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4 protocols using ripa extraction buffer

1

Western Blot Analysis of Colon Proteins

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Colon tissues or cells were lysed using RIPA extraction buffer (R0010, Solarbio, China). Protein concentrations were quantified using BCA protein assay kit (PC0020, Solarbio, China). Proteins were separated on 10% SDS polyacrylamide gels and then transferred to PVDF membranes. Membranes were blocked with quickblock solution (P0231, Beyotime, China) for 15 minutes, and then blocked with antibodies against STAT3 (4904, CST), p-STAT3 (9145, CST), Il-10 (A12255, ABclonal) and Tlr2 (13744, CST) at 4°C overnight. The membranes were then incubated with secondary antibody-conjugated HRP (1:10000, Abcam) for 1 hour at room temperature, and bands were visualized using an ECL kit (FD8000, Fdbio science, China). β-actin served as a loading control.
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2

Protein Expression Analysis in Colonic Tissue

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The colonic tissues were lysed with RIPA extraction buffer (Solarbio, China) containing a 1% protease inhibitor cocktail. Following centrifugation at 12,000 rpm for 15 min at 4°C, the supernatant was collected and the total protein concentration was quantified using a bicinchoninic acid (BCA) protein assay kit (Solarbio, China). Proteins were separated by SDS–polyacrylamide gel electrophoresis and transferred onto polyvinylidene difluoride (PVDF) membranes (Millipore, USA). The membranes were blocked with 5% skim milk for 1.5 h and incubated with primary antibodies against PXR (Abcam, USA), E-cadherin (Cell Signaling Technology, USA), Cyp1a1 (Cell Signaling Technology, USA), and occludin (Cell Signaling Technology, USA) overnight at 4°C. The membranes were washed and incubated with HRP-labeled secondary antibodies at room temperature for 2 h, followed by signal detection with an ECL Kit (Solarbio, China).
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3

Western Blot Analysis of Tight Junction Proteins

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Colon tissue was weighed and homogenized in RIPA extraction buffer (Solarbio, China). The homogenate was centrifuged at 4°C for 15 min at 15,000 g, then the supernatant was collected. The protein concentration was quantified with BCA protein assay kits (Solarbio, China) according to the manufacturer’s instructions. Proteins were separated by 10% SDS polyacrylamide gel, and then transferred onto PVDF membranes. The membranes were blocked with 5% skimmed milk for 1 h and then immunoblotted with primary antibodies against occuludin (ab167161, Abcam), claudin (36–4800, Thermo Fisher Scientific), helios (#89270, CST) at 4°C overnight. Membranes were then incubated with second antibodies labeled with HRP at room temperature for 1 h and bands were visualized using an ECL kits (Fdbio science, China). β-actin was used as a reference gene.
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4

Western Blot Analysis of Stem Cell Markers

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Tissue was weighed and homogenized in RIPA extraction buffer (Solarbio, China). The homogenate was centrifuged at 4 °C for 15 min at 15,000 × g, then the supernatant was collected. The protein concentration was quantified with BCA protein assay kits (Meilun, China) according to the manufacturer’s instructions. Proteins were separated by 10% SDS polyacrylamide gel and then transferred onto PVDF membranes. The membranes were blocked with 5% skimmed milk for 1 h and then immunoblotted with primary antibodies: p53 (ab167161, Abcam,1:1000), p21 (sc-6246,Santa Cruz,1:500), Lgr5 (Bioss, bs-20747R, 1:1000), c-Myc (CST, #5605S, 1:1000), Cyclin D1 (CST, # 2978, 1:1000), Active β-Catenin (CST. # 8814, 1:1000), Reg4 (Abclonal, A13129, 1:1000), β-actin (ET1701-80, HUABIO, 1:1000), Gapdh (ET1601-4, HUABIO,1:1000) at 4 °C overnight. Membranes were then incubated with second antibodies (HA1019, HA1006, HUABIO,1:10,000) labeled with HRP at room temperature for 2 h, and bands were visualized using an ECL kit (Fdbio science, China). β-Actin or Gapdh was used as a reference protein.
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