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3 protocols using hybond pvdfmembranes

1

Quantitative Western Blot Analysis

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For all Western Blot analyses, proteins were separated by
4–12% SDS/PAGE (Life Technologies), transferred to Hybond PVDF
membranes (Amersham), blocked with 5% milk in PBS with 0.1%
Tween 20 (PBS/Tween) for 1 hr, and incubated with the following antibodies:
anti-cleaved caspase-3 (Cell Signaling, 9664), anti-cleaved caspase-7 (Cell
Signaling, 9491), anti-Hsp70 (BD Pharmingen, 610607), anti-IDH1 (Cell Signaling,
8137), anti-H3K4me3 (Millipore, CS200580), anti-H3K9me3 (Active Motif, 39161),
anti-H3K27me3 (Millipore, CS200603), anti-H3K36me3 (Abcam, ab9050), anti-Histone
H3 (Cell Signaling, 4499), anti-ME1 (Abcam, ab97445), anti-FoxO6 (Thermo
Scientific PA5–35117), anti-phospho-FoxO6 (Abcam, ab154832),
anti-phospho-EGFR (Cell Signaling, 2236S), anti-EGFR (Santa Cruz, sc-373746),
anti-phospho-Akt (Cell Signaling, 4060S), and anti-Akt (Cell Signaling, 9272S).
The blots were subsequently incubated with goat anti-rabbit IgG or goat
anti-mouse IgG antibodies (Santa Cruz) in 5% milk in PBS/Tween and
developed with Supersignal West Dura ECL (enhanced chemiluminescence) substrate
(Pierce) following manufacturer’s protocol. Quantification of blots was
determined by densitometry using ImageJ software.
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2

Protein Expression Analysis in Skin Tissues

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The frozen skin tissue samples were dissolved in RIPA buffer (Wako, Osaka, Japan) containing a protease inhibitor cocktail (Sigma-Aldrich, Darmstadt, Germany), homogenized using Bead Mill 24 (Thermo Fisher Scientific), and sonicated. The solubilized sample was collected by centrifugation at 16,900g for 10 minutes. After adjusting the protein concentration (1 ng/ml) using a bicinchoninic acid protein assay kit (Pierce, Rockford, IL), the samples (20 μg/lane) were fractionated by SDS-PAGE and transferred to Hybond-PVDF membranes (Amersham Bioscience, Piscataway, NJ). The blotted membranes were blocked with Tris-buffered saline containing 0.1% Tween-20 and 10% skimmed milk and subsequently incubated overnight at 4 °C with anti-Ninj1 or anti-GAPDH antibodies (Table 1). The target protein bands were visualized using horseradish peroxidase‒conjugated secondary antibodies and quantified using ImageQuant LAS500 (GE Healthcare Life Science, Chicago, IL). ImageJ program was used for densitometry analysis.
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3

Protein Expression Analysis of Pancreatic Tumors in Mice

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Pancreatic tumors in mice were collected and sonicated with lysis buffer, and the protein content was determined using the Bradford assay. An aliquot of the protein solution (10 μg) in each mouse was subjected to sodium dodecyl sulfate-10% polyacrylamide gel electrophoresis (SDS-PAGE), and then electroblotted onto Hybond PVDF membranes (Amersham Bioscience, Little Chalfont, UK). The PVDF membrane was incubated with Tris-buffered saline containing 0.1% Tween 20 and 1 w/v% BSA (1% BSA/TBS-T) at room temperature for 1 h and treated with each primary antibody (diluted 1:1000) in 1% BSA/TBS-T at 4 °C overnight. Subsequently, the membranes were incubated with HRP-conjugated anti-mouse or anti-rabbit secondary antibody-HRP conjugates in 1% BSA/TBS-T at room temperature for 1 h. Protein bands were detected using a chemiluminescence assay (Millipore, Billerica, MA, USA).
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