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62 protocols using bcl2 associated x (bax)

1

Apoptosis Protein Expression in Duodenal Ulcers

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Expression levels of apoptosis-related proteins including Bcl-2 (Transduction, Bluegrass-Lexington, KY), Bax (Chemicon, Temecula, CA), caspase 3 (CPP32, Upstate Biotechnology, Lake Placid, NY), PARP (Cell Signaling Technology, Inc., Danvers, MA), and β-actin (Sigma, Saint Louis, MI) were analyzed using Western blotting in the duodenal epithelium from the ulcers of rats in the different groups [24] (link).
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2

Phillyrin Modulation of Apoptotic Signaling

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Western blot was performed as previously reported [25 (link)]. In brief, primary neuron cells were incubated with 20, 40, and 80 μM phillyrin for 2 h followed by 30 min treatment with 100 μM H2O2. Total proteins were extracted from these cells and transferred onto cellulose acetate membranes after separated by SDS-PAGE. After blocking with PBS solution for 1 h, the membranes were incubated with Bax (1:1000, Chemicon, Temecula, CA, USA), Bcl-2 (1:1000), and procaspase-3 (1:1000) primary antibodies from Chemicon, Temecula, CA, USA; pAkt-1 (1:1000), Akt-1 (1:1000), mTOR (1:1000), and LC3-II (1:1000) from Cell Signaling Technology, Danvers, MA, USA; and beclin-1 (1:1000) and β-actin (1:1000) primary antibodies from Sigma-Aldrich, St. Louis, MO, USA, at 4°C for overnight. Then, secondary antibody was added for 1 h at 25°C. ECL chemiluminescence solution was used to visualize protein bands and analyzed using Image J software.
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3

Immunoblot Analysis of Apoptosis Markers

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Twenty micrograms of total protein was separated by 12.5% sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS-PAGE) and transferred to a polyvinylidene fluoride (PVDF) membrane (Millipore, Billerica, MA, USA) for immunoblot analysis using the following primary antibodies: GRP78 (1:1000), GADD153 (1:1000), Bax (1:2000), Bcl-2 (1:1000), cytochrome c (1:500), caspase-9 (1:1000), caspase-3 (1:1000), and GAPDH (1:1000). The primary antibodies were purchased from Cell Signaling Technology (Danvers, MA, USA), except for the Bcl-2 and GAPDH antibodies, which were purchased from Santa Cruz Biotechnology (Dallas, TX, USA). The PVDF membranes were incubated overnight at 4 °C with the primary antibodies, and subsequently incubated for 1 h at room temperature with a horseradish peroxidase (HRP)-conjugated secondary antibody, goat anti-rabbit immunoglobulin G (IgG) or horse anti-mouse IgG (Cell Signaling Technologies, Danvers, MA, USA). The target protein bands were detected using a chemiluminescence image analyzer (CAS-400SM, Davinch-K, Seoul, Korea) and quantified using the ImageJ software (National Institutes of Health, Bethesda, MD, USA). The protein levels were normalized to the GAPDH protein levels.
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4

Immunoblotting of Mitochondrial Proteins

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Immunoblotting was performed on whole cell lysates, cytoplasmic (for cytochrome c) or mitochondrial fractions (see above). To obtain whole cell lysates, HAEC or lung homogenates were lysed in RIPA buffer and centrifuged at 6000 × g for 10 min at 4°C to separate insoluble components. Protein concentration was measured via DC Assay according to manufacturer protocol (Bio-Rad, Hercules, CA). Lysates were mixed with 5X sample buffer, resolved by SDS-PAGE electrophoresis and transferred to PVDF membranes. After blocking in 5% dry milk in TBS with 0.05% Tween 20 for 60 min, the membranes were incubated in primary antibody against MCU (1:500, HPA016480, Sigma), COXIV (1:1000, cat. 4850, Cell Signaling), cytochrome c (cytoplasmic fraction, 1:500, cat. 4280, Cell Signaling), ZO-1 (1:500, cat. AB2272, Millipore), Bax (1:500, cat. Sc-70407, Santa Cruz), Bcl-2 (1:500, cat. sc492, Santa Cruz) or GAPDH (1:1000, cat. 2118, Cell Signaling) overnight, followed by anti-rabbit (1:2000, cat. sc-2004, Bio-Rad) or anti-mouse (1:2000, cat. 7076, Cell Signaling) IgG secondary antibody for 60 min at room temperature. Proteins were visualized with the enhanced chemiluminescence detection method (Licor, Lincoln, NE). Densitometric analysis was assessed by ImageStudioLite software (Licor). After normalization, data were calculated as fold change.
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5

Western Blot Analysis of THP-1 Macrophages

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THP-1 derived macrophages were homogenized in 100 μl of protein extraction reagent (Thermo Scientific) and protease inhibitor (Panomics). Protein concentration was determined by Pierce BCA Protein Assay Kit (Thermo Scientific). 20 μg protein was loaded per lane and separated by NuPAGE Novex Bis-Tris 4–12 % mini gel electrophoresis (Invitrogen) in the Novex Xcell-II apparatus for 120 min at 100 V, and transferred to Immbilon-PVDF transfer membranes (Millipore) for immunoblotting. Proteins were visualized by enhanced chemiluminescence according to the manufacturer's instruction. Nonspecific binding was blocked with 5% nonfat milk for 1 h at the room temperature. The antibodies to IKKα, IKKβ, IKKγ, IκBα, p-IκBα and β-actin were purchased from Genetex. The antibodies to phosphorylated-IKKα (phospho Ser176/Ser180), phosphorylated IKKβ (phospho Ser177/Ser181), phosphorylated IKKγ (Ser85) were purchased from Biocompare. The antibody to IκBβ was purchased from Abcam. The antibody to p-IκBβ was purchased from Cell signaling. The antibodies to Bcl-2 and FasL were purchased from BD Biosciences (Pharmingen). The antibodies to p50, p52, Rel A, Rel B and Lamin B were purchased from Santa Cruz. The antibody to p-53 was purchased from Sigma. The antibody to Noxa was purchased from Calbiocam. The antibodies to ABCA1, PUMA, Bax, activated caspase3 and GAPDH were purchased from Millipore.
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6

Protein Extraction and Analysis

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The cells were collected and lysed using RIPA buffer (Beyotime, Shanghai, China) with a protease inhibitor cocktail (APExBIO, TX, USA) on ice for 20 min. Next, the suspension was centrifuged at 14,000 rpm at 4 °C for 20 min. The supernatant was transferred into new microcentrifuge tubes (Eppendorf, Hamburg, Germany) and the protein concentration was detected using a BCA protein assay kit (Thermo Fisher scientific, CA, USA). Twenty µg of each sample was used for SDS-PAGE. The following primary antibodies were used: E-cadherin (Abcam, Cambridge, MA, USA, ab194982) Vimentin (Abcam, ab193555), N-cadherin (Abcam, ab202030), cyclinD1 (Millipore, Billerica, MA, USA, ABE52), cleaved-casepase3 (Millipore, PC679), bax (Millipore, MAB4601), bcl-2 (Abcam, ab185002), and c-myc (Abcam, ab190026).
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7

Protein Expression Analysis of Lung Tissue

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Following previously described methods [6 (link),7 (link),12 (link)], Western analysis was performed on lung tissue to determine protein levels of alveolar epithelial (SP-C and CCTα) and alveolar mesenchymal (PPAR-γ) differentiation and injury repair (LEF-1 and Fibronectin) markers. Primary antibodies (all from Santa Cruz Biotechnology, Dallas, TX, USA) used included: PPARγ (1:500), SP-C (1:250), CCT-α (1:200), LEF1 (1:200), Fibronectin (1:250), BAX (1:500), Bcl-2 (1:200), and GAPDH (1:10,000), which was from Millipore, Billerica, MA, USA.
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8

Whole cell lysate immunoblotting protocol

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Whole cell lysates were prepared using RIPA Buffer (Sigma) supplemented with protease and phosphatase inhibitor cocktail (Roche). Primary antibodies [cl-caspase-3 (04–439), Bcl-2 (05–729), Bax (MAB4601) Millipore; p53 (9282), Mcl-1 (5453), GAPDH (14C10) CST; p21 (sc-6246) SCBT; MDM2 (MA1–113) Invitrogen; Bcl-xL (ab98143) Abcam; aurora-A (610938), aurora-B (611082) BD Biosciences; β-actin (A5441) Sigma]. Secondary detection performed using anti-rabbit or anti-mouse IgG Vectastain ABC kit (Vector Laboratories) and detected with Lightning-ECL kit (PerkinElmer).
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9

Histopathological and Apoptosis Analysis

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At the moment of sacrificing, the left kidney was taken for the morphological analysis. Renal tissue was prepared as described previously [8] (link), and stained by hematoxiline eosine (H&E) and periodic acid-Schiff (PAS). Intensity and spread of tubular necrosis, number of intra-luminal cast formations, swelling and vacuolization of cells, loss of luminal membrane or brush borders, tubular dilatation, interstitial oedema and separation of cells from tubular basal membrane were semi-quantitatively evaluated as described previously [8] (link). The level of each manifestation was graded with 1 for low, 2 for moderate, 3 for high, and 0 for the lack of manifestation. The sum of these changes represented the histopathological score.
For investigation of Bax and Bcl-2 expression paraffin, sections were treated by microwave for 20 min at 400 W in citrate buffer (pH 6.0) after deparaffinization and dehydration. After antigen retrieval, samples were incubated with Bax (dilution 1∶250, Millipore, Billerica, MA) and Bcl-2 (dilution 1∶200, Millipore, Billerica, MA) antibodies for 1 hour at room temperature. The EnVisionTM staining method (DAKO) was performed, followed by counterstaining with hemalaun (Merck). Negative controls were performed by omitting the first antibody. The slides were evaluated using the light microscope BX53 (Olympus).
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10

Protein Expression Analysis via SDS-PAGE

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The extracted samples were subjected to SDS-PAGE by using specific antibody for Bcl2 (1:1000), Bax (1:1000), Caspase3 (1:1000), GAPDH (1:1000) (Millipore, Germany). The bands were detected with an EZ-ECL kit (BI Biological Industries, 20-500-120) in Imagequant LAS4000 mini (GE Healthcare) after incubation with secondary antibodies. Plus Image-Pro 6.0 software was used for image analysis. GAPDH was used as control for normalization40 (link).
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