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Chronic dexamethasone treatment results in hippocampal neurons injury due to activate NLRP1 inflammasome in vitro.

Abstract：

:Neuroinflammation mediated by NLRP-1 inflammasome plays an important role in the pathogenesis of neurodegeneration diseases such as Alzheimer's disease (AD). Chronic glucocorticoids (GCs) exposure has deleterious effect on the structure and function of neurons and was found to be correlated with development and progression of AD. We hypothesize that chronic glucocorticoids may down-regulate the expression of glucocorticoids receptor (GR) and activate NLRP-1 inflammasome in hippocampal neurons, which may promote neuroinflammation and induce neuronal injury. The present results showed that chronic DEX exposure significantly increased LDH release and apoptosis, decreased MAP2 and GR expression in hippocampal neurons. DEX (5μΜ) exposure for 3d significantly increased the expression of NLRP-1, ASC, caspase-1 and IL-1β in the hippocampal neurons and the release of IL-1β and IL-18 in the supernatants. Moreover, DEX (1, 5μΜ) treatment for 3d significantly increased the expression of NF-κB in hippocampal neurons. The GR antagonist, mifepristone (RU486), had protective effects on chronic DEX induced hippocampal neurons injury and NLRP1 inflammasome activation. The results suggest that chronic GCs exposure can decrease GR expression and increase neuroinflammation via NLRP1 inflammasome and promote hippocampal neurons degeneration, which may play an important role in the progression and development of AD.

journal_name

Int Immunopharmacol

journal_title

International immunopharmacology

authors

Zhang B,Zhang Y,Xu T,Yin Y,Huang R,Wang Y,Zhang J,Huang D,Li W

doi

10.1016/j.intimp.2017.05.039

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

222-230

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(17)30221-7

journal_volume

49

pub_type

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