Role of TLRs and associated signaling in SLY-negative S. suis strain 89-1591-induced IL-1β production by bmDCs. (A) Percentage of IL-1β production induced 16 h following infection of bmDCs deficient for MyD88, TRIF, TLR2 or TLR4, with regards to wild-type counterparts (normalized to 100%). (B) Percentage of IL-1β production from bmDCs following pretreatment with inhibitors of NF-kB, p38, MEK or JNK and infection with 1 × 106 CFU of strain 89-1591 with regards to vehicle-treated bmDCs (DMSO; normalized to 100%). Data are expressed as mean ± SEM (n = 3). * (p < 0.05) indicates a significant difference with wild-type or vehicle-treated bmDCs.