Aeromonas caviae
, an important food-borne pathogen, induces serious invasive infections and inflammation. The pro-inflammatory IL-1β functions against pathogenic infections and is elevated in various
Aeromonas
infection cases. However, the molecular mechanism of
A. caviae
-mediated IL-1β secretion remains unknown. In this study, mouse macrophages (PMs) were used to establish
A. caviae
infection model and multiple strategies were utilized to explore the mechanism of IL-1β secretion. IL-1β was elevated in
A. caviae
infected murine serum, PMs lysates or supernatants. This process triggered NLRP3 levels upregulation, ASC oligomerization, as well as dot gathering of NLRP3 and speck-like signals of ASC in the cytoplasm. MCC950 blocked
A. caviae
mediated IL-1β release. Meanwhile, NLRP3 inflammasome mediated the release of IL-1β in dose- and time-dependent manners, and the release of IL-1β was dependent on active caspase-1, as well as NLRP3 inflammasome was activated by potassium efflux and cathepsin B release ways.
A. caviae
also enhanced TLR2 levels, and deletion of TLR2 obviously decreased IL-1β secretion. What’s more,
A. caviae
resulted in NF-κB p65 nuclear translocation partly in a TLR2-dependent manner. Blocking NF-κB using BAY 11-7082 almost completely inhibited NLRP3 inflammasome first signal pro-IL-1β expression. Blocking TLR2, NF-κB, NLRP3 inflammasome significantly downregulated IL-1β release and TNF-α and IL-6 levels. These data illustrate that
A. caviae
caused IL-1β secretion in PMs is controlled by NLRP3 inflammasome, of which is mediated by NF-κB pathway and is partially dependent on TLR2, providing basis for drugs against
A. caviae
.
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