1
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Sakamoto K, Matsumoto S, Abe N, Sentoku M, Yasuda K. Importance of Spatial Arrangement of Cardiomyocyte Network for Precise and Stable On-Chip Predictive Cardiotoxicity Measurement. MICROMACHINES 2023; 14:854. [PMID: 37421087 DOI: 10.3390/mi14040854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/13/2023] [Accepted: 04/13/2023] [Indexed: 07/09/2023]
Abstract
One of the advantages of human stem cell-derived cell-based preclinical screening is the reduction of the false negative/positive misjudgment of lead compounds for predicting their effectiveness and risks during the early stage of development. However, as the community effect of cells was neglected in the conventional single cell-based in vitro screening, the potential difference in results caused by the cell number and their spatial arrangement differences has not yet been sufficiently evaluated. Here, we have investigated the effect of the community size and spatial arrangement difference for cardiomyocyte network response against the proarrhythmic compounds from the viewpoint of in vitro cardiotoxicity. Using three different typical types of cell networks of cardiomyocytes, small cluster, large square sheet, and large closed-loop sheet were formed in shaped agarose microchambers fabricated on a multielectrode array chip simultaneously, and their responses were compared against the proarrhythmic compound, E-4031. The interspike intervals (ISIs) in large square sheets and closed-loop sheets were durable and maintained stable against E-4031 even at a high dose of 100 nM. In contrast, those in the small cluster, which fluctuated even without E-4031, acquired stable beating reflecting the antiarrhythmic efficacy of E-4031 from a 10 nM medium dose administration. The repolarization index, field potential duration (FPD), was prolonged in closed-loop sheets with 10 nM E-4031, even though small clusters and large sheets remained normal at this concentration. Moreover, FPDs of large sheets were the most durable against E-4031 among the three geometries of cardiomyocyte networks. The results showed the apparent spatial arrangement dependence on the stability of their interspike intervals, and FPD prolongation, indicating the importance of the geometry control of cell networks for representing the appropriate response of cardiomyocytes against the adequate amount of compounds for in vitro ion channel measurement.
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Affiliation(s)
- Kazufumi Sakamoto
- Department of Pure and Applied Physics, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
| | - Suguru Matsumoto
- Department of Pure and Applied Physics, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
| | - Nanami Abe
- Department of Pure and Applied Physics, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
| | - Mitsuru Sentoku
- Department of Pure and Applied Physics, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
| | - Kenji Yasuda
- Department of Pure and Applied Physics, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan
- Department of Physics, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
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2
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Bedoya M, Rinné S, Kiper AK, Decher N, González W, Ramírez D. TASK Channels Pharmacology: New Challenges in Drug Design. J Med Chem 2019; 62:10044-10058. [PMID: 31260312 DOI: 10.1021/acs.jmedchem.9b00248] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Rational drug design targeting ion channels is an exciting and always evolving research field. New medicinal chemistry strategies are being implemented to explore the wild chemical space and unravel the molecular basis of the ion channels modulators binding mechanisms. TASK channels belong to the two-pore domain potassium channel family and are modulated by extracellular acidosis. They are extensively distributed along the cardiovascular and central nervous systems, and their expression is up- and downregulated in different cancer types, which makes them an attractive therapeutic target. However, TASK channels remain unexplored, and drugs designed to target these channels are poorly selective. Here, we review TASK channels properties and their known blockers and activators, considering the new challenges in ion channels drug design and focusing on the implementation of computational methodologies in the drug discovery process.
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Affiliation(s)
- Mauricio Bedoya
- Centro de Bioinformática y Simulación Molecular (CBSM) , Universidad de Talca , 1 Poniente No. 1141 , 3460000 Talca , Chile
| | - Susanne Rinné
- Institute for Physiology and Pathophysiology, Vegetative Physiology and Marburg Center for Mind, Brain and Behavior, MCMBB , Philipps-University of Marburg , Deutschhausstraße 2 , Marburg 35037 , Germany
| | - Aytug K Kiper
- Institute for Physiology and Pathophysiology, Vegetative Physiology and Marburg Center for Mind, Brain and Behavior, MCMBB , Philipps-University of Marburg , Deutschhausstraße 2 , Marburg 35037 , Germany
| | - Niels Decher
- Institute for Physiology and Pathophysiology, Vegetative Physiology and Marburg Center for Mind, Brain and Behavior, MCMBB , Philipps-University of Marburg , Deutschhausstraße 2 , Marburg 35037 , Germany
| | - Wendy González
- Centro de Bioinformática y Simulación Molecular (CBSM) , Universidad de Talca , 1 Poniente No. 1141 , 3460000 Talca , Chile.,Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD) , Universidad de Talca , 1 Poniente No. 1141 , 3460000 Talca , Chile
| | - David Ramírez
- Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud , Universidad Autónoma de Chile , El Llano Subercaseaux 2801, Piso 6 , 8900000 Santiago , Chile
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3
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Mashimo Y, Yoshioka M, Tokunaga Y, Fockenberg C, Terada S, Koyama Y, Shibata-Seki T, Yoshimoto K, Sakai R, Hakariya H, Liu L, Akaike T, Kobatake E, How SE, Uesugi M, Chen Y, Kamei KI. Fabrication of a Multiplexed Artificial Cellular MicroEnvironment Array. J Vis Exp 2018. [PMID: 30247461 DOI: 10.3791/57377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cellular microenvironments consist of a variety of cues, such as growth factors, extracellular matrices, and intercellular interactions. These cues are well orchestrated and are crucial in regulating cell functions in a living system. Although a number of researchers have attempted to investigate the correlation between environmental factors and desired cellular functions, much remains unknown. This is largely due to the lack of a proper methodology to mimic such environmental cues in vitro, and simultaneously test different environmental cues on cells. Here, we report an integrated platform of microfluidic channels and a nanofiber array, followed by high-content single-cell analysis, to examine stem cell phenotypes altered by distinct environmental factors. To demonstrate the application of this platform, this study focuses on the phenotypes of self-renewing human pluripotent stem cells (hPSCs). Here, we present the preparation procedures for a nanofiber array and the microfluidic structure in the fabrication of a Multiplexed Artificial Cellular MicroEnvironment (MACME) array. Moreover, overall steps of the single-cell profiling, cell staining with multiple fluorescent markers, multiple fluorescence imaging, and statistical analyses, are described.
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Affiliation(s)
- Yasumasa Mashimo
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University; Department of Life Science and Technology, School of Life Science and Technology, Tokyo Institute of Technology
| | - Momoko Yoshioka
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | - Yumie Tokunaga
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | | | - Shiho Terada
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | - Yoshie Koyama
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | - Teiko Shibata-Seki
- Department of Life Science and Technology, School of Life Science and Technology, Tokyo Institute of Technology
| | - Koki Yoshimoto
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | - Risako Sakai
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | - Hayase Hakariya
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | - Li Liu
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
| | - Toshihiro Akaike
- Biomaterials Center for Regenerative Medical Engineering, Foundation for Advancement of International Science
| | - Eiry Kobatake
- Department of Life Science and Technology, School of Life Science and Technology, Tokyo Institute of Technology
| | - Siew-Eng How
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah
| | - Motonari Uesugi
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University; Institute for Chemical Research, Kyoto University
| | - Yong Chen
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University; Ecole Normale Supérieure
| | - Ken-Ichiro Kamei
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University;
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4
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Sun Y, Zhang X, Li H, Xu S, Zhang X, Liu Y, Han M, Wen J. Stemazole promotes survival and preserves stemness in human embryonic stem cells. FEBS J 2018; 285:531-541. [PMID: 29222853 DOI: 10.1111/febs.14355] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 11/15/2017] [Accepted: 12/05/2017] [Indexed: 12/13/2022]
Abstract
Human embryonic stem cells (hESCs) are extremely delicate, and survive poorly under suboptimal culture conditions, severely restricting long-term studies and practical applications. Thus, a protective agent that promotes stem cell survival is urgently needed. In this study, we evaluated the protective effects of stemazole in single-cell and starved hESC cultures. Colony formation was quantified by alkaline phosphatase and immunofluorescence staining, while apoptosis was assessed by flow cytometry and TUNEL assay. Expression of hESC and other stem cell markers was evaluated by western blot, RT-PCR, and qPCR. We found that stemazole enhanced clonal expansion from single cells in dose-dependent fashion and clearly decreased apoptosis from 54.1% to 25.2%. Furthermore, the drug reduced apoptosis from 43.6% to 8.4% over 15 h of starvation, with 66% of stemazole-treated cells remaining viable after 2 weeks of starvation. Importantly, starved cells protected with stemazole retained the same proliferation and differentiation properties as cells in normal culture. In conclusion, stemazole significantly promotes survival of stem cells in single-cell or starvation cultures without compromising stemness and pluripotency.
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Affiliation(s)
- Ying Sun
- Department of Cell Biology, Stem Cell Research Center, School of Basic Medical Sciences, Peking University Health Science Center, China.,Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, China
| | - Xiaoyan Zhang
- Department of Cell Biology, Stem Cell Research Center, School of Basic Medical Sciences, Peking University Health Science Center, China
| | - Huajun Li
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, China
| | - Shasha Xu
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, China
| | - Xiaoyan Zhang
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, Beijing Normal University, China
| | - Yinan Liu
- Department of Cell Biology, Stem Cell Research Center, School of Basic Medical Sciences, Peking University Health Science Center, China
| | - Mei Han
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, China
| | - Jinhua Wen
- Department of Cell Biology, Stem Cell Research Center, School of Basic Medical Sciences, Peking University Health Science Center, China
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5
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Application of standard cell cultures and 3D in vitro tissue models as an effective tool in drug design and development. Pharmacol Rep 2017. [DOI: 10.1016/j.pharep.2017.03.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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6
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Kamei KI, Mashimo Y, Yoshioka M, Tokunaga Y, Fockenberg C, Terada S, Koyama Y, Nakajima M, Shibata-Seki T, Liu L, Akaike T, Kobatake E, How SE, Uesugi M, Chen Y. Microfluidic-Nanofiber Hybrid Array for Screening of Cellular Microenvironments. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1603104. [PMID: 28272774 DOI: 10.1002/smll.201603104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 01/06/2017] [Indexed: 06/06/2023]
Abstract
Cellular microenvironments are generally sophisticated, but crucial for regulating the functions of human pluripotent stem cells (hPSCs). Despite tremendous effort in this field, the correlation between the environmental factors-especially the extracellular matrix and soluble cell factors-and the desired cellular functions remains largely unknown because of the lack of appropriate tools to recapitulate in vivo conditions and/or simultaneously evaluate the interplay of different environment factors. Here, a combinatorial platform is developed with integrated microfluidic channels and nanofibers, associated with a method of high-content single-cell analysis, to study the effects of environmental factors on stem cell phenotype. Particular attention is paid to the dependence of hPSC short-term self-renewal on the density and composition of extracellular matrices and initial cell seeding densities. Thus, this combinatorial approach provides insights into the underlying chemical and physical mechanisms that govern stem cell fate decisions.
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Affiliation(s)
- Ken-Ichiro Kamei
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yasumasa Mashimo
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
- Department of Environmental Chemistry and Engineering, Graduate School of Interdisciplinary Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan
| | - Momoko Yoshioka
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yumie Tokunaga
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Christopher Fockenberg
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Shiho Terada
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yoshie Koyama
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Minako Nakajima
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Teiko Shibata-Seki
- Department of Environmental Chemistry and Engineering, Graduate School of Interdisciplinary Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan
| | - Li Liu
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Toshihiro Akaike
- Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan
- Biomaterials Center for Regenerative Medical Engineering, Foundation for Advancement of International Science, Kasuga, Tsukuba-shi, Ibaraki, 305-0821, Japan
| | - Eiry Kobatake
- Department of Environmental Chemistry and Engineering, Graduate School of Interdisciplinary Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8501, Japan
| | - Siew-Eng How
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah, 88400, Malaysia
| | - Motonari Uesugi
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Yong Chen
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
- Ecole Normale Supérieure, CNRS-ENS-UPMC UMR 8640, 24 Rue Lhomond, Paris, 75005, France
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7
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Hunsberger JG, Efthymiou AG, Malik N, Behl M, Mead IL, Zeng X, Simeonov A, Rao M. Induced Pluripotent Stem Cell Models to Enable In Vitro Models for Screening in the Central Nervous System. Stem Cells Dev 2015; 24:1852-64. [PMID: 25794298 PMCID: PMC4533087 DOI: 10.1089/scd.2014.0531] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 03/20/2015] [Indexed: 12/23/2022] Open
Abstract
There is great need to develop more predictive drug discovery tools to identify new therapies to treat diseases of the central nervous system (CNS). Current nonpluripotent stem cell-based models often utilize non-CNS immortalized cell lines and do not enable the development of personalized models of disease. In this review, we discuss why in vitro models are necessary for translational research and outline the unique advantages of induced pluripotent stem cell (iPSC)-based models over those of current systems. We suggest that iPSC-based models can be patient specific and isogenic lines can be differentiated into many neural cell types for detailed comparisons. iPSC-derived cells can be combined to form small organoids, or large panels of lines can be developed that enable new forms of analysis. iPSC and embryonic stem cell-derived cells can be readily engineered to develop reporters for lineage studies or mechanism of action experiments further extending the utility of iPSC-based systems. We conclude by describing novel technologies that include strategies for the development of diversity panels, novel genomic engineering tools, new three-dimensional organoid systems, and modified high-content screens that may bring toxicology into the 21st century. The strategic integration of these technologies with the advantages of iPSC-derived cell technology, we believe, will be a paradigm shift for toxicology and drug discovery efforts.
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Affiliation(s)
| | | | - Nasir Malik
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, Maryland
| | - Mamta Behl
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina
| | - Ivy L. Mead
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, North Carolina
| | - Xianmin Zeng
- Buck Institute for Age Research, Novato, California
| | - Anton Simeonov
- National Center for Advancing Translational Sciences (NCATS), National Institutes of Health (NIH), Rockville, Maryland
| | - Mahendra Rao
- New York Stem Cell Foundation, New York, New York
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8
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Abstract
At present, animal-based models are the major test systems for assessing the tolerability and safety of chemical substances for regulatory purposes, and also for pivotal efficacy testing in pharmaceutical development. In spite of the high genetic similarity between many laboratory animals and humans, animal models are very poor predictors of human health effects and pathophysiological processes. Thus, models and testing strategies that are more relevant to human biology, are needed for these purposes. The best predictability is achieved with human organotypic models that mimic the microenvironment of human tissues. During their development, such models have to be characterised at the structural, genetic and functional levels, and compared to the respective human tissues. Their predictivity should be confirmed by using known reference chemicals with corresponding human data. The use of these methods in safety assessment and biomedical research, combined with the knowledge gained of the underlying biological processes on gene and protein expression, as well as on cellular signalling, will ultimately lead to better human science and animal welfare.
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Affiliation(s)
- Tuula Heinonen
- Finnish Centre for Alternative Methods, School of Medicine, University of Tampere, Finland
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9
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Kunze A, Steel D, Dahlenborg K, Sartipy P, Svedhem S. Non-Invasive Acoustical sensing of Drug-Induced Effects on the Contractile Machinery of Human Cardiomyocyte Clusters. PLoS One 2015; 10:e0125540. [PMID: 25961711 PMCID: PMC4427273 DOI: 10.1371/journal.pone.0125540] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 03/25/2015] [Indexed: 11/19/2022] Open
Abstract
There is an urgent need for improved models for cardiotoxicity testing. Here we propose acoustic sensing applied to beating human cardiomyocyte clusters for non-invasive, surrogate measuring of the QT interval and other characteristics of the contractile machinery. In experiments with the acoustic method quartz crystal microbalance with dissipation monitoring (QCM-D), the shape of the recorded signals was very similar to the extracellular field potential detected in electrochemical experiments, and the expected changes of the QT interval in response to addition of conventional drugs (E-4031 or nifedipine) were observed. Additionally, changes in the dissipation signal upon addition of cytochalasin D were in good agreement with the known, corresponding shortening of the contraction-relaxation time. These findings suggest that QCM-D has great potential as a tool for cardiotoxicological screening, where effects of compounds on the cardiomyocyte contractile machinery can be detected independently of whether the extracellular field potential is altered or not.
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Affiliation(s)
- Angelika Kunze
- Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden
| | | | | | - Peter Sartipy
- Cellectis AB, Göteborg, Sweden
- Systems Biology Research Center, School of Bioscience, University of Skövde, Skövde, Sweden
| | - Sofia Svedhem
- Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden
- * E-mail:
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10
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Kim YE, Park JA, Ha YW, Park SK, Kim HS, Oh SK, Lee Y. Chromosomal Modification in Human Embryonic Stem Cells Cultured in a Feeder-Free Condition after Single Cell Dissociation using Accutase. Dev Reprod 2015; 16:353-61. [PMID: 25949110 PMCID: PMC4282239 DOI: 10.12717/dr.2012.16.4.353] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 11/19/2012] [Accepted: 12/13/2012] [Indexed: 12/24/2022]
Abstract
Human embryonic stem (ES) cells are a potential source of cells for developmental studies and for a variety of applications in transplantation therapies and drug discovery. However, human ES cells are difficult to culture and maintain at a large scale, which is one of the most serious obstacles in human ES cell research. Culture of human ES cells on MEF cells after disassociation with accutase has previously been demonstrated by other research groups. Here, we confirmed that human ES cells (H9) can maintain stem cell properties when the cells are passaged as single cells under a feeder-free culture condition. Accutase-dissociated human ES cells showed normal karyotype, stem cell marker expression, and morphology. We prepared frozen stocks during the culture period, thawed two of the human ES cell stocks, and analyzed the cells after culture with the same method. Although the cells revealed normal expression of stem cell marker genes, they had abnormal karyotypes. Therefore, we suggest that accutase-dissociated single cells can be usefully expanded in a feeder-free condition but chromosomal modification should be considered in the culture after freeze-thawing.
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Affiliation(s)
- Young-Eun Kim
- Dept. of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 361-763, Korea ; Biotechnology Research Institute, Chungbuk National University, Cheongju 361-763, Korea
| | - Jeong-A Park
- Dept. of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 361-763, Korea
| | - Yang-Wha Ha
- Dept. of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 361-763, Korea
| | - Sang-Kyu Park
- Dept. of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 361-763, Korea
| | - Hee Sun Kim
- Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University, Seoul 110-799, Korea ; IVF Laboratory, Dept. of Obstetrics and Gynecology, Seoul National University Hospital, Seoul 110-744, Korea
| | - Sun Kyung Oh
- Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University, Seoul 110-799, Korea ; IVF Laboratory, Dept. of Obstetrics and Gynecology, Seoul National University Hospital, Seoul 110-744, Korea
| | - Younghee Lee
- Dept. of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 361-763, Korea ; Biotechnology Research Institute, Chungbuk National University, Cheongju 361-763, Korea
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11
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Kim YE, Park JA, Park SK, Kang HB, Kwon HJ, Lee Y. Enhancement of Transgene Expression by HDAC Inhibitors in Mouse Embryonic Stem Cells. Dev Reprod 2015; 17:379-87. [PMID: 25949154 PMCID: PMC4382945 DOI: 10.12717/dr.2013.17.4.379] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2013] [Revised: 12/07/2013] [Accepted: 12/13/2013] [Indexed: 12/04/2022]
Abstract
Embryonic stem (ES) cells can self-renew and differentiate to various cells depending on the culture condition. Although ES cells are a good model for cell type specification and can be useful for application in clinics in the future, studies on ES cells have many experimental restraints including low transfection efficiency and transgene expression. Here, we observed that transgene expression after transfection was enhanced by treatment with histone deacetylse (HDAC) inhibitors such as trichostatin A, sodium butyrate, and valproic acid. Transfection was performed using conventional transfection reagents with a retroviral vector encoding GFP under the control of CMV promoter as a reporter. Treatment of ES cells with HDAC inhibitors after transfection increased population of GFP positive cells up to 180% compared with untreated control. ES cells showed normal expression of stem cell markers after treatment with HDAC inhibitors. Transgene expression was further enhanced by modifying transfection procedure. GFP positive cells selected after transfection were proved to have the stem cell properties. Our improved protocol for enhanced gene delivery and expression in mouse ES cells without hampering ES cell properties will be useful for study and application of ES cells.
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Affiliation(s)
- Young-Eun Kim
- Department of Biochemistry, College of Natural Sciences, Republic of Korea ; Biotechnology Research Institute, Chungbuk National University, Cheongju 361-763, Republic of Korea
| | - Jeong-A Park
- Department of Biochemistry, College of Natural Sciences, Republic of Korea
| | - Sang-Kyu Park
- Department of Biochemistry, College of Natural Sciences, Republic of Korea
| | - Ho-Bum Kang
- Biotechnology Research Institute, Chungbuk National University, Cheongju 361-763, Republic of Korea
| | - Hyung-Joo Kwon
- Center for Medical Science Research, Republic of Korea ; Department of Microbiology, College of Medicine, Hallym University, Chuncheon 200-702, Republic of Korea
| | - Younghee Lee
- Department of Biochemistry, College of Natural Sciences, Republic of Korea ; Biotechnology Research Institute, Chungbuk National University, Cheongju 361-763, Republic of Korea
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12
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Abstract
Integration of physiologically relevant in vitro assays at the earliest stages of drug discovery may improve the likelihood of successfully translating preclinical discoveries to the clinic. Assays based on in vitro-differentiated, human pluripotent stem cell (IVD hPSC)-derived cells, which may better model human physiology, are starting to impact the drug discovery process, but their implementation has been slower than originally anticipated. In this Perspective, we discuss imperatives for incorporating IVD hPSCs into drug discovery and the associated challenges.
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Affiliation(s)
- Sandra J Engle
- Pharmacokinetics, Dynamics and Metabolism, Pfizer, Eastern Point Road, Groton, CT 06340, USA.
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13
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Zhang T, Wei D. Recent progress on structural bioinformatics research of cytochrome P450 and its impact on drug discovery. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 827:327-39. [PMID: 25387973 DOI: 10.1007/978-94-017-9245-5_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Cytochrome P450 is predominantly responsible for human drug metabolism, which is of critical importance for drug discovery and development. Structural bioinformatics focuses on analysis and prediction of three-dimentional structure of biological macromolecules and elucidation of structure-function relationship as well as identification of important binding interactions. Rapid advancement of structural bioinformatics has been made over the last decade. With more information available for CYP structures, the methods of structural bioinformatics may be used in the CYP field. In this review, we demonstrate three previous studies on CYP using the methods of structural bioinformatics, including the investigation of reasons for decrease of enzymatic activity of CYP1A2 caused by a peripheral mutation, the construction of a pharmacophore model specific to active site of CYP1A2 and the prediction of the functional consequences of single residue mutation in CYP. By illustrating these studies we attempt to show the potential role of structural bioinformatics in CYP research and help better understanding the importance of structural bioinformatics in drug designing.
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Affiliation(s)
- Tao Zhang
- State Key Laboratory of Microbial Metabolism, College of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China,
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14
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Abstract
This unit provides an overview of the principal electrophysiological techniques commonly used for the study of ionic currents and the ion channels that mediate them. These techniques include electroencephalograms (EEGs), electrocardiograms (ECGs), single- and multiunit extracellular recording, multielectrode arrays, transepithelial recording, impedance measurements, and current-clamp, voltage-clamp, patch-clamp, and lipid bilayer recording. The unit also discusses recent advances in high-throughput, automated electrophysiological techniques for drug discovery and the use of stem cells as a tissue source.
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Subramanian K, Owens DJ, Raju R, Firpo M, O'Brien TD, Verfaillie CM, Hu WS. Spheroid culture for enhanced differentiation of human embryonic stem cells to hepatocyte-like cells. Stem Cells Dev 2013; 23:124-31. [PMID: 24020366 DOI: 10.1089/scd.2013.0097] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Stem cell-derived hepatocyte-like cells hold great potential for the treatment of liver disease and for drug toxicity screening. The success of these applications hinges on the generation of differentiated cells with high liver specific activities. Many protocols have been developed to guide human embryonic stem cells (hESCs) to differentiate to the hepatic lineage. Here we report cultivation of hESCs as three-dimensional aggregates that enhances their differentiation to hepatocyte-like cells. Differentiation was first carried out in monolayer culture for 20 days. Subsequently cells were allowed to self-aggregate into spheroids. Significantly higher expression of liver-specific transcripts and proteins, including Albumin, phosphoenolpyruvate carboxykinase, and asialoglycoprotein receptor 1 was observed. The differentiated phenotype was sustained for more than 2 weeks in the three-dimensional spheroid culture system, significantly longer than in monolayer culture. Cells in spheroids exhibit morphological and ultrastructural characteristics of primary hepatocytes by scanning and transmission electron microscopy in addition to mature functions, such as biliary excretion of metabolic products and cytochrome P450 activities. This three-dimensional spheroid culture system may be appropriate for generating high quality, functional hepatocyte-like cells from ESCs.
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Affiliation(s)
- Kartik Subramanian
- 1 Department of Chemical Engineering and Materials Science, University of Minnesota , Minneapolis, Minnesota
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16
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Ivashchenko CY, Pipes GC, Lozinskaya IM, Lin Z, Xiaoping X, Needle S, Grygielko ET, Hu E, Toomey JR, Lepore JJ, Willette RN. Human-induced pluripotent stem cell-derived cardiomyocytes exhibit temporal changes in phenotype. Am J Physiol Heart Circ Physiol 2013; 305:H913-22. [PMID: 23832699 DOI: 10.1152/ajpheart.00819.2012] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Human-induced pluripotent stem cell-derived cardiomyocytes (hiPS-CMs) have been recently derived and are used for basic research, cardiotoxicity assessment, and phenotypic screening. However, the hiPS-CM phenotype is dependent on their derivation, age, and culture conditions, and there is disagreement as to what constitutes a functional hiPS-CM. The aim of the present study is to characterize the temporal changes in hiPS-CM phenotype by examining five determinants of cardiomyocyte function: gene expression, ion channel functionality, calcium cycling, metabolic activity, and responsiveness to cardioactive compounds. Based on both gene expression and electrophysiological properties, at day 30 of differentiation, hiPS-CMs are immature cells that, with time in culture, progressively develop a more mature phenotype without signs of dedifferentiation. This phenotype is characterized by adult-like gene expression patterns, action potentials exhibiting ventricular atrial and nodal properties, coordinated calcium cycling and beating, suggesting the formation of a functional syncytium. Pharmacological responses to pathological (endothelin-1), physiological (IGF-1), and autonomic (isoproterenol) stimuli similar to those characteristic of isolated adult cardiac myocytes are present in maturing hiPS-CMs. In addition, thyroid hormone treatment of hiPS-CMs attenuated the fetal gene expression in favor of a more adult-like pattern. Overall, hiPS-CMs progressively acquire functionality when maintained in culture for a prolonged period of time. The description of this evolving phenotype helps to identify optimal use of hiPS-CMs for a range of research applications.
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Affiliation(s)
- Christine Y Ivashchenko
- Heart Failure Discovery Performance Unit, Metabolic and Cardiovascular Therapeutic Area, GlaxoSmithKline, King of Prussia, Pennsylvania
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Tymchenko N, Kunze A, Dahlenborg K, Svedhem S, Steel D. Acoustical sensing of cardiomyocyte cluster beating. Biochem Biophys Res Commun 2013; 435:520-5. [DOI: 10.1016/j.bbrc.2013.04.070] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 04/25/2013] [Indexed: 02/08/2023]
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18
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Stem cells and small molecule screening: haploid embryonic stem cells as a new tool. Acta Pharmacol Sin 2013; 34:725-31. [PMID: 23645011 DOI: 10.1038/aps.2013.26] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Stem cells can both self-renew and differentiate into various cell types under certain conditions, which makes them a good model for development and disease studies. Recently, chemical approaches have been widely applied in stem cell biology by promoting stem cell self-renewal, proliferation, differentiation and somatic cell reprogramming using specific small molecules. Conversely, stem cells and their derivatives also provide an efficient and robust platform for small molecule and drug screening. Here, we review the current research and applications of small molecules that modulate stem cell self-renewal and differentiation and improve reprogramming, as well as the applications that use stem cells as a tool for small molecule screening. Moreover, we introduce the recent advance in haploid embryonic stem cells research. Haploid embryonic stem cells maintain haploidy and stable growth over extensive passages, possess the ability to differentiate into all three germ layers in vitro and in vivo, and contribute to the germlines of chimeras when injected into blastocysts. Androgenetic haploid stem cells can also be used in place of sperm to produce fertile progeny after intracytoplasmic injection into mature oocytes. Such characteristics demonstrate that haploid stem cells are a new approach for genetic studies at both the cellular and animal levels and that they are a valuable platform for future small molecule screening.
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Low VF, Faull RLM, Bennet L, Gunn AJ, Curtis MA. Neurogenesis and progenitor cell distribution in the subgranular zone and subventricular zone of the adult sheep brain. Neuroscience 2013; 244:173-87. [PMID: 23587842 DOI: 10.1016/j.neuroscience.2013.04.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 04/02/2013] [Accepted: 04/04/2013] [Indexed: 12/11/2022]
Abstract
Progenitor cell proliferation is ubiquitous in the subventricular zone (SVZ) and subgranular zone (SGZ) of adult mammalian brains, however, the abundance and distribution of proliferation are surprisingly heterogeneous between species. In rodents, proliferation is high in both the SVZ and SGZ, while in humans proliferation is prominent in the SVZ but limited in the SGZ. To accurately study proliferation and how it changes in human disease, we should focus on animals in which the patterns of proliferation are consistent with the human brain. In this study, we characterized the neurogenic niches of the adult sheep, an animal model with a longer lifespan than rodents and a highly gyrencephalic brain, using 5-bromo-2'-deoxyuridine (BrdU) as a mitotic marker and neuronal nuclear antigen to identify neuronal lineage cells. Our study demonstrates that the sheep SVZ is organized into the same distinct layers that are comparable to what has been described in humans. The rate of maturation of new neurons was slower in sheep than in previous reports in rodents, with only 20% of BrdU-positive cells showing neuronal phenotype after 4 months survival following BrdU administration. Most importantly, as in the human, there was much greater proliferation in the sheep SVZ than in the SGZ. These results suggest that the sheep is a better basis for comparisons with human SVZ and SGZ neurogenesis than rodents.
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Affiliation(s)
- V F Low
- Department of Anatomy with Radiology, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand
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20
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Jonsson MK, van Veen TA, Goumans MJ, Vos MA, Duker G, Sartipy P. Improvement of cardiac efficacy and safety models in drug discovery by the use of stem cell-derived cardiomyocytes. Expert Opin Drug Discov 2013; 4:357-72. [PMID: 23485039 DOI: 10.1517/17460440902794912] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND The pharmaceutical industry suffers from high attrition rates during late phases of drug development. Improved models for early evaluation of drug efficacy and safety are needed to address this problem. Recent developments have illustrated that human stem cell-derived cardiomyocytes are attractive for using as a model system for different cardiac diseases and as a model for screening, safety pharmacology and toxicology. OBJECTIVE In this review, we discuss contemporary drug discovery models and their characteristics for cardiac efficacy testing and safety assessment. Additionally, we evaluate various sources of stem cells and how these cells could potentially improve early screening and safety models. CONCLUSION We conclude that human stem cells offer a source of physiologically relevant cells that show great potential as a future tool in cardiac drug discovery. However, some technical challenges related to cell differentiation and production and also to validation of improved platforms remain and must be overcome before successful application can become a reality.
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Affiliation(s)
- Malin Kb Jonsson
- University Medical Center Utrecht, Division Heart & Lungs, Department of Medical Physiology, Yalelaan 50, 3584 CM Utrecht, The Netherlands +46 31 7065571 ; +46 31 7763766 ;
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21
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O'Connor MD. The 3R principle: advancing clinical application of human pluripotent stem cells. Stem Cell Res Ther 2013; 4:21. [PMID: 23510719 PMCID: PMC3706962 DOI: 10.1186/scrt169] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The first derivation of human embryonic stem cells brought with it a clear understanding that animal models of human disease might be replaced by an unlimited supply of human cells for research, drug discovery, and drug development. With the advent of clinical trials using human pluripotent stem cell-based therapies, it is both timely and relevant to reflect on factors that will facilitate future translation of this technology. Human pluripotent cells are increasingly being used to investigate the molecular mechanisms that underpin normal and pathological human development. Their differentiated progeny are also being used to identify novel pharmaceuticals, to screen for toxic effects of known chemicals, and to investigate cell or tissue transplantation strategies. The intrinsic assumption of these research efforts is that the information gained from these studies will be more accurate, and therefore of greater relevance, than traditional investigations based on animal models of human disease and injury. This review will therefore evaluate how animals and animal-derived products are used for human pluripotent stem cell research, and will indicate how efforts to further reduce or remove animals and animal products from this research will increase the clinical translation of human pluripotent stem cell technologies through drug discovery, toxicology screening, and cell replacement therapies.
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22
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Abstract
In the field of regenerative medicine, the development of induced pluripotent stem (iPS) cells may represent a potential strategy to overcome the limitations of human embryonic stem cells (ESCs). iPS cells have the potential to mimic human disease, since they carry the genome of the donor. Hypothetically, with iPS cell technology it is possible to screen patients for a genetic cause of disease (genetic mutation), develop cell lines, reprogram them back to iPS cells, finally differentiate them into one or more cell types that develop the disease. Although the creation of multiple lineages with iPS cells can seem limitless, a number of challenges need to be addressed in order to effectively use these cell lines for disease modeling. These include the low efficiency of iPS cell generation without genetic alterations, the possibility of tumor formation in vivo, the random integration of retroviral-based delivery vectors into the genome, and unregulated growth of the remaining cells that are partially reprogrammed and refractory to differentiation. The establishment of protein or RNA-based reprogramming strategies will help generate human iPS cells without permanent genetic alterations. Finally, direct reprogramming strategies can provide rapid production of models of human "diseases in a dish", without first passing the cells through a pluripotent state, so avoiding the challenges of time-consumming and labor-intensive iPS cell line generation. This review will overview methods to develop iPS cells, current strategies for direct reprogramming, and main applications of iPS cells as human disease model, focusing on human cardiovascular diseases, with the aim to be a potential information resource for biomedical scientists and clinicians who exploit or intend to exploit iPS cell technology in a range of applications.
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Affiliation(s)
- Rosalinda Madonna
- Institute of Cardiology, G. d'Annunzio University-Chieti, C/o Ospedale SS. Annunziata Via dei Vestini, 66013 Chieti, Italy.
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Chen CS, Biasca M, Le C, Chen EYT, Hirleman ED, Chin WC. Determine the quality of human embryonic stem colonies with laser light scattering patterns. Biol Proced Online 2013; 15:2. [PMID: 23316759 PMCID: PMC3560278 DOI: 10.1186/1480-9222-15-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 01/05/2013] [Indexed: 12/02/2022] Open
Abstract
Background With the prompt developments of regenerative medicine, the potential clinical applications of human embryonic stem cells have attracted intense attention. However, the labor-intensive and complex manual cell selection processes required during embryonic stem cell culturing have seriously limited large-scale production and broad applications. Thus, availability of a label-free, non-invasive platform to replace the current cumbersome manual selection has become a critical need. Results A non-invasive, label-free, and time-efficient optical platform for determining the quality of human embryonic stem cell colonies was developed by analyzing the scattering signals from those stem cell colonies. Additionally, confocal microscopy revealed that the cell colony morphology and surface structures were correlated with the resulting characteristic light scattering patterns. Standard immunostaining assay (Oct-4) was also utilized to validate the quality-determination from this light scattering protocol. The platform developed here can therefore provide identification accuracy of up to 87% for colony determination. Conclusions Our study here demonstrated that light scattering patterns can serve as a feasible alternative approach to replace conventional manual selection for human embryonic stem cell cultures.
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Affiliation(s)
- Chi-Shuo Chen
- Bioengineering, School of Engineering, University of California, Merced, CA, USA.
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24
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Abstract
Induced pluripotent stem cells (iPSCs) hold great hopes for therapeutic application in various diseases. Although ongoing research is dedicated to achieving clinical translation of iPSCs, further understanding of the mechanisms that underlie complex pathogenic conditions is required. Compared with other classical models for studying diseases, iPSCs provide considerable advantages. A newly emerging application of iPSCs is in vitro disease modeling, which can significantly improve the never-ending search for new pharmacological cures. Here, we will discuss current efforts to create iPSC-dependent patient-specific disease models. Furthermore, we will review the use of iPSCs for development and testing of new therapeutic agents and the implications for high-throughput drug screening.
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Affiliation(s)
- Antje D. Ebert
- Department of Medicine (Division of Cardiology), Stanford University, Stanford, California, USA
- Department of Radiology, Molecular Imaging Program at Stanford (MIPS), Stanford University, Stanford, California, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, California, USA
| | - Ping Liang
- Department of Medicine (Division of Cardiology), Stanford University, Stanford, California, USA
- Department of Radiology, Molecular Imaging Program at Stanford (MIPS), Stanford University, Stanford, California, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, California, USA
| | - Joseph C. Wu
- Department of Medicine (Division of Cardiology), Stanford University, Stanford, California, USA
- Department of Radiology, Molecular Imaging Program at Stanford (MIPS), Stanford University, Stanford, California, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, California, USA
- Stanford Cardiovascular Institute, Stanford University, Stanford, California, USA
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25
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Abstract
Ion channels are targets of many therapeutically useful agents, and worldwide sales of ion channel-targeted drugs are estimated to be approximately US$12 billion. Nevertheless, considering that over 400 genes encoding ion channel subunits have been identified, ion channels remain significantly under-exploited as therapeutic targets. This is at least partly due to limitations in high-throughput assay technologies that support screening and lead optimization. Will the recent developments in automated electrophysiology rectify this situation? What are the other major limitations and can they be overcome? In this article, we review the status of ion channel drug discovery, discuss current challenges and propose alternative approaches that may facilitate the discovery of new drugs in the future.
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Fernández M, Pirondi S, Chen BL, Del Vecchio G, Alessandri M, Farnedi A, Pession A, Feki A, Jaconi MEE, Calzà L. Isolation of rat embryonic stem-like cells: a tool for stem cell research and drug discovery. Dev Dyn 2012; 240:2482-94. [PMID: 22012593 DOI: 10.1002/dvdy.22761] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The establishment of rat embryonic stem cells constitutes a precious tool since rat has been extensively used in biomedical research, in particular for the generation of human neurodisease animal models. Up to now only a few studies have described the isolation of rat embryonic stem-like cells. One out of 9 isolated rat embryonic stem-like cell lines (B1-RESC) obtained from a 4.5-day post-coitum blastocyst were extensively characterized and kept in culture for up to 80 passages on feeders with LIF. The stable growth of these cells and the expression of pluripotent markers were confirmed up to a high number of passages in culture, also in the absence of feeders and LIF. B1-RESC expresses the three germ layers markers both in vitro, within differentiating embryoid bodies, and in vivo through teratoma formation. Collectively, the B1-RESC line with a stable near-diploid karyotype can be used as a highly sensitive tool for testing anti-proliferative molecules.
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Affiliation(s)
- M Fernández
- Health Science and Technology Interdepartmental Center for Industrial Research, University of Bologna, Ozzano Emilia, Bologna, Italy.
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Stefanova VT, Grifo JA, Hansis C. Derivation of novel genetically diverse human embryonic stem cell lines. Stem Cells Dev 2012; 21:1559-70. [PMID: 22204497 DOI: 10.1089/scd.2011.0642] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Human embryonic stem cells (hESCs) have the potential to revolutionize many biomedical fields ranging from basic research to disease modeling, regenerative medicine, drug discovery, and toxicity testing. A multitude of hESC lines have been derived worldwide since the first 5 lines by Thomson et al. 13 years ago, but many of these are poorly characterized, unavailable, or do not represent desired traits, thus making them unsuitable for application purposes. In order to provide the scientific community with better options, we have derived 12 new hESC lines at New York University from discarded genetically normal and abnormal embryos using the latest techniques. We examined the genetic status of the NYUES lines in detail as well as their molecular and cellular features and DNA fingerprinting profile. Furthermore, we differentiated our hESCs into the tissues most affected by a specific condition or into clinically desired cell types. To our knowledge, a number of characteristics of our hESCs have not been previously reported, for example, mutation for alpha thalassemia X-linked mental retardation syndrome, linkage to conditions with a genetic component such as asthma or poor sperm morphology, and novel combinations of ethnic backgrounds. Importantly, all of our undifferentiated euploid female lines tested to date did not show X chromosome inactivation, believed to result in superior potency. We continue to derive new hESC lines and add them to the NIH registry and other registries. This should facilitate the use of our hESCs and lead to advancements for patient-benefitting applications.
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Affiliation(s)
- Valentina T Stefanova
- Department of Obstetrics and Gynecology, New York University School of Medicine, New York, New York, USA
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Lanier M, Schade D, Willems E, Tsuda M, Spiering S, Kalisiak J, Mercola M, Cashman JR. Wnt inhibition correlates with human embryonic stem cell cardiomyogenesis: a structure-activity relationship study based on inhibitors for the Wnt response. J Med Chem 2012; 55:697-708. [PMID: 22191557 DOI: 10.1021/jm2010223] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Human embryonic stem cell-based high-content screening of 550 known signal transduction modulators showed that one "lead" (1, a recently described inhibitor of the proteolytic degradation of Axin) stimulated cardiomyogenesis. Because Axin controls canonical Wnt signaling, we conducted an investigation to determine whether the cardiogenic activity of 1 is Wnt-dependent, and we developed a structure-activity relationship to optimize the cardiogenic properties of 1. We prepared analogues with a range of potencies (low nanomolar to inactive) for Wnt/β-catenin inhibition and for cardiogenic induction. Both functional activities correlated positively (r(2) = 0.72). The optimal compounds induced cardiogenesis 1.5-fold greater than 1 at 30-fold lower concentrations. In contrast, no correlation was observed for cardiogenesis and modulation of transforming growth factor β (TGFβ)/Smad signaling that prominently influences cardiogenesis. Taken together, these data show that Wnt signaling inhibition is essential for cardiogenic activity and that the pathway can be targeted for the design of druglike cardiogenic molecules.
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Affiliation(s)
- Marion Lanier
- Human BioMolecular Research Institute, 5310 Eastgate Mall, San Diego, California 92121-2804, United States.
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29
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Möller C. Keeping the rhythm: hERG and beyond in cardiovascular safety pharmacology. Expert Rev Clin Pharmacol 2012; 3:321-9. [PMID: 22111613 DOI: 10.1586/ecp.10.24] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Following its involvement in life-threatening cardiac arrhythmias, the catchword 'hERG' has become infamous in the drug discovery community. The blockade of the ion channel coded by the human ether-á-go-go-related gene (hERG) has been correlated to a prolongation of the QT interval in the ECG, which again is correlated to a potential risk of a life-threatening polymorphic ventricular tachycardia - torsades de pointes (TdP). Therefore, in vitro investigations for blockade of this ion channel have become a standard, starting early in most drug discovery projects and often accompanying the whole project; at some stage, scientists in many medicinal chemistry programs have to deal with hERG channel liabilities. Data for the compound effects on hERG channel activity are generally part of the safety pharmacology risk assessment in regulatory submissions and, at this stage, are ideally conducted in compliance with good laboratory practice. With the withdrawal of clobutinol from the market, owing to its perceived risk of introducing TdP, the importance of the hERG channel has very recently been reconfirmed. Despite being of such importance for drug discovery, the relevance and impact of hERG data are sometimes misinterpreted, as there are drugs that block the hERG-coded ion channel but do not cause TdP, and drugs that cause TdP but do not block the hERG channel. This review aims to provide an overview of TdP, including the cardiac action potential and the ion channels involved in it, as well as on the relevance and interpretation of in vitro hERG channel data and their impact for drug discovery projects. Finally, novel cardiac safety test systems beyond in vitro hERG channel screening are discussed.
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Affiliation(s)
- Clemens Möller
- Evotec AG, Discovery Alliances, Schnackenburgallee 114, Hamburg, Germany.
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Heng BC, Li J, Chen AKL, Reuveny S, Cool SM, Birch WR, Oh SKW. Translating human embryonic stem cells from 2-dimensional to 3-dimensional cultures in a defined medium on laminin- and vitronectin-coated surfaces. Stem Cells Dev 2011; 21:1701-15. [PMID: 22034857 DOI: 10.1089/scd.2011.0509] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
While defining the environment for human embryonic stem cell (hESC) culture on 2-dimensional (2D) surfaces has made rapid progress, the industrial-scale implementation of this technology will benefit from translating this knowledge into a 3-dimensional (3D) system, thus enabling better control, automation, and volumetric scale-up in bioreactors. The current study describes a system with defined conditions that are capable of supporting the long-term 2D culture of hESCs and the transposing of these conditions to 3D microcarrier (MC) cultures. Vitronectin (VN) and laminin (LN) were chosen as matrices for the long-term propagation of hESCs in a defined culture medium (STEMPRO(®)) for conventional 2D culture. Adsorption of these proteins onto 2D tissue culture polystyrene (TCPS) indicated that surface density saturation of 510 and 850 ng/cm(2) for VN and LN, respectively, was attained above 20 μg/mL deposition solution concentration. Adsorption of these proteins onto spherical (97±10 μm), polystyrene MC followed a similar trend and coating surface densities of 450 and 650 ng/cm(2) for VN and LN, respectively, were used to support hESC propagation. The long-term expansion of hESCs was equally successful on TCPS and MC, with consistently high expression (>90%) of pluripotent markers (OCT-4, MAB-84, and TRA-1-60) over 20 passages and maintenance of karyotypic normality. The average fold increase in cell numbers on VN-coated MC per serial passage was 8.5±1.0, which was similar to LN-coated MC (8.5±0.9). Embryoid body differentiation assays and teratoma formation confirmed that hESCs retained the ability to differentiate into lineages of all 3 germ layers, thus demonstrating the first translation to a fully defined MC-based environment for the expansion of hESCs.
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Affiliation(s)
- Boon Chin Heng
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
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31
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Arno A, Smith AH, Blit PH, Shehab MA, Gauglitz GG, Jeschke MG. Stem Cell Therapy: A New Treatment for Burns? Pharmaceuticals (Basel) 2011; 4:1355-1380. [PMID: 27721328 PMCID: PMC4060129 DOI: 10.3390/ph4101355] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 09/21/2011] [Accepted: 10/10/2011] [Indexed: 12/12/2022] Open
Abstract
Stem cell therapy has emerged as a promising new approach in almost every medicine specialty. This vast, heterogeneous family of cells are now both naturally (embryonic and adult stem cells) or artificially obtained (induced pluripotent stem cells or iPSCs) and their fates have become increasingly controllable, thanks to ongoing research in this passionate new field. We are at the beginning of a new era in medicine, with multiple applications for stem cell therapy, not only as a monotherapy, but also as an adjunct to other strategies, such as organ transplantation or standard drug treatment. Regrettably, serious preclinical concerns remain and differentiation, cell fusion, senescence and signalling crosstalk with growth factors and biomaterials are still challenges for this promising multidisciplinary therapeutic modality. Severe burns have several indications for stem cell therapy, including enhancement of wound healing, replacement of damaged skin and perfect skin regeneration - incorporating skin appendages and reduced fibrosis -, as well as systemic effects, such as inflammation, hypermetabolism and immunosuppression. The aim of this review is to describe well established characteristics of stem cells and to delineate new advances in the stem cell field, in the context of burn injury and wound healing.
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Affiliation(s)
- Anna Arno
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
- Plastic Surgery Department and Burn Unit, Vall d'Hebron University Hospital, Autonomous University of Barcelona, Passeig de la Vall d'Hebron 119-129, 08035, Barcelona, Spain
| | - Alexandra H Smith
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
| | - Patrick H Blit
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
| | - Mohammed Al Shehab
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
| | - Gerd G Gauglitz
- Department of Dermatology and Allergology, Ludwig Maximilians University, Geschwister-Scholl-Platz 1, 80539, Munich, Germany
| | - Marc G Jeschke
- Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada.
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Coopman K. Large-scale compatible methods for the preservation of human embryonic stem cells: Current perspectives. Biotechnol Prog 2011; 27:1511-21. [DOI: 10.1002/btpr.680] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Welling MM, Duijvestein M, Signore A, van der Weerd L. In vivo biodistribution of stem cells using molecular nuclear medicine imaging. J Cell Physiol 2011; 226:1444-52. [PMID: 21413018 DOI: 10.1002/jcp.22539] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Studies on stem cell are rapidly developing since these cells have great therapeutic potential for numerous diseases and has generated much promise as well as confusion due to contradictory results. Major questions in this research field have been raised as to how and in which numbers stem cells home to target tissues after administration, whether the cells engraft and differentiate, and what their long-term fate is. To answer these questions, reliable in vivo tracking techniques are essential. In vivo molecular imaging techniques using magnetic resonance imaging, bioluminescence, and scintigraphy have been applied for this purpose in experimental studies. The aim of this review is to discuss various radiolabeling techniques for early stem cell tracking, the need for validation of viability and performance of the cells after labeling, and the routes of administration in experimental animal models. In addition, we evaluate current problems and directions related to stem cell tracking using radiolabels, including a possible role for their clinical implementation.
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Affiliation(s)
- Mick M Welling
- Department of Radiology, Molecular Imaging Laboratories Leiden, Section Nuclear Medicine, Leiden University Medical Center, Leiden, Netherlands.
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Alfred R, Radford J, Fan J, Boon K, Krawetz R, Rancourt D, Kallos MS. Efficient suspension bioreactor expansion of murine embryonic stem cells on microcarriers in serum-free medium. Biotechnol Prog 2011; 27:811-23. [DOI: 10.1002/btpr.591] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Revised: 01/31/2011] [Indexed: 12/15/2022]
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Pal R, Mamidi MK, Kumar Das A, Bhonde R. Human embryonic stem cell proliferation and differentiation as parameters to evaluate developmental toxicity. J Cell Physiol 2011; 226:1583-95. [DOI: 10.1002/jcp.22484] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Giri S, Bader A. Improved preclinical safety assessment using micro-BAL devices: the potential impact on human discovery and drug attrition. Drug Discov Today 2011; 16:382-97. [PMID: 21354326 DOI: 10.1016/j.drudis.2011.02.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2010] [Revised: 01/11/2011] [Accepted: 02/21/2011] [Indexed: 02/07/2023]
Abstract
Hepatotoxicity is often unpredictable in the early phase of drug discovery and leads to drug attrition in preclinical and clinical development. Here, we discuss the conventional preclinical liver models that do not mimic in vivo livers. We focus on key components such as new sources of hepatocyte-derived human stem cells, enhanced direct oxygenation, defined biocompatibility nanoscaffolds, organotypical cellular models, dynamic culture, and metabolite status inside and outside the cell for effective configuration for the development of a bioartificial liver (BAL) device to mimic the in vivo liver microenvironment. The potential for development of BAL devices could open up new avenues in: (i) hepatotoxicity assessment for selecting drug candidates during preclinical screening; and (ii) therapeutic approaches for liver cell therapy at the clinical stage.
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Affiliation(s)
- Shibashish Giri
- Centre for Biotechnology and Biomedicine, Department of Cell Techniques and Applied Stem Cell Biology, University of Leipzig, Deutscher Platz 5, D-04103 Leipzig, Germany.
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Characterisation of human embryonic stem cells conditioning media by 1H-nuclear magnetic resonance spectroscopy. PLoS One 2011; 6:e16732. [PMID: 21347425 PMCID: PMC3036660 DOI: 10.1371/journal.pone.0016732] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Accepted: 12/28/2010] [Indexed: 12/19/2022] Open
Abstract
Background Cell culture media conditioned by human foreskin fibroblasts (HFFs) provide a complex supplement of protein and metabolic factors that support in vitro proliferation of human embryonic stem cells (hESCs). However, the conditioning process is variable with different media batches often exhibiting differing capacities to maintain hESCs in culture. While recent studies have examined the protein complement of conditioned culture media, detailed information regarding the metabolic component of this media is lacking. Methodology/Principal Findings Using a 1H-Nuclear Magnetic Resonance (1H-NMR) metabonomics approach, 32 metabolites and small compounds were identified and quantified in media conditioned by passage 11 HFFs (CMp11). A number of metabolites were secreted by HFFs with significantly higher concentration of lactate, alanine, and formate detected in CMp11 compared to non-conditioned media. In contrast, levels of tryptophan, folate and niacinamide were depleted in CMp11 indicating the utilisation of these metabolites by HFFs. Multivariate statistical analysis of the 1H-NMR data revealed marked age-related differences in the metabolic profile of CMp11 collected from HFFs every 24 h over 72 h. Additionally, the metabolic profile of CMp11 was altered following freezing at −20°C for 2 weeks. CM derived from passage 18 HFFs (CMp18) was found to be ineffective at supporting hESCs in an undifferentiated state beyond 5 days culture. Multivariate statistical comparison of CMp11 and CMp18 metabolic profiles enabled rapid and clear discrimination between the two media with CMp18 containing lower concentrations of lactate and alanine as well as higher concentrations of glucose and glutamine. Conclusions/Significance 1H-NMR-based metabonomics offers a rapid and accurate method of characterising hESC conditioning media and is a valuable tool for monitoring, controlling and optimising hESC culture media preparation.
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Hong H, Yang Y, Zhang Y, Cai W. Non-invasive imaging of human embryonic stem cells. Curr Pharm Biotechnol 2011; 11:685-92. [PMID: 20497109 DOI: 10.2174/138920110792246500] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Accepted: 03/29/2010] [Indexed: 11/22/2022]
Abstract
Human embryonic stem cells (hESCs) hold tremendous therapeutic potential in a variety of diseases. Over the last decade, non-invasive imaging techniques have proven to be of great value in tracking transplanted hESCs. This review article will briefly summarize the various techniques used for non-invasive imaging of hESCs, which include magnetic resonance imaging (MRI), bioluminescence imaging (BLI), fluorescence, single-photon emission computed tomography (SPECT), positron emission tomography (PET), and multimodality approaches. Although the focus of this review article is primarily on hESCs, the labeling/tracking strategies described here can be readily applied to other (stem) cell types as well. Non-invasive imaging can provide convenient means to monitor hESC survival, proliferation, function, as well as overgrowth (such as teratoma formation), which could not be readily investigated previously. The requirement for hESC tracking techniques depends on the clinical scenario and each imaging technique will have its own niche in preclinical/clinical research. Continued evolvement of non-invasive imaging techniques will undoubtedly contribute to significant advances in understanding stem cell biology and mechanisms of action.
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Affiliation(s)
- Hao Hong
- Department of Radiology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI 53705-2275, USA
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Synnergren J, Heins N, Brolén G, Eriksson G, Lindahl A, Hyllner J, Olsson B, Sartipy P, Björquist P. Transcriptional profiling of human embryonic stem cells differentiating to definitive and primitive endoderm and further toward the hepatic lineage. Stem Cells Dev 2010; 19:961-78. [PMID: 19757991 DOI: 10.1089/scd.2009.0220] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Human embryonic stem cells (hESC) can differentiate into a variety of specialized cell types, and they constitute a useful model system to study embryonic development in vitro. In order to fully utilize the potential of these cells, the mechanisms that regulate the developmental processes of specific lineage differentiation need to be better defined. The aim of this study was to explore the molecular program involved in the differentiation of hESC toward definitive endoderm (DE) and further into the hepatic lineage, and to compare that with primitive endoderm (PrE) differentiation. To that end, we applied two protocols: a specific DE differentiation protocol and an intrinsic differentiation protocol that mainly mediates PrE formation. We collected hESC, hESC-derived DE, DE-derived hepatocyte-progenitors (DE-Prog), DE-derived hepatocyte-like cells (DE-Hep), and the corresponding PrE derivatives. The samples were analyzed using microarrays, and we identified sets of genes that were exclusively up-regulated in DE derivatives (compared to PrE derivatives) at discrete developmental stages. We also investigated known protein interactions among the set of up-regulated genes in DE-Hep. The results demonstrate important differences between DE and PrE differentiation on the transcriptional level. In particular, our results identify a unique molecular program, exclusively activated during development of DE and the subsequent differentiation of DE toward the hepatic lineage. We identified key genes and pathways of potential importance for future efforts to improve hepatic differentiation from hESC. These results reveal new opportunities for rational design of specific interventions with the purpose of generating enriched populations of DE derivatives, including functional hepatocytes.
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Affiliation(s)
- Jane Synnergren
- School of Life Sciences, University of Skövde , Skövde, Sweden.
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40
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Jones MB, Chu CH, Pendleton JC, Betenbaugh MJ, Shiloach J, Baljinnyam B, Rubin JS, Shamblott MJ. Proliferation and pluripotency of human embryonic stem cells maintained on type I collagen. Stem Cells Dev 2010; 19:1923-35. [PMID: 20367282 DOI: 10.1089/scd.2009.0326] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Human embryonic stem cells (hESC) require a balance of growth factors and signaling molecules to proliferate and retain pluripotency. Conditioned medium (CM) from a human embryonic germ-cell-derived cell culture, SDEC, was observed to support the growth of hESC on type I collagen (COL I) and on Matrigel (MAT) biomatricies. After 1 month, the population doubling of hESC grown in SDEC CM on COL I was equivalent to that of hESC grown in mouse embryonic fibroblast (MEF) CM on MAT. hESC grown in SDEC CM on COL I expressed OCT4, NANOG, SSEA-4, alkaline phosphatase (AP), and TRA-1-60; retained a normal karyotype; and were capable of forming teratomas. DNA microarray analysis was used to compare the transcriptional profiles of SDEC and the less supportive WI38 and Detroit 551 human cell lines. The mRNA level of secreted frizzled-related protein (sFRP-1), a known antagonist of the WNT/β-catenin signaling pathway, was significantly reduced in SDEC as compared with the other 2 cell lines, whereas the mRNA levels of prostaglandin-endoperoxide synthase 2 (PTGS2 or COX-2) and prostaglandin I₂ synthase (PGIS), two prostaglandin biosynthesis genes, were significantly increased in SDEC. The level of sFRP-1 protein was significantly reduced, and levels of 2 prostaglandins that are downstream products of PTGS2 and PGIS, prostaglandin E₂ and 6-keto-prostaglandin F(1α), were significantly elevated in SDEC CM compared with WI38, Detroit 551, and MEF CM. Further, addition of purified sFRP-1 to SDEC CM reduced the proliferation of hESC grown on COL I as well as MAT in a dose-dependent manner.
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Affiliation(s)
- Meredith B Jones
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
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Synnergren J, Améen C, Lindahl A, Olsson B, Sartipy P. Expression of microRNAs and their target mRNAs in human stem cell-derived cardiomyocyte clusters and in heart tissue. Physiol Genomics 2010; 43:581-94. [PMID: 20841501 DOI: 10.1152/physiolgenomics.00074.2010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Recent studies have shown that microRNAs (miRNAs) act as posttranscriptional regulators and that they play important roles during heart development and in cardiac function. Thus, they may provide new means of altering stem cell fate and differentiation processes. However, information about the correlation between global miRNA and mRNA expression in cardiomyocyte clusters (CMCs) derived from human embryonic stem cells (hESC) and in fetal and adult heart tissue is lacking. In the present study the global miRNA and mRNA expression in hESC-derived CMCs and in fetal and adult heart tissue was investigated in parallel using microarrays. Target genes for the differentially expressed miRNAs were predicted using computational methods, and the concordance in miRNA expression and mRNA levels of potential target genes was determined across the experimental samples. The biology of the predicted target genes was further explored regarding their molecular functions and involvement in known regulatory pathways. A clear correlation between the global miRNA expression and corresponding target mRNA expression was observed. Using three different sources of cardiac tissue-like samples, we defined the similarities between in vitro hESC-derived CMCs and their in vivo counterparts. The results are in line with previously reported observations that miRNAs repress mRNA expression and additionally identify a number of novel miRNAs with potential important roles in human cardiac tissue. The concordant miRNA expression pattern observed among all the cardiac tissue-like samples analyzed here provide a starting point for future ambitious studies aiming towards assessment of the functional roles of specific miRNAs during cardiomyocyte differentiation.
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Affiliation(s)
- Jane Synnergren
- School of Life Sciences, University of Skövde, Skövde, Sweden.
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Abstract
Human pluripotent stem cells are a biological resource most commonly considered for their potential in cell therapy or, as it is now called, ‘regenerative medicine’. However, in the near future, their most important application for human health may well be totally different, as they are more and more envisioned as opening new routes for pharmacological research. Pluripotent stem cells indeed possess the main attributes that make them theoretically fully equipped for the development of cell-based assays in the fields of drug discovery and predictive toxicology. These cells are characterized by: (i) an unlimited self-renewal capacity, which make them an inexhaustible source of cells; (ii) the potential to differentiate into any cell phenotype of the body at any stage of differentiation, with probably the notable exception, however, of the most mature forms of many lineages; and (iii) the ability to express genotypes of interest via the selection of donors, whether they be of embryonic origin, through pre-implantation genetic diagnosis, or adults, by genetic reprogramming of somatic cells, so-called iPSCs (induced pluripotent stem cells). In the present review, we provide diverse illustrations of the use of pluripotent stem cells in drug discovery and predictive toxicology, using either human embryonic stem cell lines or iPSC lines.
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43
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Isolation, differentiation and characterization of vascular cells derived from human embryonic stem cells. Nat Protoc 2010; 5:1115-26. [PMID: 20539287 DOI: 10.1038/nprot.2010.31] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Herein, we describe a protocol for the isolation of human embryonic stem cells (hESCs)-derived vascular cells at various stages of development. The cells are isolated from 10 to 15-d-old human embryoid bodies (EBs) cultured in suspension. After dissociation, cells are labeled with anti-CD34 or anti-CD31 (PECAM1) antibody and separated from the cell mixture by magnetic-activated cell separation (MACS) or fluorescent-activated cell sorting (FACS). Isolated vascular cells are then cultured in media conditions that support specific differentiation and expansion pathways. The resulting vascular cell populations contain >80% endothelial-like or smooth muscle-like cells. Assuming typical initial cell adhesion and proliferation rates, the entire procedure can be completed within 1.5 months. Vascular cells isolated and differentiated under the described conditions may constitute a potential cell source for therapeutic application toward repair of ischemic tissues, preparation of tissue-engineered vascular grafts and design of cellular kits for drug screening applications.
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44
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Cellular models for disease exploring and drug screening. Protein Cell 2010; 1:355-362. [PMID: 21203947 DOI: 10.1007/s13238-010-0027-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Accepted: 01/21/2010] [Indexed: 01/08/2023] Open
Abstract
The biopharmaceutical industry has been greatly promoted by the application of drug and disease models, including both animal and cellular models. In particular, the emergence of induced pluripotent stem cells (iPSC) makes it possible to create a large number of disease-specific cells in vitro. This review introduces the most widely applied models and their specialties.
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45
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Modulation of embryonic stem cell fate and somatic cell reprogramming by small molecules. Reprod Biomed Online 2010; 21:26-36. [PMID: 20462797 DOI: 10.1016/j.rbmo.2010.03.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Revised: 12/14/2009] [Accepted: 03/03/2010] [Indexed: 12/19/2022]
Abstract
Embryonic stem cells (ESC) are pluripotent cells and have the ability to self-renew in vitro and to differentiate into cells representing all three germ layers. They provide enormous opportunities for basic research, regenerative medicine as well as drug discovery. The mechanisms that govern ESC fate are not completely understood, so a better understanding and control of ESC self-renewal and differentiation are pivotal for therapeutic applications. In contrast to growth factors and genetic manipulations, small molecules offer great advantages in modulating ESC fate. For instance, they could be conveniently identified through high-throughput screening, work across multiple signalling pathways and affect epigenetic modifications as well. This review focuses on the recent progress in the use of small molecules to regulate ESC self-renewal, differentiation and somatic cell reprogramming.
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46
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Derivation of three new human embryonic stem cell lines. In Vitro Cell Dev Biol Anim 2010; 46:294-9. [PMID: 20198447 DOI: 10.1007/s11626-010-9298-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2009] [Accepted: 01/16/2010] [Indexed: 10/19/2022]
Abstract
Human embryonic stem cells are pluripotent cells capable of extensive self-renewal and differentiation to all cells of the embryo proper. Here, we describe the derivation and characterization of three Sydney IVF human embryonic stem cell lines not already reported elsewhere, designated SIVF001, SIVF002, and SIVF014. The cell lines display typical compact colony morphology of embryonic stem cells, have stable growth rates over more than 40 passages and are cytogenetically normal. Furthermore, the cell lines express pluripotency markers including Nanog, Oct4, SSEA3 and Tra-1-81, and are capable of generating teratoma cells derived from each of the three germ layers in immunodeficient mice. These experiments show that the cell lines constitute pluripotent stem cell lines.
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47
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Leeb C, Jurga M, McGuckin C, Moriggl R, Kenner L. Promising New Sources for Pluripotent Stem Cells. Stem Cell Rev Rep 2009; 6:15-26. [DOI: 10.1007/s12015-009-9102-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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48
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Laustriat D, Gide J, Héchard C, Peschanski M. [Embryonic stem cells in pharmacology]. Med Sci (Paris) 2009; 25 Spec No 2:32-8. [PMID: 19848191 DOI: 10.1051/medsci/2009252s32] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Because of their self-renewal and pluripotency properties, human embryonic stem cells (hES) receive a marked attention from scientists and clinicians for regenerative medicine. The most recent application of hES cells may however reside in their use as a tool in drug development. The currently available cellular models for preclinical testing consist in primary and immortalized cells that display limitations in terms of available amount and likeliness to their in vivo counterparts, respectively. hES cells have the potential to revolutionize drug discovery by providing a physiological model for any human cell type in the desired amount for the earliest steps of drug development, notably for pharmacological, metabolic and toxicity evaluation. This new generation of model may contribute to reduce, refine or replace animal testing and decrease drug attrition.
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49
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Lieu PT, Machleidt T, Thyagarajan B, Fontes A, Frey E, Fuerstenau-Sharp M, Thompson DV, Swamilingiah GM, Derebail SS, Piper D, Chesnut JD. Generation of Site-Specific Retargeting Platform Cell Lines for Drug Discovery Using phiC31 and R4 Integrases. ACTA ACUST UNITED AC 2009; 14:1207-15. [DOI: 10.1177/1087057109348941] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
One of the challenges in developing cell lines for high-throughput screening in drug discovery is the labor- and time-intensive process required to create stable clonal cell lines that express specific reporters or drug targets. The authors report here the generation of a site-specific retargeting platform in 3 different cell lines: adherent HEK293, suspension CHO-S, and a human embryonic cell line (BGO1V). These platform cell lines were generated by using a combination of 2 site-specific integrases to develop a system that allows one to efficiently target a gene of interest to a specific locus and generates rapid production of homogeneous cell pools that stably express the gene of interest. The phiC31 integrase was used to create a platform line by placing a target site for the R4 integrase into a pseudo attP site, and then the R4 integrase was used to place a gene of interest into specific R4 target site. The authors demonstrate the successful and rapid retargeting of a G-protein-coupled receptor (cholecystokinin receptor A, CCKAR), an ion channel (the transient receptor potential cation channel, subfamily M, member 8, TRPM8), and a GFP-c-Jun(1-79) fusion protein into the specific loci in these cell lines and show that these retargeted cell lines exhibit functional and pharmacological responses consistent with those reported in the literature.
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50
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de Vries RBM, Oerlemans A, Trommelmans L, Dierickx K, Gordijn B. Ethical aspects of tissue engineering: a review. TISSUE ENGINEERING PART B-REVIEWS 2009; 14:367-75. [PMID: 18834330 DOI: 10.1089/ten.teb.2008.0199] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Tissue engineering (TE) is a promising new field of medical technology. However, like other new technologies, it is not free of ethical challenges. Identifying these ethical questions at an early stage is not only part of science's responsibility toward society, but also in the interest of the field itself. In this review, we map which ethical issues related to TE have already been documented in the scientific literature. The issues that turn out to dominate the debate are the use of human embryonic stem cells and therapeutic cloning. Nevertheless, a variety of other ethical aspects are mentioned, which relate to different phases in the development of the field. In addition, we discuss a number of ethical issues that have not yet been raised in the literature.
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Affiliation(s)
- Rob B M de Vries
- Section Ethics, Philosophy, and History of Medicine, Scientific Institute for Quality of Healthcare, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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