Abstract
A20 is an anti-inflammatory molecule in nucleus pulposus (NP) cells. The anti-inflammatory properties of A20 are mainly attributed to its ability to suppress the NF-κB pathway. However, A20 can protect cells from death independently of NF-κB regulation. This study aimed to investigate the effects of A20 on pyroptosis and apoptosis of NP cells induced by lipopolysaccharide (LPS). NP cells induced by LPS were used as an in vitro model of the inflammatory environment of the intervertebral disc. Pyroptosis, apoptosis, and mitophagy marker proteins were detected. Then, NP cells were transfected with A20 overexpressed lentivirus or A20-siRNA. Annexin V FITC/PI, Western blotting, and immunofluorescence assays were used to detect the apoptosis, pyroptosis, and mitophagy of NP cells. Furthermore, the expressions of A20, related proteins, and related inflammatory cytokines were detected by western blotting, and ELISA. Apoptosis and pyroptosis of NP cells increased gradually treated with LPS for 12h, 24h, and 48h. Differently, the level of mitophagy increased first and then decreased, and was the highest at LPS treatment for 12h. Overexpression or knockdown of A20 in NP cells revealed that A20 attenuated the pyroptosis, apoptosis, and production of inflammatory cytokines of NP cells induced by LPS, while A20 sponsored mitophagy, reduced ROS production and collapse of mitochondrial membrane potential (ΔΨm). Moreover, A20 also promoted mitochondrial dynamic homeostasis and attenuated LPS-induced excessive mitochondrial fission. Excitingly, inhibition of mitophagy attenuated the effect of A20 on the negative regulation of pyroptosis of NP cells induced by LPS. Pyroptosis was accompanied by a large release of inflammatory cytokines. Inhibition of pyroptosis also significantly reduced apoptosis of NP cells. Finally, The mitochondria-targeted active peptide SS-31 inhibited LPS-induced pyroptosis and ROS production in NP cells. Tosumup, A20 attenuates pyroptosis and apoptosis of NP cells via promoting mitophagy and stabilizing mitochondrial dynamics. Besides, A20 reduces LPS-induced NP cell apoptosis by inhibiting NLRP3 inflammasome-mediated pyroptosis. It provides theoretical support for the reduction of functional NP cell loss in the intervertebral disc through the gene-targeted intervention of A20.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.