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5 protocols using horseradish peroxidase hrp conjugated goat anti rabbit

1

PTEN Protein Expression Analysis

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Total proteins were lysed by RIPA buffer (added with protease inhibitors) on ice and then were centrifuged at 12,000 × g at 4°C for 5 min. A mixture of equal protein and sample buffer was subjected to 15% SDS-PAGE. The separated protein was then transferred onto a PVDF membrane (Millipore Corporation, Billerica, MA, USA). The PVDF membrane was blocked in blocking buffer (containing TBST and 5% fat-free milk) for 1 h at room temperature. Primary antibody (rabbit anti-PTEN antibody, 1:1,000) was purchased from Cell Signaling Technology, Inc. (Danvers, MA, USA). GAPDH acted as the internal reference. PVDF membrane was incubated in the diluted primary antibodies at 4°C overnight. The PVDF membrane was then incubated with horseradish peroxidase (HRP)-conjugated goat anti-rabbit (1:500; Abcam, Cambridge, MA, USA) at 4°C overnight. Immunoblots were visualized by ECL kit (Santa Cruz Biotechnology, Santa Cruz, CA, USA) and scanned by ImageJ software. The band densities of each sample were normalized to the GAPDH band.
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2

Detecting Donor HLA in Circulating Exosomes

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To detect donor HLA in circulating exosomes, we used the enzyme-linked immunosorbent assay (ELISA) method as described by Logozzi M et al, [17 (link)] with minor modifications. We set up an ELISA protocol for measuring HLA-A2 in the circulating exosomes since HLA-A2 is one of the high frequency HLA antigen in our population. In brief, antibodies (Abs) to CD9 (Bio-Legend) were coated in 96-well plates, followed by blocking with 0.5% bovine serum albumin in PBS) Circulating exosomes (1mg/ml) isolated from sera of LTxRs were then added and incubated at 37°C for 12 hours, followed by addition of a rabbit Ab specific to HLA-A2 (Abcam) and secondary Ab, horseradish peroxidase (HRP) conjugated goat anti-rabbit (Abcam). Reaction was developed with chemiluminescent reagent (Millipore) for 15 minutes and stopped with 0.1N HCl. Optical density was measured at 450 nm. Data were expressed as mean ± standard deviation, and p-values were deemed significant at less than 0.05.
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3

Western Blot Protein Analysis Protocol

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Proteins from cells were obtained in protein extraction reagent RIPA lysis buffer (Beyotime) with 10 mM phenylmethylsulphonyl fluoride (Beyotime) at 4 °C for 30 min. The supernatant was harvested after centrifugation at 12000 rpm for 30 min. A BCA assay kit (Beyotime) was used to determine protein concentration. Then, equal amounts of protein samples were added to the loading buffer (Beyotime). After heating at 95 °C for 5 min, each sample was run on a 10% SDS polyacrylamide gel. The separated proteins were electrically transferred onto PVDF membrane (Millipore,USA), which were then blocked with 5% (w/v) no-fat dry milk in TBST for 1 h at room temperature. After blocking, the membranes were incubated with primary antibodies (Supplement Table 3) overnight at 4 °C, followed by incubation in horseradish peroxidase (HRP)-conjugated goat anti-rabbit (Abcam, UK) for 1 h. Immunoreactive bands were visualized by enhanced chemiluminescence (Millipore) and quantitative analyzed by Image J software. β-actin was used as an internal control standard to analyze relative protein expression.
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4

BAMBI Protein Extraction and Detection

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Total protein extraction was accomplished using RIPA buffer (Beyotime, Shanghai, China). After measurement of the protein concentration using a bicinchoninic acid protein assay kit (Beyotime), the protein samples were subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) separation and transferred onto a polyvinylidene difluoride (PVDF) membrane. The membrane was blocked with 5% skim milk and incubated with specific primary antibodies against BAMBI (ab203070; 1:1,000, Abcam, Cambridge, MA, USA) and GAPDH (ab9485; 1:2000, Abcam, Cambridge, MA, USA) at 4 °C. After incubation overnight, the membrane was incubated with horseradish peroxidase (HRP)-conjugated goat anti-rabbit (1:2,000, Abcam, Cambridge, MA, USA) secondary antibody for 2 hours at room temperature. Finally, the signals were detected using an electrochemiluminescence (ECL) kit (Thermo Fisher Scientific, Inc.). GAPDH was used as the internal control.
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5

DUSP5 Overexpression Modulates SGIV Infection

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GS cells transfected with 800 ng pcDNA-3.1-3HA/pcDNA-3.1-DUSP5 for 24 h were infected with SGIV for 24 h. The cells were collected and lysed by pierce IP lysis buffer (Thermo Fisher), then separated by 10% sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS-PAGE). Subsequently, the proteins were transferred onto 0.2 μm PVDF membranes (Millipore, Billerica, MA, USA) and blocked using 5% skim milk for 2 h. The membranes were incubated with rabbit anti-MCP antibody (1:1000 dilution), which was prepared in our lab with the patent number CN111363758A [19 (link)]. Rabbit anti-β-tubulin antibody (1:2000 dilution), anti-3HA antibody (1:1000 dilution), anti-caspase3 (1:1000 dilution), and anti-cleaved caspase3 (1:1000 dilution) were purchased from Abcam. The horseradish peroxidase (HRP)-conjugated goat anti-rabbit (1:5000 dilution) was purchased from Abcam as well. Immuno-reactive proteins were visualized by an enhanced HRP-DAB Chromogenic Substrate Kit (Tiangen, Beijing, China).
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