Name: human pluripotent stem cell culture on polyvinyl alcohol-co-itaconic acid hydrogels with varying stiffness under xeno-free conditions
Uploaded: 2018-02-03T15:00:00
Description: Watch this Scientific Journal Video about Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions at JoVE.com

This research was partially supported by the Ministry of Science and Technology, Taiwan under grant numbers 106-2119-M-008 -003, 105-2119-M-008-006, and 104-2221-E-008-107-MY3. This research was also supported by the Taiwan Landseed Hospital Project (NCU-LSH-105-A-001). A Grant-in-Aid for Scientific Research (number 15K06591) from the Ministry of Education, Culture, Sports, Science and Technology of Japan is also acknowledged. A. Higuchi would like to acknowledge for the International Scientific Partnership Program (ISPP-0062) Vice Rectorate for Graduate Studies and Research, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia.

The experiments in this study were approved by the ethics committees of the Taiwan Landseed Hospital (IRB-13-05) and the National Central University. All experiments were conducted in accordance with all relevant and applicable governmental and institutional guidelines and regulations during this study.
1. Solution and Media Preparation
<ol>
	<li>Polymer purification
	<ol>
		<li>Purify P-IA with carboxylic acid group with a degree of hydrolysis of &#62;96.5% by washing P-IA ...

<ol>
	<li>Higuchi, A., Ling, Q. D., Chang, Y., Hsu, S. T., Umezawa, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Physical+cues+of+biomaterials+guide+stem+cell+differentiation+fate.">Physical cues of biomaterials guide stem cell differentiation fate.</a> Chem. Rev. 113, 3297-3328 (2013).</li><li>Higuchi, 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=Physical+cues+of+cell+culture+materials+lead+the+direction+of+differentiation+lineages+of+pluripotent+stem+cells.">Physical cues of cell culture materials lead the direction of differentiation lineages of pluripotent stem cells.</a> J. Mater. Chem. B. 3, 8032-8058 (2015).</li><li>Wen, J. 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S., 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=The+combined+influence+of+substrate+elasticity+and+surface-grafted+molecules+on+the+ex+vivo+expansion+of+hematopoietic+stem+and+progenitor+cells.">The combined influence of substrate elasticity and surface-grafted molecules on the ex vivo expansion of hematopoietic stem and progenitor cells.</a> Biomaterials. 34, 7632-7644 (2013).</li><li>Higuchi, A., Iijima, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=DSC+investigation+of+the+states+of+water+in+poly(vinyl+alcohol)+membranes.">DSC investigation of the states of water in poly(vinyl alcohol) membranes.</a> Polymer. 26, 1207-1211 (1985).</li><li>Higuchi, A., Iijima, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=DSC+investigation+of+the+states+of+water+in+poly(vinyl+alcohol-co-itaconic+acid)+membranes.">DSC investigation of the states of water in poly(vinyl alcohol-co-itaconic acid) membranes.</a> Polymer. 26, 1833-1837 (1985).</li><li>Higuchi, 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=Long-term+xeno-free+culture+of+human+pluripotent+stem+cells+on+hydrogels+with+optimal+elasticity.">Long-term xeno-free culture of human pluripotent stem cells on hydrogels with optimal elasticity.</a> Sci Rep. 5, 18136 (2015).</li><li>Wang, P. 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=Pluripotency+maintenance+of+amniotic+fluid-derived+stem+cells+cultured+on+biomaterials.">Pluripotency maintenance of amniotic fluid-derived stem cells cultured on biomaterials.</a> J Mater Chem B. 3, 3858-3869 (2015).</li><li>Muduli, S., 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=Proliferation+and+osteogenic+differentiation+of+amniotic+fluid-derived+stem+cells.">Proliferation and osteogenic differentiation of amniotic fluid-derived stem cells.</a> J Mater Chem B. 5, 5345-5354 (2017).</li><li>Muduli, S., 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=Stem+cell+culture+on+polyvinyl+alcohol+hydrogels+having+different+elasticity+and+immobilized+with+ECM-derived+oligopeptides.">Stem cell culture on polyvinyl alcohol hydrogels having different elasticity and immobilized with ECM-derived oligopeptides.</a> JPoly Eng. 37, 647 (2017).</li><li>Chen, Y. 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A., Chang, Y., Umezawa, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Biomaterials+for+the+feeder-free+culture+of+human+embryonic+stem+cells+and+induced+pluripotent+stem+cells.">Biomaterials for the feeder-free culture of human embryonic stem cells and induced pluripotent stem cells.</a> Chem Rev. 111 (5), 3021-3035 (2011).</li><li>Higuchi, 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=Design+of+polymeric+materials+for+culturing+human+pluripotent+stem+cells:+Progress+toward+feeder-free+and+xeno-free+culturing.">Design of polymeric materials for culturing human pluripotent stem cells: Progress toward feeder-free and xeno-free culturing.</a> Prog Polym Sci. 39, 1348-1374 (2014).</li><li>Higuchi, 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=Stem+cell+therapies+for+myocardial+infarction+in+clinical+trials:+bioengineering+and+biomaterial+aspects.">Stem cell therapies for myocardial infarction in clinical trials: bioengineering and biomaterial aspects.</a> Lab Invest. 97, 1167-1179 (2017).</li><li>Higuchi, 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=Stem+cell+therapies+for+reversing+vision+loss.">Stem cell therapies for reversing vision loss.</a> Trends Biotechnol. 35, 1102-1117 (2017).</li></ol>

P-IA-oligoECM and P-IA-ECM hydrogels with varying stiffness were developed for the long-term expansion of human ES and iPS cells maintaining their pluripotency for over ten passages in xeno-free conditions, as well as for the culture of human AFS cells, ADS cells, and hematopoietic stem cells25,28,32. P-IA hydrogels immobilized with oligoECM are an excellent candidate for cell cultivation materials to investigate the effect of c...

The fate of stem cell differentiation into a specific lineage of cells and the long-term proliferation of stem cells, especially human induced pluripotent (iPS) cells and human embryonic stem (ES) cells, is known to be regulated by inhibitors, growth factors, and/or small bioactive molecules in culture media. Recently, the physical cues of the biomaterials, particularly the stiffness of cell culture biomaterials, have been recognized to be an important factor guiding the fate of stem cell proliferation and differentiation1,2,3,4,5,6. Therefore, several researchers have started to investigate the fate of stem cells, which are cultured on hydrogels, on differentiation, mainly using polyacrylamide hydrogels with varying stiffness.
The stiffness of biomaterials can control focal adhesions, cell morphology, cell phenotype, and stem cell adhesion, especially in two-dimensional (2-D) cultivation1,2,3,5. Mechano-sensing of biomaterials by stem cells is generally controlled by focal adhesion signaling via integrin receptors. NMMIIA, nonmuscle myosin IIA-dependent contractility of the cytoskeleton of actin plays a critical role in the mechanosensing process of stem cells in 2-D cell cultivation systems3,4,5,7,8,9,10,11.
Engler and his colleagues developed an interesting notion that adult stem cells, such as bone marrow stem (BMS) cells cultivated on cell culture biomaterials with a similar stiffness to that of specific tissues, tend to differentiate into cells originated from specific tissues5. BMS cells incubated on 2-D soft polyacrylamide hydrogels coated with collagen type I (with a stiffness comparable to that of brain tissues) in expansion media were spontaneously induced to differentiate into early neuron lineages, whereas BMS cells cultured on hydrogels with a stiffness similar to that of muscle or collagenous bone tissues were found to induce differentiation into early lineages of myocytes and osteoblasts, respectively, on 2-D polyacrylamide hydrogels3,5. Many researchers have investigated the stem cell fate of differentiation cultured on polyacrylamide hydrogels immobilized with collagen type I12,13,14,15,16,17,18,19,20,21. However, it should be mentioned that some contradictory reports1,18,22,23,24 exist for the well-known idea suggested by Engler et al.5 This is because Engler&#39;s idea5 was developed solely on polyacrylamide hydrogels and their results have originated from specific characteristics of the biomaterial (polyacrylamide), and not solely from the physical cue (stiffness) of the biomaterial. Therefore, it is important to develop another type of hydrogel, of which the stiffness can be controlled by crosslinking of the hydrogels. For this purpose, bioinert hydrogels were developed, which were prepared from polyvinyl alcohol-co-itaconic acid (P-IA) with a different stiffness, which was controlled by the crosslinking degree with a changing crosslinking time25,26,27,28,29,30,31,32. The stem cells can be cultivated on nonmodified P-IA hydrogels, as well as P-IA hydrogels grafted with extracellular matrices (ECMs) and oligopeptides. In a previous study25, human hematopoietic stem cells (hHSCs) from umbilical cord blood were cultivated on P-IA hydrogels with different stiffness values ranging from a 3 kPa to 30 kPa storage modulus where fibronectin or an oligopeptide derived from fibronectin (CS1, EILDVPST) was grafted onto the P-IA hydrogels. High ex vivo fold expansion of hHSCs was observed in the P-IA hydrogels grafted with CS1 or fibronectin, which displayed an intermediate stiffness ranging from 12 kPa to 30 kPa25.
Human iPS and ES cells cannot be cultivated on conventional tissue culture polystyrene (TCP) dishes33,34 because human ES and iPS cells require specific binding to ECMs, such as vitronectin or laminin to maintain their pluripotency during long-term culture. Therefore, several structures of oligopeptide-grafted P-IA hydrogels with optimal stiffness characteristics were designed and prepared in formations of a single chain, a single chain with a joint segment, a dual chain with a joint segment, and a branched-type chain32. Oligopeptide sequences were selected from integrin- and glycosaminoglycan-binding domains of ECMs. The P-IA hydrogels grafted with vitronectin-derived oligopeptides with a dual chain or joint segment, which have a storage modulus at approximately 25 kPa, supported the long-term culture of human ES and iPS cells for over 12 passages under xeno-free and chemical defined conditions32. The joint segment and dual chain with cell adhesion molecules on the hydrogels facilitated the proliferation and pluripotency of human ES and iPS cells32. Here, a protocol for preparing P-IA hydrogels (with a storage modulus from 10 kPa to 30 kPa, which was measured under wet conditions in the air) grafted with and without oligopeptides or ECMs is described. How to culture and passage several stem cells (including amniotic fluid stem cells, adipose-derived stem cells, human ES cells, and human iPS cells) is shown.

<table>
	<tbody>
		<tr>
			<td>GTPGPQGIAGQRGVV</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: Cyclic RGD, cRGD</td>
		</tr>
		<tr>
			<td>GACRGDCLGA</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: FN1</td>
		</tr>
		<tr>
			<td>KGGAVTGRGDSPASS</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: CS1</td>
		</tr>
		<tr>
			<td>EILDVPST</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: VN1</td>
		</tr>
		<tr>
			<td>KGGPQVTRGDVFTMP</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: HBP1</td>
		</tr>
		<tr>
			<td>GKKQRFRHRNRKG</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: HBP2C</td>
		</tr>
		<tr>
			<td>CGGGKKQRFRHRNRKG</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: VN1G</td>
		</tr>
		<tr>
			<td>GGGGKGGPQVTRGDVFTMP</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Oligopeptide 
			Abbreviation: VN2C</td>
		</tr>
		<tr>
			<td>GCGGKGGPQVTRGDVFTMP</td>
			<td>PH Japan</td>
			<td>none</td>
			<td>Specification: Extracellular matrix 
			Abbreviation: rVN</td>
		</tr>
		<tr>
			<td>Vitronectin</td>
			<td>Thermo Fisher scientific</td>
			<td>A14700</td>
			<td>Specification: Extracellular matrix 
			Abbreviation: FN</td>
		</tr>
		<tr>
			<td>Fibronectin</td>
			<td>Sigma-Aldrich</td>
			<td>F2006</td>
			<td>Specification: Commercially available coating material 
			Abbreviation: Synthemax II</td>
		</tr>
		<tr>
			<td>Synthemax II</td>
			<td>Corning</td>
			<td>3535</td>
			<td>Specification: Polymer</td>
		</tr>
		<tr>
			<td>Polyvinylalcohol-co-itaconic acid</td>
			<td>Japan VAM &#38; Poval</td>
			<td>AF-17</td>
			<td>Specification: Chemical</td>
		</tr>
		<tr>
			<td>Glutaraldehyde</td>
			<td>Sigma-Aldrich</td>
			<td>G5882</td>
			<td>Specification: Chemical</td>
		</tr>
		<tr>
			<td>Na2SO4</td>
			<td>Sigma-Aldrich</td>
			<td>239313</td>
			<td>Specification: Chemical</td>
		</tr>
		<tr>
			<td>H2SO4</td>
			<td>Sigma-Aldrich</td>
			<td>339741</td>
			<td>Specification: Chemical 
			Abbreviation: EDC</td>
		</tr>
		<tr>
			<td>N-(3-Dimethylaminopropyl)-N&#39;-ethylcarbodiimide hydrochloride</td>
			<td>Sigma-Aldrich</td>
			<td>E7750</td>
			<td>Specification: Chemical 
			Abbreviation: NHS</td>
		</tr>
		<tr>
			<td>N-hydroxysuccinimide</td>
			<td>Sigma-Aldrich</td>
			<td>56480</td>
			<td>Specification: Chemical</td>
		</tr>
		<tr>
			<td>Paraformaldehyde</td>
			<td>Sigma-Aldrich</td>
			<td>P6148</td>
			<td>Specification: Chemical</td>
		</tr>
		<tr>
			<td>Triton-X100</td>
			<td>Sigma-Aldrich</td>
			<td>T8787</td>
			<td>Specification: Cell culture consumable</td>
		</tr>
		<tr>
			<td>Cell scraper</td>
			<td>Corning</td>
			<td>3008</td>
			<td>Specification: Cell culture consumable</td>
		</tr>
		<tr>
			<td>Dispase II</td>
			<td>Sigma-Aldrich</td>
			<td>SI-D4693</td>
			<td>Specification: Cell culture medium</td>
		</tr>
		<tr>
			<td>Essential 6</td>
			<td>Thermo Fisher scientific</td>
			<td>A1516401</td>
			<td>Specification: Cell culture medium</td>
		</tr>
		<tr>
			<td>Essential 8</td>
			<td>Thermo Fisher scientific</td>
			<td>A1517001</td>
			<td>Specification: Cell culture medium</td>
		</tr>
		<tr>
			<td>DMEM/F12</td>
			<td>Thermo Fisher scientific</td>
			<td>11330-032</td>
			<td>Specification: Cell culture medium</td>
		</tr>
		<tr>
			<td>DMEM</td>
			<td>Thermo Fisher scientific</td>
			<td>12800-017</td>
			<td>Specification: Cell culture medium</td>
		</tr>
		<tr>
			<td>MCDB 201</td>
			<td>Sigma-Aldrich</td>
			<td>M6770</td>
			<td>Specification: ES cell</td>
		</tr>
		<tr>
			<td>Human ES cell</td>
			<td>WiCell Research Institute, Inc..</td>
			<td>WA09</td>
			<td>Specification: iPS cell</td>
		</tr>
		<tr>
			<td>Human iPS cell</td>
			<td>Riken Cell Bank</td>
			<td>HS0077</td>
			<td>Specification: 35 mm 
			Abbreviation: TCP</td>
		</tr>
		<tr>
			<td>TCP dish</td>
			<td>Corning</td>
			<td>353001</td>
			<td>Specification: 60 mm 
			Abbreviation: TCP</td>
		</tr>
		<tr>
			<td>TCP dish</td>
			<td>Corning</td>
			<td>353002</td>
			<td>Specification: 24 well dish</td>
		</tr>
		<tr>
			<td>24 well dish</td>
			<td>Corning</td>
			<td>353047</td>
			<td>Specification: Blocking agent</td>
		</tr>
		<tr>
			<td>Bovine serum albumin</td>
			<td>Sigma-Aldrich</td>
			<td>A8806</td>
			<td>Specification: Detection reagent</td>
		</tr>
		<tr>
			<td>Alkaline phosphatase live stain</td>
			<td>Thermo Fisher scientific</td>
			<td>A14353</td>
			<td>Specification: Detection reagent</td>
		</tr>
		<tr>
			<td>Hematoxylin &#38; eosin</td>
			<td>Sigma-Aldrich</td>
			<td>1.05175</td>
			<td>Specification: EB formation dish</td>
		</tr>
		<tr>
			<td>6-well ultralow attachment dish</td>
			<td>Corning</td>
			<td>3471</td>
			<td>Specification: Coating material</td>
		</tr>
		<tr>
			<td>gelatin</td>
			<td>Sigma-Aldrich</td>
			<td>G9391</td>
			<td>Specification: Coating material</td>
		</tr>
		<tr>
			<td>Matrigel</td>
			<td>Corning</td>
			<td>354230</td>
			<td>Specification: Mice</td>
		</tr>
		<tr>
			<td>NOD-SCID mice</td>
			<td>National Applied Research Laboratories</td>
			<td>None</td>
			<td>Specification: Serum</td>
		</tr>
		<tr>
			<td>Fetal bovine serum</td>
			<td>Biological Industries</td>
			<td>04-001-1A</td>
			<td>Specification: Antibiotic</td>
		</tr>
		<tr>
			<td>antimycotic antibiotic</td>
			<td>Thermo Fisher scientific</td>
			<td>15240-062</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Antibody for Nanog</td>
			<td>Invitrogen</td>
			<td>MA1-017</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Antibody for SSEA4</td>
			<td>Abcam</td>
			<td>ab16287</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Antibody for OCT3/4</td>
			<td>Invitrogen</td>
			<td>PA5-27438</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Antibody for Sox2</td>
			<td>Invitrogen</td>
			<td>48-1400</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Antibody for Smooth Muscle Actin</td>
			<td>Invitrogen</td>
			<td>PA5-19465</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Antibody for AFP</td>
			<td>Invitrogen</td>
			<td>PA5-21004</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Antibody GFAP</td>
			<td>Invitrogen</td>
			<td>MA5-15086</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Alexa Fluor 555 &#8211; conjugated Goat anti-Mouse antibody</td>
			<td>Invitrogen</td>
			<td>A-21422</td>
			<td>Specification: Antibody</td>
		</tr>
		<tr>
			<td>Alexa Fluor 488 &#8211; conjugated Goat anti-Rabbit antibody</td>
			<td>Invitrogen</td>
			<td>A-11008</td>
			<td>Specification: Antibody</td>
		</tr>
	</tbody>
</table>

human pluripotent stem cell culture on polyvinyl alcohol-co-itaconic acid hydrogels with varying stiffness under xeno-free conditions

The effect of physical cues, such as the stiffness of biomaterials on the proliferation and differentiation of stem cells, has been investigated by several researchers. However, most of these investigators have used polyacrylamide hydrogels for stem cell culture in their studies. Therefore, their results are controversial because those results might originate from the specific characteristics of the polyacrylamide and not from the physical cue (stiffness) of the biomaterials. Here, we describe a protocol for preparing hydrogels, which are not based on polyacrylamide, where various stem, cells including human embryonic stem (ES) cells and human induced pluripotent stem (iPS) cells, can be cultured. Hydrogels with varying stiffness were prepared from bioinert polyvinyl alcohol-co-itaconic acid (P-IA), with stiffness controlled by crosslinking degree by changing crosslinking time. The P-IA hydrogels grafted with and without oligopeptides derived from extracellular matrix were investigated as a future platform for stem cell culture and differentiation. The culture and passage of amniotic fluid stem cells, adipose-derived stem cells, human ES cells, and human iPS cells is described in detail here. The oligopeptide P-IA hydrogels showed superior performances, which were induced by their stiffness properties. This protocol reports the synthesis of the biomaterial, their surface manipulation, along with controlling the stiffness properties and finally, their impact on stem cell fate using xeno-free culture conditions. Based on recent studies, such modified substrates can act as future platforms to support and direct the fate of various stem cells line to different linkages; and further, regenerate and restore the functions of the lost organ or tissue.

P-IA hydrogels grafted with ECM-derived oligopeptide (oligoECM) or ECM with different elasticities were prepared by following the reaction scheme, as seen in Figure 1A, using different types of oligoECM (Figure 1B). The elasticities of the hydrogels were regulated by the applied crosslinking intensity (time) (Figure 1C). P-IA hydrogels grafted with vitronectin-derived oligopeptides, which has a stora...

Watch this Scientific Journal Video about Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions at JoVE.com

Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions

A protocol is presented to prepare polyvinyl alcohol-co-itaconic acid hydrogels with varying stiffness, which were grafted with and without oligopeptides, to investigate the effect of the stiffness of biomaterials on the differentiation and proliferation of stem cells. The stiffness of the hydrogels was controlled by the crosslinking time.

The effect of physical cues, such as the stiffness of biomaterials on the proliferation and differentiation of stem cells, has been investigated by ...

Research

JoVE Journal

Bioengineering

Development, Expansion, and In vivo Monitoring of Human NK Cells from Human Embryonic Stem Cells (hESCs) and Induced Pluripotent Stem Cells (iPSCs)

Development, Expansion, and In vivo Monitoring of Human NK Cells from Human Embryonic Stem Cells hESCs and Induced Pluripotent Stem Cells iPSCs

We present a method for deriving natural killer (NK) cells from undifferentiated hESCs and iPSCs using a feeder-free approach. This method gives rise to ...

Light-mediated Formation and Patterning of Hydrogels for Cell Culture Applications

Click chemistries have been investigated for use in numerous biomaterials applications, including drug delivery, tissue engineering, and cell culture. In ...

Tunable Hydrogels from Pulmonary Extracellular Matrix for 3D Cell Culture

Here we present a method for establishing multiple component cell culture hydrogels for in vitro lung cell culture. Beginning with healthy en bloc lung ...

Hyaluronic-Acid Based Hydrogels for 3-Dimensional Culture of Patient-Derived Glioblastoma Cells

Glioblastoma (GBM) is the most common, yet most lethal, central nervous system cancer. In recent years, many studies have focused on how the extracellular ...

Guided Differentiation of Mature Kidney Podocytes from Human Induced Pluripotent Stem Cells Under Chemically Defined Conditions

Kidney disease affects more than 10% of the global population and costs billions of dollars in federal expenditures. The most severe forms of kidney ...

Controlled Strain of 3D Hydrogels under Live Microscopy Imaging

External forces are an important factor in tissue formation, development, and maintenance. The effects of these forces are often studied using specialized ...

Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes

Conventional intracellular microelectrode techniques to quantify cardiomyocyte electrophysiology are extremely complex, labor intensive, and typically ...

A Culture Method to Maintain Quiescent Human Hematopoietic Stem Cells

Human hematopoietic stem cells (HSCs), like other mammalian HSCs, maintain lifelong hematopoiesis in the bone marrow. HSCs remain quiescent in vivo, ...