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2 protocols using nucleoporin 62

1

Subcellular Fractionation and Protein Analysis

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Nuclear and cytoplasmic fractions were isolated using a Nuclear Extract Kit (Active Motif, Carlsbad, CA, version C4) per manufacturer’s instructions. This separates the fractions by hypotonic lysis of the cytoplasm, to isolate cytoplasmic proteins, followed by complete lysis of nuclei via detergent and denaturation of each fraction. Purified fractions were assayed for protein concentration using a Bradford-based method (BioRad) and prepared for electrophoretic separation of proteins in both nuclear and cytoplasmic fractions. Samples were denatured in reducing buffer, heated to 95°C for 10 minutes, and run on a 3–8% Tris-Acetate gel (Invitrogen; Carlsbad, CA). Following SDS/PAGE, proteins were transferred to nitrocellulose membranes, which were probed for FANCD2 (1:100) and nucleoporin 62 (1:200) (Santa Cruz Biotechnology; Santa Cruz, CA) or α-tubulin (1:900) (Sigma,-Aldrich, St. Louis, MO) as an additional loading control. HRP-conjugated secondary antibodies were then used for signal detection. Bands were visualized using Supersignal West Pico and West Femto chemiluminescence (ThermoScientific; Rockford IL) on Blue Basic Autorad film (BioExpress; Kaysville, UT).
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2

Western Blot Analysis of Stem Cell Markers

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Total cell lysates were obtained by adding RIPA buffer (R0728, Sigma-Aldrich) and protease inhibitor cocktail (P2714, Sigma-Aldrich). Equilibrated protein samples were loaded into a 10% SDS-Page gel, electrophoresed and then electro-transferred to a PVDF membrane (Bio-Rad). Transferred membranes were blocked with a blocking buffer containing 5% non-fat milk (Labscientific, M0841). The following monoclonal antibodies were used: Nanog (Cell Signaling, D73G4), CD133 (Cell Signaling, D2V8Q), CD44 (Cell Signaling, 8E2), ALDH1/2 (Santa Cruz, sc-166362), ALDH1 (Cell Signaling, D9J7R), MDR1/ABCB1 (Cell Signaling, E1Y7B), HIF1-α (Cell Signaling, D5F3M), ABCG2 (Cell Signaling, D5V2K), nucleoporin-62 (Santa Cruz, sc-48373), EpCAM (Cell Signaling, VU1D9) and EPAS-1 (Santa Cruz, 190B). Target proteins were visualized with the secondary mouse or rabbit IgG antibodies and a chemiluminescent substrate (Santa Cruz, sc-2048). All Western blot results were normalized by total protein (Fig. S5). All Western blot experiments were reproduced and performed three times for quantification.
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