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Ripa extraction buffer

Manufactured by Thermo Fisher Scientific
Sourced in United States

RIPA extraction buffer is a detergent-based lysis buffer used for the extraction of proteins from cells and tissues. It is designed to solubilize a wide range of proteins while preserving their native conformation and biological activity. The buffer contains a balanced mixture of ionic and non-ionic detergents, as well as other components that aid in the lysis and extraction process.

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9 protocols using ripa extraction buffer

1

Evaluating S. atropatana Extracts on MCF-7 Cells

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MCF-7 cells were grown in 6-well plates and treated with dichloromethane extracts of S. atropatana and DMSO, as a control for 24h. After treatment, cells were lysed in RIPA Extraction Buffer (Thermo Scientific, Canada) and equal amounts of proteins (100 μg) from cell lysates were subjected to sodium dodecyl sulfate– polyacrylamide gel electrophoresis (SDS- PAGE). Subsequently, blotting onto polyvinyl-difluoride (PVDF) membrane (Roche Diagnostics GmbH, Germany) was performed in 150 mA for one hour. The membrane was subsequently blocked with 4% skim milk, washed and incubated with specific primary antibodies of a mouse anti-PARP monoclonal antibody and anti-β-actin as a normalizing control (Roche Diagnostics GmbH, Germany) for overnight. Then the membrane was probed with horseradish peroxidase-conjugated secondary antibody. Protein detection was carried out by exposing the membrane to ECL western blotting detection system (Amersham Phamacia Biotech Inc, USA).
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2

Immunoprecipitation and Western Blot Analysis

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Confluent layers of HMVECs were treated according to specific experiment designs. At the conclusion of treatment, the cells were washed with PBS thrice and lysed with RIPA extraction buffer (Thermo Fisher, USA) containing a cocktail of protease/phosphatase inhibitors. Samples were subsequently handled in the immunoprecipitation assay buffer (20 mM HEPES buffer pH 7.5, 150 mM NaCl, 0.1% Triton X-100, and 10% glycerol), where relevant immunoprecipitant antibody was incubated with the sample for 90 min at suitable dilution, with gentle mixing. The protein A/G PLUS–agarose beads (Santa Cruz Biotechnology) were subsequently added. Samples were centrifuged and washed with immunoprecipitation assay buffer for a total of four times. The final spun-down pellet was resuspended in SDS loading buffer and proceeded to be subjected to immunoblotting/western blot assays according to the method described above.
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3

Measurement of Superoxide Dismutase Activity

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Protein from healthy-MSCs or CKD-MSCs was extracted using a RIPA extraction buffer (Thermo Fisher Scientific). SOD activity was measured using a SOD activity kit (Enzo, Basel, Switzerland). Briefly, 40 µg protein was added to each well. A master mix (150 µL) containing WST-1 reagent and xanthine oxidase was also added to each well. In this colorimetric assay, superoxide ions are generated from the xanthine oxidase catalyzed conversion of xanthine and oxygen to uric acid and hydrogen peroxide (H2O2). The superoxide anion then converts WST-1 to the color WST-1 formazan product. Following the addition of the xanthine oxidase solution (25 µL/well), the absorbance was measured at 450 nm every minute for 15 min using a microplate reader (BMG Labtech, Ortenberg, Germany). SOD activity was calculated following the manufacturer’s instructions.
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4

Western Blot Analysis of Protein Expression

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Tissue/cells were lysed in RIPA extraction buffer (ThermoFisher Scientific) supplemented with 1X Protease and Phosphatase Inhibitor Cocktail (ThermoFisher Scientific). Protein concentration was measured using Pierce BCA-kit (ThermoFisher Scientific) and protein samples were separated by SDS-PAGE on a 4–20% TRIS-glycine gradient gel (ThermoFisher Scientific). Afterwards, the proteins were blotted onto a polyvinylidene fluoride membrane using iBlot system (Invitrogen). Target proteins were detected using specific antibodies and visualized with respective horseradish peroxidase (HRP) conjugated antibodies (Cell signaling, Danvers, MA, USA) and Clarity Western ECL substrate (Biorad, Hercules, CA, USA). Chemiluminescence was recorded by ChemiDoc Touch Imaging system (Biorad). After stripping the membranes using Restore Western Blot Stripping Buffer (ThermoFisher Scientific) for 20 min, membranes were reprobed with β-Actin antibody (Cell signaling) and further processed as described above. Densitometric analysis of protein bands was performed using Imagelab Software (version 5.2). Western blot images were cropped for easier presentation. Originals are visualized in the supplementary material.
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5

Western Blotting Protein Analysis

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All the primary antibodies applied are shown in Table S2. There were four main steps in Western blotting. First, protein extraction was performed. Cells or tissues were lysed with RIPA extraction buffer (Thermo, 89900) containing protease and phosphatase inhibitor cocktails, and the supernatant solution was quantified after centrifugation. Second, SDS‒PAGE separated proteins through electrophoresis, and then the protein was transferred to PVDF membranes (Millipore, IPVH00010, ISEQ00010). Third, the PVDF membranes were blocked with 5% bovine serum albumin (BSA) and incubated with antibodies according to the instructions. Finally, the bands were tested and analysed by ImageJ.
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6

Immunoblotting Quantification of RAP1B Protein

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Total proteins were extracted from cell cultures using RIPA extraction buffer (Thermo Scientific, Carlsbad, CA, USA) supplemented with protease and phosphatase inhibitors (Thermo Scientific, Carlsbad, CA, USA). The proteins were separated through SDS-PAGE (12.5%) and subsequently transferred to nitrocellulose membranes, which were blocked with 5% skimmed milk and incubated with the primary anti-RAP1B antibody (CST, Danvers, MA, USA) at a 1:1000 dilution overnight at 4 °C. After washing with TBS-T, the membranes were incubated with anti-Rabbit secondary antibody coupled to HRP (Invitrogen, Carlsbad, CA, USA) at a 1:2000 dilution. An antibody against GAPDH was used as an endogenous control. The membranes were reused and incubated with primary anti-GAPDH antibody at a 1:2000 dilution (Invitrogen, Carlsbad, CA, USA) overnight at 4 °C. Pierce ECL Western Blotting Substrate (Thermo Scientific, Carlsbad, CA, USA) was used for development.
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7

Osteoblast Differentiation Protein Analysis

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Primary cells were extracted from the flat bone of P3 Ddr1f/f-4OHT and OKOΔDdr1 mice and MC3T3-E1 cells were extracted with RIPA extraction buffer (89900, Thermo Fisher Scientific Inc., Waltham, MA, USA.) containing 1% proteinase inhibitor (78429, Thermo Fisher Scientific Inc., Waltham, MA, USA) and 1% phosphatase inhibitor (78426, Thermo Fisher Scientific Inc., Waltham, MA, USA). Western blot was performed with primary antibodies against DDR1 (ab22719, Abcam, Cambridge, MA, USA), collagen type I (ab34710, Abcam), collagen type X (ab58632, Abcam), GAPDH (MA5-15738, Thermo Fisher Scientific Inc.), ALP (ab95462, Abcam, Cambridge, MA, USA), Runx2 (ab23981, Abcam), BMP2 (ab14933, Abcam), Col-I (ab34710, Abcam), Osteocalcin (GTX13418, Gene Tex Inc., Irvine, CA, USA), phosphorylated 44/42 ERK1/2 (D11A8, Cell Signaling Inc., Danvers, MA, USA), ERK1/2 (137F5, Cell Signaling Inc.), phosphorylated p38 (Thr180/Tyr182) (ARG51580; Arigo biolaboratories, Hsinchu, TW), p38 (ARG55258; Arigo biolaboratories) and mouse and rabbit secondary antibodies (615005214 and 611005215; Jackson immune research; West Grove, PA, USA). Protein bands were detected by enhanced chemiluminescence analysis (ECL system; GE Healthcare, Piscataway, NJ, USA).
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8

Western Blot Analysis of Apoptosis Markers

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Protein was extracted from cells by using RIPA extraction buffer (Thermo Scientific) on ice for 30 min according to the manufacturer's instructions. The obtained supernatant was separated with a 10% SDS-PAGE gel and transferred to PVDF membranes. Then, the membrane was blocked with 15% milk for 1 h and incubated with primary antibodies against Bax (Cell Signaling Tech., 1 : 1000), caspase 3 (Cell Signaling Tech., 1 : 1000), and beta-actin (Protein Tech., 1 : 1000). After incubation with secondary antibody, protein signals were detected with a chemiluminescence kit (Thermo Fisher Scientific, Inc.). Pictures were captured with an automatic image scanning system (Gene, Co.).
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9

Stretching-Induced Fibrinogen Binding

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Cells were seeded on collagen-coated stretch chamber (Strex Cell, STB-CH-10) and incubated at 37 °C in a CO2 incubator until they reached 70~80% confluency. The chamber was washed three times with HBSS and then stretched uniaxially to 130% of its original length for 40 sec in the presence of 50 µg/mL FITC-fibrinogen. After washing, cells were lysed with RIPA extraction buffer (Thermo Fisher Scientific). FITC fluorescence and total protein concentration in the clarified lysates were measured using FluoroMax-4 spectrofluorometer (HORIBA Scientific) and BCA Colorimetric Assay kit (Thermo Fisher Scientific), respectively, and fluorescence intensities normalized to protein concentrations were calculated. Non-specific fibrinogen binding was measured by performing the stretch experiment in the presence of 10 µM eptifibatide. To measure αIIbβ3 TMD interaction under stretch condition, CHO cells were cultured and transfected with pcDNA3.1/3xFLAG-αIIb(TMD-tail)-TAP, pcDNA3.1/Tac-β3(TMD-tail), or their mutant constructs. After washing with DPBS, cells on the chamber were stretched as described above, lysed immediately after removal of DPBS, and used for pull-down experiment as described previously [18 (link)].
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