Un financement partiel de ce travail a été fourni par NSF-CAREER 0744556 (Rao) et une bourse par le biais de l&#39;éducation VCU-HHMI Programme de sciences et de la recherche (Pascual).

Partie 1: Coloration Suspension immunocytochimique <ol><li> Les cellules sont récoltées dans une suspension cellulaire unique. </li><li> Les cellules sont ensuite transférés dans des microtubes de 1,5 2mL et centrifugé à 200g pendant 4 minutes. </li><li> Les cellules sont lavées par l&#39;aspiration à surnageant, remis en suspension dans 1ml de PBS - (sans Mg 2 + et Ca 2 +) et ensuite centrifugé à nouveau à 200g pendant 4 minutes. Cela devrait être fait deux fois. </li><li> Après lavage, les cellules sont alors fixées par remise en suspension eux dans 1 ml de paraformaldéhyde 4% (PFA) à température ambiante pendant 10 minutes. </li><li> Les cellules sont lavées à nouveau deux fois avec 1 mL de PBS -. </li><li> Après le lavage des cellules bloc, en re-suspension eux dans 1 ml de solution Block (6% serum/94% PBS -). Incuber ces à température ambiante pendant 45 minutes. </li><li> Après, centrifuger les tubes à 200g pendant 4 minutes et aspirer à la solution de bloc. Re-suspendre les cellules dans 1 ml de la solution d&#39;anticorps primaire (faite avec la solution de bloc à la dilution recommandée). Les cellules peuvent être soit mis à incuber à température ambiante pendant 1 heure ou à 4 ° C pendant une nuit avant de passer à l&#39;étape suivante. </li><li> Les cellules sont ensuite lavées deux fois avec 1 ml de solution de bloc. </li><li> Après, rétablir la suspension des cellules dans 1 ml de solution d&#39;anticorps secondaire (faite avec la solution de bloc à la dilution recommandée) et incuber à température ambiante pendant 1 heure. </li><li> Après 1 heure, les cellules doivent ensuite être lavés à nouveau deux fois avec 1 ml de solution de bloc. </li><li> Après lavage avec une solution Block, laver les cellules à nouveau avec 1ml de PBS -. </li><li> Après les différents lavages, rétablir la suspension des cellules dans 1 ml de DAPI colorant nucléaire (1:10.000 dilution du DAPI dans PBS -) et incuber à température ambiante pendant 5 minutes. </li><li> Après 5 minutes, centrifuger les tubes à 200g pendant 4 minutes. Aspirer le DAPI solution de colorant nucléaire et de remettre en suspension les cellules dans 1ml de PBS -. </li></ol> Incorporation de hPSCs dans les diapositives générées par un appareil cytospin: Partie 2 <ol><li> Diapositives en plastique sont préparés en faisant la quantité désirée de trous dedans avec une perceuse. Le diamètre doit être au plus 1 mm plus grand que le diamètre le plus large de la pointe micropipette (s) à être utilisé. </li><li> Le papier filtre est coupé à des paramètres de la glissière en plastique avec des ciseaux. </li><li> Les trous sont ensuite réalisés dans le papier filtre. La taille du trou (s) doit être assez grand pour que la pointe de micropipette (s) se range à travers elle. </li><li> Après, l&#39;une des diapositives préparées en plastique est placé sur le dessus et une lame de verre dans placées au bas du papier filtre coupe (figure 1). Les couches sont sécurisés avec du ruban adhésif. </li><li> Un maximum de 100 ul (selon la densité désirée monocouche) de la suspension cellulaire teinté de la Partie 1 est ensuite placée dans le haut de la pointe micropipette (s). </li><li> Si nécessaire, l&#39;appareil avec une solution de cellules peuvent être pesés et un contrepoids de poids similaire créé. </li><li> L&#39;appareil cytospin et contrepoids peuvent sont ensuite placés dans une centrifugeuse de bureau et centrifugé à 200g pendant 4 minutes. </li><li> Après centrifugation, l&#39;appareil est soigneusement démonté cytospin d&#39;une manière qui ne marche pas déloger les cellules de la lame de verre. </li><li> Si nécessaire, l&#39;excès entourant PBS - sur le côté verre dans aspirés hors. </li><li> Les cellules peuvent ensuite être visualisées en utilisant un microscope à fluorescence pour vérifier si la monocouche cellulaire désiré a été atteint. </li></ol> Partie 3: montage diapos <ol><li> Une goutte de la presse de montage souhaité est placé directement dans le centre de chaque zone contenant des cellules. </li><li> Après, une lamelle est doucement descendu sur les diapositives en essayant d&#39;éviter les bulles d&#39;air, si possible. </li><li> L&#39;excès des médias de montage est ensuite retiré de diapositives. </li><li> Après, les côtés de l&#39;lamelles sont scellées avec du vernis à ongle. </li><li> Les diapositives peuvent être conservés dans une zone de stockage dans le noir avant que les résultats sont observés et documentés. </li></ol>

<ol>
	<li>Rao, R. R., Johnson, A. V., Stice, S. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell+surface+markers+in+human+embryonic+stem+cells.">Cell surface markers in human embryonic stem cells.</a> Methods in Mol. Bio. - Stem Cell Assays. 407, 51-61 (2007).</li><li>Sisino, G., Bellavia, D., Corallo, M., Geraci, F., Barbieri, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+homemade+cytospin+apparatus.">A homemade cytospin apparatus.</a> Anal. Biochem. 359, 283-284 (2006).</li></ol>

Aux fins de notre laboratoire, un plat de 35mm de cultures de cellules souches cultivées sur des fibroblastes embryonnaires de souris (MEF) est alloué pour la procédure de marquage immunocytochimique pour une utilisation avec l&#39;appareil cytospin. Les cellules sont ensuite collectées par le biais du enzymatique repiquage, en supprimant autant de la couche MEF que possible, en une suspension à cellule unique. Si plus une isolation efficace de cellules souches à partir de la couche MEF est souhaitée, les colonie...

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		<th>Catalogue Number</th>
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<tr>
<td>Lab Tek Permanox Chamber Slide</td>
<td>&nbsp;</td>
<td>Thermo Fisher Scientific</td>
<td>117437</td>
<td>Material for re-used plastic slides</td>
</tr>
<tr>
<td>Superfrost/Plus Microscope Slides Precleaned</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>12-550-15</td>
<td>&nbsp;</td>
<tr>
<td>0.1-10&mu;L Filter Tips</td>
<td>&nbsp;</td>
<td>USA Scientific</td>
<td>1121-3810</td>
<td>&nbsp;</td>
<tr>
<td>Microscope Cover Glass</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>120542-B</td>
<td>&nbsp;</td>
<tr>
<td>Cytoseal 280</td>
<td>&nbsp;</td>
<td>Richard-Allan Scientific</td>
<td>8311-4</td>
<td>Mounting Medium</td>
</tr>
<tr>
<td>DPBS</td>
<td>&nbsp;</td>
<td>Gibco</td>
<td>14190</td>
<td>&nbsp;</td>
<tr>
<td>Normal Goat Serum</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>10000C</td>
<td>&nbsp;</td>
<tr>
<td>Mouse Anti-SSEA-4 Monoclonal Antibody</td>
<td>&nbsp;</td>
<td>Millipore/Chemicon</td>
<td>MAB4304</td>
<td>Primary Antibody for SSEA-4 staining</td>
</tr>
<tr>
<td>Rat Anti-SSEA-3 Monoclonal Antibody</td>
<td>&nbsp;</td>
<td>Millipore/Chemicon</td>
<td>MAB4303</td>
<td>Primary Antibody for SSEA-3 staining</td>
</tr>
<tr>
<td>Alexa Fluor 488 Goat Anti-Mouse IgG</td>
<td>&nbsp;</td>
<td>Invitrogen/ Molecular Probes</td>
<td>A11029</td>
<td>Secondary Antibody for SSEA-4 staining</td>
</tr>
<tr>
<td>Alexa Fluor 488 Labeled Goat Anti-Rat IgG </td>
<td>&nbsp;</td>
<td>Invitrogen/ Molecular Probes</td>
<td>A11006</td>
<td>Secondary Antibody for SSEA-3 staining</td>
</tr>
<tr>
<td>DAPI, Dihydrochloride</td>
<td>&nbsp;</td>
<td>CalBioChem</td>
<td>268298</td>
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immunocytochemical analysis of human pluripotent stem cells using a self-made cytospin apparatus

Cellules souches pluripotentes humaines (hPSCs) qui incluent des cellules souches embryonnaires humaines (CSEh) et humains cellules souches pluripotentes induites (hiPSCs) sont des sources de cellules passionnante en raison de leur auto-renouvellement illimité des capacités et leur potentiel de se différencier en plusieurs types cellulaires. L&#39;état pluripotent des hPSCs est généralement évaluée par des techniques telles que qPCR, immunocytochimie, et par d&#39;autres<em&gt; In vitro</em&gt; Et<em&gt; In vivo</emLes stratégies de différenciation&gt; en plusieurs types cellulaires. Parmi ces derniers, des techniques immunocytochimiques ont été développés pour la caractérisation de routine de l&#39;état indifférencié de hPSCs basée sur l&#39;analyse des biomarqueurs candidats intracellulaire et la surface des cellules. Compte tenu du fait que grandir en tant hPSCs colonies, des problèmes surgissent dans la quantification de l&#39;expression de ces marqueurs au niveau des cellules individuelles sur une base routinière. Analyses par cytométrie en flux permettent d&#39;aborder cette question, mais nécessitent un nombre de cellules et l&#39;utilisation de réactifs qui ne sont normalement pas propice à l&#39;évaluation de la qualité de contrôle de routine des cultures HPSC. Ainsi, le développement de moyens pratiques et reproductibles de créer des échantillons de cellules monocouche avec intégrité préservée pour l&#39;évaluation marqueur a de nombreux avantages en matière de recherche sur les cellules souches. Cela profite grandement analyse immunocytochimique des cellules individuelles en raison de la monocouche peut être facilement observés et quantifiés pour l&#39;expression de marqueurs spécifiques. Pour atteindre cet objectif, un appareil de self-made cytospin a été construit et optimisé pour une utilisation avec la coloration immunocytochimique. Deux marqueurs de surface cellulaire (SSEA3/SSEA4) d&#39;expression ont été analysés dans une ligne de la variante BG01 cellules souches dans le but de ce protocole.

Watch this Scientific Journal Video about Immunocytochemical Analysis of Human Pluripotent Stem Cells using a Self-Made Cytospin Apparatus at JoVE.com

Immunocytochemical Analysis of Human Pluripotent Stem Cells using a Self-Made Cytospin Apparatus

Suspension coloration immunocytochimique de cellules souches pluripotentes humaines (hPSCs) pour les marqueurs de surface cellulaire (SSEA-3/SSEA-4) a été réalisé basée sur l&#39;utilisation d&#39;un appareil de self-made cytospin de créer une monocouche de cellules d&#39;observation et de quantification.

Analyse immunocytochimique des cellules souches pluripotentes humaines en utilisant un appareil Self-Made Cytospin

Human pluripotent stem cells (hPSCs) that include human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs) are exciting cell ...

immunocytochemical-analysis-human-pluripotent-stem-cells-using-self

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14.2K vues.  Virginia Commonwealth University. Suspension coloration immunocytochimique de cellules souches pluripotentes humaines (hPSCs) pour les marqueurs de surface cellulaire (SSEA-3/SSEA-4) a été réalisé basée sur l'utilisation d'un appareil de self-made cytospin de créer une monocouche de cellules d'observation et de quantification.

Vidéo: Immunocytochemical Analysis of Human Pluripotent Stem Cells using a Self-Made Cytospin Apparatus

Analysis of Pluripotent Stem Cells by using Cryosections of Embryoid Bodies

Embryonic stem (ES) cells are pluripotent cells derived from the inner cell mass of blastocyst-stage early mammalian embryos 1. A crucial stage in the differentiation of ES cells is the formation of embryoid bodies (EBs) aggregates 2, 3. EB formation is based on spontaneous aggregation when ES cells are cultured in non adherent plates. Three-dimensional EB recapitulates many aspects of early mammalian embryogenesis and differentiate into the three germ layers: ectoderm, mesoderm and endoderm 4.
Immunofluorescence and in situ hybridization are widely used techniques for the detection of target proteins and mRNA present in cells of a tissue section 5, 6, 7. Here we present a simple technique to generate high quality cryosections of embryoid bodies. This approach relies on the spatial orientation of EB embedding in OCT followed by the cryosection technique. The resulting sections can be subjected to a wide variety of analytical procedures in order to characterize populations of cells containing certain proteins, RNA or DNA. In this sense, the preparation of EB cryosections (10&mu;m) are essential tools for histology staining analysis (e.g. Hematoxilin and Eosin, DAPI), immunofluorescence (e.g. Oct4, nestin) or in situ hybridization. This technique can also help to understand aspects of embryogenesis with regards to the maintenance of the tri-dimensional spherical structure of EBs.

Pluripotent stem cells growing in suspension differentiate into embryoid bodies (EBs). Here we demonstrate how to obtain high quality EB cryosections useful for studying cellular and molecular aspects of embryogenesis, while preserving their organization as aggregates.

Analyse de cellules souches pluripotentes en utilisant cryocoupes de corps embryoïdes

Embryonic stem (ES) cells are pluripotent cells derived from the inner cell mass of blastocyst-stage early mammalian embryos 1. A crucial stage in the ...

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Biologie

Transfecting and Nucleofecting Human Induced Pluripotent Stem Cells

Genetic modification is continuing to be an essential tool in studying stem cell biology and in setting forth potential clinical applications of human embryonic stem cells (HESCs)1. While improvements in several gene delivery methods have been described2-9, transfection remains a capricious process for HESCs, and has not yet been reported in human induced pluripotent stem cells (iPSCs). In this video, we demonstrate how our lab routinely transfects and nucleofects human iPSCs using plasmid with an enhanced green fluorescence protein (eGFP) reporter. Human iPSCs are adapted and maintained as feeder-free cultures to eliminate the possibility of feeder cell transfection and to allow efficient selection of stable transgenic iPSC clones following transfection. For nucleofection, human iPSCs are pre-treated with ROCK inhibitor11, trypsinized into small clumps of cells, nucleofected and replated on feeders in feeder cell-conditioned medium to enhance cell recovery. Transgene-expressing human iPSCs can be obtained after 6 hours. Antibiotic selection is applied after 24 hours and stable transgenic lines appear within 1 week. Our protocol is robust and reproducible for human iPSC lines without altering pluripotency of these cells.

Despite recent advancements in genetic modification, transfection of human embryonic stem cells (HESCs) remains a capricious process. To our knowledge, systematic and efficient methods to transfect human induced pluripotent stem cells (iPSCs) have not been reported. Here, we describe robust protocols to efficiently transfect and nucleofect human iPSCs.

Transfection et Nucleofecting homme cellules souches pluripotentes induites

Genetic modification is continuing to be an essential tool in studying stem cell biology and in setting forth potential clinical applications of human ...

Efficient Derivation of Human Cardiac Precursors and Cardiomyocytes from Pluripotent Human Embryonic Stem Cells with Small Molecule Induction

To date, the lack of a suitable human cardiac cell source has been the major setback in regenerating the human myocardium, either by cell-based transplantation or by cardiac tissue engineering1-3. Cardiomyocytes become terminally-differentiated soon after birth and lose their ability to proliferate. There is no evidence that stem/progenitor cells derived from other sources, such as the bone marrow or the cord blood, are able to give rise to the contractile heart muscle cells following transplantation into the heart1-3. The need to regenerate or repair the damaged heart muscle has not been met by adult stem cell therapy, either endogenous or via cell delivery1-3. The genetically stable human embryonic stem cells (hESCs) have unlimited expansion ability and unrestricted plasticity, proffering a pluripotent reservoir for in vitro derivation of large supplies of human somatic cells that are restricted to the lineage in need of repair and regeneration4,5. Due to the prevalence of cardiovascular disease worldwide and acute shortage of donor organs, there is intense interest in developing hESC-based therapies as an alternative approach. However, how to channel the wide differentiation potential of pluripotent hESCs efficiently and predictably to a desired phenotype has been a major challenge for both developmental study and clinical translation. Conventional approaches rely on multi-lineage inclination of pluripotent cells through spontaneous germ layer differentiation, resulting in inefficient and uncontrollable lineage-commitment that is often followed by phenotypic heterogeneity and instability, hence, a high risk of tumorigenicity6-8 (see a schematic in Fig. 1A). In addition, undefined foreign/animal biological supplements and/or feeders that have typically been used for the isolation, expansion, and differentiation of hESCs may make direct use of such cell-specialized grafts in patients problematic9-11. To overcome these obstacles, we have resolved the elements of a defined culture system necessary and sufficient for sustaining the epiblast pluripotence of hESCs, serving as a platform for de novo derivation of clinically-suitable hESCs and effectively directing such hESCs uniformly towards clinically-relevant lineages by small molecules12 (see a schematic in Fig. 1B). After screening a variety of small molecules and growth factors, we found that such defined conditions rendered nicotinamide (NAM) sufficient to induce the specification of cardiomesoderm direct from pluripotent hESCs that further progressed to cardioblasts that generated human beating cardiomyocytes with high efficiency (Fig. 2). We defined conditions for induction of cardioblasts direct from pluripotent hESCs without an intervening multi-lineage embryoid body stage, enabling well-controlled efficient derivation of a large supply of human cardiac cells across the spectrum of developmental stages for cell-based therapeutics.

We have established a protocol for induction of cardioblasts direct from pluripotent human embryonic stem cells maintained under defined conditions with small molecules, which enables derivation of a large supply of human cardiac progenitors and functional cardiomyocytes for cardiovascular repair.

Dérivation efficace des ressources humaines précurseurs cardiaques et les cardiomyocytes à partir pluripotentes cellules souches embryonnaires humaines à l&#39;induction de petites molécules

To date, the lack of a suitable human cardiac cell source has been the major setback in regenerating the human myocardium, either by cell-based ...

Reprogramming Human Somatic Cells into Induced Pluripotent Stem Cells (iPSCs) Using Retroviral Vector with GFP

Human embryonic stem cells (hESCs) are pluripotent and an invaluable cellular sources for in vitro disease modeling and regenerative medicine1. It has been previously shown that human somatic cells can be reprogrammed to pluripotency by ectopic expression of four transcription factors (Oct4, Sox2, Klf4 and Myc) and become induced pluripotent stem cells (iPSCs)2-4 . Like hESCs, human iPSCs are pluripotent and a potential source for autologous cells. Here we describe the protocol to reprogram human fibroblast cells with the four reprogramming factors cloned into GFP-containing retroviral backbone4. Using the following protocol, we generate human iPSCs in 3-4 weeks under human ESC culture condition. Human iPSC colonies closely resemble hESCs in morphology and display the loss of GFP fluorescence as a result of retroviral transgene silencing. iPSC colonies isolated mechanically under a fluorescence microscope behave in a similar fashion as hESCs. In these cells, we detect the expression of multiple pluripotency genes and surface markers.

Reprogramming Human Somatic Cells into Induced Pluripotent Stem Cells iPSCs Using Retroviral Vector with GFP

A method to generate human induced pluripotent stem cells (iPSCs) via retrovirus-mediated ectopic expression of OCT4, SOX2, KLF4 and MYC is described. A practical way to identify human iPSC colonies based on GFP expression is also discussed.

Reprogrammation des cellules somatiques humaines dans cellules souches pluripotentes induites (CISP) Utilisation vecteur rétroviral avec la GFP

Human embryonic stem cells (hESCs) are pluripotent and an invaluable cellular sources for in vitro disease modeling and regenerative medicine1. It has ...

Generation of Human Induced Pluripotent Stem Cells from Peripheral Blood Using the STEMCCA Lentiviral Vector

Through the ectopic expression of four transcription factors, Oct4, Klf4, Sox2 and cMyc, human somatic cells can be converted to a pluripotent state, generating so-called induced pluripotent stem cells (iPSCs)1-4. Patient-specific iPSCs lack the ethical concerns that surround embryonic stem cells (ESCs) and would bypass possible immune rejection. Thus, iPSCs have attracted considerable attention for disease modeling studies, the screening of pharmacological compounds, and regenerative therapies5.
We have shown the generation of transgene-free human iPSCs from patients with different lung diseases using a single excisable polycistronic lentiviral Stem Cell Cassette (STEMCCA) encoding the Yamanaka factors6. These iPSC lines were generated from skin fibroblasts, the most common cell type used for reprogramming. Normally, obtaining fibroblasts requires a skin punch biopsy followed by expansion of the cells in culture for a few passages. Importantly, a number of groups have reported the reprogramming of human peripheral blood cells into iPSCs7-9. In one study, a Tet inducible version of the STEMCCA vector was employed9, which required the blood cells to be simultaneously infected with a constitutively active lentivirus encoding the reverse tetracycline transactivator. In contrast to fibroblasts, peripheral blood cells can be collected via minimally invasive procedures, greatly reducing the discomfort and distress of the patient. A simple and effective protocol for reprogramming blood cells using a constitutive single excisable vector may accelerate the application of iPSC technology by making it accessible to a broader research community. Furthermore, reprogramming of peripheral blood cells allows for the generation of iPSCs from individuals in which skin biopsies should be avoided (i.e. aberrant scarring) or due to pre-existing disease conditions preventing access to punch biopsies.
Here we demonstrate a protocol for the generation of human iPSCs from peripheral blood mononuclear cells (PBMCs) using a single floxed-excisable lentiviral vector constitutively expressing the 4 factors. Freshly collected or thawed PBMCs are expanded for 9 days as described10,11 in medium containing ascorbic acid, SCF, IGF-1, IL-3 and EPO before being transduced with the STEMCCA lentivirus. Cells are then plated onto MEFs and ESC-like colonies can be visualized two weeks after infection. Finally, selected clones are expanded and tested for the expression of the pluripotency markers SSEA-4, Tra-1-60 and Tra-1-81. This protocol is simple, robust and highly consistent, providing a reliable methodology for the generation of human iPSCs from readily accessible 4 ml of blood.

Here we show a simple and effective protocol for the generation of human iPSCs from 3-4 ml of peripheral blood using a single lentiviral reprogramming vector. Reprogramming of readily available blood cells promises to accelerate the utilization of iPSC technology by making it accessible to a broader research community.

Génération de l&#39;homme cellules souches pluripotentes induites à partir de sang périphérique en utilisant le vecteur lentiviral STEMCCA

Through the ectopic expression of four transcription factors, Oct4, Klf4, Sox2 and cMyc, human somatic cells can be converted to a pluripotent state, ...

Generation of Human Cardiomyocytes: A Differentiation Protocol from Feeder-free Human Induced Pluripotent Stem Cells

In order to investigate the events driving heart development and to determine the molecular mechanisms leading to myocardial diseases in humans, it is essential first to generate functional human cardiomyocytes (CMs). The use of these cells in drug discovery and toxicology studies would also be highly beneficial, allowing new pharmacological molecules for the treatment of cardiac disorders to be validated pre-clinically on cells of human origin. Of the possible sources of CMs, induced pluripotent stem (iPS) cells are among the most promising, as they can be derived directly from readily accessible patient tissue and possess an intrinsic capacity to give rise to all cell types of the body 1. Several methods have been proposed for differentiating iPS cells into CMs, ranging from the classical embryoid bodies (EBs) aggregation approach to chemically defined protocols 2,3. In this article we propose an EBs-based protocol and show how this method can be employed to efficiently generate functional CM-like cells from feeder-free iPS cells.

Pluripotent stem cells, either embryonic or induced pluripotent stem (iPS) cells, constitute a valuable source of human differentiated cells, including cardiomyocytes. Here, we will focus on cardiac induction of iPS cells, showing how to use them to obtain functional human cardiomyocytes through an embryoid bodies-based protocol.

Génération de cardiomyocytes humains: Un protocole de différenciation des induits des cellules souches pluripotentes humaines chargeur sans

In order to investigate the events driving heart development and to determine the molecular mechanisms leading to myocardial diseases in humans, it is ...

Induction and Analysis of Epithelial to Mesenchymal Transition

Epithelial to mesenchymal transition (EMT) is essential for proper morphogenesis during development. Misregulation of this process has been implicated as a key event in fibrosis and the progression of carcinomas to a metastatic state. Understanding the processes that underlie EMT is imperative for the early diagnosis and clinical control of these disease states. Reliable induction of EMT in vitro is a useful tool for drug discovery as well as to identify common gene expression signatures for diagnostic purposes. Here we demonstrate a straightforward method for the induction of EMT in a variety of cell types. Methods for the analysis of cells pre- and post-EMT induction by immunocytochemistry are also included. Additionally, we demonstrate the effectiveness of this method through antibody-based array analysis and migration/invasion assays.

A straightforward method is described for the induction of epithelial to mesenchymal transition (EMT) in a variety of cell types. Methods for the analysis of cells in EMT states by immunocytochemistry are included.

Induction et analyse des épithéliale à mésenchymateuses transition

Epithelial  to mesenchymal transition (EMT) is essential for proper morphogenesis during  development. Misregulation of this  process has been implicated ...

Efficient Generation Human Induced Pluripotent Stem Cells from Human Somatic Cells with Sendai-virus

A few years ago, the establishment of human induced pluripotent stem cells (iPSCs) ushered in a new era in biomedicine. Potential uses of human iPSCs include modeling pathogenesis of human genetic diseases, autologous cell therapy after gene correction, and personalized drug screening by providing a source of patient-specific and symptom relevant cells. However, there are several hurdles to overcome, such as eliminating the remaining reprogramming factor transgene expression after human iPSCs production. More importantly, residual transgene expression in undifferentiated human iPSCs could hamper proper differentiations and misguide the interpretation of disease-relevant in vitro phenotypes. With this reason, integration-free and/or transgene-free human iPSCs have been developed using several methods, such as adenovirus, the piggyBac system, minicircle vector, episomal vectors, direct protein delivery and synthesized mRNA. However, efficiency of reprogramming using integration-free methods is quite low in most cases.
Here, we present a method to isolate human iPSCs by using Sendai-virus (RNA virus) based reprogramming system. This reprogramming method shows consistent results and high efficiency in cost-effective manner.

Here, we present our established method to reprogram human somatic cells into transgene-free human iPSCs with Sendai virus, which shows consistent outcome and enhanced efficiency.

Génération efficace d&#39;origine humaine souches pluripotentes à partir de cellules somatiques humaines avec Sendai-virus

A few years ago, the establishment of human induced pluripotent stem cells (iPSCs) ushered in a new era in biomedicine. Potential uses of human iPSCs ...

A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency

Transepithelial/endothelial electrical resistance (TEER) has been used since the 1980s to determine confluency and permeability of in vitro barrier model systems. In most cases, chopstick electrodes are used to determine the electric impedance between the upper and lower compartment of a cell culture filter insert system containing cellular monolayers. The filter membrane allows the cells to adhere, polarize, and interact by building tight junctions. This technique has been described with a variety of different cell lines (e.g., cells of the blood-brain barrier, blood-cerebrospinal fluid barrier, or gastrointestinal and pulmonary tract). TEER measurement devices can be readily obtained from different laboratory equipment suppliers. However, there are more cost-effective and customizable solutions imaginable if an appropriate voltammeter is self-assembled. The overall aim of this publication is to set up a reliable device with programmable output frequency that can be used with commercially available chopstick electrodes for TEER measurement.

Here, we demonstrate how to set up an inexpensive volt-amperemeter with programmable output frequency that can be used with commercially available chopstick electrodes for transepithelial/endothelial electrical resistance measurements.

Une approche simple pour effectuer des mesures TEER à l'aide d'une Volt-Amperemètre auto-faite avec fréquence de sortie programmable

Transepithelial/endothelial electrical resistance (TEER) has been used since the 1980s to determine confluency and permeability of in vitro barrier model ...

Hepatic Progenitor Specification from Pluripotent Stem Cells using a Defined Differentiation System

Liver disease is an escalating global health issue. While liver transplantation is an effective mode of therapy, patient mortality has increased due to shortages in donor organ availability. Organ scarcity also affects the routine supply of human hepatocytes for basic research and the clinic. Therefore, the development of renewable sources of human liver progenitor cells is desirable and is the goal of this study. To be able to effectively generate and deploy human liver progenitors on a large scale, a reproducible hepatic progenitor differentiation system was developed. This protocol aids experimental reproducibility between users in a range of cell cultureware formats and permits differentiations using both, human embryonic and induced pluripotent stem cell lines. These are important advantages over current differentiation systems that will enhance the basic research and may pave the way towards clinical product development.

The goal of this article is to provide a standardized approach to induce human hepatic progenitor differentiation from pluripotent stem cells. The development of this procedure with ready-to-use media formulations offer the user a facile system to generate human liver cells for biomedical research and translation.

Spécification du progéniteur hépatique à partir de cellules souches pluripotentes à l’aide d’un système de différenciation défini

Liver disease is an escalating global health issue. While liver transplantation is an effective mode of therapy, patient mortality has increased due to ...