Evaluating the potential effects of apigenin on memory, anxiety, and social interaction amelioration after social isolation stress

Abstract

Vigorous research confirmed the anti-inflammatory, antioxidant, and antidementia effects of apigenin (Api). The present study evaluated the beneficial impacts of Api administration on behaviour, brain-derived neurotrophic factor (BDNF), Interleukin 6 (IL-6), oxidative stress, and inflammation induced by social isolation (SI) stress in rats. For this purpose, rats underwent a 28-day SI period followed by a 4-week oral Api treatment (50 mg/kg/day, PO). On Day 56, behaviour tests were performed, including an elevated plus maze (EPM), Morris water maze (MWM), and three-chamber social tests. The oxidative stress markers, IL-6, and BDNF levels were measured in the hippocampus. Our results showed that SI stress caused an increase in anxiety and a decrease in spatial memory, sociability, and social preference index. In addition, SI stress increased hippocampal levels of IL-6 and malondialdehyde (MDA) content, whereas it reduced the hippocampal BDNF level and superoxide dismutase (SOD) activities. Our study indicated that Api attenuates anxiety and causes improvements in spatial memory and social interaction. These desirable effects of Api might be related to amelioration in the BDNF level, IL-6, and oxidative stress biomarkers in the hippocampus.