The experiment was performed as described [23 (link)]. NF-κB promoter region was cloned into pGL3-based vectors to construct Luciferase reporter plasmid. The reporter plasmid was transfected into RA-FLS-Ctrl or RA-FLS-TRIP groups using the Lipofectamine 2000 (Invitrogen, Shanghai, China), and phRL-TK plasmid was cotransfected as internal control. 36 hours later, the Luciferase activities were measured on a SpectraMax M5 reader (Molecular Devices, California, USA) using the Dual-Luciferase Reporter Assay System (Promega, Madison, USA).
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