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7 protocols using zileuton

1

Macrophage Differentiation and Mycobacterial Infection

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Murine bone-marrow cells were cultured for 7 days in either 15% GM-CSF media to generate BMDC or 30% L929 supernatant media to differentiate BMDM and then exposed to H37Rv at an indicated multiplicity of infection (m.o.i.) for 24–48 h and supernatants harvested. In some experiments PGE2 (2 µg ml−1, Sigma), zileuton (20 µM, Tocris), valdecoxib (0.5 µM, Tocris) or recombinant murine IFNβ (20 ng ml−1), IL-1αor IL-1β(10 ng ml−1) or both together (5 ng ml−1 + 5 ng ml−1, R&D Systems, Minneapolis, MN) were added to the cultures.
Human elutriated monocytes were obtained from peripheral blood of healthy cytomegalovirus-negative donors. Monocyte derived macrophages (MDM) were generated by culturing monocytes with media containing M-CSF (60 ng ml−1) for 7 days. Fresh media with indicated growth factors was added every 48 h. Cells were exposed to H37Rv (m.o.i. = 5) in the presence or absence of PGE2 (2 µg ml−1, Sigma), recombinant human IFN-β (10 ng ml−1), IL-1α (10 ng ml−1), IL-1β (10 ng ml−1) or neutralizing anti-hIL1-R1 antibody (20 µg ml−1, R&D Systems, Minneapolis, MN) for 24 h. All recombinant human cytokines were from Peprotech (Rocky Hill, NJ).
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2

Evaluating Inflammatory Responses in Cells

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Zileuton was purchased from Tocris Bioscience (Ellisville, MO, USA). NS1619 and iberiotoxin (IBTX) were obtained from Sigma (St. Louis, MO, USA). Recombinant human VEGF was acquired from R&D Systems (Minneapolis, MN, USA). BrdU assay kit (colorimetric), LTB4 kits, and both of cysteinyl leukotrienes (Cys-LTs) kits and caspACE™ assay kit were obtained from Roche applied science (Penzberg, Germany), Enzo Life Sciences (Seoul, Korea), and Abcam (Cambridge, MA, USA), respectively. PGE2 and 6-keto PGF1α (the stable hydrolysis products of PGI2) were from Enzo Life Science (Seoul, Korea) and Cayman chemicals (Ann Arbor, MI, USA). Specific antibodies against ICAM-1, VCAM-1, eNOSSer1179 and Erg1/2/3, Bcl-2 and Bax were obtained from Santa Cruz Biotechnology (Santa Cruz, CA, USA). All other reagents were purchased from Sigma (St. Louis, MO, USA) unless otherwise noted.
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3

Lipoprotein Depletion and Lipid Signaling Assays

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AA-861, BWA4C, α-tocopherol, linoleic acid, arachidonic acid, dimethyl sulfoxide were from Sigma. CAY10566, Mead acid, dihomo-γ-linolenic acid, erastin, ferrostatin-1, and (1S,3R)-RSL3 were from Cayman Chemical. SC560, SC236, MK886, Zileuton, BAY-X1005, PD146176, and deferoxamine were from Tocris Bioscience. PSI-7977 (Sofosbuvir) and Glecaprevir were from Chemscene. Cell viability was determined using Cell Counting Kit-8 (DOJINDO, Japan). Lipoprotein-deprived serum (LPDS) was prepared by incubating the heat-inactivated FBS with fumed silica (Sigma, S5130) overnight, followed by removal of the silica by centrifugation at 2,000g for 20 min and filtration using a 0.22 μm filter device.
Primary antibodies to SCD (1:500 dilution, #2438) was from Cell Signaling Technology; FADS1 (1:1,000 dilution, #27533) was from Cayman Chemical; FADS2 (1:1,000 dilution, A10270) were from ABclonal; FADS2 (1:1,000 dilution, 28034–1-AP) was from Proteintech; HCV NS3 (1:500, ab13830) was from Abcam; GAPDH was from Wako (1:4,000 dilution, 016–25523). IRDye 680 or 800 secondary antibodies including #926–32211, #926–32212, #926–32214, #926–68020 and #926–68073 (1:20,000) were from LI-COR.
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4

Ferroptosis Inducers and Inhibitors

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Erastin (S7242) and RSL3 (S8155), Lip-1 (S7699), VBIT-4 (S3544), Mitoquinone mesylate (MitoQ, S8978), Decylubiquione (DecylQ, D7911) were purchased from Selleck Chemicals (Houston, TX, USA). Fer-1 (SML0583), Deferoxamine (DFO, D9533), Trolox (238813), z-VAD-FMK (V116), ML385 (SML1833), MitoTEMPO (SML0737) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Zileuton (3308) was from Tocris Bioscience (Bristol, UK). The following antibodies were used: GPx4 (ab125066, Abcam, Cambridge, UK) and Nrf2 (ab62352, Abcam), COXIV (4844, Cell signaling Technology, Danvers, MA, USA), FLAG (F3165, Sigma-Aldrich), α-tubulin (sc-8035, Santa Cruz, Dallas, TX, USA) and β-actin (sc-47778, Santa Cruz).
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5

Zileuton Attenuates MWCNT-Induced Inflammation

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C57BL/6 mice were treated with either vehicle (0.5% methyl-cellulose/0.2% Tween 80 in water) or Zileuton, a 5-lipoxygenase inhibitor (10 mg/Kg, Tocris Bioscience, Minneapolis, MN, United States), by oropharyngeal instillation 3 h before administration of FA21 MWCNT (50 μg). Zileuton treatment was based on the concentration (10 mg/Kg) and protocol used previously by Clarke et al. (2014) (link). Control mice comprised of mice treated with carrier alone. BALF was collected 24 h after MWCNT exposure and the level of inflammation elicited was evaluated by monitoring EPO and cysLT levels.
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6

Cytosolic GPX4 Mutant Expression

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The compound selected from virtual screen was purchased from SPECS with purity of more than 95% (confirmed by SPECS with NMR and LC-MS; data are available on the website http://www.specs.net/). Reagents were purchased from Sigma–Aldrich unless otherwise noted. The pQE-30 bacterial expression plasmid of the U46C mutant of human cytosolic GPX4 (c-GPX4) was a generous gift from Professor Hartmut Kuhn (University Medicine Berlin-Charité, Germany). IPTG, PMSF, DTT, EDTA, and glutathione were from Amresco. Standard compounds for LC-MS/MS were purchased from Cayman Chemical. Calcium ionophore A23187 was obtained from J&K Chemical. Zileuton was purchased from Tocris Bioscience. The Symmetry C18 reverse-phase column (3.5 μm, 2.1 mm × 150 mm) was purchased from Waters Corp. HEK293T cells were received as a gift from Professor Jincai Luo (Peking University, China). The Dual-Glo Luciferase Assay System was from Promega. The pCDNA3.1 plasmid containing the gene encoding firefly luciferase was a generous gift from Professor Peng Chen (Peking University, China). Antibody against GPX4 was obtained from Abcam (no. ab125066). HT-1080 cells were the generous gift of Professor Chu Wang (Peking University, China).
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7

Arachidonic Acid Metabolism Assay

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Human recombinant COX-1, COX-2, 5-LOX, and arachidonic acid (AA) were from Cayman Chemical (Ann Arbor, MI). Cell culture reagents were from American Type Culture Collection or Invitrogen. Collagen fibrils (type I) from equine tendons were obtained from Chrono-Log Corp (Havertown, PA). Zileuton (a 5-LOX inhibitor) was purchased from Tocris Cookson (Minneapolis, MN). The primary and secondary antibody for detecting 5-LOX were purchased from BD Biosciences Pharmingen and Santa Cruz Biotechnology, respectively. Human recombinant IL-1β, bacterial lipopolysaccharide (LPS), and all other chemicals were from Sigma (St. Louis, MO).
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