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71 protocols using complete mini tablet

1

Quercetin's Impact on Dopamine and BDNF

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Dopamine release was measured with a Dopamine Research ELISA (ImmuSmol, Bordeaux, France). Brain tissue extracts were collected from the nucleus accumbens of animals that were fed the control chow diet (n = 8) or the quercetin-rich chow diet (n = 8) by using an extraction buffer [0.01 N HCl, 1 mM EDTA, 4 mM sodium metabisulfite, pH (7.0)] with Roche cOmplete Mini tablets (Roche, Mannheim, Germany) according to the manufacturer's protocol. BDNF levels were measured with a Mature BDNF Rapid ELISA Kit (Bisensis Pty Ltd., Thebarton, Australia). Additionally, brain tissue extracts were collected from the nucleus accumbens of animals that were fed the control chow diet (n = 8) or the quercetin-rich chow diet (n = 8) by using an acid extraction buffer [50 mM sodium acetate, 1 M NaCl, 0.1% Triton X-100, pH (4.0)] with Roche cOmplete Mini tablets (Roche, Mannheim, Germany) according to the manufacturer's protocol.
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2

CSF Protein Extraction and Trypsin Digestion

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CSF was collected from 500 embryos, and stored at −80°C in PBS + protease inhibitors (Roche cOmplete Mini tablets EDTA free). Experiment was repeated three times. Proteins were initially separated on a 10–20% SDS-PAGE gel, and each gel lane to be analyzed was excised and cut into six segments of approximately equal length. Each gel fragment was further cut into smaller pieces, typically 1mm2 in order to facilitate de-staining and SDS removal. In-gel reduction, alkylation and trypsin digestion were performed following published procedures (Shevchenko et al., 2007 (link)). Trypsin digestion was carried out overnight at room temperature.
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3

Renal Antioxidant Enzymes Activity Assay

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Renal cortex (100 mg) was homogenized in Eppendorf tubes with 1 mL of cold phosphate buffer (50 mM, pH 7) and a protease inhibitor mixture (Complete Mini Tablets, Roche). One tablet per each 10 mL of buffer solution [reference number SKU 11697498001, Sigma–Aldrich Chem. Co., St. Louis, MO, USA] was added at 4 °C and 10,000 r.p.m., in three cycles. Afterwards, 1 mL of each homogenate were centrifuged at 10,500 r.p.m. and 4 °C/15 min, and supernatant´s aliquots for each evaluation were subsequently taken. The rest of volume of complete uncentrifuged homogenates were kept at −80 °C until further use.
For antioxidant enzymes activity determination, all of absorbance was measured in a Shimadzu Double-Beam Scanning UV–Vis Spectrophotometer (Model UV-1700, SHIMADZU Corporation, Nishinokyo Kuwabara-cho, Nakagyo-ku, Kyoto 604-8511, Japan). All chemical reagents used were obtained from Sigma–Aldrich Company (St. Louis, MO, USA), unless otherwise indicated. Previous techniques described for catalase (CAT) [64 (link)], superoxide dismutase (SOD) [65 (link)] and glutathione peroxidase (GSH-Px) [66 ] were followed. Finally, Malonaldehyde (MDA), one of the end products of lipid peroxidation (LPO) reaction, was quantified in renal tissue also using Thiobarbituric acid reactive substances (TBARS) technique described by Ohkawa et al. [67 (link)].
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4

Quantifying Gut-Associated Cytokines

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The cytokines IL-10, IFN-γ, and TNF-α were quantified in serum and jejunum samples by using Simplex Luminex kits for each immune parameter and ProcartaPlex Basic Rat kits (eBioscience, Vienna, Austria) in a Luminex 100 IS™ (Luminex Corporation. Austin, TX, USA). The jejunum samples (100 mg) were first manually disaggregated with sterile scalpels, and the resulting tissue sections were homogenized in 0.5 mL RIPA buffer containing a cocktail of protease inhibitors (Complete, Mini tablets, Roche Life Science, Mannheim, Germany). Homogenization was completed by using a TissueRuptor® device (Qiagen, Hilden, Germany), and the samples were kept on ice during the procedure. Then, the samples were centrifuged (16,000× g for 10 min at 4 °C), and the protein concentration of the resulting supernatant was quantified and adjusted to 10 mg/mL for cytokine assessment as recommended by the manufacturer. These measurements were carried out in duplicate for each sample.
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5

Western Blot Analysis of BDNF and TrkB

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CA1 and CA3 tissue were lysed in radioimmunoprecipitation assay (RIPA) buffer (50 mM Tris, pH 7.4, 1% NP-40, 0.1% SDS, 0.5% Na deoxycholate, 4 mM EDTA, 150 mM NaCl, protease and phosphatase inhibitors [cOmplete mini tablets (Roche)], 10 mM sodium pyrophosphate, 50 mM NaF, and 2 mM sodium orthovanadate). Total protein concentration was quantified by BCA (bicinchoninic acid) protein assay. Twenty micrograms of total protein per well was loaded on SDS-PAGE gels and transferred to nitrocellulose blots, and then placed in blocking solution for 60 min at room temperature. Blots were incubated in anti-BDNF (1:2,000; Abcam), anti-TrkB (1:2,500; Abcam), or anti-GAPDH (1:50,000; Cell Signaling) antibodies at 4°C overnight. HRP-conjugated anti-mouse secondary antibody was used for BDNF (1:2,000), and anti-rabbit secondary antibody for TrkB (1:2,000) and GAPDH (1:10,000). Bands were developed with enzymatic chemiluminescence (ECL) and detected by UVP Biospectrum imaging system. Image files were analyzed with ImageJ. BDNF or TrkB signals were normalized to their respective GAPDH signals and expressed as percentage to the control group.
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6

ELF3 Protein Stability Assay

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WT and XBAT31ox-1 plants grown at 22°C under long days (LDs) for 4 days were transferred to 29°C for 3 days and sampled at ZT 8 hours. Seedlings were harvested, and total proteins were extracted using the extraction buffer [50 mM tris-MES (pH 8.0), 0.5 mM sucrose, 1 mM MgCl2, 10 mM EDTA, and 5 mM DTT] with freshly added protease inhibitor cocktail cOmplete Mini tablets (Roche, Shanghai, China). After that, the protein mixtures were incubated with 10 mM ATP and 50 μM cycloheximide (CHX) at 29°C for 0 to 100 min in the presence or absence of 50 μM MG132. After SDS-PAGE, the abundance of ELF3 was detected by Western blotting. Three independent experiments were performed, and each immunoblot was quantified using ImageJ software.
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7

Protein Extraction and Biotinylation Analysis

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The cell pellets were resuspended in a cold extraction buffer (0.5% CHAPS; 2 mM β-mercaptoethanol; 25 mM Tris-HCl; 100 mM NaCl; 20 mM CaCl2; 1 mM phenylmethylsulfonyl fluoride), with addition of protease inhibitors (Complete Mini Tablets, Roche), and disrupted with a dounce homogenizer and zirconium beads, for 20 cycles in an ice bath, to obtain the total cell extract. The preparations were centrifuged at 18,000xg for 30 min at 4°C to obtain the clarified total extracts. The protein concentrations in both extracts were determined by the Pierce™ Bicinchonic Acid (BCA) Protein Assay Kit, ThermoFisher, following manufacturer’s instruction. To analyze the protein pattern of the extracts, 10 μg of proteins were resolved by 10% SDS-PAGE, as described elsewhere (Gonçalves et al., 2019 (link)). The efficiency of surface protein biotinylation was analyzed by Western blot using an alkaline phosphatase-streptavidin conjugate (SouthernBiotech, AL, USA) and developed with an NBT/BCIP substrate (ThermoFisher) as described (Gonçalves et al., 2019 (link)).
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8

Decellularization and Protein Extraction of Whole Left Ventricles

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Whole LVs were decellularized as previously reported [23 (link)]. In summary, the tissue was incubated in decellularization buffer (1% sodium dodecyl sulfate in PBS) with 1x protease inhibitors cocktail (PI; cOmplete Mini tablets, Roche). Samples were left at room temperature in an orbital shaker until tissue was completely decellularized (three to four days). The decellularization buffer was decanted daily and replaced with fresh decellularization buffer. When tissue looked translucent, samples were considered decellularized. Tissue was washed three times in distilled water with 1x PI for 5 min and then left in fresh 1x PI/water overnight to remove all remnants of the decellularization buffer. The decellularized LVs were homogenized (Power Gen 1000, Fisher Scientific) in Protein Extraction Reagent Type 4 (7.0 M urea, 2.0 M thiourea, 40 mM Trizma base, and 1.0% C7BzO, pH 10.4) and 1x PI. Protein quantification was performed using a Coomassie Brilliant Blue G-250-based assay (Quick Start Bradford Protein Assay, Bio-Rad). All samples were stored at −80°C until use.
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9

Optimized Western Blotting Protocol

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For Western blotting, equal number of cells were seeded in 6 well dishes and the samples were extracted by directly boiling with 2× Laemmli sample buffer. In certain cases, cells were lysed with 50 mM Tris (pH 7.4), 150 mM NaCl, 1mM EDTA, 10% glycerol, 0.5% NP-40 and protease inhibitors (Roche, complete mini tablets) at 4oC for 30 minutes, followed by centrifugation at 14000 rpm at 4oC. Proteins were separated using SDS PAGE, and then transferred to 0.2 or 0.45 μM nitrocellulose membranes. The membranes were blocked either with 5% BSA or 5% milk in 1X TBST. Primary antibodies were incubated overnight at 4oC, washed 3× with 1X TBST and then incubated with Odyssey secondary antibodies (1:10,000) for 90 minutes at room temperature. The blots were subsequently washed 2× with TBST and once with TBS and developed with an Odyssey infrared scanner.
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10

Lysosomal Fraction Isolation and GCase Assay

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To isolate the lysosomal fraction, cell pellets, collected as earlier described, were resuspended in PBS with protease inhibitor (Complete Mini Tablets, Roche) and homogenized with a 5 ml syringe with a 21 G needle. This was followed by centrifugation (1,000 g, 10 min, 4 °C) to pellet nuclei and cell debris. The supernatant was collected and centrifuged (20,000 g, 30 min, 4 °C) to pellet the lysosomal fraction. Total cell pellets or lysosomal fraction pellets were sonicated at 10 amp for 10 sec in citrate phosphate buffer pH 5.4 consisting of 0.1 M citric acid (Sigma) and 0.2 M dibasic sodium phosphate (Sigma) with 0.25% (v/v) Triton X and 0.25% (w/v) taurocholic acid (Sigma). Samples were centrifuged at 800 g for 5 min at 4 °C, and the supernatant was collected. Then samples were diluted in citrate phosphate buffer in quadruplicate. One replicate of each sample was treated with 1 mM conduritol B epoxide (CBE, Calbiochem) for 10 min before all samples were incubated for 1 h with 2.5 mM of the fluorescent GCase substrate methylumbillifery β-D-glucopyranoside (4MUG, Sigma) at 3 °C in the dark. The reaction was quenched with 1 M glycine buffer (Sigma) pH 10.8, and the fluorescent levels were analysed on the PHERAStar FSX plate reader (BMG Labtech). Values from CBE-treated wells were subtracted as background.
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