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Curcumin relieves depressive-like behaviors via inhibition of the NLRP3 inflammasome and kynurenine pathway in rats suffering from chronic unpredictable mild stress.
International Immunopharmacology 2018 December 11
Increasing evidence suggests that inflammation is related to the pathophysiology of depression. Curcumin (CUR), which is a natural component extracted from the rhizome of Curcuma longa, seems to be efficacious in depression treatment. Hence, the present study aims to explore whether the anti-depressive effect of curcumin is connected to its anti-inflammatory features. Twenty-one SD rats were randomly divided into three groups, namely, control, CUMS (chronic unpredictable mild stress), and CUMS + CUR. After stress exposure for four weeks, the CUMS group showed depressive-like behaviors, and the curcumin treatment successfully corrected the depressive-like behaviors in stressed rats. Additionally, the curcumin could effectively decrease mRNA expression of proinflammatory cytokines (IL-1β, IL-6, and TNF-α) and suppress NF-κB activation. Curcumin also inhibited the stressed-induced P2X7R/NLRP3 inflammasome axis activation, along with the reduced transformation of pro-IL-1β to mature IL-1β. The stress-induced activation of indolamine-2, 3-dioxygenase (IDO) and an increased kynurenine/tryptophan ratio were also ameliorated by curcumin supplementation. In conclusion, the study revealed that curcumin relieves a depressive-like state through the inhibition of the NLRP3 inflammasome and kynurenine pathway.
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