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JACS:抑制阿尔茨海默症发展分子机制被发现!

2017-10-13 心湖,Juka 转化医学网

众所周知,饮用绿茶对大脑具有很大的益处。绿茶提取物的抗氧化和解毒特性有助于抵抗阿尔茨海默病等重大疾病。然而,科学家至今没有完全了解绿茶发挥作用的分子机制,以及如何利用它们来寻找更好的治疗方法。


众所周知,饮用绿茶对大脑具有很大的益处。绿茶提取物的抗氧化和解毒特性有助于抵抗阿尔茨海默病等重大疾病。然而,科学家至今没有完全了解绿茶发挥作用的分子机制,以及如何利用它们来寻找更好的治疗方法。

一项来自麦克马斯特大学的研究揭示了这些基础机制的新亮点。临床证据表明,绿茶中丰富的活性成分EGCG(表没食子儿茶素-3-没食子酸酯)干扰了有毒物质(oligomers)的形成,而该机制正是导致阿尔茨海默症患者早期阶段意识衰退的主要原因之一。

从事阿尔茨海默症研究近15年的Giuseppe Melacini教授解释说:“在分子水平上,我们认为EGCG会涂覆有毒的低聚物,并改变其增长以及作用于健康细胞的能力。”

研究人员说,这一刊登在美国化学学会杂志的封面上的发现,是十年来核磁共振(NMR)方法不断取得进步的结果,并且将会产生新的疗法和进一步的药物发现。

尽管有数十年的研究,阿尔茨海默病的致病原因尚未完全了解,治疗方案更是有限。根据最新的人口普查数据,居住在加拿大的老年人现在超过儿童,大大增加了对有效药物和预防方式的需求。据估计,到2031年,加拿大痴呆症患者将达到93.7万人,比目前的人数增加66%。

“我们都知道,目前阿尔茨海默病病症一旦出现,就无法治愈,所以寄希望于早期干预,这可能意味着早期使用绿茶提取物或其衍生物,例如在症状出现之前的15至25年。”Melacini教授说。

接下来,研究人员希望解决诸如如何修饰EGCG及类似物等必要问题,从而可以有效地用作食品添加剂。 EGCG在室温下不稳定且难以输送到人体,尤其是大脑等这些问题都有待解决。

Melacini说:“食品添加剂可能是一种关键的疗法或佐剂,除了运动和健康的生活方式之外,在生命的早期阶段利用食品添加剂促进健康老龄化将是十分重要的一种方式。”

原始出处:

Rashik Ahmed et al. Molecular Mechanism for the (-)-Epigallocatechin Gallate-Induced Toxic to Nontoxic Remodeling of Aβ Oligomers, Journal of the American Chemical Society (2017). DOI: 10.1021/jacs.7b05012 

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    2017-10-15 yaanren
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    2017-10-13 1e0f8808m18(暂无匿称)

    好文章.学习了.

    0

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在中国,喝茶是一种拥有悠久历史的文明活动。而在近几十年来,新时代的健康大师和茶爱好者已经阐述了喝茶以及茶相关制品的好处,并且有相当一部分的研究表明饮茶可以减肥。但是相对而言的,人们感觉绿茶相对而言比红茶更加有利于健康(当然不仅仅是因为绿茶是绿色的)

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近期,一项发表在杂志Sci Rep上的研究评估了O. Fragrans花(桂花)与绿茶的抗氧化协同作用,并确定了其主要抗氧化剂的合成总量。通过LC-MS的方法鉴定了含有绿茶的O. fragrans花中的抗氧化剂化合物,并通过UPLC-PDA定量。在模拟人体消化后,使用Prieto's模型测试了O. fragrans花与绿茶及其抗氧化剂之间的协同抗氧化剂相互作用。研究结果显示:O. fragrans

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不断的有证据表明肥胖在前列腺致癌和预后中具有作用,因此,鉴定和继续评估有效的干预措施从而减少高风险人群肥胖十分必要。最近,有研究人员调查了日常去咖啡因绿茶儿茶酚(GTC)(多酚E®(PolyE))的消费对具有高风险前列腺癌男性肥胖生物标记的影响。研究人员设计了一个随机的、双盲的试验,包括了97名被诊断为HGPIN或者ASAP的男性。参试者随机的接受为期1年的GTC(PolyE)(n=49)或者安慰

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