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7 protocols using ionomycin

1

Calcium Signaling Pathway Modulation

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Ionomycin was purchased from Adipogen; Cyclopiazonic Acid (CPA) was obtained from Tocris; Pluronic-F12 from Biotium and Life Technologies; Fluo4-AM from Life Technologies; BTP-2 from EMD-Millipore; 4,4'-diisothiocyano-2,2'-stilbenedisulfonic acid (DIDS) from Sigma.
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2

Flow Cytometric Analysis of CXCL12-Induced Calcium Flux

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Cells were harvested and resuspended in 5mL calcium loading buffer (RPMI + 25mM HEPES) at a density of 2 x 106 cells per ml. Cells were labeled with 1μM Fluo-4AM (Invitrogen, Carlsbad, CA) for 30 minutes at 37°C in the dark with gentle agitation every 10 minutes. Following incubation, samples were washed with calcium loading buffer, centrifuged for 5 minutes at 1000 rpm, and then resuspended in 600 μl calcium loading buffer. Cells were analyzed by flow cytometry, with cells collected for 20 seconds to establish a baseline, and then samples were treated with 100 ng/ml CXCL12 and cells collected for an additional 80 seconds. The calcium ionophore ionomycin (Adipogen, San Diego, CA) was used at 1 mg/ml as a positive control for Fluo-4 loading, and PBS served as a vehicle control. Data was analyzed using FlowJo software (FlowJo, Ashland, Oregon).
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3

Flow Cytometric Analysis of PBMC Responses to PRRSV

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PBMCs were plated at 500,000 cells/well and allowed to rest overnight. The following day, cells were stimulated with either media (MOCK), NC174, NADC20, NADC30, or VR2332 (MOI of 0.1); Phorbol 12-myristate 13-acetate (PMA, 5 ng/mL, Alfa Aesar, Ward Hill, MA, USA)/Ionomycin (500 ng/mL, AdipoGen, San Diego, CA, USA) was used as a positive control. Plates were cultured for 18 h; Monensin (5 μg/mL, Alfa Aesar) was added for the last 4 h of culture. Eight replicates were then pooled and stained for flow cytometry analysis according to Table 1. Data were acquired on a Cytoflex using the CytExpert software (Beckman Coulter). Data analysis was performed with FlowJo version 10.5.3 (FLOWJO LLC) with gates based upon the FMO controls.
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4

PBMC Stimulation and Flow Cytometry

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The frozen PBMCs were thawed and seeded at a density of 500,000 PBMCs per well in quadruplicate in RPMI-1640 supplemented with 10% FBS and 1X antibiotic-antimycotic (Corning). The cells were stimulated with one of four treatments: Media, MLV, LP, or HP PRRSV virus (MOI of 0.1). Phorbol 12-myristate 13-acetate (PMA, 5 ng/mL, Alfa Aesar, Ward Hill, MA, USA)/Ionomycin (500 ng/mL, AdipoGen, San Diego, CA, USA) stimulation served as the positive control. The plates were cultured for 18 h and Monensin (5 µg/mL, Alfa Aesar) was added for the last 4 h of culture. The replicates were then pooled and stained in accordance with Figure S4. The cells were recorded on a Cytoflex using the CytExpert software (Beckman Coulter). The data analysis was performed with FlowJo version 10.5.3 (FLOWJO LLC) with gates based upon the FMO controls.
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5

Osteoblast Differentiation and Clodronate Treatment

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MC3T3‐E1 cells, a mouse calvarial osteoblast cell line, were obtained from Riken Bio Resource Center (Tsukuba, Japan). MC3T3‐E1 cells were maintained in α‐minimal essential medium (12571‐063; Gibco‐BRL, Grand, Island, NY, USA) supplemented with 10% FBS (Biosera Nuaillé, France) and 100 U·mL−1 penicillin–streptomycin (FUJIFILM Wako Pure Chemical Corporation, Osaka, Japan). Osteoblast differentiation was induced by culturing cells in an osteogenic medium containing 50 μg·mL−1 ascorbic acid (FUJIFILM Wako Pure Chemical Corporation) and 10 mm β‐glycerophosphate (Sigma‐Aldrich, St. Louis, MO, USA) for 7 days. Cells were treated with 1, or 10 μm clodronate (Sigma‐Aldrich). Ionomycin (AdipoGen Life Sciences, San Diego, CA, USA) treatments were performed at 1 μm. Brefeldin A (Cayman Chemical, Ann Arbor, MI, USA) was used at 10 μm. HEK293T cells (Takara Bio, Shiga, Japan) were cultured in Dulbecco's modified Eagle's medium (DMEM) (12320‐032; Gibco‐BRL) supplemented with 10% FBS (Biosera Nuaillé) and 100 U·mL−1 penicillin–streptomycin (FUJIFILM Wako Pure Chemical Corporation).
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6

NLRP3 Inflammasome Activation in LPS-Stimulated Cells

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LPS from Escherichia coli O111:B4 was purchased from Sigma–Aldrich. The cathepsin B inhibitor Ca074Me was obtained from the Peptide Institute. Nigericin, ionomycin, and the NLRP3 inhibitor, MCC950, were obtained from AdipoGen Life Sciences. The caspase-1 inhibitor Z-YVAD-fmk and pan-caspase inhibitor Z-VAD-fmk were purchased from Abcam. The actin polymerization inhibitor cytochalasin D was obtained from Cayman Chemical and was used as a phagocytosis inhibitor. All inhibitors were dissolved in DMSO.
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7

Investigating Protein Regulation in HEK293 Cells

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Dimethyl sulfoxide (DMSO) was from Thermo Fisher Scientific (catalog: BP231–100). Tetrodotoxin citrate (TTX) was from Cayman Chemicals (catalog: 14964). Ionomycin was from AdipoGen (catalog: AG-CN2–0416-M001). The antibodies used in this study were purchased from Cell Signaling (anti-Nedd4–2, RRID: AB_1904063; anti-pan-14-3-3, RRID: AB_10860606; anti-Myc, RRID: AB_490778; anti-N-Cadherin, RRID: AB_2798427; anti-HA, RRID: AB_10691311, and anti-Ub, RRID: AB_331292), Millipore (anti-GluA1-N-terminus, RRID: AB_1977459), Santa Cruz Biotechnology (anti-α-tubulin, RRID: AB_628411), and Proteintech (anti-Gapdh, RRID: AB_2107436), and ABclonal (anti-PPP3CA, RRID: AB_2758155). Human embryonic kidney (HEK 293) cells were from ATCC (ATCC #CRL-1573, RRID: CVCL_0045). HEK 293 cell line is not listed as a commonly misidentified cell line by the International Cell Line Authentication Committee (ICLAC) and was not authenticated in this study. Cells were cultured in Dulbecco’s Modified Eagle Medium (Sigma, catalog: 10017CV) with 10% Fetal Bovine Serum (JM Bioscience, catalog: 100–500). Cells were used between passages 4 to 25 and kept at 37°C in a humidified incubator containing 5% CO2.
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