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Ginkgolide B inactivates the NLRP3 inflammasome by promoting autophagic degradation to improve learning and memory impairment in Alzheimer’s disease

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Abstract

The NLR family, pyrin domain containing 3 (NLRP3) inflammasome drives the progression of Alzheimer’s disease (AD). Ginkgolide B (GB) is a potential anti-inflammatory compound that controls neuro-inflammation. The aim of this study was to evaluate the effect of GB on the NLRP3 inflammasome in AD. The effect of GB on the conversion between the M1 and M2 microglial phenotype was examined using quantitative real-time PCR and immunostaining. Western blotting assays and ELISA were used to detect changes in neuro-inflammation following GB treatment, including the NLRP3 inflammasome pathway and autophagy. In order to evaluate the cognitive function of male senescence-accelerated mouse prone 8 (SAMP8) mice, behavioral tests, including the Morris water maze and novel object recognition tests, were performed. GB significantly decreased the intracellular pro-inflammatory cytokine levels in lipopolysaccharide-treated BV2 cells and improved cognitive behavior in SAMP8 mice. Moreover, GB deactivated the NLRP3 inflammasome, and this effect was dependent on autophagy. Ubiquitination was associated with GB-induced autophagic NLRP3 degradation. These results were further validated in the hippocampus of SAMP8 mice. Thus, GB exerted a neuroprotective effect on the cognitive function of SAMP8 mice by suppressing the activation of NLRP3 inflammasome via autophagic degradation.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the fifth phase of “Project 333” Scientific Research Project Funding Plan of Jiangsu Province (BRA2019238), Medical Key Youth Talents Training Project of Jiangsu Province (QNRC2016367), Xuzhou Science and Technology Plan Project (KC19020) and Science and Technology Development Fund Project of Xuzhou Medical University Affiliated Hospital (XYFM2020024).

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LX and CD were involved with the experimental design and analyzed data; QH and YS performed the animal research; LX performed the other research and wrote the manuscript; DG provided technical support, experimental supervision, and the final revision of the manuscript. All authors have read and approved final version of the manuscript.

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Correspondence to Deqin Geng.

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The authors declare that there are no conflicts of interest.

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All animal procedures were in accordance with the Medical Ethics Committee of Xuzhou Medical University (Jiangsu, China).

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We declare that this manuscript is original, has not been published before and is not currently being considered for publication elsewhere. We confirm that the manuscript has been read and approved by all named authors for publication.

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Shao, L., Dong, C., Geng, D. et al. Ginkgolide B inactivates the NLRP3 inflammasome by promoting autophagic degradation to improve learning and memory impairment in Alzheimer’s disease. Metab Brain Dis 37, 329–341 (2022). https://doi.org/10.1007/s11011-021-00886-2

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  • DOI: https://doi.org/10.1007/s11011-021-00886-2

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