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7 protocols using anti il 6r

1

Gastric Biopsy Protein Extraction and Analysis

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The total protein was extracted from samples of gastric biopsies using RIPA buffer containing inhibitors (1 M NaF, Complete Protease Cocktail Inhibitor, and 0.1 M PMSF). The total extracted proteins were quantified using the NanoDrop 2000 spectrophotometer (Thermo Scientific®) using Bradford reagent and standard BSA proteins (5000201, Bio-Rad, USA). The proteins (25 μg) were separated in 12% SDS-PAGE, and transferred to a nitrocellulose membrane, and then blocked with 5% skimmed milk in 1× phosphate buffered saline and 0.1% Tween 20 (PBST), for 2 h at room temperature. Subsequently, the membranes were incubated overnight at 4°C, with primary antibodies: anti-α-tubulin antibody (5168, 1:5,000, Santa Cruz Biotechnology, USA); anti-IL-6 (93356, 1:500, Abcam, USA), and anti-IL-6R (128008, 1:3,000, Abcam). Then, the membranes were incubated individually for 1 h 30 min at room temperature with secondary antibodies: goat anti-rabbit IgG H&L (97051, 1:10,000, Abcam), used for IL-6 and IL-6R, and m-IgGk BP-HRP (1:5.000 Santa Cruz Biotechnology), used for tubulin. Finally, the membranes were washed in PBST, and revealed.
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2

Western Blot Analysis of IL-6R Protein

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To obtain the total proteins, RIPA lysis buffer added with PMSF was used at 4°C. The supernatant was obtained after cells were centrifuged at 9500 g/min for 5 minutes. Afterwards, BCA Protein Assay Kit (Beyotime, Shanghai, China) was carried out to measure protein concentration and the protein was boiled for degeneration. Then, the proteins were loaded on 10% SDS‐PAGE and transferred to PVDF membranes. We added the primary antibodies to the membranes for a whole night at 4°C. Primary antibodies, anti‐IL‐6R and anti‐GAPDH (1:1000, Abcam, Cambridge, UK), were used. After incubated with secondary antibodies for 2 hours, the membranes were exposed to the enhanced chemiluminescence reagent. Finally, the bands were evaluated utilizing ImageJ software.
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3

Protein Detection in Cell Lysis

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Cells were lysed in RIPA buffer. The proteins were detected with anti-IL-6 (Santa Cruz, Dallas, TX, USA, sc-7920), anti-IL-6R (Abcam, Cambridge, UK, ab128008), IGF1R (Sigma-Aldrich, St Louis, MO, USA, SAB1104892), anti-STAT3 (Santa Cruz, sc-482), anti-phoshpo-STAT3 (Cell Signaling, Danvers, MA, USA, 9145), anti-phoshpo-IGF1R (Cell Signaling, 2969), anti-beta-actin (Cell Signaling, 4970) or anti-glyceraldehyde 3-phosphate dehydrogenase (Protein Tech Group, Chicago, IL, USA, 10494-1-AP). Immunoreactivity was determined using the ECL method (Millipore, Boston, MA, USA) according to the manufacturer's instructions.
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4

Protein Expression Analysis in Neurons and Astrocytes

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Total protein extracted from primary neurons or astrocytes was used for western blotting. The membranes were incubated in primary antibodies including anti-IL6R (1:400, Abcam, USA), anti-STAT3 (1:800, ABZOOM, USA), anti-Bax (1:200, Sigma, USA), anti-Bcl-2 (1:800, Sigma, USA) and anti-β-actin (1:500, Santa Cruz, USA) at 4 °C overnight, followed by incubation in HRP-conjugated secondary antibodies (Santa Cruz, USA) at room temperature for 1 h. Then, the protein bands were detected using a chemiluminescent HRP substrate (Millipore, USA). The images were captured using a Syngene GBox Imaging System.
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5

Western Blot Analysis of IL-6R Signaling

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Whole protein extracts were prepared and analyzed by Western blotting, according to a standard procedure. The following antibodies were used: anti-IL-6R (Abcam, Cambridge, UK); anti-phospho STAT3 (Tyr705, clone 3E2) and anti-STAT3 (Cell Signaling Technology, Danvers, MA, USA); anti-α-tubulin clone DM1A (Sigma-Aldrich, Milan, Italy). Densitometric analysis was performed using the ImageJ software. The original Western blotting images are shown in Figure S3.
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6

Western Blot Analysis of Immune Receptors

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The western blot was performed as described previously.40 Briefly, NPs, MMNPs, macrophage membrane extraction, or total protein extracted from heart tissues were subjected to sodium dodecyl sulfate–polyacrylamide gel electrophoresis and then were transferred to polyvinylidene fluoride membranes. The membranes were blocked with 5% non‐fat milk for overnight at 4°C. Next day, primary antibodies were added to the membrane and incubated at room temperature for 2 h. After wash, corresponding horse radish peroxidase‐conjugated secondary antibodies were incubated for 1 h at room temperature. Immuno‐reactive bands were visualized using ECL substrate kit (Abcam, China). Antibodies used in present study include: anti‐IL‐1R (Abcam, Beijing, China), anti‐IL‐6R (Abcam, China), anti‐tumor necrosis factor receptor 1 (TNFRI) (Abcam, China), anti‐CD86 (Abcam, China), and anti‐CD206 (Abcam, China).
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7

Quantifying Inflammatory Receptor Proteins

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After being denatured by heating at 95°C in an SDS sample buffer, the
supernatant samples were loaded onto Mini-Protean TGX Precast gels (Bio-Rad
Laboratories, Hercules, CA, USA) and electrically transferred to a polyvinylidene
fluoride membrane. The membrane was then incubated overnight with primary antibodies:
rabbit anti-IL-1R, anti-IL-6R and anti-TNFR1 (Abcam Co., Cambridge, UK, diluted
1:200). After being fully washed, the membrane was incubated with horseradish
peroxidase-linked anti-rabbit secondary antibody and visualized for immunoreactivity.
The membrane was stripped and incubated with mouse anti-β-actin to show equal
loading of the protein. The bands recognized by the primary antibody were visualized
by exposure of the membrane onto an X-ray film. Then, the film was scanned and the
optical densities of IL-1R, IL-6R, TNFR1 and β-actin bands were determined
using the public domain ImageJ program (made by Wayne Rasband, Scion Corporation,
Bethesda, MD, USA). Then, values for densities of immunoreactive bands/β-actin
band from the same lane were determined. Each of the values was then normalized to a
control sample.
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