Cells were pretreated with various inhibitors (Sigma-Aldrich) such as NF-κB-specific inhibitor: Bay11-7085 (20 μM), STAT3-specific inhibitor: S3I-201 (20 μM), and ERK1/2-specific inhibitor: PD98059 (20 μM). After 1 h, the cells were treated and co-cultured with METH for 24 h. Cells were transfected with control siRNA (Cat no: sc-37007, Santa Cruz, CA, USA) and ERK-MAPK siRNA (Cat no: 6560, Cell Signaling Technology, MA, USA) using Lipofectamine RNAiMAX transfection reagent (Invitrogen) according to the manufacturer’s instruction.
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