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01-12-2020 | Shock | Research

Stress-induced NLRP3 inflammasome activation negatively regulates fear memory in mice

Authors: Yuan Dong, Shuoshuo Li, Yiming Lu, Xiaoheng Li, Yajin Liao, Zhixin Peng, Yunfeng Li, Lin Hou, Zengqiang Yuan, Jinbo Cheng

Published in: Journal of Neuroinflammation | Issue 1/2020

Abstract

Background

Persistent inflammation dysregulation and cognitive decline have been associated with several trauma- and stress-related disorders such as posttraumatic stress disorder (PTSD) and anxiety disorder. Despite the abundant discoveries of neuroinflammation in such disorders, the underlying mechanisms still remain unclear.

Method

Wild-type and Nlrp3^−/− mice were exposed to the electric foot shocks in the contextual fear memory paradigm. Three hours after the electric foot shocks, activation of the NLRP3 inflammasome was investigated through immunoblotting and ELISA. Microglia were isolated and analyzed by quantitative real-time PCR. Hippocampal tissues were collected 3 h and 72 h after the electric foot shocks and subjected to RNA sequencing. MCC950 was administrated to mice via intraperitoneal (i.p.) injection. Interleukin-1 receptor antagonist (IL-ra) and interleukin-1β (IL-1β) were delivered via intracerebroventricular (i.c.v.) infusion. Contextual fear responses of mice were tested on 4 consecutive days (test days 1-4) starting at 48 h after the electric foot shocks. Anxiety-like behaviors were examined by elevated plus maze and open-field test.

Results

We demonstrated that, in the contextual fear memory paradigm, the NLRP3 inflammasome was activated 3 h after electric foot shocks. We also found an upregulation in toll-like receptor and RIG-I-like receptor signaling, and a decrease in postsynaptic density (PSD) related proteins, such as PSD95 and Shank proteins, in the hippocampus 72 h after the electric foot shocks, indicating an association between neuroinflammation and PSD protein loss after stress encounter. Meanwhile, Nlrp3 knockout could significantly prevent both neuroinflammation and loss of PSD-related proteins, suggesting a possible protective role of NLRP3 deletion during this process. For further studies, we demonstrated that both genetic knockout and pharmaceutical inhibition of the NLRP3 inflammasome remarkably enhanced the extinction of contextual fear memory and attenuated anxiety-like behavior caused by electric foot shocks. Moreover, cytokine IL-1β administration inhibited the extinction of contextual fear memory. Meanwhile, IL-1ra significantly enhanced the extinction of contextual fear memory and attenuated anxiety-like behavior.

Conclusion

Taken together, our data revealed the pivotal role of NLRP3 inflammasome activation in the regulation of fear memory and the development of PTSD and anxiety disorder, providing a novel target for the clinical treatment of such disorders.

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Title: Stress-induced NLRP3 inflammasome activation negatively regulates fear memory in mice
Authors: Yuan Dong
Shuoshuo Li
Yiming Lu
Xiaoheng Li
Yajin Liao
Zhixin Peng
Yunfeng Li
Lin Hou
Zengqiang Yuan
Jinbo Cheng
Publication date: 01-12-2020
Publisher: BioMed Central
Keywords: Shock
Shock
Anxiety
Published in: Journal of Neuroinflammation / Issue 1/2020
Electronic ISSN: 1742-2094
DOI: https://doi.org/10.1186/s12974-020-01842-0

2024 ASCO Annual Meeting

Springer Medicine

Stress-induced NLRP3 inflammasome activation negatively regulates fear memory in mice

Abstract

Background

Method

Results

Conclusion

2024 ASCO Annual Meeting

Springer Medicine

Abstract

Background

Method

Results

Conclusion

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