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3 protocols using β cadherin

1

Protein Expression Analysis in Cell Lysates

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Cell lysis was prepared on ice and subjected to centrifugation at 4°C, 14 000 g/min for 10 minutes. Proteins were quantified using a BCA Protein Assay Kit (Sigma‐Aldrich) and separated by 10% SDS‐PAGE gel. Subsequently, proteins were loaded on a PVDF membrane (Millipore, Billerica, MA), and incubated with specific antibodies. Antibodies were purchased from Abcam (SELM, PI3K, phosphor‐PI3K, mTOR, phosphor‐mTOR, vimentin, N‐cadherin, and β‐cadherin), Cell Signaling Technology (Akt, phosphor‐Akt, MMP2, MMP9, anti‐rabbit, and anti‐mouse secondary antibodies), and Arigo (GAPDH).
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2

Epithelial-Mesenchymal Transition Protein Analysis

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The compounds emodin and 4’,6-diamidino-2-phenylindole (DAPI) were purchased from Sigma Chemical Co. (St. Louis, MO, USA). Human recombinant TGF-β was purchased from R&D Systems (Minneapolis, MN, USA). Primary antibodies against Snail, E-cadherin, β-cadherin, MMP-2 and Slug were purchased from Cell Signaling Technology (Beverly, MA, USA). Primary antibody against vimentin was purchased from Abcam Inc. (Cambridge, MA, USA). Primary antibodies against Twist were purchased from Santa Cruz Biotechnology (Santa Cruz, CA, USA). Primary antibody against β-actin was purchased from Sigma Chemical Co. (St. Louis, MO, USA). Secondary antibodies, HRP-conjugated Goat anti-Mouse IgG and Goat anti-Rabbit IgG, were obtained from Millipore (Billerica, MA, USA).
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3

Immunoblot Analysis of Signaling Pathways in Tumor Xenografts

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Protein concentrations of the total cellular protein extracts from tumor xenografts and cell line lysates were determined using the Bio-Rad protein assay (Bio-Rad, Hercules, CA, USA). Total protein (50 μg per sample) from either tumor xenograft or cell line lysates was electrophorectically separated on 10% SDS polyacrylamide gels and electro-blotted onto a Hybond membrane. After incubation with 5% nonfat milk in Tris-buffered saline containing 0.1% Tween-20, the blots were probed with anti-phospho p-Erk1/2 (Thr202/Tyr204), p-Creb (Ser133), p-Rsk2 (Ser386), p-Src (Tyr416), p-Fak (Tyr576/577), p-Pax (y118), p-Pkcα (s657), and p-Stat3 (y705), polyclonal rabbit antibodies (Cell Signaling Technology Inc., Davners, MA). The same blots were subsequently stripped and re-probed with anti-total (t) Her2, Her3, Erk1/2, cSrc, Creb, Fax, Pax, Pkcα, Rsk2, Stat3, Fascin, E-Cadherin, β-Cadherin, Vimentin, Snail, and β-Actin antibodies (Cell Signaling Technology Inc.).
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