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Ripa buffer

Manufactured by MedChemExpress
Sourced in United States

RIPA buffer is a commonly used lysis buffer for the extraction and solubilization of proteins from cells and tissues. It is a detergent-based buffer that helps to disrupt cell membranes and organelles, allowing the release of intracellular proteins. The buffer contains a combination of detergents, salts, and other components that help to maintain the solubility and stability of the extracted proteins.

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6 protocols using ripa buffer

1

Comprehensive Protein Expression Analysis

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Cells were lysed in 100 μl RIPA buffer (MedChemExpress). Proteins were transferred from SDS‒PAGE gels to Immobilon-FLPVDF membranes, blocked, and then incubated with primary antibodies overnight at a 1:1000 dilution. Antibodies against CCR5, AKT, p-AKT, Sp1, CD44, EpCAM, c-Myc, LATS 1, YAP, and GTGF (Abcam) were used. Membranes were then incubated in secondary antibodies, washed, and exposed on a chemiluminescence imaging system (Beijing Sage Creation Science) with ECL (Thermo Fisher Scientific). Western blotting was repeated three times for each band (see Additional file 1).
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2

Western Blot Analysis of Apoptosis Markers

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DA-treated cells were collected and lysed with ice-cold RIPA buffer (MedChemExpress), and a phosphatase inhibitor (Sigma-Aldrich) was added to prevent the degradation of phosphorylated proteins. Forty micrograms of total protein was subsequently separated by SDS‒PAGE and hybridized with the following antibodies after being transferred to PVDF membranes (Merck Millipore) and blocked with blocking buffer (Visual Protein). The primary antibodies were diluted 1:100 and included anti-GAPDH (Abcam, cat. no. ab9484), anti-Bax (Biolegend, cat. no. 633602), anti-Bcl-2 (Cell Signaling, cat. no. 2870s), anti-cleaved-PARP (Cell Signaling, cat. no. 9541s), anti-pPI3K (Cell Signaling, cat. no. 13857s), anti-PI3K (Santa Cruz, cat. no. sc-136208), anti-AKT (Sigma-Aldrich, cat. no. 05-1003), and anti-pAKT (Santa Cruz, cat. no. sc-7985); then, a 1:2,000 dilution of horseradish peroxidase-conjugated secondary antibodies (cat. no. 111-035-003, Jackson ImmunoResearch Laboratories, Inc.) was added and incubated with enhanced chemiluminescence (GE Healthcare Life Sciences) in a Hansor Luminescence Image system (Hansor).
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3

Western Blot Protein Quantification Protocol

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HASMCs and tissue sample proteins were extracted using RIPA buffer containing protease inhibitors (MedChemExpress, NJ, USA). The protein concentration was measured using BCA Protein Assay Reagent (Thermo Fisher Scientific). Lysates were denatured by boiling with SDS-PAGE Buffer loading buffer (Reducing, 5×) (CWBIO, Beijing, China). The proteins and prestained protein ladder (Thermo Fisher Scientific) were resolved on 10% SDS-PAGE gels and transferred to methanol-activated polyvinylidene fluoride membranes (Millipore, MA, USA). Membranes were blocked with 5% nonfat dry milk for regular antibodies, and incubated with primary antibodies overnight at 4 °C. The next day. the membranes were incubated with HRP-conjugated secondary antibody (Jackson ImmunoResearch Laboratories) for 1 h at room temperature. Detection was performed with Immobilon ECL substrate (Millipore), and the blots were imaged with a ChemiDoc Touch Imaging System (Bio-Rad). Protein expression was quantified using Image Lab 3.0 (Bio-Rad); target protein expression was normalized to that of GAPDH or β-actin in each sample and is expressed as a percentage of the control. The primary antibodies used in the experiments are shown in Table S2.
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4

Chromatin Immunoprecipitation Assay

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RBLs were collected as previously described [30 (link)]. Proteins were crosslinked to DNA by adding 270 µL of 37% formaldehyde to 10 mL culture medium (final concentration, 1%). After 10-min incubations at 37 °C, reactions were quenched by adding 0.125 M glycine for 5 min at room temperature. After washing with ice-cold PBS twice, fixed cells were lysed with 1 mL RIPA buffer (MedChem Express, Monmouth Junction, NJ) on ice for 10 min. After centrifugation, nuclei were sonicated (30% amplitude, 20 sets of 15-s bursts) for four rounds. Debris was removed by centrifugation at 13,000 rpm at 4 °C for 10 min; supernatants were transferred to new tubes. Lysates were precleared with protein A/G beads before being incubated with c-Fos antibodies (Cell Signaling Technology, Danvers, MA) or IgG (Santa Cruz, CA) at 4 °C overnight with rotation. The immunocomplex was washed (once each) in low salt, high salt, and LiCl solutions and washed twice in TE buffer. Bead-bound immunocomplexes were eluted with 200 µL elution buffer. To reverse histone-DNA crosslinks, samples were combined with 5 M NaCl and heated at 65 °C for 4 h. DNA product was purified in a spin column system (Omega Bio-Tek, Norcross, GA).
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5

Western Blot Analysis of Hippocampus and HT22 Cells

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Hippocampus or HT22 cells were homogenized in radioimmunoprecipitation assay (RIPA) buffer (MedChemExpress, USA) containing complete protease inhibitor cocktail and phosphatase inhibitor cocktail I and II (MedChemExpress, USA). Western blotting was performed as previously described (Peng et al. 2021 (link)). The involved primary antibodies were listed in Additional file 1: Table S1.
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6

ChIP-seq Protocol for c-Fos Binding

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RBLs were collected as previously described [30] . Proteins were crosslinked to DNA by adding 270 µl of 37% formaldehyde to 10 ml culture medium ( nal concentration, 1%). After 10-min incubations at 37°C, reactions were quenched by adding 0.125 M glycine for 5 min at room temperature. After washing with ice-cold PBS twice, xed cells were lysed with 1 ml RIPA buffer (MedChem Express, Monmouth Junction, NJ) on ice for 10 min. After centrifugation, nuclei were sonicated (30% amplitude, 20 sets of 15-s bursts) for four rounds. Debris was removed by centrifugation at 13,000 rpm at 4°C for 10 min; supernatants were transferred to new tubes. Lysates were precleared with protein A/G beads before being incubated with c-Fos antibodies (Cell Signaling Technology, Danvers, MA) or IgG (Santa Cruz, CA) at 4°C overnight with rotation. The immunocomplex was washed (once each) in low salt, high salt, and LiCl solutions and washed twice in TE buffer. Bead-bound immunocomplexes were eluted with 200 µl elution buffer. To reverse histone-DNA crosslinks, samples were combined with 5 M NaCl and heated at 65°C for 4 h. DNA product was puri ed in a spin column system (Omega Bio-Tek, Norcross, GA).
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