MyD88 wild-type and its corresponding mutant were built into a pGL3-basic luciferase vector (2 μg/mL; Shanghai GenePharma, Shanghai, China) to generate the luciferase reporter plasmids. Cells at the third passage were inoculated onto 24 well plates at a density of 4 × 104 cells/well and cultured at 37°C. When the cells reached ~ 70% confluence, they were co-transfected with luciferase reporter plasmids, miR-143-3p mimic, or NC mimic using Lipofectamine 2000 (Invitrogen; Thermo Fisher Scientific) according to the manufacturer’s instructions. Luciferase activity was examined using a dual-luciferase reporter assay kit (cat. no. E1910; Promega Corporation, Madison, WI, USA) following transfection for 24 h [29 (link)].