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9 protocols using p h2ax

1

Curcumin-induced Apoptosis in Cancer Cells

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Curcumin, CCK-8 kit, DMSO, and N-acetyl cysteine were purchased from Sigma Chemical Co (St. Louis, MO, United States) (Caspase-9, caspase-3,cleaved caspase-3,PARP,XIAP,p-Akt,Akt,GSK3,P-GSK3,FOXO1,P-FOXO1,GAPDH,cIap1,cIap2, Bcl-2, Bcl-xl, caspase 8, and cleaved caspase-8 antibodies were obtained from Cell Signaling Technologies (Beverly, MA, United States). Bax, p-H2AX, and cytochrome c antibodies and cisplatin were procured from Santa Cruz Biotechnology, Inc. (Santa Cruz, CA, United States). Annexin V fluorescein isothiocyanate (FITC), Propidium Iodide (PI), and p-H2AX (pS139) antibodies were purchased from BD Biosciences (San Jose, CA). z-VAD-FMK was obtained from Calbiochem (San Diego, CA, United States). CellROX Green was obtained from Invitrogen (MA, United States). Curcumin was dissolved in DMSO and further diluted in the cell culture media for the treatment of cells, so that the final concentration of DMSO in wells is 0.1% at the highest concentration of Curcumin used in the study. Viability assays showed that 0.1% DMSO is non-toxic to the cells (data not shown).
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2

Quantifying Telomeric DNA Enrichment

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Chromatin immunoprecipitation (ChIP) was used to determine the amount of p-H2A.X (Santa Cruz Biotechnology, Inc.) localized to telomeres. ChIPs were performed as previously described (Morgan and others 2013 (link)), and analyzed via qPCR for telomere content as described by Cawthon (Cawthon 2009 (link)). Final values were expressed as the ratio of background corrected starting quantity (SQ) of telomeric DNA enriched by ChIP to telomeric DNA SQ in INPUT fraction. INPUTs represented 50% of telomeric DNA present in corresponding ChIP and were used to control for tissue concentration in samples with the calculation: (γ-H2 SQ - background SQ)/INPUT SQ = final value.
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3

Protein expression analysis by Western blot

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RIPA buffer augmented with protease and phosphatase inhibitors was administered for cell lysis (14 (link)). The proteins were separated by SDS-PAGE and then transferred to nitrocellulose blotting membranes (GE Healthcare Life Science, Germany). The spots were examined with antibodies against PARP (Cell Signaling Technology, CST, Danvers, MA, USA, 9542), vinculin (Abcam, Cambridge, MA, USA, ab129002), GAPDH (HUABIO, Woburn, MA, USA, M1310-2), ATM (Santa Cruz Biotechnology, Dallas, TX, USA, sc135663), p-ATM (Ser1981) (CST, 5883), H2AX (Santa Cruz Biotechnology, sc517336), p-H2AX (Ser139) (Santa Cruz Biotechnology, sc517348), CHK1 (Santa Cruz Biotechnology, sc8408), p-CHK1 (Ser345) (CST, 2348), P53 (Santa Cruz Biotechnology, sc126), p-P53 (Ser15) (CST, 9286), ATR (Santa Cruz Biotechnology, sc515173), p-ATR (Ser428) (CST, 2853), FANCD2 (Santa Cruz Biotechnology, sc20022), and RAD51 (Santa Cruz Biotechnology, sc398587).
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4

Western Blot Analysis of DNA Damage Markers

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The proteins separated by SDS-PAGE were transferred to PVDF membranes (Millipore Corp., Bedford, MA, USA) and the membranes were incubated with blocking liquid (5% non-fat dry milk) for 1 h, and then probed with primary antibodies for 1 h at room temperature. After washing with PBST, the membranes were incubated with secondary antibodies labelled with horseradish peroxidase (Cell Signaling Technologies) for 1 h at room temperature, and the membranes washed with PBST. After hybridization reaction, ECL Western Blot chemiluminescence reagent kit (Amersham Biosciences, Uppsala, Sweden) was applied for developing. The primary antibodies that were used included: PML (dilution, 1:1,000; mouse no. sc-966;Santa Cruz Biotechnology), β-Actin (dilution, 1:1,000; Rabbit.no. 4970S), p-H2AX (dilution, 1:1,000; Rabbit.no. 9718), p-CHK1 (dilution, 1:1,000; Rabbit no. 2348), cleaved caspase-3 (dilution, 1:1,000; Rabbit. no. 9661) (Cell Signaling Technologies).
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5

Western Blot Analysis of Cell Signaling

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Western blot analysis was performed with p21, p53, p-ser15 p53, p-H2AX, PARP (Santa Cruz), HdmX (Bethyl) and β-actin antibodies (Sigma). Cells were treated as indicated and washed in PBS. Cells were centrifuged and lysed with a Triton containing lysis buffer. Protein lysates (50 μg per lane) were electrophoresed on SDS-polyacrylamide gels and then transferred to PVDF membranes (Millipore) using a wet transfer apparatus (Bio-Rad). The membranes were blocked, incubated with the indicated primary antibodies at 4°C overnight, and then the appropriate HRP conjugated secondary antibody. Protein bands were visualized by autoradiography after incubation with enhanced chemiluminescence reagent (Millipore).
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6

Pevonedistat Modulates Cell Signaling

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The CLBL-1 cells were treated with DMSO control or pevonedistat (0.1–0.7 μM) for 1, 4, 6, 12 or 24 hours. Cell lysates were made according to the previously published methods16 (link) and were described in detail in the supplementary data. For detection of p-IκBα, CLBL-1 cells were stimulated with 10 ng/mL of human recombinant (rh) TNFα (PeproTech, Rocky Hill, NJ) for 5 minutes before preparing cell lysates in both pevonedistat and DMSO-treated groups. For detection of cleaved Caspase 3, and phosphorylated Histone 2AX, cells were not stimulated with any cytokine. The following commercial antibodies were used in western blots: p-IκBα (1:1000, Cell Signalling Technology, Danvers, MA, 14D4), cleaved caspase-3 (1:1000, Cell Signalling Technology, Danvers, MA, 5A1E) and p-H2AX (1:1000, Santa Cruz Biotechnology, Dallas, TX, sc-517348), and β-actin (1:5000, Sigma-Aldrich, AC-15).
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7

Investigating Cell Signaling Pathways in Apoptosis

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Dimethylsulfoxide (DMSO), 3-(4,5-dimethylthylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT), and all other chemicals were purchased form Sigma-Aldrich (St. Louis, MO, USA). Antibodies against PARP, caspase-3, caspase-8, caspase-9, Bak, IRE1α, PERK, TNFR2, CDK6, p-cdc2, p-Rb (ser795), p-ATM, p-ATR, p-Chk1, and p-Chk2 were purchased from Cell Signaling Technologies (Beverly, MA, USA). Antibodies of Bcl-2, LC3, NF-κB, p-H2AX, ATF6, and CDK4 were purchased from Santa Cruz Biotechnology (Santa Cruz, CA, USA). Antibodies of TNFR1, RIPK1, RIPK3, and MLKL were purchased from ABclonal (ABclonal, Wuhan, China). Antibodies of Actin and p62/SQSTM1 were purchased from Sigma (Sigma, CA, USA). Anti-mouse and rabbit IgG peroxidase-conjugated secondary antibody were purchased from Pierce (Rockford, IL, USA). Hybond ECL transfer membrane and ECL Western blotting detection kits were purchased from Ameisham Life Sciences (Amersham, Buckinghamshire, UK). Rhodamine 123 and the carboxy derivative of fluorescein (carboxy-H2DCFDA) were purchased from Molecular Probes and Invitrogen detection technologies (Carlsbad, CA, USA).
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8

Cell Viability Assay and Apoptosis Analysis

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Cell Counting Kit-8(CCK-8), methanol, dimethylsulfoxide (DMSO),thiostrepton were obtained from Sigma-Aldrich (St. Louis, MO, USA). Antibodies against FOXM1, Aurora Kinase A,B,CDK-6,-4, PARP, cleaved caspase-8,-3, and β-actin were obtained from Cell Signaling Technologies (Beverly, MA, USA).BUB1B, HSP60, p-H2AX, Bax, Bcl2 were obtained from Santa Cruz Biotechnology, Inc., (CA, USA). AllPrep DNA/RNA Mini Kit was purchased from Qiagen (Hilden, Germany). Live and Dead assay kit, RPMI 1640 medium, fetal bovine serum (FBS), penicillin and streptomycin were obtained from Life Technologies, Inc. (Carlsbad, CA).
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9

Immunohistochemical Analysis of Cellular Markers

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Formalin-fixed, paraffin-embedded tissues were cut into 5-μm sections for IHC analysis. Antibodies specific for IL-6, p-H2AX, Ki-67, and active caspase 3 were obtained from Santa Cruz Biotechnology, Inc. (Santa Cruz, CA, USA), Research & Diagnostics Systems, Inc. (Minneapolis, MN, USA), Cell Signaling Technology (Danvers, MA, USA), and Chemicon (Temecula, CA, USA). The sections were incubated overnight at 4 °C with antibodies against the target proteins. Frozen tissue specimens were cut into 5–8 μm cryostat sections, warmed to room temperature, fixed for 10 min in cold acetone (−20 °C), and incubated for 20 min in PBS containing 10% goat serum. The sections were incubated overnight at 4 °C with antibodies against IL-6, CD11b, and CD3, washed three times with PBS, and incubated for 1 h with fluorescein or Texas Red-conjugated secondary antibodies. The positive staining signals were assessed by microscope from ten random fields and semiquantitated by MetaMorph software (version 7.7, Molecular Devices, Sunnyvale, CA, USA)
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