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Leal F, Zeiringer S, Jeitler R, Costa PF, Roblegg E. A comprehensive overview of advanced dynamic in vitro intestinal and hepatic cell culture models. Tissue Barriers 2024; 12:2163820. [PMID: 36680530 PMCID: PMC10832944 DOI: 10.1080/21688370.2022.2163820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 12/22/2022] [Indexed: 01/22/2023] Open
Abstract
Orally administered drugs pass through the gastrointestinal tract before being absorbed in the small intestine and metabolised in the liver. To test the efficacy and toxicity of drugs, animal models are often employed; however, they are not suitable for investigating drug-tissue interactions and making reliable predictions, since the human organism differs drastically from animals in terms of absorption, distribution, metabolism and excretion of substances. Likewise, simple static in vitro cell culture systems currently used in preclinical drug screening often do not resemble the native characteristics of biological barriers. Dynamic models, on the other hand, provide in vivo-like cell phenotypes and functionalities that offer great potential for safety and efficacy prediction. Herein, current microfluidic in vitro intestinal and hepatic models are reviewed, namely single- and multi-tissue micro-bioreactors, which are associated with different methods of cell cultivation, i.e., scaffold-based versus scaffold-free.
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Affiliation(s)
- Filipa Leal
- BIOFABICS, Rua Alfredo Allen 455, 4200-135 Porto, Portugal
| | - Scarlett Zeiringer
- Department of Pharmaceutical Technology and Biopharmacy, University of Graz, Institute of Pharmaceutical Sciences, Universitaetsplatz 1, Graz, Austria
| | - Ramona Jeitler
- Department of Pharmaceutical Technology and Biopharmacy, University of Graz, Institute of Pharmaceutical Sciences, Universitaetsplatz 1, Graz, Austria
| | - Pedro F. Costa
- BIOFABICS, Rua Alfredo Allen 455, 4200-135 Porto, Portugal
| | - Eva Roblegg
- Department of Pharmaceutical Technology and Biopharmacy, University of Graz, Institute of Pharmaceutical Sciences, Universitaetsplatz 1, Graz, Austria
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2
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Yang J, Barrila J, Nauman EA, Nydam SD, Yang S, Park J, Gutierrez-Jensen AD, Castro CL, Ott CM, Buss K, Steel J, Zakrajsek AD, Schuff MM, Nickerson CA. Incremental increases in physiological fluid shear progressively alter pathogenic phenotypes and gene expression in multidrug resistant Salmonella. Gut Microbes 2024; 16:2357767. [PMID: 38783686 PMCID: PMC11135960 DOI: 10.1080/19490976.2024.2357767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 05/15/2024] [Indexed: 05/25/2024] Open
Abstract
The ability of bacteria to sense and respond to mechanical forces has important implications for pathogens during infection, as they experience wide fluid shear fluctuations in the host. However, little is known about how mechanical forces encountered in the infected host drive microbial pathogenesis. Herein, we combined mathematical modeling with hydrodynamic bacterial culture to profile transcriptomic and pathogenesis-related phenotypes of multidrug resistant S. Typhimurium (ST313 D23580) under different fluid shear conditions relevant to its transition from the intestinal tract to the bloodstream. We report that D23580 exhibited incremental changes in transcriptomic profiles that correlated with its pathogenic phenotypes in response to these progressive increases in fluid shear. This is the first demonstration that incremental changes in fluid shear forces alter stress responses and gene expression in any ST313 strain and offers mechanistic insight into how forces encountered by bacteria during infection might impact their disease-causing ability in unexpected ways.
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Affiliation(s)
- Jiseon Yang
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, USA
- Biodesign Center for Immunotherapy, Vaccines and Virotherapy, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Jennifer Barrila
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, USA
- Biodesign Center for Immunotherapy, Vaccines and Virotherapy, Arizona State University, Tempe, AZ, USA
| | - Eric A. Nauman
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH, USA
| | - Seth D. Nydam
- Department of Animal Care & Technologies, Arizona State University, Tempe, AZ, USA
| | - Shanshan Yang
- Bioinformatics Core Facility, Bioscience, Knowledge Enterprise, Arizona State University, Tempe, AZ, USA
| | - Jin Park
- Biodesign Center for Personalized Diagnostics, Arizona State University, Tempe, AZ, USA
| | - Ami D. Gutierrez-Jensen
- Biodesign Center for Immunotherapy, Vaccines and Virotherapy, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Christian L. Castro
- Biodesign Center for Immunotherapy, Vaccines and Virotherapy, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
- JES Tech, Houston, TX, USA
| | - C. Mark Ott
- Biomedical Research and Environmental Sciences Division, NASA Johnson Space Center, Houston, TX, USA
| | - Kristina Buss
- Bioinformatics Core Facility, Bioscience, Knowledge Enterprise, Arizona State University, Tempe, AZ, USA
- Biodesign Center for Personalized Diagnostics, Arizona State University, Tempe, AZ, USA
| | - Jason Steel
- Bioinformatics Core Facility, Bioscience, Knowledge Enterprise, Arizona State University, Tempe, AZ, USA
- Biodesign Center for Personalized Diagnostics, Arizona State University, Tempe, AZ, USA
| | - Anne D. Zakrajsek
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH, USA
| | - Mary M. Schuff
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH, USA
| | - Cheryl A. Nickerson
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, USA
- Biodesign Center for Immunotherapy, Vaccines and Virotherapy, Arizona State University, Tempe, AZ, USA
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
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3
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Ren Z, Harriot AD, Mair DB, Chung MK, Lee PHU, Kim DH. Biomanufacturing of 3D Tissue Constructs in Microgravity and their Applications in Human Pathophysiological Studies. Adv Healthc Mater 2023; 12:e2300157. [PMID: 37483106 DOI: 10.1002/adhm.202300157] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 06/27/2023] [Indexed: 07/25/2023]
Abstract
The growing interest in bioengineering in-vivo-like 3D functional tissues has led to novel approaches to the biomanufacturing process as well as expanded applications for these unique tissue constructs. Microgravity, as seen in spaceflight, is a unique environment that may be beneficial to the tissue-engineering process but cannot be completely replicated on Earth. Additionally, the expense and practical challenges of conducting human and animal research in space make bioengineered microphysiological systems an attractive research model. In this review, published research that exploits real and simulated microgravity to improve the biomanufacturing of a wide range of tissue types as well as those studies that use microphysiological systems, such as organ/tissue chips and multicellular organoids, for modeling human diseases in space are summarized. This review discusses real and simulated microgravity platforms and applications in tissue-engineered microphysiological systems across three topics: 1) application of microgravity to improve the biomanufacturing of tissue constructs, 2) use of tissue constructs fabricated in microgravity as models for human diseases on Earth, and 3) investigating the effects of microgravity on human tissues using biofabricated in vitro models. These current achievements represent important progress in understanding the physiological effects of microgravity and exploiting their advantages for tissue biomanufacturing.
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Affiliation(s)
- Zhanping Ren
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Anicca D Harriot
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Devin B Mair
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, USA
| | | | - Peter H U Lee
- Department of Pathology and Laboratory Medicine, Brown University, Providence, RI, 02912, USA
- Department of Cardiothoracic Surgery, Southcoast Health, Fall River, MA, 02720, USA
| | - Deok-Ho Kim
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, USA
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA
- Center for Microphysiological Systems, Johns Hopkins University, Baltimore, MD, 21205, USA
- Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, 21218, USA
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4
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Direct lysis of 3D cell cultures for RT-qPCR gene expression quantification. Sci Rep 2023; 13:1520. [PMID: 36707637 PMCID: PMC9883454 DOI: 10.1038/s41598-023-28844-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 01/25/2023] [Indexed: 01/28/2023] Open
Abstract
In vitro cell culture experiments are widely used to study cellular behavior in most biological research fields. Except for suspension cells, most human cell types are cultured as adherent monolayers on a plastic surface. While technically convenient, monolayer cultures can suffer from limitations in terms of physiological relevance, as their resemblance to complex in vivo tissue structures is limited. To address these limitations, three-dimensional (3D) cell culture systems have gained increased interest as they mimic key structural and functional properties of their in vivo tissue counterparts. Nevertheless, protocols established on monolayer cell cultures may require adjustments if they are to be applied to 3D cell cultures. As gene expression quantification is an essential part of many in vitro experiments, we evaluated and optimized a direct cell lysis, reverse transcription and qPCR protocol applicable for 3D cell cultures. The newly developed protocol wherein gene expression is determined directly from crude cell lysates showed improved cell lysis compared to the standard protocol, accurate gene expression quantification, hereby avoiding time-consuming cell harvesting and RNA extraction.
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5
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Rastall RA, Diez-Municio M, Forssten SD, Hamaker B, Meynier A, Moreno FJ, Respondek F, Stah B, Venema K, Wiese M. Structure and function of non-digestible carbohydrates in the gut microbiome. Benef Microbes 2022; 13:95-168. [PMID: 35729770 DOI: 10.3920/bm2021.0090] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Together with proteins and fats, carbohydrates are one of the macronutrients in the human diet. Digestible carbohydrates, such as starch, starch-based products, sucrose, lactose, glucose and some sugar alcohols and unusual (and fairly rare) α-linked glucans, directly provide us with energy while other carbohydrates including high molecular weight polysaccharides, mainly from plant cell walls, provide us with dietary fibre. Carbohydrates which are efficiently digested in the small intestine are not available in appreciable quantities to act as substrates for gut bacteria. Some oligo- and polysaccharides, many of which are also dietary fibres, are resistant to digestion in the small intestines and enter the colon where they provide substrates for the complex bacterial ecosystem that resides there. This review will focus on these non-digestible carbohydrates (NDC) and examine their impact on the gut microbiota and their physiological impact. Of particular focus will be the potential of non-digestible carbohydrates to act as prebiotics, but the review will also evaluate direct effects of NDC on human cells and systems.
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Affiliation(s)
- R A Rastall
- Department of Food and Nutritional Sciences, The University of Reading, P.O. Box 226, Whiteknights, Reading, RG6 6AP, United Kingdom
| | - M Diez-Municio
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Nicolás Cabrera 9, 28049 Madrid, Spain
| | - S D Forssten
- IFF Health & Biosciences, Sokeritehtaantie 20, 02460 Kantvik, Finland
| | - B Hamaker
- Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN 47907-2009, USA
| | - A Meynier
- Nutrition Research, Mondelez France R&D SAS, 6 rue René Razel, 91400 Saclay, France
| | - F Javier Moreno
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), CEI (UAM+CSIC), Nicolás Cabrera 9, 28049 Madrid, Spain
| | - F Respondek
- Tereos, Zoning Industriel Portuaire, 67390 Marckolsheim, France
| | - B Stah
- Human Milk Research & Analytical Science, Danone Nutricia Research, Uppsalalaan 12, 3584 CT Utrecht, the Netherlands.,Department of Chemical Biology & Drug Discovery, Utrecht Institute for Pharmaceutical Sciences, Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, the Netherlands
| | - K Venema
- Centre for Healthy Eating & Food Innovation (HEFI), Maastricht University - campus Venlo, St. Jansweg 20, 5928 RC Venlo, the Netherlands
| | - M Wiese
- Department of Microbiology and Systems Biology, TNO, Utrechtseweg 48, 3704 HE, Zeist, the Netherlands
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6
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Barrila J, Yang J, Franco Meléndez KP, Yang S, Buss K, Davis TJ, Aronow BJ, Bean HD, Davis RR, Forsyth RJ, Ott CM, Gangaraju S, Kang BY, Hanratty B, Nydam SD, Nauman EA, Kong W, Steel J, Nickerson CA. Spaceflight Analogue Culture Enhances the Host-Pathogen Interaction Between Salmonella and a 3-D Biomimetic Intestinal Co-Culture Model. Front Cell Infect Microbiol 2022; 12:705647. [PMID: 35711662 PMCID: PMC9195300 DOI: 10.3389/fcimb.2022.705647] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Abstract
Physical forces associated with spaceflight and spaceflight analogue culture regulate a wide range of physiological responses by both bacterial and mammalian cells that can impact infection. However, our mechanistic understanding of how these environments regulate host-pathogen interactions in humans is poorly understood. Using a spaceflight analogue low fluid shear culture system, we investigated the effect of Low Shear Modeled Microgravity (LSMMG) culture on the colonization of Salmonella Typhimurium in a 3-D biomimetic model of human colonic epithelium containing macrophages. RNA-seq profiling of stationary phase wild type and Δhfq mutant bacteria alone indicated that LSMMG culture induced global changes in gene expression in both strains and that the RNA binding protein Hfq played a significant role in regulating the transcriptional response of the pathogen to LSMMG culture. However, a core set of genes important for adhesion, invasion, and motility were commonly induced in both strains. LSMMG culture enhanced the colonization (adherence, invasion and intracellular survival) of Salmonella in this advanced model of intestinal epithelium using a mechanism that was independent of Hfq. Although S. Typhimurium Δhfq mutants are normally defective for invasion when grown as conventional shaking cultures, LSMMG conditions unexpectedly enabled high levels of colonization by an isogenic Δhfq mutant. In response to infection with either the wild type or mutant, host cells upregulated transcripts involved in inflammation, tissue remodeling, and wound healing during intracellular survival. Interestingly, infection by the Δhfq mutant led to fewer transcriptional differences between LSMMG- and control-infected host cells relative to infection with the wild type strain. This is the first study to investigate the effect of LSMMG culture on the interaction between S. Typhimurium and a 3-D model of human intestinal tissue. These findings advance our understanding of how physical forces can impact the early stages of human enteric salmonellosis.
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Affiliation(s)
- Jennifer Barrila
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
- *Correspondence: Jennifer Barrila, ; Cheryl A. Nickerson,
| | - Jiseon Yang
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
| | - Karla P. Franco Meléndez
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
- Genomics and Bioinformatics Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Gainesville, FL, United States
| | - Shanshan Yang
- Bioinformatics Core Facility, Bioscience, Knowledge Enterprise, Arizona State University, Tempe, AZ, United States
| | - Kristina Buss
- Bioinformatics Core Facility, Bioscience, Knowledge Enterprise, Arizona State University, Tempe, AZ, United States
| | - Trenton J. Davis
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Bruce J. Aronow
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States
| | - Heather D. Bean
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Richard R. Davis
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
| | - Rebecca J. Forsyth
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
| | - C. Mark Ott
- Biomedical Research and Environmental Sciences Division, NASA Johnson Space Center, Houston, TX, United States
| | - Sandhya Gangaraju
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
| | - Bianca Y. Kang
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
| | - Brian Hanratty
- Bioinformatics Core Facility, Bioscience, Knowledge Enterprise, Arizona State University, Tempe, AZ, United States
| | - Seth D. Nydam
- Department of Animal Care & Technologies, Arizona State University, Tempe, AZ, United States
| | - Eric A. Nauman
- School of Mechanical Engineering, Weldon School of Biomedical Engineering and Department of Basic Medical Sciences, Purdue University, West Lafayette, IN, United States
| | - Wei Kong
- Biodesign Center for Immunotherapy, Vaccines and Virotherapy, Arizona State University, Tempe, AZ, United States
| | - Jason Steel
- Bioinformatics Core Facility, Bioscience, Knowledge Enterprise, Arizona State University, Tempe, AZ, United States
| | - Cheryl A. Nickerson
- Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, Tempe, AZ, United States
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
- *Correspondence: Jennifer Barrila, ; Cheryl A. Nickerson,
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7
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Grzymajlo K. The Game for Three: Salmonella–Host–Microbiota Interaction Models. Front Microbiol 2022; 13:854112. [PMID: 35516427 PMCID: PMC9062650 DOI: 10.3389/fmicb.2022.854112] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 03/11/2022] [Indexed: 11/16/2022] Open
Abstract
Colonization of the gastrointestinal (GI) tract by enteric pathogens occurs in a context strongly determined by host-specific gut microbiota, which can significantly affect the outcome of infection. The complex gameplay between the trillions of microbes that inhabit the GI tract, the host, and the infecting pathogen defines a specific triangle of interaction; therefore, a complete model of infection should consider all of these elements. Many different infection models have been developed to explain the complexity of these interactions. This review sheds light on current knowledge, along with the strengths and limitations of in vitro and in vivo models utilized in the study of Salmonella–host–microbiome interactions. These models range from the simplest experiment simulating environmental conditions using dedicated growth media through in vitro interaction with cell lines and 3-D organoid structure, and sophisticated “gut on a chip” systems, ending in various animal models. Finally, the challenges facing this field of research and the important future directions are outlined.
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8
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Intestinal Organoids: New Tools to Comprehend the Virulence of Bacterial Foodborne Pathogens. Foods 2022; 11:foods11010108. [PMID: 35010234 PMCID: PMC8750402 DOI: 10.3390/foods11010108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/18/2021] [Accepted: 12/22/2021] [Indexed: 12/12/2022] Open
Abstract
Foodborne diseases cause high morbidity and mortality worldwide. Understanding the relationships between bacteria and epithelial cells throughout the infection process is essential to setting up preventive and therapeutic solutions. The extensive study of their pathophysiology has mostly been performed on transformed cell cultures that do not fully mirror the complex cell populations, the in vivo architectures, and the genetic profiles of native tissues. Following advances in primary cell culture techniques, organoids have been developed. Such technological breakthroughs have opened a new path in the study of microbial infectious diseases, and thus opened onto new strategies to control foodborne hazards. This review sheds new light on cellular messages from the host–foodborne pathogen crosstalk during in vitro organoid infection by the foodborne pathogenic bacteria with the highest health burden. Finally, future perspectives and current challenges are discussed to provide a better understanding of the potential applications of organoids in the investigation of foodborne infectious diseases.
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9
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Nickerson KP, Llanos-Chea A, Ingano L, Serena G, Miranda-Ribera A, Perlman M, Lima R, Sztein MB, Fasano A, Senger S, Faherty CS. A Versatile Human Intestinal Organoid-Derived Epithelial Monolayer Model for the Study of Enteric Pathogens. Microbiol Spectr 2021; 9:e0000321. [PMID: 34106568 PMCID: PMC8552518 DOI: 10.1128/spectrum.00003-21] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 04/20/2021] [Indexed: 01/09/2023] Open
Abstract
Gastrointestinal infections cause significant morbidity and mortality worldwide. The complexity of human biology and limited insights into host-specific infection mechanisms are key barriers to current therapeutic development. Here, we demonstrate that two-dimensional epithelial monolayers derived from human intestinal organoids, combined with in vivo-like bacterial culturing conditions, provide significant advancements for the study of enteropathogens. Monolayers from the terminal ileum, cecum, and ascending colon recapitulated the composition of the gastrointestinal epithelium, in which several techniques were used to detect the presence of enterocytes, mucus-producing goblet cells, and other cell types following differentiation. Importantly, the addition of receptor activator of nuclear factor kappa-B ligand (RANKL) increased the presence of M cells, critical antigen-sampling cells often exploited by enteric pathogens. For infections, bacteria were grown under in vivo-like conditions known to induce virulence. Overall, interesting patterns of tissue tropism and clinical manifestations were observed. Shigella flexneri adhered efficiently to the cecum and colon; however, invasion in the colon was best following RANKL treatment. Both Salmonella enterica serovars Typhi and Typhimurium displayed different infection patterns, with S. Typhimurium causing more destruction of the terminal ileum and S. Typhi infecting the cecum more efficiently than the ileum, particularly with regard to adherence. Finally, various pathovars of Escherichia coli validated the model by confirming only adherence was observed with these strains. This work demonstrates that the combination of human-derived tissue with targeted bacterial growth conditions enables powerful analyses of human-specific infections that could lead to important insights into pathogenesis and accelerate future vaccine development. IMPORTANCE While traditional laboratory techniques and animal models have provided valuable knowledge in discerning virulence mechanisms of enteric pathogens, the complexity of the human gastrointestinal tract has hindered our understanding of physiologically relevant, human-specific interactions; and thus, has significantly delayed successful vaccine development. The human intestinal organoid-derived epithelial monolayer (HIODEM) model closely recapitulates the diverse cell populations of the intestine, allowing for the study of human-specific infections. Differentiation conditions permit the expansion of various cell populations, including M cells that are vital to immune recognition and the establishment of infection by some bacteria. We provide details of reproducible culture methods and infection conditions for the analyses of Shigella, Salmonella, and pathogenic Escherichia coli in which tissue tropism and pathogen-specific infection patterns were detected. This system will be vital for future studies that explore infection conditions, health status, or epigenetic differences and will serve as a novel screening platform for therapeutic development.
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Affiliation(s)
- Kourtney P. Nickerson
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Alejandro Llanos-Chea
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Laura Ingano
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Gloria Serena
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Alba Miranda-Ribera
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Meryl Perlman
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Rosiane Lima
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Marcelo B. Sztein
- Center for Vaccine Development and Global Health, Department of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Alessio Fasano
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Stefania Senger
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Christina S. Faherty
- Mucosal Immunology and Biology Research Center, Division of Pediatric Gastroenterology and Nutrition, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
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10
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Kunjapur AM, Napolitano MG, Hysolli E, Noguera K, Appleton EM, Schubert MG, Jones MA, Iyer S, Mandell DJ, Church GM. Synthetic auxotrophy remains stable after continuous evolution and in coculture with mammalian cells. SCIENCE ADVANCES 2021; 7:eabf5851. [PMID: 34215581 PMCID: PMC11060021 DOI: 10.1126/sciadv.abf5851] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 05/18/2021] [Indexed: 06/13/2023]
Abstract
Understanding the evolutionary stability and possible context dependence of biological containment techniques is critical as engineered microbes are increasingly under consideration for applications beyond biomanufacturing. While synthetic auxotrophy previously prevented Escherichia coli from exhibiting detectable escape from batch cultures, its long-term effectiveness is unknown. Here, we report automated continuous evolution of a synthetic auxotroph while supplying a decreasing concentration of essential biphenylalanine (BipA). After 100 days of evolution, triplicate populations exhibit no observable escape and exhibit normal growth rates at 10-fold lower BipA concentration than the ancestral synthetic auxotroph. Allelic reconstruction reveals the contribution of three genes to increased fitness at low BipA concentrations. Based on its evolutionary stability, we introduce the progenitor strain directly to mammalian cell culture and observe containment of bacteria without detrimental effects on HEK293T cells. Overall, our findings reveal that synthetic auxotrophy is effective on time scales and in contexts that enable diverse applications.
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Affiliation(s)
- Aditya M Kunjapur
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA.
- Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy Street, CLB 215, Newark, DE 19716, USA
| | - Michael G Napolitano
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA
| | - Eriona Hysolli
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA
| | - Karen Noguera
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA
| | - Evan M Appleton
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA
| | - Max G Schubert
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA
| | - Michaela A Jones
- Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy Street, CLB 215, Newark, DE 19716, USA
| | - Siddharth Iyer
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA
| | - Daniel J Mandell
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA
| | - George M Church
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, NRB 238, Boston, MA 02115, USA.
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11
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Evaluating the effect of spaceflight on the host-pathogen interaction between human intestinal epithelial cells and Salmonella Typhimurium. NPJ Microgravity 2021; 7:9. [PMID: 33750813 PMCID: PMC7943786 DOI: 10.1038/s41526-021-00136-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 02/03/2021] [Indexed: 01/31/2023] Open
Abstract
Spaceflight uniquely alters the physiology of both human cells and microbial pathogens, stimulating cellular and molecular changes directly relevant to infectious disease. However, the influence of this environment on host-pathogen interactions remains poorly understood. Here we report our results from the STL-IMMUNE study flown aboard Space Shuttle mission STS-131, which investigated multi-omic responses (transcriptomic, proteomic) of human intestinal epithelial cells to infection with Salmonella Typhimurium when both host and pathogen were simultaneously exposed to spaceflight. To our knowledge, this was the first in-flight infection and dual RNA-seq analysis using human cells.
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12
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Advanced 3D Cell Culture Techniques in Micro-Bioreactors, Part II: Systems and Applications. Processes (Basel) 2020. [DOI: 10.3390/pr9010021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In this second part of our systematic review on the research area of 3D cell culture in micro-bioreactors we give a detailed description of the published work with regard to the existing micro-bioreactor types and their applications, and highlight important results gathered with the respective systems. As an interesting detail, we found that micro-bioreactors have already been used in SARS-CoV research prior to the SARS-CoV2 pandemic. As our literature research revealed a variety of 3D cell culture configurations in the examined bioreactor systems, we defined in review part one “complexity levels” by means of the corresponding 3D cell culture techniques applied in the systems. The definition of the complexity is thereby based on the knowledge that the spatial distribution of cell-extracellular matrix interactions and the spatial distribution of homologous and heterologous cell–cell contacts play an important role in modulating cell functions. Because at least one of these parameters can be assigned to the 3D cell culture techniques discussed in the present review, we structured the studies according to the complexity levels applied in the MBR systems.
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13
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Advanced 3D Cell Culture Techniques in Micro-Bioreactors, Part I: A Systematic Analysis of the Literature Published between 2000 and 2020. Processes (Basel) 2020. [DOI: 10.3390/pr8121656] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Bioreactors have proven useful for a vast amount of applications. Besides classical large-scale bioreactors and fermenters for prokaryotic and eukaryotic organisms, micro-bioreactors, as specialized bioreactor systems, have become an invaluable tool for mammalian 3D cell cultures. In this systematic review we analyze the literature in the field of eukaryotic 3D cell culture in micro-bioreactors within the last 20 years. For this, we define complexity levels with regard to the cellular 3D microenvironment concerning cell–matrix-contact, cell–cell-contact and the number of different cell types present at the same time. Moreover, we examine the data with regard to the micro-bioreactor design including mode of cell stimulation/nutrient supply and materials used for the micro-bioreactors, the corresponding 3D cell culture techniques and the related cellular microenvironment, the cell types and in vitro models used. As a data source we used the National Library of Medicine and analyzed the studies published from 2000 to 2020.
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14
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Jackson R, Maarsingh J, Herbst-Kralovetz MM, Van Doorslaer K. 3D Oral and Cervical Tissue Models for Studying Papillomavirus Host-Pathogen Interactions. CURRENT PROTOCOLS IN MICROBIOLOGY 2020; 59:e129. [PMID: 33232584 PMCID: PMC11088941 DOI: 10.1002/cpmc.129] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Human papillomavirus (HPV) infection occurs in differentiating epithelial tissues. Cancers caused by high-risk types (e.g., HPV16 and HPV18) typically occur at oropharyngeal and anogenital anatomical sites. The HPV life cycle is differentiation-dependent, requiring tissue culture methodology that is able to recapitulate the three-dimensional (3D) stratified epithelium. Here we report two distinct and complementary methods for growing differentiating epithelial tissues that mimic many critical morphological and biochemical aspects of in vivo tissue. The first approach involves growing primary human epithelial cells on top of a dermal equivalent consisting of collagen fibers and living fibroblast cells. When these cells are grown at the liquid-air interface, differentiation occurs and allows for epithelial stratification. The second approach uses a rotating wall vessel bioreactor. The low-fluid-shear microgravity environment inside the bioreactor allows the cells to use collagen-coated microbeads as a growth scaffold and self-assemble into 3D cellular aggregates. These approaches are applied to epithelial cells derived from HPV-positive and HPV-negative oral and cervical tissues. The second part of the article introduces potential downstream applications for these 3D tissue models. We describe methods that will allow readers to start successfully culturing 3D tissues from oral and cervical cells. These tissues have been used for microscopic visualization, scanning electron microscopy, and large omics-based studies to gain insights into epithelial biology, the HPV life cycle, and host-pathogen interactions. © 2020 Wiley Periodicals LLC. Basic Protocol 1: Establishing human primary cell-derived 3D organotypic raft cultures Support Protocol 1: Isolation of epithelial cells from patient-derived tissues Support Protocol 2: Growth and maintenance of primary human epithelial cells in monolayer culture Support Protocol 3: PCR-based HPV screening of primary cell cultures Basic Protocol 2: Establishing human 3D cervical tissues using the rotating wall vessel bioreactor Support Protocol 4: Growth and maintenance of human A2EN cells in monolayer culture Support Protocol 5: Preparation of the slow-turning lateral vessel bioreactor Support Protocol 6: Preparation of Cytodex-3 microcarrier beads Basic Protocol 3: Histological assessment of 3D organotypic raft tissues Basic Protocol 4: Spatial analysis of protein expression in 3D organotypic raft cultures Basic Protocol 5: Immunofluorescence imaging of RWV-derived 3D tissues Basic Protocol 6: Ultrastructural visualization and imaging of RWV-derived 3D tissues Basic Protocol 7: Characterization of gene expression by RT-qPCR.
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Affiliation(s)
- Robert Jackson
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA 85721
| | - Jason Maarsingh
- Department of Obstetrics and Gynecology, University of Arizona, College of Medicine-Phoenix, Phoenix, AZ, USA 85004
| | - Melissa M. Herbst-Kralovetz
- Department of Obstetrics and Gynecology, University of Arizona, College of Medicine-Phoenix, Phoenix, AZ, USA 85004
- Department of Basic Medical Sciences; BIO5 Institute; Clinical Translational Sciences Graduate Program; University of Arizona Cancer Center, University of Arizona, College of Medicine-Phoenix, Phoenix, AZ, USA 85004
| | - Koenraad Van Doorslaer
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA 85721
- Department of Immunobiology; BIO5 Institute; Cancer Biology Graduate Interdisciplinary Program; Genetics Graduate Interdisciplinary Program; and University of Arizona Cancer Center, University of Arizona, Tucson, AZ, USA 85721
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15
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Ashammakhi N, Nasiri R, Barros NRD, Tebon P, Thakor J, Goudie M, Shamloo A, Martin MG, Khademhosseini A. Gut-on-a-chip: Current progress and future opportunities. Biomaterials 2020; 255:120196. [PMID: 32623181 PMCID: PMC7396314 DOI: 10.1016/j.biomaterials.2020.120196] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 04/11/2020] [Accepted: 06/09/2020] [Indexed: 12/21/2022]
Abstract
Organ-on-a-chip technology tries to mimic the complexity of native tissues in vitro. Important progress has recently been made in using this technology to study the gut with and without microbiota. These in vitro models can serve as an alternative to animal models for studying physiology, pathology, and pharmacology. While these models have greater physiological relevance than two-dimensional (2D) cell systems in vitro, endocrine and immunological functions in gut-on-a-chip models are still poorly represented. Furthermore, the construction of complex models, in which different cell types and structures interact, remains a challenge. Generally, gut-on-a-chip models have the potential to advance our understanding of the basic interactions found within the gut and lay the foundation for future applications in understanding pathophysiology, developing drugs, and personalizing medical treatments.
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Affiliation(s)
- Nureddin Ashammakhi
- Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA.
| | - Rohollah Nasiri
- Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA; Department of Mechanical Engineering, Sharif University of Technology, Tehran 11365-11155, Iran
| | - Natan Roberto de Barros
- Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA.
| | - Peyton Tebon
- Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA
| | - Jai Thakor
- Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA
| | - Marcus Goudie
- Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA
| | - Amir Shamloo
- Department of Mechanical Engineering, Sharif University of Technology, Tehran 11365-11155, Iran
| | - Martin G Martin
- Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Ali Khademhosseini
- Center for Minimally Invasive Therapeutics (C-MIT), University of California, Los Angeles, CA, USA; Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, CA, USA; Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA; Department of Chemical and Biomolecular Engineering, Samueli School of Engineering, University of California, Los Angeles, CA, USA; Terasaki Institute for Biomedical Innovation, Los Angeles, CA, USA.
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16
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Mohebali N, Ekat K, Kreikemeyer B, Breitrück A. Barrier Protection and Recovery Effects of Gut Commensal Bacteria on Differentiated Intestinal Epithelial Cells In Vitro. Nutrients 2020; 12:nu12082251. [PMID: 32731411 PMCID: PMC7468801 DOI: 10.3390/nu12082251] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/21/2020] [Accepted: 07/22/2020] [Indexed: 02/07/2023] Open
Abstract
Alterations in the gut microbiota composition play a crucial role in the pathogenesis of inflammatory bowel disease (IBD) as specific commensal bacterial species are underrepresented in the microbiota of IBD patients. In this study, we examined the therapeutic potential of three commensal bacterial species, Faecalibacterium prausnitzii (F. prausnitzii), Roseburia intestinalis (R. intestinalis) and Bacteroides faecis (B. faecis) in an in vitro model of intestinal inflammation, by using differentiated Caco-2 and HT29-MTX cells, stimulated with a pro-inflammatory cocktail consisting of interleukin-1β (IL-1β), tumor necrosis factor-α (TNFα), interferon-γ (IFNγ), and lipopolysaccharide (LPS). Results obtained in this work demonstrated that all three bacterial species are able to recover the impairment of the epithelial barrier function induced by the inflammatory stimulus, as determined by an amelioration of the transepithelial electrical resistance (TEER) and the paracellular permeability of the cell monolayer. Moreover, inflammatory stimulus increased claudin-2 expression and decreased occludin expression were improved in the cells treated with commensal bacteria. Furthermore, the commensals were able to counteract the increased release of interleukin-8 (IL-8) and monocyte chemoattractant protein-1 (MCP-1) induced by the inflammatory stimulus. These findings indicated that F. prausnitzii, R. intestinalis and B. faecis improve the epithelial barrier integrity and limit inflammatory responses.
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17
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Alzheimer M, Svensson SL, König F, Schweinlin M, Metzger M, Walles H, Sharma CM. A three-dimensional intestinal tissue model reveals factors and small regulatory RNAs important for colonization with Campylobacter jejuni. PLoS Pathog 2020; 16:e1008304. [PMID: 32069333 PMCID: PMC7048300 DOI: 10.1371/journal.ppat.1008304] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 02/28/2020] [Accepted: 01/02/2020] [Indexed: 02/06/2023] Open
Abstract
The Gram-negative Epsilonproteobacterium Campylobacter jejuni is currently the most prevalent bacterial foodborne pathogen. Like for many other human pathogens, infection studies with C. jejuni mainly employ artificial animal or cell culture models that can be limited in their ability to reflect the in-vivo environment within the human host. Here, we report the development and application of a human three-dimensional (3D) infection model based on tissue engineering to study host-pathogen interactions. Our intestinal 3D tissue model is built on a decellularized extracellular matrix scaffold, which is reseeded with human Caco-2 cells. Dynamic culture conditions enable the formation of a polarized mucosal epithelial barrier reminiscent of the 3D microarchitecture of the human small intestine. Infection with C. jejuni demonstrates that the 3D tissue model can reveal isolate-dependent colonization and barrier disruption phenotypes accompanied by perturbed localization of cell-cell junctions. Pathogenesis-related phenotypes of C. jejuni mutant strains in the 3D model deviated from those obtained with 2D-monolayers, but recapitulated phenotypes previously observed in animal models. Moreover, we demonstrate the involvement of a small regulatory RNA pair, CJnc180/190, during infections and observe different phenotypes of CJnc180/190 mutant strains in 2D vs. 3D infection models. Hereby, the CJnc190 sRNA exerts its pathogenic influence, at least in part, via repression of PtmG, which is involved in flagellin modification. Our results suggest that the Caco-2 cell-based 3D tissue model is a valuable and biologically relevant tool between in-vitro and in-vivo infection models to study virulence of C. jejuni and other gastrointestinal pathogens. Enteric pathogens have evolved numerous strategies to successfully colonize and persist in the human gastrointestinal tract. However, especially for the research of virulence mechanisms of human pathogens, often only limited infection models are available. Here, we have applied and further advanced a tissue-engineered human intestinal tissue model based on an extracellular matrix scaffold reseeded with human cells that can faithfully mimic pathogenesis-determining processes of the zoonotic pathogen Campylobacter jejuni. Our three-dimensional (3D) intestinal infection model allows for the assessment of epithelial barrier function during infection as well as for the quantification of bacterial adherence, internalization, and transmigration. Investigation of C. jejuni mutant strains in our 3D tissue model revealed isolate-specific infection phenotypes, in-vivo relevant infection outcomes, and uncovered the involvement of a small RNA pair during C. jejuni pathogenesis. Overall, our results demonstrate the power of tissue-engineered models for studying host-pathogen interactions, and our model will also be helpful to investigate other gastrointestinal pathogens.
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Affiliation(s)
- Mona Alzheimer
- Chair of Molecular Infection Biology II, Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
| | - Sarah L. Svensson
- Chair of Molecular Infection Biology II, Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
| | - Fabian König
- Chair of Molecular Infection Biology II, Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
| | - Matthias Schweinlin
- Department of Tissue Engineering and Regenerative Medicine, University Hospital Würzburg, Würzburg, Germany
| | - Marco Metzger
- Department of Tissue Engineering and Regenerative Medicine, University Hospital Würzburg, Würzburg, Germany
- Fraunhofer-Institute for Silicate Research, Translational Centre Regenerative Therapies, Würzburg, Germany
| | - Heike Walles
- Department of Tissue Engineering and Regenerative Medicine, University Hospital Würzburg, Würzburg, Germany
- Core Facility Tissue Engineering, Otto-von-Guericke University, Magdeburg, Germany
- * E-mail: (HW); (CMS)
| | - Cynthia M. Sharma
- Chair of Molecular Infection Biology II, Institute of Molecular Infection Biology, University of Würzburg, Würzburg, Germany
- * E-mail: (HW); (CMS)
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18
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A Simulated Microgravity Environment Causes a Sustained Defect in Epithelial Barrier Function. Sci Rep 2019; 9:17531. [PMID: 31772208 PMCID: PMC6879622 DOI: 10.1038/s41598-019-53862-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 10/31/2019] [Indexed: 02/06/2023] Open
Abstract
Intestinal epithelial cell (IEC) junctions constitute a robust barrier to invasion by viruses, bacteria and exposure to ingested agents. Previous studies showed that microgravity compromises the human immune system and increases enteropathogen virulence. However, the effects of microgravity on epithelial barrier function are poorly understood. The aims of this study were to identify if simulated microgravity alters intestinal epithelial barrier function (permeability), and susceptibility to barrier-disrupting agents. IECs (HT-29.cl19a) were cultured on microcarrier beads in simulated microgravity using a rotating wall vessel (RWV) for 18 days prior to seeding on semipermeable supports to measure ion flux (transepithelial electrical resistance (TER)) and FITC-dextran (FD4) permeability over 14 days. RWV cells showed delayed apical junction localization of the tight junction proteins, occludin and ZO-1. The alcohol metabolite, acetaldehyde, significantly decreased TER and reduced junctional ZO-1 localization, while increasing FD4 permeability in RWV cells compared with static, motion and flask control cells. In conclusion, simulated microgravity induced an underlying and sustained susceptibility to epithelial barrier disruption upon removal from the microgravity environment. This has implications for gastrointestinal homeostasis of astronauts in space, as well as their capability to withstand the effects of agents that compromise intestinal epithelial barrier function following return to Earth.
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19
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Modeling Host-Pathogen Interactions in the Context of the Microenvironment: Three-Dimensional Cell Culture Comes of Age. Infect Immun 2018; 86:IAI.00282-18. [PMID: 30181350 DOI: 10.1128/iai.00282-18] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Tissues and organs provide the structural and biochemical landscapes upon which microbial pathogens and commensals function to regulate health and disease. While flat two-dimensional (2-D) monolayers composed of a single cell type have provided important insight into understanding host-pathogen interactions and infectious disease mechanisms, these reductionist models lack many essential features present in the native host microenvironment that are known to regulate infection, including three-dimensional (3-D) architecture, multicellular complexity, commensal microbiota, gas exchange and nutrient gradients, and physiologically relevant biomechanical forces (e.g., fluid shear, stretch, compression). A major challenge in tissue engineering for infectious disease research is recreating this dynamic 3-D microenvironment (biological, chemical, and physical/mechanical) to more accurately model the initiation and progression of host-pathogen interactions in the laboratory. Here we review selected 3-D models of human intestinal mucosa, which represent a major portal of entry for infectious pathogens and an important niche for commensal microbiota. We highlight seminal studies that have used these models to interrogate host-pathogen interactions and infectious disease mechanisms, and we present this literature in the appropriate historical context. Models discussed include 3-D organotypic cultures engineered in the rotating wall vessel (RWV) bioreactor, extracellular matrix (ECM)-embedded/organoid models, and organ-on-a-chip (OAC) models. Collectively, these technologies provide a more physiologically relevant and predictive framework for investigating infectious disease mechanisms and antimicrobial therapies at the intersection of the host, microbe, and their local microenvironments.
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20
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Yesil-Celiktas O, Hassan S, Miri AK, Maharjan S, Al-kharboosh R, Quiñones-Hinojosa A, Zhang YS. Mimicking Human Pathophysiology in Organ-on-Chip Devices. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/adbi.201800109] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ozlem Yesil-Celiktas
- Division of Engineering in Medicine; Department of Medicine; Brigham and Women's Hospital; Harvard Medical School; Cambridge MA 02139 USA
- Department of Bioengineering; Faculty of Engineering; Ege University; Bornova-Izmir 35100 Turkey
| | - Shabir Hassan
- Division of Engineering in Medicine; Department of Medicine; Brigham and Women's Hospital; Harvard Medical School; Cambridge MA 02139 USA
| | - Amir K. Miri
- Division of Engineering in Medicine; Department of Medicine; Brigham and Women's Hospital; Harvard Medical School; Cambridge MA 02139 USA
- Department of Mechanical Engineering Rowan University; 401 North Campus Drive Glassboro NJ 08028 USA
| | - Sushila Maharjan
- Division of Engineering in Medicine; Department of Medicine; Brigham and Women's Hospital; Harvard Medical School; Cambridge MA 02139 USA
- Research Institute for Bioscience and Biotechnology; Nakkhu-4 Lalitpur 44600 Nepal
| | - Rawan Al-kharboosh
- Mayo Clinic College of Medicine; Mayo Clinic Graduate School; Neuroscience, NBD Track Rochester MN 55905 USA
- Department of Neurosurgery, Oncology, Neuroscience; Mayo Clinic; Jacksonville FL 32224 USA
| | | | - Yu Shrike Zhang
- Division of Engineering in Medicine; Department of Medicine; Brigham and Women's Hospital; Harvard Medical School; Cambridge MA 02139 USA
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21
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Paul W, Marta C, Tom VDW. Resolving host–microbe interactions in the gut: the promise of in vitro models to complement in vivo research. Curr Opin Microbiol 2018; 44:28-33. [DOI: 10.1016/j.mib.2018.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 06/26/2018] [Accepted: 07/03/2018] [Indexed: 12/17/2022]
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22
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Nickerson KP, Senger S, Zhang Y, Lima R, Patel S, Ingano L, Flavahan WA, Kumar DKV, Fraser CM, Faherty CS, Sztein MB, Fiorentino M, Fasano A. Salmonella Typhi Colonization Provokes Extensive Transcriptional Changes Aimed at Evading Host Mucosal Immune Defense During Early Infection of Human Intestinal Tissue. EBioMedicine 2018; 31:92-109. [PMID: 29735417 PMCID: PMC6013756 DOI: 10.1016/j.ebiom.2018.04.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 04/02/2018] [Accepted: 04/05/2018] [Indexed: 12/29/2022] Open
Abstract
Commensal microorganisms influence a variety of host functions in the gut, including immune response, glucose homeostasis, metabolic pathways and oxidative stress, among others. This study describes how Salmonella Typhi, the pathogen responsible for typhoid fever, uses similar strategies to escape immune defense responses and survive within its human host. To elucidate the early mechanisms of typhoid fever, we performed studies using healthy human intestinal tissue samples and "mini-guts," organoids grown from intestinal tissue taken from biopsy specimens. We analyzed gene expression changes in human intestinal specimens and bacterial cells both separately and after colonization. Our results showed mechanistic strategies that S. Typhi uses to rearrange the cellular machinery of the host cytoskeleton to successfully invade the intestinal epithelium, promote polarized cytokine release and evade immune system activation by downregulating genes involved in antigen sampling and presentation during infection. This work adds novel information regarding S. Typhi infection pathogenesis in humans, by replicating work shown in traditional cell models, and providing new data that can be applied to future vaccine development strategies.
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Affiliation(s)
- K P Nickerson
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States; Department of Pediatrics, Harvard Medical School, Harvard University, Boston, MA, United States.
| | - S Senger
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States; Department of Pediatrics, Harvard Medical School, Harvard University, Boston, MA, United States
| | - Y Zhang
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - R Lima
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States
| | - S Patel
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States
| | - L Ingano
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States
| | - W A Flavahan
- Department of Pathology, Massachusetts General Hospital, Boston, MA, United States
| | - D K V Kumar
- Department for the Neuroscience of Genetics and Aging, Massachusetts General Hospital, Boston, MA, United States
| | - C M Fraser
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - C S Faherty
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States; Department of Pediatrics, Harvard Medical School, Harvard University, Boston, MA, United States
| | - M B Sztein
- Center for Vaccine Development, Department of Pediatrics, University of Maryland, Baltimore, MD, United States
| | - M Fiorentino
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States; Department of Pediatrics, Harvard Medical School, Harvard University, Boston, MA, United States
| | - A Fasano
- Department of Pediatric Gastroenterology, Mucosal Immunology and Biology Research Center, Massachusetts General Hospital, Boston, MA, United States; Department of Pediatrics, Harvard Medical School, Harvard University, Boston, MA, United States.
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23
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Yin Y, Zhou D. Organoid and Enteroid Modeling of Salmonella Infection. Front Cell Infect Microbiol 2018; 8:102. [PMID: 29670862 PMCID: PMC5894114 DOI: 10.3389/fcimb.2018.00102] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 03/16/2018] [Indexed: 12/12/2022] Open
Abstract
Salmonella are Gram-negative rod-shaped facultative anaerobic bacteria that are comprised of over 2,000 serovars. They cause gastroenteritis (salmonellosis) with headache, abdominal pain and diarrhea clinical symptoms. Salmonellosis brings a heavy burden for the public health in both developing and developed countries. Antibiotics are usually effective in treating the infected patients with severe gastroenteritis, although antibiotic resistance is on the rise. Understanding the molecular mechanisms of Salmonella infection is vital to combat the disease. In vitro immortalized 2-D cell lines, ex vivo tissues/organs and several animal models have been successfully utilized to study Salmonella infections. Although these infection models have contributed to uncovering the molecular virulence mechanisms, some intrinsic shortcomings have limited their wider applications. Notably, cell lines only contain a single cell type, which cannot reproduce some of the hallmarks of natural infections. While ex vivo tissues/organs alleviate some of these concerns, they are more difficult to maintain, in particular for long term experiments. In addition, non-human animal models are known to reflect only part of the human disease process. Enteroids and induced intestinal organoids are emerging as effective infection models due to their closeness in mimicking the infected tissues/organs. Induced intestinal organoids are derived from iPSCs and contain mesenchymal cells whereas enteroids are derive from intestinal stem cells and are comprised of epithelial cells only. Both enteroids and induced intestinal organoids mimic the villus and crypt domains comparable to the architectures of the in vivo intestine. We review here that enteroids and induced intestinal organoids are emerging as desired infection models to study bacterial-host interactions of Salmonella.
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Affiliation(s)
- Yuebang Yin
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, Netherlands
| | - Daoguo Zhou
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China.,Department of Biological Sciences, Purdue University, West Lafayette, IN, United States
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24
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Abstract
The human gut microbiome performs prodigious physiological functions such as production of microbial metabolites, modulation of nutrient digestion and drug metabolism, control of immune system, and prevention of infection. Paradoxically, gut microbiome can also negatively orchestrate the host responses in diseases or chronic disorders, suggesting that the regulated and balanced host-gut microbiome crosstalk is a salient prerequisite in gastrointestinal physiology. To understand the pathophysiological role of host-microbiome crosstalk, it is critical to recreate in vivo relevant models of the host-gut microbiome ecosystem in human. However, controlling the multi-species microbial communities and their uncontrolled growth has remained a notable technical challenge. Furthermore, conventional two-dimensional (2D) or 3D culture systems do not recapitulate multicellular microarchitectures, mechanical dynamics, and tissue-specific functions. Here, we review recent advances and current pitfalls of in vitro and ex vivo models that display human GI functions. We also discuss how the disruptive technologies such as 3D organoids or a human organ-on-a-chip microphysiological system can contribute to better emulate host-gut microbiome crosstalks in health and disease. Finally, the medical and pharmaceutical significance of the gut microbiome-based personalized interventions is underlined as a future perspective.
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Allaire JM, Morampudi V, Crowley SM, Stahl M, Yu H, Bhullar K, Knodler LA, Bressler B, Jacobson K, Vallance BA. Frontline defenders: goblet cell mediators dictate host-microbe interactions in the intestinal tract during health and disease. Am J Physiol Gastrointest Liver Physiol 2018; 314:G360-G377. [PMID: 29122749 PMCID: PMC5899238 DOI: 10.1152/ajpgi.00181.2017] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Goblet cells (GCs) are the predominant secretory epithelial cells lining the luminal surface of the mammalian gastrointestinal (GI) tract. Best known for their apical release of mucin 2 (Muc2), which is critical for the formation of the intestinal mucus barrier, GCs have often been overlooked for their active contributions to intestinal protection and host defense. In part, this oversight reflects the limited tools available to study their function but also because GCs have long been viewed as relatively passive players in promoting intestinal homeostasis and host defense. In light of recent studies, this perspective has shifted, as current evidence suggests that Muc2 as well as other GC mediators are actively released into the lumen to defend the host when the GI tract is challenged by noxious stimuli. The ability of GCs to sense and respond to danger signals, such as bacterial pathogens, has recently been linked to inflammasome signaling, potentially intrinsic to the GCs themselves. Moreover, further work suggests that GCs release Muc2, as well as other mediators, to modulate the composition of the gut microbiome, leading to both the expansion as well as the depletion of specific gut microbes. This review will focus on the mechanisms by which GCs actively defend the host from noxious stimuli, as well as describe advanced technologies and new approaches by which their responses can be addressed. Taken together, we will highlight current insights into this understudied, yet critical, aspect of intestinal mucosal protection and its role in promoting gut defense and homeostasis.
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Affiliation(s)
- Joannie M. Allaire
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Vijay Morampudi
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Shauna M. Crowley
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Martin Stahl
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Hongbing Yu
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Kirandeep Bhullar
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Leigh A. Knodler
- 2Paul G. Allen School for Global Animal Health, College of Veterinary Medicine, Washington State University, Pullman, Washington
| | - Brian Bressler
- 3Division of Gastroenterology, Department of Medicine, St. Paul’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada
| | - Kevan Jacobson
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
| | - Bruce A. Vallance
- 1Division of Gastroenterology, Department of Pediatrics, BC Children’s Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
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Mazzocchi A, Soker S, Skardal A. Biofabrication Technologies for Developing In Vitro Tumor Models. CANCER DRUG DISCOVERY AND DEVELOPMENT 2018. [DOI: 10.1007/978-3-319-60511-1_4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Devarasetty M, Wang E, Soker S, Skardal A. Mesenchymal stem cells support growth and organization of host-liver colorectal-tumor organoids and possibly resistance to chemotherapy. Biofabrication 2017; 9:021002. [PMID: 28589925 DOI: 10.1088/1758-5090/aa7484] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Despite having yielded extensive breakthroughs in cancer research, traditional 2D cell cultures have limitations in studying cancer progression and metastasis and screening therapeutic candidates. 3D systems can allow cells to grow, migrate, and interact with each other and the surrounding matrix, resulting in more realistic constructs. Furthermore, interactions between host tissue and developing tumors influence the susceptibility of tumors to drug treatments. Host-liver colorectal-tumor spheroids composed of primary human hepatocytes, mesenchymal stem cells (MSC) and colon carcinoma HCT116 cells were created in simulated microgravity rotating wall vessel (RWV) bioreactors. The cells were seeded on hyaluronic acid-based microcarriers, loaded with liver-specific growth factors and ECM components. Only in the presence of MSC, large tumor foci rapidly formed inside the spheroids and increased in size steadily over time, while not greatly impacting albumin secretion from hepatocytes. The presence of MSC appeared to drive self-organization and formation of a stroma-like tissue surrounding the tumor foci and hepatocytes. Exposure to a commonly used chemotherapeutic 5-FU showed a dose-dependent cytotoxicity. However, if tumor organoids were allowed to mature in the RWV, they were less sensitive to the drug treatment. These data demonstrate the potential utility of liver tumor organoids for cancer progression and drug response modeling.
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Affiliation(s)
- Mahesh Devarasetty
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, NC, United States of America. Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Winston-Salem, NC, United States of America
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Crabbé A, Liu Y, Matthijs N, Rigole P, De La Fuente-Nùñez C, Davis R, Ledesma MA, Sarker S, Van Houdt R, Hancock REW, Coenye T, Nickerson CA. Antimicrobial efficacy against Pseudomonas aeruginosa biofilm formation in a three-dimensional lung epithelial model and the influence of fetal bovine serum. Sci Rep 2017; 7:43321. [PMID: 28256611 PMCID: PMC5335707 DOI: 10.1038/srep43321] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 01/25/2017] [Indexed: 12/14/2022] Open
Abstract
In vitro models that mimic in vivo host-pathogen interactions are needed to evaluate candidate drugs that inhibit bacterial virulence traits. We established a new approach to study Pseudomonas aeruginosa biofilm susceptibility on biotic surfaces, using a three-dimensional (3-D) lung epithelial cell model. P. aeruginosa formed antibiotic resistant biofilms on 3-D cells without affecting cell viability. The biofilm-inhibitory activity of antibiotics and/or the anti-biofilm peptide DJK-5 were evaluated on 3-D cells compared to a plastic surface, in medium with and without fetal bovine serum (FBS). In both media, aminoglycosides were more efficacious in the 3-D cell model. In serum-free medium, most antibiotics (except polymyxins) showed enhanced efficacy when 3-D cells were present. In medium with FBS, colistin was less efficacious in the 3-D cell model. DJK-5 exerted potent inhibition of P. aeruginosa association with both substrates, only in serum-free medium. DJK-5 showed stronger inhibitory activity against P. aeruginosa associated with plastic compared to 3-D cells. The combined addition of tobramycin and DJK-5 exhibited more potent ability to inhibit P. aeruginosa association with both substrates. In conclusion, lung epithelial cells influence the efficacy of most antimicrobials against P. aeruginosa biofilm formation, which in turn depends on the presence or absence of FBS.
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Affiliation(s)
- Aurélie Crabbé
- Laboratory of Pharmaceutical Microbiology (LPM), Ghent University, Ghent, Belgium.,The Biodesign Institute, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America
| | - Yulong Liu
- The Biodesign Institute, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America
| | - Nele Matthijs
- Laboratory of Pharmaceutical Microbiology (LPM), Ghent University, Ghent, Belgium
| | - Petra Rigole
- Laboratory of Pharmaceutical Microbiology (LPM), Ghent University, Ghent, Belgium
| | - César De La Fuente-Nùñez
- University of British Columbia, Centre for Microbial Diseases and Immunity Research, Vancouver, British Columbia, Canada
| | - Richard Davis
- The Biodesign Institute, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America
| | - Maria A Ledesma
- The Biodesign Institute, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America
| | - Shameema Sarker
- The Biodesign Institute, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America
| | - Rob Van Houdt
- Unit of Microbiology, Belgian Nuclear Research Centre (SCK·CEN), Mol, Belgium
| | - Robert E W Hancock
- University of British Columbia, Centre for Microbial Diseases and Immunity Research, Vancouver, British Columbia, Canada
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology (LPM), Ghent University, Ghent, Belgium
| | - Cheryl A Nickerson
- The Biodesign Institute, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, Arizona, United States of America.,School of Life Sciences, Arizona State University, Tempe, Arizona 85287, United States of America
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Barrila J, Yang J, Crabbé A, Sarker SF, Liu Y, Ott CM, Nelman-Gonzalez MA, Clemett SJ, Nydam SD, Forsyth RJ, Davis RR, Crucian BE, Quiriarte H, Roland KL, Brenneman K, Sams C, Loscher C, Nickerson CA. Three-dimensional organotypic co-culture model of intestinal epithelial cells and macrophages to study Salmonella enterica colonization patterns. NPJ Microgravity 2017; 3:10. [PMID: 28649632 PMCID: PMC5460263 DOI: 10.1038/s41526-017-0011-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/23/2016] [Accepted: 12/12/2016] [Indexed: 12/21/2022] Open
Abstract
Three-dimensional models of human intestinal epithelium mimic the differentiated form and function of parental tissues often not exhibited by two-dimensional monolayers and respond to Salmonella in key ways that reflect in vivo infections. To further enhance the physiological relevance of three-dimensional models to more closely approximate in vivo intestinal microenvironments encountered by Salmonella, we developed and validated a novel three-dimensional co-culture infection model of colonic epithelial cells and macrophages using the NASA Rotating Wall Vessel bioreactor. First, U937 cells were activated upon collagen-coated scaffolds. HT-29 epithelial cells were then added and the three-dimensional model was cultured in the bioreactor until optimal differentiation was reached, as assessed by immunohistochemical profiling and bead uptake assays. The new co-culture model exhibited in vivo-like structural and phenotypic characteristics, including three-dimensional architecture, apical-basolateral polarity, well-formed tight/adherens junctions, mucin, multiple epithelial cell types, and functional macrophages. Phagocytic activity of macrophages was confirmed by uptake of inert, bacteria-sized beads. Contribution of macrophages to infection was assessed by colonization studies of Salmonella pathovars with different host adaptations and disease phenotypes (Typhimurium ST19 strain SL1344 and ST313 strain D23580; Typhi Ty2). In addition, Salmonella were cultured aerobically or microaerobically, recapitulating environments encountered prior to and during intestinal infection, respectively. All Salmonella strains exhibited decreased colonization in co-culture (HT-29-U937) relative to epithelial (HT-29) models, indicating antimicrobial function of macrophages. Interestingly, D23580 exhibited enhanced replication/survival in both models following invasion. Pathovar-specific differences in colonization and intracellular co-localization patterns were observed. These findings emphasize the power of incorporating a series of related three-dimensional models within a study to identify microenvironmental factors important for regulating infection.
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Affiliation(s)
- Jennifer Barrila
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Jiseon Yang
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Aurélie Crabbé
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Shameema F. Sarker
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Yulong Liu
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - C. Mark Ott
- Biomedical Research and Environmental Sciences Division, NASA Johnson Space Center, Houston, TX USA
| | | | | | - Seth D. Nydam
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Rebecca J. Forsyth
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Richard R. Davis
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Brian E. Crucian
- Biomedical Research and Environmental Sciences Division, NASA Johnson Space Center, Houston, TX USA
| | | | - Kenneth L. Roland
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Karen Brenneman
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
| | - Clarence Sams
- Biomedical Research and Environmental Sciences Division, NASA Johnson Space Center, Houston, TX USA
| | - Christine Loscher
- Immunomodulation Research Group, School of Biotechnology, Dublin City University, Glasnevin, Ireland
| | - Cheryl A. Nickerson
- Center for Infectious Diseases and Vaccinology, The Biodesign Institute, Arizona State University, Tempe, AZ USA
- School of Life Sciences, Arizona State University, Tempe, AZ USA
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Flood P, Alvarez L, Reynaud EG. Free-floating epithelial micro-tissue arrays: a low cost and versatile technique. Biofabrication 2016; 8:045006. [DOI: 10.1088/1758-5090/8/4/045006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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31
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Higginson EE, Galen JE, Levine MM, Tennant SM. Microgravity as a biological tool to examine host-pathogen interactions and to guide development of therapeutics and preventatives that target pathogenic bacteria. Pathog Dis 2016; 74:ftw095. [PMID: 27630185 DOI: 10.1093/femspd/ftw095] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2016] [Indexed: 12/16/2022] Open
Abstract
Space exploration programs have long been interested in the effects of spaceflight on biology. This research is important not only in its relevance to future deep space exploration, but also because it has allowed investigators to ask questions about how gravity impacts cell behavior here on Earth. In the 1980s, scientists designed and built the first rotating wall vessel, capable of mimicking the low shear environment found in space. This vessel has since been used to investigate growth of both microorganisms and human tissue cells in low shear modeled microgravity conditions. Bacterial behavior has been shown to be altered both in space and under simulated microgravity conditions. In some cases, bacteria appear attenuated, whereas in others virulence is enhanced. This has consequences not only for manned spaceflight, but poses larger questions about the ability of bacteria to sense the world around them. By using the microgravity environment as a tool, we can exploit this phenomenon in the search for new therapeutics and preventatives against pathogenic bacteria for use both in space and on Earth.
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Affiliation(s)
- Ellen E Higginson
- Center for Vaccine Development and Institute for Global Health, University of Maryland School of Medicine, Baltimore, MD 21201, USA Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - James E Galen
- Center for Vaccine Development and Institute for Global Health, University of Maryland School of Medicine, Baltimore, MD 21201, USA Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Myron M Levine
- Center for Vaccine Development and Institute for Global Health, University of Maryland School of Medicine, Baltimore, MD 21201, USA Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA Department of Pediatrics, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Sharon M Tennant
- Center for Vaccine Development and Institute for Global Health, University of Maryland School of Medicine, Baltimore, MD 21201, USA Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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Salerno-Goncalves R, Fasano A, Sztein MB. Development of a Multicellular Three-dimensional Organotypic Model of the Human Intestinal Mucosa Grown Under Microgravity. J Vis Exp 2016. [PMID: 27500889 DOI: 10.3791/54148] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Because cells growing in a three-dimensional (3-D) environment have the potential to bridge many gaps of cell cultivation in 2-D environments (e.g., flasks or dishes). In fact, it is widely recognized that cells grown in flasks or dishes tend to de-differentiate and lose specialized features of the tissues from which they were derived. Currently, there are mainly two types of 3-D culture systems where the cells are seeded into scaffolds mimicking the native extracellular matrix (ECM): (a) static models and (b) models using bioreactors. The first breakthrough was the static 3-D models. 3-D models using bioreactors such as the rotating-wall-vessel (RWV) bioreactors are a more recent development. The original concept of the RWV bioreactors was developed at NASA's Johnson Space Center in the early 1990s and is believed to overcome the limitations of static models such as the development of hypoxic, necrotic cores. The RWV bioreactors might circumvent this problem by providing fluid dynamics that allow the efficient diffusion of nutrients and oxygen. These bioreactors consist of a rotator base that serves to support and rotate two different formats of culture vessels that differ by their aeration source type: (1) Slow Turning Lateral Vessels (STLVs) with a co-axial oxygenator in the center, or (2) High Aspect Ratio Vessels (HARVs) with oxygenation via a flat, silicone rubber gas transfer membrane. These vessels allow efficient gas transfer while avoiding bubble formation and consequent turbulence. These conditions result in laminar flow and minimal shear force that models reduced gravity (microgravity) inside the culture vessel. Here we describe the development of a multicellular 3-D organotypic model of the human intestinal mucosa composed of an intestinal epithelial cell line and primary human lymphocytes, endothelial cells and fibroblasts cultured under microgravity provided by the RWV bioreactor.
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Affiliation(s)
| | - Alessio Fasano
- Mucosal Immunology and Biology Research Center, Massachusetts General Hospital for Children
| | - Marcelo B Sztein
- Center for Vaccine Development, Department of Pediatrics, University of Maryland School of Medicine
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Shah P, Fritz JV, Glaab E, Desai MS, Greenhalgh K, Frachet A, Niegowska M, Estes M, Jäger C, Seguin-Devaux C, Zenhausern F, Wilmes P. A microfluidics-based in vitro model of the gastrointestinal human-microbe interface. Nat Commun 2016; 7:11535. [PMID: 27168102 PMCID: PMC4865890 DOI: 10.1038/ncomms11535] [Citation(s) in RCA: 386] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 04/06/2016] [Indexed: 12/17/2022] Open
Abstract
Changes in the human gastrointestinal microbiome are associated with several diseases. To infer causality, experiments in representative models are essential, but widely used animal models exhibit limitations. Here we present a modular, microfluidics-based model (HuMiX, human–microbial crosstalk), which allows co-culture of human and microbial cells under conditions representative of the gastrointestinal human–microbe interface. We demonstrate the ability of HuMiX to recapitulate in vivo transcriptional, metabolic and immunological responses in human intestinal epithelial cells following their co-culture with the commensal Lactobacillus rhamnosus GG (LGG) grown under anaerobic conditions. In addition, we show that the co-culture of human epithelial cells with the obligate anaerobe Bacteroides caccae and LGG results in a transcriptional response, which is distinct from that of a co-culture solely comprising LGG. HuMiX facilitates investigations of host–microbe molecular interactions and provides insights into a range of fundamental research questions linking the gastrointestinal microbiome to human health and disease. Research on the interactions between the gut microbiota and human cells would greatly benefit from improved in vitro models. Here, Shah et al. present a modular microfluidics-based model that allows co-culture of human and microbial cells followed by 'omic' molecular analyses of the two cell contingents.
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Affiliation(s)
- Pranjul Shah
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Joëlle V Fritz
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Enrico Glaab
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Mahesh S Desai
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Kacy Greenhalgh
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Audrey Frachet
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Magdalena Niegowska
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Matthew Estes
- Center for Applied Nanobioscience and Medicine, University of Arizona, 145S 79th Street, Suite 16, Chandler, Arizona 85226, USA
| | - Christian Jäger
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
| | - Carole Seguin-Devaux
- Department of Infection and Immunity, Luxembourg Institute of Health, 29 rue Henri Koch, Esch-sur-Alzette L-4354, Luxembourg
| | - Frederic Zenhausern
- Center for Applied Nanobioscience and Medicine, University of Arizona, 145S 79th Street, Suite 16, Chandler, Arizona 85226, USA.,Department of Basic Medical Sciences, University of Arizona, 425N. 5th Street, Phoenix, Arizona 85004, USA
| | - Paul Wilmes
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 6 avenue du Swing, Belvaux L-4367, Luxembourg
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Infection models of human norovirus: challenges and recent progress. Arch Virol 2016; 161:779-88. [PMID: 26780772 DOI: 10.1007/s00705-016-2748-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 12/30/2015] [Indexed: 10/22/2022]
Abstract
Human norovirus (hNoV) infections cause acute gastroenteritis, accounting for millions of disease cases and more than 200,000 deaths annually. However, the lack of in vitro infection models and robust small-animal models has posed barriers to the development of virus-specific therapies and preventive vaccines. Promising recent progress in the development of a norovirus infection model is reviewed in this article, as well as attempts and efforts made since the discovery of hNoV more than 40 years ago. Because suitable experimental animal models for human norovirus are lacking, attractive alternatives are also discussed.
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A Three-Dimensional Cell Culture Model To Study Enterovirus Infection of Polarized Intestinal Epithelial Cells. mSphere 2015; 1:mSphere00030-15. [PMID: 27303677 PMCID: PMC4863623 DOI: 10.1128/msphere.00030-15] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 10/26/2015] [Indexed: 11/20/2022] Open
Abstract
Despite serving as the primary entry portal for coxsackievirus B (CVB), little is known about CVB infection of the intestinal epithelium, owing at least in part to the lack of suitable in vivo models and the inability of cultured cells to recapitulate the complexity and structure associated with the gastrointestinal (GI) tract. Here, we report on the development of a three-dimensional (3-D) organotypic cell culture model of Caco-2 cells to model CVB infection of the gastrointestinal epithelium. We show that Caco-2 cells grown in 3-D using the rotating wall vessel (RWV) bioreactor recapitulate many of the properties of the intestinal epithelium, including the formation of well-developed tight junctions, apical-basolateral polarity, brush borders, and multicellular complexity. In addition, transcriptome analyses using transcriptome sequencing (RNA-Seq) revealed the induction of a number of genes associated with intestinal epithelial differentiation and/or intestinal processes in vivo when Caco-2 cells were cultured in 3-D. Applying this model to CVB infection, we found that although the levels of intracellular virus production were similar in two-dimensional (2-D) and 3-D Caco-2 cell cultures, the release of infectious CVB was enhanced in 3-D cultures at early stages of infection. Unlike CVB, the replication of poliovirus (PV) was significantly reduced in 3-D Caco-2 cell cultures. Collectively, our studies show that Caco-2 cells grown in 3-D using the RWV bioreactor provide a cell culture model that structurally and transcriptionally represents key aspects of cells in the human GI tract and can thus be used to expand our understanding of enterovirus-host interactions in intestinal epithelial cells. IMPORTANCE Coxsackievirus B (CVB), a member of the enterovirus family of RNA viruses, is associated with meningitis, pericarditis, diabetes, dilated cardiomyopathy, and myocarditis, among other pathologies. CVB is transmitted via the fecal-oral route and encounters the epithelium lining the gastrointestinal tract early in infection. The lack of suitable in vivo and in vitro models to study CVB infection of the gastrointestinal epithelium has limited our understanding of the events that surround infection of these specialized cells. Here, we report on the development of a three-dimensional (3-D) organotypic cell culture model of human intestinal epithelial cells that better models the gastrointestinal epithelium in vivo. By applying this 3-D model, which recapitulates many aspects of the gastrointestinal epithelium in vivo, to the study of CVB infection, our work provides a new cell system to model the mechanisms by which CVB infects the intestinal epithelium, which may have a profound impact on CVB pathogenesis. Podcast: A podcast concerning this article is available.
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Skardal A, Devarasetty M, Soker S, Hall AR. In situ patterned micro 3D liver constructs for parallel toxicology testing in a fluidic device. Biofabrication 2015; 7:031001. [PMID: 26355538 DOI: 10.1088/1758-5090/7/3/031001] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
3D tissue models are increasingly being implemented for drug and toxicology testing. However, the creation of tissue-engineered constructs for this purpose often relies on complex biofabrication techniques that are time consuming, expensive, and difficult to scale up. Here, we describe a strategy for realizing multiple tissue constructs in a parallel microfluidic platform using an approach that is simple and can be easily scaled for high-throughput formats. Liver cells mixed with a UV-crosslinkable hydrogel solution are introduced into parallel channels of a sealed microfluidic device and photopatterned to produce stable tissue constructs in situ. The remaining uncrosslinked material is washed away, leaving the structures in place. By using a hydrogel that specifically mimics the properties of the natural extracellular matrix, we closely emulate native tissue, resulting in constructs that remain stable and functional in the device during a 7-day culture time course under recirculating media flow. As proof of principle for toxicology analysis, we expose the constructs to ethyl alcohol (0-500 mM) and show that the cell viability and the secretion of urea and albumin decrease with increasing alcohol exposure, while markers for cell damage increase.
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Affiliation(s)
- Aleksander Skardal
- Wake Forest Institute for Regenerative Medicine, Wake Forest Baptist Health, Medical Center Boulevard, Winston-Salem, NC 27157, USA. Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Wake Forest Baptist Health, Medical Center Boulevard, Winston-Salem, NC 27157, USA. Comprehensive Cancer Center, Wake Forest Baptist Health, Medical Center Boulevard, Winston-Salem, NC 27157, USA
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Benam KH, Dauth S, Hassell B, Herland A, Jain A, Jang KJ, Karalis K, Kim HJ, MacQueen L, Mahmoodian R, Musah S, Torisawa YS, van der Meer AD, Villenave R, Yadid M, Parker KK, Ingber DE. Engineered in vitro disease models. ANNUAL REVIEW OF PATHOLOGY-MECHANISMS OF DISEASE 2015; 10:195-262. [PMID: 25621660 DOI: 10.1146/annurev-pathol-012414-040418] [Citation(s) in RCA: 355] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The ultimate goal of most biomedical research is to gain greater insight into mechanisms of human disease or to develop new and improved therapies or diagnostics. Although great advances have been made in terms of developing disease models in animals, such as transgenic mice, many of these models fail to faithfully recapitulate the human condition. In addition, it is difficult to identify critical cellular and molecular contributors to disease or to vary them independently in whole-animal models. This challenge has attracted the interest of engineers, who have begun to collaborate with biologists to leverage recent advances in tissue engineering and microfabrication to develop novel in vitro models of disease. As these models are synthetic systems, specific molecular factors and individual cell types, including parenchymal cells, vascular cells, and immune cells, can be varied independently while simultaneously measuring system-level responses in real time. In this article, we provide some examples of these efforts, including engineered models of diseases of the heart, lung, intestine, liver, kidney, cartilage, skin and vascular, endocrine, musculoskeletal, and nervous systems, as well as models of infectious diseases and cancer. We also describe how engineered in vitro models can be combined with human inducible pluripotent stem cells to enable new insights into a broad variety of disease mechanisms, as well as provide a test bed for screening new therapies.
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Affiliation(s)
- Kambez H Benam
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts 02115;
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Skardal A, Devarasetty M, Rodman C, Atala A, Soker S. Liver-Tumor Hybrid Organoids for Modeling Tumor Growth and Drug Response In Vitro. Ann Biomed Eng 2015; 43:2361-73. [PMID: 25777294 DOI: 10.1007/s10439-015-1298-3] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 03/10/2015] [Indexed: 12/27/2022]
Abstract
Current in vitro models for tumor growth and metastasis are poor facsimiles of in vivo cancer physiology and thus, are not optimal for anti-cancer drug development. Three dimensional (3D) tissue organoid systems, which utilize human cells in a tailored microenvironment, have the potential to recapitulate in vivo conditions and address the drawbacks of current tissue culture dish 2D models. In this study, we created liver-based cell organoids in a rotating wall vessel bioreactor. The organoids were further inoculated with colon carcinoma cells in order to create liver-tumor organoids for in vitro modeling of liver metastasis. Immunofluorescent staining revealed notable phenotypic differences between tumor cells in 2D and inside the organoids. In 2D they displayed an epithelial phenotype, and only after transition to the organoids did the cells present with a mesenchymal phenotype. The cell surface marker expression results suggested that WNT pathway might be involved in the phenotypic changes observed between cells in 2D and organoid conditions, and may lead to changes in cell proliferation. Manipulating the WNT pathway with an agonist and antagonist showed significant changes in sensitivity to the anti-proliferative drug 5-fluoruracil. Collectively, the results show the potential of in vitro 3D liver-tumor organoids to serve as a model for metastasis growth and for testing the response of tumor cells to current and newly discovered drugs.
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Affiliation(s)
- Aleksander Skardal
- Wake Forest Institute for Regenerative Medicine, Wake Forest University Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157-1094, USA
| | - Mahesh Devarasetty
- Wake Forest Institute for Regenerative Medicine, Wake Forest University Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157-1094, USA
| | - Christopher Rodman
- Wake Forest Institute for Regenerative Medicine, Wake Forest University Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157-1094, USA
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest University Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157-1094, USA
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Wake Forest University Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC, 27157-1094, USA.
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Vorwerk S, Krieger V, Deiwick J, Hensel M, Hansmeier N. Proteomes of host cell membranes modified by intracellular activities of Salmonella enterica. Mol Cell Proteomics 2014; 14:81-92. [PMID: 25348832 DOI: 10.1074/mcp.m114.041145] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Intracellular pathogens need to establish a growth-stimulating host niche for survival and replication. A unique feature of the gastrointestinal pathogen Salmonella enterica serovar Typhimurium is the creation of extensive membrane networks within its host. An understanding of the origin and function of these membranes is crucial for the development of new treatment strategies. However, the characterization of this compartment is very challenging, and only fragmentary knowledge of its composition and biogenesis exists. Here, we describe a new proteome-based approach to enrich and characterize Salmonella-modified membranes. Using a Salmonella mutant strain that does not form this unique membrane network as a reference, we identified a high-confidence set of host proteins associated with Salmonella-modified membranes. This comprehensive analysis allowed us to reconstruct the interactions of Salmonella with host membranes. For example, we noted that Salmonella redirects endoplasmic reticulum (ER) membrane trafficking to its intracellular niche, a finding that has not been described for Salmonella previously. Our system-wide approach therefore has the potential to rapidly close gaps in our knowledge of the infection process of intracellular pathogens and demonstrates a hitherto unrecognized complexity in the formation of Salmonella host niches.
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Affiliation(s)
- Stephanie Vorwerk
- From the ‡Division of Microbiology, School of Biology/Chemistry, University of Osnabrück, 49076 Osnabrück, Germany
| | - Viktoria Krieger
- From the ‡Division of Microbiology, School of Biology/Chemistry, University of Osnabrück, 49076 Osnabrück, Germany
| | - Jörg Deiwick
- From the ‡Division of Microbiology, School of Biology/Chemistry, University of Osnabrück, 49076 Osnabrück, Germany
| | - Michael Hensel
- From the ‡Division of Microbiology, School of Biology/Chemistry, University of Osnabrück, 49076 Osnabrück, Germany
| | - Nicole Hansmeier
- From the ‡Division of Microbiology, School of Biology/Chemistry, University of Osnabrück, 49076 Osnabrück, Germany
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Crabbé A, Ledesma MA, Nickerson CA. Mimicking the host and its microenvironment in vitro for studying mucosal infections by Pseudomonas aeruginosa. Pathog Dis 2014; 71:1-19. [PMID: 24737619 DOI: 10.1111/2049-632x.12180] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 04/09/2014] [Accepted: 04/09/2014] [Indexed: 02/01/2023] Open
Abstract
Why is a healthy person protected from Pseudomonas aeruginosa infections, while individuals with cystic fibrosis or damaged epithelium are particularly susceptible to this opportunistic pathogen? To address this question, it is essential to thoroughly understand the dynamic interplay between the host microenvironment and P. aeruginosa. Therefore, using model systems that represent key aspects of human mucosal tissues in health and disease allows recreating in vivo host-pathogen interactions in a physiologically relevant manner. In this review, we discuss how factors of mucosal tissues, such as apical-basolateral polarity, junctional complexes, extracellular matrix proteins, mucus, multicellular complexity (including indigenous microbiota), and other physicochemical factors affect P. aeruginosa pathogenesis and are thus important to mimic in vitro. We highlight in vitro cell and tissue culture model systems of increasing complexity that have been used over the past 35 years to study the infectious disease process of P. aeruginosa, mainly focusing on lung models, and their respective advantages and limitations. Continued improvements of in vitro models based on our expanding knowledge of host microenvironmental factors that participate in P. aeruginosa pathogenesis will help advance fundamental understanding of pathogenic mechanisms and increase the translational potential of research findings from bench to the patient's bedside.
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Affiliation(s)
- Aurélie Crabbé
- The Biodesign Institute, Center for Infectious Diseases and Vaccinology, Arizona State University, Tempe, AZ, USA
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Marzorati M, Vanhoecke B, De Ryck T, Sadaghian Sadabad M, Pinheiro I, Possemiers S, Van den Abbeele P, Derycke L, Bracke M, Pieters J, Hennebel T, Harmsen HJ, Verstraete W, Van de Wiele T. The HMI™ module: a new tool to study the Host-Microbiota Interaction in the human gastrointestinal tract in vitro. BMC Microbiol 2014; 14:133. [PMID: 24884540 PMCID: PMC4039060 DOI: 10.1186/1471-2180-14-133] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 04/24/2014] [Indexed: 02/07/2023] Open
Abstract
Background Recent scientific developments have shed more light on the importance of the host-microbe interaction, particularly in the gut. However, the mechanistic study of the host-microbe interplay is complicated by the intrinsic limitations in reaching the different areas of the gastrointestinal tract (GIT) in vivo. In this paper, we present the technical validation of a new device - the Host-Microbiota Interaction (HMI) module - and the evidence that it can be used in combination with a gut dynamic simulator to evaluate the effect of a specific treatment at the level of the luminal microbial community and of the host surface colonization and signaling. Results The HMI module recreates conditions that are physiologically relevant for the GIT: i) a mucosal area to which bacteria can adhere under relevant shear stress (3 dynes cm−2); ii) the bilateral transport of low molecular weight metabolites (4 to 150 kDa) with permeation coefficients ranging from 2.4 × 10−6 to 7.1 × 10−9 cm sec−1; and iii) microaerophilic conditions at the bottom of the growing biofilm (PmO2 = 2.5 × 10−4 cm sec−1). In a long-term study, the host’s cells in the HMI module were still viable after a 48-hour exposure to a complex microbial community. The dominant mucus-associated microbiota differed from the luminal one and its composition was influenced by the treatment with a dried product derived from yeast fermentation. The latter - with known anti-inflammatory properties - induced a decrease of pro-inflammatory IL-8 production between 24 and 48 h. Conclusions The study of the in vivo functionality of adhering bacterial communities in the human GIT and of the localized effect on the host is frequently hindered by the complexity of reaching particular areas of the GIT. The HMI module offers the possibility of co-culturing a gut representative microbial community with enterocyte-like cells up to 48 h and may therefore contribute to the mechanistic understanding of host-microbiome interactions.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - Tom Van de Wiele
- Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium.
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Antagonistic mechanisms of synbiosis between Lactobacillus plantarum CIF17AN2 and green banana starch in the proximal colon model challenged with Salmonella Typhimurium. Anaerobe 2014; 28:44-53. [PMID: 24858321 DOI: 10.1016/j.anaerobe.2014.05.002] [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: 02/09/2014] [Revised: 05/07/2014] [Accepted: 05/08/2014] [Indexed: 01/01/2023]
Abstract
Antagonistic mechanisms of Lactobacillus plantarum CIF17AN2 (an infant isolate), saba starch, and their synbiotic combination against Salmonella Typhimurium SA2093 were evaluated. The anti-Salmonella activity was investigated under the competitive niche of fecal microbiota using the simulated proximal colon model. The alterations of the dominant fecal microbiota and beneficial bacteria were also displayed using FISH and PCR-DGGE techniques. L. plantarum CIF17AN2 exhibited anti-Salmonella mechanisms through secretion of antimicrobial compounds, adhesion ability and competitive adhesion to mucin and HT-29 cell line. However, the Salmonella inhibition was significantly reduced in the presence of human fecal microflora. The combination of saba starch with L. plantarum CIF17AN2 showed the greatest inhibition against Sal. Typhimurium SA2093 in the simulated colon model. The enhancement of anti-Salmonella activity due to the addition of saba starch corresponded to a significant decrease in pH and an increase of lactic acid and short chain fatty acids. According to PCR-DGGE analysis, L. plantarum CIF17AN2 was able to survive and effectively compete with fecal microflora. Saba starch supplement modified bifidobacterial profile but had a slight impact on the profile of lactic acid bacteria. This prebiotic approach alleviated the nutrient limitation in the proximal colon model leading to the selective stimulation of beneficial lactobacilli and bifidobacteria, hence the enhancement of anti-Salmonella activity.
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Astashkina A, Grainger DW. Critical analysis of 3-D organoid in vitro cell culture models for high-throughput drug candidate toxicity assessments. Adv Drug Deliv Rev 2014; 69-70:1-18. [PMID: 24613390 DOI: 10.1016/j.addr.2014.02.008] [Citation(s) in RCA: 132] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 02/14/2014] [Accepted: 02/18/2014] [Indexed: 12/18/2022]
Abstract
Drug failure due to toxicity indicators remains among the primary reasons for staggering drug attrition rates during clinical studies and post-marketing surveillance. Broader validation and use of next-generation 3-D improved cell culture models are expected to improve predictive power and effectiveness of drug toxicological predictions. However, after decades of promising research significant gaps remain in our collective ability to extract quality human toxicity information from in vitro data using 3-D cell and tissue models. Issues, challenges and future directions for the field to improve drug assay predictive power and reliability of 3-D models are reviewed.
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Costello CM, Hongpeng J, Shaffiey S, Yu J, Jain NK, Hackam D, March JC. Synthetic small intestinal scaffolds for improved studies of intestinal differentiation. Biotechnol Bioeng 2014; 111:1222-32. [PMID: 24390638 DOI: 10.1002/bit.25180] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Revised: 11/11/2013] [Accepted: 12/23/2013] [Indexed: 12/11/2022]
Abstract
In vitro intestinal models can provide new insights into small intestinal function, including cellular growth and proliferation mechanisms, drug absorption capabilities, and host-microbial interactions. These models are typically formed with cells cultured on 2D scaffolds or transwell inserts, but it is widely understood that epithelial cells cultured in 3D environments exhibit different phenotypes that are more reflective of native tissue. Our focus was to develop a porous, synthetic 3D tissue scaffold with villous features that could support the culture of epithelial cell types to mimic the natural microenvironment of the small intestine. We demonstrated that our scaffold could support the co-culture of Caco-2 cells with a mucus-producing cell line, HT29-MTX, as well as small intestinal crypts from mice for extended periods. By recreating the surface topography with accurately sized intestinal villi, we enable cellular differentiation along the villous axis in a similar manner to native intestines. In addition, we show that the biochemical microenvironments of the intestine can be further simulated via a combination of apical and basolateral feeding of intestinal cell types cultured on the 3D models.
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Affiliation(s)
- Cait M Costello
- Biological and Environmental Engineering, Cornell University, Ithaca, New York
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Abstract
While human or animal models are often considered the gold standard experimental system for defining virulence factors, cell culture-based infection models have proven useful for identifying important virulence factors and for examining the interactions between pathogens and the epithelial barrier. The first step in infections for most mucosal pathogens involves binding (adhesion) to the epithelial cells that line the mucosa. Successful pathogens can then penetrate the barrier by (1) inducing their uptake (i.e., "entry" or "invasion") into epithelial cells, (2) crossing the barrier by inducing epithelial cell death, and/or (3) penetrating between cells. This chapter describes growth conditions to form polarized cultures, either two-dimensional monolayers or three-dimensional cysts, of various immortalized epithelial cell lines. It describes assays to measure key early interactions between P. aeruginosa and host cells, including binding, invasion, and cytotoxicity. Many virulence factors defined by these criteria have been shown to be important for pathogenesis of P. aeruginosa infections in animals or humans. These methods are also applicable to other pathogens.
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Affiliation(s)
- Iwona Bucior
- Department of Medicine, University of California, San Francisco, 0654, Room S380, 513 Parnassus Ave, San Francisco, CA, 94143-0654, USA
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Roy U, Bulot C, Honer zu Bentrup K, Mondal D. Specific increase in MDR1 mediated drug-efflux in human brain endothelial cells following co-exposure to HIV-1 and saquinavir. PLoS One 2013; 8:e75374. [PMID: 24098380 PMCID: PMC3789726 DOI: 10.1371/journal.pone.0075374] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 08/14/2013] [Indexed: 12/16/2022] Open
Abstract
Persistence of HIV-1 reservoirs within the Central Nervous System (CNS) remains a significant challenge to the efficacy of potent anti-HIV-1 drugs. The primary human Brain Microvascular Endothelial Cells (HBMVEC) constitutes the Blood Brain Barrier (BBB) which interferes with anti-HIV drug delivery into the CNS. The ATP binding cassette (ABC) transporters expressed on HBMVEC can efflux HIV-1 protease inhibitors (HPI), enabling the persistence of HIV-1 in CNS. Constitutive low level expression of several ABC-transporters, such as MDR1 (a.k.a. P-gp) and MRPs are documented in HBMVEC. Although it is recognized that inflammatory cytokines and exposure to xenobiotic drug substrates (e.g HPI) can augment the expression of these transporters, it is not known whether concomitant exposure to virus and anti-retroviral drugs can increase drug-efflux functions in HBMVEC. Our in vitro studies showed that exposure of HBMVEC to HIV-1 significantly up-regulates both MDR1 gene expression and protein levels; however, no significant increases in either MRP-1 or MRP-2 were observed. Furthermore, calcein-AM dye-efflux assays using HBMVEC showed that, compared to virus exposure alone, the MDR1 mediated drug-efflux function was significantly induced following concomitant exposure to both HIV-1 and saquinavir (SQV). This increase in MDR1 mediated drug-efflux was further substantiated via increased intracellular retention of radiolabeled [(3)H-] SQV. The crucial role of MDR1 in (3)H-SQV efflux from HBMVEC was further confirmed by using both a MDR1 specific blocker (PSC-833) and MDR1 specific siRNAs. Therefore, MDR1 specific drug-efflux function increases in HBMVEC following co-exposure to HIV-1 and SQV which can reduce the penetration of HPIs into the infected brain reservoirs of HIV-1. A targeted suppression of MDR1 in the BBB may thus provide a novel strategy to suppress residual viral replication in the CNS, by augmenting the therapeutic efficacy of HAART drugs.
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Affiliation(s)
- Upal Roy
- Department of Pharmacology, Tulane University Health Sciences Center, New Orleans, Louisiana, United States of America
- * E-mail:
| | - Christine Bulot
- Department of Pharmacology, Tulane University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Kerstin Honer zu Bentrup
- Department of Microbiology and Immunology, Tulane University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Debasis Mondal
- Department of Pharmacology, Tulane University Health Sciences Center, New Orleans, Louisiana, United States of America
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Takanashi S, Saif LJ, Hughes JH, Meulia T, Jung K, Scheuer KA, Wang Q. Failure of propagation of human norovirus in intestinal epithelial cells with microvilli grown in three-dimensional cultures. Arch Virol 2013; 159:257-66. [PMID: 23974469 DOI: 10.1007/s00705-013-1806-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Accepted: 06/21/2013] [Indexed: 12/11/2022]
Abstract
Human noroviruses (HuNoVs) are a leading cause of acute gastroenteritis. Establishment of a cell culture system for in vitro HuNoV growth remains challenging. Replication of HuNoVs in human intestinal cell lines (INT-407 and Caco-2) that differentiate to produce microvilli in rotation wall vessel (RWV) three-dimensional cultures has been reported (Straub et al. in Emerg Infect Dis 13:396-403, 2007; J Water Health 9:225-240, 2011, and Water Sci Technol 67:863-868, 2013). We used a similar RWV system, intestinal cell lines, and the same (Genogroup [G] I.1) plus additional (GII.4 and GII.12) HuNoV strains to test the system's reproducibility and to expand the earlier findings. Apical microvilli were observed on the surface of both cell lines by light and electron microscopy. However, none of the cell types tested resulted in productive viral replication of any of the HuNoV strains, as confirmed by plateau or declining viral RNA titers in the supernatants and cell lysates of HuNoV-infected cells, determined by real-time reverse transcription PCR. These trends were the same when culture supplements were added that have been reported to be effective for replication of other fastidious enteric viruses in vitro. Additionally, by confocal microscopy and orthoslice analysis, viral capsid proteins were mainly observed above the actin filament signals, which suggested that the majority of viral antigens were on the cell surface. We conclude that even intestinal cells displaying microvilli were not sufficient to support HuNoV replication under the conditions tested.
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Affiliation(s)
- Sayaka Takanashi
- Food Animal Health Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, 1680 Madison Avenue, Wooster, OH, 44691, USA
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Goodwin TJ, McCarthy M, Osterrieder N, Cohrs RJ, Kaufer BB. Three-dimensional normal human neural progenitor tissue-like assemblies: a model of persistent varicella-zoster virus infection. PLoS Pathog 2013; 9:e1003512. [PMID: 23935496 PMCID: PMC3731237 DOI: 10.1371/journal.ppat.1003512] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Accepted: 06/03/2013] [Indexed: 11/26/2022] Open
Abstract
Varicella-zoster virus (VZV) is a neurotropic human alphaherpesvirus that causes varicella upon primary infection, establishes latency in multiple ganglionic neurons, and can reactivate to cause zoster. Live attenuated VZV vaccines are available; however, they can also establish latent infections and reactivate. Studies of VZV latency have been limited to the analyses of human ganglia removed at autopsy, as the virus is strictly a human pathogen. Recently, terminally differentiated human neurons have received much attention as a means to study the interaction between VZV and human neurons; however, the short life-span of these cells in culture has limited their application. Herein, we describe the construction of a model of normal human neural progenitor cells (NHNP) in tissue-like assemblies (TLAs), which can be successfully maintained for at least 180 days in three-dimensional (3D) culture, and exhibit an expression profile similar to that of human trigeminal ganglia. Infection of NHNP TLAs with cell-free VZV resulted in a persistent infection that was maintained for three months, during which the virus genome remained stable. Immediate-early, early and late VZV genes were transcribed, and low-levels of infectious VZV were recurrently detected in the culture supernatant. Our data suggest that NHNP TLAs are an effective system to investigate long-term interactions of VZV with complex assemblies of human neuronal cells. Varicella-zoster virus (VZV), the alphaherpesvirus that typically causes childhood chickenpox and shingles in adults, becomes latent in neurons, thus remaining in the body for a lifetime. Unfortunately, few models are available to study the establishment of VZV latency since the virus infects only humans and establishes persistent infections and latency only in neurons, a slowly proliferating, short-lived cell in culture. We have successfully maintained normal human neural progenitor cells (NHNP) in tissue-like assemblies (TLAs) in 3-dimensional (3D) cultures for up to 6 months. The 3D NHNP TLAs show some characteristics as those found in the human trigeminal ganglia, the site of VZV latency. NHNP TLAs infected with VZV remain viable for 3 months during which time VZV DNA replicates and remains genetically stable, virus genes are transcribed, and infectious VZV is sporadically released. The ability to maintain VZV infected NHNP cells in culture for extended times provides the unique opportunity to study the molecular interactions between this important human pathogen and neuronal tissue to an extent previously unattainable.
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Affiliation(s)
- Thomas J. Goodwin
- Disease Modeling/Tissue Analogues Laboratory, NASA Johnson Space Center, Houston, Texas, United States of America
- * E-mail: (TJG); (RJC); (BBK)
| | - Maureen McCarthy
- Disease Modeling/Tissue Analogues Laboratory, NASA Johnson Space Center, Houston, Texas, United States of America
| | | | - Randall J. Cohrs
- Department of Neurology, University of Colorado School of Medicine, Aurora, Colorado, United States of America
- * E-mail: (TJG); (RJC); (BBK)
| | - Benedikt B. Kaufer
- Institut für Virologie, Freie Universität Berlin, Berlin, Germany
- * E-mail: (TJG); (RJC); (BBK)
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Venema K, van den Abbeele P. Experimental models of the gut microbiome. Best Pract Res Clin Gastroenterol 2013; 27:115-26. [PMID: 23768557 DOI: 10.1016/j.bpg.2013.03.002] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 03/02/2013] [Accepted: 03/14/2013] [Indexed: 02/08/2023]
Abstract
The human gut contains a diverse microbiota with large potential to influence health. Given the difficulty to access the main sites of the gut, in vitro models have been developed to dynamically monitor microbial processes at the site of metabolic activity. These models range from simple batch fermentations to complex multi-compartmental continuous systems. The latter include different models, focussing on similar but each also on distinct digestive parameters. The most intensively used include the three-stage continuous culture system, SHIME(®), EnteroMix, Lacroix model and TIM-2. Especially after inclusion of surface-attached mucosal microbes (M-SHIME), such models have been shown representative of the in vivo situation in terms of microbial composition and activity. They have even been shown to maintain the interpersonal variation among different human fecal inocula. Novel developments, such as the incorporation of host cells, will further broaden the potential of in vitro models to unravel the importance of gut microbes for human health and disease.
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Affiliation(s)
- Koen Venema
- TNO, P.O. Box 360, 3700 AJ Zeist, The Netherlands.
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Roeselers G, Ponomarenko M, Lukovac S, Wortelboer HM. Ex vivo systems to study host-microbiota interactions in the gastrointestinal tract. Best Pract Res Clin Gastroenterol 2013; 27:101-13. [PMID: 23768556 DOI: 10.1016/j.bpg.2013.03.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Revised: 03/18/2013] [Accepted: 03/26/2013] [Indexed: 01/31/2023]
Abstract
It is increasingly apparent that the microbial ecosystems in the mammalian gastrointestinal tract play an intricate role in health and disease. There is a growing interest in the development of targeted strategies for modulating health through the modification of these microbiota. Ecologists are faced with the challenge of understanding the structure and function of ecosystems, the component parts of which interact with each other in complex and diffuse ways. The human gut microbiota, with its high species richness and diversity (up to 1000 bacterial species per individual) including members of all three domains of life, situated in the dynamic environment of the gastrointestinal tract, is probably among the most complex ecosystems on this planet. In order to elucidate the mechanistic foundations, and physiological significance, of beneficial or pathogenic relationships between the gut microbiota and their hosts, researchers require tractable model ecosystems that allow to recapitulate and investigate host-microbe and microbe-microbe interactions. This review discusses ex vivo gastrointestinal models systems that can be used to gain mechanistic insights into the emergent properties of the host-microbial superorganism.
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Affiliation(s)
- Guus Roeselers
- TNO, Utrechtseweg 48, Zeist, 3704 HE Utrecht, The Netherlands.
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