Name: brain organoid generation from induced pluripotent stem cells in home-made mini bioreactors
Uploaded: 2021-12-11T15:00:00
Description: Watch this Scientific Journal Video about Brain Organoid Generation from Induced Pluripotent Stem Cells in Home-Made Mini Bioreactors at JoVE.com

This work was supported by grant 075-15-2019-1669 from the Ministry of Science and Higher Education of the Russian Federation (RT-PCR analysis) and by grant No. 19-15-00425 from the Russian Science Foundation (for all other work). The authors also thank Pavel Belikov for his help with the video editing. Figures in the manuscript were created with BioRender.com.

NOTE : Use sterile technique throughout the protocol, excluding steps 1.2 and 1.3. Warm all culture media and solutions to 37 &#176;C before applying to cells or organoids. Cultivate cells in a CO2 incubator at 37 &#176;C in 5% CO2 upon 80% humidity. The protocol scheme is shown in Figure 1.
1. Transforming Petri dishes into mini bioreactors
<ol>
	<li>Cut sterile 15 mL centrifuge tubes in rings of 7-8 mm in height; autoclav...

<ol>
	<li>Marchetto, M. C., Winner, B., Gage, F. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pluripotent+stem+cells+in+neurodegenerative+and+neurodevelopmental+diseases.">Pluripotent stem cells in neurodegenerative and neurodevelopmental diseases.</a> Human Molecular Genetics. 19, 71-76 (2010).</li><li>Lee, C. T., Bendriem, R. M., Wu, W. W., Shen, R. 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A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cerebral+organoids+model+human+brain+development+and+microcephaly.">Cerebral organoids model human brain development and microcephaly.</a> Nature. 501 (7467), 373-379 (2013).</li><li>Xiang, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fusion+of+regionally+specified+hPSC+derived+organoids+models+human+brain+development+and+interneuron+migration.">Fusion of regionally specified hPSC derived organoids models human brain development and interneuron migration.</a> Cell Stem Cell. 21, 383-398 (2017).</li><li>Muguruma, K., Nishiyama, A., Kawakami, H., Hashimoto, K., Sasai, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Self-organization+of+polarized+cerebellar+tissue+in+3D+culture+of+human+pluripotent+stem+cells.">Self-organization of polarized cerebellar tissue in 3D culture of human pluripotent stem cells.</a> Cell Reports. 10 (4), 537-550 (2015).</li><li>Qian, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Brain+region+specific+organoids+using+mini+bioreactors+for+modeling+ZIKV+exposure.">Brain region specific organoids using mini bioreactors for modeling ZIKV exposure.</a> Cell. 165 (5), 1238-1254 (2016).</li><li>Qian, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Generation+of+human+brain+region+specific+organoids+using+a+miniaturized+spinning+bioreactor.">Generation of human brain region specific organoids using a miniaturized spinning bioreactor.</a> Nature Protocols. 13 (3), 565-580 (2018).</li><li>Jo, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Midbrain+like+organoids+from+human+pluripotent+stem+cells+contain+functional+dopaminergic+and+neuro+melanin+producing+neurons.">Midbrain like organoids from human pluripotent stem cells contain functional dopaminergic and neuro melanin producing neurons.</a> Cell Stem Cell. 19 (2), 248-257 (2016).</li><li>Sakaguchi, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Generation+of+functional+hippocampal+neurons+from+self-organizing+human+embryonic+stem+cell+derived+dorsomedial+telencephalic+tissue.">Generation of functional hippocampal neurons from self-organizing human embryonic stem cell derived dorsomedial telencephalic tissue.</a> Nature Communication. 6 (1), 8896 (2015).</li><li>Di Lullo, E., Kriegstein, A. 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G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pluripotent+stem+cell+platforms+for+drug+discovery.">Pluripotent stem cell platforms for drug discovery.</a> Trends in Molecular Medicine. 24 (9), 805-820 (2018).</li><li>Dang, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Zika+virus+depletes+neural+progenitors+in+human+cerebral+organoids+through+activation+of+the+innate+immune+receptor+TLR3.">Zika virus depletes neural progenitors in human cerebral organoids through activation of the innate immune receptor TLR3.</a> Cell Stem Cell. 19 (2), 258-265 (2016).</li><li>Tiwari, S. K., Wang, S., Smith, D., Carlin, A. F., Rana, T. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Revealing+tissue-specific+SARS-CoV-2+infection+and+host+responses+using+human+stem+cell-derived+lung+and+cerebral+organoids.">Revealing tissue-specific SARS-CoV-2 infection and host responses using human stem cell-derived lung and cerebral organoids.</a> Stem Cell Reports. 16 (3), 437-445 (2021).</li><li>Ao, Z., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=One-stop+microfluidic+assembly+of+human+brain+organoids+to+model+prenatal+cannabis+exposure.">One-stop microfluidic assembly of human brain organoids to model prenatal cannabis exposure.</a> Analytical Chemistry. 92 (6), 4630-4638 (2020).</li><li>Di Nardo, P., Parker, G. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Stem+cell+standardization.">Stem cell standardization.</a> Stem Cells Development. 20 (3), 375-377 (2011).</li><li>Jo, J., Xiao, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Midbrain+like+organoids+from+human+pluripotent+stem+cells+contain+functional+dopaminergic+and+neuro+melanin+producing+neurons.">Midbrain like organoids from human pluripotent stem cells contain functional dopaminergic and neuro melanin producing neurons.</a> Cell Stem Cell. 19 (2), 248-257 (2016).</li><li>Matsui, T. K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Six-month+cultured+cerebral+organoids+from+human+ES+cells+contain+matured+neural+cells.">Six-month cultured cerebral organoids from human ES cells contain matured neural cells.</a> Neuroscience Letters. 670, 75-82 (2018).</li><li>Trujillo, C. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Complex+oscillatory+waves+emerging+from+cortical+organoids+model+early+human+brain+network+development.">Complex oscillatory waves emerging from cortical organoids model early human brain network development.</a> Cell Stem Cell. 25 (4), 558-569 (2019).</li><li>Eremeev, A. V., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Necessity+Is+the+mother+of+invention&#8221;+or+inexpensive,+reliable,+and+reproducible+protocol+for+generating+organoids.">Necessity Is the mother of invention&#8221; or inexpensive, reliable, and reproducible protocol for generating organoids.</a> Biochemistry (Moscow). 84 (3), 321-328 (2019).</li><li>Qian, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Generation+of+human+brain+region&#8211;specific+organoids+using+a+miniaturized+spinning+bioreactor.">Generation of human brain region&#8211;specific organoids using a miniaturized spinning bioreactor.</a> Nature Protocols. 13, 565-580 (2018).</li><li>Matsui, T. K., Tsuru, Y., Hasegawa, K., Kuwako, K. I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vascularization+of+human+brain+organoids.">Vascularization of human brain organoids.</a> Stem Cells. 39 (8), 1017-1024 (2021).</li><li>Hall, G. N., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Patterned,+organoid-based+cartilaginous+implants+exhibit+zone+specific+functionality+forming+osteochondral-like+tissues+in+vivo.">Patterned, organoid-based cartilaginous implants exhibit zone specific functionality forming osteochondral-like tissues in vivo.</a> Biomaterials. 273, 120820 (2021).</li><li>Zachos, N. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+enteroids/colonoids+and+intestinal+organoids+functionally+recapitulate+normal+intestinal+physiology+and+pathophysiology.">Human enteroids/colonoids and intestinal organoids functionally recapitulate normal intestinal physiology and pathophysiology.</a> Journal of Biological Chemistry. 291, 3759-3766 (2016).</li><li>Eremeev, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cerebral+organoids&#8212;challenges+to+establish+a+brain+prototype.">Cerebral organoids&#8212;challenges to establish a brain prototype.</a> Cells. 10 (7), 1790 (2021).</li><li>Kadoshima, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Self-organization+of+axial+polarity,+inside-out+layer+pattern,+and+species-specific+progenitor+dynamics+in+human+ES+Cell-derived+neocortex.">Self-organization of axial polarity, inside-out layer pattern, and species-specific progenitor dynamics in human ES Cell-derived neocortex.</a> Proceedings of the National Academy of Sciences U. S. A. 110, 20284-20289 (2013).</li></ol>

The described protocol has two crucial steps allowing the generation of high-quality organoids of uniform size. First, the organoids grow from spheroids which are near identical in cell number and cell maturity. Second, the home-made bioreactors provide each organoid a uniform environment, where organoids do not crowd or stick together.
The cell quality and state of cell maturation are essential to perform the protocol. It is critical to start neuronal differentiation at 75-90% confluence of i...

Human iPSC-derived models are widely used in the studies of neurodevelopmental and neurodegenerative disorders1. Over the past decade, 3D brain tissue models, so-called brain organoids, essentially complemented traditional 2D neuronal cultures2. The organoids recapitulate to some extent the 3D architecture of the embryonic brain and allow more precise modeling. Many protocols are published for the generation of organoids representing different brain regions: cerebral cortex3,4,5, cerebellum6, midbrain, forebrain, hypothalamus7,8,9, and hippocampus10. There have been multiple examples of using organoids to study human nervous system diseases11. Also, the organoids were implemented in drug discoveries12 and used in studies of infectious diseases, including SARS-Cov-213,14.
The brain organoids can reach up to several millimeters in diameter. So, the inner zone of the organoid may suffer from hypoxia or malnutrition and eventually become necrotic. Therefore, many protocols include special bioreactors8, shakers, or microfluidic systems15. These devices may require large volumes of expensive cell culture media. Also, the cost of such equipment is usually high. Some bioreactors consist of many mechanical parts that make them difficult to sterilize for reuse.
Most protocols suffer from the &#34;batch effect&#34;16, which generates significant variability among organoids obtained from the identical iPSCs. This variability hinders drug testing or preclinical studies requiring uniformity. The high yield of organoids enough to select organoids of uniform size may partially solve this problem.
The time factor is also a significant problem. Matsui et al. (2018) showed that brain organoids require at least six months to reach maturity17. Trujillo et al. (2019) also demonstrated that electrophysiological activity occurred in organoids only after six months of cultivation18. Due to the long organoid maturation time, the researchers often launch new differentiation before completing the previous one. Multiple parallel processes of differentiation require additional expenses, equipment, and laboratory space.
We have recently developed a mini bioreactor that mainly solves the problems mentioned above19. This home-made bioreactor consists of an ultra-low adhesion or untreated Petri dish with a plastic knob in the center. This plastic knob prevents crowding of organoids and their conglutination in the center of the Petri dish, which is caused by the rotation of the shaker. This paper describes how this inexpensive and simple home-made mini bioreactor allows generating high-quality brain organoids in large quantities.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Advanced DMEM/F-12</td>
			<td>Gibco</td>
			<td>12634010</td>
			<td>DMEM/F-12</td>
		</tr>
		<tr>
			<td>AggreWell400</td>
			<td>STEMCELL Technologies Inc</td>
			<td>34425</td>
			<td>24-well culture plate with microwells</td>
		</tr>
		<tr>
			<td>B-27 Supplement</td>
			<td>Gibco</td>
			<td>17504044</td>
			<td>Neuronal supplement B</td>
		</tr>
		<tr>
			<td>GlutaMAX Supplement</td>
			<td>Gibco</td>
			<td>35050061</td>
			<td>200 mM L-alanyl-L-glutamine</td>
		</tr>
		<tr>
			<td>Human BDNF</td>
			<td>Miltenyi Biotec</td>
			<td>130-096-285</td>
			<td></td>
		</tr>
		<tr>
			<td>Human FGF-2</td>
			<td>Miltenyi Biotec</td>
			<td>130-093-839</td>
			<td></td>
		</tr>
		<tr>
			<td>Human GDNF</td>
			<td>Miltenyi Biotec</td>
			<td>130-096-290</td>
			<td></td>
		</tr>
		<tr>
			<td>KnockOut Serum Replacement</td>
			<td>Gibco</td>
			<td>10828028</td>
			<td>Serum replacement</td>
		</tr>
		<tr>
			<td>mTESR1</td>
			<td>STEMCELL Technologies Inc</td>
			<td>85850</td>
			<td>Pliripotent stem cell medium</td>
		</tr>
		<tr>
			<td>N2 Supplement</td>
			<td>Gibco</td>
			<td>17502001</td>
			<td></td>
		</tr>
		<tr>
			<td>Neurobasal Medium</td>
			<td>Gibco</td>
			<td>21103049</td>
			<td>Basal medium for neuronal cell maintenance</td>
		</tr>
		<tr>
			<td>Penicillin-Streptomycin Solution</td>
			<td>Gibco</td>
			<td>15140130</td>
			<td></td>
		</tr>
		<tr>
			<td>Plasmocin</td>
			<td>InvivoGen</td>
			<td>ant-mpt-1</td>
			<td>Antimicrobials</td>
		</tr>
		<tr>
			<td>Purmorphamine</td>
			<td>EMD Millipore</td>
			<td>540220</td>
			<td></td>
		</tr>
		<tr>
			<td>StemMACS Y27632</td>
			<td>Miltenyi Biotec</td>
			<td>130-106-538</td>
			<td>Y27632</td>
		</tr>
		<tr>
			<td>StemMACS Dorsomorphin</td>
			<td>Miltenyi Biotec</td>
			<td>130-104-466</td>
			<td>Dorsomorphin</td>
		</tr>
		<tr>
			<td>StemMACS LDN-193189</td>
			<td>Miltenyi Biotec</td>
			<td>130-106-540</td>
			<td>LDN-193189</td>
		</tr>
		<tr>
			<td>StemMACS SB431542</td>
			<td>Miltenyi Biotec</td>
			<td>130-106-543</td>
			<td>SB431542</td>
		</tr>
		<tr>
			<td>Trypan Blue Solution</td>
			<td>Gibco</td>
			<td>15250061</td>
			<td></td>
		</tr>
		<tr>
			<td>Versen solution</td>
			<td>Gibco</td>
			<td>15040066</td>
			<td>0.48 mM EDTA in PBS</td>
		</tr>
		<tr>
			<td>&#946;-mercaptoethanol</td>
			<td>Gibco</td>
			<td>31350010</td>
			<td></td>
		</tr>
	</tbody>
</table>

brain organoid generation from induced pluripotent stem cells in home-made mini bioreactors

The iPSC-derived brain organoid is a promising technology for in vitro modeling the pathologies of the nervous system and drug screening. This technology has emerged recently. It is still in its infancy and has some limitations unsolved yet. The current protocols do not allow obtaining organoids to be consistent enough for drug discovery and preclinical studies. The maturation of organoids can take up to a year, pushing the researchers to launch multiple differentiation processes simultaneously. It imposes additional costs for the laboratory in terms of space and equipment. In addition, brain organoids often have a necrotic zone in the center, which suffers from nutrient and oxygen deficiency. Hence, most current protocols use a circulating system for culture medium to improve nutrition.
Meanwhile, there are no inexpensive dynamic systems or bioreactors for organoid cultivation. This paper describes a protocol for producing brain organoids in compact and inexpensive home-made mini bioreactors. This protocol allows obtaining high quality organoids in large quantities.

The protocol scheme is shown in Figure 1. The protocol included five media in which iPSCs differentiated into brain organoids during at least one month. The differentiation was started then iPSCs reached the 75-90% confluence (Figure 2A,B). The first signs of differentiation towards neurons were observed on days 10-11 of iPSC cultivation in medium A when cells began to cluster into &#34;rosettes&#34; (Figure 2C). At...

Watch this Scientific Journal Video about Brain Organoid Generation from Induced Pluripotent Stem Cells in Home-Made Mini Bioreactors at JoVE.com

Brain Organoid Generation from Induced Pluripotent Stem Cells in Home-Made Mini Bioreactors

Here we describe a protocol for generating brain organoids from human induced pluripotent stem cells (iPSCs). To obtain brain organoids in large quantities and of high quality, we use home-made mini bioreactors.

The iPSC-derived brain organoid is a promising technology for in vitro modeling the pathologies of the nervous system and drug screening. This technology ...

To date, the cerebral organoids differentiated from pluripotent stem cells is an vitro 3D model closest to the native human brain tissue. Additionally, cerebral organoids are equally suitable for modeling various central nervous system pathologies, testing pharmacologically-active substances, and also for use in regenerative medicine. Meanwhile, this technology is still at the initial stage of development.The protocol can be divided into two groups depending on the method of obtaining aggregates and the further cultivation with differentiation. The first includes protocol and schemes of differentiation, different in the cultivation time and differentiation inducers with subsequent maturation of organoid in the shaker in special low-adhesion devices like market tubes or plates. Another group includes using a special bioreactors.Analysis of various protocols has shown that organoids should be cultivated under conditions with circulating nutrient medium. However, the absence of simple and inexpensive systems for obtaining organoid with a standard size and morphology require the development of such devices for scaling the process. In this work, we describe our method for obtaining and testing simple and inexpensive mini bioreactors that make it possible to obtain large quantities of high-quality organoids.Cut the sterile 15 milliliters centrifuge tubes into the rings, 7 or 8 millimeters in height. Autoclave the rings. Break low-aggregations on treated or microbiological Petri dishes into crumbs.Dissolve about 1 grams of plastic crumbs in 10 milliliters of chloroform overnight to prepare a liquid plastic. Make a plastic knob in the center of a sterile ultra low-adhesion 6 centimeters Petri dish. There are two equally suitable ways.The first, put the autoclave in a plastic ring on a center and apply half milliliters of liquid plastic to the inside of the ring. The second, without any plastic rings drop half milliliters of liquid plastic on the center of the Petri dish. Leave the dishes open for 2 or 3 hours in a laminar flow hood until complete dryness.Cultivate induced pluripotent stem cells in the medium for pluripotent stem cells, up to 75 or 90%confluence in the 35 millimeters Petri dishes, pre-coated with a matrix dissolved in cold Dulbecco Modified Eagle Medium, and Fisher-12 medium. Prepare medium A plus serum replacement. Cultivate induced pluripotent stem cells for 1 day in the medium with serum replacement.Change medium for pluripotent stem cells to a serum replacement medium at the day zero of differentiation. Prepare medium A.Change the medium to medium A at day 2 of differentiation. Cultivate cells in medium A for 2 weeks, refreshing medium in Petri dishes every 2 day.At day 14, start the formation of spheroid using a special 24-well culture plate which contains approximately 1, 200 microwells in each well. Prepare a 24-well culture plate with microwells. Add to each well 1 milliliter of medium A, centrifuge briefly at 1, 300g for 5 minutes in a swinging-bucket rotor fitted with plate holder.Control under the microscope that there are no bubbles in microwells. Prepare the medium B.Remove the medium from the Petri dish. For the cell detachment, treat the cells with 1.5 milliliters EDTA solution prepared on PBS.Control the cell detachment under the microscope. Harvest the cell into 15 milliliter tube. Add 5 milliliter mixed Dulbecco and Fisher medium in the tube towards the cells.Centrifuge at 200g for 5 minutes. Remove the supernatant and re-suspend cells in 2 milliliter of medium B.Transfer the cells suspension containing 1 billion cells into each well of a 24-well plate with microwells. Gently pipette cells up to and down several times and centrifuge briefly 100g for 1 minute to capture cell in microwells.Control under the microscope that the cell are evenly distributed in microwells. Incubate the plate overnight for cell aggregation in spheroids. The next morning, day 15, check under the microscopes the quality of spheroids, which are transparent and smooth if healthy.Carefully collect the spheroids from each well into a 15 milliliter tube, leave the spheroids to precipitate by gravity for 2 and 3 minutes, and then remove the supernatant. Add to the spheroids 2 milliliters of the matrix, thawed and ex tempore on ice. Mix gently by pipetting and incubate at room temperature for 30 minutes.To wash excess of the matrix, add to the tube 8 milliliters of medium B.Pipette gently, then centrifuge the tube for 1 minutes at 100g. Remove the supernatant. Add to the tube 20 milliliters of medium B, pipette gently, then split the spheroid suspension between mini bioreactors.Then place the mini bioreactors into a 15 centimeter Petri dish, which prevents the evaporation of water and contamination. Put the Petri dish with mini bioreactors on a orbital shaker. Cultivate the organoids at rotation rate 70, 75rpm.On day 16, prepare medium C.Transfer organoid into 50 milliliter tube. For 5 minutes, let them fall to the bottom. Aspirate the supernatant and add 5 milliliters of the medium C.Rejoin the organoids in the mini bioreactors.Cultivate spheroids in medium C for 2 weeks, refreshing the medium every 2 days. During these 2 weeks, select about 100 spheroids per mini bioreactors for the following cultivation. On day 30, prepare medium D.Change cultivation medium to medium D, which is a maturation medium.Refresh cultivation medium every 2 or 3 days for 3 weeks. Then use the medium D dissolved in F and GDNF. After 1 month of consecutive cultivation in medium A and B, organoids standardized in size and morphology are obtained.As it grows, they need to change the medium more often, up to 4 times a week also increases. After 2 months of cultivation, they reach 4 and 5 millimeter in diameter. And after another month, 5 and 6 millimeter and the growth stops.The figure shows the appearance of organoid enzyme, clear sections painted with hematoxylin and eosin. Immunohistochemical analysis for 1 month shows the presence of SOX2 positive clusters of progenitor cells, including inside central part. In the peripheral of the organoids, glial fibrillary acidic protein, microtubule-associated protein 2, and thiazine hydrolase positive.Cells are concentrated, which corresponds to mature form of neurons. In some cases, clusters of whites on necrotic area are formed in the central part. This indicates the limitation of this protocol for obtaining larger organoids.Most likely, the limiting factor of growth is the rate of diffusion of nutrient and oxygen. The various media and cell type of spheroids and testing our system for some kinds of organoids. Lots of brain and retina, combined organoids from liver carcinoma cells and mesenchymal stem cells, combined organoids from capital blast mesenchymal stem calls and the hematopoietic stem cells differentiation from induced pluripotent stem cells and intestine organoids.Was it variable in the initial composition of cells? Differentiation factors, culture, and medium, extracellular matrix, and possibly also the gas mixture composition, the rate of the platform rotation, and other parameters. It will be possible to obtain organoid with the same shape, size, or morphology model in various organs and tissues.The use of mini bioreactors proposed into this work.

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JoVE Journal

Developmental Biology

Generation of Induced Pluripotent Stem Cells from Frozen Buffy Coats using Non-integrating Episomal Plasmids

Somatic cells can be reprogrammed into induced pluripotent stem cells (iPSCs) by forcing the expression of four transcription factors (Oct-4, Sox-2, Klf-4, and c-Myc), typically expressed by human embryonic stem cells (hESCs). Due to their similarity with hESCs, iPSCs have become an important tool for potential patient-specific regenerative medicine, avoiding ethical issues associated with hESCs. In order to obtain cells suitable for clinical application, transgene-free iPSCs need to be generated to avoid transgene reactivation, altered gene expression and misguided differentiation. Moreover, a highly efficient and inexpensive reprogramming method is necessary to derive sufficient iPSCs for therapeutic purposes. Given this need, an efficient non-integrating episomal plasmid approach is the preferable choice for iPSC derivation. Currently the most common cell type used for reprogramming purposes are fibroblasts, the isolation of which requires tissue biopsy, an invasive surgical procedure for the patient. Therefore, human peripheral blood represents the most accessible and least invasive tissue for iPSC generation.
In this study, a cost-effective and viral-free protocol using non-integrating episomal plasmids is reported for the generation of iPSCs from human peripheral blood mononuclear cells (PBMNCs) obtained from frozen buffy coats after whole blood centrifugation and without density gradient separation.

Induced pluripotent stem cells (iPSCs) represent a source of patient-specific tissues for clinical applications and basic research. Here, we present a detailed protocol to reprogram human peripheral blood mononuclear cells (PBMNCs) obtained from frozen buffy coats into viral-free iPSCs using non-integrating episomal plasmids.

Somatic cells can be reprogrammed into induced pluripotent stem cells (iPSCs) by forcing the expression of four transcription factors (Oct-4, Sox-2, ...

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 ...

Generation of Induced Pluripotent Stem Cells from Human Peripheral T Cells Using Sendai Virus in Feeder-free Conditions

Recently, iPSCs have attracted attention as a new source of cells for regenerative therapies. Although the initial method for generating iPSCs relied on dermal fibroblasts obtained by invasive biopsy and retroviral genomic insertion of transgenes, there have been many efforts to avoid these disadvantages. Human peripheral T cells are a unique cell source for generating iPSCs. iPSCs derived from T cells contain rearrangements of the T cell receptor (TCR) genes and are a source of antigen-specific T cells. Additionally, T cell receptor rearrangement in the genome has the potential to label individual cell lines and distinguish between transplanted and donor cells. For safe clinical application of iPSCs, it is important to minimize the risk of exposing newly generated iPSCs to harmful agents. Although fetal bovine serum and feeder cells have been essential for pluripotent stem cell culture, it is preferable to remove them from the culture system to reduce the risk of unpredictable pathogenicity. To address this, we have established a protocol for generating iPSCs from human peripheral T cells using Sendai virus to reduce the risk of exposing iPSCs to undefined pathogens. Although handling Sendai virus requires equipment with the appropriate biosafety level, Sendai virus infects activated T cells without genome insertion, yet with high efficiency. In this protocol, we demonstrate the generation of iPSCs from human peripheral T cells in feeder-free conditions using a combination of activated T cell culture and Sendai virus.

This protocol describes how to generate induced pluripotent stem cells (iPSCs) from human peripheral T cells in feeder-free conditions using a combination of matrigel and Sendai virus vectors containing reprogramming factors.

Recently, iPSCs have attracted attention as a new source of cells for regenerative therapies. Although the initial method for generating iPSCs relied on ...

Generation of Induced-pluripotent Stem Cells Using Fibroblast-like Synoviocytes Isolated from Joints of Rheumatoid Arthritis Patients

Mature somatic cells can be reversed into a pluripotent stem cell-like state using a defined set of reprogramming factors. Numerous studies have generated induced-Pluripotent Stem Cells (iPSCs) from various somatic cell types by transducing four Yamanaka transcription factors: Oct4, Sox2, Klf4 and c-Myc. The study of iPSCs remains at the cutting edge of biological and clinical research. In particular, patient-specific iPSCs can be used as a pioneering tool for the study of disease pathobiology, since iPSCs can be induced from the tissue of any individual. Rheumatoid arthritis (RA) is a chronic inflammatory disease, classified by the destruction of cartilage and bone structure in the joint. Synovial hyperplasia is one of the major reasons or symptoms that lead to these results in RA. Fibroblast-like Synoviocytes (FLSs) are the main component cells in the hyperplastic synovium. FLSs in the joint limitlessly proliferate, eventually invading the adjacent cartilage and bone. Currently, the hyperplastic synovium can be removed only by a surgical procedure. The removed synovium is used for RA research as a material that reflects the inflammatory condition of the joint. As a major player in the pathogenesis of RA, FLSs can be used as a material to generate and investigate the iPSCs of RA patients. In this study, we used the FLSs of a RA patient to generate iPSCs. Using a lentiviral system, we discovered that FLSs can generate RA patient-specific iPSC. The iPSCs generated from FLSs can be further used as a tool to study the pathophysiology of RA in the future.

Here we describe a protocol for generating human induced-pluripotent stem cells from patient-derived fibroblast-like synoviocytes, using a lentiviral system without feeder cells.

Mature somatic cells can be reversed into a pluripotent stem cell-like state using a defined set of reprogramming factors. Numerous studies have generated ...

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 ...

Induced Pluripotent Stem Cell Generation from Blood Cells Using Sendai Virus and Centrifugation

The recent development of human induced pluripotent stem cells (hiPSCs) proved that mature somatic cells can return to an undifferentiated, pluripotent state. Now, reprogramming is done with various types of adult somatic cells: keratinocytes, urine cells, fibroblasts, etc. Early experiments were usually done with dermal fibroblasts. However, this required an invasive surgical procedure to obtain fibroblasts from the patients. Therefore, suspension cells, such as blood and urine cells, were considered ideal for reprogramming because of the convenience of obtaining the primary cells. Here, we report an efficient protocol for iPSC generation from peripheral blood mononuclear cells (PBMCs). By plating the transduced PBMCs serially to a new, matrix-coated plate using centrifugation, this protocol can easily provide iPSC colonies. This method is also applicable to umbilical cord blood mononuclear cells (CBMCs). This study presents a simple and efficient protocol for the reprogramming of PBMCs and CBMCs.

We propose a protocol for reprogramming peripheral blood mononuclear cells (PBMCs) into induced pluripotent stem cells (iPSCs). By plating the transduced blood cells onto matrix-coated plates with centrifugation, iPSCs are successfully induced from floating cells. This technique suggests a simple and effective reprogramming protocol for cells such as PBMCs and CBMCs.

The recent development of human induced pluripotent stem cells (hiPSCs) proved that mature somatic cells can return to an undifferentiated, pluripotent ...

Generation of Integration-free Induced Pluripotent Stem Cells from Human Peripheral Blood Mononuclear Cells Using Episomal Vectors

Induced Pluripotent Stem Cells (iPSCs) hold great promise for disease modeling and regenerative therapies. We previously reported the use of Episomal Vectors (EV) to generate integration-free iPSCs from peripheral blood mononuclear cells (PB MNCs). The episomal vectors used are DNA plasmids incorporated with oriP and EBNA1 elements from the Epstein-Barr (EB) virus, which&#160;allow for replication and long-term retainment of plasmids in mammalian cells, respectively. With further optimization, thousands of iPSC colonies can be obtained from 1 mL of peripheral blood. Two critical factors for achieving high reprogramming efficiencies&#160;are: 1) the use of a 2A &#34;self-cleavage&#34; peptide to link OCT4 and SOX2, thus achieving equimolar expression of the two factors; 2) the use of two vectors to express MYC and KLF4 individually. Here we describe a step-by-step protocol for generating integration-free iPSCs from adult peripheral blood samples. The generated iPSCs are integration-free as residual episomal plasmids are undetectable after five passages. Although the reprogramming efficiency is comparable to that of Sendai Virus (SV) vectors, EV plasmids are considerably more economical than the commercially available SV vectors. This affordable EV reprogramming system holds potential for clinical applications in regenerative medicine and provides an approach for the direct reprogramming of PB MNCs to integration-free mesenchymal stem cells, neural stem cells, etc.

This protocol describes a detailed method for efficient generation of integration-free iPSCs from human adult peripheral blood cells. With the use of four oriP/EBNA-based episomal vectors to express the reprogramming factors, KLF4, MYC, BCL-XL, or OCT4 and SOX2, thousands of iPSC colonies can be obtained from 1 mL of peripheral blood.

Induced Pluripotent Stem Cells (iPSCs) hold great promise for disease modeling and regenerative therapies. We previously reported the use of Episomal ...

Defined and Scalable Generation of Hepatocyte-like Cells from Human Pluripotent Stem Cells

Human pluripotent stem cells (hPSCs) possess great value for biomedical research. hPSCs can be scaled and differentiated to all cell types found in the human body. The differentiation of hPSCs to human hepatocyte-like cells (HLCs) has been extensively studied, and efficient differentiation protocols have been established. The combination of extracellular matrix and biological stimuli, including growth factors, cytokines, and small molecules, have made it possible to generate HLCs that resemble primary human hepatocytes. However, the majority of procedures still employ undefined components, giving rise to batch-to-batch variation. This serves as a significant barrier to the application of the technology. To tackle this issue, we developed a defined system for hepatocyte differentiation using human recombinant laminins as extracellular matrices in combination with a serum-free differentiation process. Highly efficient hepatocyte specification was achieved, with demonstrated improvements in both HLC function and phenotype. Importantly, this system is easy to scale up using research and GMP-grade hPSC lines&#160;promising advances in cell-based modelling and therapies.

The method presented here describes a scalable and good manufacturing practice (GMP)-ready differentiation system to generate human hepatocyte-like cells from pluripotent stem cells. It serves as a cost-effective and standardized system to generate human hepatocyte-like cells for basic and applied human liver research.

Human pluripotent stem cells (hPSCs) possess great value for biomedical research. hPSCs can be scaled and differentiated to all cell types found in the ...

Generation of Standardized and Reproducible Forebrain-type Cerebral Organoids from Human Induced Pluripotent Stem Cells

The human cortex is highly expanded and exhibits a complex structure with specific functional areas, providing higher brain function, such as cognition. Efforts to study human cerebral cortex development have been limited by the availability of model systems. Translating results from rodent studies to the human system is restricted by species differences and studies on human primary tissues are hampered by a lack of tissue availability as well as ethical concerns. Recent development in human pluripotent stem cell (PSC) technology include the generation of three-dimensional (3D) self-organizing organotypic culture systems, which mimic to a certain extent human-specific brain development in vitro. Currently, various protocols are available for the generation of either whole brain or brain-region specific organoids. The method for the generation of homogeneous and reproducible forebrain-type organoids from induced PSC (iPSC), which we previously established and describe here, combines the intrinsic ability of PSC to self-organize with guided differentiation towards the anterior neuroectodermal lineage and matrix embedding to support the formation of a continuous neuroepithelium. More specifically, this protocol involves: (1) the generation of iPSC aggregates, including the conversion of iPSC colonies to a confluent monolayer culture; (2) the induction of anterior neuroectoderm; (3) the embedding of neuroectodermal aggregates in a matrix scaffold; (4) the generation of forebrain-type organoids from neuroectodermal aggregates; and (5) the fixation and validation of forebrain-type organoids. As such, this protocol provides an easily applicable system for the generation of standardized and reproducible iPSC-derived cortical tissue structures in vitro.

Cerebral organoids represent a new model system to investigate early human brain development in vitro. This article provides the detailed methodology to efficiently generate homogeneous dorsal forebrain-type organoids from human induced pluripotent stem cells including critical characterization and validation steps.

The human cortex is highly expanded and exhibits a complex structure with specific functional areas, providing higher brain function, such as cognition. ...

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 ...