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13 protocols using ltb4 eia kit

1

Quantifying Leukotriene B4 by EIA

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VAT was processed in RIPA solution (Cell Signaling, Danvers, MA, USA), and ethanol (2:1) was used to precipitate proteins. Ethanol was then evaporated under nitrogen, and LTB4 was measured using LTB4 EIA Kit (Cayman, Ann Arbor, MI, USA) following the manufacturer’s instruction.
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2

Quantification of LTB4 and IL-1β in Tumors

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Subcutaneous tumors were homogenized in 500 ul 1x PBS buffer containing 10uM Indomethacin using Omni GLH general homogenizer. The homogenates were centrifuged at 14000 g for 10 min and LTB4 levels in the supernatants were quantified. The LTB4 levels were normalized to the amount of protein in the supernatants measured by Themo Sceintific Pierce BCA protein assay kit following manufacturer's instructions. LTB4 in the tumor homogenate supernatant was expressed as pg/mg of protein. LTB4 in cell culture supernatants, BALF, air pouch lavage and subcutaneous tumors was measured using LTB4 EIA Kit (Cayman Chemical) according to the manufacturer's instructions. IL-1β in cell culture supernatants was measured using Mouse IL-1β ELISA MAX™ Standard Kit (Biolegend) according to the manufacturer's instructions.
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3

Quantification of LTB4 and IL-1β in Tumors

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Subcutaneous tumors were homogenized in 500 ul 1x PBS buffer containing 10uM Indomethacin using Omni GLH general homogenizer. The homogenates were centrifuged at 14000 g for 10 min and LTB4 levels in the supernatants were quantified. The LTB4 levels were normalized to the amount of protein in the supernatants measured by Themo Sceintific Pierce BCA protein assay kit following manufacturer's instructions. LTB4 in the tumor homogenate supernatant was expressed as pg/mg of protein. LTB4 in cell culture supernatants, BALF, air pouch lavage and subcutaneous tumors was measured using LTB4 EIA Kit (Cayman Chemical) according to the manufacturer's instructions. IL-1β in cell culture supernatants was measured using Mouse IL-1β ELISA MAX™ Standard Kit (Biolegend) according to the manufacturer's instructions.
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4

Enzymatic Activity of LTA4H Epoxide Hydrolase

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The enzymatic activity of LTA4H epoxide hydrolase was determined by monitoring the hydrolysis of LTA4. The enzyme (30 ng) was incubated with the indicated concentrations of bufexamac at room temperature for 10 min in 96-well plates in 10 mM NaH2PO4/Na2HPO4, pH = 7.4, containing 2 mg/mL bovine serum albumin (BSA). LTA4 was added to initiate the reaction. The production of LTB4 was determined by a commercial LTB4 EIA kit (Cayman Chemical, Ann Arbor, MI, USA) according to the manufacturer’s instruction.
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5

LTB4 ELISA Assay Protocol

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LTB4 EIA kit, using monoclonal antibody produced in mice against LTB4 from rabbit, and LTB4 were from Cayman Chemical (USA). CII from chicken, dimethyl sulfoxide, Freund's incomplete adjuvant, HEPES buffer, LTA4, Turk's fluid, Trypan, and NaCl were from Sigma-Aldrich (USA). Acetic acid was from Labsynth Produtos para Laboratorio Ltd. (Brazil). Glycerol was from USB Corporation (USA). Ketamine 5% (Vetanarcol) was from König do Brasil (Brazil). Percoll (ρ = 1.077 mg/mL) was from GE Healthcare (USA). Sodium heparin 25,000 UI/5 mL (Liquemine) was from Roche (Brazil). Xylazine 2.3% (Anasedan) was from Sespo Ind. Co., Ltd., Vetbrands Division (Brazil). All other chemicals and reagents were of analytical grade and purchased from Merck KGaA (Germany).
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6

Intestinal LTB4 Quantification in Apc Mutant Mice

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For measuring levels of LTB4, distal intestine tumors from ACKR2−/−ApcMin/+, ACKR2−/−SA−/−ApcMin/+, and ACKR2−/− BLT1−/−ApcMin/+ were resected into 500 μL of cold indomethacin (10 μmol/L) containing 1× PBS and homogenized immediately using a Omni GLH general homogenizer. The homogenates were centrifuged at 14,000× g for 10 minutes, and the LTB4 levels in the supernatant were quantified using a LTB4 EIA kit (Cayman Chemical). The LTB4 levels were normalized to the amount of protein in the homogenates (measured by BCA protein assay, Thermo Fisher Scientific).
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7

Validating LTB4 Measurement in AAA Tissue

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A pilot study was performed on a set of AAA tissue homogenates for validation of LTB4 measurements using ELISA after protein isolation. Lipid extractions were performed according to the SPE (C-18) column purification protocol described in the LTB4 EIA protocol by Cayman Chemicals (LTB4 EIA kit, Cayman Chemicals LtD, Michigan, USA). This protocol is designed for lipid extraction for lipid analysis. Non-purified samples were used for comparison. Dilution series were performed on non-purified and purified samples for accuracy of LTB4 measurements. In addition, column purifications were combined with LTB4 spiking (50 pg/ml) to validate accuracy of LTB4 measurements. All results are described in figure 1.
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8

Protein Precipitation and Quantification

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Ethanol was used to precipitate protein from cell culture medium before analysis using either the enzyme immuno-assays (EIAs) LTC/D/E4 Biotrak EIA System (Amersham) or the LTB4 EIA Kit (Cayman Chemical) according to the manufacturer’s instructions.
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9

Quantifying Inflammatory Mediators

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LTB4, IL-1β, IL-6, and TNF-α in the cell culture supernatants were measured using LTB4 EIA Kit (Cayman Chemicals) and Mouse IL-1β, IL-6, and TNF-α ELISA MAX Standard Kit (Biolegend), respectively, using manufacturer's instructions. Absorbance was measured using a BioTek microplate reader.
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10

Quantifying Inflammatory Mediators

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Levels of LTB4 and IL-1β in the supernatants of cell culture and air pouch lavage fluid were measured using LTB4 EIA Kit (Cayman Chemicals) and Mouse IL-1β ELISA MAX Standard Kit (Biolegend) respectively, using manufacturer’s instructions. Absorbance was measured using a BioTek (Winooski, VT) microplate reader at 405nm and 450nm for LTB4 and IL-1β respectively.
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