The Effect of Green Tea Leaf Extract on Spatial Memory Function and Superoxyde Dismutase Enzyme Activity in Mice with D-galactose Induced Dimentia

Abstract

Background:�Oxidative stress�and�inflammation�play�an important role in�pathogenesis of�brain aging�and neurodegenerative diseases such as�Alzheimer. Green tea�has been shown to have antioxidant, anti-inflammatory, anticancer, and neuroprotective�activity. Objectives: to determine the effect of green tea extract on�spatial memory function and superoxide dismutase�enzyme activity in mice with D-galactose induced dementiaMethods:�An experimental study using "post test only control group design".�Twenty male�BALB/c Mice aged 6-8�weeks were divided into�4�groups.�Negative control group�(NG)�was induced by subcutaneous injection of�D-galactose�(150�mg/kg BW)�once�daily for�6�weeks.�GT-90, GT-270,�GT-540�were induced by�D-galactose�and orally administered with 90, 270, and 540 mg/kg BW of�green tea extract�once daily for 6 weeks.�The spatial memory functions were assessed using Morris water maze and�SOD enzyme activities�were evaluated using ELISA.�One-way Anova and Kruskal-Wallis were used for statistical analysis.�Results: mean�percentage of latency time in the GT-90�(35.29�(SD=�2.69)%),�GT-270�(35.28 (SD= 2.62)%), and�GT-540�(35.62�(SD=5.05)%)�were�significantly�higher compared to that of NG�(20.38�(SD =�3.21)%), p�<0.05). SOD enzyme activity in the�GT-270�(0.78 (SD = 0.07) U/ml)�was�significantly�higher�compared to that of NG�(0.51 (SD = 0.01) U�ml), p= 0.004).Conclusion:�Green tea extract�may�improve�spatial memory�function�and�the activity of�superoxide dismutase�enzyme in mice�with D-galactose induced�dementia.