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Prophylactic Inhibition of Colonization by Streptococcus pneumoniae with the Secondary Bile Acid Metabolite Deoxycholic Acid. Infect Immun 2021; 89:e0046321. [PMID: 34543118 DOI: 10.1128/iai.00463-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Streptococcus pneumoniae colonizes the nasopharynx of children and the elderly but also kills millions worldwide yearly. The secondary bile acid metabolite deoxycholic acid (DoC) affects the viability of human pathogens but also plays multiple roles in host physiology. We assessed in vitro the antimicrobial activity of DoC and investigated its potential to eradicate S. pneumoniae colonization using a model of human nasopharyngeal colonization and an in vivo mouse model of colonization. At a physiological concentration, DoC (0.5 mg/ml; 1.27 mM) killed all tested S. pneumoniae strains (n = 48) 2 h postinoculation. The model of nasopharyngeal colonization showed that DoC eradicated colonization by S. pneumoniae strains as soon as 10 min postexposure. The mechanism of action did not involve activation of autolysis, since the autolysis-defective double mutants ΔlytAΔlytC and ΔspxBΔlctO were as susceptible to DoC as was the wild type (WT). Oral streptococcal species (n = 20), however, were not susceptible to DoC (0.5 mg/ml). Unlike trimethoprim, whose spontaneous resistance frequency (srF) for TIGR4 or EF3030 was ≥1 × 10-9, no spontaneous resistance was observed with DoC (srF, ≥1 × 10-12). Finally, the efficacy of DoC to eradicate S. pneumoniae colonization was assessed in vivo using a topical route via intranasal (i.n.) administration and as a prophylactic treatment. Mice challenged with S. pneumoniae EF3030 carried a median of 4.05 × 105 CFU/ml 4 days postinoculation compared to 6.67 × 104 CFU/ml for mice treated with DoC. Mice in the prophylactic group had an ∼99% reduction of the pneumococcal density (median, 2.61 × 103 CFU/ml). Thus, DoC, an endogenous human bile salt, has therapeutic potential against S. pneumoniae.
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In Vitro Simulation of the Environment in the Upper Gastrointestinal Lumen After Drug Administration in the Fed State Using the TIM-1 System and Comparison With Luminal Data in Adults. J Pharm Sci 2021; 111:197-205. [PMID: 34673096 DOI: 10.1016/j.xphs.2021.10.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 10/11/2021] [Accepted: 10/11/2021] [Indexed: 10/20/2022]
Abstract
We evaluated the environment in TIM-1 luminal compartments using paracetamol and danazol solutions and suspensions and the fed state configuration. Data were compared with recently published data in healthy adults. TIM-1 experiments were performed with a 3-fold downscale. Volumes of secretions in gastric and duodenal compartments adequately reflected the luminal data in adults up to 3 h post drug dosing. pH values in duodenal and jejunal compartments adequately reflected average pH values in adults. In gastric compartment pH values where initially higher than average values in adults and reached baseline levels earlier than in adults. The environment in the TIM-1 gastric compartment and jejunal compartment adequately reflected the average total paracetamol and danazol amounts per volume of contents in the adult stomach and upper small intestine, respectively. Total bile acids concentrations in the micellar phase of contents in duodenal and jejunal compartments overestimated micellar concentrations in the upper small intestine of adults. Adjustments in gastric emptying/acid secretion rates and bile acids identities in the duodenal and jejunal compartments, and application of dynamic bile acids secretion rates are expected to further improve the relevance of luminal conditions in TIM-1 compartments with those in adults.
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Jereb R, Opara J, Bajc A, Petek B. Evaluating the Impact of Physiological Properties of the Gastrointestinal Tract On Drug In Vivo Performance Using Physiologically Based Biopharmaceutics Modeling and Virtual Clinical Trials. J Pharm Sci 2021; 110:3069-3081. [PMID: 33878322 DOI: 10.1016/j.xphs.2021.04.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 04/12/2021] [Accepted: 04/12/2021] [Indexed: 12/13/2022]
Abstract
The physiological properties of the gastrointestinal tract, such as pH, fluid volume, bile salt concentration, and gastrointestinal transit time, are highly variable in vivo. These properties can affect the dissolution and absorption of a drug, depending on its properties and formulation. The effect of gastrointestinal physiology on the bioperformance of a drug was studied in silico for a delayed-release pantoprazole tablet and an immediate-release dolutegravir tablet. Physiologically based absorption models were developed and virtual clinical trials were performed. Reasons for the variability in drug bioperformance between subjects were investigated, taking into account differences in gastrointestinal tract characteristics, pharmacokinetic parameters, and additional parameters (e.g., permeability). Default software parameters describing gastrointestinal physiology in the fasted and fed states, and variation in these parameters, were altered to match variability in these parameters reported in vivo. The altered model physiologies better described the variability of gastrointestinal conditions, and therefore the results of virtual trials using these physiologies are likely to be more relevant in vivo. With such altered gastrointestinal physiologies used to develop models, it is possible to obtain additional knowledge and improve the understanding of subject-formulation interactions.
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Affiliation(s)
- Rebeka Jereb
- University of Ljubljana, Faculty of Pharmacy, Aškerčeva cesta 7, 1000 Ljubljana, Slovenia; Lek Pharmaceuticals d.d., a Sandoz Company, Verovškova ulica 57, 1526 Ljubljana, Slovenia.
| | - Jerneja Opara
- Lek Pharmaceuticals d.d., a Sandoz Company, Verovškova ulica 57, 1526 Ljubljana, Slovenia
| | - Aleksander Bajc
- Lek Pharmaceuticals d.d., a Sandoz Company, Verovškova ulica 57, 1526 Ljubljana, Slovenia
| | - Boštjan Petek
- Lek Pharmaceuticals d.d., a Sandoz Company, Verovškova ulica 57, 1526 Ljubljana, Slovenia
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Effinger A, McAllister M, Tomaszewska I, O'Driscoll CM, Taylor M, Gomersall S, Heaton J, Smith KL, Sarcevica I, Young SL, Fotaki N. Investigating the Impact of Crohn's Disease on the Bioaccessibility of a Lipid-Based Formulation with an In Vitro Dynamic Gastrointestinal Model. Mol Pharm 2021; 18:1530-1543. [PMID: 33656882 DOI: 10.1021/acs.molpharmaceut.0c00807] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aim of the study was to investigate the impact of Crohn's disease (CD) on the performance of a lipid-based formulation of ciprofloxacin in a complex gastrointestinal simulator (TIM-1, TNO) and to compare the luminal environment in terms of bile salt and lipid composition in CD and healthy conditions. CD conditions were simulated in the TIM-1 system with a reduced concentration of porcine pancreatin and porcine bile. The bioaccessibility of ciprofloxacin was similar in simulated CD and healthy conditions considering its extent as well as its time course in the jejunum and ileum filtrate. Differences were observed in terms of the luminal concentration of triglycerides, monoglycerides, and fatty acids in the different TIM-1 compartments, indicating a reduction and delay in the lipolysis of formulation excipients in CD. The quantitative analysis of bile salts revealed higher concentrations for healthy conditions (standard TIM-1 fasted-state protocol) in the duodenum and jejunum TIM-1 compartments compared to published data in human intestinal fluids of healthy subjects. The reduced concentrations of bile salts in simulated CD conditions correspond to the levels observed in human intestinal fluids of healthy subjects in the fasted state.A lipidomics approach with ultra performance liquid chromatography (UPLC)/mass spectrometry (MS) has proven to be a time-efficient method to semiquantitatively analyze differences in fatty acid and bile salt levels between healthy and CD conditions. The dynamic luminal environment in CD and healthy conditions after administration of a lipid-based formulation can be simulated using the TIM-1 system. For ciprofloxacin, an altered luminal lipid composition had no impact on its performance indicating a low risk of altered performance in CD patients.
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Affiliation(s)
- Angela Effinger
- Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | | | | | - Caitriona M O'Driscoll
- School of Pharmacy, University College Cork, Cavanagh Pharmacy Building, Cork T12 YT20, Ireland
| | - Mark Taylor
- Pfizer Analytical Research and Development, Sandwich CT13 9NJ, U.K
| | - Steve Gomersall
- Pfizer Analytical Research and Development, Sandwich CT13 9NJ, U.K
| | - James Heaton
- Pfizer Analytical Research and Development, Sandwich CT13 9NJ, U.K
| | - Kieran L Smith
- Pfizer Analytical Research and Development, Sandwich CT13 9NJ, U.K
| | - Inese Sarcevica
- Pfizer Analytical Research and Development, Sandwich CT13 9NJ, U.K
| | - Sam L Young
- Pfizer Drug Product Design, Sandwich CT13 9NJ, U.K
| | - Nikoletta Fotaki
- Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath BA2 7AY, U.K
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Pentafragka C, Vertzoni M, Dressman J, Symillides M, Goumas K, Reppas C. Characteristics of contents in the upper gastrointestinal lumen after a standard high-calorie high-fat meal and implications for the in vitro drug product performance testing conditions. Eur J Pharm Sci 2020; 155:105535. [DOI: 10.1016/j.ejps.2020.105535] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/27/2020] [Accepted: 08/28/2020] [Indexed: 12/30/2022]
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Pitsch J, Weghuber J. Hydrophilic Interaction Chromatography Coupled with Charged Aerosol Detection for Simultaneous Quantitation of Carbohydrates, Polyols and Ions in Food and Beverages. Molecules 2019; 24:molecules24234333. [PMID: 31783530 PMCID: PMC6930467 DOI: 10.3390/molecules24234333] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 11/21/2019] [Accepted: 11/22/2019] [Indexed: 11/20/2022] Open
Abstract
Here, we report an accurate and versatile method for the simultaneous determination of 17 sugars (arabinose, erythrose, fructose, galactose, glucose, isomaltulose, lactose, lyxose, maltose, maltotriose, mannose, raffinose, rhamnose, ribose, sucrose, sorbose and xylose), seven polyols (erythritol, inositol, lactitol, maltitol, mannitol, sorbitol and xylitol), five ions (K+, Br−, Cl−, NO3− and SO42−) and the pseudosaccharide acarbose. For compound separation, hydrophilic interaction chromatography (HILIC) coupled to a corona charged aerosol detector (CAD) was used. The method was validated for linearity, precision, reproducibility, retention factor and optimal injection volume. Standards were measured in the range of 1–1000 mg L−1 and showed good intraday and interday repeatability, as well as precision (relative standard deviation (RSD) < 5%). The LODs and LOQs for the 30 analytes were in the range of 0.032–2.675 mg L−1 and 0.107–8.918 mg L−1, respectively. This method exhibited correlation coefficients of at least R2 > 0.97 for all analytes. The method was tested in 24 food and beverage samples to validate the separation efficiency and sensitivity in natural food matrices and to show the practicability of its use for routine food analysis.
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Affiliation(s)
- Johannes Pitsch
- FFoQSI-Austrian Competence Centre for Feed and Food Quality, Safety & Innovation, Head Office, FFoQSI GmbH, Technopark 1C, 3430 Tulln, Austria;
- Center of Excellence—Food Technology and Nutrition, University of Applied Sciences Upper Austria, 4600 Wels, Austria
| | - Julian Weghuber
- FFoQSI-Austrian Competence Centre for Feed and Food Quality, Safety & Innovation, Head Office, FFoQSI GmbH, Technopark 1C, 3430 Tulln, Austria;
- Center of Excellence—Food Technology and Nutrition, University of Applied Sciences Upper Austria, 4600 Wels, Austria
- Correspondence: ; Tel.: +43-50804-44403
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Roussel C, Cordonnier C, Galia W, Le Goff O, Thévenot J, Chalancon S, Alric M, Thevenot-Sergentet D, Leriche F, Van de Wiele T, Livrelli V, Blanquet-Diot S. Increased EHEC survival and virulence gene expression indicate an enhanced pathogenicity upon simulated pediatric gastrointestinal conditions. Pediatr Res 2016; 80:734-743. [PMID: 27429202 DOI: 10.1038/pr.2016.144] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 05/15/2016] [Indexed: 11/09/2022]
Abstract
BACKGROUND Enterohemorrhagic Escherichia coli (EHEC) are major foodborne pathogens that constitute a serious public health threat, mainly in young children. Shiga toxins (Stx) are the main virulence determinants of EHEC pathogenesis but adhesins like intimin (eae) and Long polar fimbriae (Lpf) also contribute to infection. The TNO GastroIntestinal Model (TIM) was used for a comparative study of EHEC O157:H7 survival and virulence under adult and child digestive conditions. METHODS Survival kinetics in the in vitro digestive tract were determined by plating while bacterial viability was assessed by flow cytometry analysis. Expression of stx, eae, and lpf genes was followed by reverse transcriptase-quantitative PCR (RT-qPCR) and Stx production was measured by ELISA (enzyme-linked immunosorbent assay). RESULTS Upon gastrointestinal passage, a higher amount of viable cells was found in the simulated ileal effluents of children compared to that of adults (with 34 and 6% of viable cells, respectively). Expression levels of virulence genes were up to 125-fold higher in children. Stx was detected only in child ileal effluents. CONCLUSION Differences in digestive physicochemical parameters may partially explain why children are more susceptible to EHEC infection than adults. Such data are essential for a full understanding of EHEC pathogenesis and would help in designing novel therapeutic approaches.
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Affiliation(s)
- Charlène Roussel
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France.,CMet, Center for Microbial Ecology and Technology, Ghent University, Ghent, Belgium
| | - Charlotte Cordonnier
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France.,M2iSH, Microbes, Intestin, Inflammation et Susceptibilité de l'Hôte UMR INSERM/Université d'Auvergne, Université d'Auvergne, Clermont-Ferrand, France
| | - Wessam Galia
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France.,UMR 5557 Ecologie Microbienne, Research Group on Bacterial Opportunistic Pathogens and Environment, CNRS, VetAgro Sup and Université de Lyon, Lyon, France.,Unité CALYTISS, VetAgro Sup, Lempdes, France
| | - Olivier Le Goff
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France
| | - Jonathan Thévenot
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France.,M2iSH, Microbes, Intestin, Inflammation et Susceptibilité de l'Hôte UMR INSERM/Université d'Auvergne, Université d'Auvergne, Clermont-Ferrand, France
| | - Sandrine Chalancon
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France
| | - Monique Alric
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France
| | - Delphine Thevenot-Sergentet
- UMR 5557 Ecologie Microbienne, Research Group on Bacterial Opportunistic Pathogens and Environment, CNRS, VetAgro Sup and Université de Lyon, Lyon, France.,Laboratoire d'Etude des Microorganismes Alimentaires Pathogènes, French National Reference Laboratory for Escherichia coli including Shiga Toxin-Producing E. coli, VetAgro Sup, Université de Lyon, Marcy l'Etoile, France
| | | | - Tom Van de Wiele
- CMet, Center for Microbial Ecology and Technology, Ghent University, Ghent, Belgium
| | - Valérie Livrelli
- M2iSH, Microbes, Intestin, Inflammation et Susceptibilité de l'Hôte UMR INSERM/Université d'Auvergne, Université d'Auvergne, Clermont-Ferrand, France.,Service de Bactériologie, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - Stéphanie Blanquet-Diot
- EA 4678 CIDAM, Conception Ingénierie et Développement de l'Aliment et du Médicament, Université d'Auvergne, Clermont-Ferrand, France
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Characteristics of the Human Upper Gastrointestinal Contents in the Fasted State Under Hypo- and A-chlorhydric Gastric Conditions Under Conditions of Typical Drug – Drug Interaction Studies. Pharm Res 2016; 33:1399-412. [DOI: 10.1007/s11095-016-1882-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 02/16/2016] [Indexed: 01/12/2023]
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Guerra A, Denis S, le Goff O, Sicardi V, François O, Yao AF, Garrait G, Manzi AP, Beyssac E, Alric M, Blanquet-Diot S. Development and validation of a new dynamic computer-controlled model of the human stomach and small intestine. Biotechnol Bioeng 2015; 113:1325-35. [DOI: 10.1002/bit.25890] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 11/09/2015] [Accepted: 11/15/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Aurélie Guerra
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | - Sylvain Denis
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | - Olivier le Goff
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | - Vincent Sicardi
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | | | - Anne-Françoise Yao
- UMR 6620 Laboratoire de Mathématiques; Clermont Université; Université Blaise Pascal; Clermont-Ferrand France
| | - Ghislain Garrait
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | - Aimé Pacifique Manzi
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | - Eric Beyssac
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | - Monique Alric
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
| | - Stéphanie Blanquet-Diot
- EA 4678 Conception; Ingénierie et Développement de l'Aliment et du Médicament Clermont Université; Université d'Auvergne; Centre de Recherche en Nutrition Humaine Auvergne; Faculté de Pharmacie; 28 Place H. Dunant F-63001 Clermont-Ferrand France
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Cordonnier C, Thévenot J, Etienne-Mesmin L, Denis S, Alric M, Livrelli V, Blanquet-Diot S. Dynamic In Vitro Models of the Human Gastrointestinal Tract as Relevant Tools to Assess the Survival of Probiotic Strains and Their Interactions with Gut Microbiota. Microorganisms 2015; 3:725-45. [PMID: 27682114 PMCID: PMC5023271 DOI: 10.3390/microorganisms3040725] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 06/08/2015] [Accepted: 09/11/2015] [Indexed: 02/07/2023] Open
Abstract
The beneficial effects of probiotics are conditioned by their survival during passage through the human gastrointestinal tract and their ability to favorably influence gut microbiota. The main objective of this study was to use dynamic in vitro models of the human digestive tract to investigate the effect of fasted or fed state on the survival kinetics of the new probiotic Saccharomyces cerevisiae strain CNCM I-3856 and to assess its influence on intestinal microbiota composition and activity. The probiotic yeast showed a high survival rate in the upper gastrointestinal tract whatever the route of admistration, i.e., within a glass of water or a Western-type meal. S. cerevisiae CNCM I-3856 was more sensitive to colonic conditions, as the strain was not able to colonize within the bioreactor despite a twice daily administration. The main bacterial populations of the gut microbiota, as well as the production of short chain fatty acids were not influenced by the probiotic treatment. However, the effect of the probiotic on the gut microbiota was found to be individual dependent. This study shows that dynamic in vitro models can be advantageously used to provide useful insight into the behavior of probiotic strains in the human digestive environment.
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Affiliation(s)
- Charlotte Cordonnier
- Accueil Conception, Ingénierie et Développement de l'Aliment et du Médicament (EA 4678 CIDAM), Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, Centre Biomédical de Recherche et de Valorisation (CBRV) 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
- Microbes, Intestin, Inflammation et Susceptibilité de l'Hôte (M2iSH), Unité Mixte de Recherche Institut National de la Santé Et de la Recherche Médicale (UMR INSERM) / Université d'Auvergne U1071 Unité Sous Contrat - Institut National de Recherche Agronomique (USC-INRA) 2018, Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, CBRV 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
| | - Jonathan Thévenot
- Accueil Conception, Ingénierie et Développement de l'Aliment et du Médicament (EA 4678 CIDAM), Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, Centre Biomédical de Recherche et de Valorisation (CBRV) 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
- Microbes, Intestin, Inflammation et Susceptibilité de l'Hôte (M2iSH), Unité Mixte de Recherche Institut National de la Santé Et de la Recherche Médicale (UMR INSERM) / Université d'Auvergne U1071 Unité Sous Contrat - Institut National de Recherche Agronomique (USC-INRA) 2018, Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, CBRV 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
| | - Lucie Etienne-Mesmin
- Accueil Conception, Ingénierie et Développement de l'Aliment et du Médicament (EA 4678 CIDAM), Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, Centre Biomédical de Recherche et de Valorisation (CBRV) 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
- Microbes, Intestin, Inflammation et Susceptibilité de l'Hôte (M2iSH), Unité Mixte de Recherche Institut National de la Santé Et de la Recherche Médicale (UMR INSERM) / Université d'Auvergne U1071 Unité Sous Contrat - Institut National de Recherche Agronomique (USC-INRA) 2018, Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, CBRV 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
| | - Sylvain Denis
- Accueil Conception, Ingénierie et Développement de l'Aliment et du Médicament (EA 4678 CIDAM), Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, Centre Biomédical de Recherche et de Valorisation (CBRV) 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
| | - Monique Alric
- Accueil Conception, Ingénierie et Développement de l'Aliment et du Médicament (EA 4678 CIDAM), Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, Centre Biomédical de Recherche et de Valorisation (CBRV) 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
| | - Valérie Livrelli
- Microbes, Intestin, Inflammation et Susceptibilité de l'Hôte (M2iSH), Unité Mixte de Recherche Institut National de la Santé Et de la Recherche Médicale (UMR INSERM) / Université d'Auvergne U1071 Unité Sous Contrat - Institut National de Recherche Agronomique (USC-INRA) 2018, Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, CBRV 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
- Service de Bactériologie, Centre Hospitalier Universitaire (CHU), Clermont-Ferrand, 58 rue Montalembert, 63000 Clermont-Ferrand, France.
| | - Stéphanie Blanquet-Diot
- Accueil Conception, Ingénierie et Développement de l'Aliment et du Médicament (EA 4678 CIDAM), Centre de Recherche en Nutrition Humaine Auvergne, Université d'Auvergne, Centre Biomédical de Recherche et de Valorisation (CBRV) 28 place Henri Dunant, 63000 Clermont-Ferrand, France.
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11
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Mathiassen JH, Nejrup RG, Frøkiaer H, Nilsson Å, Ohlsson L, Hellgren LI. Emulsifying triglycerides with dairy phospholipids instead of soy lecithin modulates gut lipase activity. EUR J LIPID SCI TECH 2015. [DOI: 10.1002/ejlt.201400505] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
| | | | - Hanne Frøkiaer
- Department of Veterinary Disease Biology; University of Copenhagen; Denmark
| | - Åke Nilsson
- Department of Clinical Science; Division of Medicine; Lund University Hospital; Sweden
| | - Lena Ohlsson
- Department of Clinical Science; Division of Medicine; Lund University Hospital; Sweden
| | - Lars I. Hellgren
- Department of Systems Biology; Technical University of Denmark; Denmark
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12
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Fuchs A, Dressman JB. Composition and physicochemical properties of fasted-state human duodenal and jejunal fluid: a critical evaluation of the available data. J Pharm Sci 2014; 103:3398-3411. [PMID: 25277073 DOI: 10.1002/jps.24183] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 07/27/2014] [Accepted: 09/02/2014] [Indexed: 11/05/2022]
Abstract
Various methods of sampling and analyzing intestinal fluids have been applied over the years. In this report, data that have been published to date about the composition of fasted-state human intestinal fluid (HIF) and its physicochemical properties are summarized and the influence of the methods used to generate the data is discussed. Key physiological parameters summarized include pH, buffer capacity, osmolarity, and ionic strength in both the fasted duodenum and jejunum. Furthermore, the bile salts and phospholipids in the fasted small intestine are addressed in terms of both qualitative and quantitative composition with respect to the different types and degrees of hydroxylation of bile salts. Taurocholate, glycocholate, and glycochenodeoxycholate were identified as the main bile salts. Lysolecithin was identified as the predominant phospholipid species in fasted HIF because of the enzymatic degradation of lecithin. Together with other intestinal surfactants, such as cholesterol and free fatty acids, the influence of bile acids and phospholipids on the surface tension of fasted HIF was evaluated. A good working knowledge of all the above-mentioned parameters is important to optimize the composition of biorelevant media, with a view to improving the prediction of in vivo dissolution and release performance of drugs and dosage forms.
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Affiliation(s)
- Alexander Fuchs
- Institute of Pharmaceutical Technology, Goethe University, Frankfurt am Main, Germany
| | - Jennifer B Dressman
- Institute of Pharmaceutical Technology, Goethe University, Frankfurt am Main, Germany.
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13
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Petrakis O, Vertzoni M, Angelou A, Kesisoglou F, Bentz K, Goumas K, Reppas C. Identification of key factors affecting the oral absorption of salts of lipophilic weak acids: a case example. J Pharm Pharmacol 2014; 67:56-67. [PMID: 25252222 DOI: 10.1111/jphp.12320] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 08/10/2014] [Indexed: 12/20/2022]
Abstract
Abstract
Objectives
Evaluate the ability of biorelevant media to adequately predict solubility in human gastrointestinal aspirates collected in the fasted state for the sodium salt of a highly dosed, Biopharmaceutics Classification System II (BCS II) compound with weakly acidic properties (L-870,810, pKa 7.3, HA (5-(1,1-dioxothiazinan-2-yl)-N-((4-fluorophenyl)methyl)-8-hydroxy-1,6-naphthyridine-7-carboxamide)). Identify key luminal processes that dictate the behaviour of sodium salt of HA (NaA), after single-dose administrations of high (relatively to solubility limit) doses corresponding to 400 and 800 mg of HA in the fasted state.
Methods
Aspirates from stomach and upper small intestine were collected from eight healthy fasted adults, after administration of 240 ml of water. Solubilities of NaA and HA were measured in aspirated samples and biorelevant media. Dissolution experiments of NaA granules were performed in biorelevant media. Prediction of oral pharmacokinetics was evaluated in silico using Stella software.
Key findings
Equilibrium solubility of NaA in fluids aspirated from the upper gastrointestinal tract is more transient than of HA. Solubility in upper gastrointestinal lumen was adequately estimated by data in biorelevant media. Supersaturation, followed by precipitation, which did not fully revert to the equilibrium solubility of HA, was observed during the dissolution of NaA granules in biorelevant media. Physiologically based pharmacokinetic modelling indicated that while intragastric processes had no significant impact on absorption kinetics, dissolution kinetics, kinetic solubility, radial transport rates and, for the 800-mg dose, precipitation kinetics in the small intestine had the greatest impact on absorption profiles.
Conclusions
Adequate prediction of the average plasma profile, after administration of NaA, required consideration of region-dependent dissolution rates and/or solubilisation.
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Affiliation(s)
- Orestis Petrakis
- Faculty of Pharmacy, National & Kapodistrian University of Athens, Athens, Greece
| | - Maria Vertzoni
- Faculty of Pharmacy, National & Kapodistrian University of Athens, Athens, Greece
| | - Alexandros Angelou
- Faculty of Pharmacy, National & Kapodistrian University of Athens, Athens, Greece
| | | | - Kimberly Bentz
- Pharmaceutical R&D, Merck Research Laboratories, West Point, PA, USA
| | | | - Christos Reppas
- Faculty of Pharmacy, National & Kapodistrian University of Athens, Athens, Greece
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14
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Vivian D, Polli JE. Synthesis and in vitro evaluation of bile acid prodrugs of floxuridine to target the liver. Int J Pharm 2014; 475:597-604. [PMID: 25219859 DOI: 10.1016/j.ijpharm.2014.09.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 09/02/2014] [Accepted: 09/09/2014] [Indexed: 01/09/2023]
Abstract
Floxuridine is often used to treat metastatic liver disease and is given as an infusion directly into the hepatic artery to increase the amount of intact drug that reaches the liver. The objective of this work was to design and synthesize prodrugs of floxuridine through conjugation to chenodeoxycholic acid (CDCA) to target the liver via the bile acid liver uptake transporter Na(+)/taurocholate cotransporting polypeptide (NTCP, SLC10A1). Two isomeric prodrugs of floxuridine were synthesized: floxuridine 3'glutamic acid-CDCA and floxuridine 5'-glutamic acid-CDCA. Both were potent inhibitors and substrates of NTCP. Floxuridine 3'glutamic acid-CDCA showed Ki=6.86±1.37 μM, Km=10.7±2.1 μM, and passive permeability=0.663(±0.121)×10(-7) cm/s while floxuridine 5'-glutamic acid-CDCA showed Ki=0.397±0.038 μM, Km=40.4±15.2 μM, and passive permeability=1.72(±0.18)×10(-7) cm/s. Floxuridine itself had a higher passively permeability of 7.54(±0.45)×10(-7) cm/s in the same cell line, indicating that both prodrugs have the potential for lower non-specific effects than the drug alone. Prodrugs were stable in rat plasma (t=3 h), but quickly released in rat liver s9 fraction, suggesting future in vivo evaluation.
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Affiliation(s)
- Diana Vivian
- University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | - James E Polli
- University of Maryland School of Pharmacy, Baltimore, MD 21201, USA.
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15
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Vivian D, Cheng K, Khurana S, Xu S, Dawson PA, Raufman JP, Polli JE. Design and evaluation of a novel trifluorinated imaging agent for assessment of bile acid transport using fluorine magnetic resonance imaging. J Pharm Sci 2014; 103:3782-3792. [PMID: 25196788 DOI: 10.1002/jps.24131] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 07/17/2014] [Accepted: 07/23/2014] [Indexed: 02/01/2023]
Abstract
Previously, we developed a trifluorinated bile acid, CA-lys-TFA, with the objective of noninvasively assessing bile acid transport in vivo using (19) F magnetic resonance imaging (MRI). CA-lys-TFA was successfully imaged in the mouse gallbladder, but was susceptible to deconjugation in vitro by choloylglycine hydrolase (CGH), a bacterial bile acid deconjugating enzyme found in the terminal ileum and colon. The objective of the present study was to develop a novel trifluorinated bile acid resistant to deconjugation by CGH. CA-sar-TFMA was designed, synthesized, and tested for in vitro transport properties, stability, imaging properties, and its ability to differentially accumulate in the gallbladders of normal mice, compared with mice with known impaired bile acid transport (deficient in the apical sodium-dependent bile acid transporter, ASBT). CA-sar-TFMA was a potent inhibitor and substrate of ASBT and the Na(+) /taurocholate cotransporting polypeptide. Stability was favorable in all conditions tested, including the presence of CGH. CA-sar-TFMA was successfully imaged and accumulated at 16.1-fold higher concentrations in gallbladders from wild-type mice compared with those from Asbt-deficient mice. Our results support the potential of using MRI with CA-sar-TFMA as a noninvasive method to assess bile acid transport in vivo.
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Affiliation(s)
- Diana Vivian
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, Maryland 21230
| | - Kunrong Cheng
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21230
| | - Sandeep Khurana
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21230
| | - Su Xu
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21230
| | - Paul A Dawson
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Jean-Pierre Raufman
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21230.
| | - James E Polli
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, Maryland 21230.
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16
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Bergström CA, Holm R, Jørgensen SA, Andersson SB, Artursson P, Beato S, Borde A, Box K, Brewster M, Dressman J, Feng KI, Halbert G, Kostewicz E, McAllister M, Muenster U, Thinnes J, Taylor R, Mullertz A. Early pharmaceutical profiling to predict oral drug absorption: Current status and unmet needs. Eur J Pharm Sci 2014; 57:173-99. [DOI: 10.1016/j.ejps.2013.10.015] [Citation(s) in RCA: 192] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 10/17/2013] [Accepted: 10/27/2013] [Indexed: 01/17/2023]
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17
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Fox CB, Sivananthan SJ, Mikasa TJ, Lin S, Parker SC. Charged aerosol detection to characterize components of dispersed-phase formulations. Adv Colloid Interface Sci 2013; 199-200:59-65. [PMID: 23855968 DOI: 10.1016/j.cis.2013.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2012] [Revised: 05/10/2013] [Accepted: 06/10/2013] [Indexed: 01/22/2023]
Abstract
Colloidal formulations based on biocompatible phospholipids, emulsifiers, and oils are employed in a wide range of applications including medicine, food, and cosmetics. However, characterization of these dispersed-phase components may be difficult to analyze by traditional HPLC with UV, visible, or fluorescence detection modalities due to lack of chromophores or fluorophores. Charged aerosol detection (CAD) is increasingly used for analysis of dispersed-phase components due to its broad applicability and high sensitivity for non-chromophore containing components found in many colloidal systems, such as lipid-based molecules. In this review, we summarize the recent applications of CAD reported in the literature as well as our own laboratory for the analysis of widely used components of dispersed-phase systems. In particular, we discuss the advantages and disadvantages of CAD compared to other HPLC detection methods, as well as the various sample preparation methods suitable for colloidal formulations prior to HPLC-CAD analysis.
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18
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Vivian D, Cheng K, Khurana S, Xu S, Whiterock V, Witter D, Lentz KA, Santone KS, Raufman JP, Polli JE. Design and characterization of a novel fluorinated magnetic resonance imaging agent for functional analysis of bile Acid transporter activity. Pharm Res 2013; 30:1240-51. [PMID: 23319170 DOI: 10.1007/s11095-012-0963-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 12/11/2012] [Indexed: 01/09/2023]
Abstract
PURPOSE To synthesize a trifluorinated bile acid that can be used for (19)F magnetic resonance imaging (MRI) of bile acid enterohepatic circulation, characterize its in vitro transporter affinity, stability, and (19)F-MRI signal, and assess its ability to concentrate in the gallbladder of C57BL/6 mice. METHODS Target compound CA-lys-TFA was synthesized and tested for affinity toward the apical sodium dependent bile acid transporter (hASBT) and the Na+/taurocholate cotransporting polypeptide (hNTCP). In a pilot study, fasted mice were gavaged with vehicle control, 150 mg/kg or 300 mg/kg CA-lys-TFA. CA-lys-TFA in gallbladder, liver and plasma at t = 5 h was quantified. Additionally, a 24-h time course (24 mice across eight time points) was studied using 50 mg/kg CA-lys-TFA. RESULTS CA-lys-TFA was a potent substrate of hASBT (Kt = 39.4 μM, normalized Vmax = 0.853) and hNTCP (Kt = 8.99 μM, normalized Vmax = 0.281). (19)F MRI phantom imaging showed linear signal-concentration dependence. In vivo studies showed that rapid accumulation of CA-lys-TFA in the gallbladder was maximal within 4-7 h. CONCLUSIONS These findings suggest that CA-lys-TFA, a fluorinated non-radioactive bile acid analogue, has potential for use in MRI to measure in vivo bile acid transport and diagnose bile acid malabsorption and other conditions associated with impaired bile acid transport.
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Affiliation(s)
- Diana Vivian
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland 21201, USA
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19
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Lertpiriyapong K, Gamazon ER, Feng Y, Park DS, Pang J, Botka G, Graffam ME, Ge Z, Fox JG. Campylobacter jejuni type VI secretion system: roles in adaptation to deoxycholic acid, host cell adherence, invasion, and in vivo colonization. PLoS One 2012; 7:e42842. [PMID: 22952616 PMCID: PMC3428339 DOI: 10.1371/journal.pone.0042842] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 07/11/2012] [Indexed: 12/21/2022] Open
Abstract
The recently identified type VI secretion system (T6SS) of proteobacteria has been shown to promote pathogenicity, competitive advantage over competing microorganisms, and adaptation to environmental perturbation. By detailed phenotypic characterization of loss-of-function mutants, in silico, in vitro and in vivo analyses, we provide evidence that the enteric pathogen, Campylobacter jejuni, possesses a functional T6SS and that the secretion system exerts pleiotropic effects on two crucial processes--survival in a bile salt, deoxycholic acid (DCA), and host cell adherence and invasion. The expression of T6SS during initial exposure to the upper range of physiological levels of DCA (0.075%-0.2%) was detrimental to C. jejuni proliferation, whereas down-regulation or inactivation of T6SS enabled C. jejuni to resist this effect. The C. jejuni multidrug efflux transporter gene, cmeA, was significantly up-regulated during the initial exposure to DCA in the wild type C. jejuni relative to the T6SS-deficient strains, suggesting that inhibition of proliferation is the consequence of T6SS-mediated DCA influx. A sequential modulation of the efflux transporter activity and the T6SS represents, in part, an adaptive mechanism for C. jejuni to overcome this inhibitory effect, thereby ensuring its survival. C. jejuni T6SS plays important roles in host cell adhesion and invasion as T6SS inactivation resulted in a reduction of adherence to and invasion of in vitro cell lines, while over-expression of a hemolysin co-regulated protein, which encodes a secreted T6SS component, greatly enhanced these processes. When inoculated into B6.129P2-IL-10(tm1Cgn) mice, the T6SS-deficient C. jejuni strains did not effectively establish persistent colonization, indicating that T6SS contributes to colonization in vivo. Taken together, our data demonstrate the importance of bacterial T6SS in host cell adhesion, invasion, colonization and, for the first time to our knowledge, adaptation to DCA, providing new insights into the role of T6SS in C. jejuni pathogenesis.
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Affiliation(s)
- Kvin Lertpiriyapong
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Eric R. Gamazon
- Section of Genetic Medicine, Department of Medicine, The University of Chicago, Chicago, Illinois, United States of America
| | - Yan Feng
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Danny S. Park
- Department of Computer Science, Columbia University, New York, New York, United States of America
| | - Jassia Pang
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Georgina Botka
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Michelle E. Graffam
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Zhongming Ge
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - James G. Fox
- Division of Comparative Medicine, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
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20
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Li GL, Chen G, Liu YQ, Jing NH, You JM. A sensitive and selective HPLC-FLD method with fluorescent labeling for simultaneous detection of bile acid and free fatty acid in human serum. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 895-896:191-5. [DOI: 10.1016/j.jchromb.2012.03.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2011] [Revised: 03/12/2012] [Accepted: 03/16/2012] [Indexed: 11/24/2022]
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21
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Vertzoni M, Markopoulos C, Symillides M, Goumas C, Imanidis G, Reppas C. Luminal Lipid Phases after Administration of a Triglyceride Solution of Danazol in the Fed State and Their Contribution to the Flux of Danazol Across Caco-2 Cell Monolayers. Mol Pharm 2012; 9:1189-98. [DOI: 10.1021/mp200479f] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maria Vertzoni
- Laboratory of Biopharmaceutics and Pharmacokinetics, National & Kapodistrian University of Athens, Zografou, Greece
| | - Constantinos Markopoulos
- Laboratory of Biopharmaceutics and Pharmacokinetics, National & Kapodistrian University of Athens, Zografou, Greece
- Institute of Pharma Technology, University of Applied Sciences Northwestern Switzerland, Muttenz, Switzerland
| | - Moira Symillides
- Laboratory of Biopharmaceutics and Pharmacokinetics, National & Kapodistrian University of Athens, Zografou, Greece
| | - Constantinos Goumas
- Department of Gastroenterology, Red Cross Hospital of Athens, Athens, Greece
| | - Georgios Imanidis
- Institute of Pharma Technology, University of Applied Sciences Northwestern Switzerland, Muttenz, Switzerland
| | - Christos Reppas
- Laboratory of Biopharmaceutics and Pharmacokinetics, National & Kapodistrian University of Athens, Zografou, Greece
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22
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Reppas C, Vertzoni M. Biorelevant in-vitro performance testing of orally administered dosage forms. J Pharm Pharmacol 2012; 64:919-30. [DOI: 10.1111/j.2042-7158.2012.01474.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Abstract
Objectives
This review focuses on the evolution and current status of biorelevant media and hydrodynamics, and discusses the usefulness of biorelevant performance testing in the evaluation of specific dosage form related lumenal processes.
Key findings
During the last 15 years our knowledge of the gastrointestinal environment (including the lower gut) has improved dramatically and biorelevant media composition and, to a lesser extent, biorelevant hydrodynamics, have been refined. Biorelevant dissolution/release testing is useful for the evaluation of formulation and food effects on plasma levels after administration of immediate release dosage forms containing low solubility compounds and after administration of extended release products. Lumenal disintegration times of immediate release dosage forms and the bile acid sequestering activity of resins in the lumen can also be successfully forecasted with biorelevant in vitro testing.
Summary
Biorelevant in-vitro performance testing is an important tool for evaluating intralumenal dosage form performance. Since the formulation of new active pharmaceutical ingredients for oral delivery is more challenging than ever before, efforts to improve the predictability of biorelevant tests are expected to continue.
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Affiliation(s)
- Christos Reppas
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | - Maria Vertzoni
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
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23
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Trinick R, Johnston N, Dalzell AM, McNamara PS. Reflux aspiration in children with neurodisability--a significant problem, but can we measure it? J Pediatr Surg 2012; 47:291-8. [PMID: 22325378 DOI: 10.1016/j.jpedsurg.2011.11.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 11/10/2011] [Indexed: 02/07/2023]
Abstract
Recurrent respiratory problems are common in children with severe neurodisability, and respiratory deterioration is a leading cause of premature death in this group. Although the etiology is multifactorial, recurrent pulmonary aspiration is thought to play a significant role. Gastroesophageal reflux is known to be common, as is oral-motor discoordination. Differentiating direct aspiration of food and saliva and gastric reflux aspiration is difficult and presents a challenge in managing patients and assessing their suitability for surgical antireflux procedures. This is particularly the case when children present with predominantly respiratory symptoms, where there may be direct aspiration, reflux aspiration, neither, or both. A clinical biomarker to identify and quantify reflux aspiration would therefore be useful in surgical assessment and may also be applicable as an outcome measure for clinical trials of antireflux surgery. In this review, we discuss the evidence base behind existing and potentially novel biomarkers of aspiration in bronchoalveolar lavage fluid. We highlight the limitations of the lipid-laden macrophage index, particularly with regard to its specificity and interrater/intrarater reliability. We discuss the laboratory methods available to measure promising new biomarkers (pepsin and bile acids) and highlight their potential advantages and disadvantages. Finally, to understand how aspiration causes clinical signs and symptoms in our patients, we need to study the effect of aspirated substances on the lung, and here we review the available in vivo and in vitro literature.
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Affiliation(s)
- Ruth Trinick
- Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
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24
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Müllertz A, Fatouros DG, Smith JR, Vertzoni M, Reppas C. Insights into Intermediate Phases of Human Intestinal Fluids Visualized by Atomic Force Microscopy and Cryo-Transmission Electron Microscopy ex Vivo. Mol Pharm 2011; 9:237-47. [DOI: 10.1021/mp200286x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anette Müllertz
- Bioneer:FARMA, Department
of Pharmaceutics and Analytical Chemistry, The Faculty
of Pharmaceutical Science, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Dimitrios G. Fatouros
- Department of Pharmaceutical
Technology, School of Pharmacy, Aristotle University of Thessaloniki, 54124, Greece
| | - James R. Smith
- School of Pharmacy and Biomedical
Sciences, University of Portsmouth, St
Michael's Building, White Swan Road, Portsmouth PO1 2DT, United Kingdom
| | - Maria Vertzoni
- Department of Pharmaceutical
Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis
15771 Zografou, Greece
| | - Christos Reppas
- Department of Pharmaceutical
Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis
15771 Zografou, Greece
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25
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Psachoulias D, Vertzoni M, Goumas K, Kalioras V, Beato S, Butler J, Reppas C. Precipitation in and Supersaturation of Contents of the Upper Small Intestine After Administration of Two Weak Bases to Fasted Adults. Pharm Res 2011; 28:3145-58. [DOI: 10.1007/s11095-011-0506-6] [Citation(s) in RCA: 161] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 06/01/2011] [Indexed: 12/28/2022]
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26
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Bevernage J, Brouwers J, Clarysse S, Vertzoni M, Tack J, Annaert P, Augustijns P. Drug supersaturation in simulated and human intestinal fluids representing different nutritional states. J Pharm Sci 2011; 99:4525-34. [PMID: 20845451 DOI: 10.1002/jps.22154] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
It was the purpose of this study to explore supersaturation of poorly soluble drugs in human intestinal fluids (HIF), and to assess potential food effects on the creation and maintenance of supersaturation. Duodenal fluids were collected from healthy volunteers and pooled according to three nutritional states (fasted-, fed-, and fat-enriched fed state). Supersaturation was created at a fixed degree of supersaturation (DS=20) using the solvent-shift method. Fasted- and fed-state simulated intestinal fluids (FaSSIF and FeSSIF) were used as intestinal simulation media. Supersaturation in HIF showed to be stable up to a certain degree for different poorly soluble drugs. In HIF as well as in FaSSIF and FeSSIF, supersaturation appeared to be compound and medium specific. Supersaturation stability was found to be inversely proportional to the solubility in the corresponding media. Food intake affected itraconazole supersaturation positively. On the contrary, etravirine and loviride supersaturation decreased upon food intake. Supersaturation experiments in FaSSIF and FeSSIF showed similar results as in HIF for etravirine and loviride, whereas itraconazole supersaturation behaved differently in HIF versus simulation media. The present study illustrates, for the first time, that supersaturation can be created and maintained in HIF, even in the absence of excipients.
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Affiliation(s)
- Jan Bevernage
- Laboratory for Pharmacotechnology and Biopharmacy, Katholieke Universiteit Leuven, O&N 2, Herestraat 49, Box 921, 3000 Leuven
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27
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Mudie DM, Amidon GL, Amidon GE. Physiological parameters for oral delivery and in vitro testing. Mol Pharm 2010; 7:1388-405. [PMID: 20822152 DOI: 10.1021/mp100149j] [Citation(s) in RCA: 291] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Pharmaceutical solid oral dosage forms must undergo dissolution in the intestinal fluids of the gastrointestinal tract before they can be absorbed and reach the systemic circulation. Therefore, dissolution is a critical part of the drug-delivery process. The rate and extent of drug dissolution and absorption depend on the characteristics of the active ingredient as well as properties of the dosage form. Just as importantly, characteristics of the physiological environment such as buffer species, pH, bile salts, gastric emptying rate, intestinal motility, and hydrodynamics can significantly impact dissolution and absorption. While significant progress has been made since 1970 when the first compendial dissolution test was introduced (USP apparatus 1), current dissolution testing does not take full advantage of the extensive physiologic information that is available. For quality control purposes, where the question is one of lot-to-lot consistency in performance, using nonphysiologic test conditions that match drug and dosage form properties with practical dissolution media and apparatus may be appropriate. However, where in vitro-in vivo correlations are desired, it is logical to consider and utilize knowledge of the in vivo condition. This publication critically reviews the literature that is relevant to oral human drug delivery. Physiologically relevant information must serve as a basis for the design of dissolution test methods and systems that are more representative of the human condition. As in vitro methods advance in their physiological relevance, better in vitro-in vivo correlations will be possible. This will, in turn, lead to in vitro systems that can be utilized to more effectively design dosage forms that have improved and more consistent oral bioperformance.
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Affiliation(s)
- Deanna M Mudie
- College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA
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28
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Ramirez N, Liggins M, Abel-Santos E. Kinetic evidence for the presence of putative germination receptors in Clostridium difficile spores. J Bacteriol 2010; 192:4215-22. [PMID: 20562307 PMCID: PMC2916422 DOI: 10.1128/jb.00488-10] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Accepted: 06/07/2010] [Indexed: 12/23/2022] Open
Abstract
Clostridium difficile is a spore-forming bacterium that causes Clostridium difficile-associated disease (CDAD). Intestinal microflora keeps C. difficile in the spore state and prevents colonization. Following antimicrobial treatment, the microflora is disrupted, and C. difficile spores germinate in the intestines. The resulting vegetative cells are believed to fill empty niches left by the depleted microbial community and establish infection. Thus, germination of C. difficile spores is the first required step in CDAD. Interestingly, C. difficile genes encode most known spore-specific protein necessary for germination, except for germination (Ger) receptors. Even though C. difficile Ger receptors have not been identified, taurocholate (a bile salt) and glycine (an amino acid) have been shown to be required for spore germination. Furthermore, chenodeoxycholate, another bile salt, can inhibit taurocholate-induced C. difficile spore germination. In the present study, we examined C. difficile spore germination kinetics to determine whether taurocholate acts as a specific germinant that activates unknown germination receptors or acts nonspecifically by disrupting spores' membranes. Kinetic analysis of C. difficile spore germination suggested the presence of distinct receptors for taurocholate and glycine. Furthermore, taurocholate, glycine, and chenodeoxycholate seem to bind to C. difficile spores through a complex mechanism, where both receptor homo- and heterocomplexes are formed. The kinetic data also point to an ordered sequential progression of binding where taurocholate must be recognized first before detection of glycine can take place. Finally, comparing calculated kinetic parameters with intestinal concentrations of the two germinants suggests a mechanism for the preferential germination of C. difficile spores in antibiotic-treated individuals.
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Affiliation(s)
- Norma Ramirez
- Department of Chemistry, University of Nevada, Las Vegas, Las Vegas, Nevada 89154
| | - Marc Liggins
- Department of Chemistry, University of Nevada, Las Vegas, Las Vegas, Nevada 89154
| | - Ernesto Abel-Santos
- Department of Chemistry, University of Nevada, Las Vegas, Las Vegas, Nevada 89154
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Vertzoni M, Diakidou A, Chatzilias M, Söderlind E, Abrahamsson B, Dressman JB, Reppas C. Biorelevant Media to Simulate Fluids in the Ascending Colon of Humans and Their Usefulness in Predicting Intracolonic Drug Solubility. Pharm Res 2010; 27:2187-96. [DOI: 10.1007/s11095-010-0223-6] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Accepted: 07/14/2010] [Indexed: 10/19/2022]
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Vehovec T, Obreza A. Review of operating principle and applications of the charged aerosol detector. J Chromatogr A 2010; 1217:1549-56. [PMID: 20083252 DOI: 10.1016/j.chroma.2010.01.007] [Citation(s) in RCA: 157] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Revised: 12/27/2009] [Accepted: 01/05/2010] [Indexed: 11/25/2022]
Abstract
Recently a new detection method, based upon aerosol charging (the charged aerosol detector (CAD)) has been introduced as an alternative to evaporative light-scattering detector (ELSD), chemiluminescent nitrogen detector and refractive index detector for detection of non-ultraviolet and weakly ultraviolet active compounds and for UV-absorbing compounds in the absence of standards. The content of this review article includes description of operation principle, advantages and disadvantages of CAD system, and short reports of selected applications of this detector. The main advantages of CAD detector are unique performance characteristics: better sensitivity than ELSD system, a dynamic range of up to 4 orders of magnitude, ease of use and constancy of response factors. Both detectors are mass dependent and the response generated does not depend on the spectral or physicochemical properties of the analyte. This attractive feature of a detection technique generating universal response factors is the potential use of a single, universal standard for calibration against which all other compounds or impurities can be qualified. CAD also has the same limitation as ELSD, namely, the response is affected by mobile-phase composition. This problem has been resolved by using inverse gradient compensation as is done for high pressure liquid chromatography and supercritical fluid chromatography. CAD has been applied for the analysis of structurally diverse compounds used in the pharmaceutical, chemical, food, and consumer products industries and in life science research. They include nonvolatile and semivolatile neutral, acidic, basic, and zwitterionic compounds, both polar and nonpolar (e.g. lipids, proteins, steroids, polymers, carbohydrates, peptides).
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Affiliation(s)
- Tanja Vehovec
- Stability Testing Department, Krka d.d., Smarjeska cesta 6, 8501 Novo mesto, Slovenia.
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Diakidou A, Vertzoni M, Goumas K, Söderlind E, Abrahamsson B, Dressman J, Reppas C. Characterization of the Contents of Ascending Colon to Which Drugs are Exposed After Oral Administration to Healthy Adults. Pharm Res 2009; 26:2141-51. [DOI: 10.1007/s11095-009-9927-x] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Accepted: 06/11/2009] [Indexed: 02/06/2023]
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