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Yan K, Mousavi N, Yang XJ. Analysis of Lysine Acetylation and Acetylation-like Acylation In Vitro and In Vivo. Curr Protoc 2023; 3:e738. [PMID: 37184117 DOI: 10.1002/cpz1.738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Protein lysine acetylation refers to the covalent transfer of an acetyl moiety from acetyl coenzyme A to the epsilon-amino group of a lysine residue and is critical for regulating protein functions in almost all living cells or organisms. Studies in the past decade have demonstrated the unexpected finding that acetylation-like acylation, such as succinylation, propionylation, butyrylation, crotonylation, and lactylation, is also present in histones and many non-histone proteins. Acetylation and acetylation-like acylation serve as reversible on/off switches for regulating protein function while interplaying with other post-translational modifications (such as phosphorylation and methylation) in a codified manner. Lysine acetylation and acetylation-like acylation are important for regulating different cellular and developmental processes in normal and pathological states. Thus, the detection of such modifications is important for related basic research and molecular diagnostics. Traditionally, lysine acetylation is detected by autoradiography, but recent decades have seen great improvement in the quality of site-specific antibodies against acetylation (or acetylation-like acylation), thereby providing competitive alternatives to the use of radioactive acetate and acetyl-coenzyme A for in vivo and in vitro labeling, respectively. This article describes protocols for the detection of lysine acetylation and acetylation-like acylation with site-specific antibodies to complement extant autoradiography-based methods (Pelletier et al., 2017). © 2023 Wiley Periodicals LLC. Basic Protocol 1: Acylation assays in vitro Basic Protocol 2: Determination of in vivo acylation.
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Affiliation(s)
- Kezhi Yan
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montreal, Quebec, Canada
- Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Negar Mousavi
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montreal, Quebec, Canada
- Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Xiang-Jiao Yang
- Rosalind and Morris Goodman Cancer Institute, McGill University, Montreal, Quebec, Canada
- Department of Medicine, McGill University, Montreal, Quebec, Canada
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada
- McGill University Health Center, Montreal, Quebec, Canada
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Enterohemorrhagic Escherichia coli and a Fresh View on Shiga Toxin-Binding Glycosphingolipids of Primary Human Kidney and Colon Epithelial Cells and Their Toxin Susceptibility. Int J Mol Sci 2022; 23:ijms23136884. [PMID: 35805890 PMCID: PMC9266556 DOI: 10.3390/ijms23136884] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 06/07/2022] [Accepted: 06/17/2022] [Indexed: 02/06/2023] Open
Abstract
Enterohemorrhagic Escherichia coli (EHEC) are the human pathogenic subset of Shiga toxin (Stx)-producing E. coli (STEC). EHEC are responsible for severe colon infections associated with life-threatening extraintestinal complications such as the hemolytic-uremic syndrome (HUS) and neurological disturbances. Endothelial cells in various human organs are renowned targets of Stx, whereas the role of epithelial cells of colon and kidneys in the infection process has been and is still a matter of debate. This review shortly addresses the clinical impact of EHEC infections, novel aspects of vesicular package of Stx in the intestine and the blood stream as well as Stx-mediated extraintestinal complications and therapeutic options. Here follows a compilation of the Stx-binding glycosphingolipids (GSLs), globotriaosylceramide (Gb3Cer) and globotetraosylceramide (Gb4Cer) and their various lipoforms present in primary human kidney and colon epithelial cells and their distribution in lipid raft-analog membrane preparations. The last issues are the high and extremely low susceptibility of primary renal and colonic epithelial cells, respectively, suggesting a large resilience of the intestinal epithelium against the human-pathogenic Stx1a- and Stx2a-subtypes due to the low content of the high-affinity Stx-receptor Gb3Cer in colon epithelial cells. The review closes with a brief outlook on future challenges of Stx research.
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Filippi M, Buchner T, Yasa O, Weirich S, Katzschmann RK. Microfluidic Tissue Engineering and Bio-Actuation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2108427. [PMID: 35194852 DOI: 10.1002/adma.202108427] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 02/07/2022] [Indexed: 06/14/2023]
Abstract
Bio-hybrid technologies aim to replicate the unique capabilities of biological systems that could surpass advanced artificial technologies. Soft bio-hybrid robots consist of synthetic and living materials and have the potential to self-assemble, regenerate, work autonomously, and interact safely with other species and the environment. Cells require a sufficient exchange of nutrients and gases, which is guaranteed by convection and diffusive transport through liquid media. The functional development and long-term survival of biological tissues in vitro can be improved by dynamic flow culture, but only microfluidic flow control can develop tissue with fine structuring and regulation at the microscale. Full control of tissue growth at the microscale will eventually lead to functional macroscale constructs, which are needed as the biological component of soft bio-hybrid technologies. This review summarizes recent progress in microfluidic techniques to engineer biological tissues, focusing on the use of muscle cells for robotic bio-actuation. Moreover, the instances in which bio-actuation technologies greatly benefit from fusion with microfluidics are highlighted, which include: the microfabrication of matrices, biomimicry of cell microenvironments, tissue maturation, perfusion, and vascularization.
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Affiliation(s)
- Miriam Filippi
- Soft Robotics Laboratory, ETH Zurich, Tannenstrasse 3, Zurich, 8092, Switzerland
| | - Thomas Buchner
- Soft Robotics Laboratory, ETH Zurich, Tannenstrasse 3, Zurich, 8092, Switzerland
| | - Oncay Yasa
- Soft Robotics Laboratory, ETH Zurich, Tannenstrasse 3, Zurich, 8092, Switzerland
| | - Stefan Weirich
- Soft Robotics Laboratory, ETH Zurich, Tannenstrasse 3, Zurich, 8092, Switzerland
| | - Robert K Katzschmann
- Soft Robotics Laboratory, ETH Zurich, Tannenstrasse 3, Zurich, 8092, Switzerland
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Zhang L, Yu H, Yuan Y, Yu JS, Lou Z, Xue Y, Liu Y. The necessity for standardization of glioma stem cell culture: a systematic review. Stem Cell Res Ther 2020; 11:84. [PMID: 32102678 PMCID: PMC7045630 DOI: 10.1186/s13287-020-01589-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 12/15/2019] [Accepted: 02/06/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND The cancer stem cell hypothesis is an old idea which has been revived in recent years for many cancers, including gliomas. However, this concept has become controversial due to a series of studies with conflicting results. METHODS A systematic literature search was conducted in PubMed and the Web of Science database to analyze studies using serum-free medium and its components in glioma stem cells, glioma stem-like cells, glioma-initiating cells, or glioma neurosphere cultures. All the studies reviewed were published between 1970 and 2019. We found that no standardized culture method was used, and the data were incomparable due to differing culture conditions and the use of media with different components. CONCLUSIONS Here, we review the most commonly used serum-free media and added components for glioma stem cell culture while highlighting the function of each component used in the media. We emphasize the necessity for standardization of glioma stem cell culture and propose a standard culture medium to prevent bias in glioma stem cell research.
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Affiliation(s)
- Lei Zhang
- Department of Neurosurgery, Shengjing Hospital of China Medical University, # 36 Sanhao Street, Heping District, Shenyang, China.,Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, USA.,Department of Oncology, Mayo Clinic, Rochester, USA
| | - Hongwei Yu
- Department of Neurosurgery, Shengjing Hospital of China Medical University, # 36 Sanhao Street, Heping District, Shenyang, China
| | - Yuhui Yuan
- Department of Neurosurgery, Shengjing Hospital of China Medical University, # 36 Sanhao Street, Heping District, Shenyang, China
| | - John S Yu
- Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, USA
| | - Zhenkun Lou
- Department of Oncology, Mayo Clinic, Rochester, USA
| | - Yixue Xue
- Department of Neurobiology, School of Life Sciences, China Medical University, Shenyang, China
| | - Yunhui Liu
- Department of Neurosurgery, Shengjing Hospital of China Medical University, # 36 Sanhao Street, Heping District, Shenyang, China.
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Bohlen CJ, Bennett FC, Tucker AF, Collins HY, Mulinyawe SB, Barres BA. Diverse Requirements for Microglial Survival, Specification, and Function Revealed by Defined-Medium Cultures. Neuron 2017; 94:759-773.e8. [PMID: 28521131 DOI: 10.1016/j.neuron.2017.04.043] [Citation(s) in RCA: 394] [Impact Index Per Article: 56.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Revised: 03/31/2017] [Accepted: 04/28/2017] [Indexed: 12/14/2022]
Abstract
Microglia, the resident macrophages of the CNS, engage in various CNS-specific functions that are critical for development and health. To better study microglia and the properties that distinguish them from other tissue macrophage populations, we have optimized serum-free culture conditions to permit robust survival of highly ramified adult microglia under defined-medium conditions. We find that astrocyte-derived factors prevent microglial death ex vivo and that this activity results from three primary components, CSF-1/IL-34, TGF-β2, and cholesterol. Using microglial cultures that have never been exposed to serum, we demonstrate a dramatic and lasting change in phagocytic capacity after serum exposure. Finally, we find that mature microglia rapidly lose signature gene expression after isolation, and that this loss can be reversed by engrafting cells back into an intact CNS environment. These data indicate that the specialized gene expression profile of mature microglia requires continuous instructive signaling from the intact CNS.
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Affiliation(s)
- Christopher J Bohlen
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA.
| | - F Chris Bennett
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Andrew F Tucker
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Hannah Y Collins
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Sara B Mulinyawe
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Ben A Barres
- Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305, USA
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Phelan K, May KM. Basic Techniques in Mammalian Cell Tissue Culture. ACTA ACUST UNITED AC 2016; 70:A.3B.1-A.3B.22. [PMID: 27801934 DOI: 10.1002/cptx.13] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Cultured mammalian cells are used extensively in cell biology studies. It requires a number of special skills in order to be able to preserve the structure, function, behavior, and biology of the cells in culture. This unit describes the basic skills required to maintain and preserve cell cultures: maintaining aseptic technique, preparing media with the appropriate characteristics, passaging, freezing and storage, recovering frozen stocks, and counting viable cells. © 2016 by John Wiley & Sons, Inc.
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Affiliation(s)
- Katy Phelan
- Cytogenetics Laboratory, Florida Cancer Specialists, Fort Myers, Florida
| | - Kristin M May
- Genetic Diagnostic Laboratory, Children's Hospital at Erlanger, Chattanooga, Tennessee
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Abstract
Cultured mammalian cells are used extensively in cell biology studies. It requires a number of special skills in order to be able to preserve the structure, function, behavior, and biology of the cells in culture. This unit describes the basic skills required to maintain and preserve cell cultures: maintaining aseptic technique, preparing media with the appropriate characteristics, passaging, freezing and storage, recovering frozen stocks, and counting viable cells.
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Affiliation(s)
- Katy Phelan
- Hayward Genetics Program and Department of Pediatrics, Tulane University School of Medicine, New Orleans, Louisiana
| | - Kristin M May
- Genetic Diagnostic Laboratory, Children's Hospital at Erlanger, Chattanooga, Tennessee
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Tsai YS, Lai CL, Lai CH, Chang KH, Wu K, Tseng SF, Fazli L, Gleave M, Xiao G, Gandee L, Sharifi N, Moro L, Tzai TS, Hsieh JT. The role of homeostatic regulation between tumor suppressor DAB2IP and oncogenic Skp2 in prostate cancer growth. Oncotarget 2014; 5:6425-36. [PMID: 25115390 PMCID: PMC4171641 DOI: 10.18632/oncotarget.2228] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Altered DAB2IP gene expression often detected in prostate cancer (PCa) is due to epigenetic silencing. In this study, we unveil a new mechanism leading to the loss of DAB2IP protein; an oncogenic S-phase kinase-associated protein-2 (Skp2) as E3 ubiquitin ligase plays a key regulator in DAB2IP degradation. In order to unveil the role of Skp2 in the turnover of DAB2IP protein, both prostate cell lines and prostate cancer specimens with a variety of molecular and cell biologic techniques were employed. We demonstrated that DAB2IP is regulated by Skp2-mediated proteasome degradation in the prostate cell lines. Further analyses identified the N-terminal DAB2IP containing the ubiquitination site. Immunohistochemical study exhibited an inverse correlation between DAB2IP and Skp2 protein expression in the prostate cancer tissue microarray. In contrast, DAB2IP can suppressSkp2 protein expression is mediated through Akt signaling. The reciprocal regulation between DAB2IP and Skp2 can impact on the growth of PCa cells. This reciprocal regulation between DAB2IP and Skp2 protein represents a unique homeostatic balance between tumor suppressor and oncoprotein in normal prostate epithelia, which is apparently altered in cancer cells. The outcome of this study has identified new potential targets for developing new therapeutic strategy for PCa.
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Affiliation(s)
- Yuh-Shyan Tsai
- Department of Urology, Medical College and Hospital, National Cheng Kung University, Tainan, Taiwan; Department of Urology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Chen-Li Lai
- Department of Urology, Medical College and Hospital, National Cheng Kung University, Tainan, Taiwan
| | - Chih-Ho Lai
- School of Medicine and Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan
| | - Kai-Hsiung Chang
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Kaijie Wu
- Department of Urology, The First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an, China
| | - Shu-Fen Tseng
- Department of Bioengineering, University of Texas at Arlington, Arlington, TX, USA
| | - Ladan Fazli
- VancouverProstate Center, University of British Columbia, Vancouver, British Columbia, Canada
| | - Martin Gleave
- VancouverProstate Center, University of British Columbia, Vancouver, British Columbia, Canada
| | - Guanghua Xiao
- Department of Clinical Sciences, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Leah Gandee
- Department of Urology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Nima Sharifi
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Loredana Moro
- Institute of Biomembranes and Bioenergetics, National Research Council (C.N.R.), Bari, Italy
| | - Tzong-Shin Tzai
- Department of Urology, Medical College and Hospital, National Cheng Kung University, Tainan, Taiwan
| | - Jer-Tsong Hsieh
- Department of Urology, University of Texas Southwestern Medical Center, Dallas, TX, USA; Graduate Institute of Cancer Biology, China Medical University, Taichung, Taiwan
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Pillai AD, Nguitragool W, Lyko B, Dolinta K, Butler MM, Nguyen ST, Peet NP, Bowlin TL, Desai SA. Solute restriction reveals an essential role for clag3-associated channels in malaria parasite nutrient acquisition. Mol Pharmacol 2012; 82:1104-14. [PMID: 22949525 DOI: 10.1124/mol.112.081224] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The plasmodial surface anion channel (PSAC) increases erythrocyte permeability to many solutes in malaria but has uncertain physiological significance. We used a PSAC inhibitor with different efficacies against channels from two Plasmodium falciparum parasite lines and found concordant effects on transport and in vitro parasite growth when external nutrient concentrations were reduced. Linkage analysis using this growth inhibition phenotype in the Dd2 × HB3 genetic cross mapped the clag3 genomic locus, consistent with a role for two clag3 genes in PSAC-mediated transport. Altered inhibitor efficacy, achieved through allelic exchange or expression switching between the clag3 genes, indicated that the inhibitor kills parasites through direct action on PSAC. In a parasite unable to undergo expression switching, the inhibitor selected for ectopic homologous recombination between the clag3 genes to increase the diversity of available channel isoforms. Broad-spectrum inhibitors, which presumably interact with conserved sites on the channel, also exhibited improved efficacy with nutrient restriction. These findings indicate that PSAC functions in nutrient acquisition for intracellular parasites. Although key questions regarding the channel and its biological role remain, antimalarial drug development targeting PSAC should be pursued.
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Affiliation(s)
- Ajay D Pillai
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
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Clancy HA, Sun H, Passantino L, Kluz T, Muñoz A, Zavadil J, Costa M. Gene expression changes in human lung cells exposed to arsenic, chromium, nickel or vanadium indicate the first steps in cancer. Metallomics 2012; 4:784-93. [PMID: 22714537 DOI: 10.1039/c2mt20074k] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The complex process of carcinogenesis begins with transformation of a single cell to favor aberrant traits such as loss of contact inhibition and unregulated proliferation - features found in every cancer. Despite cancer's widespread prevalence, the early events that initiate cancer remain elusive, and without knowledge of these events cancer prevention is difficult. Here we show that exposure to As, Cr, Ni, or vanadium (V) promotes changes in gene expression that occur in conjunction with aberrant growth. We exposed immortalized human bronchial epithelial cells to one of four metals/metalloid for four to eight weeks and selected transformed clonal populations based upon anchorage independent growth of single cells in soft agar. We detected a metal-specific footprint of cancer-related gene expression that was consistent across multiple transformed clones. These gene expression changes persisted in the absence of the progenitor metal for numerous cell divisions. Our results show that even a brief exposure to a carcinogenic metal may cause many changes in gene expression in the exposed cells, and that from these many changes, the specific change(s) that each metal causes that initiate cancer likely arise.
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Affiliation(s)
- Hailey A Clancy
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Department of Environmental Health Sciences, 57 Old Forge Road, Tuxedo, NY 10987, USA
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Malchus N. Fluorescence Correlation Spectroscopy: Detecting and Interpreting the Mobility of Transmembrane Proteins In Vivo. ACTA ACUST UNITED AC 2011; Chapter 2:Unit2.19. [DOI: 10.1002/0471140856.tx0219s48] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nina Malchus
- German Cancer Research Center Heidelberg Germany
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Kita K, Gauglitz GG, Phan TT, Herndon DN, Jeschke MG. Isolation and characterization of mesenchymal stem cells from the sub-amniotic human umbilical cord lining membrane. Stem Cells Dev 2010; 19:491-502. [PMID: 19635009 DOI: 10.1089/scd.2009.0192] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The use of human stem cells (SCs) is a promising novel approach for the treatment of many diseases and injuries. Umbilical cord and amniotic membrane represent good sources for SCs, because they are abundant sources and there are less ethical issues unlike embryonic SCs. We aimed to isolate and characterize adult SCs from the subamnion region of the umbilical cord/amniotic membrane. Because mesenchymal stem cells (MSCs) are thought to show less immunogenicity, we first focused on the characterization of MSCs. Significant expression of typical SC-specific markers, such as SSEA-4, Oct-4, and Nanog was observed. Subamniotic MSCs did not lose the expression of Oct-4 and Nanog after freeze-thawing. Cell surface expression of MSC markers (CD73 and CD105) was confirmed by flow cytometry, and cells also differentiated into adipogenic, osteogenic, and chondrogenic lineages. On the other hand, typical embryonic SC-specific markers were not expressed and the cells also did not grow in soft agar. Thus, the subamniotic MSCs are distinct from embryonic SCs and do not show tumorigenicity in vitro. The cord lining membrane (subamniotic) MSCs isolated by our method maintain typical characteristics of MSCs in vitro, but also showed several specific features.
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Affiliation(s)
- Katsuhiro Kita
- Department of Surgery and Shriners Hospitals for Children, The University of Texas Medical Branch, Galveston, Texas 77550, USA.
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Ammerman NC, Beier-Sexton M, Azad AF. Growth and maintenance of Vero cell lines. ACTA ACUST UNITED AC 2008; Appendix 4:Appendix 4E. [PMID: 19016439 DOI: 10.1002/9780471729259.mca04es11] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Vero cells are derived from the kidney of an African green monkey, and are one of the more commonly used mammalian continuous cell lines in microbiology and molecular and cell biology research. This unit includes protocols for the growth and maintenance of Vero cell lines in a research laboratory setting.
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Affiliation(s)
- Nicole C Ammerman
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
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Wolchok JC, Brokopp C, Underwood CJ, Tresco PA. The effect of bioreactor induced vibrational stimulation on extracellular matrix production from human derived fibroblasts. Biomaterials 2008; 30:327-35. [PMID: 18937972 DOI: 10.1016/j.biomaterials.2008.08.035] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2008] [Accepted: 08/20/2008] [Indexed: 12/18/2022]
Abstract
To study the affect of mechanical stimuli on human laryngeal fibroblasts, we developed bioreactors capable of vibrating cell seeded substrates at frequencies and displacements comparable to measured phonation values in human subjects. In addition, we developed a means of harvesting the secreted matrix as a bulk biomaterial by removing the polymer foam using an organic solvent. Using the system human derived laryngeal fibroblasts were subjected to vibrational stimuli (100 Hz) for 1-21 days. Following mechanical conditioning, extracellular matrix and matrix related gene expression, cytokine production, matrix protein accumulation, and construct material properties were assessed with DNA microarray, enzyme linked immunosorbent, indirect immunofluorescent, and uni-axial tensile assays respectively. The results show that vocal fold-like vibrational stimuli is sufficient to influence the expression of several key matrix and matrix related genes, enhance the secretion of the profibrotic cytokine TGFbeta1, increase the accumulation of the extracellular matrix proteins, fibronectin and collagen type 1, as well as enhance construct stiffness compared to non-stimulated controls. Our results demonstrate that high frequency substrate vibration, like cyclic strain, can accelerate matrix deposition from human derived laryngeal fibroblasts. The study supports the notion that preconditioning regimens using human cells may be useful for producing cell derived biomaterials for therapeutic application.
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Affiliation(s)
- Jeffrey C Wolchok
- Keck Center for Tissue Engineering, Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
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