Gngerol in the improvement of Aβ-induced learning and memory impairment

摘要

OBJECTIVE To investigate the influence of gingerol on the improvement of learning and memory impairment of rat model of Alzheimer disease induced by β-amyloid peptide fragment 25-35(Aβ_(25-35)) and to analysis the possible mechanism. METHODS SD rats were randomly divided into 5groups: blank control group,model group,sham-operated group,low dose drug group(gingerol emulsion,10 mg·kg^(-1)·d^(-1)),high dose drug group(gingerol emulsion,50 mg·kg^(-1)·d^(-1)). Model group and two drug groups were injected Aβ_(25-35)(5 μL) in lateral cerebral ventricle. Sham-operated group were injected the same amount of sterile PBS solution. For blank control group without any treatment. When all the rats refresh themselves and had post-operated activities,two drug groups were gavaged with different concentration of gingerol emulsion,Meanwhile,sham-operated group were gavaged with sterile physiological saline,the remaining two groups without any treatment. After three weeks,we make use of Y labyrinth to test the ability of space learning and memory of rats. Finally,rats were sacrificed to collect blood by abdominal aortic method. The content of acetylcholine(ACh),SOD and MDA were detected in serum. RESULTS(1) Compared with blank control group,the ability of learning and memory of model group rats were weakened,the error times increased in Y labyrinth experiment. In addition,the content of ACh and the activity of SOD significantly decreased,the content of MDA increased(P<0.05).(2) On the contrary,the rats gavaged with gingerol emusion have less error times in Y labyrinth experiment compared with model group. the content of Ach and the activity of SOD significantly increased,the content of MDA decreased(P<0.05). However,two different gingerol emusion concentration groups have no significantly difference. CONCLUSION The ability of learning and memory of rats gavaged with gingerol emusion were significantly improved compared with Aβ_(25-35) induced rats without any treatment.Its mechanism may be related to antioxidant and neurotransmitter.