Abstract
Neuronal dysfunction and loss are thought to be one of the causes of cognitive impairment in Alzheimer's disease (AD), but the specific mechanism of neuronal loss in the pathogenesis of AD remains controversial. This study explored the role of NLRP3 inflammasome-induced neuronal pyroptosis in neuronal loss of AD, and pioneered the use of NLRP3 inhibitor MCC950 to intervene in the treatment of senescence-accelerated mouse prone 8 (SAMP8) mice. In vitro, human primary neurons (HPNs) pretreated with MCC950 were stimulated with amyloid-β1–42 (Aβ1–42), and it was found that MCC950 significantly reduced the neurotoxicity of Aβ1–42 by inhibiting neuronal pyroptosis. In vivo, SAMP8 mice were randomly divided into vehicle-treated group and MCC950-treated group, and it was found that MCC950 also played a positive role in treatment. The intervention of MCC950 improved the spatial memory ability and brain histological morphology of SAMP8 mice, and reduced the deposition of amyloid-β in the brain. Furthermore, MCC950 was found to inhibit the overexpressions of NLRP3, caspase-1, and GSDMD, which were the response factors of pyroptosis in SAMP8 mouse neurons, by immunofluorescence staining. In this study, we found that neuronal pyroptosis induced by the NLRP3/caspase-1/GSDMD axis was an important factor in neuronal loss of AD, and revealed that MCC950 might be a potential AD therapeutic agent.
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Funding
This work was supported by Grants from National Natural Science Foundation of China (Grant Nos. 81671623, 81873880, 81501417), and Medical Scientific Research Foundation of Guangdong Province (No. A2017296).
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JL: investigation, writing–original draft preparation; LZ: methodology, writing–original draft preparation; XL: data curation, software; JL: investigation, methodology; YH and ES: conceptualization, supervision, writing-reviewing and editing.
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Li, J., Zhuang, L., Luo, X. et al. Protection of MCC950 against Alzheimer's disease via inhibiting neuronal pyroptosis in SAMP8 mice. Exp Brain Res 238, 2603–2614 (2020). https://doi.org/10.1007/s00221-020-05916-6
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DOI: https://doi.org/10.1007/s00221-020-05916-6