Generation of Induced Pluripotent Stem Cells from Muscular Dystrophy Patients: Efficient Integration-free Reprogramming of Urine Derived Cells

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Summary

This protocol entails detailed procedures for isolation of urine derived cells from muscular dystrophy patients; their efficient and rapid reprogramming through Sendai virus transduction.

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Afzal, M. Z., Strande, J. L. Generation of Induced Pluripotent Stem Cells from Muscular Dystrophy Patients: Efficient Integration-free Reprogramming of Urine Derived Cells. J. Vis. Exp. (95), e52032, doi:10.3791/52032 (2015).

Abstract

Dystrophic cardiomyopathy is a poorly understood consequence of muscular dystrophy. Generating induced Pluripotent Stem Cells (iPSCs) from patients with muscular dystrophy is an invaluable cellular source for in vitro disease model systems and can be used for drug screening studies. Patient-derived urine cells have been used in successful reprogramming into induced pluripotent stem cells in order to model dystrophic cardiomyopathy1. Addressing the safety concerns of integrating vector systems, we present a protocol using a non-integrating Sendai virus vector for transduction of Yamanaka factors into urine cells collected from patients with muscular dystrophy. This protocol generates fully reprogrammed clones within 2–3 weeks. The pluripotent cells are vector-free by passage-13. These dystrophic iPSCs can be differentiated into cardiomyocytes and used either to study disease mechanisms or for drug screening.

Introduction

Cardiomyopathy is the second leading cause of death in patients with Duchenne and Becker muscular dystrophy (MD). Although mutations in the X-linked dystrophin gene occur in 1:3,500 male births, very little is known about the molecular and cellular events leading to progressive cardiac muscle damage. Human induced pluripotent stem cells derived from muscular dystrophy patients have emerged as a novel tool to study the underlying disease mechanisms and to use for drug screening1,2.

The anticipated discomfort of skin biopsies or blood samples may dissuade young patients and/or their guardians to give consent for study participation. Urine samples are a non-invasive source of somatic cells that are amendable to reprogramming methods. We have recently shown that urine cells collected from muscular dystrophy patients may be cultured and efficiently reprogrammed into iPSCs using retroviral transduction with the Yamanaka factors (Oct3/4, Sox2, Klf4, and c-Myc; OSKM)1. The disadvantage of retroviral gene delivery is the random integration of the reprogramming genes into the host chromosomes. To overcome this limitation, we have used the non-integrating Sendai virus for urine cell reprogramming.

This protocol details the Sendai virus reprogramming of isolated urine cells from muscular dystrophy patients which can then be differentiated into cardiomyocytes or other cell types for further study. This protocol can also be adapted for other patient specific diseases.

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Protocol

NOTE: Patients and/or their guardians should give informed consent to participate in an Institutional Review Board approved study.

1. Buffers and Media Preparations

  1. Washing buffer: To prepare 100 ml of washing buffer, add 1 ml of 100x pen/strep Solution (100 U/ml penicillin + 100 µg/ml of Streptomycin) to 99 ml of phosphate buffer saline (PBS).
  2. Urinary Progenitor Cell (UPC) Medium: To prepare UPC medium, mix equal volumes of Keratinocyte Serum Free (KSF) Medium + Progenitor Cell Medium.
    1. KSF Medium: To prepare keratinocyte medium, add 5 ng/ml of epidermal growth factor (EGF), 50 ng/ml of bovine pituitary extract (BPE), 30 ng/ml of cholera toxin, and pen/strep solution (100 U/ml penicillin, 100 µg/ml streptomycin) to 500 ml KSF medium.
    2. Progenitor Cell Medium: Add three quarters of DMEM with one quarter of Ham-F12 media and supplement with 10% FBS, 0.4 µg/ml hydrocortisone, 0.1 nM cholera toxin, 5 ng/ml insulin, 1.8 x 10-4 M adenine, 5 µg/ml transferrin, 2 x 10-9 M triiodo thyronine, 10 ng/ml EGF, and pen/strep solution.
  3. hES Medium: Add 20% KO-serum replacement (K-SR), 1x MEM non-essential amino acids, 2 mM l-glutamine, 100 µM β-mercaptoethanol, 20 ng/ml bFGF and pen/strep to 400 ml DMEM/F12 medium.

2. Urine Sample Collection

  1. Instruct the patients to drink fluids 30 min prior to urine collection to ensure that an adequate amount (~30–40 ml) of urine can be collected.
  2. Give the patients and/or their guardians a urine collection kit containing the following items: (1) written instructions on how to obtain sterile or clean catch urine sample, (2) moist anti-bacterial toilettes, and (3) a 100 ml sterile specimen collection cup. Instruct patients to collect sample.
  3. Immediately place the urine samples on ice and transfer to the laboratory in a cooler. Process the urine for cell isolation immediately. If a delay is unavoidable, store the specimen on ice for up to 4 hr with minimal loss of cell viability.

3. Isolation and Expansion of Urine Cells

NOTE: Perform the following steps under sterile conditions in a BSL2 Biological Safety Cabinet.

  1. Using sterile pipettes, transfer urine samples to sterile 50-ml centrifuge tubes. Centrifuge at 400 × g for 10 min at RT.
  2. Aspirate the supernatant leaving 1 ml in the tube; be careful not to disturb the cell pellet.
  3. Resuspend and combine the pellets from multiple tubes into 7 ml of washing buffer and repeat centrifugation at 400 × g for 10 min at RT.
  4. Carefully aspirate the supernatant, leaving the cell pellet and ~0.2–0.5 ml of supernatant. Resuspend in 2–3 ml of Urinary Progenitor Cell (UPC) medium and transfer the suspension into 4–6 wells of an uncoated 24-well plate.
  5. After 72 hr, supplement the culture with 0.5 ml of fresh UPC medium per well and change medium every 2–3 days after. The erythrocytes and squamous cells that do not attach to the plate will be removed with the medium changes.
  6. Monitor culture after 4–6 days.
    NOTE: Small 2–4 cell colonies will start to appear. Cells will be rounded or elongated which represent type I or type II of renal epithelial (RE) cells respectively3.
  7. Change the medium every 2–3 days since once the cells appear, they will undergo a rapid expansion phase.
  8. Once the cells reach 80–90% confluence, around 9–15 days after plating, dissociate and passage the cells (15,000–18,000 cells/cm2) onto 2–4 wells of 24 well plate for further expansion. Mark this as cell passage 1 (P1).
  9. Characterize urine cells for lineage specifications through flow cytometric analysis, immunohistochemical staining or through reverse transcriptase-polymerase chain reaction (RT-PCR).
  10. Reprogram isolated urine cells (section 4) or freeze them down in Freezing Medium (DMEM supplemented with 10% serum and 10% DMSO) for long-term cryostorage.

4. Urine Cell Reprogramming Using Sendai Virus

NOTE: The proper handling and the use of PPE (personal protective equipment) is recommended while manipulating the transfecting agents. Perform the following steps under sterile conditions in a BSL2 Biological Safety Cabinet. The proper disposal of transfecting agent and/or transfected cells is recommended to avoid risk of environmental and health hazards. For urine cell reprogramming, use a Sendai Reprogramming Kit with modifications to the manufacturer’s feeder-dependent protocol as detailed below.

  1. To ensure high efficiency reprogramming using the Sendai virus, use passages 1–5 of urine cells that are rapidly dividing. If the cells do not replicate well or become senescent, discard them as they will not reprogram efficiently.
  2. Seed 60,000 cells per well in two wells of a 6 well plate. Mark this as Day -2. Adjust cell seeding density (5 x 104 – 9 x 104 cells per well) as needed to reach 80–90% confluence by Day 0.
  3. On Day 0 (48 hr after plating the cells), prepare the Sendai reprogramming vectors (SeV) containing each of the four OSKM factors. Add each of the vectors to 1 ml of pre-warmed UPC medium. Use an MOI of 1–1.5 (5–7.5 x 105 CIU), which is sufficient for reprogramming urine cells. Aspirate the medium and slowly add the 1 ml UPC + SeV to one well of the urine cells. Use the second well as the transduction negative control.
  4. On Day 1, replace the UPC + SeV medium with fresh UPC medium. Some cell death is seen after 24 h due to viral cytotoxicity.
  5. Depending on efficiency of reprogrammed clone formations and the compact morphology, keep changing the medium daily until day 6 or 7.
  6. One day prior to dissociation of transduced cells (day 5 or 6), prepare MEF feeder plates by plating Mitomycin-C (10 µg/ml for 3 hr) treated-MEFs at density of 5 x 104 cells/cm2, on 0.1% gelatin coated 100 mm2 culture dishes.
  7. Next day (day 6 or 7), dissociate the cells with 0.25% trypsin, resuspend the cells in UPC medium and plate 5 x 104 – 2 x 105 cells/100 mm2 MEF feeder plate.
  8. The following day, switch to hES medium and change the medium every day. Observe the cells under a microscope to monitor transformed cells.
    NOTE: The cells form clonal aggregates with characteristic cobblestone morphology and having higher nucleus to cytoplasmic ratio (12–18 days post transduction).
  9. Within two to three weeks after transduction, pick colonies and transfer to new plates for clonal expansion.
  10. Perform live cell staining for selecting iPSC clones by incubating cells with TRA-1-81 antibody for 1 hr at 37 °C in CO2 incubator followed by counter staining with specific florescent dye conjugated secondary antibody for 1 hr at 37 °C in CO2 incubator.
  11. Use a 26 G 1½ inch needle to cross-hatch the larger TRA-1-81 positive iPSC clones into small equal sized pieces (4–6 pieces per clone).
  12. Use a sterile pipette-tip to pick and transfer 10–20 cross-hatched pieces from multiple clones into each well of Matrigel (10 µg/cm2)-coated 24 well plate with hES medium.
    NOTE: Pieces from a single clone plated individually into a single well do not expand or maintain pluripotency.
  13. Change from hES to iPSC medium 24–48 hr after the reprogrammed clones are attached to the Matrigel surface.
  14. During maintenance on Matrigel-coated plates, manually scrape-off any differentiated cells or contaminating MEF feeder cells using a pipette-tip to enrich for fully reprogrammed and pluripotent dystrophic iPSC (MD-iPSC) clones.
  15. After individual clones have reached ~100 μm size, expand the clones by dissociating with 0.48 mM EDTA (ethylenediaminetetraacetic acid) solution for 3 min and plating small cell aggregates of MD-iPSCs suspended in iPSC medium (supplemented with 5 μM Y27632, RhO Kinase inhibitor) on fresh matrigel (10 µg/cm2) coated 12 well plate. Change iPSC medium daily.
  16. Full reprogramming of each clone can be determined by both gene expression analysis of OSKM genes and immunohistochemical staining of pluripotency markers (Oct3/4 and TRA-1-81). A rigorous evaluation of pluripotency potential should be employed to confirm fully reprogrammed iPSC lines can differentiate into three germ layers. This can be accomplished either by embryoid body (EB) formation and differentiation assay or a teratoma formation assay.

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Representative Results

Most progenitor cells isolated from human urine are positive for uroepithelial progenitor and pericyte markers such as CD44, CD73, and CD146 (97.37%, 97.09%, and 97.3% respectively; Figure 1A and 1B). These cells also expressed other mesenchymal markers such as alpha-smooth muscle actin and vimentin (Figure 1B). RT-PCR analysis gives evidence of a mixed population of cells in the cultures in that there is weak expression of Cytokeratin-7 (CK-7) and Uroplakin (UP)-Ia & -IIIa, markers of uroepithelial lineage (Figure 1C).

The reprogramming steps are summarized by schematic in Figure 2A. Representative images demonstrate the morphology of the cells during different time points throughout the protocol (Figure 2B). The urine cells transform from elongated, type II cells (Day 0) into a cobblestone pattern (Day 4) during reprogramming. By Day 12, typical pluripotent clones (iPSC) are seen and are able to maintain their pluripotent morphology under feeder free conditions (iPSC-P2). Live cell staining for TRA-1-81 identifies reprogrammed clones (Figure 2C).

To confirm the generation of vector and transgene free pluripotent clones, RT-PCR is performed using primers against the SeV viral genome and each of the exogenous OSKM factors. The up-regulation of endogenous reprogramming factors can also be confirmed at this step. The exogenous gene expression is no longer detected by passage-13, but the up-regulation of endogenous factors is seen (Figure 3A). Immunofluorescent staining confirms pluripotency marker expression on iPSCs (Oct3/4 and TRA-1-81; Figure 3B). The endogenous reprogramming gene expression seen in urine cells may lead these cells to reprogram at higher efficiencies1, as compared to other somatic cell sources. The expression of dystrophin gene and protein is verified by immunofluorescence staining, western blot (WB) and RT-PCR analyses (Figure 3C-E). Immunofluorescent staining of wild type UCs and iPSCs for dystrophin demonstrate evident nuclear localization11 in iPSCs, but very few UCs expressed positive (Figure 3C). To verify dystrophin expression in the cells, immunoblot analysis for dystrophin revealed that the ubiquitous dystrophin isoform (Dp71) is the predominant isoform produced in wild type iPSCs, while dystrophic iPSCs lacking dystrophin gene expression has undetectable Dp71 expression (Figure 3D). The exon deletion mutations of dystrophin can be confirmed in the dystrophic iPSCs using specific primers flanking the deleted exons. No PCR amplification is detected in the dystrophic iPSCs whereas wild type iPSCs demonstrate dystrophin transcript amplification (Figure 3E).

Figure 1
Figure 1. Characterization of isolated Urine Cells (UCs) shows uroepithelial progenitor, mesenchymal and smooth muscle lineages. (A) Flow cytometric analysis of UCs probed with conjugated antibodies against uroepithelial and pericyte markers CD44, CD73 and CD146. (B) Immunofluorescent staining of UCs with CD44, αSMA and Vimentin. (C) Gene expression profile of UCs show weak expression of CK-7 and UP-Ia and UP-IIIa as compared to positive control samples while gene expression of alpha-smooth muscle actin (αSMA) is comparable to positive control. Please click here to view a larger version of this figure.

Figure 2
Figure 2. Reprogramming of UC to generate iPSCs. (A) Schematic overview of the reprogramming timeline. (B) Images representing different morphologies of UCs during the SeV transduction, at Day 0 (SeV transduction), Day 4 (morphological transition), Day 12 (pluripotent clones emerging on MEFs) and the characteristic iPSC clone under feeder-free conditions (iPSC-P2 on Matrigel). (C) Live cell imaging for TRA-1-81 to identify pluripotent colonies at Day 17. Please click here to view a larger version of this figure.

Figure 3
Figure 3. Generation of Viral Genome and Transgene Free iPSCs. (A) Gene expression analysis shows the presence of the SeV genome and OSKM transgenes at passage 2 (iPSC-P2) and their disappearance by passage 13 (iPSC-P13) while endogenous gene expression persists throughout. (B) Phase contrast images and immunofluorescence comparing Oct3/4 and TRA-1-81 staining in UCs and resultant iPSCs. (C) Dystrophin is detected by immunofluorescence in wild-type iPSCs compared to wild-type UCs, and (D) the specific dystrophin isoform (Dp71) can be confirmed by WB. (E) RT-PCR analysis is used to confirm the specific dystrophin exon deletion in the dystrophic iPSCs compared to wild-type UCs and iPSCs. Please click here to view a larger version of this figure.

Name of Reagent/Material/Equipment Company Catalog Number Comments
GAPDH-Forward Primer IDT Inc. Seq given in comments GTGGACCTGACCTGCCGTCT
GAPDH-Reverse Primer IDT Inc. Seq given in comments GGAGGAGTGGGTGTCGCTGT
CK7-Forward Primer IDT Inc. Seq given in comments TGGTGCTGAAGAAGGATGTG
CK7-Reverse Primer IDT Inc. Seq given in comments CACGCTGGTTCTTGATGTTG
Up-Ia-Forward Primer IDT Inc. Seq given in comments ACGTCCTACACCCACCGTGA
Up-Ia-Reverse Primer IDT Inc. Seq given in comments ACCCCACGTGTAGCTGTCGAT
Up-IIIa-Forward Primer IDT Inc. Seq given in comments ACAAACAGAGGGTGGGAGGA
CAG
Up-IIIa-Reverse Primer IDT Inc. Seq given in comments AGAAGGGCAGGGAGCCCAGG
αSMA-Forward Primer IDT Inc. Seq given in comments ACCCACAATGTCCCCATCTA
αSMA-Reverse Primer IDT Inc. Seq given in comments TGATCCACATCTGCTGGAAG
Oct3/4 (Exogenous)-Forward Primer* IDT Inc. *Life Tech-Cytotune kit CCCGAAAGAGAAAGCGAACCAG
Oct3/4 (Exogenous)-Reverse Primer* IDT Inc. *Life Tech-Cytotune kit AATGTATCGAAGGTGCTCAA
Sox2 (Exogenous)-Forward Primer* IDT Inc. *Life Tech-Cytotune kit ATGCACCGCTACGACGTGAG
CGC
Sox2 (Exogenous)-Reverse Primer* IDT Inc. *Life Tech-Cytotune kit AATGTATCGAAGGTGCTCAA
Klf4 (Exogenous)-Forward Primer* IDT Inc. *Life Tech-Cytotune kit TTCCTGCATGCCAGAGGAGCCC
Klf4 (Exogenous)-Reverse Primer* IDT Inc. *Life Tech-Cytotune kit AATGTATCGAAGGTGCTCAA
cMyc (Exogenous)-Forward Primer* IDT Inc. *Life Tech-Cytotune kit TAACTGACTAGCAGGCTTGTCG
cMyc (Exogenous)-Reverse Primer* IDT Inc. *Life Tech-Cytotune kit TCCACATACAGTCCTGGATGAT
GATG
SeV (Exogenous)-Forward Primer* IDT Inc. *Life Tech-Cytotune kit GGATCACTAGGTGATATCGAGC
SeV (Exogenous)-Reverse Primer* IDT Inc. *Life Tech-Cytotune kit ACCAGACAAGAGTTTAAGAGA
TATGTATC
Oct3/4 (Endogenous)-Forward Primer IDT Inc. Seq given in comments CAGTGCCCGAAACCCACAC
Oct3/4 (Endogenous)-Reverse Primer IDT Inc. Seq given in comments GGAGACCCAGCAGCCTCAAA
Sox2 (Endogenous)-Forward Primer IDT Inc. Seq given in comments CAAGATGCACAACTCGGAGA
Sox2 (Endogenous)-Reverse Primer IDT Inc. Seq given in comments GTTCATGTGCGCGTAACTGT
Dystrophin-Forward Primer IDT Inc. Seq given in comments GGCAAAAACTGCCAAAAGAA
Dystrophin-Reverse Primer IDT Inc. Seq given in comments GACCTGCCAGTGGAGGATTA

Table 1. List of Primer Sequences.

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Discussion

Modeling cardiovascular diseases using iPSCs is becoming a common approach to understand the genetic contribution4-6. Some unanticipated difficulties of obtaining cell samples from patients, especially young children, can be avoided by offering the option of a non-invasive approach such as a urine collection. In this young patient population, it is often difficult to collect a volume of urine sufficient to yield enough urine cells for reprogramming. Coaching the young patients to drink fluids 30 min prior to the urine collection improves the success of urine cell isolation. However, repeat urine collections may be necessary in this population. We have combined and adapted two different protocols3,7 in order to optimize the isolation and culture of UCs from patients with muscular dystrophy.

Induced pluripotent stem cells have been generated from either skin fibroblasts or urine cells from muscular dystrophy patients1,2. However, both reprogramming protocols relied on lentiviruses to introduce the reprogramming factors into the somatic cells. This integrating virus delivery method can be problematic if the transgene randomly integrates into the host genome and causes either transgene reactivation or mutagenesis (reviewed in 8). Therefore, we improved upon these techniques by using the Sendai virus to transduce the OSKM transgenes into the urine cells in a non-integrating manner9.

This method using Sendai virus to reprogram UCs offers the advantage of a non-integrating approach with a higher transduction efficiency9,10. Urine cells collected from muscular dystrophy patients are reprogrammed within 2–3 weeks post-transduction. These reprogramming kinetics are comparable to UC reprogramming using lentiviral transduction1. Although this protocol can be scaled to establish feeder-free method for urine cell reprogramming, being an efficient method using Sendai-virus transduction of urine cells isolated from muscular dystrophy patients. This method described relies on MEFs as a feeder-layer in order to fully establish the pluripotent MD clone prior to transfer to feeder-free conditions at passage 2.

The nuclear distribution of the Dp71 isoform of the dystrophin protein has long been established in different embryonic stage cell models11,12. This ubiquitous expression of Dp71 in nuclear matrix fraction of early progenitor/embryonic stage cells suggests their role in nuclear architecture and cell cycle regulation12. Our reprogrammed wild type iPSCs express Dp71; however, its absence in dystrophic iPSCs does not inhibit the reprogramming or pluripotent potential of dystrophic cells. In conclusion, the dystrophic gene mutations are conserved in reprogrammed iPSCs; making it an efficient tool to model dystrophic cardiomyopathy.

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Disclosures

The authors declare that they have no competing financial interests.

Acknowledgments

Development of this protocol was supported by the Advancing a Healthier Wisconsin and the National Center for Advancing Translational Sciences, National Institutes of Health, through Grant Number 8UL1TR000055. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.

Materials

Name Company Catalog Number Comments
Materials
4 Oz. Specimen Cup with Lid STL Medical Supply M9AMSAS340 For Urine Sample Collection
15 ml BD-Falcon Tubes Fisher Scientific 352097
50 ml BD-Falcon Tubes Fisher Scientific 352098
Round Glass Coverslips Fisher Scientific 12-545-81
CytoTune-iPS Sendai Reprogramming Kit Life Technologies A1378-001
PBS, pH 7.4 Life Technologies 10010-023
Pen-Strep w/o Glutamine  Life Technologies 15140-122 Warm in 37 °C water bath before use
RPMI Medium 1640 Life Technologies 11875-093 Warm in 37 °C water bath before use
B-27 Supplement w/Insulin (50x) Life Technologies 17504-044 Warm in 37 °C water bath before use
B-27 Supplement w/o Insulin (50x) Life Technologies 0050129SA Warm in 37 °C water bath before use
DMEM/F12 (1:1) Life Technologies 11330-032 Warm in 37 °C water bath before use
Versene, 1:5,000 Life Technologies 15040066 Warm in 37 °C water bath before use
bFGF (10 µg) Life Technologies 13256-029 Warm in 37 °C water bath before use
Cell Counter Cartridges Life Technologies C10228
Knockout Serum (500 ml Bottle) Life Technologies 10828-028 Warm in 37 °C water bath before use
Recovery Cell Culture Freezing Medium Life Technologies 12648-010
Keratinocyte-SFM (1x), Liquid Life Technologies 17005-042 Warm in 37 °C water bath before use
DMEM, High Glucose, Glutamax Life Technologies 10566-016 Warm in 37 °C water bath before use
Ham's F-12 Nutrient Mix  Life Technologies 11765-054 Warm in 37 °C water bath before use
EGF Recombinant Human Protein, Liquid Form Life Technologies PHG0311L Warm in 37 °C water bath before use
Insulin, Human Recombinant, Zinc Soln Life Technologies 12585-014 Warm in 37 °C water bath before use
TeSR-E8 Stem Cell Technologies 5940 Warm in 37 °C water bath before use
ROCK Inhibitor (Y-27632) Selleck S1049 Warm in 37 °C water bath before use
Matrigel BD Biosciences 354277 hESC Qualified Matrix, LVED Free
RNeasy Mini Kit  Qiagen 74104
iScript cDNA Synthesis Kit Bio-Rad 170-8890
DreamTaq Green PCR Master Mix (2x) Thermo-Scientific K1081
FBS-Qualified Sigma Aldrich F6178 Warm in 37 °C water bath before use
Adenine Bioreagent Sigma Aldrich A2786-5G Warm in 37 °C water bath before use
Cholera Toxin from Vibrio cholerae Sigma Aldrich C8052-.5MG Warm in 37 °C water bath before use
Hydrocortisone Sigma Aldrich H0888-1G Warm in 37 °C water bath before use
Holo-transferrin from human Sigma Aldrich T0665-50MG Warm in 37 °C water bath before use
3,3',5-Triiodo-L-thyronine sodium salt Sigma Aldrich T6397-100MG Warm in 37 °C water bath before use
DAPI  Santa Cruz Biotechnology SC-3598
Fluoromount Aquous mounting medium Sigma Aldrich F4680
16% Paraformaldehyde Alfa-Aesar 43368
Antibodies
Mouse anti CD44 - labeled with FITC  BD Biosciences 560977
Mouse anti CD146 - labeled with PE BD Biosciences 561013
Mouse anti CD73 - labeled with PE BD Biosciences 561014
Mouse anti-α-smooth muscle actin Sigma Aldrich A2547
Mouse anti-Vimentin Abcam ab8978-100
Mouse Anti - TRA-1-81 Life Technologies 411100
Rabbit anti Oct 3/4 Santa Cruz Biotechnology SC-9081
Mouse Anti Dystrophin Leica Biosystems NCL-DYSB

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References

  1. Guan, X., et al. Dystrophin-deficient cardiomyocytes derived from human urine: New biologic reagents for drug discovery. Stem Cell Research. 12, (2), 467-480 (2014).
  2. Dick, E., et al. Exon Skipping and Gene Transfer Restore Dystrophin Expression in Human Induced Pluripotent Stem Cells-Cardiomyocytes Harboring DMD Mutations. Stem Cells Dev. 22, (20), 2714-2724 (2013).
  3. Zhou, T., et al. Generation of human induced pluripotent stem cells from urine samples. Nat Protoc. 7, (12), 2080-2089 (2012).
  4. Bellin, M., Marchetto, M. C., Gage, F. H., Mummery, C. L. Induced pluripotent stem cells: the new patient. Nat Rev Mol Cell Biol. 13, (11), 713-726 (2012).
  5. Carvajal-Vergara, X., et al. Patient-specific induced pluripotent stem-cell-derived models of LEOPARD syndrome. Nature. 465, (7299), 808-812 (2010).
  6. Sun, N., et al. Patient-Specific Induced Pluripotent Stem Cells as a Model for Familial Dilated Cardiomyopathy. Science Translational Medicine. 4, (130), 130ra147 (2012).
  7. Zhang, Y., et al. Urine derived cells are a potential source for urological tissue reconstruction. J Urol. 180, (5), 2226-2233 (2008).
  8. Bayart, E., Cohen-Haguenauer, O. Technological overview of iPS induction from human adult somatic cells. Curr Gene Ther. 13, (2), 73-92 (2013).
  9. Malik, N., Rao, M. S. A review of the methods for human iPSC derivation. Methods Mol Biol. 997, 23-33 (2013).
  10. Nakanishi, M., Otsu, M. Development of Sendai virus vectors and their potential applications in gene therapy and regenerative medicine. Curr. Gene Ther. 12, (5), 410-416 (2012).
  11. González-Ramírez, R., Morales-Lázaro, S. L., Tapia-Ramírez, V., Mornet, D., Cisneros, B. Nuclear and nuclear envelope localization of dystrophin Dp71 and dystrophin-associated proteins (DAPs) in the C2C12 muscle cells: DAPs nuclear localization is modulated during myogenesis. J Cell Biochem. 105, (3), 735-745 (2008).
  12. Villarreal-Silva, M., Centeno-Cruz, F., Suárez-Sánchez, R., Garrido, E., Cisneros, B. Knockdown of dystrophin Dp71 impairs PC12 cells cycle: localization in the spindle and cytokinesis structures implies a role for Dp71 in cell division. PloS One. 6, (8), e23504 (2011).

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