Apocynin ameliorates cognitive deficits in streptozotocin-induced diabetic rats

L. Xianchu, L. Kang, D. Beiwan, P. Huan, L. Ming
2021 Bratislava Medical Journal  
The aim was to investigate the improvement properties of apocynin and its potential mechanism on diabetes-associated cognitive decline. In this study, the model of diabetic rat was established by STZ (50 mg/kg) and treated with apocynin (16 mg/kg/d for 12 weeks). The cognitive ability was evaluated by Morris water maze test. The indicators of oxidative stress (SOD and MDA) were analyzed by spectrophotometer. The inflammatory cytokines were measured by real time-PCR and ELISA. The protein
more » ... ions of Nrf-2, HO-1, Bcl-2 and Bax were determined by Western blot. Treatment with apocynin ameliorated diabetes-related learning and memory injury, as represented by decreasing escape latency and enhancement of the number of times of crossing platform, in the Morris water maze test. In hippocampus, apocynin markedly augmented SOD activity and inhibited MDA level to alleviate oxidative stress. Moreover, apocynin obviously relieved inflammatory reaction by suppressing TNF-α, IL-1β and IL-6 concentrations. Concomitantly, apocynin also statistically enhanced Nrf-2 and HO-1 protein expression to improve DACD. Lastly, apocynin notably ameliorated Bax/Bcl-2 ratio by regulating Bax and Bcl-2 protein expression to mitigate apoptosis. Our results have shown that apocynin may be a valid therapeutic agent against DACD via modulation of antioxidant, anti-inflammatory, and anti-apoptosis (Tab. 1, Fig. 18, Ref. 35).
doi:10.4149/bll_2021_010 pmid:33393325 fatcat:owpyp7yrxrg2nlncyac7hwnjcm