This work was funded by the Institut Pasteur, the Bettencourt-Schueller foundation, Centre National de la Recherche Scientifique, University Paris Diderot, Agence Nationale de la Recherche (ANR-13-SAMA-0006; SynDivAutism), the Conny-Maeva Charitable Foundation, the Cognacq Jay Foundation, the Orange Foundation, and the Fondamental Foundation. L.G. is supported by an undergraduate fellowship from the Health Ministry. We acknowledge the help of BitPlane in particular Georgia Golfis, in the early stage of this work.

1. Neuronal Culture
Note: Fibroblast reprogramming in pluripotent stem cells, commitment to the dorsal telencephalon lineage, derivation, amplification, and banking of late cortical progenitors (LCP) were described in Boissart et al4. Neuronal differentiation of LCP-like cells was also performed according to Boissart et al4 with slight modifications. Other procedures have been developed for direct reprogramming of fibroblasts into induced&#160;pluripotent ...

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The quantification of the morphological features of pyramidal neurons relied on the software. The Filament Tracer interface was used for segmentation of neurons and spines, and the XT module was used for their analysis.
To analyze the accuracy of our technique, we first compared the measured morphologic parameters (length, area, and total spine volume when applicable), with those published using rat mature pyramidal neurons in culture 6, 7 and human brain tissues 3. Densi...

Dendritic spines of cortical pyramidal neurons are small and thin protrusions which are distributed along the basal and apical dendrites of these neuronal subtypes in rodent, primate, and human brain. They are the sites of most excitatory synapses and display key functions in learning and cognitive processes. The detailed structures of human dendritic spines have been technically studied by electron microscopy 2. However, such approach is time-consuming and represents heavy workload. More recently, a three-dimensional (3D) reconstruction of the morphology of dendritic spines has been reported in human brain cortex using specific software combined to large manual spine analysis3.
Green fluorescence protein (GFP) technology coupled to immunofluorescence represents an accurate tool for spine identification and shape measurement by fluorescence microscopy. This approach can be easily applied to cultured neurons. However, no data have been reported on the analysis of spine maturation and morphology on human neurons derived from induced&#160;pluripotent stem cells (iPSC).
The objective of this study was to describe a protocol, which allows dendritic spine imaging from cultured human neurons in vitro. GFP labeling, confocal microscopy and 3D analysis with the Filament Tracer module of Imaris software were used in the present protocol. Culture steps that are necessary to obtain cortical glutamatergic neurons of layers II to IV from neural stem cells (NSC) are also briefly described here.&#160;The entire protocol for human NSC production has already been published elsewhere 4.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>PD-PBS (1X), sans Calcium, Magnesium et Phenol Red</td>
			<td>Gibco/ Life Technologies</td>
			<td>14190169</td>
			<td></td>
		</tr>
		<tr>
			<td>Poly-L-Ornithine Solution Bioreagent</td>
			<td>Sigma Aldrich</td>
			<td>P4957</td>
			<td></td>
		</tr>
		<tr>
			<td>Mouse laminin</td>
			<td>Dutscher Dominique</td>
			<td>354232</td>
			<td></td>
		</tr>
		<tr>
			<td>N2 Supplement</td>
			<td>Gibco/ Life Technologies</td>
			<td>17502048</td>
			<td></td>
		</tr>
		<tr>
			<td>B-27 Supplement w/o vit A (50X)</td>
			<td>Gibco/ Life Technologies</td>
			<td>12587010</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM/NUT.MIX F-12 W/GLUT-I</td>
			<td>Gibco/ Life Technologies</td>
			<td>31331028</td>
			<td></td>
		</tr>
		<tr>
			<td>Neurobasal Med SFM</td>
			<td>Gibco/ Life Technologies</td>
			<td>21103049</td>
			<td></td>
		</tr>
		<tr>
			<td>2-mercaptoethanol</td>
			<td>Gibco/ Life Technologies</td>
			<td>31350-010</td>
			<td></td>
		</tr>
		<tr>
			<td>Pen-Steptomycin</td>
			<td>Gibco/ Life Technologies</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr>
			<td>GFP Rabbit Serum Polyclonal Antibody</td>
			<td>Gibco/ Life Technologies</td>
			<td>A-6455</td>
			<td></td>
		</tr>
		<tr>
			<td>Horse serum</td>
			<td>Gibco/ Life Technologies</td>
			<td>16050130</td>
			<td></td>
		</tr>
		<tr>
			<td>Alexa Fluor 488 Goat Anti-Rabbit&#160;</td>
			<td>Gibco/ Life Technologies</td>
			<td>A11034</td>
			<td></td>
		</tr>
		<tr>
			<td>Polyclonal Anti-betaIII tubulin antibody</td>
			<td>Millipore</td>
			<td>AB9354</td>
			<td></td>
		</tr>
		<tr>
			<td>Coverglass 13 mm</td>
			<td>VWR</td>
			<td>631-0150</td>
			<td></td>
		</tr>
		<tr>
			<td>Prolong Gold Antifade Reagent avec DAPI</td>
			<td>Gibco/ Life Technologies</td>
			<td>P36931</td>
			<td></td>
		</tr>
		<tr>
			<td>Tween(R) 20 Bioextra, Viscous Liquid</td>
			<td>Sigma Aldrich Chimie</td>
			<td>P7949</td>
			<td></td>
		</tr>
		<tr>
			<td>Triton X-100</td>
			<td>Sigma Aldrich Chimie</td>
			<td>X100-100ML</td>
			<td></td>
		</tr>
		<tr>
			<td>Human Fibroblasts</td>
			<td>Coriell Cell Line Biorepository</td>
			<td>GM 4603 and GM 1869</td>
			<td>Coriell Institute for Medical Research, Camden, NJ, USA</td>
		</tr>
		<tr>
			<td>Confocal laser scanning microscope</td>
			<td>Zeiss (Germany)</td>
			<td>LSM 700</td>
			<td></td>
		</tr>
		<tr>
			<td>Imaris Software</td>
			<td>Bitplane AG, Zurich</td>
			<td>6.4.0 version</td>
			<td>Filament Tracer and Imaris XT modules are necessary</td>
		</tr>
		<tr>
			<td>Huygens Software</td>
			<td>Huygens software, SVI, Netherlands</td>
			<td>Pro version</td>
			<td>Optional (for deconvolution testing)</td>
		</tr>
	</tbody>
</table>

three-dimensional quantification of dendritic spines from pyramidal neurons derived from human induced pluripotent stem cells

Dendritic spines are small protrusions that correspond to the post-synaptic compartments of excitatory synapses in the central nervous system. They are distributed along the dendrites. Their morphology is largely dependent on neuronal activity, and they are dynamic. Dendritic spines express glutamatergic receptors (AMPA and NMDA receptors) on their surface and at the levels of postsynaptic densities. Each spine allows the neuron to control its state and local activity independently. Spine morphologies have been extensively studied in glutamatergic pyramidal cells of the brain cortex, using both in vivo approaches and neuronal cultures obtained from rodent tissues. Neuropathological conditions can be associated to altered spine induction and maturation, as shown in rodent cultured neurons and one-dimensional quantitative analysis 1. The present study describes a protocol for the 3D quantitative analysis of spine morphologies using human cortical neurons derived from neural stem cells (late cortical progenitors). These cells were initially obtained from induced&#160;pluripotent stem cells. This protocol allows the analysis of spine morphologies at different culture periods, and with possible comparison between induced&#160;pluripotent stem cells obtained from control individuals with those obtained from patients with psychiatric diseases.

The present study describes a standardized protocol for spine quantification of cultured dendrites of pyramidal neurons derived from iPSC. This protocol allows the analysis of spine maturation on human neurons and its possible comparison with the maturation of spines in standard rodent neuronal cultures as well as in in vivo animal models.
Figure 1A represents a scheme of the different steps of culture which allow the production of cortical pyramidal neurons. Such sch...

Watch this Scientific Journal Video about Three-dimensional Quantification of Dendritic Spines from Pyramidal Neurons Derived from Human Induced Pluripotent Stem Cells at JoVE.com

Three-dimensional Quantification of Dendritic Spines from Pyramidal Neurons Derived from Human Induced Pluripotent Stem Cells

Dendritic spines of pyramidal neurons are the sites of most excitatory synapses in mammalian brain cortex. This method describes a 3D quantitative analysis of spine morphologies in human cortical pyramidal glutamatergic neurons derived from induced&#160;pluripotent stem cells.

Dendritic spines are small protrusions that correspond to the post-synaptic compartments of excitatory synapses in the central nervous system. They are ...

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Developmental Biology

11.3K Views.  Institut Pasteur. Dendritic spines of pyramidal neurons are the sites of most excitatory synapses in mammalian brain cortex. This method describes a 3D quantitative analysis of spine morphologies in human cortical pyramidal glutamatergic neurons derived from induced pluripotent stem cells.

Video: Three-dimensional Quantification of Dendritic Spines from Pyramidal Neurons Derived from Human Induced Pluripotent Stem Cells

Dendritic spines of pyramidal neurons are the sites of most excitatory synapses in mammalian brain cortex. This method describes a 3D quantitative analysis of spine morphologies in human cortical pyramidal glutamatergic neurons derived from induced&#160;pluripotent stem...

generating cortical pyramidal neurons from human neural stem cells

This video describes a method for preparing glass coverslips coated with polyornithine and laminin to enhance the adhesion and growth of neural stem cells. The technique involves sequential incubations and washes, facilitating the formation of a supportive matrix that promotes neuronal cell growth and differentiation, mimicking structures found in the...

Generating Cortical Pyramidal Neurons from Human Neural Stem Cells

replating differentiated neurons derived from human pluripotent stem cells

The video showcases a method to detach and replant human pluripotent stem cell-derived neurons using a mild proteolytic enzyme. After filtration and centrifugation, the neurons are replated on a coated multi-well plate for incubation, promoting attachment and...

Replating Differentiated Neurons Derived from Human Pluripotent Stem Cells

Apply at least 1 milliliter of proteolytic enzyme per 10-centimeter plate, and return the cells to the incubator for 40 to 45 minutes. During the incubation, check neurons on a phase-contrast microscope, and continue the protease treatment until the neural network completely detaches from the plate and starts to break apart. When the neurons have detached, stop digestion by adding 5 milliliters of fresh DMEM media for every 1 milliliter of...

co-culturing microglia and cortical neurons differentiated from human induced pluripotent stem cells

Co-Culturing Microglia and Cortical Neurons Differentiated from Human Induced Pluripotent Stem Cells

This protocol describes a methodology to differentiate microglia from human iPSCs and maintain them in co-culture with iPSC-derived cortical neurons in order to study mechanistic underpinnings of neuroimmune interactions using human neurons and...

serum free production of three-dimensional human hepatospheres from pluripotent stem cells

Serum Free Production of Three-dimensional Human Hepatospheres from Pluripotent Stem Cells

This protocol describes an approach to produce hepatospheres from human pluripotent stem cells using a defined culture system and cell self-assembly. This protocol is reproducible in a number of cell lines, cost effective and allows the production of stable human hepatospheres for biomedical...

generating neurons and glial cells from human induced pluripotent stem cell-derived embryoid bodies

This video demonstrates the process of differentiating embryoid bodies (EBs) into neuroepithelial aggregates and their subsequent division into neuronal and glial cells. This method allows the efficient generation of neuronal and glial cells in vitro, which serve as test systems for toxicity testing as well as assessment of different pathways involved in...

Generating Neurons and Glial Cells from Human Induced Pluripotent Stem Cell-Derived Embryoid Bodies

Prepare culture medium containing the following components. Then, use the medium to plate and dispatch neural stem cells or NSCs at a density of 50,000 cells per square centimeter, pipetting with slow rotating movements in order to reduce cell...

The next day, day three of the differentiation procedure, check the dish under the microscope at 10x magnification to ensure that the embryoid bodies are all attached. Then, gently perform a total medium change with complete NRI medium. Change the NRI medium every other day up to day seven when rosette-like neuroepithelial aggregates should be...

differentiating chondrocytes from peripheral blood-derived human induced pluripotent stem cells

Differentiating Chondrocytes from Peripheral Blood-derived Human Induced Pluripotent Stem Cells

We present a protocol to generate a chondrogenic lineage from human peripheral blood (PB) via induced pluripotent stem cells (iPSCs) using an integration-free method, which includes embryoid body (EB) formation, fibroblastic cells expansion, and chondrogenic...

generation of mice derived from induced pluripotent stem cells

Generation of Mice Derived from Induced Pluripotent Stem Cells

Generating induced pluripotent stem cell (iPSC) lines produces lines of differing developmental potential even when they pass standard tests for pluripotency. Here we describe a protocol to produce mice derived entirely from iPSCs, which defines the iPSC lines as possessing full...

application of live mitochondria staining in cell-sorting to purify hepatocytes derived from human induced pluripotent stem cells

Author Spotlight: Advancing Hepatocyte Purification from Human Induced Pluripotent Stem Cells for Regenerative Medicine

Hepatocytes derived from pluripotent stem cells can be purified through cell sorting, using a combination of mitochondrial and activated leukocyte cell adhesion molecule (ALCAM, also known as CD166)...

Purification of Human iPSC-Derived Hepatocytes by Mitochondrial-ALCAM Sorting

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the specification of telencephalic glutamatergic neurons from human pluripotent stem cells

The Specification of Telencephalic Glutamatergic Neurons from Human Pluripotent Stem Cells

This procedure yields telencephalic neurons by going through checkpoints which are similar to those observed during human development. The cells are allowed to spontaneously differentiate, are exposed to factors which push them towards the neural lineage, are isolated, and are plated onto coverslips to allow for terminal differentiation and...

in vitro neuromuscular junction induced from human induced pluripotent stem cells

In vitro Neuromuscular Junction Induced from Human Induced Pluripotent Stem Cells

Here we provide a protocol to generate in vitro NMJs from human induced pluripotent stem cells (iPSCs). This method can induce NMJs with mature morphology and function in 1 month in a single well. The resulting NMJs could potentially be used to model related diseases, to study pathological mechanisms or to screen drug compounds for...

vascular organoid generation from human-induced pluripotent stem cells

Author Spotlight: Improving Reproducibility in Vascular Organoids Using ROCK Inhibitors and Microwell Confinement

This protocol presents a method for generating vascular organoids using human pluripotent stem...

Vascular Organoid Generation from Human-Induced Pluripotent Stem Cells

fluorescence-activated cell sorting of hepatocytes derived from human induced pluripotent stem cells

Fluorescence-Activated Cell Sorting of Hepatocytes Derived from Human Induced Pluripotent Stem Cells

generating postganglionic sympathetic neurons from human pluripotent stem cells

This video demonstrates an in vitro method to generate postganglionic sympathetic neurons from human pluripotent stem cells (hPSCs). hPSCs are differentiated into neural crest cells (NCCs) on a basement membrane matrix support using a differentiation medium. The NCCs are then dissociated and formed into spheroids using another differentiation medium. Finally, the spheroids are transformed into postganglionic sympathetic neurons using a sympathetic neuron...

Generating Postganglionic Sympathetic Neurons from Human Pluripotent Stem Cells

chondrogenic pellet formation from cord blood-derived induced pluripotent stem cells

Chondrogenic Pellet Formation from Cord Blood-derived Induced Pluripotent Stem Cells

Here, we propose a protocol for chondrogenic differentiation from cord blood mononuclear cell-derived human induced pluripotent stem...

generation and maintenance of primate induced pluripotent stem cells derived from urine

Generation and Maintenance of Primate Induced Pluripotent Stem Cells Derived from Urine

The present protocol describes a method to isolate, expand, and reprogram human and non-human primate urine-derived cells to induced pluripotent stem cells (iPSCs), as well as instructions for feeder-free maintenance of the newly generated iPSCs.

synaptic microcircuit modeling with 3d cocultures of astrocytes and neurons from human pluripotent stem cells

Synaptic Microcircuit Modeling with 3D Cocultures of Astrocytes and Neurons from Human Pluripotent Stem Cells

In this protocol, we aim to describe a reproducible method for combining dissociated human pluripotent stem cell derived neurons and astrocytes together into 3D sphere cocultures, maintaining these spheres in free floating conditions, and subsequently measuring synaptic circuit activity of the spheres with immunoanalysis and multielectrode array...

Generation of Integration-free Human Induced Pluripotent Stem Cells Using Hair-derived Keratinocytes

Recent advances in reprogramming allow us to turn somatic cells into human induced pluripotent stem cells (hiPSCs). Disease modeling using patient-specific hiPSCs allows the study of the underlying mechanism for pathogenesis, also providing a platform for the development of in vitro drug screening and gene therapy to improve treatment options. The promising potential of hiPSCs for regenerative medicine is also evident from the increasing number of publications (>7000) on iPSCs in recent years. Various cell types from distinct lineages have been successfully used for hiPSC generation, including skin fibroblasts, hematopoietic cells and epidermal keratinocytes. While skin biopsies and blood collection are routinely performed in many labs as a source of somatic cells for the generation of hiPSCs, the collection and subsequent derivation of hair keratinocytes are less commonly used. Hair-derived keratinocytes represent a non-invasive approach to obtain cell samples from patients. Here we outline a simple non-invasive method for the derivation of keratinocytes from plucked hair. We also provide instructions for maintenance of keratinocytes and subsequent reprogramming to generate integration-free hiPSC using episomal vectors.

This manuscript provides a step-by-step procedure for the derivation and maintenance of human keratinocytes from plucked hair and subsequent generation of integration-free human induced pluripotent stem cells (hiPSCs) by episomal vectors.

Recent advances in reprogramming allow us to turn somatic cells into human induced pluripotent stem cells (hiPSCs). Disease modeling using ...

Feeder-free Derivation of Melanocytes from Human Pluripotent Stem Cells

Human pluripotent stem cells (hPSCs) represent a platform to study human development in vitro under both normal and disease conditions. Researchers can direct the differentiation of hPSCs into the cell type of interest by manipulating the culture conditions to recapitulate signals seen during development. One such cell type is the melanocyte, a pigment-producing cell of neural crest (NC) origin responsible for protecting the skin against UV irradiation. This protocol presents an extension of a currently available in vitro Neural Crest differentiation protocol from hPSCs to further differentiate NC into fully pigmented melanocytes. Melanocyte precursors can be enriched from the Neural Crest protocol via a timed exposure to activators of WNT, BMP, and EDN3 signaling under dual-SMAD-inhibition conditions. The resultant melanocyte precursors are then purified and matured into fully pigmented melanocytes by culture in a selective medium. The resultant melanocytes are fully pigmented and stain appropriately for proteins characteristic of mature melanocytes.

This work describes an in vitro differentiation protocol to produce pigmented, mature melanocytes from human pluripotent stem cells via a neural crest and melanoblast intermediate stage using a feeder-free, 25 day protocol.

Human pluripotent stem cells (hPSCs) represent a platform to study human development in vitro under both normal and disease conditions. Researchers can ...

Generation of Induced Pluripotent Stem Cells from Human Melanoma Tumor-infiltrating Lymphocytes

Adoptive transfer of ex vivo expanded autologous tumor-infiltrating lymphocytes (TILs) can mediate durable and complete responses in significant subsets of patients with metastatic melanoma. Major obstacles of this approach are the reduced viability of transferred T cells, caused by telomere shortening, and the limited number of TILs obtained from patients. Less-differentiated T cells with long telomeres would be an ideal T cell subset for adoptive T cell therapy;however, generating large numbers of these less-differentiated T cells is problematic. This limitation of adoptive T cell therapy can be theoretically overcome by using induced pluripotent stem cells (iPSCs) that self-renew, maintain pluripotency, have elongated telomeres, and provide an unlimited source of autologous T cells for immunotherapy. Here, we present a protocol to generate iPSCs using Sendai virus vectors for the transduction of reprogramming factors into TILs. This protocol generates fully reprogrammed, vector-free clones. These TIL-derived iPSCs might be able to generate less-differentiated patient- and tumor-specific T cells for adoptive T cell therapy.

The goal of this protocol is to show the protocol for reprogramming melanoma tumor-infiltrating lymphocytes into induced pluripotent stem cells.

Adoptive transfer of ex vivo expanded autologous tumor-infiltrating lymphocytes (TILs) can mediate durable and complete responses in significant subsets ...

In this study, we used peripheral blood cells (PBCs) as seed cells to produce chondrocytes via induced pluripotent stem cells (iPSCs) in an integration-free method. Following embryoid body (EB) formation and fibroblastic cell expansion, the iPSCs are induced for chondrogenic differentiation for 21 days under serum-free and xeno-free conditions. After chondrocyte induction, the phenotypes of the cells are evaluated by morphological, immunohistochemical, and biochemical analyses, as well as by the quantitative real-time PCR examination of chondrogenic differentiation markers. The chondrogenic pellets show positive alcian blue and toluidine blue staining. The immunohistochemistry of collagen II and X staining is also positive. The sulfated glycosaminoglycan (sGAG) content and the chondrogenic differentiation markers COLLAGEN 2 (COL2), COLLAGEN 10 (COL10), SOX9, and AGGRECAN are significantly upregulated in chondrogenic pellets compared to hiPSCs and fibroblastic cells. These results suggest that PBCs can be used as seed cells to generate iPSCs for cartilage repair, which is patient-specific and cost-effective.

We present a protocol to generate a chondrogenic lineage from human peripheral blood (PB) via induced pluripotent stem cells (iPSCs) using an integration-free method, which includes embryoid body (EB) formation, fibroblastic cells expansion, and chondrogenic induction.

In this study, we used peripheral blood cells (PBCs) as seed cells to produce chondrocytes via induced pluripotent stem cells (iPSCs) in an ...

Human articular cartilage lacks the ability to repair itself. Cartilage degeneration is thus treated not by curative but by conservative treatments. Currently, efforts are being made to regenerate damaged cartilage with ex vivo expanded chondrocytes or bone marrow-derived mesenchymal stem cells (BMSCs). However, the restricted viability and instability of these cells limit their application in cartilage reconstruction. Human induced pluripotent stem cells (hiPSCs) have received scientific attention as a new alternative for regenerative applications. With unlimited self-renewal ability and multipotency, hiPSCs have been highlighted as a new replacement cell source for cartilage repair. However, obtaining a high quantity of high-quality chondrogenic pellets is a major challenge to their clinical application. In this study, we used embryoid body (EB)-derived outgrowth cells for chondrogenic differentiation. Successful chondrogenesis was confirmed by PCR and staining with alcian blue, toluidine blue, and antibodies against collagen types I and II (COL1A1 and COL2A1, respectively). We provide a detailed method for the differentiation of cord blood mononuclear cell-derived iPSCs (CBMC-hiPSCs) into chondrogenic pellets.

Here, we propose a protocol for chondrogenic differentiation from cord blood mononuclear cell-derived human induced pluripotent stem cells.

Human articular cartilage lacks the ability to repair itself. Cartilage degeneration is thus treated not by curative but by conservative treatments. ...

Rapid, Directed Differentiation of Retinal Pigment Epithelial Cells from Human Embryonic or Induced Pluripotent Stem Cells

We describe a robust method to direct the differentiation of pluripotent stem cells into retinal pigment epithelial cells (RPE). The purpose of providing a detailed and thorough protocol is to clearly demonstrate each step and to make this readily available to researchers in the field. This protocol results in a homogenous layer of RPE with minimal or no manual dissection needed. The method presented here has been shown to be effective for induced pluripotent stem cells (iPSC) and human embryonic stem cells. Additionally, we describe methods for cryopreservation of intermediate cell banks that allow long-term storage. RPE generated using this protocol might be useful for iPSC disease-in-a-dish modeling or clinical application.

This protocol describes how to produce retinal pigment epithelial cells (RPE) from pluripotent stem cells. The method uses a combination of growth factors and small molecules to direct the differentiation of stem cells into immature RPE in fourteen days and mature, functional RPE after three months.

We describe a robust method to direct the differentiation of pluripotent stem cells into retinal pigment epithelial cells (RPE). The purpose of providing ...

A barrier to our understanding of how various cell types and signals contribute to synaptic circuit function is the lack of relevant models for studying the human brain. One emerging technology to address this issue is the use of three dimensional (3D) neural cell cultures, termed &#39;organoids&#39; or &#39;spheroids&#39;, for long term preservation of intercellular interactions including extracellular adhesion molecules. However, these culture systems are time consuming and not systematically generated. Here, we detail a method to rapidly and consistently produce 3D cocultures of neurons and astrocytes from human pluripotent stem cells. First, pre-differentiated astrocytes and neuronal progenitors are dissociated and counted. Next, cells are combined in sphere-forming dishes with a Rho-Kinase inhibitor and at specific ratios to produce spheres of reproducible size. After several weeks of culture as floating spheres, cocultures (&#39;asteroids&#39;) are finally sectioned for immunostaining or plated upon multielectrode arrays to measure synaptic density and strength. In general, it is expected that this protocol will yield 3D neural spheres that display mature cell-type restricted markers, form functional synapses, and exhibit spontaneous synaptic network burst activity. Together, this system permits drug screening and investigations into mechanisms of disease in a more suitable model compared to monolayer cultures.

In this protocol, we aim to describe a reproducible method for combining dissociated human pluripotent stem cell derived neurons and astrocytes together into 3D sphere cocultures, maintaining these spheres in free floating conditions, and subsequently measuring synaptic circuit activity of the spheres with immunoanalysis and multielectrode array recordings.

A barrier to our understanding of how various cell types and signals contribute to synaptic circuit function is the lack of relevant models for studying ...

Generation of 3D Skin Organoid from Cord Blood-derived Induced Pluripotent Stem Cells

The skin is the body&#8217;s largest organ and has many functions. The skin acts as a physical barrier and protector of the body and regulates bodily functions. Biomimetics is the imitation of the models, systems, and elements of nature for the purpose of solving complex human problems1. Skin biomimetics is a useful tool for in vitro disease research and in vivo regenerative medicine. Human induced pluripotent stem cells (iPSCs) have the characteristic of unlimited proliferation and the ability of differentiation to three germ layers. Human iPSCs are generated from various primary cells, such as blood cells, keratinocytes, fibroblasts, and more. Among them, cord blood mononuclear cells (CBMCs) have emerged as an alternative cell source from the perspective of allogeneic regenerative medicine. CBMCs are useful in regenerative medicine because human leukocyte antigen (HLA) typing is essential to the cell banking system. We provide a method for the differentiation of CBMC-iPSCs into keratinocytes and fibroblasts and for generation of a 3D skin organoid. CBMC-iPSC-derived keratinocytes and fibroblasts have characteristics similar to a primary cell line. The 3D skin organoids are generated by overlaying an epidermal layer onto a dermal layer. By transplanting this 3D skin organoid, a humanized mice model is generated. This study shows that a 3D human iPSC-derived skin organoid may be a novel, alternative tool for dermatologic research in vitro and in vivo.

We propose a protocol that shows how to differentiate induced pluripotent stem cell-derived keratinocytes and fibroblasts and generate a 3D skin organoid, using these keratinocytes and fibroblasts. This protocol contains an additional step of generating a humanized mice model. The technique presented here will improve dermatologic research.

The skin is the body&#8217;s largest organ and has many functions. The skin acts as a physical barrier and protector of the body and regulates bodily ...

In Vitro Generation of Somite Derivatives from Human Induced Pluripotent Stem Cells

In response to signals such as WNTs, bone morphogenetic proteins (BMPs), and sonic hedgehog (SHH) secreted from surrounding tissues, somites (SMs) give rise to multiple cell types, including the myotome (MYO), sclerotome (SCL), dermatome (D), and syndetome (SYN), which in turn develop into skeletal muscle, axial skeleton, dorsal dermis, and axial tendon/ligament, respectively. Therefore, the generation of SMs and their derivatives from human induced pluripotent stem cells (iPSCs) is critical to obtain pluripotent stem cells (PSCs) for application in regenerative medicine and for disease research in the field of orthopedic surgery. Although the induction protocols for MYO and SCL from PSCs have been previously reported by several researchers, no study has yet demonstrated the induction of SYN and D from iPSCs. Therefore, efficient induction of fully competent SMs remains a major challenge. Here, we recapitulate human SM patterning with human iPSCs in vitro by mimicking the signaling environment during chick/mouse SM development, and report on methods of systematic induction of SM derivatives (MYO, SCL, D, and SYN) from human iPSCs under chemically defined conditions through the presomitic mesoderm (PSM) and SM states. Knowledge regarding chick/mouse&#160;SM development was successfully applied to the induction of SMs with human iPSCs. This method could be a novel tool for studying human somitogenesis and patterning without the use of embryos and for cell-based therapy and disease modeling.

We present here a protocol for the differentiation of human induced pluripotent stem cells into each somite derivative (myotome, sclerotome, dermatome, and syndetome) in chemically defined conditions, which has applications in future disease modeling and cell-based therapies in orthopedic surgery.

In response to signals such as WNTs, bone morphogenetic proteins (BMPs), and sonic hedgehog (SHH) secreted from surrounding tissues, somites (SMs) give ...

The development of renewable sources of liver tissue is required to improve cell-based modelling, and develop human tissue&#160;for transplantation. Human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs) represent promising sources of human liver spheres. We have developed a serum free and defined method of cellular differentiation to generate three-dimensional human liver spheres formed from human pluripotent stem cells. A potential limitation of the technology is the production of dense spheres with dead material inside. In order to circumvent this, we have employed agarose microwell technology at defined cell densities to control the size of the 3D spheres, preventing the generation of apoptotic and/or necrotic cores.&#160; Notably, the spheres generated by our approach display liver function and stable phenotype, representing a valuable resource for basic and applied scientific research. We believe that our approach could be used as a platform technology to develop further tissues to model and treat human disease and in the future may permit the generation of human tissue with complex tissue architecture.

This protocol describes an approach to produce hepatospheres from human pluripotent stem cells using a defined culture system and cell self-assembly. This protocol is reproducible in a number of cell lines, cost effective and allows the production of stable human hepatospheres for biomedical application.

The development of renewable sources of liver tissue is required to improve cell-based modelling, and develop human tissue&#160;for transplantation. Human ...