The authors wish to thank Harene Ranjithakumaran and Stacey Jackson for technical support. This work was supported in part by grants from the National Health and Medical Research Council (R.C.B. Wong, A. P&#233;bay), the University of Melbourne (R.C.B. Wong), Retina Australia (R.C.B. Wong, S.S.C. Hung, A. P&#233;bay) and the Ophthalmic Research Institute of Australia (R.C.B. Wong, S.S.C. Hung, A. P&#233;bay); Australian Research Council Future Fellowship (A. P&#233;bay, FT140100047), Cranbourne Foundation Fellowship (R.C.B. Wong); intramural funding from the National Institutes for Health (R.C.B. Wong, S.S.C. Hung) and operational infrastructure support from the Victorian Government.

The collection of human hair sample from individuals requires ethical approval by the human research ethics committee in the host institutions and should be done in compliance with the institutional guidelines.
1. Isolation of Keratinocytes from Plucked Hair
<ol>
	<li>Thaw Extracellular Matrix (ECM) solution (i.e., Matrigel) on ice O/N.</li>
	<li>Using pre-chilled pipette tips, add 200 &#181;l&#160;ECM solution to 12 ml&#160;of chilled DMEM/F12 medium. Coat a 12-well plate with 1 ml...

<ol>
	<li>Takahashi, K., Yamanaka, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Induction+of+pluripotent+stem+cells+from+mouse+embryonic+and+adult+fibroblast+cultures+by+defined+factors.">Induction of pluripotent stem cells from mouse embryonic and adult fibroblast cultures by defined factors.</a> Cell. 126, 663-676 (2006).</li><li>Takahashi, 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=Induction+of+pluripotent+stem+cells+from+adult+human+fibroblasts+by+defined+factors.">Induction of pluripotent stem cells from adult human fibroblasts by defined factors.</a> Cell. 131, 861-872 (2007).</li><li>Yu, 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=Induced+pluripotent+stem+cell+lines+derived+from+human+somatic+cells.">Induced pluripotent stem cell lines derived from human somatic cells.</a> Science. 318, 1917-1920 (2007).</li><li>Okita, 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=A+more+efficient+method+to+generate+integration-free+human+iPS+cells.">A more efficient method to generate integration-free human iPS cells.</a> Nat Methods. 8, 409-412 (2011).</li><li>Park, I. 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=Reprogramming+of+human+somatic+cells+to+pluripotency+with+defined+factors.">Reprogramming of human somatic cells to pluripotency with defined factors.</a> Nature. 451, U141-U141 (2008).</li><li>Okita, 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=An+efficient+nonviral+method+to+generate+integration-free+human-induced+pluripotent+stem+cells+from+cord+blood+and+peripheral+blood+cells.">An efficient nonviral method to generate integration-free human-induced pluripotent stem cells from cord blood and peripheral blood cells.</a> Stem Cells. 31, 458-466 (2013).</li><li>Dowey, S. N., Huang, X., Chou, B. K., Ye, Z., Cheng, L. <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+integration-free+human+induced+pluripotent+stem+cells+from+postnatal+blood+mononuclear+cells+by+plasmid+vector+expression.">Generation of integration-free human induced pluripotent stem cells from postnatal blood mononuclear cells by plasmid vector expression.</a> Nat Protoc. 7, 2013-2021 (2012).</li><li>Zhou, 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=Generation+of+induced+pluripotent+stem+cells+from+urine.">Generation of induced pluripotent stem cells from urine.</a> J Am Soc Nephrol. 22, 1221-1228 (2011).</li><li>Aasen, 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=Efficient+and+rapid+generation+of+induced+pluripotent+stem+cells+from+human+keratinocytes.">Efficient and rapid generation of induced pluripotent stem cells from human keratinocytes.</a> Nat Biotechnol. 26, 1276-1284 (2008).</li><li>Peters, A., Zambidis, E., Ye, K., Jin, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chapter+16.+Generation+of+nonviral+integration-free+induced+pluripotent+stem+cells+from+plucked+human+hair+follicles.">Chapter 16. Generation of nonviral integration-free induced pluripotent stem cells from plucked human hair follicles.</a> Human Embryonic and Induced Pluripotent Stem Cells: Lineage-Specific Differentiation Protocols.Springer Protocols Handbooks. , 203-227 (2012).</li><li>Fuchs, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Scratching+the+surface+of+skin+development.">Scratching the surface of skin development.</a> Nature. 445, 834-842 (2007).</li><li>Limat, A., Noser, F. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Serial+cultivation+of+single+keratinocytes+from+the+outer+root+sheath+of+human+scalp+hair+follicles.">Serial cultivation of single keratinocytes from the outer root sheath of human scalp hair follicles.</a> J Invest Dermatol. 87, 485-488 (1986).</li><li>Piao, Y., Hung, S. S., Lim, S. Y., Wong, R. C., Ko, M. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+generation+of+integration-free+human+induced+pluripotent+stem+cells+from+keratinocytes+by+simple+transfection+of+episomal+vectors.">Efficient generation of integration-free human induced pluripotent stem cells from keratinocytes by simple transfection of episomal vectors.</a> Stem Cells Transl Med. 3, 787-791 (2014).</li><li>Higgins, 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=Reprogramming+of+human+hair+follicle+dermal+papilla+cells+into+induced+pluripotent+stem+cells.">Reprogramming of human hair follicle dermal papilla cells into induced pluripotent stem cells.</a> J Invest Dermatol. 132, 1725-1727 (2012).</li><li>Muchkaeva, I. 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A., et al., Ausubel, F. 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=Mouse+embryo+fibroblast+(MEF)+feeder+cell+preparation.">Mouse embryo fibroblast (MEF) feeder cell preparation.</a> Current protocols in molecular biology. 23, Unit 23 22 (2001).</li><li>Pebay, 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=Essential+roles+of+sphingosine-1-phosphate+and+platelet-derived+growth+factor+in+the+maintenance+of+human+embryonic+stem+cells.">Essential roles of sphingosine-1-phosphate and platelet-derived growth factor in the maintenance of human embryonic stem cells.</a> Stem Cells. 23, 1541-1548 (2005).</li><li>Myung, P., Ito, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dissecting+the+bulge+in+hair+regeneration.">Dissecting the bulge in hair regeneration.</a> J Clin Invest. 122, 448-454 (2012).</li><li>Alonso, L., Fuchs, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+hair+cycle.">The hair cycle.</a> J Cell Sci. 119, 391-393 (2006).</li><li>Robinton, D. A., Daley, G. Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+promise+of+induced+pluripotent+stem+cells+in+research+and+therapy.">The promise of induced pluripotent stem cells in research and therapy.</a> Nature. 481, 295-305 (2012).</li><li>Soares, F. A., Sheldon, M., Rao, M., Mummery, C., Vallier, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=International+coordination+of+large-scale+human+induced+pluripotent+stem+cell+initiatives:+Wellcome+Trust+and+ISSCR+workshops+white+paper.">International coordination of large-scale human induced pluripotent stem cell initiatives: Wellcome Trust and ISSCR workshops white paper.</a> Stem cell reports. 3, 931-939 (2014).</li><li>McKernan, R., Watt, F. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=What+is+the+point+of+large-scale+collections+of+human+induced+pluripotent+stem+cells.">What is the point of large-scale collections of human induced pluripotent stem cells.</a> Nat Biotechnol. 31, 875-877 (2013).</li><li>Utikal, 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=Immortalization+eliminates+a+roadblock+during+cellular+reprogramming+into+iPS+cells.">Immortalization eliminates a roadblock during cellular reprogramming into iPS cells.</a> Nature. 460, U1145-U1112 (2009).</li><li>Xu, 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=Proliferation+rate+of+somatic+cells+affects+reprogramming+efficiency.">Proliferation rate of somatic cells affects reprogramming efficiency.</a> J Biol Chem. 288, 9767-9778 (2013).</li><li>Liu, 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=Late+passage+human+fibroblasts+induced+to+pluripotency+are+capable+of+directed+neuronal+differentiation.">Late passage human fibroblasts induced to pluripotency are capable of directed neuronal differentiation.</a> Cell Transplant. 20, 193-203 (2011).</li><li>Huallachain, M., Karczewski, K. 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Generation of patient-specific hiPSCs offers a unique approach for studying pathogenesis in the diseased cell types in vitro, and also provides a platform for drug screening to identify novel molecules that can rescue the disease phenotypes. This disease modeling approach using hiPSCs has yielded promising results for a variety of diseases, including Long QT syndrome, Huntington&#8217;s disease, Parkinson&#8217;s disease and amyotrophic lateral sclerosis 22. Several initiatives are already underway to...

The discovery of human induced pluripotent stem cells (hiPSCs) has revolutionized the field of regenerative medicine, providing a feasible method for generation of patient-specific stem cells 1-3. hiPSCs have been successfully generated from various somatic cell types, including fibroblasts 4,5, hematopoietic cells 6,7, renal epithelial cells from urine 8 and keratinocytes 9,10. To date, skin fibroblasts and hematopoietic cells represent the most commonly used cell sources for generating patient-specific iPSCs. Arguably, this is due to the fact that skin biopsies and blood collection are routine medical procedures and large biobanks of patient blood or skin samples have been established in many countries.
In contrast to blood cells and skin fibroblast which require invasive extraction methods, keratinocytes represent an easily accessible cell type for hiPSC generation. Keratinocytes are keratin-rich epithelial cells that form the exterior epidermal barrier of the skin and are also found in nails and hair 11. In particular, keratinocytes can be found on the outer root sheath (ORS) of hair follicles, an external cellular layer that covered the hair shaft together with the inner root sheath (IRS) cells (12, Figure 1). As hair collection is a simple procedure that does not require the assistance of medical personnel, it provides an opportunity for patients to collect and send their own hair samples to laboratories, which would greatly facilitate the collection of patient samples for hiPSC generation. Epidermal keratinocytes also have a higher reprogramming efficiency and faster reprogramming kinetics compared to fibroblasts, adding to the advantages of using keratinocytes as the starting cells for hiPSC generation 9,13. Furthermore, hiPSCs can also be generated using other cell populations within the hair follicle, including the dermal papilla cells located at the base of the hair follicle 14,15.
Previous reports of iPSC generation using hair-derived cells often utilize retroviral or lentiviral-based reprogramming methods 9,14,15. However, these viral methods introduce undesirable genomic integration of foreign transgenes during reprogramming. In comparison, the use of episomal vectors represents a feasible, non-viral reprogramming method to generate integration-free iPSCs 4. We have previously developed a simple, cost-effective and non-viral method to efficiently reprogram keratinocyte into hiPSCs using episomal vectors 13. Here we provide a detailed protocol for the generation of keratinocyte-derived hiPSCs, including the derivation of keratinocytes from plucked hair, expansion and maintenance of the keratinocytes and subsequent reprogramming to generate hiPSCs.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>Antibiotic Mix:&#160;</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>250 ng/ml Antimycotic amphotericin B</td>
			<td>Sigma</td>
			<td>A2942-20ml</td>
			<td>Antibiotic mix is made up in PBS.&#160;</td>
		</tr>
		<tr>
			<td>1X Penicillin/Streptomycin</td>
			<td>Invitrogen</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr>
			<td>PBS (-)</td>
			<td>Invitrogen</td>
			<td>14190-144</td>
			<td></td>
		</tr>
		<tr>
			<td>Knockout Serum Replacement (KSR) medium:&#160;</td>
			<td></td>
			<td></td>
			<td>KSR medium is filtered using Stericup (Millipore, #SCGPU05RE) before use. bFGF is added fresh to the media before use.</td>
		</tr>
		<tr>
			<td>20% knockout serum replacement (KSR)</td>
			<td>Invitrogen</td>
			<td>10828-028</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM/F12 with glutamax</td>
			<td>Invitrogen</td>
			<td>10565-042</td>
			<td></td>
		</tr>
		<tr>
			<td>1&#215; MEM non-essential amino acid</td>
			<td>Invitrogen</td>
			<td>11140-050</td>
			<td></td>
		</tr>
		<tr>
			<td>&#160;0.5&#215; Penicillin/Streptomycin</td>
			<td>Invitrogen</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr>
			<td>&#160;0.1 mM &#946;-mercaptoethanol</td>
			<td>Invitrogen</td>
			<td>21985</td>
			<td></td>
		</tr>
		<tr>
			<td>&#160;bFGF (10 ng/ml, added fresh)</td>
			<td>Millipore</td>
			<td>GF003</td>
			<td></td>
		</tr>
		<tr>
			<td>Keratinocyte medium:&#160;</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>&#160;EpiLife with 60&#160;&#181;M Calcium</td>
			<td>Invitrogen</td>
			<td>M-EPI-500-CA</td>
			<td></td>
		</tr>
		<tr>
			<td>1&#215; Human keratinocyte growth supplement (HKGS)</td>
			<td>Invitrogen</td>
			<td>S-001-5</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum (FBS) medium:&#160;</td>
			<td></td>
			<td></td>
			<td>FBS medium is filtered using Stericup (Millipore, #SCGPU05RE)&#160; before use.</td>
		</tr>
		<tr>
			<td>10% fetal bovine serum (FBS)</td>
			<td>Invitrogen</td>
			<td>26140079</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM&#160;</td>
			<td>Invitrogen</td>
			<td>11995-073</td>
			<td></td>
		</tr>
		<tr>
			<td>0.5&#215; Penicillin/Streptomycin</td>
			<td>Invitrogen</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr>
			<td>2 mM L-glutamine</td>
			<td>Invitrogen</td>
			<td>25030</td>
			<td></td>
		</tr>
		<tr>
			<td>0.25% trypsin-EDTA</td>
			<td>Invitrogen</td>
			<td>25200-056</td>
			<td></td>
		</tr>
		<tr>
			<td>Extracellular Matrix (ECM):</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Matrigel</td>
			<td>Corning&#160;</td>
			<td>354234</td>
			<td>Aliquot Matrigel stock and store in -80&#176;C following manufacturer&#8217;s instructions. Stock concentration of Matrigel varies slightly from batch to batch (~9mg/ml). We recommend to use 200&#181;l matrigel for coating a 12-well plate (~150&#181;g/well).&#160;</td>
		</tr>
		<tr>
			<td>Coating Matrix Kit&#160;</td>
			<td>Invitrogen</td>
			<td>R-011-K</td>
			<td></td>
		</tr>
		<tr>
			<td>Plasmids:&#160;</td>
			<td></td>
			<td></td>
			<td rowspan="5">Note that pCXLE-eGFP is only used for monitoring transfection efficiency and is not required for reprogramming.</td>
		</tr>
		<tr>
			<td>-&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; pCXLE-eGFP</td>
			<td>Addgene</td>
			<td>27082</td>
		</tr>
		<tr>
			<td>-&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; pCXLE-hOct3/4-shP53F</td>
			<td>Addgene</td>
			<td>27077</td>
		</tr>
		<tr>
			<td>-&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; pCXLE-hSK</td>
			<td>Addgene</td>
			<td>27078</td>
		</tr>
		<tr>
			<td>-&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; pCXLE-hUL</td>
			<td>Addgene</td>
			<td>27080</td>
		</tr>
		<tr>
			<td>Transfection reagent Fugene HD</td>
			<td>Promega</td>
			<td>E231B</td>
			<td></td>
		</tr>
		<tr>
			<td>Gelatin (from porcine skin)</td>
			<td>Sigma</td>
			<td>G1890</td>
			<td>Make up 0.1% gelatin in distilled water. Autoclave before use.&#160;</td>
		</tr>
		<tr>
			<td>Reduced Serum medium: OPTI-MEM</td>
			<td>Invitrogen</td>
			<td>31985062</td>
			<td></td>
		</tr>
		<tr>
			<td>Accutase</td>
			<td>Sigma</td>
			<td>A6964-100ml</td>
			<td></td>
		</tr>
		<tr>
			<td>Mouse embryonic fibroblast (MEF) feeder</td>
			<td></td>
			<td></td>
			<td>MEF can be inactivated by mitomycin C treatment or irradiation as described previously 16.</td>
		</tr>
		<tr>
			<td>26G needle</td>
			<td>Terumo</td>
			<td>NN2613R</td>
			<td></td>
		</tr>
		<tr>
			<td>6-well plate (tissue culture treated)</td>
			<td>BD Biosciences</td>
			<td>353046</td>
			<td></td>
		</tr>
		<tr>
			<td>12-well plate (tissue culture treated)</td>
			<td>BD Biosciences</td>
			<td>353043</td>
			<td></td>
		</tr>
		<tr>
			<td>10 cm dish (tissue culture treated)</td>
			<td>BD Biosciences</td>
			<td>353003</td>
			<td></td>
		</tr>
		<tr>
			<td>Dispase</td>
			<td>Invitrogen</td>
			<td>17105-041</td>
			<td>Use at 10mg/ml</td>
		</tr>
		<tr>
			<td>Collagenase IV</td>
			<td>Invitrogen</td>
			<td>17104-019</td>
			<td>Use at 1mg/ml</td>
		</tr>
		<tr>
			<td>TRA-160 antibody</td>
			<td>Millipore</td>
			<td>MAB4360</td>
			<td>Use at 5&#181;g/ml</td>
		</tr>
		<tr>
			<td>OCT4 antibody</td>
			<td>Santa Cruz</td>
			<td>SC-5279</td>
			<td>Use at 5&#181;g/ml</td>
		</tr>
		<tr>
			<td>NANOG antibody</td>
			<td>R&#38;D Systems</td>
			<td>AF1997</td>
			<td>Use at 10&#181;g/ml</td>
		</tr>
		<tr>
			<td>MycoAlert Detection kit</td>
			<td>Lonza</td>
			<td>LT07-418</td>
			<td></td>
		</tr>
	</tbody>
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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.

The hair goes through 3 different phases of growth cycle: anagen (the growth phase), catagen (the regression phase) and telogen (the rest phase) 20,21. The anagen hair follicle contains multiple layers of epithelium; these layers include the ORS, IRS and the hair shaft (Figure 1). Anagen hair eventually undergoes transition to the catagen phase, which is marked by apoptosis of the ORS and termination of hair shaft differentiation. Finally, catagen hair transition to the telogen phase, where ap...

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

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 ...

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Developmental Biology

11.3K ビュー.  University of Melbourne. 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. 

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

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 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 ...

Integration Free Derivation of Human Induced Pluripotent Stem Cells Using Laminin 521 Matrix

Xeno-free and fully defined conditions are key parameters for robust and reproducible generation of homogenous human induced pluripotent stem (hiPS) cells. Maintenance of hiPS cells on feeder cells or undefined matrices are susceptible to batch variances, pathogenic contamination and risk of immunogenicity. Utilizing the defined recombinant human laminin 521 (LN-521) matrix in combination with xeno-free and defined media formulations reduces variability and allows for the consistent generation of hiPS cells. The Sendai virus (SeV) vector is a non-integrating RNA-based system, thus circumventing concerns associated with the potential disruptive effect on genome integrity integrating vectors can have. Furthermore, these vectors have demonstrated relatively high efficiency in the reprogramming of dermal fibroblasts. In addition, enzymatic single cell passaging of cells facilitates homogeneous maintenance of hiPS cells without substantial prior experience of stem cell culture. Here we describe a protocol that has been extensively tested and developed with a focus on reproducibility and ease of use, providing a robust and practical way to generate defined and xeno-free human hiPS cells from fibroblasts.

Robust derivation of human induced pluripotent stem (hiPS) cells was achieved by using non-integrating Sendai virus (SeV) vector mediated reprogramming of dermal fibroblasts. hiPS cell maintenance and clonal expansion was performed using xeno-free and chemically defined culture conditions with recombinant human laminin 521 (LN-521) matrix and Essential E8 (E8) Medium.

Xeno-free and fully defined conditions are key parameters for robust and reproducible generation of homogenous human induced pluripotent stem (hiPS) ...

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. ...

Using Human Induced Pluripotent Stem Cell-derived Hepatocyte-like Cells for Drug Discovery

The ability to differentiate human induced pluripotent stem cells (iPSCs) into hepatocyte-like cells (HLCs) provides new opportunities to study inborn errors in hepatic metabolism. However, to provide a platform that supports the identification of small molecules that can potentially be used to treat liver disease, the procedure requires a culture format that is compatible with screening thousands of compounds. Here, we describe a protocol using completely defined culture conditions, which allow the reproducible differentiation of human iPSCs to hepatocyte-like cells in 96-well tissue culture plates. We also provide an example of using the platform to screen compounds for their ability to lower Apolipoprotein B (APOB) produced from iPSC-derived hepatocytes generated from a familial hypercholesterolemia patient. The availability of a platform that is compatible with drug discovery should allow researchers to identify novel therapeutics for diseases that affect the liver.

The protocol presented here describes a platform for identifying small molecules for the treatment of liver disease. A step-by-step description is presented detailing how to differentiate iPSCs into cells with hepatocyte characteristics in 96-well plates, and to use the cells to screen for small molecules with potential therapeutic activity.

The ability to differentiate human induced pluripotent stem cells (iPSCs) into hepatocyte-like cells (HLCs) provides new opportunities to study inborn ...