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• W3029036013 abstract "Protease activity correlates with depressive or suicidal behaviors, with calpain activation being especially implicated in depression-like behaviors. However, the role of calpain in depression-like behaviors is currently unknown. In this study, the lipopolysaccharide (LPS) - and chronic unpredictable mild stress (CUMS)-induced depression models were used to evaluate the antidepressant effects of calpain inhibitors. Potential mechanisms were determined using pharmacological and biochemical methods. We found that i. p. injection of a calpain inhibitor, calpeptin, prevented LPS-induced depression-like behaviors, activation of astrocytes, inflammation, and reduction of synaptic protein expression levels. LPS injection (i.p.) promoted calpain activity, which degraded suprachiasmatic nucleus circadian oscillatory protein (SCOP). This led to the activation of ERK and nuclear translocation of nuclear factor kappa-B (NF-κB), the promotion of cytokine release, and the reduction of Arc, and PSD95 expression in the hippocampus. In contrast, i. p. injection of calpeptin blocked these changes. Furthermore, intraventricular injection of calpain inhibitor (PD150606) or an ERK inhibitor ameliorated the LPS-induced depression-like behaviors. Administration of calpeptin also remedied CUMS-induced depression-like behaviors, degradation of SCOP, activation of astrocytes, and reduction of synaptic protein expression levels. Finally, we also demonstrated that memantine, an N-methyl-d-aspartic acid (NMDA) receptor antagonist blocks LPS-induced degradation of SCOP. Together, our results show that calpain inhibition ameliorates depression-like behaviors, probably by reducing inflammation and promoting synaptic protein expression in the hippocampus." @default.
• W3029036013 created "2020-06-05" @default.
• W3029036013 creator A5010662190 @default.
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• W3029036013 date "2020-09-01" @default.
• W3029036013 modified "2023-10-17" @default.
• W3029036013 title "Calpain inhibition ameliorates depression-like behaviors by reducing inflammation and promoting synaptic protein expression in the hippocampus" @default.
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• W3029036013 doi "https://doi.org/10.1016/j.neuropharm.2020.108175" @default.
• W3029036013 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32492450" @default.
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