葡萄籽原花青素对血管性痴呆大鼠空间学习记忆能力的影响
Effects of grape seed procyanidins on spatial learning and memory in vascular dementia model of rats
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摘要: 目的 观察葡萄籽原花青素(GSP)对血管性痴呆(VD)大鼠空间学习记忆能力的影响,探讨其可能的作用机制。 方法 采用改良Pulsinelli四血管阻塞法建立VD大鼠模型,造模成功后,每天灌胃给药,Wistar大鼠分为假手术组,模型组,原花青素组(50 mg/kg和150 mg/kg),银杏叶片24 mg/kg。Morris水迷宫检测VD大鼠空间学习记忆能力;比色法检测脑组织超氧化物歧化酶(SOD)活性、总抗氧化能力(T-AOC)、谷胱甘肽(GSH)、丙二醛(MDA)含量;实时荧光定量PCR(Real-time PCR)法检测海马Bax、Bcl-2 mRNA的表达。 结果 与模型组比较,原花青素可明显改善VD大鼠空间学习记忆能力;提高脑组织SOD活性、GSH含量和总抗氧化能力,降低MDA含量;提高海马Bcl-2/Bax mRNA比值。 结论 原花青素可改善VD大鼠学习记忆功能,其机制可能与提高机体抗氧化能力、抑制海马神经元凋亡有关。Abstract: Objective To investigate the effects and possible mechanisms of procyanidins, a polyphenol extracted from grape seeds, on spatial learning and memory in rats model of vascular dementia(VD). Methods Modified Pulsinelli's 4-vessel occlusion (4-VO) method was used for replicating vascular dementia in rats. The male Wistar rats were divided equally into 5 experimental groups: in one the rats were subjected to sham-operated, and in the other four the rats was subjected to the 4-VO surgery followed by oral administration of vehicle, Ginkgo leaf extract(24 mg/kg), procyanidins(50 or 150 mg/kg) respectively. The spatial learning and memory performance was recorded as the acquisition trial and probe trial in the Morris water maze. The levels of malondialdehyde(MDA), glutathione(GSH), total antioxidant capacity(T-AOC) and the activity of superoxidedismutase(SOD) in the brain tissue were determined by colorimetric Assay Kit. The gene expression of Bax and Bcl-2 in the rat hippocampus was detected by real-time PCR. Results The vascular dementia rats treated with procyanidins showed decreased escaped latency during acquisition training, especially at the dose of 150 mg/kg, procyanidins also increased exploration time and frequency of crossing in the target quadrant during probe trial. The administration of procyanidins induced increase in GSH, T-AOC contents and SOD activities with lowering MDA levels in the brain. In addition, procyanidins upregulated the Bcl-2/Bax ratio of mRNA expression in the rat hippocampus. Conclusion Procyanidins could have potentials for improving the spatial cognition with VD,which was possibly due to the antioxidative and anti-apoptotic effects of polyphenol.
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Key words:
- procyanidins /
- vascular dementia /
- oxidative stress /
- apoptosis
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