[HTML][HTML] Neutrophils facilitate prolonged inflammasome response in the DAMP-rich inflammatory milieu

S Son, SH Yoon, BJ Chae, I Hwang, DW Shim… - Frontiers in …, 2021 - frontiersin.org
S Son, SH Yoon, BJ Chae, I Hwang, DW Shim, YH Choe, YM Hyun, JW Yu
Frontiers in Immunology, 2021frontiersin.org
Aberrant inflammasome activation contributes to various chronic inflammatory diseases;
however, pyroptosis of inflammasome-active cells promptly terminates local inflammasome
response. Molecular mechanisms underlying prolonged inflammasome signaling thus
require further elucidation. Here, we report that neutrophil-specific resistance to pyroptosis
and NLRP3 desensitization can facilitate sustained inflammasome response and interleukin-
1β secretion. Unlike macrophages, inflammasome-activated neutrophils did not undergo …
Aberrant inflammasome activation contributes to various chronic inflammatory diseases; however, pyroptosis of inflammasome-active cells promptly terminates local inflammasome response. Molecular mechanisms underlying prolonged inflammasome signaling thus require further elucidation. Here, we report that neutrophil-specific resistance to pyroptosis and NLRP3 desensitization can facilitate sustained inflammasome response and interleukin-1β secretion. Unlike macrophages, inflammasome-activated neutrophils did not undergo pyroptosis, indicated by using in vitro cell-based assay and in vivo mouse model. Intriguingly, danger-associated molecular patterns (DAMP)-rich milieu in the inflammatory region significantly abrogated NLRP3-activating potential of macrophages, but not of neutrophils. This macrophage-specific NLRP3 desensitization was associated with DAMP-induced mitochondrial depolarization that was not observed in neutrophils due to a lack of SARM1 expression. Indeed, valinomycin-induced compulsory mitochondrial depolarization in neutrophils restored inflammasome-dependent cell death and ATP-induced NLRP3 desensitization in neutrophils. Alongside prolonged inflammasome-activating potential, neutrophils predominantly secreted interleukin-1β rather than other proinflammatory cytokines upon NLRP3 stimulation. Furthermore, inflammasome-activated neutrophils did not trigger efferocytosis-mediated M2 macrophage polarization essential for the initiation of inflammation resolution. Taken together, our results indicate that neutrophils can prolong inflammasome response via mitochondria-dependent resistance to NLRP3 desensitization and function as major interleukin-1β-secreting cells in DAMP-rich inflammatory region.
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