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8 protocols using enhanced bca protein assay reagent

1

Western Blotting Protein Analysis Protocol

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Western analyses were performed as described previously44 (link). Briefly, whole cell lysates were extracted using radioimmunoprecipitation assay (RIPA) buffer containing protease inhibitor cocktail and phosphatase inhibitor cocktail (Roche, Mannheim, Germany). The concentration of proteins was determined using enhanced BCA protein assay reagent (Beyotime, Haimen, China) and protein samples were separated by 10–12% SDS-PAGE. Protein was transferred to nitrocellulose and western blot analysis performed. Detection was performed by electro chemical luminescence (ECL).
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2

Mitochondrial Profiling and Protein Analysis

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Mitochondrial and cytosolic fractions were isolated using the Mitochondria Isolation Kit for Cultured Cells (Pierce, 89874) according to the manufacturer's protocols. For total protein extraction, cells were lysed in RIPA buffer (Beyotime, China, P0013B). Total protein concentration was detected using the Enhanced BCA Protein Assay Reagent (Beyotime, China, P0010), and equal amounts of each sample were boiled with 1× SDS-PAGE sample buffer for 10 min, separated on 8% - 14% SDS-PAGE gels, and transferred to PVDF membranes (Bio-Rad, 162-0177). After blocking with 5% nonfat dried milk, the blots were incubated with the appropriate antibodies and bands were visualized using the enhanced chemiluminescence kit (Bio-Rad, 170-5061). For immunoprecipitation, equal quantities of proteins were incubated with PINK1 antibody at 4°C for 12 h followed by incubation with protein A/G agarose beads (Santa Cruz Biotechnology, sc-2003) for 3 h, after which immune complexes were collected by centrifugation. After washing 5 times in phosphate-buffered saline (PBS), samples were subjected to western blot analysis. Densitometric analysis of the blots was performed using Quantity One software (Bio-Rad, Germany).
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3

HMF-Mediated Lipid Depletion Impact

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Cells were plated in 96-well plates at a density of 2.5 × 104 cells/well. After 18 h culture, cells were treated with or without 5, 10, or 20 μmol/L HMF with lipid depletion (LD) medium contained a 1:1 mixture of Ham's F-12 medium (GIBCO, USA) and DMEM supplemented with 100 U/mL penicillin, 100 μg/mL streptomycin sulfate, 5% lipoprotein-deficient serum (Kalen Biomedical, USA), 10 μmol/L compactin (Aladdin), and 50 μmol/L sodium mevalonate (Sigma, USA) for another 18 h. The luciferase activity was measured using luciferase assay kit (Promega, USA) and normalized by the concentration of total proteins using Enhanced BCA Protein Assay Reagent (Beyotime, China).
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Protein Expression Analysis by Western Blot

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Cells and tissues were lysed with RIPA lysis buffer (P0013B; Beyotime Biotechnology) and detected with Enhanced BCA Protein Assay Reagent (P0010; Beyotime Biotechnology). Each lysate was separated on 10%‐12% SDS‐PAGE gels and then transferred onto PVDF membranes (162‐0177; Bio‐Rad). The membranes were blocked with 5% nonfat dried milk for 2 hours and subsequently incubated with primary antibodies overnight at 4°C. After washing three times with TBST, the membranes were incubated with a secondary antibody for 2 hours, and then the bands were visualized with the enhanced chemiluminescence kit (170‐5061; Bio‐Rad). The densitometric analysis was measured by Quantity One software (Bio‐Rad).
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5

Quantitative Western Blot Analysis

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Brain tissue or cells were lysed with lysis buffer and subjected to a 15,000 g spin to remove nuclei and debris. Total protein concentrations were determined using the Enhanced BCA Protein Assay Reagent (Beyotime). Equal amounts (30 μg protein) were loaded onto SDS‐PAGE gels. Proteins were transferred onto polyvinylidene flouride (PVDF) membranes. Membranes were blocked with 5% dry milk solution for 1 hr and then incubated with primary antibodies overnight at 4°C. Membranes were washed with TBST, and protein bands were visualized using horseradish peroxidase‐conjugated species‐specific secondary antibodies. GAPDH was used as loading control. Images were captured, and band intensities were quantified using an Odyssey Image Station (LI‐COR).
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6

Western Blot Quantification Protocol

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Cells were lysed with 1% RIPA Lysis Buffer (Beyotime, China). Cell lysate was subjected to a 13,000 rpm spin to remove nuclei and debris. Cleared lysate was used for the indicated biochemical assay. Protein concentrations were determined using the Enhanced BCA Protein Assay Reagent (Beyotime). Equal amounts of cell lysate were loaded onto SDS-PAGE gels and then transferred to PVDF membranes. Membranes were blocked with 5% fat-free dry milk in Tris buffered saline (TBS), containing 0.05% Tween-20, and incubated with primary antibodies. Protein bands were detected by horseradish peroxidase-conjugated species-specific secondary antibodies. Actin was used as loading control. Images were captured using an Odyssey Image Station (LI-COR), and band intensities were quantified using Scion Image.
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7

Western Blot Analysis of Protein Samples

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Tissues and cells were lysed with RIPA lysis buffer (Beyotime) supplemented with protease inhibitors and phosphatases inhibitors. Total protein concentration was detected using Enhanced BCA Protein Assay Reagent (Beyotime). Denatured proteins (25 μg) were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and then transfected to PVDF membranes (Keygen Biotech, KGP113K). After blocking with 5% nonfat milk for 1 h, the membranes were incubated overnight at 4°C with the indicated primary antibodies, followed by incubation with a goat anti-rabbit/mouse antibody for 1 h at room temperature. Finally, the protein bands were visualized using the enhanced chemiluminescent kit (Yeasen), and the levels of proteins were normalized to the GAPDH expression.
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8

Western Blot Protein Extraction and Analysis

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Cellular samples were lysed with RIPA buffer containing a protease inhibitor cocktail as previously described. Nuclear and cytoplasmic proteins were extracted using the NE-PER™ Nuclear and Cytoplasmic Extraction Reagents (Thermo Fisher, Shanghai, China) according to manufacturer’s protocol. The protein concentration was determined using Enhanced BCA Protein Assay Reagent (Beyotime, Jiangsu, China). Equal quantities of proteins from each sample were separated by 10% SDS-PAGE, and then transferred to PVDF membranes (Bio-Rad, 162–0177). After blocking with 5% fat-free dry milk, the membranes were incubated with specific primary antibodies overnight at 4 °C and corresponding HRP-conjugated secondary antibodies for 2 h at room temperature. Protein bands were visualized with an enhanced chemiluminescence system (Perkin-Elmer Life Sciences, Boston, USA). Band intensities were quantified using ImageJ software, and β-actin, LaminB1 or GAPDH was used as internal reference.
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