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29 protocols using anti myd88

1

Immunoblotting for MyD88 and IL-1R1

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Cell lysates were standardized for protein content, resolved on 4%–12% SDS polyacrylamide gels, and blotted onto nitrocellulose membranes. Membranes were probed with rabbit anti-MyD88 (1:500, Cell Signaling), anti-IL-1R1 (1:500, Santa Cruz), anti-beta-actin (1:5000, Thermo Scientific). Antibody binding was detected by using an ECL Chemiluminescence Kit (Amersham).
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2

Quantifying Tight Junction Proteins and TLR4 Pathway

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Occludin and ZO-1 are vital tight junction proteins to maintain barrier function (25 (link)). Toll-like receptor 4 (TLR4) and its downstream myeloid differentiation factor 88 (MyD88) form an important pathway to promote the activation of microglia (26 (link)). The relative levels of Occludin and ZO-1 expression in the intestine and brain and TLR4 and MyD88 expression in the brain to the β-actin were quantified by Western blotting. Briefly, each type of tissue samples were homogenized in lysis buffer (Servicebio) and centrifuged. After determining protein concentrations using the bicinchoninic acid method, the lysates (30 μg/lane) were separated by sodium dodecyl sulfate–polyacrylamide gel electrophoresis on 10% gels and transferred onto polyvinylidene fluoride membranes. The membranes were blocked with 5% non-fat dry milk in phosphate-buffered saline (PBS) containing Tween 20 and probed with anti-Occludin, anti-ZO-1, anti-TLR4, and anti-MyD88 (Cell Signal Technology) at 4°C overnight. After being washed, the bound antibodies were detected with appropriate horseradish peroxidase (HRP)-conjugated secondary antibody (Servicebio) and visualized with enhanced chemiluminescence.
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3

Protein Expression Analysis Protocol

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Anti-human CHD1L (ab51324), CHD1L (ab197019), anti-MYLK (ab232949), anti-Cyclin D1 (ab134175), and anti-hnRNP A2/B1 (ab31645) antibodies were purchased from Abcam. Anti-human GAPDH (#5174), anti-NF-κB pathway sampler kit (#9936), Apoptosis Antibody Sampler Kit (#9930), anti–rabbit IgG (#6990), anti–MLC2 sampler kit (#9776), anti-MyD88 (#4283), and anti-IRAK4 (#4363) Proteins were purchased from Cell Signaling Technology (CST).
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4

Western Blot Analysis of Signaling Pathways

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Brain tissues (hippocampus and cortex) were lysed with radioimmunoprecipitation assay buffer containing 1 mM phenylmethylsulfonyl fluoride. The lysates were centrifuged at 12,000×g for 15 min at 4 °C, and the protein concentration of each sample was determined using a BCA protein assay kit (Beyotime) according to manufacturer instructions. Protein samples (50 μg) were boiled for 10 min, electrophoresed on 10% sodium dodecyl sulfate polyacrylamide gels, and transferred to polyvinylidene fluoride membranes. The membranes were blocked with 5% skimmed milk in Tris-buffered saline and Tween-20 (TBST) for 2 h at room temperature. The membranes were then incubated at 4 °C overnight with the following primary antibodies: anti-phospho-PI3K, anti-PI3K, anti-phospho-AKT, anti-AKT, and anti-MyD88 (1:1000; Cell Signaling Technology, Danvers, MA, USA), and anti-TrkB (1:1000; Abcam, Cambridge, UK). The membranes were washed with TBST three times for 10 min each and incubated with the appropriate secondary antibody for 1 h. Proteins were visualized by chemiluminescence (Millipore, Billerica, MA, USA) and quantitated using ImageJ software (National Institutes of Health, Bethesda, MD, USA).
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5

Quantitative Analysis of Innate Immune Signaling

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Mφ transfected with either Mal siRNA or control siRNA were washed with PBS and disrupted with lysis buffer (50 mmol L−1 Tris-HCl, 250 mmol L−1 NaCl, 5 mmol L−1 EDTA, 1 mmol L−1 dithiothreitol, 5% glycerol, 0.2% Nonidet P-40 at pH 8) containing a protease inhibitor cocktail (Roche Applied Science). Protein concentrations were determined using the DC protein assay (Bio-Rad, Hercules, CA). Equal amounts of whole cell lysates (50–100 μg) were loaded in each lane for separation by SDS-PAGE and transferred to a nitrocellulose membrane. After blocking in Tris-buffered saline containing Tween 20 (0.1%) (T-TBS) and milk (5%) at room temperature for 2 h, the membrane was then incubated at 4°C overnight with primary antibodies. After washing with T-TBS, the membrane was incubated at room temperature for 1 h with HRP-conjugated anti-rabbit IgG secondary antibody (Cell Signaling Technology, Danvers, MA). The primary anti-Mal (Abcam, Cambridge, UK), anti-MyD88 (Cell Signaling Technology), anti-TRIF (Novus Biologicals, Littleton, CO), anti-TLR-4 (Novus Biologicals) and anti-β-actin (Sigma- Aldrich) antibodies were diluted and used as described in the manufacturer’s instructions. The density of each band was quantified by densitometric analysis with Image J software (Image Processing and Analysis in Java) from the NIH (https://imagej.nih.gov/ij/).
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6

Western Blot Analysis of Protein Signaling

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Protein extracts were subjected to SDS-PAGE (8–12% gels) and blotted onto PVDF membranes. After blocking with 5% fat-free milk, the membranes were incubated with the following antibodies at 4 °C overnight: anti-OPTN (sc-166576, 1:1000), anti-TLR4 (sc-293072, 1:1000), and anti-Lamin B (sc-6216, 1:1000) were purchased from Santa Cruz; anti-JAK2 (#3230, 1:1000), anti-p-JAK2(Tyr1007/1008) (#3771, 1:1000), anti-STAT3 (#9139, 1:1000), anti-p-STAT3(Y705) (#9145, 1:1000), anti-MyD88 (#4283, 1:1000), anti-p-NF-κB (#3033, 1:1000), anti-HA (#3724, 1:1000), and anti-Flag (#86861, 1:1000) were purchased from Cell Signaling Technology; anti-NF-κB (ET1603-12, 1:1000), anti-p38 MAPK (ET1602-26, 1:1000), anti-p-p38 MAPK (ER1903-01, 1:1000), anti-IRF3 (ET1612-14, 1:1000), and anti-p-IRF3(S386) (ET1608-22, 1:1000) were purchased from Huabio; anti-GAPDH (db106, 1:5000) was purchased from DiagBio Technology. The bound antibodies were detected using horseradish peroxidase (HRP)-conjugated IgG (MULTI Sciences) and visualized with enhanced chemiluminescence (ECL, PerkinElmer) detection reagents (Thermo Scientific, USA). GAPDH or Lamin B was used as a loading control. Images were taken by GE AI600.
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7

Immunoblotting Analysis of TLR Signaling Pathway

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The following primary antibodies were used: mouse monoclonal anti-β-Actin (12262, 1:1000, Cell Signaling), mouse monoclonal anti-GAPDH (51332, 1:1000, Cell Signaling), rabbit polyclonal anti-BIG1 (A300-998A, 1:1000, Bethyl), rabbit monoclonal anti-IκBα (4814, 1:1000, Cell Signaling), rabbit monoclonal anti-pS536-p65 (3033, 1:1000, Cell Signaling), rabbit monoclonal anti-pS176/180-IKKα/β (2697, 1:1000, Cell Signaling), rabbit monoclonal anti-TLR4 (14358, 1:1000, Cell Signaling), rabbit monoclonal anti-MyD88 (4283, 1:1000, Cell Signaling), rabbit polyclonal anti-TIRAP (ab17218, 1:1000, Abcam), mouse monoclonal anti-PIP2 (sc53412, 1:200, Santa Cruz), rabbit polyclonal anti-ARF1 (PA1-127, 1:2000, Thermo Fisher), mouse monoclonal anti-ARF3 (610784, 1:500, BD Biosciences), mouse monoclonal anti-ARF5 (H00000381-M01, 1:500, Abnova), rabbit polyclonal anti-ARF6 (ab77581, 1:1000, Abcam), and mouse monoclonal anti-Myc-Tag (2276, 1:1000, Cell Signaling). Chemical reagents used are as follows: LPS (L4516, Sigma-Aldrich; L23351, Invitrogen), R848 (tlrl-r848-5, Invitrogen), CpG ODN (tlrl-2395-5, Invitrogen), FSL-1 (tlrl-fsl, Invitrogen), Pam3csk4 (tlrl-pms, Invitrogen).
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8

Immunoblot Analysis of Signaling Proteins

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Equal amounts of total protein were separated by SDS-PAGE and then transferred to nitrocellulose membranes by semi-dry blotting as previously described [23 (link),24 (link)]. After blocking the membranes with 5% non-fat dry milk, they were probed with antibodies to either phosphorylated p38, JNK, Akt (Cell Signaling, Beverly, MA), phosphorylated ERK (Santa Cruz Biotechnology, Santa Cruz, CA), phosphorylated IκB (New England BioLabs, Beverly, MA), anti-MyD88, ATG16L1, Beclin-1, Atg5, rabbit anti-LC3 (Cell Signaling, Beverly, MA), or anti-NOD1 and NOD2 (Cayman Chemical, Ann Arbor, MI), and then developed with horseradish peroxidase-conjugated second antibodies (Zymed Laboratories, San Francisco, CA) and enhanced chemiluminescence (Pierce Chemical Co., Rockford, IL). Appropriate exposures to X-ray film were made, and the filters then stripped and re-probed with antibodies to GAPDH (Santa Cruz Biotechnology, Santa Cruz, CA) as appropriate.
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9

Quantification of Tight Junction and Inflammatory Proteins

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The levels of Occludin and ZO-1 in the intestine and TLR4 and MyD88 in the brain relative to β-actin were quantified by Western blotting. In brief, tissue samples were homogenized in lysis buffer (Servicebio, Wuhan, China) and centrifuged. After the protein concentrations were determined using the bicinchoninic acid method, the lysates (30 μg/lane) were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis on 10% gels and transferred onto polyvinylidene fluoride membranes. The membranes were blocked with 5% nonfat dry milk in phosphate-buffered saline (PBS) containing Tween 20 and probed with anti-occludin, anti-ZO-1, anti-TLR4 and anti-MyD88 (Cell Signaling Technology, Denver, United States) at 4°C overnight. After being washed, the bound antibodies were detected with appropriate horseradish peroxidase (HRP)-conjugated secondary antibodies (Servicebio, Wuhan, China) and visualized with enhanced chemiluminescence.
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10

Molecular Signaling Pathway Analyses

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The Escherichia coli 0111: B4 LPS, N-hexanoyl-D-sphingosine (C6-ceramide) and zVAD-FMK were obtained from Sigma-Aldrich (St. Louis, MO, USA). DAPK1 inhibitor and ST2825 were purchased from Medchem Express (Monmouth Junction, New Jersey, USA). Recombinant GST-DAPK1 fusion protein was obtained from Millipore (Billerica, MA). Caspase-3 activity detection kit was from Bestbio (Shanghai, China). Quantikine human IL-6 ELISA kit was from R&D Systems (Minneapolis, MN). Annexin V-FITC apoptosis detection kit was ordered from Beyotime (Nanjing, China). The following antibodies with the company and concentration were used for coimmunoprecipitation (co-IP) or western-blotting analyses: anti-Pellino1 (Abcam, 1:500), anti-MyD88 (Cell Signaling Technology, 1:500), anti-caspase-8 (Cell Signaling Technology, 1:500), anti-TRIF (Cell Signaling Technology, 1:1000), anti-RIP1 (BD Biosciences, 1:2000), anti-Flag (ProteinTech group, 1:1000), anti-phospho-DAPK1 (Sigma-Aldrich, 1:1000), anti-DAPK1 (Cell Signaling Technology, 1:1000), anti-Fbxw7 (Abcam, 1:1000), anti-pSer (Santa Cruz, 1:1000), anti-Fn14 (Cell Signaling Technology, 1:2000) and anti-GAPDH (Biosynthesis, 1:3000).
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