Background
Microtubule dynamics plays a crucial role in the spatial arrangement of cell organelles and activation of the NLRP3 inflammasome.
Purpose
This study aimed to explore whether microtubule affinity regulating kinase 4 (MARK4) can be a therapeutic target of periodontitis by affecting microtubule dynamics and NLRP3 inflammasome-mediated pyroptosis in macrophages.
Materials and Methods
The NLRP3 inflammasome-related genes and MARK4 were measured in the healthy and inflamed
human gingival tissues. Bone marrow-derived macrophages (BMDMs) were infected with Porphyromonas gingivalis,
while the MARK4 inhibitors (OTSSP167 and Compound 50) and small interference RNA
were utilized to restrain MARK4. Apoptosis-associated speck-like protein (ASC)
speck was detected by confocal, and levels of interleukin-1β (IL-1β), as well
as IL-18, were assessed by ELISA.
Results
Increased staining and transcription of MARK4, NLRP3, ASC, and Caspase-1 were observed in the inflamed gingiva.
P. gingivalis
infection promoted MARK4 expression and the NLRP3 inflammasome in BMDMs. Inhibition of MARK4 decreased LDH release, IL-1β and IL-18 production, ASC speck formation, and the pyroptosis-related genes transcription. Furthermore, MARK4 inhibition reduced microtubule polymerization and acetylation in
P. gingivalis-
infected BMDMs.
Conclusions
MARK4 promoted NLRP3 inflammasome activation and pyroptosis in
P. gingivalis-
infected BMDMs by affecting microtubule dynamics. MARK4 inhibition might be a potential target in regulating the NLRP3 inflammasome during periodontitis progress.