Unveiling the Crucial Role of Type IV Secretion System and Motility of in IL-1β Production via NLRP3 Inflammasome Activation in Neutrophils.

is a gram-negative, microaerophilic, and spiral-shaped bacterium and causes gastrointestinal diseases in human. IL-1β is a representative cytokine produced in innate immune cells and is considered to be a key factor in the development of gastrointestinal malignancies. However, the mechanism of IL-1β production by neutrophils during infection is still unknown. We designed this study to identify host and bacterial factors involved in regulation of -induced IL-1β production in neutrophils. We found that -induced IL-1β production is abolished in NLRP3-, ASC-, and caspase-1/11-deficient neutrophils, suggesting essential role for NLRP3 inflammasome in IL-1β response against . Host TLR2, but not TLR4 and Nod2, was also required for transcription of NLRP3 and IL-1β as well as secretion of IL-1β. lacking , a key component of the type IV secretion system (T4SS), induced less IL-1β production in neutrophils than did its isogenic WT strain, whereas and were dispensable. Moreover, T4SS was involved in caspase-1 activation and IL-1β maturation in -infected neutrophils. We also found that FlaA is essential for -mediated IL-1β production in neutrophils, but not dendritic cells. TLR5 and NLRC4 were not required for -induced IL-1β production in neutrophils. Instead, bacterial motility is essential for the production of IL-1β in response to . In conclusion, our study shows that host TLR2 and NLRP3 inflammasome and bacterial T4SS and motility are essential factors for IL-1β production by neutrophils in response to .