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2 protocols using p stat1 9167s

1

Neuroblastoma Cell Line Protocol

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Human (LAN-1 and SK-N-SH) NB cell lines were obtained from Dr. Dai Chung (Vanderbilt University). Neuro-2a cells were obtained from American Type Culture Collection (ATCC) (Manassas, Virginia). 9464D cells were derived from spontaneous TH-MYCN tumors70 (link) and obtained from Dr. Yonghzi Cui (National Cancer Institute). Cells were maintained in Dulbecco’s modified Eagle’s medium (GIBCO) supplemented with 10% fetal bovine serum (FBS; Invitrogen, Carlsbad, California) and 1% penicillin/streptomycin (GIBCO). Antibodies against STING (13 647S), p-IRF3 (4997S), IRF3 (4302S), Cleaved-Caspase 3 (9664T), and p-STAT1 (9167S) were purchased from Cell Signaling Technology (Beverly, Massachusetts). Antibodies for β-Actin (A5411) and Caspase (SC 56053) were purchased from Sigma Aldrich (St. Louis, Missouri) and Santa Cruz Biotechnology, respectively. Anti-PD-L1 antibody (BE0101) was purchased from BioXcell (West Lebanon, New Hampshire).
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2

Protein Expression Analysis by WB

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Protein extracts (20-30 µg/sample) were separated by 10% acrylamide gel SDS–PAGE, and immunoblotted with antibodies against p62/SQSTM1 (5114S), Cyclin D1 (5114S), pErk (2978S), CDK4 (12790S), p21 (2946S), pSTAT1 (9167S) from (Cell Signaling Technology) and pc-Jun (PAS-17879) (ThermoFisher Scientific). Actin was used as control (SC-1516, Santa Cruz Biotechnology, Santa Cruz, CA). Membranes were blocked with 5% BSA (Sigma-Aldrich) in Tris-buffered saline, 0.1% Tween 20 and, after incubation with primary antibodies, signals were visualized with IR-dye-conjugated secondary antibodies and scanned using Odyssey imaging system (Li-COR, Lincoln, NE).
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