Effects of amycenone on serum levels of tumor necrosis factor-α, interleukin-10, and depression-like behavior in mice after lipopolysaccharide administration

Accumulating evidence suggests that inflammation plays a role in the pathophysiology of depression and that anti-inflammatory substances have antidepressant effects. Amycenone is obtained from extracts of the Yamabushitake (Hericium erinaceum). The purpose of this study is to examine whether amycenone shows anti-inflammatory and antidepressant effects in an inflammation-induced mouse model of depression. First, we examined the effects of amycenone on the serum levels of the pro-inflammatory cytokine, tumor necrosis factor-alpha (TNF-alpha), and the anti-inflammatory cytokine, interleukin-10 (IL-10), after intraperitoneal administration of the bacterial endotoxin lipopolysaccharide (LPS). Oral administration of amycenone (50, 100, or 200 mg/kg) markedly blocked an increase in the serum TNF-alpha levels after a single administration of LPS (0.5 mg/kg). Furthermore, amycenone (200 mg/kg) markedly increased the serum IL-10 levels by a single administration of LPS (0.5 mg/kg). Next, we examined the effects of amycenone on depression-like behaviors in the tail-suspension test (TST) and forced swimming test (FST). Pretreatment with amycenone (200 mg/kg) significantly attenuated LPS (0.5 mg/kg)-induced increase of the immobility time by the TST and FST, indicating antidepressant effects of amycenone. In addition, oral administration of paroxetine (30 mg/kg) showed anti-inflammatory and antidepressant effects in the same model. These findings suggest that amycenone has antidepressant effects in LPS-induced inflammation model of depression. Therefore, amycenone could represent a potential supplement to prevent inflammation-related depression. (C) 2015 Elsevier Inc. All rights reserved.