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Yu A, Koenigsknecht MJ, Hens B, Baker JR, Wen B, Jackson TL, Pai MP, Hasler W, Amidon GL, Sun D. Mechanistic Deconvolution of Oral Absorption Model with Dynamic Gastrointestinal Fluid to Predict Regional Rate and Extent of GI Drug Dissolution. AAPS J 2019; 22:3. [PMID: 31712917 DOI: 10.1208/s12248-019-0385-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Accepted: 09/23/2019] [Indexed: 12/20/2022]
Abstract
Multiple approaches such as mathematical deconvolution and mechanistic oral absorption models have been used to predict in vivo drug dissolution in the gastrointestinal (GI) tract. However, these approaches are often validated by plasma pharmacokinetic profiles, but not by in vivo drug dissolution due to the limited data available regarding the local GI environment. It is also challenging to predict and validate in vivo dissolution in different regions of the GI tract (stomach, duodenum, jejunum, and ileum). In this study, the dynamic fluid compartment absorption and transport (DFCAT) model was used to predict the in vivo dissolution profiles of ibuprofen, which was administered as an 800-mg immediate-release tablet to healthy subjects, in different regions of the GI tract. The prediction was validated with concentration time-courses of ibuprofen (BCS class 2a) in different regions of the GI tract that we have obtained over the past few years. The computational model predicted that the dissolution of ibuprofen was minimal in the stomach (2%), slightly more in the duodenum (6.3%), and primarily dissolved in the jejunum (63%) and the ileum (25%). The detailed model prediction of drug dissolution in different regions of GI can provide a quantitative reference of in vivo dissolution that may provide valuable insight in developing in vitro tests for drug product optimization and quality.
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Affiliation(s)
- Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Mark J Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Jason R Baker
- Department of Internal Medicine, College of Medicine, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Trachette L Jackson
- Department of Mathematics, College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Manjunath P Pai
- Department of Clinical Pharmacy, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA
| | - William Hasler
- Department of Internal Medicine, College of Medicine, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA. .,North Campus Research Complex (NCRC), Room 3353, Building 520,1600 Huron Parkway, Ann Arbor, MI, 48109, USA.
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Seekatz AM, Schnizlein MK, Koenigsknecht MJ, Baker JR, Hasler WL, Bleske BE, Young VB, Sun D. Spatial and Temporal Analysis of the Stomach and Small-Intestinal Microbiota in Fasted Healthy Humans. mSphere 2019; 4:e00126-19. [PMID: 30867328 PMCID: PMC6416366 DOI: 10.1128/msphere.00126-19] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [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: 02/22/2019] [Accepted: 02/23/2019] [Indexed: 02/07/2023] Open
Abstract
Although the microbiota in the proximal gastrointestinal (GI) tract have been implicated in health and disease, much about these microbes remains understudied compared to those in the distal GI tract. This study characterized the microbiota across multiple proximal GI sites over time in healthy individuals. As part of a study of the pharmacokinetics of oral mesalamine administration, healthy, fasted volunteers (n = 8; 10 observation periods total) were orally intubated with a four-lumen catheter with multiple aspiration ports. Samples were taken from stomach, duodenal, and multiple jejunal sites, sampling hourly (≤7 h) to measure mesalamine (administered at t = 0), pH, and 16S rRNA gene-based composition. We observed a predominance of Firmicutes across proximal GI sites, with significant variation compared to stool. The microbiota was more similar within individuals over time than between subjects, with the fecal microbiota being unique from that of the small intestine. The stomach and duodenal microbiota displayed highest intraindividual variability compared to jejunal sites, which were more stable across time. We observed significant correlations in the duodenal microbial composition with changes in pH; linear mixed models identified positive correlations with multiple Streptococcus operational taxonomic units (OTUs) and negative correlations with multiple Prevotella and Pasteurellaceae OTUs. Few OTUs correlated with mesalamine concentration. The stomach and duodenal microbiota exhibited greater compositional dynamics than the jejunum. Short-term fluctuations in the duodenal microbiota were correlated with pH. Given the unique characteristics and dynamics of the proximal GI tract microbiota, it is important to consider these local environments in health and disease states.IMPORTANCE The gut microbiota are linked to a variety of gastrointestinal diseases, including inflammatory bowel disease. Despite this importance, microbiota dynamics in the upper gastrointestinal tract are understudied. Our article seeks to understand what factors impact microbiota dynamics in the healthy human upper gut. We found that the upper gastrointestinal tract contains consistently prevalent bacterial OTUs that dominate the overall community. Microbiota variability is highest in the stomach and duodenum and correlates with pH.
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Affiliation(s)
- Anna M Seekatz
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
| | - Matthew K Schnizlein
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
| | - Mark J Koenigsknecht
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan, USA
| | - Jason R Baker
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, Michigan, USA
| | - William L Hasler
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, Michigan, USA
| | - Barry E Bleske
- Department of Pharmacy Practice and Administrative Sciences, University of New Mexico, Albuquerque, New Mexico, USA
| | - Vincent B Young
- Department of Internal Medicine, Division of Infectious Disease, University of Michigan, Ann Arbor, Michigan, USA
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, Michigan, USA
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Bermejo M, Paixão P, Hens B, Tsume Y, Koenigsknecht MJ, Baker JR, Hasler WL, Lionberger R, Fan J, Dickens J, Shedden K, Wen B, Wysocki J, Löbenberg R, Lee A, Frances A, Amidon GE, Yu A, Salehi N, Talattof A, Benninghoff G, Sun D, Kuminek G, Cavanagh KL, Rodríguez-Hornedo N, Amidon GL. Linking the Gastrointestinal Behavior of Ibuprofen with the Systemic Exposure between and within Humans-Part 1: Fasted State Conditions. Mol Pharm 2018; 15:5454-5467. [PMID: 30372084 DOI: 10.1021/acs.molpharmaceut.8b00515] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The goal of this project was to explore and to statistically evaluate the responsible gastrointestinal (GI) factors that are significant factors in explaining the systemic exposure of ibuprofen, between and within human subjects. In a previous study, we determined the solution and total concentrations of ibuprofen as a function of time in aspirated GI fluids, after oral administration of an 800 mg IR tablet (reference standard) of ibuprofen to 20 healthy volunteers in fasted state conditions. In addition, we determined luminal pH and motility pressure recordings that were simultaneously monitored along the GI tract. Blood samples were taken to determine ibuprofen plasma levels. In this work, an in-depth statistical and pharmacokinetic analysis was performed to explain which underlying GI variables are determining the systemic concentrations of ibuprofen between (inter-) and within (intra-) subjects. In addition, the obtained plasma profiles were deconvoluted to link the fraction absorbed with the fraction dissolved. Multiple linear regressions were performed to explain and quantitatively express the impact of underlying GI physiology on systemic exposure of the drug (in terms of plasma Cmax/AUC and plasma Tmax). The exploratory analysis of the correlation between plasma Cmax/AUC and the time to the first phase III contractions postdose (TMMC-III) explains ∼40% of the variability in plasma Cmax for all fasted state subjects. We have experimentally shown that the in vivo intestinal dissolution of ibuprofen is dependent upon physiological variables like, in this case, pH and postdose phase III contractions. For the first time, this work presents a thorough statistical analysis explaining how the GI behavior of an ionized drug can explain the systemic exposure of the drug based on the individual profiles of participating subjects. This creates a scientifically based and rational framework that emphasizes the importance of including pH and motility in a predictive in vivo dissolution methodology to forecast the in vivo performance of a drug product. Moreover, as no extensive first-pass metabolism is considered for ibuprofen, this study demonstrates how intraluminal drug behavior is reflecting the systemic exposure of a drug.
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Affiliation(s)
- Marival Bermejo
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States.,Department of Engineering, Pharmacy Section , Miguel Hernandez University , San Juan de Alicante, 03550 Alicante , Spain
| | - Paulo Paixão
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy , Universidade de Lisboa , Avenida Professor Gama Pinto , 1649-003 Lisboa , Portugal
| | - Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States.,Department of Pharmaceutical and Pharmacological Sciences , KU Leuven , Herestraat 49 , 3000 Leuven , Belgium
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Mark J Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | | | | | - Robert Lionberger
- Office of Generic Drugs, Center for Drug Evaluation and Research , U.S. Food and Drug Administration , Silver Spring , Maryland 20993 , United States
| | - Jianghong Fan
- Office of Generic Drugs, Center for Drug Evaluation and Research , U.S. Food and Drug Administration , Silver Spring , Maryland 20993 , United States
| | | | | | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Jeffrey Wysocki
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Raimar Löbenberg
- Faculty of Pharmacy & Pharmaceutical Sciences , University of Alberta , Edmonton , Alberta , Canada T6G 2H7
| | - Allen Lee
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Ann Frances
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gregory E Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Niloufar Salehi
- Center for the Study of Complex Systems and Department of Chemical Engineering , University of Michigan , Ann Arbor , Michigan 48109-2136 , United States
| | - Arjang Talattof
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gail Benninghoff
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gislaine Kuminek
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Katie L Cavanagh
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Naír Rodríguez-Hornedo
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Michigan , 428 Church Street , Ann Arbor , Michigan 48109-1065 , United States
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4
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Paixão P, Bermejo M, Hens B, Tsume Y, Dickens J, Shedden K, Salehi N, Koenigsknecht MJ, Baker JR, Hasler WL, Lionberger R, Fan J, Wysocki J, Wen B, Lee A, Frances A, Amidon GE, Yu A, Benninghoff G, Löbenberg R, Talattof A, Sun D, Amidon GL. Linking the Gastrointestinal Behavior of Ibuprofen with the Systemic Exposure between and within Humans—Part 2: Fed State. Mol Pharm 2018; 15:5468-5478. [DOI: 10.1021/acs.molpharmaceut.8b00736] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paulo Paixão
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Professor Gama Pinto, 1649-003 Lisboa, Portugal
| | - Marival Bermejo
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
- Department of Engineering, Pharmacy Section, Miguel Hernandez University, San Juan de Alicante, 03550 Alicante, Spain
| | - Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
- Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | | | | | - Niloufar Salehi
- Center for the Study of Complex Systems and Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136, United States
| | - Mark J. Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Jason R. Baker
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - William L. Hasler
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Robert Lionberger
- Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Jianghong Fan
- Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland 20993, United States
| | - Jeffrey Wysocki
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Allen Lee
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Ann Frances
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Gregory E. Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Gail Benninghoff
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Raimar Löbenberg
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2H7
| | - Arjang Talattof
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
| | - Gordon L. Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109–1065, United States
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5
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Truax AD, Chen L, Tam JW, Cheng N, Guo H, Koblansky AA, Chou WC, Wilson JE, Brickey WJ, Petrucelli A, Liu R, Cooper DE, Koenigsknecht MJ, Young VB, Netea MG, Stienstra R, Sartor RB, Montgomery SA, Coleman RA, Ting JPY. The Inhibitory Innate Immune Sensor NLRP12 Maintains a Threshold against Obesity by Regulating Gut Microbiota Homeostasis. Cell Host Microbe 2018; 24:364-378.e6. [PMID: 30212649 PMCID: PMC6161752 DOI: 10.1016/j.chom.2018.08.009] [Citation(s) in RCA: 129] [Impact Index Per Article: 21.5] [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: 05/25/2018] [Revised: 07/19/2018] [Accepted: 08/03/2018] [Indexed: 12/16/2022]
Abstract
In addition to high-fat diet (HFD) and inactivity, inflammation and microbiota composition contribute to obesity. Inhibitory immune receptors, such as NLRP12, dampen inflammation and are important for resolving inflammation, but their role in obesity is unknown. We show that obesity in humans correlates with reduced expression of adipose tissue NLRP12. Similarly, Nlrp12-/- mice show increased weight gain, adipose deposition, blood glucose, NF-κB/MAPK activation, and M1-macrophage polarization. Additionally, NLRP12 is required to mitigate HFD-induced inflammasome activation. Co-housing with wild-type animals, antibiotic treatment, or germ-free condition was sufficient to restrain inflammation, obesity, and insulin tolerance in Nlrp12-/- mice, implicating the microbiota. HFD-fed Nlrp12-/- mice display dysbiosis marked by increased obesity-associated Erysipelotrichaceae, but reduced Lachnospiraceae family and the associated enzymes required for short-chain fatty acid (SCFA) synthesis. Lachnospiraceae or SCFA administration attenuates obesity, inflammation, and dysbiosis. These findings reveal that Nlrp12 reduces HFD-induced obesity by maintaining beneficial microbiota.
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Affiliation(s)
- Agnieszka D Truax
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Liang Chen
- Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Microbiology and Immunology, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Jason W Tam
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Ning Cheng
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Oral and Craniofacial Biomedicine Program, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Hao Guo
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - A Alicia Koblansky
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Wei-Chun Chou
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Justin E Wilson
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - W June Brickey
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Microbiology and Immunology, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Alex Petrucelli
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Rongrong Liu
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Daniel E Cooper
- Department of Nutrition, Gillings School of Global Public Health, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Mark J Koenigsknecht
- Department of Internal Medicine, Division of Infectious Diseases, University of Michigan, Ann Arbor, MI, USA
| | - Vincent B Young
- Department of Internal Medicine, Division of Infectious Diseases, University of Michigan, Ann Arbor, MI, USA
| | - Mihai G Netea
- Department of Internal Medicine and Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Rinke Stienstra
- Department of Internal Medicine and Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - R Balfour Sartor
- Center for Gastrointestinal Biology and Disease, Departments of Medicine, Microbiology, and Immunology, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Stephanie A Montgomery
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Pathology and Laboratory Medicine, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Rosalind A Coleman
- Department of Nutrition, Gillings School of Global Public Health, UNC-Chapel Hill, Chapel Hill, NC, USA
| | - Jenny P-Y Ting
- Lineberger Comprehensive Cancer Center, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Genetics, UNC-Chapel Hill, Chapel Hill, NC, USA; Department of Microbiology and Immunology, UNC-Chapel Hill, Chapel Hill, NC, USA.
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6
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Paixão P, Bermejo M, Hens B, Tsume Y, Dickens J, Shedden K, Salehi N, Koenigsknecht MJ, Baker JR, Hasler WL, Lionberger R, Fan J, Wysocki J, Wen B, Lee A, Frances A, Amidon GE, Yu A, Benninghoff G, Löbenberg R, Talattof A, Sun D, Amidon GL. Gastric emptying and intestinal appearance of nonabsorbable drugs phenol red and paromomycin in human subjects: A multi-compartment stomach approach. Eur J Pharm Biopharm 2018; 129:162-174. [DOI: 10.1016/j.ejpb.2018.05.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/21/2018] [Accepted: 05/28/2018] [Indexed: 10/16/2022]
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7
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Koenigsknecht MJ, Baker JR, Wen B, Frances A, Zhang H, Yu A, Zhao T, Tsume Y, Pai MP, Bleske BE, Zhang X, Lionberger R, Lee A, Amidon GL, Hasler WL, Sun D. In Vivo Dissolution and Systemic Absorption of Immediate Release Ibuprofen in Human Gastrointestinal Tract under Fed and Fasted Conditions. Mol Pharm 2017; 14:4295-4304. [PMID: 28937221 DOI: 10.1021/acs.molpharmaceut.7b00425] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In vivo drug dissolution in the gastrointestinal (GI) tract is largely unmeasured. The purpose of this clinical study was to evaluate the in vivo drug dissolution and systemic absorption of the BCS class IIa drug ibuprofen under fed and fasted conditions by direct sampling of stomach and small intestinal luminal content. Expanding current knowledge of drug dissolution in vivo will help to establish physiologically relevant in vitro models predictive of drug dissolution. A multilumen GI catheter was orally inserted into the GI tract of healthy human subjects. Subjects received a single oral dose of ibuprofen (800 mg tablet) with 250 mL of water under fasting and fed conditions. The GI catheter facilitated collection of GI fluid from the stomach, duodenum, and jejunum. Ibuprofen concentration in GI fluid supernatant and plasma was determined by LC-MS/MS. A total of 23 subjects completed the study, with 11 subjects returning for an additional study visit (a total of 34 completed study visits). The subjects were primarily white (61%) and male (65%) with an average age of 30 years. The subjects had a median [min, max] weight of 79 [52, 123] kg and body mass index of 25.7 [19.4, 37.7] kg/m2. Ibuprofen plasma levels were higher under fasted conditions and remained detectable for 28 h under both conditions. The AUC0-24 and Cmax were lower in fed subjects vs fasted subjects, and Tmax was delayed in fed subjects vs fasted subjects. Ibuprofen was detected immediately after ingestion in the stomach under fasting and fed conditions until 7 h after dosing. Higher levels of ibuprofen were detected in the small intestine soon after dosing in fasted subjects compared to fed. In contrast to plasma drug concentration, overall gastric concentrations remained higher under fed conditions due to increased gastric pH vs fasting condition. The gastric pH increased to near neutrality after feedingbefore decreasing to acidic levels after 7 h. Induction of the fed state reduced systemic levels but increased gastric levels of ibuprofen, which suggest that slow gastric emptying and transit dominate the effect for plasma drug concentration. The finding of high levels of ibuprofen in stomach and small intestine 7 h post dosing was unexpected. Future work is needed to better understand the role of various GI parameters, such as motility and gastric emptying, on systemic ibuprofen levels in order to improve in vitro predictive models.
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Affiliation(s)
- Mark J Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Jason R Baker
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Ann Frances
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Huixia Zhang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Ting Zhao
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Manjunath P Pai
- Department of Clinical Pharmacy, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Barry E Bleske
- Department of Pharmacy Practice and Administrative Sciences, College of Pharmacy, University of New Mexico , Albuquerque, New Mexico 87120, United States
| | - Xinyuan Zhang
- Office of Research and Standards, Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration , Silver Spring, Maryland 20993, United States
| | - Robert Lionberger
- Office of Research and Standards, Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration , Silver Spring, Maryland 20993, United States
| | - Allen Lee
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - William L Hasler
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
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Hens B, Tsume Y, Bermejo M, Paixao P, Koenigsknecht MJ, Baker JR, Hasler WL, Lionberger R, Fan J, Dickens J, Shedden K, Wen B, Wysocki J, Loebenberg R, Lee A, Frances A, Amidon G, Yu A, Benninghoff G, Salehi N, Talattof A, Sun D, Amidon GL. Low Buffer Capacity and Alternating Motility along the Human Gastrointestinal Tract: Implications for in Vivo Dissolution and Absorption of Ionizable Drugs. Mol Pharm 2017; 14:4281-4294. [PMID: 28737409 DOI: 10.1021/acs.molpharmaceut.7b00426] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In this study, we determined the pH and buffer capacity of human gastrointestinal (GI) fluids (aspirated from the stomach, duodenum, proximal jejunum, and mid/distal jejunum) as a function of time, from 37 healthy subjects after oral administration of an 800 mg immediate-release tablet of ibuprofen (reference listed drug; RLD) under typical prescribed bioequivalence (BE) study protocol conditions in both fasted and fed states (simulated by ingestion of a liquid meal). Simultaneously, motility was continuously monitored using water-perfused manometry. The time to appearance of phase III contractions (i.e., housekeeper wave) was monitored following administration of the ibuprofen tablet. Our results clearly demonstrated the dynamic change in pH as a function of time and, most significantly, the extremely low buffer capacity along the GI tract. The buffer capacity on average was 2.26 μmol/mL/ΔpH in fasted state (range: 0.26 and 6.32 μmol/mL/ΔpH) and 2.66 μmol/mL/ΔpH in fed state (range: 0.78 and 5.98 μmol/mL/ΔpH) throughout the entire upper GI tract (stomach, duodenum, and proximal and mid/distal jejunum). The implication of this very low buffer capacity of the human GI tract is profound for the oral delivery of both acidic and basic active pharmaceutical ingredients (APIs). An in vivo predictive dissolution method would require not only a bicarbonate buffer but also, more significantly, a low buffer capacity of dissolution media to reflect in vivo dissolution conditions.
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Affiliation(s)
- Bart Hens
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Marival Bermejo
- Department of Engineering, Pharmacy Section, Miguel Hernandez University , San Juan de Alicante, 03550 Alicante, Spain
| | - Paulo Paixao
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa , Avenida Professor Gama Pinto, 1649-003 Lisboa, Portugal
| | - Mark J Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Jason R Baker
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - William L Hasler
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Robert Lionberger
- Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration , Silver Spring, Maryland 20993, United States
| | - Jianghong Fan
- Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration , Silver Spring, Maryland 20993, United States
| | - Joseph Dickens
- Department of Statistics, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Kerby Shedden
- Department of Statistics, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Jeffrey Wysocki
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Raimar Loebenberg
- Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta , Edmonton, Alberta, Canada T6G 2H7
| | - Allen Lee
- Department of Engineering, Pharmacy Section, Miguel Hernandez University , San Juan de Alicante, 03550 Alicante, Spain
| | - Ann Frances
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Greg Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Gail Benninghoff
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Niloufar Salehi
- Center for the Study of Complex Systems and Department of Chemical Engineering, University of Michigan , Ann Arbor, Michigan 48109-2136, United States
| | - Arjang Talattof
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
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Dahl JU, Gray MJ, Bazopoulou D, Beaufay F, Lempart J, Koenigsknecht MJ, Wang Y, Baker JR, Hasler WL, Young VB, Sun D, Jakob U. The anti-inflammatory drug mesalamine targets bacterial polyphosphate accumulation. Nat Microbiol 2017; 2:16267. [PMID: 28112760 DOI: 10.1038/nmicrobiol.2016.267] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 12/12/2016] [Indexed: 01/09/2023]
Abstract
Mesalamine serves as the gold standard in treating ulcerative colitis. However, its precise mechanism(s) of action remains unclear. Here, we show that mesalamine treatment rapidly decreases polyphosphate levels in diverse bacteria, including members of the human gut microbiome. This decrease sensitizes bacteria towards oxidative stress, reduces colonization and attenuates persister cell and biofilm formation, suggesting that mesalamine aids in diminishing the capacity of bacteria to persist within chronically inflamed environments.
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Affiliation(s)
- Jan-Ulrik Dahl
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Michael J Gray
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Daphne Bazopoulou
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Francois Beaufay
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Justine Lempart
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Mark J Koenigsknecht
- Department of Pharmaceutical Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Ying Wang
- Department of Pharmaceutical Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Jason R Baker
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - William L Hasler
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Vincent B Young
- Department of Internal Medicine/Division of Infectious Diseases &Department of Microbiology and Immunology, The University of Michigan Medical School, Ann Arbor, Michigan 48109, USA
| | - Duxin Sun
- Department of Pharmaceutical Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Ursula Jakob
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109, USA
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Yu A, Baker JR, Fioritto AF, Wang Y, Luo R, Li S, Wen B, Bly M, Tsume Y, Koenigsknecht MJ, Zhang X, Lionberger R, Amidon GL, Hasler WL, Sun D. Measurement of in vivo Gastrointestinal Release and Dissolution of Three Locally Acting Mesalamine Formulations in Regions of the Human Gastrointestinal Tract. Mol Pharm 2016; 14:345-358. [PMID: 28009518 DOI: 10.1021/acs.molpharmaceut.6b00641] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
As an orally administered, locally acting gastrointestinal drug, mesalamine products are designed to achieve high local drug concentration in the gastrointestinal (GI) tract for the treatment of ulcerative colitis. The aim of this study was to directly measure and compare drug dissolution of three mesalamine formulations in human GI tract and to correlate their GI concentration with drug concentration in plasma. Healthy human subjects were orally administered Pentasa, Apriso, or Lialda. GI fluids were aspirated from stomach, duodenum, proximal jejunum, mid jejunum, and distal jejunum regions. Mesalamine (5-ASA) and its primary metabolite acetyl-5-mesalamine (Ac-5-ASA) were measured using LC-MS/MS. GI tract pH was measured from each GI fluid sample, which averaged 1.82, 4.97, 5.67, 6.17, and 6.62 in the stomach, duodenum, proximal jejunum, middle jejunum, and distal jejunum, respectively. For Pentasa, high levels of 5-ASA in solution were observed in the stomach, duodenum, proximal jejunum, mid jejunum, and distal jejunum from 1 to 7 h. Apriso had minimal 5-ASA levels in stomach, low to medium levels of 5-ASA in duodenum and proximal jejunum from 4 to 7 h, and high levels of 5-ASA in distal jejunum from 3 to 7 h. In contrast, Lialda had minimal 5-ASA levels from stomach and early small intestine. A composite appearance rate (CAR) was calculated from the deconvolution of individual plasma concentration to reflect drug release, dissolution, transit, and absorption in the GI tract. Individuals dosed with Pentasa had high levels of CAR from 1 to 10 h; individuals dosed with Apriso had low levels of CAR from 1 to 4 h and high levels of CAR from 5 to 10 h; Lialda showed minimal levels of CAR from 0 to 5 h, then increased to medium levels from 5 to 12 h, and then decreased to further lower levels after 12 h. In the colon region, Pentasa and Apriso showed similar levels of accumulated 5-ASA excreted in the feces, while Lialda showed slightly higher 5-ASA accumulation in feces. However, all three formulations showed similar levels of metabolite Ac-5-ASA in the feces. These results provide direct measurement of drug dissolution in the GI tract, which can serve as a basis for investigation of bioequivalence for locally acting drug products.
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Affiliation(s)
- Alex Yu
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Jason R Baker
- Department of Internal Medicine, College of Medicine, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Ann F Fioritto
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Ying Wang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Ruijuan Luo
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Siwei Li
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Bo Wen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Michael Bly
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Yasuhiro Tsume
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Mark J Koenigsknecht
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Xinyuan Zhang
- Office of Research and Standards, Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration , Silver Spring, Maryland 20993, United States
| | - Robert Lionberger
- Office of Research and Standards, Office of Generic Drugs, Center for Drug Evaluation and Research, U.S. Food and Drug Administration , Silver Spring, Maryland 20993, United States
| | - Gordon L Amidon
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - William L Hasler
- Department of Internal Medicine, College of Medicine, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Duxin Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan , Ann Arbor, Michigan 48109, United States
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11
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Theriot CM, Koenigsknecht MJ, Carlson PE, Hatton GE, Nelson AM, Li B, Huffnagle GB, Z Li J, Young VB. Antibiotic-induced shifts in the mouse gut microbiome and metabolome increase susceptibility to Clostridium difficile infection. Nat Commun 2015; 5:3114. [PMID: 24445449 PMCID: PMC3950275 DOI: 10.1038/ncomms4114] [Citation(s) in RCA: 647] [Impact Index Per Article: 71.9] [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: 09/27/2013] [Accepted: 12/16/2013] [Indexed: 02/07/2023] Open
Abstract
Antibiotics can have significant and long lasting effects on the gastrointestinal tract microbiota, reducing colonization resistance against pathogens including Clostridium difficile. Here we show that antibiotic treatment induces substantial changes in the gut microbial community and in the metabolome of mice susceptible to C. difficile infection. Levels of secondary bile acids, glucose, free fatty acids, and dipeptides decrease, whereas those of primary bile acids and sugar alcohols increase, reflecting the modified metabolic activity of the altered gut microbiome. In vitro and ex vivo analyses demonstrate that C. difficile can exploit specific metabolites that become more abundant in the mouse gut after antibiotics, including primary bile acid taurocholate for germination, and carbon sources mannitol, fructose, sorbitol, raffinose and stachyose for growth. Our results indicate that antibiotic-mediated alteration of the gut microbiome converts the global metabolic profile to one that favors C. difficile germination and growth.
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Affiliation(s)
- Casey M Theriot
- 1] Division of Infectious Diseases, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA [2] Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Mark J Koenigsknecht
- 1] Division of Infectious Diseases, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA [2] Department of Microbiology and Immunology, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Paul E Carlson
- Department of Microbiology and Immunology, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Gabrielle E Hatton
- Division of Infectious Diseases, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Adam M Nelson
- 1] Division of Infectious Diseases, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA [2] Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Bo Li
- Department of Human Genetics, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Gary B Huffnagle
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Jun Z Li
- Department of Human Genetics, The University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Vincent B Young
- 1] Division of Infectious Diseases, Department of Internal Medicine, The University of Michigan, Ann Arbor, Michigan 48109, USA [2] Department of Microbiology and Immunology, The University of Michigan, Ann Arbor, Michigan 48109, USA
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12
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Koenigsknecht MJ, Lambrecht JA, Fenlon LA, Downs DM. Perturbations in histidine biosynthesis uncover robustness in the metabolic network of Salmonella enterica. PLoS One 2012; 7:e48207. [PMID: 23133571 PMCID: PMC3485032 DOI: 10.1371/journal.pone.0048207] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [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: 08/06/2012] [Accepted: 09/25/2012] [Indexed: 11/18/2022] Open
Abstract
Phosphoribosylamine (PRA) is an intermediate in the biosynthetic pathway that is common to thiamine and purines. Glutamine phosphoribosyl pyrophosphate (PRPP) amidotransferase is the product of the purF gene in Salmonella enterica and catalyzes the synthesis of PRA from PRPP and glutamine. Strains lacking PurF require exogenous addition of purines for growth. However, under some growth conditions or with specific secondary mutations these strains grow in the absence of exogenous thiamine. Mutant alleles of hisA, which encodes 1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino) methylideneamino] imidazole-4-carboxamide (ProFAR) isomerase, allowed PurF-independent PRA formation. The alleles of hisA that suppressed the requirement for exogenous thiamine resulted in proteins with reduced enzymatic activity. Data presented here showed that decreased activity of HisA altered metabolite pools and allowed PRA formation from ProFAR. Possible mechanisms of this conversion were proposed. The results herein emphasize the plasticity of the metabolic network and specifically highlight the potential for chemical syntheses to contribute to network robustness.
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Affiliation(s)
- Mark J. Koenigsknecht
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Jennifer A. Lambrecht
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Luke A. Fenlon
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Diana M. Downs
- Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
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13
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Koenigsknecht MJ, Fenlon LA, Downs DM. Phosphoribosylpyrophosphate synthetase (PrsA) variants alter cellular pools of ribose 5-phosphate and influence thiamine synthesis in Salmonella enterica. Microbiology (Reading) 2010. [DOI: 10.1099/mic.0.30650-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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14
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Koenigsknecht MJ, Downs DM. Thiamine biosynthesis can be used to dissect metabolic integration. Trends Microbiol 2010; 18:240-7. [PMID: 20382023 DOI: 10.1016/j.tim.2010.03.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Revised: 02/19/2010] [Accepted: 03/08/2010] [Indexed: 10/19/2022]
Abstract
The emergence of systems biology has re-emphasized the advantages of understanding biological processes with a global perspective. One biological process amenable to global approaches is microbial metabolism. This review describes a model system that contributes to the goals of systems biology by experimentally defining metabolic integration found in a bacterial cell and thus providing data needed for implementation and interpretation of systems approaches. We have taken a largely unbiased in vivo approach centered on thiamine biosynthesis to identify new metabolic components and connections, and to explore uncharacterized paradigms of the integration between them. This article summarizes recent results from this approach that include the identification of the function of unknown genes, connections between cofactors biosynthesis and thiamine biosynthesis, and how metabolites from one biosynthetic pathway can be used in thiamine biosynthesis.
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Affiliation(s)
- Mark J Koenigsknecht
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA
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15
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Koenigsknecht MJ, Fenlon LA, Downs DM. Phosphoribosylpyrophosphate synthetase (PrsA) variants alter cellular pools of ribose 5-phosphate and influence thiamine synthesis in Salmonella enterica. Microbiology (Reading) 2009; 156:950-959. [PMID: 19959576 DOI: 10.1099/mic.0.033050-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Phosphoribosylamine (PRA) is the first intermediate in the common purine/thiamine biosynthetic pathway and is primarily synthesized by the product of the purF gene, glutamine phosphoribosylpyrophosphate (PRPP) amidotransferase (E.C. 2.4.2.14). Past genetic and biochemical studies have shown that multiple mechanisms for the synthesis of PRA independent of PurF are present in Salmonella enterica. Here, we describe mutant alleles of the essential prsA gene, which encodes PRPP synthetase (E.C. 2.7.6.1), that allow PurF-independent thiamine synthesis. The mutant alleles resulted in reduced PrsA activity in extracts, caused nutritional requirements indicative of PRPP limitation and allowed non-enzymic formation of PRA due to a build-up of ribose 5-phosphate (R5P). These results emphasize the balance that must be reached between pathways competing for the same substrate to maintain robustness of the metabolic network.
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Affiliation(s)
- Mark J Koenigsknecht
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Luke A Fenlon
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Diana M Downs
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA
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16
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Koenigsknecht MJ, Ramos I, Downs DM. Glutamine Phosphoribosylpyrophosphate Amidotransferase-independent Phosphoribosyl Amine Synthesis from Ribose 5-Phosphate and Glutamine or Asparagine. J Biol Chem 2007; 282:28379-28384. [PMID: 17686772 DOI: 10.1074/jbc.m704024200] [Citation(s) in RCA: 8] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Phosphoribosylamine (PRA) is the first intermediate in the common pathway to purines and thiamine and is generated in bacteria by glutamine phosphoribosylpyrophosphate (PRPP) amidotransferase (EC 2.4.2.14) from PRPP and glutamine. Genetic data have indicated that multiple, non-PRPP amidotransferase mechanisms exist to generate PRA sufficient for thiamine but not purine synthesis. Here we describe the purification and identification of an activity (present in both Escherichia coli and Salmonella enterica) that synthesizes PRA from ribose 5-phosphate and glutamine/asparagine. A purification resulting in greater than a 625-fold increase in specific activity identified 8 candidate proteins. Of the candidates, overexpression of AphA (EC 3.1.3.2), a periplasmic class B nonspecific acid phosphatase, significantly increased activity in partially purified extracts. Native purification of AphA to >95% homogeneity determined that the periplasmic l-asparaginase II, AnsB (EC 3.5.1.1), co-purified with AphA and was also necessary for PRA formation. The potential physiological relevance of AphA and AnsB in contributing to thiamine biosynthesis in vivo is discussed.
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Affiliation(s)
| | - Itzel Ramos
- Department of Bacteriology, University of Wisconsin, Madison, Wisconsin 53706
| | - Diana M Downs
- Department of Bacteriology, University of Wisconsin, Madison, Wisconsin 53706.
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