Alzheimer's disease (AD) is a progressive neurodegenerative disorder that shows cognitive deficits and memory impairment. Extract from the leaves of Gotu Kola (Centella Asiatica) have been used as an alternative medicine for memory improvement in Indian Ayurvedic system of medicine for a long time. Although several studies have revealed its effect in ameliorating the cognitive impairment in rat models of AD and stimulating property on neuronal dendrites of hippocampal region, the molecular mechanism of Gotu Kola on neuroprotection still remains to be elucidated. In this study, we report that phosphorylation of cyclic AMP response element binding protein (CREB) is enhanced in both a neuroblastoma cell line expressing amyloid beta 1-42 (Abeta) and in rat embryonic cortical primary cell culture. In addition, the contribution of two major single components to the enhanced CREB phosphorylatioin was examined. Furthermore, inhibitors were applied in this study revealing that ERK/RSK signaling pathway might mediate this effect of Gotu Kola extract. Taken together, we provide a possible molecular mechanism for memory enhancing property of Gotu Kola extract for the first time.

译文

阿尔茨海默病 (AD) 是一种进行性神经退行性疾病,表现为认知缺陷和记忆障碍。长期以来,从Gotu Kola (积雪草) 的叶子中提取的提取物已被用作印度阿育吠陀医学系统中改善记忆的替代药物。尽管有几项研究表明其在改善AD大鼠模型的认知障碍以及对海马区神经元树突的刺激作用,但Gotu Kola对神经保护的分子机制仍有待阐明。在这项研究中,我们报告了在表达淀粉样蛋白beta 1-42 (Abeta) 的神经母细胞瘤细胞系和大鼠胚胎皮质原代细胞培养物中,环状AMP反应元件结合蛋白 (CREB) 的磷酸化均增强。此外,还检查了两个主要单一成分对增强的CREB磷酸化蛋白的贡献。此外,本研究还应用了抑制剂,表明ERK/RSK信号通路可能介导了Gotu Kola提取物的这种作用。合在一起,我们首次提供了一种可能的分子机制来增强Gotu Kola提取物的记忆。

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