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This study investigated the effects of electroacupuncture (EA) on the depression-like behaviours in a mouse model of chronic restraint stress (CRS) and explored the underlying neural mechanisms. Depression-like behaviours including sucrose preference test (SPT), open field test (OFT) and tail suspension test (TST) were carried out to evaluate the effects of CRS and EA treatment. Using immunohistochemistry to measure the expression of c-Fos. The Nucleus Accumbens Shell (NAc Shell) in C57BL/6J mice were activated or inhibited using Chemogenetics. All the CRS stimulated groups showed lower sucrose preference in the SPT and decreased centre times in the OFT, and increased immobility time in the TST when compared to the normal control. Interestingly, EA at LR3 or HT7 exerted anti-depressant effects, and LR3 EA exhibited a more significant restoration than HT7. Furthermore, EA at LR3 increased expression of c-Fos in the NAc Shell. Chemogenetic inhibition of NAc Shell blocked the effects of EA, whereas enhancement of NAc Shell activity profoundly reversed depressive phenotypes. LR3 EA was effective in alleviating the depressive-like behaviours, and this therapeutic effect was associated with the activation of NAc Shell. Collectively, these findings revealed that EA may represent a promising therapeutic strategy for depression.

Electroacupuncture alleviates depression-like behaviours via a neural mechanism involving activation of Nucleus Accumbens Shell