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6 protocols using anti p73

1

Antibody Characterization for EMT Research

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The following antibodies were used: rabbit polyclonal anti-Slug (1:1000), anti-Twist1 (1:500), anti-ZEB1 and anti-ZEB2 (1:500, Santa Cruz Biotechnology, Santa Cruz, CA). Rabbit monoclonal anti-E-cadherin (1:1000, Santa Cruz). Rabbit polyclonal anti-MDM2 (C-18) (1:500, Santa Cruz). Mouse monoclonal anti-α-tubulin (1:2000) and anti-fibronectin (1:1000) (Cell Signaling, Danvers, MA). Mouse monoclonal anti-N-cadherin (1:500), anti-ZO-1 (1:1000) and anti-vimentin (1:1000) (Abcam, Cambridge, UK). Mouse monoclonal anti-Restin (1:500), anti-His (1:1500) and anti-Flag (1:2000) (Sigma). Mouse monoclonal anti-p73 (1:1000), anti-p53 (1:1000) and anti-p63 (1:1000) (Abcam). Horseradish peroxidase–conjugated secondary antibodies were obtained from Amersham Biosciences.
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2

Antibody Panel for Cellular Signaling

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The following antibodies were used in this study: anti-PGAM1 (NBP1-49532; Novus Biologicals), anti-CtIP (sc-271339; Santa Cruz Biotechnology, Inc.), anti-Mre11 (ab214; Abcam), anti–H2AX-pS139 (9718; Cell Signaling Technology), anti–β-actin (60008-1-Ig; Proteintech), anti–Lamin B1 (12987-1-AP; Proteintech), anti-GAPDH (60004-1-Ig; Proteintech), anti-RPA32 (ab2175; Abcam), anti–RPA32-pS4S8 (NBP1-23017; Novus Biologicals), anti-BrdU (5292; Cell Signaling Technology), anti-Cdh1 (ab3242; Abcam), anti-p21 (2947; Cell Signaling Technology), anti-RAD51 (sc-8349; Santa Cruz Biotechnology, Inc.), anti-PGD (sc-398977; Santa Cruz Biotechnology, Inc.), anti-PHGDH (ab57030; Abcam), anti-IgG (2729; Cell Signaling Technology), anti-Histone H3 (4620; Cell Signaling Technology), anti-p53 (9282; Cell Signaling Technology), anti-p73 (ab202474; Abcam), and anti–Cleaved Caspase-3 (9661; Cell Signaling Technology).
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Western Blot Protein Analysis

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Proteins were separated by electrophoresis based on its molecular weight and transferred from the gel to a PVDF membrane. Then, primary antibodies probing the target protein after the PVDF membrane were blocked by bovine serum albumin. The first antibodies were then detected by second antibodies, which could recognize them conjugated to enzyme horseradish peroxidase. The information of antibodies were as follows: anti-Rb (Epitomics, Burlingame, USA), anti-E2F1(Epitomics, Burlingame, USA), anti-P/CAF monoclonal antibodies (Santa Cruz Biotechnology, Dallas, USA), anti-p73 (Abcam, Boston, USA) and anti-Caspase7 (Abcam, Boston, USA).
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4

Western Blot Analysis of DNA Damage Response Proteins

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The antibodies from this study were as follows: anti-keratin-10, anti-loricrin, anti-TopBP1, and anti-GAPDH (Santa Cruz, Santa Cruz, CA); anti-E2F1, anti-p63, anti-ATR, anti-p-ATR, anti-CHK1, anti-p-CHK1, anti-CHK2, anti-p-CHK2, anti-RAD51, anti-Mre11, anti-NBS1, anti-BRCA1, and anti-BRCA2 (Cell Signaling, Danvers, MA); anti-p73 (Abcam, Cambridge, MA); anti-p53 (Millipore, Burlington, MA); anti-p-TopBP1 (Abgent, San Diego, CA). AKT inhibitors MK2206 (2μM) and LY294002 (25μM) were purchased from SelleckChem (Houston, TX). Cell lysates were processed and assayed by western blot analysis as previously described 60 (link). Briefly, J2 feeders were firstly removed by Versene (PBS containing 0.5 mM EDTA) treatment and keratinocytes were collected and lysed in RIPA lysis buffer on ice for 30 minutes. The samples were then electrophoresed on SDS-page gels and transferred to PVDF membranes. At last the membranes were developed using ECL prime or ECL reagents (Amersham, Pittsburgh, PA) and chemiluminescence signals were detected using Eastman Kodak x-ray films.
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5

Western Blot Analysis of Apoptosis-Related Proteins

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Total cell lysates were generated using lysis buffer (50 mmol/l Tris-HCl pH 7.6, 250 mmol/l NaCl, 0.1% Triton X-100, 5 mmol/l EDTA) supplemented with complete protease inhibitor cocktail (Roche, Grenzach-Wyhlen, Germany) and PhosSTOP Phosphatase Inhibitor Cocktail (Roche). After sonification and boiling, a specific amount of protein was resuspended in Laemmli and analyzed by western blotting. The primary antibodies used were as follows: anti-p53 (clone: DO-1—#sc-126, Pab1801—#sc-98), anti-p63 (clone: 4A4—#sc-8431) (Santa-Cruz Biotechnology, Heidelberg, Germany); anti-BAX (polyclonal—#2772), anti-BAK (polyclonal—#3814), anti-JNK1 (clone: 2C6—#3708) (Cell Signaling, Denvers, MA, USA); anti-p73 (polyclonal—#ab14430) (Abcam, Cambridge, UK); anti-phospho-c-Jun (Ser73) (polyclonal—#06-659) (Upstate, Charlottesville, VA, USA).
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6

Western Blot Analysis of DNA Damage Response Proteins

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The antibodies from this study were as follows: anti-keratin-10, anti-loricrin, anti-TopBP1, and anti-GAPDH (Santa Cruz, Santa Cruz, CA); anti-E2F1, anti-p63, anti-ATR, anti-p-ATR, anti-CHK1, anti-p-CHK1, anti-CHK2, anti-p-CHK2, anti-RAD51, anti-Mre11, anti-NBS1, anti-BRCA1, and anti-BRCA2 (Cell Signaling, Danvers, MA); anti-p73 (Abcam, Cambridge, MA); anti-p53 (Millipore, Burlington, MA); anti-p-TopBP1 (Abgent, San Diego, CA). AKT inhibitors MK2206 (2μM) and LY294002 (25μM) were purchased from SelleckChem (Houston, TX). Cell lysates were processed and assayed by western blot analysis as previously described 60 (link). Briefly, J2 feeders were firstly removed by Versene (PBS containing 0.5 mM EDTA) treatment and keratinocytes were collected and lysed in RIPA lysis buffer on ice for 30 minutes. The samples were then electrophoresed on SDS-page gels and transferred to PVDF membranes. At last the membranes were developed using ECL prime or ECL reagents (Amersham, Pittsburgh, PA) and chemiluminescence signals were detected using Eastman Kodak x-ray films.
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