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Fernandes-Pires G, Azevedo MD, Lanzillo M, Roux-Petronelli C, Binz PA, Cudalbu C, Sandi C, Tenenbaum L, Braissant O. Rescue of myocytes and locomotion through AAV2/9-2YF intracisternal gene therapy in a rat model of creatine transporter deficiency. Mol Ther Methods Clin Dev 2024; 32:101251. [PMID: 38745894 PMCID: PMC11091509 DOI: 10.1016/j.omtm.2024.101251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 04/18/2024] [Indexed: 05/16/2024]
Abstract
Creatine deficiency syndromes (CDS), caused by mutations in GATM (AGAT), GAMT, and SLC6A8, mainly affect the central nervous system (CNS). CDS show brain creatine (Cr) deficiency, intellectual disability with severe speech delay, behavioral troubles, epilepsy, and motor dysfunction. AGAT/GAMT-deficient patients lack brain Cr synthesis but express the Cr transporter SLC6A8 at the blood-brain barrier and are thus treatable by oral supplementation of Cr. In contrast, no satisfactory treatment has been identified for Cr transporter deficiency (CTD), the most frequent of CDS. We used our Slc6a8Y389C CTD rat model to develop a new AAV2/9-2YF-driven gene therapy re-establishing the functional Slc6a8 transporter in rat CNS. We show, after intra-cisterna magna AAV2/9-2YF-Slc6a8-FLAG vector injection of postnatal day 11 pups, the transduction of Slc6a8-FLAG in cerebellum, medulla oblongata, and spinal cord as well as a partial recovery of Cr in these brain regions, together with full prevention of locomotion defaults and impairment of myocyte development observed in Slc6a8Y389 C/y male rats. While more work is needed to correct those CTD phenotypes more associated with forebrain structures, this study is the first demonstrating positive effects of an AAV-driven gene therapy on CTD and thus represents a very encouraging approach to treat the so-far untreatable CTD.
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Affiliation(s)
- Gabriella Fernandes-Pires
- Service of Clinical Chemistry, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
| | - Marcelo Duarte Azevedo
- Laboratory of Cellular and Molecular Neurotherapies, Clinical Neurosciences Department, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
| | - Marc Lanzillo
- Service of Clinical Chemistry, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
| | - Clothilde Roux-Petronelli
- Service of Clinical Chemistry, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
| | - Pierre-Alain Binz
- Service of Clinical Chemistry, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
| | - Cristina Cudalbu
- Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Carmen Sandi
- Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Liliane Tenenbaum
- Laboratory of Cellular and Molecular Neurotherapies, Clinical Neurosciences Department, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
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Ruchti N, Braissant O, Overesch G. Real time detection of pathogenic bacteria in veterinary microbiology using isothermal microcalorimetry - A different approach. Vet Microbiol 2024; 288:109929. [PMID: 38048670 DOI: 10.1016/j.vetmic.2023.109929] [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: 05/17/2023] [Revised: 09/14/2023] [Accepted: 11/20/2023] [Indexed: 12/06/2023]
Abstract
With today's challenges regarding antibiotic resistance and the importance of the implementation of prudent use of antibiotics, fast and reliable diagnostic tools for bacterial infections and subsequent antimicrobial susceptibility testing are of utmost relevance. Isothermal microcalorimetry (IMC) is a broadly applicable method, with which metabolic heat flow in reproducing bacteria can be measured in real time. To the best of the authors' knowledge, this is the first report on examination of 124 urine samples from feline and canine urinary tract infection with an IMC-based prototype instrument. A concentration-dependent time of peak heat flow by dilution series with Escherichia coli and Enterococcus faecalis reference strains demonstrated the general good performance of the prototype for detection of these bacteria. With diagnostic culture being set as a gold standard, the diagnostic sensitivity of IMC compared to bacteriological culture was 80 %, the diagnostic specificity was 97 %. With a Cohens' kappa value (κ) of 0.80, the two methods show good concordance. The results from our study demonstrate that the IMC technology is suitable to allow reliable, but much faster detection of bacteria than conventional culture, especially for Escherichia coli. Thus, implementing IMC technology could markedly speed up the bacteriological diagnostic process in veterinary medicine.
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Affiliation(s)
- Nadine Ruchti
- Institute of Veterinary Bacteriology, University of Bern, Länggasstrasse 122, CH-3012 Bern, Switzerland
| | - Olivier Braissant
- Department of Biomedical Engineering, University of Basel, Gewerbestrasse 14, CH-4123 Allschwil, Switzerland
| | - Gudrun Overesch
- Institute of Veterinary Bacteriology, University of Bern, Länggasstrasse 122, CH-3012 Bern, Switzerland.
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Tobler D, Braissant O, Waltimo T, Bornstein MM, Astasov-Frauenhoffer M. Stannous Source in Toothpastes Leads to Differences in Their Antimicrobial Efficacy. Oral Health Prev Dent 2023; 21:319-324. [PMID: 37737308 DOI: 10.3290/j.ohpd.b4424911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
PURPOSE The aim of this in-vitro study was to investigate the antimicrobial efficacy of identical experimental toothpastes with different stannous sources. MATERIALS AND METHODS Streptococcus mutans biofilms were grown on protein-coated glass disks in static conditions for 24 h and thereafter exposed to toothpaste slurries or physiological saline (negative control; n = 15) for 30 s. Four experimental toothpastes were applied in this study, containing either stannous chloride (SnCl2; B: 3500 ppm Sn2+, and D: 3600 ppm Sn2+) or stannous fluoride (SnF2; C: 3500 ppm Sn2+, and E: 3600 ppm Sn2+). Marketed toothpaste meridol® (A: 3300 ppm SnF2) served as control. All five toothpastes contained amine fluoride (AmF). The biofilms were placed on agar surface and their metabolic activity was assessed by isothermal microcalorimetry over 96 h. The heat flow data was analysed for growth rate and lag time using grofit package in software R. Additionally, reduction of active biofilm compared to untreated control was calculated. RESULTS All toothpastes significantly prolong the lag time of treated biofilms in comparison to negative control (p < 0.05). Toothpastes containing SnF2 (C and E) prolonged the lag time statistically significantly compared to toothpastes containing SnCl2 (B and D) (p < 0.05). The maximum growth rate was statistically significantly reduced by all tested toothpastes compared to the untreated control group (p < 0.05). Toothpastes containing SnF2 (A, C and E) reached 59.9 ± 7.8, 61.9 ± 7.7, and 55.6 ± 7.0% reduction of active biofilm, respectively. Thus, they exhibit statistically significantly better results than toothpastes B (52.9 ± 9.9%) and D (44.7 ± 7.6%). Toothpaste D, which contains a slightly higher concentration of Sn2+, was the least effective in reducing active biofilm. CONCLUSION The toothpastes containing SnF2 combined with AmF had the highest antimicrobial efficacy in this study.
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Astasov-Frauenhoffer M, Göldi L, Rohr N, Worreth S, Dard E, Hünerfauth S, Töpper T, Zurflüh J, Braissant O. Antimicrobial and mechanical assessment of cellulose-based thermoformable material for invisible dental braces with natural essential oils protecting from biofilm formation. Sci Rep 2023; 13:13428. [PMID: 37596293 PMCID: PMC10439145 DOI: 10.1038/s41598-023-39320-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 07/23/2023] [Indexed: 08/20/2023] Open
Abstract
Controlling biofilm formation in the oral cavity during orthodontic treatments is crucial. Therefore, antimicrobial surfaces for invisible dental appliances are of interest to both therapists and patients. Here we present a cellulose-based thermoformable material used for invisible braces that can be loaded with essential oils (EOs) having antibacterial and antifungal properties. We hypothesize that this material can absorb and release EOs, thus providing an antimicrobial effect without compromising the safety and mechanical properties necessary for dental invisible braces. Conventional microbiology and isothermal microcalorimetry analyses revealed that the thermoformable material loaded with essential oils significantly delayed the biofilm formation of oral streptococci (S. mutans and S. mitis) under static conditions (p < 0.05) and while simulating saliva flow (p < 0.05). In addition, cytotoxicity tests (ISO 10993-5), revealed that the loaded material is well tolerated by human gingival fibroblasts. Finally, the loading with antibacterial agents did not significantly alter the mechanical properties and stability of the material (initial force (p = 0.916); initial stress (p = 0.465)). Compared to gold-standard clear aligner materials, this material offers a reliable transmission of forces for orthodontic treatments. Moreover, this approach exhibits the potential for acting as an oral drug delivery platform for multiple compounds.
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Affiliation(s)
- Monika Astasov-Frauenhoffer
- Department Research, University Center for Dental Medicine Basel UZB, University of Basel, Mattenstrasse 40, Basel, Switzerland
| | - Livia Göldi
- Department Research, University Center for Dental Medicine Basel UZB, University of Basel, Mattenstrasse 40, Basel, Switzerland
| | - Nadja Rohr
- Department Research, University Center for Dental Medicine Basel UZB, University of Basel, Mattenstrasse 40, Basel, Switzerland
| | - Sarah Worreth
- Department of Biomedical Engineering (DBE), Center of Biomechanics and Biocalorimetry, University of Basel, Allschwil, Switzerland
| | - Elise Dard
- Bottmedical AG Technologiepark Basel, Hochbergerstrasse 60C, 4057, Basel, Switzerland
| | - Selina Hünerfauth
- Bottmedical AG Technologiepark Basel, Hochbergerstrasse 60C, 4057, Basel, Switzerland
| | - Tino Töpper
- Bottmedical AG Technologiepark Basel, Hochbergerstrasse 60C, 4057, Basel, Switzerland
| | - Jonas Zurflüh
- Department Chemie, University of Basel, Mattenstrasse 24a, Basel, Switzerland
| | - Olivier Braissant
- Department of Biomedical Engineering (DBE), Center of Biomechanics and Biocalorimetry, University of Basel, Allschwil, Switzerland.
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Simicic D, Rackayova V, Braissant O, Toso C, Oldani G, Sessa D, McLin VA, Cudalbu C. Neurometabolic changes in a rat pup model of type C hepatic encephalopathy depend on age at liver disease onset. Metab Brain Dis 2023; 38:1999-2012. [PMID: 37148431 PMCID: PMC10348928 DOI: 10.1007/s11011-023-01210-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 04/02/2023] [Indexed: 05/08/2023]
Abstract
Chronic liver disease (CLD) is a serious condition where various toxins present in the blood affect the brain leading to type C hepatic encephalopathy (HE). Both adults and children are impacted, while children may display unique vulnerabilities depending on the affected window of brain development.We aimed to use the advantages of high field proton Magnetic Resonance Spectroscopy (1H MRS) to study longitudinally the neurometabolic and behavioural effects of Bile Duct Ligation (animal model of CLD-induced type C HE) on rats at post-natal day 15 (p15) to get closer to neonatal onset liver disease. Furthermore, we compared two sets of animals (p15 and p21-previously published) to evaluate whether the brain responds differently to CLD according to age onset.We showed for the first time that when CLD was acquired at p15, the rats presented the typical signs of CLD, i.e. rise in plasma bilirubin and ammonium, and developed the characteristic brain metabolic changes associated with type C HE (e.g. glutamine increase and osmolytes decrease). When compared to rats that acquired CLD at p21, p15 rats did not show any significant difference in plasma biochemistry, but displayed a delayed increase in brain glutamine and decrease in total-choline. The changes in neurotransmitters were milder than in p21 rats. Moreover, p15 rats showed an earlier increase in brain lactate and a different antioxidant response. These findings offer tentative pointers as to which neurodevelopmental processes may be impacted and raise the question of whether similar changes might exist in humans but are missed owing to 1H MRS methodological limitations in field strength of clinical magnet.
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Affiliation(s)
- Dunja Simicic
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland.
- Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland.
| | - Veronika Rackayova
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland
- Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Christian Toso
- Division of Abdominal and Transplantation Surgery, Department of Surgery, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, Hepato-pancreato-biliary Centre, Geneva University Hospitals, Geneva, Switzerland
| | - Graziano Oldani
- Division of Abdominal and Transplantation Surgery, Department of Surgery, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland
- Faculty of Medicine, Hepato-pancreato-biliary Centre, Geneva University Hospitals, Geneva, Switzerland
| | - Dario Sessa
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University of Geneva, Geneva, Switzerland
| | - Valérie A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University of Geneva, Geneva, Switzerland
| | - Cristina Cudalbu
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland.
- Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland.
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Koegel S, Braissant O, Waltimo T, Bornstein MM, Astasov-Frauenhoffer M. Evaluation of antibacterial properties of fluoride-containing mouth rinses differing in their acidic compound using a Streptococcus mutans biofilm. Swiss Dent J 2023; 133:156-163. [PMID: 36421919] [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] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
This in vitro study assessed the antibacterial effect on Streptococcus mutans biofilms of mouth rinses with 700 ppm F- (derived from NaF) that differed only in their acid compounds (malic (A), citric (B), tartaric (C), fumaric (D), hydrochloric (E), phosphoric (F), and lactic (G) acid) used to adjust pH. S. mutans (ATCC 25175) was grown for 22 h at 37°C, harvested, resuspended in simulated body fluid and biofilm formation followed for 24 h at 37°C. Thereafter, biofilms were treated with experimental rinses for 30 s, and placed in TAM48 isothermal microcalorimeter at 37°C for 72 h. Applying Gompertz growth model parameters lag time and growth rate were determined from heatflow curves; additionally, reduction of active biofilms was calculated. Moreover, samples were live/dead stained and analyzed by confocal scanning microscopy. All mouth rinses were showing statistically significant lag time and reduction of active biofilm (p<0.05, A 19.1+/-2.3h and 58.5+/-7.7%, B 15.5+/-1.1h and 41.9+/-5.3%, C 17.6+/-1.9h and 53.1+/-7.5%, D 18.4+/-2.4h and 55.8+/-8.8%, E 20.2+/-3.3h and 61.5+/-10.0%, F 20.2+/-3.0h and 61.6+/-9.3%, and G 18.3+/-2.5h and 55.3+/-8.9%). Interestingly, there were no differences found between the treated groups (p>0.05, A 0.064+/-0.004 1/h, B 0.063+/-0.005 1/h, C 0.065+/-0.004 1/h, D 0.067+/-0.004 1/h, E 0.066+/-0.006 1/h, F 0.067+/-0.004 1/h, G 0.066+/-0.006 1/h) for the maximum growth rate. Vitality staining supported these findings.. The present investigation demonstrates that the type of acid compounds used to produce the rinses did not show any negative effect on the antimicrobial properties of the tested products as all of them exhibited a similar efficacy against S. mutans biofilms.
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Affiliation(s)
- Sally Koegel
- Department of Oral Health & Medicine, University Center for Dental Medicine Basel (UZB), University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
| | - Olivier Braissant
- Center of Biomechanics and Biocalorimetry, University of Basel, c/o Department of Biomedical Engineering (DBE), Gewerbestrasse 14, 4123 Allschwil, Switzerland
| | - Tuomas Waltimo
- Department of Oral Health & Medicine, University Center for Dental Medicine Basel (UZB), University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
| | - Michael M Bornstein
- Department of Oral Health & Medicine, University Center for Dental Medicine Basel (UZB), University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
- Department Research, University Center for Dental Medicine Basel (UZB), University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
| | - Monika Astasov-Frauenhoffer
- Department Research, University Center for Dental Medicine Basel (UZB), University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
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Volkart S, Kym U, Braissant O, Delgado-Eckert E, Al-Samir S, Angresius R, Huo Z, Holland-Cunz S, Gros SJ. AQP1 in the Gastrointestinal Tract of Mice: Expression Pattern and Impact of AQP1 Knockout on Colonic Function. Int J Mol Sci 2023; 24:ijms24043616. [PMID: 36835026 PMCID: PMC9959819 DOI: 10.3390/ijms24043616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 02/04/2023] [Accepted: 02/06/2023] [Indexed: 02/15/2023] Open
Abstract
Aquaporin 1 (AQP1) is one of thirteen known mammalian aquaporins. Its main function is the transport of water across cell membranes. Lately, a role of AQP has been attributed to other physiological and pathological functions including cell migration and peripheral pain perception. AQP1 has been found in several parts of the enteric nervous system, e.g., in the rat ileum and in the ovine duodenum. Its function in the intestine appears to be multifaceted and is still not completely understood. The aim of the study was to analyze the distribution and localization of AQP1 in the entire intestinal tract of mice. AQP1 expression was correlated with the hypoxic expression profile of the various intestinal segments, intestinal wall thickness and edema, as well as other aspects of colon function including the ability of mice to concentrate stools and their microbiome composition. AQP1 was found in a specific pattern in the serosa, the mucosa, and the enteric nervous system throughout the gastrointestinal tract. The highest amount of AQP1 in the gastrointestinal tract was found in the small intestine. AQP1 expression correlated with the expression profiles of hypoxia-dependent proteins such as HIF-1α and PGK1. Loss of AQP1 through knockout of AQP1 in these mice led to a reduced amount of bacteroidetes and firmicutes but an increased amount of the rest of the phyla, especially deferribacteres, proteobacteria, and verrucomicrobia. Although AQP-KO mice retained gastrointestinal function, distinct changes regarding the anatomy of the intestinal wall including intestinal wall thickness and edema were observed. Loss of AQP1 might interfere with the ability of the mice to concentrate their stool and it is associated with a significantly different composition of the of the bacterial stool microbiome.
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Affiliation(s)
- Stefanie Volkart
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Urs Kym
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Olivier Braissant
- Microcalorimetry Unit, Department of Biomedical Engineering, University of Basel, 4001 Basel, Switzerland
| | - Edgar Delgado-Eckert
- Computational Physiology and Biostatistics, Department of Biomedical Engineering at University of Basel and University Children’s Hospital Basel, 4056 Basel, Switzerland
| | - Samer Al-Samir
- Vegetative Physiologie 4220, Zentrum Physiologie, Medizinische Hochschule Hannover, 30625 Hannover, Germany
| | - Rebecca Angresius
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Zihe Huo
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Stefan Holland-Cunz
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Department of Clinical Research, University of Basel, 4001 Basel, Switzerland
| | - Stephanie J. Gros
- Department of Pediatric Surgery, University Children’s Hospital Basel, 4056 Basel, Switzerland
- Correspondence:
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Vehusheia SLK, Roman C, Braissant O, Arnoldini M, Hierold C. Enabling direct microcalorimetric measurement of metabolic activity and exothermic reactions onto microfluidic platforms via heat flux sensor integration. Microsyst Nanoeng 2023; 9:56. [PMID: 37180454 PMCID: PMC10169645 DOI: 10.1038/s41378-023-00525-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 02/13/2023] [Indexed: 05/16/2023]
Abstract
All biological processes use or produce heat. Traditional microcalorimeters have been utilized to study the metabolic heat output of living organisms and heat production of exothermic chemical processes. Current advances in microfabrication have made possible the miniaturization of commercial microcalorimeters, resulting in a few studies on the metabolic activity of cells at the microscale in microfluidic chips. Here we present a new, versatile, and robust microcalorimetric differential design based on the integration of heat flux sensors on top of microfluidic channels. We show the design, modeling, calibration, and experimental verification of this system by utilizing Escherichia coli growth and the exothermic base catalyzed hydrolysis of methyl paraben as use cases. The system consists of a Polydimethylsiloxane based flow-through microfluidic chip with two 46 µl chambers and two integrated heat flux sensors. The differential compensation of thermal power measurements allows for the measurement of bacterial growth with a limit of detection of 1707 W/m3, corresponding to 0.021OD (2 ∙ 107 bacteria). We also extracted the thermal power of a single Escherichia coli of between 1.3 and 4.5 pW, comparable to values measured by industrial microcalorimeters. Our system opens the possibility for expanding already existing microfluidic systems, such as drug testing lab-on-chip platforms, with measurements of metabolic changes of cell populations in form of heat output, without modifying the analyte and minimal interference with the microfluidic channel itself.
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Affiliation(s)
- Signe L. K. Vehusheia
- Micro and Nanosystems, Department of Mechanical and Process Engineering, ETH Zurich, Tannenstrasse 3, 8092 Zurich, Switzerland
| | - Cosmin Roman
- Micro and Nanosystems, Department of Mechanical and Process Engineering, ETH Zurich, Tannenstrasse 3, 8092 Zurich, Switzerland
| | - Olivier Braissant
- Center of Biomechanics and Biocalorimetry, Department of Biomedical Engineering, University of Basel, Hegenheimermattweg 167C, 4123 Allschwil, Switzerland
| | - Markus Arnoldini
- Laboratory for Food Immunology, Department of Health Sciences and Technology, ETH Zurich, Otto-Stern-Weg 3, 8093 Zurich, Switzerland
| | - Christofer Hierold
- Micro and Nanosystems, Department of Mechanical and Process Engineering, ETH Zurich, Tannenstrasse 3, 8092 Zurich, Switzerland
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Duteil T, Bourillot R, Braissant O, Grégoire B, Leloup M, Portier E, Brigaud B, Féniès H, Svahn I, Henry A, Yokoyama Y, Visscher PT. Preservation of exopolymeric substances in estuarine sediments. Front Microbiol 2022; 13:921154. [PMID: 36060749 PMCID: PMC9434125 DOI: 10.3389/fmicb.2022.921154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 07/29/2022] [Indexed: 11/23/2022] Open
Abstract
The surface of intertidal estuarine sediments is covered with diatom biofilms excreting exopolymeric substances (EPSs) through photosynthesis. These EPSs are highly reactive and increase sediment cohesiveness notably through organo-mineral interactions. In most sedimentary environments, EPSs are partly to fully degraded by heterotrophic bacteria in the uppermost millimeters of the sediment and so they are thought to be virtually absent deeper in the sedimentary column. Here, we present the first evidence of the preservation of EPSs and EPS-mineral aggregates in a 6-m-long sedimentary core obtained from an estuarine point bar in the Gironde Estuary. EPSs were extracted from 18 depth intervals along the core, and their physicochemical properties were characterized by (i) wet chemical assays to measure the concentrations of polysaccharides and proteins, and EPS deprotonation of functional groups, (ii) acid–base titrations, and (iii) Fourier transform infrared spectroscopy. EPS-sediment complexes were also imaged using cryo-scanning electron microscopy. EPS results were analyzed in the context of sediment properties including facies, grain size, and total organic carbon, and of metabolic and enzymatic activities. Our results showed a predictable decrease in EPS concentrations (proteins and polysaccharides) and reactivity from the surface biofilm to a depth of 0.5 m, possibly linked to heterotrophic degradation. Concentrations remained relatively low down to ca. 4.3 m deep. Surprisingly, at that depth EPSs abundance was comparable to the surface and showed a downward decrease to 6.08 m. cryo-scanning electron microscopy (Cryo-SEM) showed that the EPS complexes with sediment were abundant at all studied depth and potentially protected EPSs from degradation. EPS composition did not change substantially from the surface to the bottom of the core. EPS concentrations and acidity were anti-correlated with metabolic activity, but showed no statistical correlation with grain size, TOC, depth or enzymatic activity. Maximum EPS concentrations were found at the top of tide-dominated sedimentary sequences, and very low concentrations were found in river flood-dominated sedimentary sequences. Based on this observation, we propose a scenario where biofilm development and EPS production are maximal when (i) the point bar and the intertidal areas were the most extensive, i.e., tide-dominated sequences and (ii) the tide-dominated deposit were succeeded by rapid burial beneath sediments, potentially decreasing the probability of encounter between bacterial cells and EPSs.
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Affiliation(s)
- Thibault Duteil
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Pessac, France
- *Correspondence: Thibault Duteil,
| | | | - Olivier Braissant
- Department Biomedical Engineering (DBE), Center for Biomechanics and Biocalorimetry, University of Basel, Allschwil, Switzerland
| | - Brian Grégoire
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Centre National de la Recherche Scientifique (CNRS), Université de Poitiers, Poitiers, France
| | - Maud Leloup
- Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Centre National de la Recherche Scientifique (CNRS), Université de Poitiers, Poitiers, France
| | | | | | - Hugues Féniès
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Pessac, France
| | - Isabelle Svahn
- Bordeaux Imaging Center (BIC), CNRS, Université de Bordeaux, Bordeaux, France
| | - Adrien Henry
- Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Pessac, France
| | - Yusuke Yokoyama
- Department of Earth and Planetary Sciences, Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwanoha, Chiba, Japan
| | - Pieter T. Visscher
- Department of Marine Sciences and Geosciences, University of Connecticut, Groton, CT, United States
- CNRS, Biogéosciences, Université de Bourgogne Franche-Comté, Dijon, France
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Pultrone L, Schmid R, Waltimo T, Braissant O, Astasov-Frauenhoffer M. Saliva profiling with differential scanning calorimetry: A feasibility study with ex vivo samples. PLoS One 2022; 17:e0269600. [PMID: 35687571 PMCID: PMC9187081 DOI: 10.1371/journal.pone.0269600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 05/24/2022] [Indexed: 11/18/2022] Open
Abstract
Differential scanning calorimetry (DSC) has been used widely to study various biomarkers from blood, less is known about the protein profiles from saliva. The aim of the study was to investigate the use DSC in order to detect saliva thermal profiles and determine the most appropriate sampling procedure to collect and process saliva. Saliva was collected from 25 healthy young individuals and processed using different protocols based on centrifugation and filtering. The most effective protocol was centrifugation at 5000g for 10 min at 4°C followed by filtration through Millex 0.45 μm filter. Prepared samples were transferred to 3 mL calorimetric ampoules and then loaded into TAM48 calibrated to 30°C until analysis. DSC scans were recorded from 30°C to 90°C at a scan rate of 1°C/h with a pre-conditioning the samples to starting temperature for 1 h. The results show that the peak distribution of protein melting points was clearly bimodal, and the majority of peaks appeared between 40–50°C. Another set of peaks is visible between 65°C– 75°C. Additionally, the peak amplitude and area under the peak are less affected by the concentration of protein in the sample than by the individual differences between people. In conclusion, the study shows that with right preparation of the samples, there is a possibility to have thermograms of salivary proteins that show peaks in similar temperature regions between different healthy volunteers.
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Affiliation(s)
- Lena Pultrone
- Clinic for Oral Health & Medicine, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
| | - Raphael Schmid
- Clinic for Oral Health & Medicine, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
| | - Tuomas Waltimo
- Clinic for Oral Health & Medicine, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
| | - Olivier Braissant
- Center of Biomechanics and Biocalorimetry, c/o Department of Biomedical Engineering (DBE), University of Basel, Allschwil, Switzerland
| | - Monika Astasov-Frauenhoffer
- Department Research, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Switzerland
- * E-mail:
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11
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Pierzchala K, Simicic D, Sienkiewicz A, Sessa D, Mitrea S, Braissant O, McLin VA, Gruetter R, Cudalbu C. Corrigendum to "Central nervous system and systemic oxidative stress interplay with inflammation in a bile duct ligation rat model of type C hepatic encephalopathy" [Free Radical Biol. Med. 178 (2022) 295-307 ISSN 0891-5849]. Free Radic Biol Med 2022; 182:289. [PMID: 35078692 DOI: 10.1016/j.freeradbiomed.2022.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- K Pierzchala
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Laboratory of Functional and Metabolic Imaging, EPFL, Lausanne, Switzerland.
| | - D Simicic
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Laboratory of Functional and Metabolic Imaging, EPFL, Lausanne, Switzerland
| | - A Sienkiewicz
- Laboratory for Quantum Magnetism, Institute of Physics, EPFL, Lausanne, Switzerland; ADSresonances Sàrl, Préverenges, Switzerland
| | - D Sessa
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva and University of Geneva, Geneva, Switzerland
| | - S Mitrea
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - O Braissant
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - V A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva and University of Geneva, Geneva, Switzerland
| | - R Gruetter
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Laboratory of Functional and Metabolic Imaging, EPFL, Lausanne, Switzerland
| | - C Cudalbu
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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12
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Duran‐Trio L, Fernandes‐Pires G, Grosse J, Soro‐Arnaiz I, Roux‐Petronelli C, Binz P, De Bock K, Cudalbu C, Sandi C, Braissant O. Creatine transporter-deficient rat model shows motor dysfunction, cerebellar alterations, and muscle creatine deficiency without muscle atrophy. J Inherit Metab Dis 2022; 45:278-291. [PMID: 34936099 PMCID: PMC9302977 DOI: 10.1002/jimd.12470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/16/2021] [Accepted: 12/19/2021] [Indexed: 12/11/2022]
Abstract
Creatine (Cr) is a nitrogenous organic acid and plays roles such as fast phosphate energy buffer to replenish ATP, osmolyte, antioxidant, neuromodulator, and as a compound with anabolic and ergogenic properties in muscle. Cr is taken from the diet or endogenously synthetized by the enzymes arginine:glycine amidinotransferase and guanidinoacetate methyltransferase, and specifically taken up by the transporter SLC6A8. Loss-of-function mutations in the genes encoding for the enzymes or the transporter cause creatine deficiency syndromes (CDS). CDS are characterized by brain Cr deficiency, intellectual disability with severe speech delay, behavioral troubles, epilepsy, and motor dysfunction. Among CDS, the X-linked Cr transporter deficiency (CTD) is the most prevalent with no efficient treatment so far. Different animal models of CTD show reduced brain Cr levels, cognitive deficiencies, and together they cover other traits similar to those of patients. However, motor function was poorly explored in CTD models, and some controversies in the phenotype exist in comparison with CTD patients. Our recently described Slc6a8Y389C knock-in rat model of CTD showed mild impaired motor function, morphological alterations in cerebellum, reduced muscular mass, Cr deficiency, and increased guanidinoacetate content in muscle, although no consistent signs of muscle atrophy. Our results indicate that such motor dysfunction co-occurred with both nervous and muscle dysfunctions, suggesting that muscle strength and performance as well as neuronal connectivity might be affected by this Cr deficiency in muscle and brain.
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Affiliation(s)
- Lara Duran‐Trio
- Service of Clinical ChemistryUniversity of Lausanne and Lausanne University Hospital of LausanneLausanneSwitzerland
| | - Gabriella Fernandes‐Pires
- Service of Clinical ChemistryUniversity of Lausanne and Lausanne University Hospital of LausanneLausanneSwitzerland
| | - Jocelyn Grosse
- Brain Mind InstituteEcole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Ines Soro‐Arnaiz
- Department of Health Sciences and TechnologySwiss Federal Institute of Technology (ETH)ZurichSwitzerland
| | - Clothilde Roux‐Petronelli
- Service of Clinical ChemistryUniversity of Lausanne and Lausanne University Hospital of LausanneLausanneSwitzerland
| | - Pierre‐Alain Binz
- Service of Clinical ChemistryUniversity of Lausanne and Lausanne University Hospital of LausanneLausanneSwitzerland
| | - Katrien De Bock
- Department of Health Sciences and TechnologySwiss Federal Institute of Technology (ETH)ZurichSwitzerland
| | - Cristina Cudalbu
- Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Carmen Sandi
- Brain Mind InstituteEcole Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
| | - Olivier Braissant
- Service of Clinical ChemistryUniversity of Lausanne and Lausanne University Hospital of LausanneLausanneSwitzerland
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13
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Mosso J, Yin T, Poitry-Yamate C, Simicic D, Lepore M, McLin VA, Braissant O, Cudalbu C, Lanz B. PET CMR glc mapping and 1H-MRS show altered glucose uptake and neurometabolic profiles in BDL rats. Anal Biochem 2022; 647:114606. [PMID: 35240109 DOI: 10.1016/j.ab.2022.114606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 02/06/2022] [Accepted: 02/13/2022] [Indexed: 12/14/2022]
Abstract
Type C hepatic encephalopathy (HE) is a complex neuropsychiatric disorder occurring as a consequence of chronic liver disease. Alterations in energy metabolism have been suggested in type C HE, but in vivo studies on this matter remain sparse and have reported conflicting results. Here, we propose a novel preclinical 18F-FDG PET methodology to compute quantitative 3D maps of the regional cerebral metabolic rate of glucose (CMRglc) from a labelling steady-state PET image of the brain and an image-derived input function. This quantitative approach shows its strength when comparing groups of animals with divergent physiology, such as HE animals. PET CMRglc maps were registered to an atlas and the mean CMRglc from the hippocampus and the cerebellum were associated to the corresponding localized 1H-MR spectroscopy acquisitions. This study provides for the first time local and quantitative information on both brain glucose uptake and neurometabolic profile alterations in a rat model of type C HE. A 2-fold lower brain glucose uptake, concomitant with an increase in brain glutamine and a decrease in the main osmolytes was observed in the hippocampus and in the cerebellum. These novel findings are an important step towards new insights into energy metabolism in the pathophysiology of HE.
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Affiliation(s)
- Jessie Mosso
- CIBM Center for Biomedical Imaging, Switzerland; Animal Imaging and Technology (AIT), EPFL, Lausanne, Switzerland; Laboratory for Functional and Metabolic Imaging (LIFMET), EPFL, Lausanne, Switzerland
| | - Ting Yin
- CIBM Center for Biomedical Imaging, Switzerland; Animal Imaging and Technology (AIT), EPFL, Lausanne, Switzerland
| | | | - Dunja Simicic
- CIBM Center for Biomedical Imaging, Switzerland; Animal Imaging and Technology (AIT), EPFL, Lausanne, Switzerland; Laboratory for Functional and Metabolic Imaging (LIFMET), EPFL, Lausanne, Switzerland
| | - Mario Lepore
- CIBM Center for Biomedical Imaging, Switzerland; Animal Imaging and Technology (AIT), EPFL, Lausanne, Switzerland
| | - Valérie A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva, And University of Geneva, Geneva, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Cristina Cudalbu
- CIBM Center for Biomedical Imaging, Switzerland; Animal Imaging and Technology (AIT), EPFL, Lausanne, Switzerland
| | - Bernard Lanz
- CIBM Center for Biomedical Imaging, Switzerland; Animal Imaging and Technology (AIT), EPFL, Lausanne, Switzerland; Laboratory for Functional and Metabolic Imaging (LIFMET), EPFL, Lausanne, Switzerland.
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14
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Worreth S, Bieger V, Rohr N, Astasov‐Frauenhoffer M, Töpper T, Osmani B, Braissant O. Cinnamaldehyde as antimicrobial in cellulose-based dental appliances. J Appl Microbiol 2022; 132:1018-1024. [PMID: 34480822 PMCID: PMC9292871 DOI: 10.1111/jam.15283] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 08/23/2021] [Accepted: 08/27/2021] [Indexed: 12/03/2022]
Abstract
AIMS In the context of minor orthodontic intervention using clear aligner technologies, we determined antimicrobial properties of a cellulose-based material loaded with essential oils such as cinnamaldehyde. METHODS AND RESULTS Isothermal microcalorimetry was used to assess the growth of bacterial biofilms at the interface between the tested material and the solid growth medium. The calorimetric data were analyzed using conventional growth models (Gompertz and Richards), and inhibition at 12 and 24 h was calculated. CONCLUSIONS The tested material showed antimicrobial properties against Staphylococcus epidermidis as well as Streptococcus mutans and Streptococcus mitis clinical isolates. The inhibition was more pronounced against S. epidermidis, for which growth rate was reduced by 70% and lag phase was extended by 12 h. For S. mutans and S. mitis, the decrease in growth rate was 20% and 10%, and the lag phase increased by 2 and 6 h, respectively. SIGNIFICANCE AND IMPACT Clear aligners for minor teeth alignment are becoming very popular. As they must be worn for at least 22 h per day for up to 40 weeks, it is important that they remain clean and do not promote caries formation or other oral infections. Therefore, introducing material with antimicrobial properties is expected to maintain oral hygiene during the aligner therapy. Here, we demonstrate the use of cinnamaldehyde for reducing microbial growth and biofilm formation on cellulose-based dental clear aligners.
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Affiliation(s)
- Sarah Worreth
- Department of Biomedical EngineeringUniversity of BaselAllschwilSwitzerland
- IUT Nancy‐BraboisUniversité de LorraineLieu‐dit Le MontetVillers‐lès‐NancyFrance
| | - Vivien Bieger
- Department ResearchUniversity Center for Dental MedicineUniversity of BaselBaselSwitzerland
| | - Nadja Rohr
- Department ResearchUniversity Center for Dental MedicineUniversity of BaselBaselSwitzerland
| | | | - Tino Töpper
- Bottmedical AGTechnologiepark BaselBaselSwitzerland
| | - Bekim Osmani
- Bottmedical AGTechnologiepark BaselBaselSwitzerland
| | - Olivier Braissant
- Department of Biomedical EngineeringUniversity of BaselAllschwilSwitzerland
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15
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Steiger J, Braissant O, Waltimo T, Astasov-Frauenhoffer M. Efficacy of Experimental Mouth Rinses on Caries-Related Biofilms in vitro. Front Oral Health 2022; 2:676028. [PMID: 35048021 PMCID: PMC8757722 DOI: 10.3389/froh.2021.676028] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 06/04/2021] [Indexed: 11/15/2022] Open
Abstract
This study assessed the efficacy of tin and Polyethylenglycol (PEG-3) tallow aminopropylamine in different concentrations on Streptococcus mutans (S. mutans) biofilms to establish a new screening process for different antimicrobial agents and to gain more information on the antibacterial effects of these agents on cariogenic biofilms. Isothermal microcalorimetry (IMC) was used to determine differences in two growth parameters: lag time and growth rate; additionally, reduction in active biofilms was calculated. Experimental mouth rinses with 400 and 800 ppm tin derived from stannous fluoride (SnF2) revealed results (43.4 and 49.9% active biofilm reduction, respectively) similar to meridol mouth rinse (400 ppm tin combined with 1,567 ppm PEG-3 tallow aminopropylamine; 55.3% active biofilm reduction) (p > 0.05), while no growth of S. mutans biofilms was detected during 72 h for samples treated with an experimental rinse containing 1,600 ppm tin (100% active biofilm reduction). Only the highest concentration (12,536 ppm) of rinses containing PEG-3 tallow aminopropylamine derived from amine fluoride (AmF) revealed comparable results to meridol (57.5% reduction in active biofilm). Lower concentrations of PEG-3 tallow aminopropylamine showed reductions of 16.9% for 3,134 ppm and 33.5% for 6,268 ppm. Maximum growth rate was significantly lower for all the samples containing SnF2 than for the samples containing control biofilms (p < 0.05); no differences were found between the control and all the PEG-3 tallow aminopropylamine (p > 0.05). The growth parameters showed high reproducibility rates within the treated groups of biofilms and for the controls; thus, the screening method provided reliable results.
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Affiliation(s)
- Josiana Steiger
- Clinic for Oral Health & Medicine, University Center for Dental Medicine Basel UZB University of Basel, Basel, Switzerland
| | - Olivier Braissant
- Department of Biomedical Engineering (DBE), Center of Biomechanics and Biocalorimetry, University of Basel, Allschwil, Switzerland
| | - Tuomas Waltimo
- Clinic for Oral Health & Medicine, University Center for Dental Medicine Basel UZB University of Basel, Basel, Switzerland
| | - Monika Astasov-Frauenhoffer
- Department Research, University Center for Dental Medicine Basel UZB University of Basel, Basel, Switzerland
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16
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Fernandes-Pires G, Braissant O. Current and potential new treatment strategies for creatine deficiency syndromes. Mol Genet Metab 2022; 135:15-26. [PMID: 34972654 DOI: 10.1016/j.ymgme.2021.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 12/14/2021] [Accepted: 12/14/2021] [Indexed: 12/16/2022]
Abstract
Creatine deficiency syndromes (CDS) are inherited metabolic disorders caused by mutations in GATM, GAMT and SLC6A8 and mainly affect central nervous system (CNS). AGAT- and GAMT-deficient patients lack the functional brain endogenous creatine (Cr) synthesis pathway but express the Cr transporter SLC6A8 at blood-brain barrier (BBB), and can thus be treated by oral supplementation of high doses of Cr. For Cr transporter deficiency (SLC6A8 deficiency or CTD), current treatment strategies benefit one-third of patients. However, as their phenotype is not completely reversed, and for the other two-thirds of CTD patients, the development of novel more effective therapies is needed. This article aims to review the current knowledge on Cr metabolism and CDS clinical aspects, highlighting their current treatment possibilities and the most recent research perspectives on CDS potential therapeutics designed, in particular, to bring new options for the treatment of CTD.
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Affiliation(s)
- Gabriella Fernandes-Pires
- Service of Clinical Chemistry, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland.
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17
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Kardas P, Astasov-Frauenhoffer M, Braissant O, Bornstein MM, Waltimo T. OUP accepted manuscript. FEMS Microbiol Lett 2022; 369:6551309. [PMID: 35311987 PMCID: PMC8973907 DOI: 10.1093/femsle/fnac028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/26/2022] [Accepted: 03/16/2022] [Indexed: 11/14/2022] Open
Abstract
This proof-of-principle study aims to find commensal oral bacteria that can produce extracellular polymeric substances (EPS), which have similar lubrication properties to saliva and could serve as saliva substitutes. Saliva and plaque samples were collected from 21 generally healthy individuals. Primary screening was done by conventional culturing and Gram-staining; all species selected for further analysis were identified by MALDI-TOF and deposited in DSMZ. Lactobacillus gasseri (DSM32453 and DSM32455), Lactobacillus rhamnosus (DSM32452), Lactobacillus paracasei (DSM32454), and Streptococcus sanguinis (DSM32456) produced 413.6, 415.7, 431.1, 426.8, and 877.6 µg/ml of EPS, respectively. At the same time calcium dissolution could not be detected for both L. gasseri strains, minimal dissolution for the other three: S. sanguinis 0.3 mm, and 3.7 mm for L. rhamnosus and L. paracasei. There were no differences found between the EPS samples and the saliva for the effect of shear rate on the viscosity and for the effect of sliding speed on lubrication properties. In conclusion, five commensal bacterial strains have been isolated, all able to produce EPS and lead to no or to low calcium dissolution. EPS produced exhibits rheological and tribological properties comparable to human saliva. A total of four out of five selected strains are probiotic and, therefore, may exhibit additional beneficial influence within the oral cavity.
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Affiliation(s)
| | - Monika Astasov-Frauenhoffer
- Corresponding author: Department Research, University Center for Dental Medicine Basel UZB, University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland. Tel: +41 6126 726 03; E-mail:
| | - Olivier Braissant
- Center of Biomechanics and Biocalorimetry, Department of Biomedical Engineering (DBE), University of Basel, Gewerbestrasse 14, 4123 Allschwil, Switzerland
| | - Michael M Bornstein
- Department Research, University Center for Dental Medicine Basel UZB, University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
- Department of Oral Health and Medicine, University Center for Dental Medicine Basel UZB, University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
| | - Tuomas Waltimo
- Department of Oral Health and Medicine, University Center for Dental Medicine Basel UZB, University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland
- Center of Salivary Diagnostics and Hyposalivation, University Center for Dental Medicine Basel UZB, University of Basel, Basel, Mattenstrasse 40, 4058, Switzerland
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18
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Pierzchala K, Simicic D, Sienkiewicz A, Sessa D, Mitrea S, Braissant O, McLin VA, Gruetter R, Cudalbu C. Central nervous system and systemic oxidative stress interplay with inflammation in a bile duct ligation rat model of type C hepatic encephalopathy. Free Radic Biol Med 2022; 178:295-307. [PMID: 34890769 DOI: 10.1016/j.freeradbiomed.2021.12.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/12/2021] [Accepted: 12/06/2021] [Indexed: 02/07/2023]
Abstract
The role and coexistence of oxidative stress (OS) and inflammation in type C hepatic encephalopathy (C HE) is a subject of intense debate. Under normal conditions the physiological levels of intracellular reactive oxygen species are controlled by the counteracting antioxidant response to maintain redox homeostasis. Our previous in-vivo1H-MRS studies revealed the longitudinal impairment of the antioxidant system (ascorbate) in a bile-duct ligation (BDL) rat model of type C HE. Therefore, the aim of this work was to examine the course of central nervous system (CNS) OS and systemic OS, as well as to check for their co-existence with inflammation in the BDL rat model of type C HE. To this end, we implemented a multidisciplinary approach, including ex-vivo and in-vitro electron paramagnetic resonance spectroscopy (EPR) spin-trapping, which was combined with UV-Vis spectroscopy, and histological assessments. We hypothesized that OS and inflammation act synergistically in the pathophysiology of type C HE. Our findings point to an increased CNS- and systemic-OS and inflammation over the course of type C HE progression. In particular, an increase in the CNS OS was observed as early as 2-weeks post-BDL, while the systemic OS became significant at week 6 post-BDL. The CNS EPR measurements were further validated by a substantial accumulation of 8-Oxo-2'-deoxyguanosine (Oxo-8-dG), a marker of oxidative DNA/RNA modifications on immunohistochemistry (IHC). Using IHC, we also detected increased synthesis of antioxidants, glutathione peroxidase 1 (GPX-1) and superoxide dismutases (i.e.Cu/ZnSOD (SOD1) and MnSOD (SOD2)), along with proinflammatory cytokine interleukin-6 (IL-6) in the brains of BDL rats. The presence of systemic inflammation was observed already at 2-weeks post-surgery. Thus, these results suggest that CNS OS is an early event in type C HE rat model, which seems to precede systemic OS. Finally, our results suggest that the increase in CNS OS is due to enhanced formation of intra- and extra-cellular ROS rather than due to reduced antioxidant capacity, and that OS in parallel with inflammation plays a significant role in type C HE.
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Affiliation(s)
- K Pierzchala
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Laboratory of Functional and Metabolic Imaging, EPFL, Lausanne, Switzerland.
| | - D Simicic
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Laboratory of Functional and Metabolic Imaging, EPFL, Lausanne, Switzerland
| | - A Sienkiewicz
- Laboratory for Quantum Magnetism, Institute of Physics, EPFL, Lausanne, Switzerland; ADSresonances Sàrl, Préverenges, Switzerland
| | - D Sessa
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva and University of Geneva, Geneva, Switzerland
| | - S Mitrea
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - O Braissant
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - V A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva and University of Geneva, Geneva, Switzerland
| | - R Gruetter
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Laboratory of Functional and Metabolic Imaging, EPFL, Lausanne, Switzerland
| | - C Cudalbu
- Center for Biomedical Imaging, EPFL, Lausanne, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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19
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Fontana AO, Gonzalez Melo M, Allenbach G, Georgantas C, Wang R, Braissant O, Barbey F, Prior JO, Ballhausen D, Viertl D. The use of 68Ga-EDTA PET allows detecting progressive decline of renal function in rats. Am J Nucl Med Mol Imaging 2021; 11:519-528. [PMID: 35003889 PMCID: PMC8727875] [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] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/08/2021] [Indexed: 06/14/2023]
Abstract
INTRODUCTION Evaluation of glomerular filtration rate is very important in both preclinical and clinical setting, especially in the context of chronic kidney disease. It is typically performed using 51Cr-EDTA or by imaging with 123I-Hippuran scintigraphy, which has a significantly lower resolution and sensitivity as compared to PET. 68Ga-EDTA represents a valid alternative due to its quick availability using a 68Ge/68Ga generator, while PET/CT enables both imaging of renal function and accurate quantitation of clearance of activity from both plasma and urine. Therefore, we aimed at investigating the use of 68Ga-EDTA as a preclinical tracer for determining renal function in a knock-in rat model known to present progressive decline of renal function. METHODS 68Ga-EDTA was injected in 23 rats, either wild type (n=10) or knock-in (n=13). By applying a unidirectional, two-compartment model and Rutland-Patlak Plot linear regression analysis, split renal function was determined from the age of 6 weeks to 12 months. RESULTS Glomerular filtration ranged from 0.025±0.01 ml/min at 6 weeks to 0.049±0.05 ml/min at 6 months in wild type rats. Glomerular filtration was significantly lower in knock-in rats at 6 and 12 months (P<0.01). No significant difference was observed in renal volumes between knock-in and wild type animals, based on imaging-derived volume calculations. CONCLUSIONS 68Ga-EDTA turned out to be a very promising PET/CT tracer for the evaluation of split renal function. This method allowed detection of progressive renal impairment in a knock-in rat model. Additional validation in a human cohort is warranted to further assess clinical utility in both, healthy individuals and patients with renal impairment.
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Affiliation(s)
- Andrea O Fontana
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
| | - Mary Gonzalez Melo
- Paediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of LausanneSwitzerland
| | - Gilles Allenbach
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
| | - Costa Georgantas
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
| | - Ruijia Wang
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
| | - Frederic Barbey
- Department of Immunology, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
| | - John O Prior
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
| | - Diana Ballhausen
- Paediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of LausanneSwitzerland
| | - David Viertl
- Department of Nuclear Medicine and Molecular Imaging, Lausanne University Hospital and University of LausanneCH-1011 Lausanne, Switzerland
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20
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Gonzalez Melo M, Fontana AO, Viertl D, Allenbach G, Prior JO, Rotman S, Feichtinger RG, Mayr JA, Costanzo M, Caterino M, Ruoppolo M, Braissant O, Barbey F, Ballhausen D. A knock-in rat model unravels acute and chronic renal toxicity in glutaric aciduria type I. Mol Genet Metab 2021; 134:287-300. [PMID: 34799272 DOI: 10.1016/j.ymgme.2021.10.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/21/2021] [Accepted: 10/22/2021] [Indexed: 01/14/2023]
Abstract
Glutaric aciduria type I (GA-I, OMIM # 231670) is an autosomal recessive inborn error of metabolism caused by deficiency of the mitochondrial enzyme glutaryl-CoA dehydrogenase (GCDH). The principal clinical manifestation in GA-I patients is striatal injury most often triggered by catabolic stress. Early diagnosis by newborn screening programs improved survival and reduced striatal damage in GA-I patients. However, the clinical phenotype is still evolving in the aging patient population. Evaluation of long-term outcome in GA-I patients recently identified glomerular filtration rate (GFR) decline with increasing age. We recently created the first knock-in rat model for GA-I harboring the mutation p.R411W (c.1231 C>T), corresponding to the most frequent GCDH human mutation p.R402W. In this study, we evaluated the effect of an acute metabolic stress in form of high lysine diet (HLD) on young Gcdhki/ki rats. We further studied the chronic effect of GCDH deficiency on kidney function in a longitudinal study on a cohort of Gcdhki/ki rats by repetitive 68Ga-EDTA positron emission tomography (PET) renography, biochemical and histological analyses. In young Gcdhki/ki rats exposed to HLD, we observed a GFR decline and biochemical signs of a tubulopathy. Histological analyses revealed lipophilic vacuoles, thinning of apical brush border membranes and increased numbers of mitochondria in proximal tubular (PT) cells. HLD also altered OXPHOS activities and proteome in kidneys of Gcdhki/ki rats. In the longitudinal cohort, we showed a progressive GFR decline in Gcdhki/ki rats starting at young adult age and a decline of renal clearance. Histopathological analyses in aged Gcdhki/ki rats revealed tubular dilatation, protein accumulation in PT cells and mononuclear infiltrations. These observations confirm that GA-I leads to acute and chronic renal damage. This raises questions on indication for follow-up on kidney function in GA-I patients and possible therapeutic interventions to avoid renal damage.
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Affiliation(s)
- Mary Gonzalez Melo
- Pediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of Lausanne, Switzerland.
| | - Andrea Orlando Fontana
- Department of Nuclear Medicine and Molecular Imaging, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland.
| | - David Viertl
- Department of Nuclear Medicine and Molecular Imaging, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland.
| | - Gilles Allenbach
- Department of Nuclear Medicine and Molecular Imaging, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland.
| | - John O Prior
- Department of Nuclear Medicine and Molecular Imaging, University of Lausanne and Lausanne University Hospital, Lausanne, Switzerland.
| | - Samuel Rotman
- Service of Clinical Pathology, University of Lausanne and University Hospital of Lausanne, Switzerland.
| | - René Günther Feichtinger
- Department of Pediatrics, University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria.
| | - Johannes Adalbert Mayr
- Department of Pediatrics, University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria.
| | - Michele Costanzo
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, 80131 Naples, Italy; CEINGE - Biotecnologie, Avanzate s.c.ar.l., 80145 Naples, Italy.
| | - Marianna Caterino
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, 80131 Naples, Italy; CEINGE - Biotecnologie, Avanzate s.c.ar.l., 80145 Naples, Italy.
| | - Margherita Ruoppolo
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, 80131 Naples, Italy; CEINGE - Biotecnologie, Avanzate s.c.ar.l., 80145 Naples, Italy.
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Switzerland.
| | - Frederic Barbey
- Department of Immunology, University of Lausanne and University Hospital of Lausanne, Switzerland.
| | - Diana Ballhausen
- Pediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of Lausanne, Switzerland.
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21
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Grütter AE, Lafranca T, Sigg AP, Mariotti M, Bonkat G, Braissant O. Detection and Drug Susceptibility Testing of Neisseria gonorrhoeae Using Isothermal Microcalorimetry. Microorganisms 2021; 9:microorganisms9112337. [PMID: 34835463 PMCID: PMC8624297 DOI: 10.3390/microorganisms9112337] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 11/08/2021] [Accepted: 11/08/2021] [Indexed: 11/23/2022] Open
Abstract
Background: Gonorrhea is a frequently encountered sexually transmitted disease that results in urethritis and can further lead to pelvic inflammatory disease, infertility, and possibly disseminated gonococcal infections. Thus, it must be diagnosed promptly and accurately. In addition, drug susceptibility testing should be performed rapidly as well. Unfortunately, Neisseria gonorrhoea is a fastidious microorganism that is difficult to grow and requires culturing in an opaque medium. Methods: Here, we used isothermal microcalorimetry (IMC) to monitor the growth and the antimicrobial susceptibility of N. gonorrhoea. Results: Using IMC, concentrations of N. gonorrhoea between 2000 and 1 CFU·mL−1 were detected within 12 to 33 h. In addition, drug susceptibility could be monitored easily. Conclusions: The use of isothermal microcalorimetry provides an interesting and useful tool to detect and characterize fastidious microbes such as N. gonorrhoea that require media incompatible with optical detection conventionally used in many commercial systems.
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Affiliation(s)
- Anabel E. Grütter
- Department of Biomedical Engineering, University of Basel, Gewerbestrasse 14, 4123 Allschwil, Switzerland; (A.E.G.); (T.L.); (A.P.S.); (M.M.)
| | - Tecla Lafranca
- Department of Biomedical Engineering, University of Basel, Gewerbestrasse 14, 4123 Allschwil, Switzerland; (A.E.G.); (T.L.); (A.P.S.); (M.M.)
| | - Aurelia Pahnita Sigg
- Department of Biomedical Engineering, University of Basel, Gewerbestrasse 14, 4123 Allschwil, Switzerland; (A.E.G.); (T.L.); (A.P.S.); (M.M.)
| | - Max Mariotti
- Department of Biomedical Engineering, University of Basel, Gewerbestrasse 14, 4123 Allschwil, Switzerland; (A.E.G.); (T.L.); (A.P.S.); (M.M.)
| | - Gernot Bonkat
- alta uro AG, Centralbahnplatz 6, 4051 Basel, Switzerland;
| | - Olivier Braissant
- Department of Biomedical Engineering, University of Basel, Gewerbestrasse 14, 4123 Allschwil, Switzerland; (A.E.G.); (T.L.); (A.P.S.); (M.M.)
- Correspondence:
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22
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Bravo D, Braissant O. Cadmium-tolerant bacteria: current trends and applications in agriculture. Lett Appl Microbiol 2021; 74:311-333. [PMID: 34714944 PMCID: PMC9299123 DOI: 10.1111/lam.13594] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [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: 08/04/2020] [Revised: 09/28/2021] [Accepted: 10/15/2021] [Indexed: 12/17/2022]
Abstract
Cadmium (Cd) is considered a toxic heavy metal; nevertheless, its toxicity fluctuates for different organisms. Cadmium-tolerant bacteria (CdtB) are diverse and non-phylogenetically related. Because of their ecological importance these bacteria become particularly relevant when pollution occurs and where human health is impacted. The aim of this review is to show the significance, culturable diversity, metabolic detoxification mechanisms of CdtB and their current uses in several bioremediation processes applied to agricultural soils. Further discussion addressed the technological devices and the possible advantages of genetically modified CdtB for diagnostic purposes in the future.
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Affiliation(s)
- D Bravo
- Laboratory of Soil Microbiology & Calorimetry, Corporación Colombiana de Investigación Agropecuaria AGROSAVIA, Mosquera, Colombia
| | - O Braissant
- Department of Biomedical Engineering, Faculty of Medicine, University of Basel, Allschwill, Switzerland
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23
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Flatt E, McLin VA, Braissant O, Pierzchala K, Mastromarino P, Mitrea SO, Sessa D, Gruetter R, Cudalbu C. Probiotics combined with rifaximin influence the neurometabolic changes in a rat model of type C HE. Sci Rep 2021; 11:17988. [PMID: 34504135 PMCID: PMC8429411 DOI: 10.1038/s41598-021-97018-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 08/12/2021] [Indexed: 02/07/2023] Open
Abstract
Type C hepatic encephalopathy (HE) is a neuropsychiatric disease caused by chronic liver disease. Management of type C HE remains an important challenge because treatment options are limited. Both the antibiotic rifaximin and probiotics have been reported to reduce the symptoms of HE, but longitudinal studies assessing their effects on brain metabolism are lacking and the molecular mechanisms underpinning their effects are not fully understood. Therefore, we evaluated in detail the effects of these different treatments on the neurometabolic changes associated with type C HE using a multimodal approach including ultra-high field in vivo 1H MRS. We analyzed longitudinally the effect of rifaximin alone or in combination with the probiotic Vivomixx on the brain metabolic profile in the hippocampus and cerebellum of bile duct ligated (BDL) rats, an established model of type C HE. Overall, while rifaximin alone appeared to induce no significant effect on the neurometabolic profile of BDL rats, its association with the probiotic resulted in more attenuated neurometabolic alterations in BDL rats followed longitudinally (i.e. a smaller increase in Gln and milder decrease in Glu and Cr levels). Given that both rifaximin and some probiotics are used in the treatment of HE, the implications of these findings may be clinically relevant.
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Affiliation(s)
- Emmanuelle Flatt
- Laboratory for Functional and Metabolic Imaging, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Valérie A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva, University of Geneva, Geneva, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Katarzyna Pierzchala
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland.,Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Paola Mastromarino
- Section of Microbiology, Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy
| | | | - Dario Sessa
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva, University of Geneva, Geneva, Switzerland
| | - Rolf Gruetter
- Laboratory for Functional and Metabolic Imaging, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Cristina Cudalbu
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland. .,Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
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24
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Gonzalez Melo M, Remacle N, Cudré-Cung HP, Roux C, Poms M, Cudalbu C, Barroso M, Gersting SW, Feichtinger RG, Mayr JA, Costanzo M, Caterino M, Ruoppolo M, Rüfenacht V, Häberle J, Braissant O, Ballhausen D. The first knock-in rat model for glutaric aciduria type I allows further insights into pathophysiology in brain and periphery. Mol Genet Metab 2021; 133:157-181. [PMID: 33965309 DOI: 10.1016/j.ymgme.2021.03.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/10/2021] [Accepted: 03/30/2021] [Indexed: 02/08/2023]
Abstract
Glutaric aciduria type I (GA-I, OMIM # 231670) is an inborn error of metabolism caused by a deficiency of glutaryl-CoA dehydrogenase (GCDH). Patients develop acute encephalopathic crises (AEC) with striatal injury most often triggered by catabolic stress. The pathophysiology of GA-I, particularly in brain, is still not fully understood. We generated the first knock-in rat model for GA-I by introduction of the mutation p.R411W, the rat sequence homologue of the most common Caucasian mutation p.R402W, into the Gcdh gene of Sprague Dawley rats by CRISPR/CAS9 technology. Homozygous Gcdhki/ki rats revealed a high excretor phenotype, but did not present any signs of AEC under normal diet (ND). Exposure to a high lysine diet (HLD, 4.7%) after weaning resulted in clinical and biochemical signs of AEC. A significant increase of plasmatic ammonium concentrations was found in Gcdhki/ki rats under HLD, accompanied by a decrease of urea concentrations and a concomitant increase of arginine excretion. This might indicate an inhibition of the urea cycle. Gcdhki/ki rats exposed to HLD showed highly diminished food intake resulting in severely decreased weight gain and moderate reduction of body mass index (BMI). This constellation suggests a loss of appetite. Under HLD, pipecolic acid increased significantly in cerebral and extra-cerebral liquids and tissues of Gcdhki/ki rats, but not in WT rats. It seems that Gcdhki/ki rats under HLD activate the pipecolate pathway for lysine degradation. Gcdhki/ki rat brains revealed depletion of free carnitine, microglial activation, astroglyosis, astrocytic death by apoptosis, increased vacuole numbers, impaired OXPHOS activities and neuronal damage. Under HLD, Gcdhki/ki rats showed imbalance of intra- and extracellular creatine concentrations and indirect signs of an intracerebral ammonium accumulation. We successfully created the first rat model for GA-I. Characterization of this Gcdhki/ki strain confirmed that it is a suitable model not only for the study of pathophysiological processes, but also for the development of new therapeutic interventions. We further brought up interesting new insights into the pathophysiology of GA-I in brain and periphery.
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Affiliation(s)
- Mary Gonzalez Melo
- Pediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of Lausanne, Switzerland.
| | - Noémie Remacle
- Pediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of Lausanne, Switzerland
| | - Hong-Phuc Cudré-Cung
- Pediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of Lausanne, Switzerland
| | - Clothilde Roux
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Switzerland.
| | - Martin Poms
- Klinische Chemie und Biochemie Universitäts-Kinderspital Zürich, Switzerland.
| | - Cristina Cudalbu
- CIBM Center for Biomedical Imaging, Switzerland; Animal Imaging and Technology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
| | - Madalena Barroso
- University Children's Research, UCR@Kinder-UKE, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Søren Waldemar Gersting
- University Children's Research, UCR@Kinder-UKE, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - René Günther Feichtinger
- Department of Pediatrics, University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria.
| | - Johannes Adalbert Mayr
- Department of Pediatrics, University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria.
| | - Michele Costanzo
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, 80131 Naples, Italy; CEINGE - Biotecnologie Avanzate s.c.ar.l., 80145 Naples, Italy.
| | - Marianna Caterino
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, 80131 Naples, Italy; CEINGE - Biotecnologie Avanzate s.c.ar.l., 80145 Naples, Italy.
| | - Margherita Ruoppolo
- Department of Molecular Medicine and Medical Biotechnology, School of Medicine, University of Naples Federico II, 80131 Naples, Italy; CEINGE - Biotecnologie Avanzate s.c.ar.l., 80145 Naples, Italy.
| | - Véronique Rüfenacht
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland.
| | - Johannes Häberle
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland.
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Switzerland.
| | - Diana Ballhausen
- Pediatric Metabolic Unit, Pediatrics, Woman-Mother-Child Department, University of Lausanne and University Hospital of Lausanne, Switzerland.
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25
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Tankeu AT, Van Winckel G, Campos-Xavier B, Braissant O, Pedro R, Superti-Furga A, Amati F, Tran C. Classical homocystinuria, is it safe to exercise? Mol Genet Metab Rep 2021; 27:100746. [PMID: 33868930 PMCID: PMC8042175 DOI: 10.1016/j.ymgmr.2021.100746] [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: 01/14/2021] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 10/25/2022] Open
Abstract
Background Cystationine β-synthase (CBS) deficiency is a genetic disorder characterized by severe hyperhomocysteinemia and thrombotic complications. In healthy individuals, physical exercise may result in a transient increase in plasma total homocysteine (tHcy) raising the possibility that exercise might be detrimental in CBS deficiency. Our main objective was to determine plasma tHcy kinetics in response to physical exercise in homocystinuria patients. Methods Six adult patients (2 males, 4 females) with homocystinuria and 6 age- and gender-matched controls completed a 30-min aerobic exercise of moderate-intensity with fixed power output (50 W for women and 100 W for men). Blood samples were drawn before, immediately, 180 min and 24 h after exercise. tHcy levels were determined by standard procedures; substrate oxidation and energy expenditure were measured using indirect calorimetry. Results Acute exercise was well tolerated and safe in patients and controls. During the exercise bout, heart rate and energy expenditure increased equally in both groups. tHcy levels were higher in patients compared to controls at all time points (p < 0.05). There was no significant effect of exercise on tHcy levels at any time point (p = 0.36). Although two patients with partial pyridoxine responsiveness presented higher homocysteine responses, their highest value remained below 55 μmol/l. Conclusions Overall metabolic responses to acute exercise were similar between homocystinuria patients and controls; specifically, exercise did not significantly change tHcy concentrations. Moderate physical exercise was well tolerated without any adverse event in our cohort of patients. Further studies are needed to identify the effects of different intensities and modes of exercise in larger cohorts of CBS patients with different levels of pyridoxine responsiveness.
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Affiliation(s)
- Aurel T Tankeu
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, School of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - Geraldine Van Winckel
- Center for Molecular Diseases, Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Belinda Campos-Xavier
- Center for Molecular Diseases, Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Switzerland
| | - Rosette Pedro
- Service of Endocrinology, Diabetes and Metabolism, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Andrea Superti-Furga
- Center for Molecular Diseases, Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Francesca Amati
- Aging and Muscle Metabolism Lab, Department of Biomedical Sciences, School of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.,Service of Endocrinology, Diabetes and Metabolism, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Christel Tran
- Center for Molecular Diseases, Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
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26
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Račkayová V, Simicic D, Donati G, Braissant O, Gruetter R, McLin VA, Cudalbu C. Late post-natal neurometabolic development in healthy male rats using 1 H and 31 P magnetic resonance spectroscopy. J Neurochem 2021; 157:508-519. [PMID: 33421129 DOI: 10.1111/jnc.15294] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 01/01/2020] [Accepted: 12/25/2020] [Indexed: 11/28/2022]
Abstract
Brain metabolism evolves rapidly during early post-natal development in the rat. While changes in amino acids, energy metabolites, antioxidants or metabolites involved in phospholipid metabolism have been reported in the early stages, neurometabolic changes during the later post-natal period are less well characterized. Therefore, we aimed to assess the neurometabolic changes in male Wistar rats between post-natal days 29 and 77 (p29-p77) using longitudinal magnetic resonance spectroscopy (MRS) in vivo at 9.4 Tesla. 1 H MRS was performed in the hippocampus between p29 and p77 at 1-week intervals (n = 7) and in the cerebellum between p35 and p77 at 2-week intervals (n = 7) using the SPECIAL sequence at ultra-short echo-time. NOE enhanced and 1 H decoupled 31 P MR spectra were acquired at p35, p48 and p63 (n = 7) in a larger voxel covering cortex, hippocampus and part of the striatum. The hippocampus showed a decrease in taurine concentration and an increase in glutamate (with more pronounced changes until p49), seemingly a continuation of their well-described changes in the early post-natal period. A constant increase in myo-inositol and choline-containing compounds in the hippocampus (in particular glycero-phosphocholine as shown by 31 P MRS) was measured throughout the observation period, probably related to membrane metabolism and myelination. The cerebellum showed only a significant increase in myo-inositol between p35 and p77. In conclusion, this study showed important changes in brain metabolites in both the hippocampus and cerebellum in the later post-natal period (p29/p35-p77) of male rats, something previously unreported. Based on these novel data, changes in some neurometabolites beyond p28-35, conventionally accepted as the cut off for adulthood, should be taken into account in both experimental design and data interpretation in this animal model.
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Affiliation(s)
- Veronika Račkayová
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland.,Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland.,Laboratory of Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Dunja Simicic
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland.,Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland.,Laboratory of Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Guillaume Donati
- Laboratory of Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - Rolf Gruetter
- Laboratory of Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
| | - Valérie A McLin
- Swiss Pediatric Liver Center, University Hospitals Geneva, Geneva, Switzerland.,Department of Pediatrics, Gynecology, and Obstetrics, University of Geneva Medical School, Geneva, Switzerland
| | - Cristina Cudalbu
- CIBM Center for Biomedical Imaging, Lausanne, Switzerland.,Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
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27
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Rackayová V, Flatt E, Braissant O, Grosse J, Capobianco D, Mastromarino P, McMillin M, DeMorrow S, McLin VA, Cudalbu C. Probiotics improve the neurometabolic profile of rats with chronic cholestatic liver disease. Sci Rep 2021; 11:2269. [PMID: 33500487 PMCID: PMC7838316 DOI: 10.1038/s41598-021-81871-8] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 12/23/2020] [Indexed: 02/06/2023] Open
Abstract
Chronic liver disease leads to neuropsychiatric complications called hepatic encephalopathy (HE). Current treatments have some limitations in their efficacy and tolerability, emphasizing the need for alternative therapies. Modulation of gut bacterial flora using probiotics is emerging as a therapeutic alternative. However, knowledge about how probiotics influence brain metabolite changes during HE is missing. In the present study, we combined the advantages of ultra-high field in vivo 1H MRS with behavioural tests to analyse whether a long-term treatment with a multistrain probiotic mixture (VIVOMIXX) in a rat model of type C HE had a positive effect on behaviour and neurometabolic changes. We showed that the prophylactic administration of this probiotic formulation led to an increase in gut Bifidobacteria and attenuated changes in locomotor activity and neurometabolic profile in a rat model of type C HE. Both the performance in behavioural tests and the neurometabolic profile of BDL + probiotic rats were improved compared to the BDL group at week 8 post-BDL. They displayed a significantly lesser increase in brain Gln, a milder decrease in brain mIns and a smaller decrease in neurotransmitter Glu than untreated animals. The clinical implications of these findings are potentially far-reaching given that probiotics are generally safe and well-tolerated by patients.
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Affiliation(s)
- Veronika Rackayová
- Laboratory for Functional and Metabolic Imaging, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Center for Biomedical Imaging, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Vaud, Switzerland
| | - Emmanuelle Flatt
- Laboratory for Functional and Metabolic Imaging, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - Jocelyn Grosse
- Laboratory of Behavioral Genetics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Daniela Capobianco
- Department of Public Health and Infectious Diseases, Section of Microbiology, Sapienza University of Rome, Rome, Italy
| | - Paola Mastromarino
- Department of Public Health and Infectious Diseases, Section of Microbiology, Sapienza University of Rome, Rome, Italy
| | - Matthew McMillin
- Department of Internal Medicine, Dell Medical School, The University of Texas at Austin, Austin, TX, USA
- Central Texas Veterans Health Care System, Temple, TX, USA
| | - Sharon DeMorrow
- Department of Internal Medicine, Dell Medical School, The University of Texas at Austin, Austin, TX, USA
- Central Texas Veterans Health Care System, Temple, TX, USA
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, TX, USA
| | - Valérie A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University of Geneva and University Hospitals Geneva, Geneva, Switzerland
| | - Cristina Cudalbu
- Center for Biomedical Imaging, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Vaud, Switzerland.
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Duran-Trio L, Fernandes-Pires G, Simicic D, Grosse J, Roux-Petronelli C, Bruce SJ, Binz PA, Sandi C, Cudalbu C, Braissant O. A new rat model of creatine transporter deficiency reveals behavioral disorder and altered brain metabolism. Sci Rep 2021; 11:1636. [PMID: 33452333 PMCID: PMC7810893 DOI: 10.1038/s41598-020-80824-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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: 08/13/2020] [Accepted: 12/28/2020] [Indexed: 11/10/2022] Open
Abstract
Creatine is an organic compound used as fast phosphate energy buffer to recycle ATP, important in tissues with high energy demand such as muscle or brain. Creatine is taken from the diet or endogenously synthetized by the enzymes AGAT and GAMT, and specifically taken up by the transporter SLC6A8. Deficit in the endogenous synthesis or in the transport leads to Cerebral Creatine Deficiency Syndromes (CCDS). CCDS are characterized by brain creatine deficiency, intellectual disability with severe speech delay, behavioral troubles such as attention deficits and/or autistic features, and epilepsy. Among CCDS, the X-linked creatine transporter deficiency (CTD) is the most prevalent with no efficient treatment so far. Different mouse models of CTD were generated by doing long deletions in the Slc6a8 gene showing reduced brain creatine and cognitive deficiencies or impaired motor function. We present a new knock-in (KI) rat model of CTD holding an identical point mutation found in patients with reported lack of transporter activity. KI males showed brain creatine deficiency, increased urinary creatine/creatinine ratio, cognitive deficits and autistic-like traits. The Slc6a8Y389C KI rat fairly enriches the spectrum of CTD models and provides new data about the pathology, being the first animal model of CTD carrying a point mutation.
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Affiliation(s)
- Lara Duran-Trio
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Rue du Bugnon 46, 1011, Lausanne, Switzerland
| | - Gabriella Fernandes-Pires
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Rue du Bugnon 46, 1011, Lausanne, Switzerland
| | - Dunja Simicic
- Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Jocelyn Grosse
- Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Clothilde Roux-Petronelli
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Rue du Bugnon 46, 1011, Lausanne, Switzerland
| | - Stephen J Bruce
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Rue du Bugnon 46, 1011, Lausanne, Switzerland
| | - Pierre-Alain Binz
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Rue du Bugnon 46, 1011, Lausanne, Switzerland
| | - Carmen Sandi
- Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Cristina Cudalbu
- Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Rue du Bugnon 46, 1011, Lausanne, Switzerland.
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Braissant O, Astasov-Frauenhoffer M, Waltimo T, Bonkat G. A Review of Methods to Determine Viability, Vitality, and Metabolic Rates in Microbiology. Front Microbiol 2020; 11:547458. [PMID: 33281753 PMCID: PMC7705206 DOI: 10.3389/fmicb.2020.547458] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 10/08/2020] [Indexed: 12/21/2022] Open
Abstract
Viability and metabolic assays are commonly used as proxies to assess the overall metabolism of microorganisms. The variety of these assays combined with little information provided by some assay kits or online protocols often leads to mistakes or poor interpretation of the results. In addition, the use of some of these assays is restricted to simple systems (mostly pure cultures), and care must be taken in their application to environmental samples. In this review, the necessary data are compiled to understand the reactions or measurements performed in many of the assays commonly used in various aspects of microbiology. Also, their relationships to each other, as metabolism links many of these assays, resulting in correlations between measured values and parameters, are discussed. Finally, the limitations of these assays are discussed.
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Affiliation(s)
- Olivier Braissant
- Department of Biomedical Engineering, Faculty of Medicine, University of Basel, Allschwil, Switzerland
| | | | - Tuomas Waltimo
- Department Research, University Center for Dental Medicine, University of Basel, Basel, Switzerland
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Steiger EL, Muelli JR, Braissant O, Waltimo T, Astasov-Frauenhoffer M. Effect of divalent ions on cariogenic biofilm formation. BMC Microbiol 2020; 20:287. [PMID: 32938382 PMCID: PMC7493384 DOI: 10.1186/s12866-020-01973-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 09/10/2020] [Indexed: 02/04/2023] Open
Abstract
Background Divalent cations are able to interact with exopolysaccharides (EPS) and thus are capable to modify the structure and composition of dental biofilm. At the moment, little is known about the adsorption of metals by cariogenic EPS; thus, the aim of the present study was to evaluate the effect of divalent ions (calcium, magnesium, and zinc) on the growth and biofilm formation of mutans streptococci and on the dissolution of hydroxyapatite as well as to investigate their binding to the bacterial EPS. Results S. mutans strains used in this study show the highest tolerance towards calcium of the ions tested. Growth parameters showed no differences to control condition for both strains up to 100 mM; revealing natural tolerance to higher concentration of calcium in the surroundings. Although excessive levels of calcium did not impair the growth parameters, it also did not have a positive effect on biofilm formation or its binding affinity to EPS. Magnesium-saturated environment proved to be counterproductive as strains were able to dissolve more Ca2+ from the tooth surface in the presence of magnesium, therefore releasing excessive amounts of Ca2+ in the environment and leading to the progression of the disease. Thus, this supports the idea of self-regulation, when more Ca2+ is released, more calcium is bound to the biofilm strengthening its structure and however, also less is left for remineralization. Zinc inhibited bacterial adhesion already at low concentrations and had a strong antibacterial effect on the strains as well as on calcium dissolution; leading to less biofilm and less EPS. Additionally, Zn2+ had almost always the lowest affinity to all EPS; thus, the unbound zinc could also still remain in the surrounding environment and keep its antimicrobial properties. Conclusion It is important to maintain a stable relationship between calcium, magnesium and zinc as excessive concentrations of one can easily destroy the balance between the three in cariogenic environment and lead to progression of the disease.
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Affiliation(s)
- Elena Laura Steiger
- Department for Oral Health & Medicine, University Center for Dental Medicine (UZB), University of Basel, Mattenstrasse 40, 4058, Basel, Switzerland
| | - Julia Rahel Muelli
- Department for Oral Health & Medicine, University Center for Dental Medicine (UZB), University of Basel, Mattenstrasse 40, 4058, Basel, Switzerland
| | - Olivier Braissant
- Center of Biomechanics and Biocalorimetry, c/o Department of Biomedical Engineering (DBE), University of Basel, Gewerbestrasse 14, 4123, Allschwil, Switzerland
| | - Tuomas Waltimo
- Department for Oral Health & Medicine, University Center for Dental Medicine (UZB), University of Basel, Mattenstrasse 40, 4058, Basel, Switzerland
| | - Monika Astasov-Frauenhoffer
- Department Research, University Center for Dental Medicine (UZB), University of Basel, Mattenstrasse 40, 4058, Basel, Switzerland.
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Lanz B, Abaei A, Braissant O, Choi IY, Cudalbu C, Henry PG, Gruetter R, Kara F, Kantarci K, Lee P, Lutz NW, Marjańska M, Mlynárik V, Rasche V, Xin L, Valette J. Magnetic resonance spectroscopy in the rodent brain: Experts' consensus recommendations. NMR Biomed 2020; 34:e4325. [PMID: 33565219 PMCID: PMC9429976 DOI: 10.1002/nbm.4325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 03/29/2020] [Accepted: 04/30/2020] [Indexed: 05/21/2023]
Abstract
In vivo MRS is a non-invasive measurement technique used not only in humans, but also in animal models using high-field magnets. MRS enables the measurement of metabolite concentrations as well as metabolic rates and their modifications in healthy animals and disease models. Such data open the way to a deeper understanding of the underlying biochemistry, related disturbances and mechanisms taking place during or prior to symptoms and tissue changes. In this work, we focus on the main preclinical 1H, 31P and 13C MRS approaches to study brain metabolism in rodent models, with the aim of providing general experts' consensus recommendations (animal models, anesthesia, data acquisition protocols). An overview of the main practical differences in preclinical compared with clinical MRS studies is presented, as well as the additional biochemical information that can be obtained in animal models in terms of metabolite concentrations and metabolic flux measurements. The properties of high-field preclinical MRS and the technical limitations are also described.
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Affiliation(s)
- Bernard Lanz
- Laboratory for Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
- Sir Peter Mansfield Imaging Centre, School of Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Alireza Abaei
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - In-Young Choi
- Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas, US
| | - Cristina Cudalbu
- Centre d’Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Pierre-Gilles Henry
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, Minnesota, US
| | - Rolf Gruetter
- Laboratory for Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Firat Kara
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, US
| | - Kejal Kantarci
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, US
| | - Phil Lee
- Department of Radiology, University of Kansas Medical Center, Kansas City, Kansas, US
| | | | - Małgorzata Marjańska
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, Minnesota, US
| | - Vladimír Mlynárik
- High Field MR Centre, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Volker Rasche
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Lijing Xin
- Centre d’Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Julien Valette
- Commissariat à l’Energie Atomique et aux Energies Alternatives, MIRCen, Fontenay-aux-Roses, France
- Neurodegenerative Diseases Laboratory, Centre National de la Recherche Scientifique, Université Paris-Sud, Université Paris-Saclay, UMR 9199, Fontenay-aux-Roses, France
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Fesser AF, Braissant O, Olmo F, Kelly JM, Mäser P, Kaiser M. Non-invasive monitoring of drug action: A new live in vitro assay design for Chagas' disease drug discovery. PLoS Negl Trop Dis 2020; 14:e0008487. [PMID: 32716934 PMCID: PMC7419005 DOI: 10.1371/journal.pntd.0008487] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 08/11/2020] [Accepted: 06/15/2020] [Indexed: 02/06/2023] Open
Abstract
New assay designs are needed to improve the predictive value of the Trypanosoma cruzi in vitro tests used as part of the Chagas' disease drug development pipeline. Here, we employed a green fluorescent protein (eGFP)-expressing parasite line and live high-content imaging to monitor the growth of T. cruzi amastigotes in mouse embryonic fibroblasts. A novel assay design allowed us to follow parasite numbers over 6 days, in four-hour intervals, while occupying the microscope for only 24 hours per biological replicate. Dose-response curves were calculated for each time point after addition of test compounds, revealing how EC50 values first decreased over the time of drug exposure, and then leveled off. However, we observed that parasite numbers could vary, even in the untreated controls, and at different sites in the same well, which caused variability in the EC50 values. To overcome this, we established that fold change in parasite number per hour is a more robust and informative measure of drug activity. This was calculated based on an exponential growth model for every biological sample. The net fold change per hour is the result of parasite replication, differentiation, and death. The calculation of this fold change enabled us to determine the tipping point of drug action, i.e. the time point when the death rate of the parasites exceeded the growth rate and the fold change dropped below 1, depending on the drug concentration and exposure time. This revealed specific pharmacodynamic profiles of the benchmark drugs benznidazole and posaconazole. Chagas' disease, caused by Trypanosoma cruzi, is a chronic debilitating infection occurring mostly in Latin America. There is an urgent need for new, well tolerated drugs. However, the latest therapeutic candidates have yielded disappointing outcomes in clinical trials, despite promising preclinical results. This demands new and more predictive in vitro assays. To address this, we have developed an assay design that enables the growth of T. cruzi intracellular forms to be monitored in real time, under drug pressure, for 6 days post-infection. This allowed us to establish the tipping point of drug action, when the death rate of the parasites exceeded the growth rate. The resulting pharmacodynamics profiles can provide robust and informative details on anti-chagasic candidates, as demonstrated for the benchmark drugs benznidazole and posaconazole.
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Affiliation(s)
- Anna F. Fesser
- Medical Parasitology and Infection Biology, Swiss Tropical & Public Health Institute, Switzerland
- University of Basel, Basel, Switzerland
| | - Olivier Braissant
- Department of Biomedical Engineering, University of Basel, Basel, Switzerland
| | - Francisco Olmo
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - John M. Kelly
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Pascal Mäser
- Medical Parasitology and Infection Biology, Swiss Tropical & Public Health Institute, Switzerland
- University of Basel, Basel, Switzerland
- * E-mail:
| | - Marcel Kaiser
- Medical Parasitology and Infection Biology, Swiss Tropical & Public Health Institute, Switzerland
- University of Basel, Basel, Switzerland
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Braissant O, Theron G, Friedrich SO, Diacon AH, Bonkat G. Comparison of isothermal microcalorimetry and BACTEC MGIT960 for the detection of the metabolic activity of Mycobacterium tuberculosis in sputum samples. J Appl Microbiol 2019; 128:1497-1502. [PMID: 31834654 DOI: 10.1111/jam.14549] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 11/19/2019] [Accepted: 12/08/2019] [Indexed: 02/04/2023]
Abstract
INTRODUCTION This study explores the uses of microcalorimetry to detect Mycobacterium tuberculosis (TB) in sputum. Microcalorimetry measures metabolic heat evolution during cellular proliferation of tuberculosis (TB) and is considered as a possible alternative to conventional diagnostic tools. OBJECTIVES To compare the time to detection (TTD) from the BACTEC™ MGIT™ 960 and the calScreener™ calorimetric system. METHODS Sixty-four sputa samples were selected from patients with confirmed pulmonary tuberculosis. Those sample were then decontaminated and analysed using calorimetry and BACTEC MGIT 960 system. RESULTS The incubation period until detection of M. tuberculosis in the sample was 8·5 ± 3·7 days for the MGIT system and 10·1 ± 4·1 days (mean ± SD) for calorimetry. CONCLUSIONS The microincubations in the 48-well format calScreener offers potential for rapid and accurate diagnostic of TB in different samples. Although TTD from calorimetry is still longer than with the MGIT, our findings suggest that several improvements are possible. Still, the instrument is ideal for continuous, real-time analysis of net metabolic heat release of limited sample numbers. SIGNIFICANCE AND IMPACT OF THE STUDY Our result emphasizes that with further optimization, calorimetry can become an alternative detection method for tuberculosis.
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Affiliation(s)
- O Braissant
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
| | - G Theron
- TASK Applied Science, Bellville, Cape Town, South Africa
| | - S O Friedrich
- TASK Applied Science, Bellville, Cape Town, South Africa.,Division of Medical Physiology, Faculty of Medicine and Health Sciences, MRC Centre for Tuberculosis Research, Stellenbosch University, Tygerberg, South Africa
| | - A H Diacon
- TASK Applied Science, Bellville, Cape Town, South Africa.,Division of Medical Physiology, Faculty of Medicine and Health Sciences, MRC Centre for Tuberculosis Research, Stellenbosch University, Tygerberg, South Africa
| | - G Bonkat
- Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland.,Alta-Uro AG, Basel, Switzerland
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Diez-Fernandez C, Hertig D, Loup M, Diserens G, Henry H, Vermathen P, Nuoffer JM, Häberle J, Braissant O. Argininosuccinate neurotoxicity and prevention by creatine in argininosuccinate lyase deficiency: An in vitro study in rat three-dimensional organotypic brain cell cultures. J Inherit Metab Dis 2019; 42:1077-1087. [PMID: 30907007 DOI: 10.1002/jimd.12090] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 03/04/2019] [Accepted: 03/22/2019] [Indexed: 12/31/2022]
Abstract
The urea cycle disorder (UCD) argininosuccinate lyase (ASL) deficiency, caused by a defective ASL enzyme, exhibits a wide range of phenotypes, from life-threatening neonatal hyperammonemia to asymptomatic patients, with only the biochemical marker argininosuccinic acid (ASA) elevated in body fluids. Remarkably, even without ever suffering from hyperammonemia, patients often develop severe cognitive impairment and seizures. The goal of this study was to understand the effect on the known toxic metabolite ASA and the assumed toxic metabolite guanidinosuccinic acid (GSA) on developing brain cells, and to evaluate the potential role of creatine (Cr) supplementation, as it was described protective for brain cells exposed to ammonia. We used an in vitro model, in which we exposed three-dimensional (3D) organotypic rat brain cell cultures in aggregates to different combinations of the metabolites of interest at two time points (representing two different developmental stages). After harvest and cryopreservation of the cell cultures, the samples were analyzed mainly by metabolite analysis, immunohistochemistry, and western blotting. ASA and GSA were found toxic for astrocytes and neurons. This toxicity could be reverted in vitro by Cr. As well, an antiapoptotic effect of ASA was revealed, which could contribute to the neurotoxicity in ASL deficiency. Further studies in human ASL deficiency will be required to understand the biochemical situation in the brain of affected patients, and to investigate the impact of high or low arginine doses on brain Cr availability. In addition, clinical trials to evaluate the beneficial effect of Cr supplementation in ASL deficiency would be valuable.
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Affiliation(s)
- Carmen Diez-Fernandez
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Damian Hertig
- Division of Pediatric Endocrinology, Diabetology and Metabolism and University Institute of Clinical Chemistry, Inselspital, University Hospital, University of Bern, Bern, Switzerland
- AMSM, Department of Biomedical Research, University of Bern, Bern, Switzerland
- AMSM, Department of Radiology, University of Bern, Bern, Switzerland
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Marc Loup
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Switzerland
| | - Gaelle Diserens
- AMSM, Department of Biomedical Research, University of Bern, Bern, Switzerland
- AMSM, Department of Radiology, University of Bern, Bern, Switzerland
| | - Hugues Henry
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Switzerland
| | - Peter Vermathen
- AMSM, Department of Biomedical Research, University of Bern, Bern, Switzerland
- AMSM, Department of Radiology, University of Bern, Bern, Switzerland
| | - Jean-Marc Nuoffer
- Division of Pediatric Endocrinology, Diabetology and Metabolism and University Institute of Clinical Chemistry, Inselspital, University Hospital, University of Bern, Bern, Switzerland
| | - Johannes Häberle
- Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital and University of Lausanne, Switzerland
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McLin VA, Braissant O, Cudalbu C. Reply to: "Magnetic resonance spectroscopy: A surrogate marker of hepatic encephalopathy?". J Hepatol 2019; 71:1057. [PMID: 31500857 DOI: 10.1016/j.jhep.2019.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 08/06/2019] [Indexed: 12/04/2022]
Affiliation(s)
- Valérie A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva, and University of Geneva Medical School, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - Cristina Cudalbu
- Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
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Gros SJ, Holland-Cunz SG, Supuran CT, Braissant O. Personalized Treatment Response Assessment for Rare Childhood Tumors Using Microcalorimetry-Exemplified by Use of Carbonic Anhydrase IX and Aquaporin 1 Inhibitors. Int J Mol Sci 2019; 20:ijms20204984. [PMID: 31600976 PMCID: PMC6834116 DOI: 10.3390/ijms20204984] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 10/03/2019] [Accepted: 10/05/2019] [Indexed: 12/19/2022] Open
Abstract
We present a novel approach to a personalized therapeutic concept for solid tumors. We illustrate this on a rare childhood tumor for which only a generalized treatment concept exists using carbonic anhydrase IX and aquaporin 1 inhibitors. The use of microcalorimetry as a refined in vitro method for evaluation of drug susceptibility in organotypic slice culture has not previously been established. Rapid microcalorimetric drug response assessment can refine a general treatment concept when it is applied in cases in which tumors do not respond to conventional chemo-radiation treatment. For solid tumors, which do not respond to classical treatment, and especially for rare tumors without an established protocol rapid microcalorimetric drug response testing presents an elegant novel approach to test alternative therapeutic approaches. While improved treatment concepts have led to improved outcome over the past decades, the prognosis of high risk disease is still poor and rethinking of clinical trial design is necessary. A small patient population combined with the necessity to assess experimental therapies for rare solid tumors rather at the time of diagnosis than in relapsed or refractory patients provides great challenges. The possibility to rapidly compare established protocols with innovative therapeutics presents an elegant novel approach to refine and personalize treatment.
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Affiliation(s)
- Stephanie J Gros
- Department of Pediatric Surgery, University Children's Hospital Basel, 4031 Basel, Switzerland.
| | - Stefan G Holland-Cunz
- Department of Pediatric Surgery, University Children's Hospital Basel, 4031 Basel, Switzerland.
| | - Claudiu T Supuran
- Department Neurofarba, Sezione di Scienze farmaceutiche, University of Florence, 50139 Florence, Italy.
| | - Olivier Braissant
- Biological Calorimetry Lab, Department of Biomedical Engineering, University of Basel, 4123 Allschwil, Basel, Switzerland.
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Braissant O, Rackayová V, Pierzchala K, Grosse J, McLin VA, Cudalbu C. Longitudinal neurometabolic changes in the hippocampus of a rat model of chronic hepatic encephalopathy. J Hepatol 2019; 71:505-515. [PMID: 31173812 DOI: 10.1016/j.jhep.2019.05.022] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 05/24/2019] [Accepted: 05/27/2019] [Indexed: 12/20/2022]
Abstract
BACKGROUND & AIMS The sequence of events in hepatic encephalopathy (HE) remains unclear. Using the advantages of in vivo 1H-MRS (9.4T) we aimed to analyse the time-course of disease in an established model of type C HE by analysing the longitudinal changes in a large number of brain metabolites together with biochemical, histological and behavioural assessment. We hypothesized that neurometabolic changes are detectable very early, and that these early changes will offer insight into the primary events underpinning HE. METHODS Wistar rats underwent bile-duct ligation (BDL) and were studied before BDL and at post-operative weeks 2, 4, 6 and 8 (n = 26). In vivo short echo-time 1H-MRS (9.4T) of the hippocampus was performed in a longitudinal manner, as were biochemical (plasma), histological and behavioural tests. RESULTS Plasma ammonium increased early after BDL and remained high during the study. Brain glutamine increased (+47%) as early as 2-4 weeks post-BDL while creatine (-8%) and ascorbate (-12%) decreased. Brain glutamine and ascorbate correlated closely with rising plasma ammonium, while brain creatine correlated with brain glutamine. The increases in brain glutamine and plasma ammonium were correlated, while plasma ammonium correlated negatively with distance moved. Changes in astrocyte morphology were observed at 4 weeks. These early changes were further accentuated at 6-8 weeks post-BDL, concurrently with the known decreases in brain organic osmolytes. CONCLUSION Using a multimodal, in vivo and longitudinal approach we have shown that neurometabolic changes are already noticeable 2 weeks after BDL. These early changes are suggestive of osmotic/oxidative stress and are likely the premise of some later changes. Early decreases in cerebral creatine and ascorbate are novel findings offering new avenues to explore neuroprotective strategies for HE treatment. LAY SUMMARY The sequence of events in chronic hepatic encephalopathy (HE) remains unclear, therefore using the advantages of in vivo proton magnetic resonance spectroscopy at 9.4T we aimed to test the hypothesis that neurometabolic changes are detectable very early in an established model of type C HE, offering insight into the primary events underpinning HE, before advanced liver disease confounds the findings. These early, previously unreported neurometabolic changes occurred as early as 2 to 4 weeks after bile-duct ligation, namely an increase in plasma ammonium and brain glutamine, a decrease in brain creatine and ascorbate together with behavioural and astrocyte morphology changes, and continued to progress throughout the 8-week course of the disease.
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Affiliation(s)
- Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - Veronika Rackayová
- Laboratory of Functional and Metabolic Imaging, Center for Biomedical Imaging, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland; Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Katarzyna Pierzchala
- Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Jocelyn Grosse
- Laboratory of Behavioral Genetics, Brain Mind Institute, School Of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Valérie A McLin
- Swiss Pediatric Liver Center, Department of Pediatrics, Gynecology and Obstetrics, University Hospitals Geneva, and University of Geneva Medical School, Switzerland
| | - Cristina Cudalbu
- Centre d'Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
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Cudré-Cung HP, Remacle N, do Vale-Pereira S, Gonzalez M, Henry H, Ivanisevic J, Schmiesing J, Mühlhausen C, Braissant O, Ballhausen D. Ammonium accumulation and chemokine decrease in culture media of Gcdh -/- 3D reaggregated brain cell cultures. Mol Genet Metab 2019; 126:416-428. [PMID: 30686684 DOI: 10.1016/j.ymgme.2019.01.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 01/15/2019] [Accepted: 01/15/2019] [Indexed: 01/05/2023]
Abstract
Glutaric Aciduria type I (GA-I) is caused by mutations in the GCDH gene. Its deficiency results in accumulation of the key metabolites glutaric acid (GA) and 3-hydroxyglutaric acid (3-OHGA) in body tissues and fluids. Present knowledge on the neuropathogenesis of GA-I suggests that GA and 3-OHGA have toxic properties on the developing brain. We analyzed morphological and biochemical features of 3D brain cell aggregates issued from Gcdh-/- mice at two different developmental stages, day-in-vitro (DIV) 8 and 14, corresponding to the neonatal period and early childhood. We also induced a metabolic stress by exposing the aggregates to 10 mM l-lysine (Lys). Significant amounts of GA and 3-OHGA were detected in Gcdh-/- aggregates and their culture media. Ammonium was significantly increased in culture media of Gcdh-/- aggregates at the early developmental stage. Concentrations of GA, 3-OHGA and ammonium increased significantly after exposure to Lys. Gcdh-/- aggregates manifested morphological alterations of all brain cell types at DIV 8 while at DIV 14 they were only visible after exposure to Lys. Several chemokine levels were significantly decreased in culture media of Gcdh-/- aggregates at DIV 14 and after exposure to Lys at DIV 8. This new in vitro model for brain damage in GA-I mimics well in vivo conditions. As seen previously in WT aggregates exposed to 3-OHGA, we confirmed a significant ammonium production by immature Gcdh-/- brain cells. We described for the first time a decrease of chemokines in Gcdh-/- culture media which might contribute to brain cell injury in GA-I.
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Affiliation(s)
- Hong-Phuc Cudré-Cung
- Pediatric Metabolic Disease Unit, Department of Pediatrics, Lausanne University Hospital, Chemin de Mont-Paisible 18, 1011 Lausanne, Switzerland.
| | - Noémie Remacle
- Pediatric Metabolic Disease Unit, Department of Pediatrics, Lausanne University Hospital, Chemin de Mont-Paisible 18, 1011 Lausanne, Switzerland.
| | - Sonia do Vale-Pereira
- Pediatric Metabolic Disease Unit, Department of Pediatrics, Lausanne University Hospital, Chemin de Mont-Paisible 18, 1011 Lausanne, Switzerland
| | - Mary Gonzalez
- Pediatric Metabolic Disease Unit, Department of Pediatrics, Lausanne University Hospital, Chemin de Mont-Paisible 18, 1011 Lausanne, Switzerland.
| | - Hugues Henry
- Service of Clinical Chemistry, Lausanne University Hospital, Rue du Bugnon 46, 1011 Lausanne, Switzerland
| | - Julijana Ivanisevic
- Metabolomics Platform, Faculty of Biology and Medicine, University of Lausanne, Rue du Bugnon 19, 1005 Lausanne, Switzerland.
| | - Jessica Schmiesing
- Department of Biochemistry, University Medical Center Hamburg-Eppendorf, University Children's Hospital, Martinistrasse 52, 20246 Hamburg, Germany.
| | - Chris Mühlhausen
- Department of Biochemistry, University Medical Center Hamburg-Eppendorf, University Children's Hospital, Martinistrasse 52, 20246 Hamburg, Germany.
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital, Rue du Bugnon 46, 1011 Lausanne, Switzerland.
| | - Diana Ballhausen
- Pediatric Metabolic Disease Unit, Department of Pediatrics, Lausanne University Hospital, Chemin de Mont-Paisible 18, 1011 Lausanne, Switzerland.
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Remacle N, Forny P, Cudré-Cung HP, Gonzalez-Melo M, do Vale-Pereira S, Henry H, Teav T, Gallart-Ayala H, Braissant O, Baumgartner M, Ballhausen D. New in vitro model derived from brain-specific Mut-/- mice confirms cerebral ammonium accumulation in methylmalonic aciduria. Mol Genet Metab 2018; 124:266-277. [PMID: 29934063 DOI: 10.1016/j.ymgme.2018.06.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 06/14/2018] [Accepted: 06/14/2018] [Indexed: 12/21/2022]
Abstract
BACKGROUND Methylmalonic aciduria (MMAuria) is an inborn error of metabolism leading to neurological deterioration. In this study, we used 3D organotypic brain cell cultures derived from embryos of a brain-specific Mut-/- (brain KO) mouse to investigate mechanisms leading to brain damage. We challenged our in vitro model by a catabolic stress (temperature shift). RESULTS Typical metabolites for MMAuria as well as a massive NH4+ increase were found in the media of brain KO cultures. We investigated different pathways of intracerebral NH4+ production and found increased expression of glutaminase 2 and diminished expression of GDH1 in Mut-/- aggregates. While all brain cell types appeared affected in their morphological development in Mut-/- aggregates, the most pronounced effects were observed on astrocytes showing swollen fibers and cell bodies. Inhibited axonal elongation and delayed myelination of oligodendrocytes were also noted. Most effects were even more pronounced after 48 h at 39 °C. Microglia activation and an increased apoptosis rate suggested degeneration of Mut-/- brain cells. NH4+ accumulation might be the trigger for all observed alterations. We also found a generalized increase of chemokine concentrations in Mut-/- culture media at an early developmental stage followed by a decrease at a later stage. CONCLUSION We proved for the first time that Mut-/- brain cells are indeed able to produce the characteristic metabolites of MMAuria. We confirmed significant NH4+ accumulation in culture media of Mut-/- aggregates, suggesting that intracellular NH4+ concentrations might even be higher, gave first clues on the mechanisms leading to NH4+ accumulation in Mut-/- brain cells, and showed the involvement of neuroinflammatory processes in the neuropathophysiology of MMAuria.
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Affiliation(s)
- Noémie Remacle
- Center of Molecular Diseases, Lausanne University Hospital, Lausanne 1011, Switzerland.
| | - Patrick Forny
- Division of Metabolism, University Children's Hospital Zurich, Zurich 8032, Switzerland
| | - Hong-Phuc Cudré-Cung
- Center of Molecular Diseases, Lausanne University Hospital, Lausanne 1011, Switzerland.
| | - Mary Gonzalez-Melo
- Center of Molecular Diseases, Lausanne University Hospital, Lausanne 1011, Switzerland.
| | - Sónia do Vale-Pereira
- Center of Molecular Diseases, Lausanne University Hospital, Lausanne 1011, Switzerland
| | - Hugues Henry
- Service of Clinical Chemistry, Lausanne University Hospital, Lausanne 1011, Switzerland.
| | - Tony Teav
- Metabolomics Unit, Faculty of Biology and Medicine, University of Lausanne, Lausanne 1011, Switzerland.
| | - Hector Gallart-Ayala
- Metabolomics Unit, Faculty of Biology and Medicine, University of Lausanne, Lausanne 1011, Switzerland.
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital, Lausanne 1011, Switzerland.
| | - Matthias Baumgartner
- Division of Metabolism, University Children's Hospital Zurich, Zurich 8032, Switzerland.
| | - Diana Ballhausen
- Center of Molecular Diseases, Lausanne University Hospital, Lausanne 1011, Switzerland.
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Debray FG, Damjanovic K, Rosset R, Mittaz-Crettol L, Roux C, Braissant O, Barbey F, Bonafé L, De Bandt JP, Tappy L, Paquot N, Tran C. Are heterozygous carriers for hereditary fructose intolerance predisposed to metabolic disturbances when exposed to fructose? Am J Clin Nutr 2018; 108:292-299. [PMID: 29955837 DOI: 10.1093/ajcn/nqy092] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 04/10/2018] [Indexed: 02/07/2023] Open
Abstract
Background High fructose intake causes hepatic insulin resistance and increases postprandial blood glucose, lactate, triglyceride, and uric acid concentrations. Uric acid may contribute to insulin resistance and dyslipidemia in the general population. In patients with hereditary fructose intolerance, fructose consumption is associated with acute hypoglycemia, renal tubular acidosis, and hyperuricemia. Objective We investigated whether asymptomatic carriers for hereditary fructose intolerance (HFI) would have a higher sensitivity to adverse effects of fructose than would the general population. Design Eight subjects heterozygous for HFI (hHFI; 4 men, 4 women) and 8 control subjects received a low-fructose diet for 7 d and on the eighth day ingested a test meal, calculated to provide 25% of the basal energy requirement, containing 13C-labeled fructose (0.35 g/kg), glucose (0.35 g/kg), protein (0.21 g/kg), and lipid (0.22 g/kg). Glucose rate of appearance (GRa, calculated with [6,6-2H2]glucose), fructose, net carbohydrate, and lipid oxidation, and plasma triglyceride, uric acid, and lactate concentrations were monitored over 6 h postprandially. Results Postprandial GRa, fructose, net carbohydrate, and lipid oxidation, and plasma lactate and triglyceride concentrations were not significantly different between the 2 groups. Postprandial plasma uric acid increased by 7.2% compared with fasting values in hHFI subjects (P < 0.01), but not in control subjects (-1.1%, ns). Conclusions Heterozygous carriers of hereditary fructose intolerance had no significant alteration of postprandial fructose metabolism compared with control subjects. They did, however, show a postprandial increase in plasma uric acid concentration that was not observed in control subjects in responses to ingestion of a modest amount of fructose. This trial was registered at the US Clinical Trials Registry as NCT02979106.
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Affiliation(s)
- François-Guillaume Debray
- Metabolic Unit, Department of Medical Genetics, CHU & University of Liège, Member of the European Reference Network for Rare Hereditary Metabolic Disorders (METABERN), Belgium
| | - Katarina Damjanovic
- Faculty of Biology and Medicine, Department of Physiology, University of Lausanne, Lausanne, Switzerland
| | - Robin Rosset
- Faculty of Biology and Medicine, Department of Physiology, University of Lausanne, Lausanne, Switzerland
| | | | - Clothilde Roux
- Service of Clinical Chemistry, Lausanne University Hospital, Lausanne, Switzerland
| | - Olivier Braissant
- Service of Clinical Chemistry, Lausanne University Hospital, Lausanne, Switzerland
| | | | - Luisa Bonafé
- Center for Molecular Diseases, Division of Genetic Medicine
| | - Jean-Pascal De Bandt
- EA 4466, Nutrition Biology Laboratory, Faculty of Pharmacy, Paris Descartes University, Sorbonne Paris Cité, Paris, France
| | - Luc Tappy
- Faculty of Biology and Medicine, Department of Physiology, University of Lausanne, Lausanne, Switzerland
| | - Nicolas Paquot
- Division of Diabetes, Nutrition and Metabolic Diseases, Department of Medicine CHU Sart-Tilman and GIGA I3, Immunometabolism and Nutrition Unit, University of Liège, Liège, Belgium
| | - Christel Tran
- Center for Molecular Diseases, Division of Genetic Medicine
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Pace A, Bourillot R, Bouton A, Vennin E, Braissant O, Dupraz C, Duteil T, Bundeleva I, Patrier P, Galaup S, Yokoyama Y, Franceschi M, Virgone A, Visscher PT. Formation of stromatolite lamina at the interface of oxygenic-anoxygenic photosynthesis. Geobiology 2018; 16:378-398. [PMID: 29573198 DOI: 10.1111/gbi.12281] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 02/13/2018] [Indexed: 06/08/2023]
Abstract
In modern stromatolites, mineralization results from a complex interplay between microbial metabolisms, the organic matrix, and environmental parameters. Here, we combined biogeochemical, mineralogical, and microscopic analyses with measurements of metabolic activity to characterize the mineralization processes and products in an emergent (<18 months) hypersaline microbial mat. While the nucleation of Mg silicates is ubiquitous in the mat, the initial formation of a Ca-Mg carbonate lamina depends on (i) the creation of a high-pH interface combined with a major change in properties of the exopolymeric substances at the interface of the oxygenic and anoxygenic photoautotrophic layers and (ii) the synergy between two major players of sulfur cycle, purple sulfur bacteria, and sulfate-reducing bacteria. The repetition of this process over time combined with upward growth of the mat is a possible pathway leading to the formation of a stromatolite.
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Affiliation(s)
- A Pace
- EA 4592, Géoressources & Environnement, Ensegid, Bordeaux INP, Pessac, France
- Université Bordeaux Montaigne, Pessac, France
| | - R Bourillot
- EA 4592, Géoressources & Environnement, Ensegid, Bordeaux INP, Pessac, France
| | - A Bouton
- Laboratoire Biogéosciences, UMR 6282 UBFC/CNRS, Université Bourgogne Franche-Comté, Dijon, France
- Total, CSTJF, Pau, France
| | - E Vennin
- Laboratoire Biogéosciences, UMR 6282 UBFC/CNRS, Université Bourgogne Franche-Comté, Dijon, France
| | - O Braissant
- Center for Biomechanics and Biocalorimetry, University of Basel, Basel, Switzerland
| | - C Dupraz
- Department of Geological Sciences, Stockholm University, Stockholm, Sweden
| | - T Duteil
- EA 4592, Géoressources & Environnement, Ensegid, Bordeaux INP, Pessac, France
| | - I Bundeleva
- Laboratoire Biogéosciences, UMR 6282 UBFC/CNRS, Université Bourgogne Franche-Comté, Dijon, France
| | - P Patrier
- UMR 7285 CNRS IC2MP, Université de Poitiers, Poitiers, France
| | - S Galaup
- EA 4592, Géoressources & Environnement, Ensegid, Bordeaux INP, Pessac, France
| | - Y Yokoyama
- Department of Earth and Planetary Sciences, Atmosphere and Ocean Research Institute, University of Tokyo, Chiba, Japan
| | - M Franceschi
- EA 4592, Géoressources & Environnement, Ensegid, Bordeaux INP, Pessac, France
| | | | - P T Visscher
- Department of Marine Sciences, University of Connecticut, Groton, CT, USA
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Bonkat G, Braissant O, Cai T, Köves B, Bjerklund Johansen TE, Pickard R, Veeratterapillay R. Non-molecular Methods to Detect Bacteriuria Prior to Urological Interventions: A Diagnostic Accuracy Systematic Review. Eur Urol Focus 2018; 3:535-537. [PMID: 29627196 DOI: 10.1016/j.euf.2018.03.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 02/19/2018] [Accepted: 03/05/2018] [Indexed: 11/17/2022]
Abstract
Urine culture still has to be considered as the gold standard to rule out bacteriuria and should, therefore, be obtained prior to invasive endoscopic or open urological procedures to minimize the risk of severe infectious complications.
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Affiliation(s)
- Gernot Bonkat
- alta uro AG, Merian Iselin Klinik, Center of Biomechanics & Calorimetry (COB), University Basel, Basel, Switzerland.
| | - Olivier Braissant
- alta uro AG, Merian Iselin Klinik, Center of Biomechanics & Calorimetry (COB), University Basel, Basel, Switzerland; Merian Iselin Klinik, Center of Biomechanics & Calorimetry (COB), University Basel, Basel, Switzerland
| | - Tomasso Cai
- Department of Urology, Santa Chiara, Reg. Hospital, Trento, Italy
| | - Bela Köves
- Department of Urology, South-Pest Teaching Hospital, Budapest, Hungary
| | | | - Robert Pickard
- Department of Urology, Newcastle University, Newcastle, UK
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43
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Gysin M, Braissant O, Gillingwater K, Brun R, Mäser P, Wenzler T. Isothermal microcalorimetry - A quantitative method to monitor Trypanosoma congolense growth and growth inhibition by trypanocidal drugs in real time. Int J Parasitol Drugs Drug Resist 2018; 8:159-164. [PMID: 29587237 PMCID: PMC6039311 DOI: 10.1016/j.ijpddr.2018.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 11/14/2017] [Revised: 02/14/2018] [Accepted: 03/13/2018] [Indexed: 11/18/2022]
Abstract
Trypanosoma congolense is a protozoan parasite that is transmitted by tsetse flies, causing African Animal Trypanosomiasis, also known as Nagana, in sub-Saharan Africa. Nagana is a fatal disease of livestock that causes severe economic losses. Two drugs are available, diminazene and isometamidium, yet successful treatment is jeopardized by drug resistant T. congolense. Isothermal microcalorimetry is a highly sensitive tool that can be used to study growth of the extracellular T. congolense parasites or to study parasite growth inhibition after the addition of antitrypanosomal drugs. Time of drug action and time to kill can be quantified in a simple way by real time heat flow measurements. We established a robust protocol for the microcalorimetric studies of T. congolense and developed mathematical computations in R to calculate different parameters related to growth and the kinetics of drug action. We demonstrate the feasibility and benefit of the method exemplary with the two standard drugs, diminazene aceturate and isometamidium chloride. The method and the mathematical approach can be translated to study other pathogenic or non-pathogenic cells if they are metabolically active and grow under axenic conditions. Isothermal microcalorimetry enables heat flow measurement of T. congolense in real-time. Heat flow measurements correlate with number of viable cells. Growth and drug-induced growth inhibition can be deducted from heat flow curves. Pharmacodynamic drug action parameters can be computed from heat flow curves. This method is a valuable tool in the drug discovery process against T. congolense.
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Affiliation(s)
- M Gysin
- Medical Parasitology & Infection Biology, Swiss Tropical and Public Health Institute, Socinstrasse 57, 4051, Basel, Switzerland; University of Basel, Petersplatz 1, 4001, Basel, Switzerland
| | - O Braissant
- Center of Biomechanics & Biocalorimetry, University of Basel, Gewerbestrasse 14, Allschwil, 4123, Switzerland
| | - K Gillingwater
- Medical Parasitology & Infection Biology, Swiss Tropical and Public Health Institute, Socinstrasse 57, 4051, Basel, Switzerland; University of Basel, Petersplatz 1, 4001, Basel, Switzerland
| | - R Brun
- Medical Parasitology & Infection Biology, Swiss Tropical and Public Health Institute, Socinstrasse 57, 4051, Basel, Switzerland; University of Basel, Petersplatz 1, 4001, Basel, Switzerland
| | - P Mäser
- Medical Parasitology & Infection Biology, Swiss Tropical and Public Health Institute, Socinstrasse 57, 4051, Basel, Switzerland; University of Basel, Petersplatz 1, 4001, Basel, Switzerland
| | - T Wenzler
- Medical Parasitology & Infection Biology, Swiss Tropical and Public Health Institute, Socinstrasse 57, 4051, Basel, Switzerland; University of Basel, Petersplatz 1, 4001, Basel, Switzerland.
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Bravo D, Pardo‐Díaz S, Benavides‐Erazo J, Rengifo‐Estrada G, Braissant O, Leon‐Moreno C. Cadmium and cadmium‐tolerant soil bacteria in cacao crops from northeastern Colombia. J Appl Microbiol 2018; 124:1175-1194. [DOI: 10.1111/jam.13698] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 12/14/2017] [Accepted: 01/09/2018] [Indexed: 11/30/2022]
Affiliation(s)
- D. Bravo
- Laboratory of Soil Microbiology and Calorimetry Corporación Colombiana de Investigación Agropecuaria – Corpoica Centro de Investigación Tibaitatá – kilómetro 14 vía Mosquera‐Bogotá Cundinamarca Colombia
| | - S. Pardo‐Díaz
- Laboratory of Soil Microbiology and Calorimetry Corporación Colombiana de Investigación Agropecuaria – Corpoica Centro de Investigación Tibaitatá – kilómetro 14 vía Mosquera‐Bogotá Cundinamarca Colombia
| | | | - G. Rengifo‐Estrada
- Corporación Colombiana de Investigación Agropecuaria – Corpoica, Centro de Investigación La Suiza – kilómetro 32 vía al mar vereda Galápagos Rionegro Santander Colombia
| | - O. Braissant
- Center of Biomechanics & Calorimetry Basel (COB) University of Basel Basel Switzerland
| | - C. Leon‐Moreno
- Corporación Colombiana de Investigación Agropecuaria – Corpoica, Centro de Investigación La Suiza – kilómetro 32 vía al mar vereda Galápagos Rionegro Santander Colombia
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von Ah U, Shani N, Chollet M, Solokhina A, Braissant O. Measuring antibiotic resistance in mixed cultures: Isothermal microcalorimetry as a novel analytical tool. Int Dairy J 2018. [DOI: 10.1016/j.idairyj.2017.09.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Astasov-Frauenhoffer M, Varenganayil MM, Decho AW, Waltimo T, Braissant O. Exopolysaccharides regulate calcium flow in cariogenic biofilms. PLoS One 2017; 12:e0186256. [PMID: 29023506 PMCID: PMC5638444 DOI: 10.1371/journal.pone.0186256] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Accepted: 09/28/2017] [Indexed: 11/18/2022] Open
Abstract
Caries-associated biofilms induce loss of calcium from tooth surfaces in the presence of dietary carbohydrates. Exopolysaccharides (EPS) provide a matrix scaffold and an abundance of primary binding sites within biofilms. The role of EPS in binding calcium in cariogenic biofilms is only partially understood. Thus, the aim of the present study is to investigate the relationship between the calcium dissolution rates and calcium tolerance of caries-associated bacteria and yeast as well as to examine the properties of EPS to quantify its binding affinity for dissolved calcium. Calcium dissolution was measured by dissolution zones on Pikovskaya's agar. Calcium tolerance was assessed by isothermal microcalorimetry (IMC) by adding CaCl2 to the bacterial cultures. Acid-base titration and Fourier transform infrared (FTIR) spectroscopy were used to identify possible functional groups responsible for calcium binding, which was assessed by isothermal titration calorimetry (ITC). Lactobacillus spp. and mutans streptococci demonstrated calcium dissolution in the presence of different carbohydrates. All strains that demonstrated high dissolution rates also revealed higher rates of calcium tolerance by IMC. In addition, acidic functional groups were predominantly identified as possible binding sites for calcium ions by acid-base titration and FTIR. Finally, ITC revealed EPS to have a higher binding affinity for calcium compared, for example, to lactic acid. In conclusion, this study illustrates the role of EPS in terms of the calcium tolerance of cariogenic microbiota by determining the ability of EPS to control free calcium concentrations within the biofilms as a self-regulating mode of action in the pathogenesis of dental caries.
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Affiliation(s)
- Monika Astasov-Frauenhoffer
- Department of Preventive Dentistry and Oral Microbiology, University Center for Dental Medicine, University of Basel, Basel, Switzerland
- * E-mail:
| | - Muth M. Varenganayil
- Department of Preventive Dentistry and Oral Microbiology, University Center for Dental Medicine, University of Basel, Basel, Switzerland
| | - Alan W. Decho
- Department of Environmental Health Sciences, Arnold School of Public Health, Columbia, South Carolina, United States
| | - Tuomas Waltimo
- Department of Preventive Dentistry and Oral Microbiology, University Center for Dental Medicine, University of Basel, Basel, Switzerland
| | - Olivier Braissant
- Center of Biomechanics & Biocalorimetry, c/o Department Biomedical Engineering (DBE), University of Basel, Allschwil, Switzerland
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Solokhina A, Brückner D, Bonkat G, Braissant O. Metabolic activity of mature biofilms of Mycobacterium tuberculosis and other non-tuberculous mycobacteria. Sci Rep 2017; 7:9225. [PMID: 28835629 PMCID: PMC5569076 DOI: 10.1038/s41598-017-10019-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 08/02/2017] [Indexed: 11/08/2022] Open
Abstract
Mycobacteria are classified into two groups, fast- and slow-growing. Often, fast-growing mycobacteria are assumed to have a higher metabolic activity than their slower counterparts, but in mature biofilms this assumption might not be correct. Indeed, when measuring the metabolic activity of mycobacterial biofilms with two independent non-invasive techniques (isothermal microcalorimetry and tunable diode laser absorption spectrometry), mature biofilms of slow- and fast-growing species appeared more alike than expected. Metabolic heat production rate was 2298 ± 181 µW for M. smegmatis and 792 ± 81 µW for M. phlei, while M. tuberculosis and M. bovis metabolic heat production rates were between these values. These small differences were further confirmed by similar oxygen consumption rates (3.3 ± 0.2 nMole/s and 1.7 ± 0.3 nMole/s for M. smegmatis and M. tuberculosis, respectively). These data suggest that the metabolic potential of slow-growing mycobacterial biofilms has been underestimated, particularly for pathogenic species.
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Affiliation(s)
- Anna Solokhina
- Center of Biomechanics & Biocalorimetry, University Basel, Gewerbestr. 14, CH-4123, Allschwil, Switzerland
| | - David Brückner
- Center of Biomechanics & Biocalorimetry, University Basel, Gewerbestr. 14, CH-4123, Allschwil, Switzerland
- F. Hoffmann - La Roche, Ltd., Sterile Drug Product Manufacturing, Wurmisweg, CH-4303, Kaiseraugst, Switzerland
| | - Gernot Bonkat
- Alta Uro AG, Centralbahnplatz 6, CH-4051, Basel, Switzerland
| | - Olivier Braissant
- Center of Biomechanics & Biocalorimetry, University Basel, Gewerbestr. 14, CH-4123, Allschwil, Switzerland.
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Brueckner D, Krähenbühl S, Zuber U, Bonkat G, Braissant O. An alternative sterility assessment for parenteral drug products using isothermal microcalorimetry. J Appl Microbiol 2017; 123:773-779. [PMID: 28776899 DOI: 10.1111/jam.13520] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/19/2017] [Accepted: 06/19/2017] [Indexed: 11/29/2022]
Abstract
AIMS Production and release of injectable drug solutions are highly regulated since the administration of injectables bypasses natural body barriers. The sterility test is the last opportunity of product quality assessment. However, sterility is currently assessed by visual inspection (VI) that is time consuming and somewhat subjective. Therefore, we assessed isothermal microcalorimetry (IMC) as a replacement for the VI of the filtration based state-of-the-art sterility control. METHODS AND RESULTS We used ATCC strains and house isolates to artificially contaminate frequently produced monoclonal antibodies (Avastin, Mabthera, Herceptin). After filtration, growth was assessed with IMC. Growth of all micro-organisms was reliably and reproducibly detected 4 days after inoculation, which was significantly faster than with VI. CONCLUSIONS The reliability and the sensitivity of IMC have a large potential to improve sterility controls. Further evaluation of this alternative method is therefore highly recommended. SIGNIFICANCE AND IMPACT OF THE STUDY Drug safety is of great concern for public health. Faster and safer drug production could be achieved using the technique described here. All the tests were performed with real manufactured drugs and complied with pharmaceutical standards. This suggests that drug sterility testing can be improved with potentially increased safety and cost reduction.
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Affiliation(s)
- D Brueckner
- Center of Biomechanics and Biocalorimetry, University of Basel, Allschwil, Switzerland.,Sterile Drug Product Manufacturing, F. Hoffmann - La Roche Ltd, Kaiseraugst, Switzerland
| | - S Krähenbühl
- Clinical Pharmacology & Toxicology, Universitätsspital Basel, Basel, Switzerland
| | - U Zuber
- Sterile Drug Product Manufacturing, F. Hoffmann - La Roche Ltd, Kaiseraugst, Switzerland
| | | | - O Braissant
- Center of Biomechanics and Biocalorimetry, University of Basel, Allschwil, Switzerland.,Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland
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Lanz B, Rackayova V, Braissant O, Cudalbu C. MRS studies of neuroenergetics and glutamate/glutamine exchange in rats: Extensions to hyperammonemic models. Anal Biochem 2017; 529:245-269. [DOI: 10.1016/j.ab.2016.11.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 11/16/2016] [Accepted: 11/30/2016] [Indexed: 01/27/2023]
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Brueckner D, Roesti D, Zuber U, Sacher M, Duncan D, Krähenbühl S, Braissant O. Tunable diode laser absorption spectroscopy as method of choice for non-invasive and automated detection of microbial growth in media fills. Talanta 2017; 167:21-29. [DOI: 10.1016/j.talanta.2017.01.088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/27/2017] [Accepted: 01/30/2017] [Indexed: 10/20/2022]
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