Abstract
Astrocytes play important roles in the development of depression. As a promising target for antidepressant development, sigma-1 receptor (Sig-1R) is reported to promote activation of astrocyte in chronic stress-induced depression in our previous study. However, astrocytes are hyper-activated in inflammation-induced depression, raising concerns of whether stimulation of astrocytic Sig-1R would exert antidepressant-like effect in inflammation-induced depression. Here we reported that specific stimulation of astrocytic Sig-1R using adeno-associated virus (AAV) significantly attenuated lipopolysaccharide (LPS)- induced depressive-like behavior in the forced swim test (FST), tail suspension test (TST), sucrose preference test, and improved the memory function in novel object recognition test. Besides, specific stimulation of astrocytic Sig-1R decreased the activation of astrocyte and microglia, as well as increased brain-derived neurotrophic factor (BDNF) in LPS-induced depression. In primary cultured astrocytes, overexpression of Sig-1R also reduced the expression of IL-1β, TNF-α, iNOS during inflammation-treated astrocyte. Taken together, the results suggest that specific stimulation of astrocytic Sig-1R ameliorates inflammation-i...Continue Reading
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