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3 protocols using trpv1

1

Western Blot Analysis of MAPK Signaling Pathways

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DRG tissues were collected from mice and later disrupted in RIPA mixed with PMSF and protease inhibitor cocktail (1×) on ice. Total protein (20 μg) was separated by 10% SDS polyacrylamide gels and then transferred to PVDF membranes (Bio-Rad). After the membranes were blocked for 1 h at room temperature in Tris-buffered saline Tween-20 (TBST) containing 5% skim milk, followed by incubation with primary antibodies specific for p38MAPK (1:4000, CST, Danvers, MA, United States), p-p38MAPK (1:4000, CST), ERK1/2 (1:4000, Abcam, MA, United States), p-ERK1/2 (1:4000, CST), JNK (1:3000, Abcam), p-JNK (1:3000, Abcam), NF-κB (1:4000, Abcam), TRPV1 (1:2000, Neuromics, INA), and GAPDH (1:8000, CST) at 4°C overnight. After being washed with TBST three times, the membranes were incubated with secondary antibodies (1:10,000, Proteintech, WH, CHN) for 1 h at room temperature. After being washed with TBST three times, the antibodies were detected with ECL reagents (Tanon, SH, CHN). Immunoreactivity was detected by chemiluminescence. The results were quantified using ImageJ software.
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2

Proximity Ligation Assay for DRG Proteins

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PLA was performed using PLA kits (Sigma) as previously described (19 (link)). Antibodies used were ANO1 (1:200; Santa Cruz or 1:500; Abcam), TRPV1 (1:500; Neuromics) and IP3R1 (1:500; Calbiochem), CD71 (1:500, Santa Cruz). For anti-guinea pig antibodies (such as TRPV1), PLA ‘minus’ probes were manually conjugated onto an anti-guinea pig IgG antibody using a PLA conjugation kit. DRG cultures were prepared and plated on microscope slides (coated with poly-d-lysine and laminin) and permeabilized using acetone:methanol (1:1) on ice for 20 minutes and washed with PBS 3 times. Hydrophobic barriers were made on the slides using an ImmEdge hydrophobic barrier pen (Vector laboratories) to delimit reactions to ~1cm2 and blocking was done using the PLA blocking reagent for 30 minutes in a humidified incubator (37°C). Primary antibodies were then applied and left at 4°C overnight. The following day, PLA probes were applied to the samples; signals were amplified and detected according to the manufacturer’s instructions; and slides were sealed with DAPI-containing mounting medium (Sigma). Samples were imaged using the Zeiss LSM700 confocal microscope. Green fluorescent puncta (0.5–1μm) were counted per cell using Zen imaging software (Zeiss).
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3

Quantification of COX2 and TRPV1 Protein Levels

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Sciatic nerve and L4-L6 spinal cord were separated and homogenized using a homogenizer at 4 °C with lysis buffer (PRO-Prep™). Homogenized tissue centrifuged at 13,000 rpm for 10 min. The protein concentration was measured at 595 nm by adding Bio-Rad Protein Assay Kit (Bio-Rad Hercules, CA, USA). The prepared sample was subjected to electrophoresis and nitrocellulose membrane protein transfer and COX2 (1:1000, Cell Signaling, Danvers, MA, USA) and TRPV1 (1:1000, Neuromics, Edina, MN, USA) primary antibody were reacted at 4 °C for 24 h, reacted with secondary antibody for 2 h, and then ECL prime (Amersham Pharmacia Biotech, Buckinghamshire, UK). The degree of expression was measured using Image J software.
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