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5 protocols using snail

1

Protein Expression Analysis in Cell Lines

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The total protein of cells at the logarithmic phase was extracted by a lysis buffer. BCA Protein Assay Kit (Beyotime, Shanghai, China) was used to measure the total protein concentration. The harvested samples were heated for 10 min at 100 °C for denaturation. About 30 μg proteins were separated by gel electrophoresis and transferred to a polyvinylidene difluoride membrane (0.45 μm, Millipore, Billerica, MA, USA). The PVDF membrane was blocked with skimmed milk and then incubated with primary antibodies overnight at 4 °C. After incubation with HRP goat anti-rabbit or goat anti-mouse IgG antibody (Proteintech, Wuhan, China), the protein signal was captured with autoradiography films. The E-Cadherin, p-GSK-3βSer9 and β-catenin antibodies were all obtained from Cell Signaling Technology. GSK3β, N-Cadherin, c-Myc, CyclinD1 and Gapdh antibodies were purchased from Proteintech, while EphA5 was purchased from Invitrogen. Snail was purchased from R&D Systems.
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2

Immunohistochemistry Antibody Panel for Cell and Tissue Analysis

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The following primary antibodies were used in this study: Beta-catenin (RRID:AB_397555, BD Transduction labs, Billerica, MA, 610154, 1:500), Brachyury (RRID:AB_2200235, R and D, AF2085, 1:100), CD31 (RRID:AB_394819, BD Biosciences, 553373, 1:100) CD105 (RRID:AB_354735, R and D Systems, AF1320, 1:100), E-cadherin (RRID:AB_477600, Millipore Sigma, U3254, 1:200), Endoglin (CD105) (RRID:AB_354735, R and D Systems, AF1320, 1:300), Flk-1 (RRID:AB_355500, R and D Systems, AF644, 1:200) Gata6 (RRID:AB_10705521, D61E4 XP, Cell Signaling, 5851, 1:500), GFP (RRID:AB_300798, Abcam, ab13970), Laminin (RRID:AB_477163, Millipore Sigma, L9393, 1:500), N-cadherin (RRID:AB_2077527, BD Biosciences, 610920, 1:200), Pecam-1 (RRID:AB_394819, BD Biosciences, 553373, 1:200), RFP (Rockland, Limerick, PA, 600-400-379, 1:300), Snail (RRID:AB_2191738, R and D Systems, AF3639, 1:50), Sox2 (RRID:AB_11219471, Thermo Fisher Scientific, 14-9811-82, 1:200), Sox17 (RRID:AB_355060, R and D Systems, AF1924, 1:100), ZO-1 (RRID:AB_87181, Invitrogen, 33–9100, 1:200).
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3

Apoptosis and Cell Proliferation Assay

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Fetal bovine serum (FBS), antibiotics (penicillin-streptomycin), and Dulbecco’s modified Eagle’s medium (DMEM) were obtained from Gibco-BRL (Grand Island, NY, USA); 3-(4, 5-dimethylthiazol-2-yl)-2; dimethyl sulfoxide (DMSO) and in situ Cell Death Detection Kit (TMR red) from Sigma-Aldrich (St. Louis, MO, USA); 5-diphenyltetrazolium bromide (MTT) from Molecular Probes (Eugene, OR, USA). The following antibodies were used: GAPDH, Bcl-2, survivin, caspase-3, caspase-8, cleaved caspase-3, PCNA and p53 (Cell Signalling, Danvers, MA, USA), PARP, and Bcl-xL (Santa Cruz Biotechnology, Dallas, TX, USA), matrix metalloproteinase (MMP)-2 (Bioss Antibodies Inc., Woburn, Massachusetts, USA), MMP-9, Ki-67, and alexa 488/594 (Abcam, Cambridge, UK), and p21, cyclin D1, CDK4, Bak, tBID, E-cadherin, vimentin, and snail (R&D Systems, Minneapolis, MN, USA). Annexin V-FITC Apoptosis Detection Kit, propidium iodide (PI), Hoechst 33342 staining kit, Matrigel, and various caspase inhibitors were purchased from BD Biosciences (San Jose, CA, USA).
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4

Immunostaining of Pluripotency and EMT Markers

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Gels were rinsed twice with PBS and fixed with 4% paraformaldehyde (Thermo Fisher Scientific) in PBS for 25 min at room temperature. Following fixation, gels were permeabilized with 0.2% Triton X-100 in PBS for 1 h at room temperature. They were then blocked with 3% BSA in PBS containing 0.01% Triton X-100 for 3 h at room temperature. The samples were then incubated for 24 h at 4 °C with the primary antibody Nanog (1:100; α-Rabbit; Cell Signaling Technologies), SOX2 (1:100; α-Rabbit; Cell Signaling Technologies), Oct4 (1:200; α-Rabbit; Cell Signaling Technologies), Vimentin (1:200; α-mouse; Santa Cruz), SNAIL (1:200; α-Goat; R&D Systems), Brachyury (1:100; α-Goat; R&D Systems), or RUNX2 (1:100; Mouse; Cell Signaling Technologies). After washing for 3-5 h at room temperature, samples were incubated overnight at 4 °C with secondary antibody Alexa 647 goat-α-Rabbit (1:1000 in PBS; Invitrogen), Alexa Fluor donkey-α-Goat (1:1000 in PBS; Invitrogen), or Alexa 488 goat-α-mouse (1:1000 in PBS; Invitrogen), DAPI (1:2,000, Invitrogen) and phalloidin-Alexa 555 (1:500; Abcam). After at least 3 hours of washing, samples were mounted in Vectashield (Vector Laboratories) before imaging.
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5

SDS-PAGE and Western Blotting Assay

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SDS-PAGE and Western blotting were performed according to standard protocols. Cells were lysed in RIPA lysis buffer (50 mM Tris/HCl, pH 8.0, 250 mM NaCl, 1% NP40, 0.5% (w/v) Sodium Deoxycholate, 0.1% Sodium Dodecylsulfate, complete mini protease inhibitor tablets (Roche)). Lysates were sonicated and centrifuged at 16.060 g for 15 min, 4°C. 100 μg of whole cell lysate per lane was separated using 10% SDS-Acrylamide gels and transferred on Immobilon PVDF membranes (Millipore). ECL signals were recorded using a CF440 Imager (Kodak). Antibodies used: CST5 (Santa Cruz, sc-46890, 1:200), p21 (Neomarkers, CP-74, 1:1000), SNAIL (R&D Systems, AF3639, 1:250), β-actin (Sigma, A2066, 1:1000).
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