Science子刊:Verubecestat-新型抗阿尔茨海默症药物,有望引发治疗新变革

2016-11-07 MedSci MedSci原创

一种靶向于脑中的淀粉样蛋白(阿尔茨海默病的主要标志物之一)的新型药物在一项小规模临床试验中取得了可喜的成果,同时,这一成果正在于两项涉及3500人的大型研究中进行评估。如果这种以片剂形式服用的药物确实被证实能缓解阿尔茨海默氏症带来的严重记忆力衰退,那么这种药物将会是未来十年内进入市场的首个治疗方法。

一种靶向于脑中的淀粉样蛋白(阿尔茨海默病的主要标志物之一)的新型药物在一项小规模临床试验中取得了可喜的成果,同时,这一成果正在两项涉及3500人的大型研究中进行评估。如果这种以片剂形式服用的药物确实被证实能缓解阿尔茨海默氏症带来的严重记忆力衰退,那么这种药物将会是未来十年内进入市场的首个治疗方法。

该新药由制药巨头merck实验室开发,已经完成了涉及32位阿尔茨海默病患者的I期临床试验。 该试验主要集中在评估药物的安全性,但在过程中,似乎可以阻断毒性淀粉样蛋白的产生。


在患有阿尔茨海默病的患者大脑中,淀粉样蛋白积聚并聚集,与神经细胞间形成致密的毒性细胞外老年斑。同时,神经细胞内神经原纤维缠结在一起是该机并的另外一个关键指标,它可以破坏脑周围必需营养物的运输,从而导致相关的认知衰退和记忆丧失。虽然科学家多年来一直在辩论,究竟是淀粉样斑块还是神经原纤维缠结在驱动阿尔茨海默病的发病中起到了更关键性的作用,但能消除其中的一种对于其中的一种就可以减缓疾病的进展,或至少缩小了疾病引发主因范围。

如果这一新药(称为Verubecestat)的临床结果可以在更大,更长期的III期临床试验中复制,科学家就可以找到一种有效地方法来阻止这些斑块的形成。

目前,阿尔茨海默症患者的治疗选择非常有限,市场上的药品仅提供认知和功能症状的短期改善,但不直接针对基础疾病过程。如果这一产品能够上市,将为患者提供巨大的治疗福音。

该1期临床试验入组32名早期阿尔茨海默病患者,每天服用该药物,连续7天。 选取健康志愿者服用药物两周作为对照。在试验过程中,未发现该药物有任何不良反应,证明药物安全性良好,同时,发现了一些令人可喜的结果。由于实验进行时间较短,因此并未观察到脑扫描中淀粉样蛋白斑块的积累变化过程,但是脑周液体样品显示形成的异常淀粉样蛋白的化合物已经减少。

BACE1通过将淀粉样蛋白前体蛋白(APP)的分子切成片段而促进淀粉样蛋白的产生,而Verubecestat作为一种BACE1蛋白酶抑制剂,通过抑制该酶的活性而阻断淀粉样蛋白的合成。虽然BACE1抑制剂过去也有过研发,但是Verubecestat在治疗过程中并未发现副作用,这是淀粉样蛋白靶向治疗的一个里程碑式的进步。

目前,merck的研发团队已经开始该药物的两项三期临床试验,一项入组2000名轻度至中度阿尔茨海默症患者,另一项入组1500名前驱性阿尔茨海默症患者。 每项试验将运行至少18个月。前者有望在2017年7月得到试验结果,后者预计要到2019年。

目前,一期和动物试验结果已经发表在Science Translational Medicine上。

原始出处:

Kennedy M, Stamford A, Chen X, Cox K, Cumming J, Dockendorf M, et al. The BACE1 inhibitor verubecestat (MK-8931) reduces CNS β-amyloid in animal models and in Alzheimer's disease patients. Sci Transl Med 2016;8:363ra150.

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    2016-11-12 ylzr123

    如果这种以片剂形式服用的药物确实被证实能缓解阿尔茨海默氏症带来的严重记忆力衰退,那么这种药物将会是未来十年内进入市场的首个治疗方法。

    0

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    2016-11-09 jichang
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