiological, biological, psychological, behavioral and social dimensions of CRF. Discussion This study aims to highlight the dynamics of CRF and its correlates from diagnosis to post treatment. SEM analysis could examine some relations between potential mechanisms and CRF. Thus, the biopsychosocial model will contribute to a better understanding of CRF and its underlying mechanisms from diagnosis to the aftermaths of cancer and its treatments. Trial registration This study is registered at ClinicalTrials.gov (NCT04391543), May 2020.
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Affiliation(s)
- M Chartogne
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France.
| | - A Leclercq
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France
| | - B Beaune
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France
| | - S Boyas
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France
| | - C Forestier
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France
| | - T Martin
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France
| | - V Thomas-Ollivier
- Nantes Université, Movement - Interactions - Performance, MIP, 4334, Nantes, EA, France
| | - S Landry
- Elsan-Clinique Victor Hugo, Centre Jean Bernard, Le Mans, France
| | - H Bourgeois
- Elsan-Clinique Victor Hugo, Centre Jean Bernard, Le Mans, France
| | - O Cojocarasu
- Centre Hospitalier Le Mans (CHM), Le Mans, France
| | - V Pialoux
- Univ Lyon, University Claude Bernard Lyon 1, Inter-University Laboratory of Human Movement Biology, Team Atherosclerosis Thrombosis & Physical Activity, EA7424, Lyon, France
| | - O Zanna
- Le Mans Université, VIPS2, EA4636, Le Mans, France
| | - L A Messonnier
- Laboratoire Interuniversitaire de Biologie de la Motricité, Univ. Savoie Mont Blanc, 7424, F-73000, Chambéry, EA, France
| | - A Rahmani
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France
| | - B Morel
- Le Mans Université, Movement - Interactions - Performance, MIP, 4334, F-72000, Le Mans, EA, France.,Laboratoire Interuniversitaire de Biologie de la Motricité, Univ. Savoie Mont Blanc, 7424, F-73000, Chambéry, EA, France
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Jacobs A, Renaudin G, Charbonnel N, Nedelec JM, Forestier C, Descamps S. Copper-Doped Biphasic Calcium Phosphate Powders: Dopant Release, Cytotoxicity and Antibacterial Properties. Materials (Basel) 2021; 14:ma14092393. [PMID: 34064435 PMCID: PMC8124198 DOI: 10.3390/ma14092393] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 04/19/2021] [Accepted: 05/02/2021] [Indexed: 11/25/2022]
Abstract
Cytotoxicity and antibacterial properties associated with the dopant release of Cu-doped Biphasic Calcium Phosphate (BCP) powders, mainly composed of hydroxyapatite mixed with β-tricalcium phosphate powders, were investigated. Twelve BCP ceramics were synthesized at three different sintering temperatures (600 °C, 900 °C and 1200 °C) and four copper doping rates (x = 0.0, 0.05, 0.10 and 0.20, corresponding to the stoichiometric amount of copper in Ca10Cux(PO4)6(OH)2-2xO2x). Cytotoxicity assessments of Cu-doped BCP powders, using MTT assay with human-Mesenchymal Stem Cells (h-MSCs), indicated no cytotoxicity and the release of less than 12 ppm of copper into the biological medium. The antibacterial activity of the powders was determined against both Gram-positive (methicillin-sensitive (MS) and methicillin resistant (MR) Staphylococcus aureus) and Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacteria. The Cu-doped biomaterials exhibited a strong antibacterial activity against MSSA, MRSA and E. coli, releasing approximatively 2.5 ppm after 24 h, whereas 10 ppm were required to induce an antibacterial effect against P. aeruginosa. This study also demonstrated that the culture medium used during experiments can directly impact the antibacterial effect observed; only 4 ppm of Cu2+ were effective for killing all the bacteria in a 1:500 diluted TS medium, whereas 20 ppm were necessary to achieve the same result in a rich, non-diluted standard marrow cell culture medium.
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Affiliation(s)
- Aurélie Jacobs
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France; (A.J.); (J.-M.N.)
| | - Guillaume Renaudin
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France; (A.J.); (J.-M.N.)
- Correspondence:
| | - Nicolas Charbonnel
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Genome et Environnement, F-63000 Clermont-Ferrand, France; (N.C.); (C.F.)
| | - Jean-Marie Nedelec
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France; (A.J.); (J.-M.N.)
| | - Christiane Forestier
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Genome et Environnement, F-63000 Clermont-Ferrand, France; (N.C.); (C.F.)
| | - Stéphane Descamps
- Université Clermont Auvergne, Clermont Auvergne INP, CNRS, CHU Clermont, ICCF, F-63000 Clermont-Ferrand, France;
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Aumeran C, Mottet-Auselo B, Forestier C, Nana PA, Hennequin C, Robin F, Souweine B, Traoré O, Lautrette A. A prospective study on the pathogenesis of catheter-associated bacteriuria in critically ill patients. BMC Microbiol 2021; 21:86. [PMID: 33752594 PMCID: PMC7983228 DOI: 10.1186/s12866-021-02147-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/08/2021] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Updating the pathogenesis of catheter-associated bacteriuria (CA-bacteriuria) in the intensive care unit (ICU) is needed to adapt prevention strategies. Our aim was to determine whether the main pathway of CA-bacteriuria in ICU patients was endoluminal or exoluminal. In a prospective study, quantitative urine cultures were sampled from catheter sampling sites, collector bags and the catheter outer surface near the meatus from days 1 to 15 after catheterization. The endoluminal pathway was CA-bacteriuria (defined as 102 CFU/mL) first in collector bags and then in catheters. The exoluminal pathway was CA-bacteriuria first in catheters, on day 1 in early cases and after day 1 in late cases. RESULTS Of 64 included patients, 20 had CA-bacteriuria. Means of catheterization days and incidence density were 6.81 days and 55.2/1000 catheter-days. Of 26 microorganisms identified, 12 (46.2%) were Gram positive cocci, 8 (30.8%) Gram negative bacilli and 6 yeasts. Three (11.5%) CA-bacteriuria were endoluminal and 23 (88.5%) exoluminal, of which 10 (38.5%) were early and 13 (50%) late. Molecular comparison confirmed culture findings. A quality audit showed good compliance with guidelines. CONCLUSION The exoluminal pathway of CA-bacteriuria in ICU patients predominated and surprisingly occurred early despite good implementation of guidelines. This finding should be considered in guidelines for prevention of CA-bacteriuria.
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Affiliation(s)
- Claire Aumeran
- Infection Control Department, 3IHP, CHU Clermont-Ferrand, 63000, Clermont-Ferrand, France.
- Université Clermont Auvergne, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', F-63000, Clermont-Ferrand, France.
- Service d'Hygiène Hospitalière, Hôpital Gabriel Montpied, 58 Rue Montalembert, 63003, Clermont-Ferrand Cedex 1, France.
| | - Benoit Mottet-Auselo
- Infection Control Department, 3IHP, CHU Clermont-Ferrand, 63000, Clermont-Ferrand, France
| | - Christiane Forestier
- Université Clermont Auvergne, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', F-63000, Clermont-Ferrand, France
| | - Paul-Alain Nana
- Université Clermont Auvergne, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', F-63000, Clermont-Ferrand, France
| | - Claire Hennequin
- Université Clermont Auvergne, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', F-63000, Clermont-Ferrand, France
- Bacteriology Department, 3IHP, CHU Clermont-Ferrand, 63000, Clermont-Ferrand, France
| | - Frédéric Robin
- Bacteriology Department, 3IHP, CHU Clermont-Ferrand, 63000, Clermont-Ferrand, France
- Université Clermont Auvergne, UMR INSERM 1071 'Laboratoire Microbe intestin inflammation et Susceptibilité de l'Hôte (M2ISH)', USC INRA2018, F-63000, Clermont-Ferrand, France
- Laboratoire associé Résistance des Entérobactéries BLSE/Céphalosporinases, Centre National de Référence Résistance aux Antibiotiques, Clermont-Ferrand, France
| | - Bertrand Souweine
- Université Clermont Auvergne, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', F-63000, Clermont-Ferrand, France
- Intensive Care Medicine, CHU Clermont-Ferrand, 63000, Clermont-Ferrand, France
| | - Ousmane Traoré
- Infection Control Department, 3IHP, CHU Clermont-Ferrand, 63000, Clermont-Ferrand, France
- Université Clermont Auvergne, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', F-63000, Clermont-Ferrand, France
| | - Alexandre Lautrette
- Université Clermont Auvergne, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', F-63000, Clermont-Ferrand, France
- Intensive Care Medicine, CHU Clermont-Ferrand, 63000, Clermont-Ferrand, France
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11
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Jacobs A, Renaudin G, Forestier C, Nedelec JM, Descamps S. Biological properties of copper-doped biomaterials for orthopedic applications: A review of antibacterial, angiogenic and osteogenic aspects. Acta Biomater 2020; 117:21-39. [PMID: 33007487 DOI: 10.1016/j.actbio.2020.09.044] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 09/17/2020] [Accepted: 09/21/2020] [Indexed: 12/13/2022]
Abstract
Copper is an essential trace element required for human life, and is involved in several physiological mechanisms. Today researchers have found and confirmed that Cu has biological properties which are particularly useful for orthopedic biomaterials applications such as implant coatings or biodegradable filler bone substitutes. Indeed, Cu exhibits antibacterial functions, provides angiogenic ability and favors osteogenesis; these represent major key points for ideal biomaterial integration and the healing process that follows. The antibacterial performances of copper-doped biomaterials present an interesting alternative to the massive use of prophylactic antibiotics and help to limit the development of antibiotic resistance. By stimulating blood vessel growth and new bone formation, copper contributes to the improved bio-integration of biomaterials. This review describes the bio-functional advantages offered by Cu and focuses on the antibacterial, angiogenic and osteogenic properties of Cu-doped biomaterials with potential for orthopedic applications.
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Dausset C, Bornes S, Miquel S, Kondjoyan N, Angenieux M, Nakusi L, Veisseire P, Alaterre E, Bermúdez-Humarán LG, Langella P, Engel E, Forestier C, Nivoliez A. Identification of sulfur components enhancing the anti-Candida effect of Lactobacillus rhamnosus Lcr35. Sci Rep 2020; 10:17074. [PMID: 33051479 PMCID: PMC7553951 DOI: 10.1038/s41598-020-74027-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 05/22/2020] [Accepted: 07/30/2020] [Indexed: 01/09/2023] Open
Abstract
GYNOPHILUS (Lcr REGENERANS) is a live biotherapeutic product (LBP) aimed at restoring the vaginal microbiome and contains the live biotherapeutic microorganism Lactobacillus rhamnosus Lcr35. In this study, the LBP formulation and manufacturing process significantly enhanced the anti-Candida activity of L. rhamnosus Lcr35, with a complete loss of viability of the yeast after 48 h of coincubation. Sodium thiosulfate (STS), one excipient of the product, was used as a potentiator of the anti-Candida spp. activity of Lactobacilli. This contact-independent phenomenon induced fungal cell disturbances, as observed by electron microscopy observations. Nonverbal sensory experiments showed clear odor dissimilarities between cocultures of L. rhamnosus Lcr35 and C. albicans in the presence and absence of STS, suggesting an impact of odor-active metabolites. A volatolomic approach allowed the identification of six odor-active compounds, including one sulfur compound that was identified as S-methyl thioacetate (MTA). MTA was associated with the antifungal effect of Lcr35, and its functional link was established in vitro. We show for the first time that the LBP GYNOPHILUS, which is a highly active product in the reduction of vulvovaginal candidiasis, requires the presence of a sulfur compound to fully achieve its antifungal effect.
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Affiliation(s)
- Caroline Dausset
- Research and Development Department, BIOSE, 24 avenue Georges Pompidou, 15000, Aurillac, France. .,Micalis Institute, INRAE, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France. .,Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement, 63000, Clermont-Ferrand, France.
| | - Stéphanie Bornes
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMRF, 15000, Aurillac, France
| | - Sylvie Miquel
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement, 63000, Clermont-Ferrand, France
| | - Nathalie Kondjoyan
- INRAE, UR370 QuaPA, Microcontaminants, Aroma & Separation Science Group (MASS), 63123, Saint-Genès-Champanelle, France
| | - Magaly Angenieux
- INRAE, UR370 QuaPA, Microcontaminants, Aroma & Separation Science Group (MASS), 63123, Saint-Genès-Champanelle, France
| | - Laurence Nakusi
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement, 63000, Clermont-Ferrand, France
| | - Philippe Veisseire
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMRF, 15000, Aurillac, France
| | - Elina Alaterre
- Research and Development Department, BIOSE, 24 avenue Georges Pompidou, 15000, Aurillac, France.,HORIBA ABX SAS, Parc Euromédecine, Rue du Caducée, BP 7290, 34184, Montpellier Cedex 4, France
| | - Luis G Bermúdez-Humarán
- Micalis Institute, INRAE, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - Philippe Langella
- Micalis Institute, INRAE, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - Erwan Engel
- INRAE, UR370 QuaPA, Microcontaminants, Aroma & Separation Science Group (MASS), 63123, Saint-Genès-Champanelle, France
| | - Christiane Forestier
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement, 63000, Clermont-Ferrand, France
| | - Adrien Nivoliez
- Research and Development Department, BIOSE, 24 avenue Georges Pompidou, 15000, Aurillac, France
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Fakhfakh S, Pouliquen C, Campagna J, Loverde K, Treacy P, Maubon T, Rybikowski S, Cambon S, Nguyen L, Deguibert J, Laurent M, Aveno J, Bokor E, Demontis C, Forestier C, Bereni F, Galland J, Montoya C, Mejri I, Cea C, Faucher M, Mokart D, Pignot G, Walz J. Patient care pathway hypnosedation in endo urology: An innovative alternative to general anesthesia. EUR UROL SUPPL 2020. [DOI: 10.1016/s2666-1683(20)34225-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Abstract
Resilience is the capacity of systems to recover their initial state or functions after a disturbance. The concepts of resilience and resistance are complementary in ecology and both represent different aspects of the stability of ecosystems. However, antibiotic resilience is not used in clinical bacteriology whereas antibiotic resistance is a recognized major problem. To join the fields of ecology and clinical bacteriology, we first review the resilience concept from ecology, socio-ecological systems and microbiology where it is widely developed. We then review resilience-related concepts in microbiology, including bacterial tolerance and persistence, phenotypic heterogeneity and collective tolerance and resistance. We discuss how antibiotic resilience could be defined and argue that the use of this concept largely relies on its experimental measure and its clinical relevance. We review indicators in microbiology which could be used to reflect antibiotic resilience and used as valuable indicators to anticipate the capacity of bacteria to recover from antibiotic treatments.
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Affiliation(s)
- Gabriel Carvalho
- Université Clermont Auvergne, Irstea, UR LISC, Centre de Clermont-Ferrand, 9 Avenue Blaise Pascal CS 20085, F-63178, Aubière, France
| | | | - Jean-Denis Mathias
- Université Clermont Auvergne, Irstea, UR LISC, Centre de Clermont-Ferrand, 9 Avenue Blaise Pascal CS 20085, F-63178, Aubière, France
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15
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Marquès C, Collin V, Franceschi C, Charbonnel N, Chatellier S, Forestier C. Fosfomycin and Staphylococcus aureus: transcriptomic approach to assess effect on biofilm, and fate of unattached cells. J Antibiot (Tokyo) 2019; 73:91-100. [PMID: 31705133 DOI: 10.1038/s41429-019-0256-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 08/08/2019] [Accepted: 10/14/2019] [Indexed: 11/09/2022]
Abstract
Interest has been rekindled in the old antibiotic fosfomycin, partly because of its ability to penetrate biofilm. Using a transcriptomic approach, we investigated the modifications induced by fosfomycin in sessile cells of a clinical Staphylococcus aureus isolated from a device-associated infection. Cells still able to form biofilm after 4 h of incubation in the presence of subinhibitory concentrations of fosfomycin and cells from 24-h-old biofilm later submitted to fosfomycin had 6.77% and 9.41%, respectively, of differentially expressed genes compared with their antibiotic-free control. Fosfomycin induced mostly downregulation of genes assigned to nucleotide, amino acid and carbohydrate transport, and metabolism. Adhesins and capsular biosynthesis proteins encoding genes were downregulated in fosfomycin-grown biofilm, whereas the murein hydrolase regulator lgrA and a D-lactate dehydrogenase-encoding gene were upregulated. In fosfomycin-treated biofilm, the expression of genes encoding adhesins, the cell wall biosynthesis protein ScdA, and to a lesser extent the fosfomycin target MurA was also decreased. Unattached cells surrounding fosfomycin-grown biofilm showed greater ability to form aggregates than their counterparts obtained without fosfomycin. Reducing their global metabolism and lowering cell wall turnover would allow some S. aureus cells to grow in biofilm despite fosfomycin stress while promoting hyperadherent phenotype in the vicinity of the fosfomycin-treated biofilm.
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Affiliation(s)
- Claire Marquès
- bioMérieux SA, 38390, La Balme les Grottes, France.,Laboratoire des Microorganismes, Génome et Environnement, UMR CNRS 6023-Université Clermont Auvergne, 63000, Clermont-Ferrand, France
| | | | | | - Nicolas Charbonnel
- Laboratoire des Microorganismes, Génome et Environnement, UMR CNRS 6023-Université Clermont Auvergne, 63000, Clermont-Ferrand, France
| | | | - Christiane Forestier
- Laboratoire des Microorganismes, Génome et Environnement, UMR CNRS 6023-Université Clermont Auvergne, 63000, Clermont-Ferrand, France.
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16
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Chouhab Y, Lefebvre T, Forestier C, Parsis P, Martinez M. Analyse des courriers de plainte adressés au service d’urgence d’un centre hospitalier général. Ann Fr Med Urgence 2019. [DOI: 10.3166/afmu-2019-0176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Objectif : L’objectif principal de notre travail était d’analyser les courriers de plainte (CP) adressés à un service d’urgence (SU). L’objectif secondaire était de déterminer s’il existait une corrélation entre CP et temporalité de passage au SU.
Matériel et méthodes : Étude rétrospective monocentrique sur six ans portant sur les CP concernant les prises en charge en SU.
Résultats : Quatre-vingt-un CP ont été analysés, la moyenne annuelle et l’incidence étaient de 13,5 CP/an et de 5,5 CP/ 10 000 passages. L’incidence était de 3,5 CP/10 000 passages pour les enfants vs 6,1 CP/10 000 passages pour les adultes (p = 0,11). Le plaignant était la famille dans 44 CP (55 %) et le patient dans 34 CP (42 %). Il n’y avait pas de différence significative entre le jour et la nuit (5,7 CP/10 000 vs 4,8 CP/ 10 000 passages ; p = 0,57) ni entre horaires de garde et horaires hors garde (5,6 CP/10 000 vs 5,2 CP/10 000 passages ; p = 0,78). Nous avons dénombré 133 doléances, avec une cause médicale dans 64 CP (48 %), une cause organisationnelle dans 44 CP (33 %), une cause relationnelle dans 25 CP (19 %). Une indemnisation financière a été demandée dans 13 CP (16 %) et a été accordée pour deux dossiers (2 %). Aucun CP n’a entraîné de poursuite en justice.
Conclusion : L’incidence des CP de notre SU reste dans la moyenne basse des données retrouvées au niveau national et sans relation avec la temporalité du passage. L’analyse des CP permet d’améliorer la qualité de la prise en charge et de proposer des mesures correctives en relation avec la commission des usagers.
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Guilhen C, Miquel S, Charbonnel N, Joseph L, Carrier G, Forestier C, Balestrino D. Colonization and immune modulation properties of Klebsiella pneumoniae biofilm-dispersed cells. NPJ Biofilms Microbiomes 2019; 5:25. [PMID: 31583108 PMCID: PMC6760147 DOI: 10.1038/s41522-019-0098-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [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: 10/02/2018] [Accepted: 08/12/2019] [Indexed: 02/07/2023] Open
Abstract
Biofilm-dispersal is a key determinant for further dissemination of biofilm-embedded bacteria. Recent evidence indicates that biofilm-dispersed bacteria have transcriptional features different from those of both biofilm and planktonic bacteria. In this study, the in vitro and in vivo phenotypic properties of Klebsiella pneumoniae cells spontaneously dispersed from biofilm were compared with those of planktonic and sessile cells. Biofilm-dispersed cells, whose growth rate was the same as that of exponential planktonic bacteria but significantly higher than those of sessile and stationary planktonic forms, colonized both abiotic and biotic surfaces more efficiently than their planktonic counterparts regardless of their initial adhesion capabilities. Microscopy studies suggested that dispersed bacteria initiate formation of microcolonies more rapidly than planktonic bacteria. In addition, dispersed cells have both a higher engulfment rate and better survival/multiplication inside macrophages than planktonic cells and sessile cells. In an in vivo murine pneumonia model, the bacterial load in mice lungs infected with biofilm-dispersed bacteria was similar at 6, 24 and 48 h after infection to that of mice lungs infected with planktonic or sessile bacteria. However, biofilm-dispersed and sessile bacteria trend to elicit innate immune response in lungs to a lesser extent than planktonic bacteria. Collectively, the findings from this study suggest that the greater ability of K. pneumoniae biofilm-dispersed cells to efficiently achieve surface colonization and to subvert the host immune response confers them substantial advantages in the first steps of the infection process over planktonic bacteria.
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Affiliation(s)
- Cyril Guilhen
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France.,3Present Address: Université de Genève, Centre Médical Universitaire, Département de Physiologie Cellulaire et Métabolisme, Genève, Suisse
| | - Sylvie Miquel
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
| | - Nicolas Charbonnel
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
| | - Laura Joseph
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
| | - Guillaume Carrier
- 2Université Clermont Auvergne, Inserm U1071, USC-INRA 2018, M2iSH, CRNH Auvergne, Clermont-Ferrand, France.,4Present Address: Department of Surgical Oncology, Institut du Cancer de Montpellier, Montpellier, France
| | | | - Damien Balestrino
- 1Université Clermont Auvergne, CNRS 6023, LMGE, Clermont-Ferrand, France
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18
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Nadi A, Boyer D, Charbonnel N, Boukhriss A, Forestier C, Gmouh S. Immobilisation of bacteria onto magnetic nanoparticles for the decolorisation and degradation of azo dyes. IET Nanobiotechnol 2019; 13:144-149. [PMID: 31051444 DOI: 10.1049/iet-nbt.2018.5026] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Azo dyes are widely used in industries and their release in the environment contributes to the pollution of effluents. The authors aim to develop a new eco-friendly water treatment method for the degradation of azo dyes based on in situ magnetic separation and immobilisation of bacterial cells. The immobilisation was achieved using superparamagnetic Fe3O4 nanoparticles and offers the possibility of reusing bacteria by magnetic separation for several degradation cycles. The iron-oxide nanoparticles were synthesised by reverse co-precipitation. The Gram-positive bacteria Bacillus subtilis were immobilised using iron-oxide nanoparticles by adsorption and then separated with an external magnetic field. Transmission electron microscopy observation showed that the particles' diameter was ∼20 nm with a narrow size distribution. Moreover, the iron-oxide nanoparticles were adsorbed onto the surface in order to coat the cells. B. subtilis has proved its ability to decolorise and degrade several azo dyes at different values of pH, with the highest decolorisation rate for Congo red. Furthermore, immobilised cells have a degradation activity similar to that of free cells. The system provided a degradation rate up to 80% and could be reused for seven batch cycles.
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Affiliation(s)
- Ayoub Nadi
- Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont, Ferrand, France
| | - Damien Boyer
- Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont, Ferrand, France
| | - Nicolas Charbonnel
- Biologie Cellulaire Faculté de Pharmacie, Laboratoire de Bactériologie, Université Clermont-Auvergne, 63001 Clermont, Ferrand, France
| | - Aïcha Boukhriss
- Laboratoire REMTEX, ESITH, route d'El jadida, km 8, BP 7731 - Oulfa, Casablanca, Morocco
| | - Christiane Forestier
- Biologie Cellulaire Faculté de Pharmacie, Laboratoire de Bactériologie, Université Clermont-Auvergne, 63001 Clermont, Ferrand, France
| | - Said Gmouh
- Laboratoire LIMAT, Université Hassan II Casablanca, BP 9167 Casablanca, Morocco.
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Ory J, Bricheux G, Robin F, Togola A, Forestier C, Traore O. Biofilms in hospital effluents as a potential crossroads for carbapenemase-encoding strains. Sci Total Environ 2019; 657:7-15. [PMID: 30530220 DOI: 10.1016/j.scitotenv.2018.11.427] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [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: 09/06/2018] [Revised: 11/09/2018] [Accepted: 11/28/2018] [Indexed: 06/09/2023]
Abstract
Bacterial resistance to carbapenem, which is mainly due to the successful dissemination of carbapenemase-encoding genes, has become a major health problem. Few studies have aimed to characterize the level of resistance in the environment, notably in hospital wastewater, which is a likely hotspot for exchange of antibiotic resistance genes. In this work, we looked for the presence of imipenem-resistant bacteria and imipenem in the effluent of the teaching hospital of Clermont-Ferrand, France. Selective growth of bacteria from 14-day old biofilms formed in the pipe sewer showed that 22.1% of the isolates were imipenem-resistant and identified as Aeromonas (n = 23), Pseudomonas (n = 10), Stenotrophomonas (n = 4) and Acinetobacter (n = 1). Fifteen of these strains harbored acquired carbapenemase-encoding genes blaVIM (n = 11), blaOXA-48 (n = 2), blaGES (n = 1), blaNDM (n = 1). All isolates also harbored associated resistances to aminoglycosides, fluoroquinolones and/or tetracyclin. S1-nuclease pulsed-field gel electrophoresis analysis of eight selected isolates showed that four of them harbored one to two plasmids of molecular weight between 48.5 Kb and 194 Kb. In vitro transformation assays evidenced the presence of blaVIM and blaNDM on plasmids with the blaVIM harboring 80 Kb plasmid having conjugative capacity. The predicted environmental concentration of imipenem in the hospital effluent was 3.16 μg/L, suggesting that biofilm bacteria are subjected to sub-MICs of imipenem within the effluent. However, no imipenem molecule was detected in the hospital effluent, probably owing to its instability: in vitro assays indicated that imipenem's biological activity was no longer detectable after 45 h of storage. However, the predictive value of the hazard quotient relative to the development of resistance was >1.0 (HQr = 28.9 ± 1.9), which indicates a possible risk. The presence of carbapenemase-encoding genes in hospital effluent biofilm strains and their ability to transfer are therefore a potential hazard that should not be neglected and points to the need for monitoring antibiotic resistance in hospital wastewater.
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Affiliation(s)
- J Ory
- Université Clermont Auvergne, CNRS, Laboratoire "Microorganismes: Génome et Environnement", F-63000 Clermont-Ferrand, France; Service d'hygiène hospitalière, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - G Bricheux
- Université Clermont Auvergne, CNRS, Laboratoire "Microorganismes: Génome et Environnement", F-63000 Clermont-Ferrand, France
| | - F Robin
- Laboratoire de Bactériologie & CNR de la Résistance aux Antibiotiques, CHU de Clermont-Ferrand, Clermont-Ferrand, France; Université Clermont Auvergne, Inserm, M2ISH, F-63000 Clermont-Ferrand, France
| | - A Togola
- Bureau de recherches géologiques et minières (BRGM), 3 avenue Claude Guillemin, F-45100 Orléans, France
| | - C Forestier
- Université Clermont Auvergne, CNRS, Laboratoire "Microorganismes: Génome et Environnement", F-63000 Clermont-Ferrand, France
| | - O Traore
- Université Clermont Auvergne, CNRS, Laboratoire "Microorganismes: Génome et Environnement", F-63000 Clermont-Ferrand, France; Service d'hygiène hospitalière, CHU de Clermont-Ferrand, Clermont-Ferrand, France.
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Shyam R, Charbonnel N, Job A, Blavignac C, Forestier C, Taillefumier C, Faure S. 1,2,3‐Triazolium‐Based Cationic Amphipathic Peptoid Oligomers Mimicking Antimicrobial Helical Peptides. ChemMedChem 2018; 13:1513-1516. [DOI: 10.1002/cmdc.201800273] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/05/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Radhe Shyam
- Université Clermont Auvergne CNRS, SIGMA Clermont, ICCF 63000 Clermont-Ferrand France
| | | | - Aurélie Job
- Université Clermont Auvergne CNRS, SIGMA Clermont, ICCF 63000 Clermont-Ferrand France
| | - Christelle Blavignac
- Université Clermont Auvergne Centre Imagerie Cellulaire Santé 63000 Clermont-Ferrand France
| | | | - Claude Taillefumier
- Université Clermont Auvergne CNRS, SIGMA Clermont, ICCF 63000 Clermont-Ferrand France
| | - Sophie Faure
- Université Clermont Auvergne CNRS, SIGMA Clermont, ICCF 63000 Clermont-Ferrand France
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21
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Parsis P, Forestier C, Martinez M. Un ptosis unilatéral isolé. Ann Fr Med Urgence 2018. [DOI: 10.3166/afmu-2018-0023] [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: 11/20/2022]
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Carvalho G, Balestrino D, Forestier C, Mathias JD. How do environment-dependent switching rates between susceptible and persister cells affect the dynamics of biofilms faced with antibiotics? NPJ Biofilms Microbiomes 2018; 4:6. [PMID: 29560270 PMCID: PMC5854711 DOI: 10.1038/s41522-018-0049-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 08/10/2017] [Revised: 02/06/2018] [Accepted: 02/09/2018] [Indexed: 01/24/2023] Open
Abstract
Persisters form sub-populations of stress-tolerant cells that play a major role in the capacity of biofilms to survive and recover from disturbances such as antibiotic treatments. The mechanisms of persistence are diverse and influenced by environmental conditions, and persister populations are more heterogeneous than formerly suspected. We used computational modeling to assess the impact of three switching strategies between susceptible and persister cells on the capacity of bacterial biofilms to grow, survive and recover from antibiotic treatments. The strategies tested were: (1) constant switches, (2) substrate-dependent switches and (3) antibiotic-dependent switches. We implemented these strategies in an individual-based biofilm model and simulated antibiotic shocks on virtual biofilms. Because of limited available data on switching rates in the literature, nine parameter sets were assessed for each strategy. Substrate and antibiotic-dependent switches allowed high switching rates without affecting the growth of the biofilms. Compared to substrate-dependent switches, constant and antibiotic-dependent switches were associated with higher proportions of persisters in the top of the biofilms, close to the substrate source, which probably confers a competitive advantage within multi-species biofilms. The constant and substrate-dependent strategies need a compromise between limiting the wake-up and death of persisters during treatments and leaving the persister state fast enough to recover quickly after antibiotic-removal. Overall, the simulations gave new insights into the relationships between the dynamics of persister populations in biofilms and their dynamics of growth, survival and recovery when faced with disturbances.
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Affiliation(s)
- Gabriel Carvalho
- UR LISC Laboratoire d'Ingénierie pour les Systèmes Complexes, Irstea, Aubière, France
| | - Damien Balestrino
- 2LMGE, UMR6023 CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
| | | | - Jean-Denis Mathias
- UR LISC Laboratoire d'Ingénierie pour les Systèmes Complexes, Irstea, Aubière, France
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Lagrafeuille R, Miquel S, Balestrino D, Vareille-Delarbre M, Chain F, Langella P, Forestier C. Opposing effect of Lactobacillus on in vitro Klebsiella pneumoniae in biofilm and in an in vivo intestinal colonisation model. Benef Microbes 2018; 9:87-100. [DOI: 10.3920/bm2017.0002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Beneficial bacteria represent potential sources of therapy, particularly in the battle against antibiotic-resistant pathogens. The Gram-negative bacillus Klebsiella pneumoniae is not only a paradigm of multi-resistant opportunistic pathogen, but it is also able to colonise the human intestine and displays a high capacity to form biofilm. In this study, the anti-biofilm activity of 140 neutralised Lactobacillus supernatants was assessed against K. pneumoniae. Among the 13 strains whose supernatant significantly impaired biofilm formation, Lactobacillus plantarum CIRM653 was selected because it was also able to impair K. pneumoniae preformed biofilm, independently of a bactericidal effect. Mixed K. pneumoniae/L. plantarum CIRM653 biofilms had reduced tridimensional structures associated with a significant decrease in K. pneumoniae biomass. Further investigation showed that L. plantarum CIRM653 supernatant induced transcriptional modifications of K. pneumoniae biofilm-related genes, including down-regulation of the quorum sensing-related lsr operons and over-expression of type 3 pili structure genes. Increased production of type 3 pili was validated by Western-blot, hemagglutination and adhesion assays. L. plantarum CIRM653 activity against K. pneumoniae was also assessed in a murine intestinal colonisation model: a constant faecal pathogen burden was observed, as against a gradual decrease in the control group. These results reveal that an in vitro a priori attracting anti-biofilm activity of Lactobacillus might be counterbalanced by an in vivo behaviour in a complex microbiota environment with potential deleterious dispersal of highly adherent K. pneumoniae cells, raising the question of the accuracy of in vitro assays in screening of beneficial microbes.
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Affiliation(s)
- R. Lagrafeuille
- Université Clermont Auvergne, CNRS UMR 6023 Laboratoire Microorganismes: Génome et Environnement (LMGE), 63000 Clermont-Ferrand, France
| | - S. Miquel
- Université Clermont Auvergne, CNRS UMR 6023 Laboratoire Microorganismes: Génome et Environnement (LMGE), 63000 Clermont-Ferrand, France
| | - D. Balestrino
- Université Clermont Auvergne, CNRS UMR 6023 Laboratoire Microorganismes: Génome et Environnement (LMGE), 63000 Clermont-Ferrand, France
| | | | - F. Chain
- Commensal and Probiotics-Host Interactions Laboratory/AgroParisTech, UMR 1319 Micalis, INRA, 78352 Jouy-en-Josas, France
| | - P. Langella
- Commensal and Probiotics-Host Interactions Laboratory/AgroParisTech, UMR 1319 Micalis, INRA, 78352 Jouy-en-Josas, France
| | - C. Forestier
- Université Clermont Auvergne, CNRS UMR 6023 Laboratoire Microorganismes: Génome et Environnement (LMGE), 63000 Clermont-Ferrand, France
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Forestier C, Billard E, Milon G, Gueirard P. Unveiling and Characterizing Early Bilateral Interactions between Biofilm and the Mouse Innate Immune System. Front Microbiol 2017; 8:2309. [PMID: 29209305 PMCID: PMC5702342 DOI: 10.3389/fmicb.2017.02309] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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: 08/24/2017] [Accepted: 11/08/2017] [Indexed: 12/20/2022] Open
Abstract
A very substantial progress has been made in our understanding of infectious diseases caused by invasive bacteria. Under their planktonic forms, bacteria transiently reside in the otherwise sterile mammal body tissues, as the physiological inflammation insures both their clearance and repair of any tissue damage. Yet, the bacteria prone to experience planktonic to biofilm developmental transition still need to be studied. Of note, sessile bacteria not only persist but also concur preventing the effectors and regulators of the physiological inflammation to operate. Thus, it is urgent to design biologically sound experimental approaches aimed to extract, at the earliest stage, immune signatures of mono-bacteria planktonic to biofilm developmental transition in vivo and ex vivo. Indeed, the transition is often the first event to which succeeds the “chronicization” process whereby classical bacteria-targeting therapies are no more efficacious. An in vivo model of micro-injection of Staphylococcus aureus planktonic or biofilm cells in the ear pinna dermis of laboratory transgenic mice with fluorescent immune cells is proposed. It allows visualizing, in real time, the range of the early interactions between the S. aureus and myeloid cell subsets- the resident macrophages and dendritic cells, the recruited neutrophil granulocytes/polymorphonuclear neutrophils, monocytes otherwise known to differentiate as macrophages or dendritic cells. One main objective is to extract contrasting immune signatures of the modulation of the physiological inflammation with respect to the two bacterial lifestyles.
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Affiliation(s)
- Christiane Forestier
- CNRS UMR 6023, Laboratoire Microorganismes: Génome et Environnement, Université Clermont-Auvergne, Clermont-Ferrand, France
| | - Elisabeth Billard
- INRA USC 2018, Inserm U1071, Laboratoire Microbes Intestin Inflammation et Susceptibilité de l'Hôte, Université Clermont-Auvergne, Clermont-Ferrand, France
| | | | - Pascale Gueirard
- CNRS UMR 6023, Laboratoire Microorganismes: Génome et Environnement, Université Clermont-Auvergne, Clermont-Ferrand, France
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Cucuel J, Spiga R, Mohammedi R, Chouhab Y, Parsis P, Forestier C, Redjaline A, Martinez M. Suivi des recommandations sur la prise en charge des traumatisés crâniens légers sous anticoagulants et antiagrégants plaquettaires dans un service d’urgence. Ann Fr Med Urgence 2017. [DOI: 10.1007/s13341-017-0785-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Carvalho G, Guilhen C, Balestrino D, Forestier C, Mathias JD. Relating switching rates between normal and persister cells to substrate and antibiotic concentrations: a mathematical modelling approach supported by experiments. Microb Biotechnol 2017; 10:1616-1627. [PMID: 28730700 PMCID: PMC5658594 DOI: 10.1111/1751-7915.12739] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 08/26/2016] [Revised: 05/03/2017] [Accepted: 05/04/2017] [Indexed: 11/29/2022] Open
Abstract
We developed and compared two mathematical models of variable phenotypic switching rates between normal and persister cells that depend on substrate concentration and antibiotic presence. They could be used to simulate the formation of persisters in environments with concentration gradients such as biofilms. Our models are extensions of a previous model of the dynamics of normal and persistent cell populations developed by Balaban et al. (2004, Science 305: 1622). We calibrated the models’ parameters with experimental killing curves obtained after ciprofloxacin treatment of samples regularly harvested from planktonic batch cultures of Klebsiella pneumoniae. Our switching models accurately reproduced the dynamics of normal and persistent populations in planktonic batch cultures and under antibiotic treatment. Results showed that the models are valid for a large range of substrate concentrations and for zero or high doses of antibiotics.
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Affiliation(s)
- Gabriel Carvalho
- UR LISC Laboratoire d'ingénierie pour les systèmes complexes, Irstea, Aubière, France
| | - Cyril Guilhen
- LMGE, UMR6023 CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Damien Balestrino
- LMGE, UMR6023 CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
| | | | - Jean-Denis Mathias
- UR LISC Laboratoire d'ingénierie pour les systèmes complexes, Irstea, Aubière, France
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Miladi I, Vivier M, Dauplat MM, Chatard M, Besse S, Vidal A, Chassain K, Jean B, Forestier C, Chezal JM, Rédini F, Degoul F, Miot-Noirault E. Doxycycline and its quaternary ammonium derivative for adjuvant therapies of chondrosarcoma. Cancer Chemother Pharmacol 2017; 80:517-526. [DOI: 10.1007/s00280-017-3377-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 06/27/2017] [Indexed: 12/22/2022]
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Guilhen C, Forestier C, Balestrino D. Biofilm dispersal: multiple elaborate strategies for dissemination of bacteria with unique properties. Mol Microbiol 2017; 105:188-210. [PMID: 28422332 DOI: 10.1111/mmi.13698] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2017] [Indexed: 01/22/2023]
Abstract
In most environments, microorganisms evolve in a sessile mode of growth, designated as biofilm, which is characterized by cells embedded in a self-produced extracellular matrix. Although a biofilm is commonly described as a "cozy house" where resident bacteria are protected from aggression, bacteria are able to break their biofilm bonds and escape to colonize new environments. This regulated process is observed in a wide variety of species; it is referred to as biofilm dispersal, and is triggered in response to various environmental and biological signals. The first part of this review reports the main regulatory mechanisms and effectors involved in biofilm dispersal. There is some evidence that dispersal is a necessary step between the persistence of bacteria inside biofilm and their dissemination. In the second part, an overview of the main methods used so far to study the dispersal process and to harvest dispersed bacteria was provided. Then focus was on the properties of the biofilm-dispersed bacteria and the fundamental role of the dispersal process in pathogen dissemination within a host organism. In light of the current body of knowledge, it was suggested that dispersal acts as a potent means of disseminating bacteria with enhanced colonization properties in the surrounding environment.
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Affiliation(s)
- Cyril Guilhen
- Laboratoire Microorganismes : Génome et Environnement, UMR CNRS 6023, Université Clermont Auvergne, Clermont Ferrand, F-63001, France
| | - Christiane Forestier
- Laboratoire Microorganismes : Génome et Environnement, UMR CNRS 6023, Université Clermont Auvergne, Clermont Ferrand, F-63001, France
| | - Damien Balestrino
- Laboratoire Microorganismes : Génome et Environnement, UMR CNRS 6023, Université Clermont Auvergne, Clermont Ferrand, F-63001, France
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Ory J, Bricheux G, Togola A, Bonnet JL, Donnadieu-Bernard F, Nakusi L, Forestier C, Traore O. Ciprofloxacin residue and antibiotic-resistant biofilm bacteria in hospital effluent. Environ Pollut 2016; 214:635-645. [PMID: 27131824 DOI: 10.1016/j.envpol.2016.04.033] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [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: 02/25/2016] [Revised: 04/06/2016] [Accepted: 04/09/2016] [Indexed: 06/05/2023]
Abstract
Discharge of antimicrobial residues and resistant bacteria in hospital effluents is supposed to have strong impacts on the spread of antibiotic resistant bacteria in the environment. This study aimed to characterize the effluents of the Gabriel Montpied teaching hospital, Clermont-Ferrand, France, by simultaneously measuring the concentration of ciprofloxacin and of biological indicators resistant to this molecule in biofilms formed in the hospital effluent and by comparing these data to ciprofloxacin consumption and resistant bacterial isolates of the hospital. Determination of the measured environmental concentration of ciprofloxacin by spot sampling and polar organic chemical integrative (POCIS) sampling over 2 weeks, and comparison with predicted environmental concentrations produced a hazard quotient >1, indicating a potential ecotoxicological risk. A negative impact was also observed with whole hospital effluent samples using the Tetrahymena pyriformis biological model. During the same period, biofilms were formed within the hospital effluent, and analysis of ciprofloxacin-resistant isolates indicated that Gamma-Proteobacteria were numerous, predominantly Aeromonadaceae (69.56%) and Enterobacteriaceae (22.61%). Among the 115 isolates collected, plasmid-mediated fluoroquinolone-resistant genes were detected, with mostly aac(6')-lb-cr and qnrS. In addition, 60% of the isolates were resistant to up to six antibiotics, including molecules mostly used in the hospital (aminosides and third-generation cephalosporins). In parallel, 1247 bacteria isolated from hospitalized patients and resistant to at least one of the fluoroquinolones were collected. Only 5 of the 14 species identified in the effluent biofilm were also found in the clinical isolates, but PFGE typing of the Gram-negative isolates found in both compartments showed there was no clonality among the strains. Altogether, these data confirm the role of hospital loads as sources of pollution for wastewater and question the role of environmental biofilms communities as efficient shelters for hospital-released resistance genes.
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Affiliation(s)
- Jérôme Ory
- Université Clermont Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, Université d'Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; CNRS, UMR 6023, LMGE, F-63170, Campus Universitaire des Cézeaux, France; Service d'hygiène, CHU de Clermont-Ferrand, rue Montalembert, 63003, Clermont-Ferrand, France
| | - Geneviève Bricheux
- Université Clermont Auvergne, Université Blaise Pascal, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; CNRS, UMR 6023, LMGE, F-63170, Campus Universitaire des Cézeaux, France
| | - Anne Togola
- Bureau de recherches géologiques et minières (BRGM), 3 avenue Claude Guillemin, F-45100, Orléans, France
| | - Jean Louis Bonnet
- Université Clermont Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, Université d'Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; CNRS, UMR 6023, LMGE, F-63170, Campus Universitaire des Cézeaux, France
| | - Florence Donnadieu-Bernard
- Université Clermont Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, Université Blaise Pascal, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; CNRS, UMR 6023, LMGE, F-63170, Campus Universitaire des Cézeaux, France
| | - Laurence Nakusi
- Université Clermont Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, Université d'Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; CNRS, UMR 6023, LMGE, F-63170, Campus Universitaire des Cézeaux, France
| | - Christiane Forestier
- Université Clermont Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, Université d'Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; CNRS, UMR 6023, LMGE, F-63170, Campus Universitaire des Cézeaux, France
| | - Ousmane Traore
- Université Clermont Auvergne, Université d'Auvergne, Laboratoire "Microorganismes: Génome et Environnement", BP 10448, F-63000, Clermont-Ferrand, France; CNRS, UMR 6023, LMGE, F-63170, Campus Universitaire des Cézeaux, France; Service d'hygiène, CHU de Clermont-Ferrand, rue Montalembert, 63003, Clermont-Ferrand, France.
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Abstract
The formation and persistence of surface-attached microbial communities, known as biofilms, are responsible for 75% of human microbial infections (National Institutes of Health). Biofilm lifestyle confers several advantages to the pathogens, notably during the colonization process of medical devices and/or patients’ organs. In addition, sessile bacteria have a high tolerance to exogenous stress including anti-infectious agents. Biofilms are highly competitive communities and some microorganisms exhibit anti-biofilm capacities such as bacterial growth inhibition, exclusion or competition, which enable them to acquire advantages and become dominant. The deciphering and control of anti-biofilm properties represent future challenges in human infection control. The aim of this review is to compare and discuss the mechanisms of natural bacterial anti-biofilm strategies/mechanisms recently identified in pathogenic, commensal and probiotic bacteria and the main synthetic strategies used in clinical practice, particularly for catheter-related infections.
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Affiliation(s)
- Sylvie Miquel
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont Auvergne Clermont-Ferrand, France
| | - Rosyne Lagrafeuille
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont Auvergne Clermont-Ferrand, France
| | - Bertrand Souweine
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont AuvergneClermont-Ferrand, France; Service de Réanimation Médicale Polyvalente, CHU de Clermont-Ferrand, Clermont-FerrandFrance
| | - Christiane Forestier
- Laboratoire Microorganismes : Génome et Environnement - UMR, CNRS 6023, Université Clermont Auvergne Clermont-Ferrand, France
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Guilhen C, Charbonnel N, Parisot N, Gueguen N, Iltis A, Forestier C, Balestrino D. Transcriptional profiling of Klebsiella pneumoniae defines signatures for planktonic, sessile and biofilm-dispersed cells. BMC Genomics 2016; 17:237. [PMID: 26979871 PMCID: PMC4791964 DOI: 10.1186/s12864-016-2557-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [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: 01/21/2016] [Accepted: 02/29/2016] [Indexed: 12/22/2022] Open
Abstract
Background Surface-associated communities of bacteria, known as biofilms, play a critical role in the persistence and dissemination of bacteria in various environments. Biofilm development is a sequential dynamic process from an initial bacterial adhesion to a three-dimensional structure formation, and a subsequent bacterial dispersion. Transitions between these different modes of growth are governed by complex and partially known molecular pathways. Results Using RNA-seq technology, our work provided an exhaustive overview of the transcriptomic behavior of the opportunistic pathogen Klebsiella pneumoniae derived from free-living, biofilm and biofilm-dispersed states. For each of these conditions, the combined use of Z-scores and principal component analysis provided a clear illustration of distinct expression profiles. In particular, biofilm-dispersed cells appeared as a unique stage in the bacteria lifecycle, different from both planktonic and sessile states. The K-means cluster analysis showed clusters of Coding DNA Sequences (CDS) and non-coding RNA (ncRNA) genes differentially transcribed between conditions. Most of them included dominant functional classes, emphasizing the transcriptional changes occurring in the course of K. pneumoniae lifestyle transitions. Furthermore, analysis of the whole transcriptome allowed the selection of an overall of 40 transcriptional signature genes for the five bacterial physiological states. Conclusions This transcriptional study provides additional clues to understand the key molecular mechanisms involved in the transition between biofilm and the free-living lifestyles, which represents an important challenge to control both beneficial and harmful biofilm. Moreover, this exhaustive study identified physiological state specific transcriptomic reference dataset useful for the research community. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-2557-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Cyril Guilhen
- Laboratoire Microorganismes: Génome Environnement, UMR CNRS 6023, Université d'Auvergne, Clermont Ferrand, F-63001, France
| | - Nicolas Charbonnel
- Laboratoire Microorganismes: Génome Environnement, UMR CNRS 6023, Université d'Auvergne, Clermont Ferrand, F-63001, France
| | - Nicolas Parisot
- UMR 203 BF2I, Biologie Fonctionnelle Insectes et Interactions, INRA, INSA de Lyon, Université de Lyon, F-69621, Villeurbanne, France
| | - Nathalie Gueguen
- Laboratoire Microorganismes: Génome Environnement, UMR CNRS 6023, Université d'Auvergne, Clermont Ferrand, F-63001, France
| | - Agnès Iltis
- Genostar, Montbonnot Saint Martin, F-38330, France
| | - Christiane Forestier
- Laboratoire Microorganismes: Génome Environnement, UMR CNRS 6023, Université d'Auvergne, Clermont Ferrand, F-63001, France
| | - Damien Balestrino
- Laboratoire Microorganismes: Génome Environnement, UMR CNRS 6023, Université d'Auvergne, Clermont Ferrand, F-63001, France.
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Vorilhon C, Massard C, Raspal V, Sibaud Y, Forestier C, Charbonnel N, Descamps S, Awitor KO. Feasibility of a Chronic Foreign Body Infection Model Studying the Influence of TiO<sub>2</sub> Nanotube Layers on Bacterial Contamination. ACTA ACUST UNITED AC 2016. [DOI: 10.4236/jbnb.2016.71006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Marquès C, Tasse J, Pracros A, Collin V, Franceschi C, Laurent F, Chatellier S, Forestier C. Effects of antibiotics on biofilm and unattached cells of a clinical Staphylococcus aureus isolate from bone and joint infection. J Med Microbiol 2015; 64:1021-1026. [PMID: 26297246 DOI: 10.1099/jmm.0.000125] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Treatment of orthopaedic infections remains challenging owing to the inability of antibiotics to eradicate biofilms and prevent their regrowth. The present study characterized the effects of 12 antibiotics on in vitro biofilm formed by a representative strain of meticillin-susceptible Staphylococcus aureus (MSSA) isolated from a bone infection. Determination of the minimum biofilm eradication concentrations indicated that in vitro eradication of 24 h-old biofilms required concentrations up to 51,200 times higher than MICs. The influence of the same panel of antibiotics was also investigated on biofilm formation at concentrations including the breakpoints, by numbering viable cells in the suspensions (individual cells) and the biofilm biomass. Except for fusidic acid, the presence of antibiotics during the initial steps of biofilm formation resulted in significant decreases in the number of sessile viable bacteria at the highest concentrations tested. Ceftarolin, daptomycin, fosfomycin, gentamicin, ofloxacin, rifampicin and vancomycin were the most effective drugs. Confocal microscopy analysis indicated that daptomycin was more efficient at bacteria lysis than gentamicin and vancomycin. However, viable individual cells were still detectable in the assays performed with ceftarolin, fosfomycin, ofloxacin, rifampicin and vancomycin at concentrations for which no sessile cells were detected. Although none of the molecules tested was effective at classical therapeutic concentrations against 24 h-old MSSA biofilms, all except fusidic acid were able to impair biofilm formation at concentrations near the breakpoints. However, presence of viable individual unattached cells could imply a significant risk of microbial dissemination and increased risk of infections.
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Affiliation(s)
- Claire Marquès
- bioMérieux SA, 38390 La Balme-les-Grottes, France.,Laboratoire Microorganismes: Génome et Environnement, UMR CNRS 6023, Université d'Auvergne, 63000 Clermont-Ferrand, France
| | - Jason Tasse
- Department of Clinical Microbiology, Hospices Civils de Lyon, Lyon, France.,INSERM U1111, International Center for Research in Infectiology, University of Lyon 1, UMR CNRS 5308, Lyon, France
| | - Anne Pracros
- Laboratoire Microorganismes: Génome et Environnement, UMR CNRS 6023, Université d'Auvergne, 63000 Clermont-Ferrand, France
| | | | | | - Frédéric Laurent
- Department of Clinical Microbiology, Hospices Civils de Lyon, Lyon, France.,INSERM U1111, International Center for Research in Infectiology, University of Lyon 1, UMR CNRS 5308, Lyon, France
| | | | - Christiane Forestier
- Laboratoire Microorganismes: Génome et Environnement, UMR CNRS 6023, Université d'Auvergne, 63000 Clermont-Ferrand, France
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Villatte G, Massard C, Descamps S, Sibaud Y, Forestier C, Awitor KO. Photoactive TiO₂ antibacterial coating on surgical external fixation pins for clinical application. Int J Nanomedicine 2015; 10:3367-75. [PMID: 26005347 PMCID: PMC4428362 DOI: 10.2147/ijn.s81518] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [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] [Indexed: 12/30/2022] Open
Abstract
External fixation is a method of osteosynthesis currently used in traumatology and orthopedic surgery. Pin tract infection is a common problem in clinical practice. Infection occurs after bacterial colonization of the pin due to its contact with skin and the local environment. One way to prevent such local contamination is to create a specific coating that could be applied in the medical field. In this work, we developed a surface coating for external fixator pins based on the photocatalytic properties of titanium dioxide, producing a bactericidal effect with sufficient mechanical strength to be compatible with surgical use. The morphology and structure of the sol-gel coating layers were characterized using, respectively, scanning electron microscopy and X-ray diffraction. The resistance properties of the coating were investigated by mechanical testing. Photodegradation of acid orange 7 in aqueous solution was used as a probe to assess the photocatalytic activity of the titanium dioxide layers under ultraviolet irradiation. The bactericidal effect induced by the process was evaluated against two strains, ie, Staphylococcus aureus and multiresistant Staphylococcus epidermidis. The coated pins showed good mechanical strength and an efficient antibacterial effect after 1 hour of ultraviolet irradiation.
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Affiliation(s)
- Guillaume Villatte
- Laboratory C-Biosenss EA 4676, Clermont-Ferrand University, Université d'Auvergne, Clermont-Ferrand, France ; Department of Orthopedics, Clermont-Ferrand University Hospital (CHU), Clermont-Ferrand, France
| | - Christophe Massard
- Laboratory C-Biosenss EA 4676, Clermont-Ferrand University, Université d'Auvergne, Clermont-Ferrand, France
| | - Stéphane Descamps
- Laboratory C-Biosenss EA 4676, Clermont-Ferrand University, Université d'Auvergne, Clermont-Ferrand, France ; Department of Orthopedics, Clermont-Ferrand University Hospital (CHU), Clermont-Ferrand, France
| | - Yves Sibaud
- Laboratory C-Biosenss EA 4676, Clermont-Ferrand University, Université d'Auvergne, Clermont-Ferrand, France
| | - Christiane Forestier
- Laboratory Microorganism UMR 6023, Clermont-Ferrand University, Université d'Auvergne, Clermont-Ferrand, France
| | - Komla-Oscar Awitor
- Laboratory C-Biosenss EA 4676, Clermont-Ferrand University, Université d'Auvergne, Clermont-Ferrand, France
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Khater F, Balestrino D, Charbonnel N, Dufayard JF, Brisse S, Forestier C. In silico analysis of usher encoding genes in Klebsiella pneumoniae and characterization of their role in adhesion and colonization. PLoS One 2015; 10:e0116215. [PMID: 25751658 PMCID: PMC4353729 DOI: 10.1371/journal.pone.0116215] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 12/05/2014] [Indexed: 12/21/2022] Open
Abstract
Chaperone/usher (CU) assembly pathway is used by a wide range of Enterobacteriaceae to assemble adhesive surface structures called pili or fimbriae that play a role in bacteria-host cell interactions. In silico analysis revealed that the genome of Klebsiella pneumoniae LM21 harbors eight chromosomal CU loci belonging to γκп and ϭ clusters. Of these, only two correspond to previously described operons, namely type 1 and type 3-encoding operons. Isogenic usher deletion mutants of K. pneumoniae LM21 were constructed for each locus and their role in adhesion to animal (Intestine 407) and plant (Arabidopsis thaliana) cells, biofilm formation and murine intestinal colonization was investigated. Type 3 pili usher deleted mutant was impaired in all assays, whereas type 1 pili usher deleted mutant only showed attenuation in adhesion to plant cells and in intestinal colonization. The LM21ΔkpjC mutant was impaired in its capacity to adhere to Arabidopsis cells and to colonize the murine intestine, either alone or in co-inoculation experiments. Deletion of LM21kpgC induced a significant decrease in biofilm formation, in adhesion to animal cells and in colonization of the mice intestine. The LM21∆kpaC and LM21∆kpeC mutants were only attenuated in biofilm formation and the adhesion abilities to Arabidopsis cells, respectively. No clear in vitro or in vivo effect was observed for LM21∆kpbC and LM21∆kpdC mutants. The multiplicity of CU loci in K. pneumoniae genome and their specific adhesion pattern probably reflect the ability of the bacteria to adhere to different substrates in its diverse ecological niches.
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Affiliation(s)
- Fida Khater
- LMGE—UMR CNRS 6023- Clermont Ferrand, 63000, France
| | | | | | | | - Sylvain Brisse
- Institut Pasteur, Microbial Evolutionary Genomics, 75015 Paris, France
- CNRS, UMR 3525, Paris, France
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Nivoliez A, Veisseire P, Alaterre E, Dausset C, Baptiste F, Camarès O, Paquet-Gachinat M, Bonnet M, Forestier C, Bornes S. Influence of manufacturing processes on cell surface properties of probiotic strain Lactobacillus rhamnosus Lcr35®. Appl Microbiol Biotechnol 2014; 99:399-411. [PMID: 25280746 DOI: 10.1007/s00253-014-6110-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 09/18/2014] [Accepted: 09/19/2014] [Indexed: 01/26/2023]
Abstract
The influence of the industrial process on the properties of probiotics, administered as complex manufactured products, has been poorly investigated. In the present study, we comparatively assessed the cell wall characteristics of the probiotic strain Lactobacillus rhamnosus Lcr35® together with three of its commercial formulations with intestinal applications. Putative secreted and transmembrane-protein-encoding genes were initially searched in silico in the genome of L. rhamnosus Lcr35®. A total of 369 candidate genes were identified which expressions were followed using a custom Lactobacillus DNA chip. Among them, 60 or 67 genes had their expression either upregulated or downregulated in the Lcr Restituo® packet or capsule formulations, compared to the native Lcr35® strain. Moreover, our data showed that the probiotic formulations (Lcr Lenio®, Lcr restituo® capsule and packet) showed a better capacity to adhere to intestinal epithelial Caco-2 cells than the native Lcr35® strain. Microbial (MATS) tests showed that the probiotic was an electron donor and that they were more hydrophilic than the native strain. The enhanced adhesion capacity of the active pharmaceutical ingredients (APIs) to epithelial Caco-2 cells and their antipathogen effect could be due to this greater surface hydrophilic character. These findings suggest that the manufacturing process influences the protein composition and the chemical properties of the cell wall. It is therefore likely that the antipathogen effect of the formulation is modulated by the industrial process. Screening of the manufactured products' properties would therefore represent an essential step in evaluating the effects of probiotic strains.
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Affiliation(s)
- Adrien Nivoliez
- Département Recherche et Développement-Probionov, Rue des frères Lumières, 15130, Arpajon-sur-Cère, France,
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Dos Santos Goncalves M, Delattre C, Balestrino D, Charbonnel N, Elboutachfaiti R, Wadouachi A, Badel S, Bernardi T, Michaud P, Forestier C. Anti-biofilm activity: a function of Klebsiella pneumoniae capsular polysaccharide. PLoS One 2014; 9:e99995. [PMID: 24932475 PMCID: PMC4059750 DOI: 10.1371/journal.pone.0099995] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Accepted: 05/21/2014] [Indexed: 11/19/2022] Open
Abstract
Competition and cooperation phenomena occur within highly interactive biofilm communities and several non-biocides molecules produced by microorganisms have been described as impairing biofilm formation. In this study, we investigated the anti-biofilm capacities of an ubiquitous and biofilm producing bacterium, Klebsiella pneumoniae. Cell-free supernatant from K. pneumoniae planktonic cultures showed anti-biofilm effects on most Gram positive bacteria tested but also encompassed some Gram negative bacilli. The anti-biofilm non-bactericidal activity was further investigated on Staphylococcus epidermidis, by determining the biofilm biomass, microscopic observations and agglutination measurement through a magnetic bead-mediated agglutination test. Cell-free extracts from K. pneumoniae biofilm (supernatant and acellular matrix) also showed an influence, although to a lesser extend. Chemical analyses indicated that the active molecule was a high molecular weight polysaccharide composed of five monosaccharides: galactose, glucose, rhamnose, glucuronic acid and glucosamine and the main following sugar linkage residues [→ 2)-α-L-Rhap-(1 →]; [→ 4)-α-L-Rhap-(1 →]; [α-D-Galp-(1 →]; [→ 2,3)-α-D-Galp-(1 →]; [→ 3)-β-D-Galp-(1 →] and, [→ 4)-β-D-GlcAp-(1 →]. Characterization of this molecule indicated that this component was more likely capsular polysaccharide (CPS) and precoating of abiotic surfaces with CPS extracts from different serotypes impaired the bacteria-surface interactions. Thus the CPS of Klebsiella would exhibit a pleiotropic activity during biofilm formation, both stimulating the initial adhesion and maturation steps as previously described, but also repelling potential competitors.
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Affiliation(s)
- Marina Dos Santos Goncalves
- Clermont Université, UMR CNRS 6023, Laboratoire Microorganismes: Genome Environnement (LMGE), Université d’Auvergne, Clermont-Ferrand, France
| | - Cédric Delattre
- Clermont Université, Université Blaise Pascal, Institut Pascal UMR CNRS 6602, Polytech Clermont-Ferrand, Aubière, France
| | - Damien Balestrino
- Clermont Université, UMR CNRS 6023, Laboratoire Microorganismes: Genome Environnement (LMGE), Université d’Auvergne, Clermont-Ferrand, France
| | - Nicolas Charbonnel
- Clermont Université, UMR CNRS 6023, Laboratoire Microorganismes: Genome Environnement (LMGE), Université d’Auvergne, Clermont-Ferrand, France
| | - Redouan Elboutachfaiti
- Université de Picardie Jules Verne, EA 3900-BioPI Biologie des Plantes et de l’Innovation, IUT d’Amiens (GB), Amiens cedex, France
| | - Anne Wadouachi
- Laboratoire des Glucides FRE CNRS 3517 - Institut de Chimie de Picardie FR 3085, Université de Picardie Jules Verne, Amiens, France
| | - Stéphanie Badel
- BioFilm Control, Biopôle Clermont-Limagne, Saint-Beauzire, France
| | - Thierry Bernardi
- BioFilm Control, Biopôle Clermont-Limagne, Saint-Beauzire, France
| | - Philippe Michaud
- Clermont Université, Université Blaise Pascal, Institut Pascal UMR CNRS 6602, Polytech Clermont-Ferrand, Aubière, France
| | - Christiane Forestier
- Clermont Université, UMR CNRS 6023, Laboratoire Microorganismes: Genome Environnement (LMGE), Université d’Auvergne, Clermont-Ferrand, France
- * E-mail:
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Muller C, Busignies V, Mazel V, Forestier C, Nivoliez A, Tchoreloff P. Mechanistic approach to stability studies as a tool for the optimization and development of new products based on L. rhamnosus Lcr35® in compliance with current regulations. PLoS One 2013; 8:e79041. [PMID: 24244412 PMCID: PMC3823984 DOI: 10.1371/journal.pone.0079041] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 09/14/2013] [Indexed: 11/29/2022] Open
Abstract
Probiotics are of great current interest in the pharmaceutical industry because of their multiple effects on human health. To beneficially affect the host, an adequate dosage of the probiotic bacteria in the product must be guaranteed from the time of manufacturing to expiration date. Stability test guidelines as laid down by the ICH-Q1A stipulate a minimum testing period of 12 months. The challenge for producers is to reduce this time. In this paper, a mechanistic approach using the Arrhenius model is proposed to predict stability. Applied for the first time to laboratory and industrial probiotic powders, the model was able to provide a reliable mathematical representation of the effects of temperature on bacterial death (R2>0.9). The destruction rate (k) was determined according to the manufacturing process, strain and storage conditions. The marketed product demonstrated a better stability (k = 0.08 months−1) than the laboratory sample (k = 0.80 months−1). With industrial batches, k obtained at 6 months of studies was comparable to that obtained at 12 months, evidence of the model’s robustness. In addition, predicted values at 12 months were greatly similar (±30%) to those obtained by real-time assessing the model’s reliability. This method could be an interesting approach to predict the probiotic stability and could reduce to 6 months the length of stability studies as against 12 (ICH guideline) or 24 months (expiration date).
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Affiliation(s)
- Claudia Muller
- Département Recherche et Développement, Probionov, Aurillac, France
- Laboratoire Matériaux et Santé EA401, Univ. Paris Sud, Châtenay-Malabry, France
- * E-mail:
| | - Virginie Busignies
- Laboratoire Matériaux et Santé EA401, Univ. Paris Sud, Châtenay-Malabry, France
| | - Vincent Mazel
- Laboratoire Matériaux et Santé EA401, Univ. Paris Sud, Châtenay-Malabry, France
| | - Christiane Forestier
- Laboratoire Microorganismes : Genome Environnement (LMGE) UMR CNRS 6023 Univ. d’Auvergne-Clermont 1, Clermont-Ferrand, France
| | - Adrien Nivoliez
- Département Recherche et Développement, Probionov, Aurillac, France
| | - Pierre Tchoreloff
- Laboratoire Matériaux et Santé EA401, Univ. Paris Sud, Châtenay-Malabry, France
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Lima WC, Balestrino D, Forestier C, Cosson P. Two distinct sensing pathways allow recognition of Klebsiella pneumoniae by Dictyostelium amoebae. Cell Microbiol 2013; 16:311-23. [PMID: 24128258 PMCID: PMC4303882 DOI: 10.1111/cmi.12226] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [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: 07/31/2013] [Revised: 09/24/2013] [Accepted: 10/07/2013] [Indexed: 12/24/2022]
Abstract
Recognition of bacteria by metazoans is mediated by receptors that recognize different types of microorganisms and elicit specific cellular responses. The soil amoebae Dictyostelium discoideum feeds upon a variable mixture of environmental bacteria, and it is expected to recognize and adapt to various food sources. To date, however, no bacteria-sensing mechanisms have been described. In this study, we isolated a Dictyostelium mutant (fspA KO) unable to grow in the presence of non-capsulated Klebsiella pneumoniae bacteria, but growing as efficiently as wild-type cells in the presence of other bacteria, such as Bacillus subtilis. fspA KO cells were also unable to respond to K. pneumoniae and more specifically to bacterially secreted folate in a chemokinetic assay, while they responded readily to B. subtilis. Remarkably, both WT and fspA KO cells were able to grow in the presence of capsulated LM21 K. pneumoniae, and responded to purified capsule, indicating that capsule recognition may represent an alternative, FspA-independent mechanism for K. pneumoniae sensing. When LM21 capsule synthesis genes were deleted, growth and chemokinetic response were lost for fspA KO cells, but not for WT cells. Altogether, these results indicate that Dictyostelium amoebae use specific recognition mechanisms to respond to different K. pneumoniae elements.
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Affiliation(s)
- Wanessa C Lima
- Department for Cell Physiology and Metabolism, Centre Medical Universitaire, University of Geneva, 1 rue Michel Servet, 1211, Geneva 4, Switzerland
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Da Re S, Valle J, Charbonnel N, Beloin C, Latour-Lambert P, Faure P, Turlin E, Le Bouguénec C, Renauld-Mongénie G, Forestier C, Ghigo JM. Identification of commensal Escherichia coli genes involved in biofilm resistance to pathogen colonization. PLoS One 2013; 8:e61628. [PMID: 23667443 PMCID: PMC3646849 DOI: 10.1371/journal.pone.0061628] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2012] [Accepted: 03/12/2013] [Indexed: 12/24/2022] Open
Abstract
Protection provided by host bacterial microbiota against microbial pathogens is a well known but ill-understood property referred to as the barrier effect, or colonization resistance. Despite recent genome-wide analyses of host microbiota and increasing therapeutic interest, molecular analysis of colonization resistance is hampered by the complexity of direct in vivo experiments. Here we developed an in vitro-to-in vivo approach to identification of genes involved in resistance of commensal bacteria to exogenous pathogens. We analyzed genetic responses induced in commensal Escherichia coli upon entry of a diarrheagenic enteroaggregative E. coli or an unrelated Klebsiella pneumoniae pathogen into a biofilm community. We showed that pathogens trigger specific responses in commensal bacteria and we identified genes involved in limiting colonization of incoming pathogens within commensal biofilm. We tested the in vivo relevance of our findings by comparing the extent of intestinal colonization by enteroaggregative E. coli and K. pneumoniae pathogens in mice pre-colonized with E. coli wild type commensal strain, or mutants corresponding to identified colonization resistance genes. We demonstrated that the absence of yiaF and bssS (yceP) differentially alters pathogen colonization in the mouse gut. This study therefore identifies previously uncharacterized colonization resistance genes and provides new approaches to unravelling molecular aspects of commensal/pathogen competitive interactions.
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Affiliation(s)
- Sandra Da Re
- Institut Pasteur, Unité de Génétique des Biofilms, Département de Microbiologie, Paris, France
| | - Jaione Valle
- Institut Pasteur, Unité de Génétique des Biofilms, Département de Microbiologie, Paris, France
| | - Nicolas Charbonnel
- Université d'Auvergne-Clermont 1, Laboratoire de Bactériologie, Clermont-Ferrand, France
| | - Christophe Beloin
- Institut Pasteur, Unité de Génétique des Biofilms, Département de Microbiologie, Paris, France
| | - Patricia Latour-Lambert
- Institut Pasteur, Unité de Génétique des Biofilms, Département de Microbiologie, Paris, France
| | - Philippe Faure
- Université Pierre et Marie Curie, Equipe Neurophysiologie et Comportement (NPC) - UMR 7102, Paris, France
| | - Evelyne Turlin
- Institut Pasteur, Unité des Membranes Bactériennes, Département de Microbiologie, Paris, France
| | - Chantal Le Bouguénec
- Institut Pasteur, Unité de Biologie des Bactéries Pathogènes à Gram Positif, Département de Microbiologie, Paris, France
| | | | - Christiane Forestier
- Université d'Auvergne-Clermont 1, Laboratoire de Bactériologie, Clermont-Ferrand, France
| | - Jean-Marc Ghigo
- Institut Pasteur, Unité de Génétique des Biofilms, Département de Microbiologie, Paris, France
- * E-mail:
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Bricheux G, Morin L, Le Moal G, Coffe G, Balestrino D, Charbonnel N, Bohatier J, Forestier C. Pyrosequencing assessment of prokaryotic and eukaryotic diversity in biofilm communities from a French river. Microbiologyopen 2013; 2:402-14. [PMID: 23520129 PMCID: PMC3684755 DOI: 10.1002/mbo3.80] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [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: 11/12/2012] [Revised: 02/01/2013] [Accepted: 02/13/2013] [Indexed: 01/28/2023] Open
Abstract
Despite the recent and significant increase in the study of aquatic microbial communities, little is known about the microbial diversity of complex ecosystems such as running waters. This study investigated the biodiversity of biofilm communities formed in a river with 454 Sequencing™. This river has the particularity of integrating both organic and microbiological pollution, as receiver of agricultural pollution in its upstream catchment area and urban pollution through discharges of the wastewater treatment plant of the town of Billom. Different regions of the small subunit (SSU) ribosomal RNA gene were targeted using nine pairs of primers, either universal or specific for bacteria, eukarya, or archaea. Our aim was to characterize the widest range of rDNA sequences using different sets of polymerase chain reaction (PCR) primers. A first look at reads abundance revealed that a large majority (47–48%) were rare sequences (<5 copies). Prokaryotic phyla represented the species richness, and eukaryotic phyla accounted for a small part. Among the prokaryotic phyla, Proteobacteria (beta and alpha) predominated, followed by Bacteroidetes together with a large number of nonaffiliated bacterial sequences. Bacillariophyta plastids were abundant. The remaining bacterial phyla, Verrucomicrobia and Cyanobacteria, made up the rest of the bulk biodiversity. The most abundant eukaryotic phyla were annelid worms, followed by Diatoms, and Chlorophytes. These latter phyla attest to the abundance of plastids and the importance of photosynthetic activity for the biofilm. These findings highlight the existence and plasticity of multiple trophic levels within these complex biological systems.
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Affiliation(s)
- Geneviève Bricheux
- Laboratoire Microorganismes: Génome et Environnement, Clermont Université, Université Blaise Pascal, BP 10448, F-63000, Clermont-Ferrand, France
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Bothon FTD, Debiton E, Avlessi F, Forestier C, Teulade JC, Sohounhloue DKC. In vitro biological effects of two anti-diabetic medicinal plants used in Benin as folk medicine. BMC Complement Altern Med 2013; 13:51. [PMID: 23452899 PMCID: PMC3599091 DOI: 10.1186/1472-6882-13-51] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Accepted: 02/25/2013] [Indexed: 12/03/2022]
Abstract
BACKGROUND Extracts from Polygonum senegalensis (Polygonaceae) and Pseudocedrela kotschyi (Meliaceae) are two important traditionally used medicinal plants in rural Benin to treat many diseases and notably type 2 diabetes. The aim of the study was to investigate the α-glucosidase inhibition, antioxidant and antibacterial activities of those plants extract: Polygonum senegalensis leaves, and Pseudocedrela kotschyi root. METHODS Hydro-alcoholic (50%) extracts were analyzed for their phytochemical content and tested for their inhibition potency on α-glucosidase from Saccharomyces cerevisiae. Antioxidant activities were assessed using the DPPH, ORAC, FRAP and DCFH-DA (cell based) assay. Finally, the antibacterial activity was evaluated using MIC determination on four Gram-positive cocci (Bacillus subtilis, Clostridium difficile, Enterococcus faecalis, Staphylococcus aureus), three Gram-negative bacilli (Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae), and the yeast Candida albicans. RESULTS Each extract presented significant α-glucosidase inhibition and antioxidant activities. Polygonum senegalensis leaf extracts were the most active in each in vitro assay with an IC50 = 1.5 μg/ml for α-glucosidase inhibition and an IC50 = 6.8 μg/ml for DPPH scavenging, - 4.5 μmol Fe II/g of dry matter - 9366 μmol Trolox / g DW - for FRAP and ORAC values, respectively. IC50 = 2.3 μg GA / ml for DCFH-DA assay. Concerning its antibacterial activity, a growth inhibitory effect was observed only against three Gram negative bacilli: B. subtilis, E. faecalis, S. aureus and the yeast C. albicans at high concentration. CONCLUSION The results showed that the semi alcoholic extract of the two studied plants possess α-glucosidase inhibitory activity, antioxidant potency, and low antibacterial effect.
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Affiliation(s)
- Fifa TD Bothon
- Clermont University, Université d’Auvergne, IMTV, F-63000, Clermont-Ferrand, France
- INSERM, UMR 990, IMTV, F-63005, Clermont-Ferrand, France
- University of Abomey Calavi, Laboratoire d’étude et de Recherche en chimie Appliquée, Ecole Polytechnique d’Abomey Calavi, Cotonou, Benin
| | - Eric Debiton
- Clermont University, Université d’Auvergne, IMTV, F-63000, Clermont-Ferrand, France
- INSERM, UMR 990, IMTV, F-63005, Clermont-Ferrand, France
| | - Felicien Avlessi
- University of Abomey Calavi, Laboratoire d’étude et de Recherche en chimie Appliquée, Ecole Polytechnique d’Abomey Calavi, Cotonou, Benin
| | - Christiane Forestier
- Clermont University, Université d’Auvergne, Laboratoire Microorganismes: Génome et Environnement (LMGE), BP 10448, F-63000, Clermont-Ferrand, France
- CNRS, UMR 6023, LMGE, F-63177, Aubiere, France
| | - Jean-Claude Teulade
- Clermont University, Université d’Auvergne, IMTV, F-63000, Clermont-Ferrand, France
- INSERM, UMR 990, IMTV, F-63005, Clermont-Ferrand, France
| | - Dominique KC Sohounhloue
- University of Abomey Calavi, Laboratoire d’étude et de Recherche en chimie Appliquée, Ecole Polytechnique d’Abomey Calavi, Cotonou, Benin
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Bricheux G, Le Moal G, Hennequin C, Coffe G, Donnadieu F, Portelli C, Bohatier J, Forestier C. Characterization and evolution of natural aquatic biofilm communities exposed in vitro to herbicides. Ecotoxicol Environ Saf 2013; 88:126-34. [PMID: 23200532 DOI: 10.1016/j.ecoenv.2012.11.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 10/23/2012] [Accepted: 11/02/2012] [Indexed: 12/16/2023]
Abstract
River biofilms are assemblies of autotrophic and heterotrophic microorganisms that can be affected by pollutants such as those found in watersheds and wastewater treatment plants. In the laboratory, experimental biofilms were formed from river water, and their overall composition was investigated. Denaturing gradient gel electrophoresis (DGGE) and cytometry were used to assess the richness and diversity of these communities. The software Cytostack (available on request) was developed to treat and analyze the cytometric data. Measurements of chlorophyll-a and carotenoids were used to assess the global composition of the photoautotrophic community, whereas proteins, polysaccharides (PS) content, and esterase activities were used to assess overall changes in the mixed communities. We evaluated the effects that 3 weeks of treatment with the herbicides diuron and glyphosate (10 μg L(-1)) had on these biofilms. Exposed to diuron, bacterial communities adapted, changing their composition. Glyphosate inhibited growth of one autotrophic community but caused no chlorophyll deficit. As a whole, the biofilm acted as a micro-ecosystem, able to regulate and maintain a constant level of photosynthetic pigment through the structural adaptation of the autotrophic community. These results are one more proof that microbial diversity of aquatic biofilms is influenced by chemical stresses, potentially leading to disturbances within the ecosystems.
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Affiliation(s)
- Geneviève Bricheux
- Clermont Université, Université Blaise Pascal, Laboratoire Microorganismes: Génome et Environnement, BP 10448, Clermont-Ferrand, France.
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Aumeran C, Guyot P, Boisnoir M, Robin-Hennequin C, Vidal M, Forestier C, Traore O, Lesens O. Activity of ethanol and daptomycin lock on biofilm generated by an in vitro dynamic model using real subcutaneous injection ports. Eur J Clin Microbiol Infect Dis 2012; 32:199-206. [DOI: 10.1007/s10096-012-1732-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Accepted: 08/13/2012] [Indexed: 10/27/2022]
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Nivoliez A, Camares O, Paquet-Gachinat M, Bornes S, Forestier C, Veisseire P. Influence of manufacturing processes on in vitro properties of the probiotic strain Lactobacillus rhamnosus Lcr35®. J Biotechnol 2012; 160:236-41. [DOI: 10.1016/j.jbiotec.2012.04.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Revised: 04/04/2012] [Accepted: 04/10/2012] [Indexed: 11/15/2022]
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Hennequin C, Aumeran C, Robin F, Traore O, Forestier C. Antibiotic resistance and plasmid transfer capacity in biofilm formed with a CTX-M-15-producing Klebsiella pneumoniae isolate. J Antimicrob Chemother 2012; 67:2123-30. [PMID: 22577106 DOI: 10.1093/jac/dks169] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES To characterize a CTX-M-15-producing Klebsiella pneumoniae isolate that was identified during an outbreak involving 16 patients who had undergone endoscopic retrograde cholangiopancreatography between December 2008 and August 2009. The strain was also detected in one endoscope used for these examinations. METHODS Disc diffusion assays, MICs and isoelectric focusing were used to characterize the plasmidic CTX-M-15 β-lactamase. PCRs were used to check for the presence of genes associated with virulence or antibiotic resistance. Antibiotic tolerance tests and plasmid transfer were carried out in both planktonic and biofilm conditions. RESULTS The strain belonged to sequence type 14 and to the virulent capsular serotype K2, but produced little glucuronic acid. It contained a 62.5 kb conjugative plasmid carrying the bla(CTX-M-15), bla(OXA-1) and aac(6')-Ib-cr genes and harboured few virulence genes (uge, wabG, kfu and mrkD). The strain was highly resistant to cefotaxime (MIC 516 mg/L) and the presence of this antibiotic at sub-MIC concentrations enhanced biofilm formation. The isolate was susceptible to ofloxacin (MIC 2 mg/L), but the bactericidal effect of this antibiotic was greater in planktonic cultures and 6 h old biofilm than in 24 or 48 h old biofilms. The K. pneumoniae strain was notable for its ability to transfer its plasmid, especially in biofilm conditions, in which the rate of plasmid transfer was about 0.5/donor. CONCLUSIONS These findings demonstrate the ability of this strain to survive in a hospital environment and to transfer its extended-spectrum β-lactamase-encoding plasmid.
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Affiliation(s)
- Claire Hennequin
- Clermont Université, UMR CNRS 6023 'Laboratoire Microorganismes: Génome Environnement (LMGE)', Université d'Auvergne, F-63000 Clermont-Ferrand, France
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Abstract
All accessible mucous membranes of the human body are colonized by an abundant and diversified microbial flora called microbiota. Recent studies have shown that these microorganisms, long regarded as purely commensal, have essential beneficial effects on human health. Thus, numerous human ailments are linked to dysbiosis; that is, imbalances in the microflora composition. The administration of probiotic microorganisms could, in some situations, provide substantial relief from such disorders. These live microorganisms, which, according to the definition, confer a health benefit to the host when administered in adequate amounts, are often derived from human flora and belong mostly to lactic acid bacteria, in particular to the genus Lactobacillus . The constant improvement of knowledge of the role of human microbiota and the growing popularity of probiotics are now opening the door to new prophylactic and therapeutic strategies in human health.
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Affiliation(s)
- Sophie Coudeyras
- Université Clermont 1, UFR Pharmacie, Laboratoire de Bactériologie, Clermont Ferrand, France
| | - Christiane Forestier
- Université Clermont 1, UFR Pharmacie, Laboratoire de Bactériologie, Clermont Ferrand, France
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Ong CLY, Beatson SA, Totsika M, Forestier C, McEwan AG, Schembri MA. Molecular analysis of type 3 fimbrial genes from Escherichia coli, Klebsiella and Citrobacter species. BMC Microbiol 2010; 10:183. [PMID: 20576143 PMCID: PMC2900259 DOI: 10.1186/1471-2180-10-183] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [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: 02/05/2010] [Accepted: 06/24/2010] [Indexed: 12/04/2022] Open
Abstract
Background Catheter-associated urinary tract infection (CAUTI) is the most common nosocomial infection in the United States and is caused by a range of uropathogens. Biofilm formation by uropathogens that cause CAUTI is often mediated by cell surface structures such as fimbriae. In this study, we characterised the genes encoding type 3 fimbriae from CAUTI strains of Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca, Citrobacter koseri and Citrobacter freundii. Results Phylogenetic analysis of the type 3 fimbrial genes (mrkABCD) from 39 strains revealed they clustered into five distinct clades (A-E) ranging from one to twenty-three members. The majority of sequences grouped in clade A, which was represented by the mrk gene cluster from the genome sequenced K. pneumoniae MGH78578. The E. coli and K. pneumoniae mrkABCD gene sequences clustered together in two distinct clades, supporting previous evidence for the occurrence of inter-genera lateral gene transfer. All of the strains examined caused type 3 fimbriae mediated agglutination of tannic acid treated human erythrocytes despite sequence variation in the mrkD-encoding adhesin gene. Type 3 fimbriae deletion mutants were constructed in 13 representative strains and were used to demonstrate a direct role for type 3 fimbriae in biofilm formation. Conclusions The expression of functional type 3 fimbriae is common to many Gram-negative pathogens that cause CAUTI and is strongly associated with biofilm growth. Our data provides additional evidence for the spread of type 3 fimbrial genes by lateral gene transfer. Further work is now required to substantiate the clade structure reported here by examining more strains as well as other bacterial genera that make type 3 fimbriae and cause CAUTI.
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Affiliation(s)
- Cheryl-lynn Y Ong
- Centre for Infectious Disease Research, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia
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De Araujo C, Balestrino D, Roth L, Charbonnel N, Forestier C. Quorum sensing affects biofilm formation through lipopolysaccharide synthesis in Klebsiella pneumoniae. Res Microbiol 2010; 161:595-603. [PMID: 20600864 DOI: 10.1016/j.resmic.2010.05.014] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Revised: 05/18/2010] [Accepted: 05/20/2010] [Indexed: 11/27/2022]
Abstract
Biofilm formation by Klebsiella pneumoniae is modulated by quorum sensing through the synthesis of interspecies AI-2 autoinducers. We characterized in K. pneumoniae the genes homologous to those described in Escherichia coli involved in AI-2 transport, and created two isogenic mutants deleted of lsrCD and tqsA. The levels of extracellular AI-2 with lsrCD and tqsA knockout mutants showed increased and lowered concentrations of AI-2, respectively. The level of transcripts of luxS, the gene responsible for AI-2 synthesis, was increased in sessile cells of the tqsA mutant. In contrast, the expression of the AI-2 import regulator genes lsrR and lsrK was decreased. In addition, the two mutants lsrCD and tqsA formed biofilms with greater biomass but impaired architecture. Since exopolysaccharides play a main role in K. pneumoniae biofilm formation, we investigated their relationship with AI-2 synthesis. None of the mutations in luxS and the AI-2 transport systems affected the expression of three capsule polysaccharide-related genes (wzi, wza and wzx), but all induced an increase in the expression of two lipopolysaccharide (LPS)-synthesis-related genes, wbbM and wzm. AI-2 therefore seems to act as a regulator of biofilm formation and LPS synthesis in sessile K. pneumoniae cells.
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Affiliation(s)
- Cécilia De Araujo
- Laboratoire de Bactériologie, UFR Pharmacie, Université d'Auvergne Clermont1, UFR Pharmacie Bactériologie, 28 place Henri Dunant 63000 Clermont-Ferrand, France
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Vidal M, Illes HG, Forestier C, Lesens O. E-09 Impact des probiotiques sur la colonisation intestinale par l’entérocoque résistant à la vancomycine (ERV). Med Mal Infect 2009. [DOI: 10.1016/s0399-077x(09)74360-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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