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5 protocols using alkaline phosphatase live stain kit

1

Alkaline Phosphatase Staining of iPSCs

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Alkaline phosphatase staining was performed using an Alkaline Phosphatase Live Stain Kit (Thermo Fisher, Waltham, MA, USA) and following the manufacturer’s instructions. IPSCs colonies were visualized with Olympus iX73 (Olympus, Tokyo, Japan).
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2

Generating Human iPSCs from PBMCs

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Peripheral blood mononuclear cells (PBMCs) were reprogrammed to human iPSCs (hiPSCs) using the CytoTune-iPS 2.0 Sendai Reprogramming Kit (ThermoFisher) according to manufacturer’s instructions. All hiPSC lines used in this assay were rigorously tested for pluripotency markers, tested negative for mycoplasma, underwent WGS and underwent short tandem repeat (STR) profiling analysis (LabCorp) to authenticate purity of cell lines. In addition, all hiPSC lines were tested for live alkaline phosphatase activity using the Alkaline Phosphatase Live Stain kit (Thermofisher) according to manufacturer’s instructions.
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Alkaline Phosphatase and SSEA-4 Detection

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Alkaline Phosphatase detection was executed using the Alkaline Phosphatase Live Stain kit (Life Technologies, Cat. # A14353) according to manufacturer’s instructions. Cells were visualized using a Keyence BZ-X700 series microscope. SSEA-4 detection was carried out using the StainAlive SSEA-4 mouse anti-human antibody (Reprocell, Cat. # 09–0097). Antibody was diluted 1:200 in mTeSR1 and cells were incubated in antibody containing medium for 30 min in standard culture conditions. The staining medium was removed and the cells washed gently 2 times with mTeSR1. Fresh media was added and the cells were visualized using a Keyence BZ-X700 series microscope.
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4

Directed Differentiation of Pluripotent Stem Cells

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hESC lines H1 and H9 were obtained from WiCell Research Institute. iPS-MSC25 (link) (derived from human mesenchymal stem cells) and iPS-Fib225 (link) (derived from human dermal fibroblasts) were a kind gift from George Q. Daley at Children’s Hospital Boston. Essential 8 medium (E8)5 (link), 0.5 mM EDTA, Accutase, ProLong® Antifade reagents, LIVE/DEAD® Cell Viability staining kit, Click-iT® EdU Alexa Fluor® 594 Imaging Kit and Alkaline Phosphatase Live Stain kit were obtained from Life Technologies. Small molecules Y-27632 (ROCK inhibitor, or RI), SB431542, and LDN193189 were from Selleckchem. Matrigel was obtained from BD Biosciences. PNIPAAm-PEG polymer (Mebiol Gel) was from Cosmo Bio, USA. SCID Beige mice were from Charles River Laboratory. Finally, the following antibodies and dilutions were used: Oct4 and Nanog (Santa Cruz Biotech, 1:100); FOXA2 or HNF3β (Santa Cruz Biotech, 1:200); Nestin (Millipore, 1:200); αSMA (Abcom, 1:200).
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5

Alkaline Phosphatase and SSEA-4 Detection

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Alkaline Phosphatase detection was executed using the Alkaline Phosphatase Live Stain kit (Life Technologies, Cat. # A14353) according to manufacturer’s instructions. Cells were visualized using a Keyence BZ-X700 series microscope. SSEA-4 detection was carried out using the StainAlive SSEA-4 mouse anti-human antibody (Reprocell, Cat. # 09–0097). Antibody was diluted 1:200 in mTeSR1 and cells were incubated in antibody containing medium for 30 min in standard culture conditions. The staining medium was removed and the cells washed gently 2 times with mTeSR1. Fresh media was added and the cells were visualized using a Keyence BZ-X700 series microscope.
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