Effects of adiponectin on the anxiety and memory impairment in triple transgenic Alzheimer's disease model mice

Abstract

To investigate the effects of adiponectin (APN) on anxiety and memory impairment of 9-month-old triple transgenic Alzheimer's disease (3xTg-AD) model mice. The 9-month-old 3xTg-AD mice and C57BL/6J mice were randomly divided into four groups (n=8 for each group):Wild type(WT)+Saline, 3xTg-AD +Saline, WT+APN and 3xTg-AD +APN group. All mice were implanted cannula in lateral ventricle and each mouse was intracerebroventricular injected with adiponectin or saline under free moving condition after 7 days recovery. The anxiety and memory ability of each mouse were observed by using open field test, object recognition task and Y-maze test. ①In the open field test, compared to WT+Saline group, the time of 3xTg-AD +Saline mice spent in center was significantly decreased, and the time spent in periphery was obviously increased. However, APN treatment effectively reversed the phenomenon appeared in 3xTg-AD mice, indicating that APN could alleviate the anxiety observed in 3xTg-AD mice. ②In novel object recognition task, the discrimination index of 3xTg-AD+Saline group was (-16.7±10.1)%, significantly lower than (18.0±8.2)% in WT+Saline group (P<0.01) and (15.7±8.8)% in 3xTg-AD+APN group (P<0.01), which indicated that APN could effectively prevent the recognition memory impairment in 3xTg mice. ③In Y-maze test, the spontaneous alternation rate of 3xTg-AD +Saline group was (40.0±1.7)%,significantly lower than (56.6±4.6)% in WT+Saline group and (53.9±5.6)% in 3xTg-AD +APN group (P<0.01), which indicated that APN could prevent working memory impairment in 3xTg-AD mice. Adiponectin could effectively alleviate the anxiety and reverse the impairment of recognition memory and working memory of 9-month-old 3xTg-AD mice, and might play an important role in the prevention and treatment of AD.