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Sci Rep:世界阿尔茨海默病日:口服药物,或破阿尔茨海默症治疗僵局

2019-09-21 顾露露 生物探索

阿尔茨海默症(Alzheimer‘s disease)导致神经细胞死亡,随着时间推移,大脑急剧萎缩,细胞破坏导致记忆力衰退、性格改变以及日常活动的问题。

阿尔茨海默症(Alzheimer‘s disease)导致神经细胞死亡,随着时间推移,大脑急剧萎缩,细胞破坏导致记忆力衰退、性格改变以及日常活动的问题。

科学家发现,β-淀粉样蛋白的异常沉积是最有可能导致阿尔茨海默症的原因。虽然蛋白质通常负责重要的细胞过程,但当人患有阿尔茨海默症时,这些蛋白质变成“流氓”,形成团块并杀死健康的神经细胞。

2017年,加拿大阿尔伯塔大学神经学家Jack Jhamandas教授发现了一种名为“AC253”的化合物可以中和β-淀粉样蛋白的毒性,改善患阿尔茨海默症小鼠的认知缺陷,并提出胰淀素受体是治疗阿尔茨海默症的靶点。

时隔2年,Jack Jhamandas教授又揭开了一个与阿尔茨海默症有关的新谜题,使我们离治愈这种疾病又近了一步。

发表于《Scientific Reports》杂志上的新研究中,Jhamandas和他的团队发现通过连续五周每天给阿尔茨海默症小鼠注射两种短肽,可以显著改善小鼠的记忆力。这种方法还减少大脑因阿尔茨海默症引起的有害物理变化。

“在接受药物的小鼠中,我们发现淀粉样蛋白斑块积聚较少,脑部炎症减少。” Jhamandas说道,“这非常有趣且令人兴奋,因为它向我们表明,新方法不仅让小鼠的记忆力得到改善,而且阿尔茨海默症的脑病理学迹象也得到了极大的改善。这对我们来说有点意外。”

先前研究为基础

虽然AC253可以防止β-淀粉样蛋白的积聚,但它并不能有效地到达大脑,并且在血液中很快被代谢。因此,使用AC253的治疗需要大量化合物才有效(这是不切实际的),并且增加了机体对治疗产生免疫反应的可能。将AC253从可注射药物转化为药丸,或许可以解决代谢问题并提高疗效,但AC253过于复杂,无法制备有效的口服药物。

2017年,Jack Jhamandas和他的团队在测试抑制淀粉样蛋白的方法

Jhamandas的解决方案是将AC253切成短肽,看看它是否可以阻断β-淀粉样蛋白的积聚。Jhamandas的研究小组通过对携带阿尔茨海默症的转基因小鼠进行一系列测试,发现了两个较短的AC253片段,它们同样具有预防和修复功能。

新药正在开发中

随着短肽的发现,Jhamandas和他的团队(包括著名的病毒学家Lorne Tyrell和Michael Houghton),使用计算机建模和人工智能技术来开发一种小分子药物——类似于治疗高血压胆固醇的药物。

Jhamandas解释说,小分子药物更适合治疗,而且对于制药公司而言,它们制造起来更便宜。此外,口服可以更容易通过血液到达大脑。

虽然Jhamandas对他的新药改变阿尔茨海默症治疗方式的潜力持乐观态度,但这是长达15到20年的工作积累。他比喻道:“就像盖房子一样,需要一块一块砖头堆砌起来,最后才有了房子。”

阿尔茨海默症领域的新药开发“僵局”,临床试验阶段的失败率之高让人望而却步。我们由衷地希望,Jhamandas的新药能够早日研发成功,为更多阿尔茨海默症患者带来福音。

原始出处:
Rania Soudy, Ryoichi Kimura, Aarti Patel, et al. Short amylin receptor antagonist peptides improve memory deficits in Alzheimer’s disease mouse model. Scientific Reports. 29 July 2019.

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    2019-12-24 gdsun
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    2019-09-21 坚强007

    向科研人员致敬

    0

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