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Microtubule-driven spatial arrangement of mitochondria promotes activation of the NLRP3 inflammasome. (Shizuo AKIRA in Nat Immunol)

NLRP3 forms an inflammasome with its adaptor ASC, and its excessive activation can cause inflammatory diseases. However, little is known about the mechanisms that control assembly of the inflammasome complex.

The authors show that microtubules mediated assembly of the NLRP3 inflammasome. Inducers of the NLRP3 inflammasome caused aberrant mitochondrial homeostasis to diminish the concentration of the coenzyme NAD+, which in turn inactivated the NAD+-dependent -tubulin deacetylase sirtuin 2; this resulted in the accumulation of acetylated -tubulin. Acetylated -tubulin mediated the dynein-dependent transport of mitochondria and subsequent apposition of ASC on mitochondria to NLRP3 on the endoplasmic reticulum.

Therefore, in addition to direct activation of NLRP3, the creation of optimal sites for signal transduction by microtubules is required for activation of the entire NLRP3 inflammasome.



Shizuo AKIRA
Host Defense
Immunology Frontier Research Center (WPI-IFReC), Osaka University