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6 protocols using ab154812

1

Protein Purification and Western Blot Analysis

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Proteins were purified from 3t3 cells and BLA tissue. Cells and tissue were lysed using a lysis buffer containing Tris pH 7.4 50 mM, NaCl 150 mM, EDTA 5 mM, Triton X-100 1%, protease inhibitors cocktail (Roche, Mannheim, Germany) and protease and phosphatase inhibitors cocktail (ThermoScientific, Rockford, USA)). Cell/tissue homogenate was sonicated and total protein content was quantified using a commercial kit (PierceTM BCA Protein Assay Kit, Thermoscientific) with assistance of the software GEN5 (BioTek, Vermont, USA).
Western Blot analysis was conducted using the following primary antibodies and dilutions: anti-PTEN: 1:1000, ab154812 (Abcam, Cambridge, UK), anti-beta actin 1:2000, A0760–40 (USBiological, Massachusetts, USA) and anti-GAPDH 1:3000, ab9485 (Abcam), anti-CREB 1:250, 48H2 (Cell Signalling, Boston, Massachussets). Secondary antibody signals were detected using the ClarityTM Western ECL detection kit (BioRad, California, USA) and the software FluorchemTM HD2 (Alpha Innotech, Biozym, Vienna, Austria). Quantification of optical densities was performed using the program ImageJ (Maryland, USA) and values were normalized to those of housekeeping genes (beta actin and GAPDH).
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2

Western Blot Analysis of PTEN, Stat3 in RLS40 and B16 Cells

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Cell lysates from RLS40 and B16 cells were collected in radioimmunoprecipitation assay (RIPA) buffer (Thermo Scientific, Waltham, MA, USA), separated in 12.5% sodium dodecyl sulfate (SDS)/PAGE and transferred to a poly(vinylidene difluoride) (PVDF) membrane using a semidry transfer. Western Blot analysis was performed as described earlier [30 (link),39 (link)] using primary antibodies against PTEN (ab154812, 1:800; Abcam, Cambridge, UK), Stat3 (ab68153, 1:500; Abcam, Cambridge, UK), and GAPDH (ab9485, 1:1000; Abcam, Cambridge, UK), and secondary HRP-conjugated goat anti-rabbit antibodies (ab6721; Abcam, Cambridge, UK).
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3

Quantitative Western Blot Analysis

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Cells remaining after the seeding for clonogenic assays were pelleted by centrifugation, lysed in 20 mM Tris HCl pH 7.5, 400 mM NaCl, 5 mM DTT, 20 % glycerol, 0.1 % NP40, 1 mM Pefabloc, Protease Inhibitory Cocktail (Roche), phosSTOP (Roche), 100 nM Ku-0058948, 1 µM ADP-HPD (Trevigen) and analysed by western blot as previously described [11 (link)]. Antibodies used were rabbit anti-PAR (1/1000, 4336-BPC-100, Trevigen), anti-PARG (1/2000, [8 (link)]), anti-actin (1/500, A2066, Sigma), anti-PTEN (1/2000, ab154812, Abcam) and anti-BRCA1 (1/5000, 07-434, Millipore) antibodies. Secondary antibodies were either an Alexa Fluor 680 goat anti-rabbit (1/30,000, Invitrogen) or a peroxidase-coupled goat anti rabbit (1/50,000, Invitrogen), revealed either with Odyssey Infrared Imaging System (Li-Cor, Bioscience) or by chemiluminescence and autoradiography.
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4

Protein Expression Analysis in Tissues

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The total protein of tissues was extracted using radio-immunoprecipitation assay lysate (strong) (R0010, Solarbio). The protein concentration was determined using the BCA kit (20201ES76, Yeasen Company, Shanghai, China). The protein was separated on polyacrylamide gel electrophoresis and transferred onto the polyvinylidene difluoride membrane. After that, the membrane was blocked with 5% bovine serum albumin for 1 h and incubated with the following diluted primary antibodies at 4 °C overnight: PTEN (1:5000, ab154812, Abcam), Cleaved caspase-3 (1:500, ab13847, Abcam), Bax (1:500, ab53154, Abcam), Bcl-2 (1:1000, ab196495, Abcam), AKT (1:500, ab38449, Abcam), pAKT (1:1000, #9271, Cell Signaling Technology, Beverly, MA, USA), mTOR (1:10,000, ab134903, Abcam), pmTOR (1:1000, #2971, Cell Signaling Technology), and β-actin (1:5000, ab8226, Abcam). Following tris-buffered saline-tween buffer washing (5 min × 3 times), the membrane was added with horseradish peroxidase-labeled goat anti-rabbit IgG (ab205718, 1:20,000, Abcam). The membrane was added with enhanced chemiluminescence for development. ImageJ 1.48 u software (National Institutes of Health) was used for protein quantitative analysis, and the grayscale ratio of each protein to internal reference β-actin was used for protein quantitative analysis. The experiment was repeated three times.
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5

Western Blot Protocol for PTEN Detection

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Cells were lysed in RIPA buffer containing protease inhibitors (Sigma, Oakville, Canada). Equal amounts of proteins were resolved on 10% SDS-PAGE and transferred to a nitrocellulose membrane (BioRad, CA, USA). Membranes were blocked in TBS containing 5% non-fat dry milk and exposed overnight at 4 °C to rabbit-anti-PTEN (ab154812, Abcam, MA, USA) or mouse-anti-β-Actin (A5316, Sigma, Oakville, Canada) antibodies. Membranes were washed in TBST (TBS-0.05% Tween-20) and incubated with either anti-rabbit or anti-mouse peroxidase-conjugated secondary antibody for 1 hour at room temperature and the blots were developed using Immobilon Western HRP Substrate (Millipore, Etobicoke, Canada).
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6

Retinal PTEN/Akt/Bcl-2 Immunohistochemistry

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Retinal sections (10 lm) through the optic nerve head were selected for each eye. Deparaffinized retinal sections were immersed in proteinase K solution for antigen retrieval and blocked in 10% goat serum for 1 hour. The sections then were incubated with the following primary antibodies at 48C overnight: PTEN (1:100, ab154812; Abcam, Cambridge, UK), p-Akt (1:200, 4060S; Cell Signaling Technology, Beverly, MA, USA) and B-cell lymphoma 2 (Bcl-2, 1:100, ab7973; Abcam). After thorough washing with PBS, the sections were exposed to their corresponding secondary Cy3 antibodies (1:300) for 1 hour at room temperature, after which they were counterstained with DAPI, washed again, coverslipped, and examined under a fluorescence microscope.
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