The inflammatory factor concentrations measured by enzyme-linked immunosorbent assay (ELISA). Medium supernatant was collected 24 h after the stimulation for ELISA assays. The data are presented as mean ± standard deviation (SD). The error bars represent standard deviation, and the asterisk indicates statistical difference (n = 6, * p < 0.05) between the indicated columns, based on one-way analysis of variance followed by Duncan’s multiple comparison test. IL-1β, interleukin-1β; IL-6, interleukin-6; IL-8, interleukin-8; TNF-α, tumor necrosis factor-α; CXCL1, chemokine (C-X-C motif) ligand 1; CXCL6, chemokine (C-X-C motif) ligand 6; CON, control group; LPS, lipopolysaccharide group; PLL, the group of co-stimulation with peptidoglycan (PGN), lipoteichoic acid (LTA), and LPS.