For transfection, the HaCaT cells were plated on six-well, flat-bottom plates at a seeding density of 3 × 105, and grown to 80% confluence. For transient overexpression of LL-37, the LL-37 plasmid was transfected into HaCaT cells for 6 h. An empty vector was used as the control. The instructions to complete cell transfection were followed. Then, we replaced the medium with fresh serum-free α-MEM. The cells transfected with plasmids were used in subsequent experiments.
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