X-11-5-27, a daidzein derivative, inhibits NLRP3 inflammasome activity via promoting autophagy.

NLRP3 inflammasome is a cytoplasmic multiprotein complex which plays a critical role in response to infection or injury, however, aberrant NLRP3 inflammasome activation is deleterious. In our study, we investigate the inhibitory effect of X-11-5-27, a daidzein derivative, on the NLRP3 inflammasome. The results showed that the activation of NLRP3 inflammasome was inhibited by X-11-5-27 in a dose-dependent manner, followed by a decrease in the cleavage of caspase-1 and maturation of IL-1ß. Furthermore, we found that X-11-5-27 significantly restrained the formation of NLRP3 inflammasome. At the same time, X-11-5-27 time- and dose-dependently decreased the production of ROS and superoxide. In addition, X-11-5-27 enhanced the activity of SOD to scavenge ROS release. This inhibitory effect of X-11-5-27 was due to the protection of mitochondrial homeostasis and was abolished after the treatment of rotenone. Notably, X-11-5-27 was found to trigger autophagy in macrophages, which in turn inhibited the NLRP3 inflammasome activation. Moreover, the phosphorylation states of the proteins in PI3K/AKT/mTOR signaling pathway were dramatically decreased after X-11-5-27 treatment. In conclusion, our results demonstrate that autophagy-mediated ROS reduction is responsible for X-11-5-27-induced NLRP3 flammasome inactivation. And these results may help guide decisions regarding the use of X-11-5-27 in relieving the inflammasome-driven hyper-inflammation.