Semisynthesis and Structure–Activity Studies of Uncarinic Acid C Isolated from <i>Uncaria rhynchophylla</i> as a Specific Inhibitor of the Nucleation Phase in Amyloid β42 Aggregation
作者:Takuya Yoshioka、Kazuma Murakami、Kyohei Ido、Mizuho Hanaki、Kanoko Yamaguchi、Satohiro Midorikawa、Shinji Taniwaki、Hiroki Gunji、Kazuhiro Irie
DOI:10.1021/acs.jnatprod.6b00392
日期:2016.10.28
3 acted as a specific inhibitor of the nucleation phase of Aβ42 aggregation. Compound 3 was synthesized from saponin A (10), an abundant byproduct of rutin purified from Uncaria elliptica. Comprehensive structure–activity studies on 3 suggest that both a C-27 ferulate and a C-28 carboxylic acid group are required for its inhibitory activity. These findings may aid the development of oligomer-specific
42聚体淀粉样β蛋白(Aβ42)的寡聚体而不是原纤维在阿尔茨海默氏病(AD)的病理学中引起突触功能障碍。Aβ42的成核依赖性聚集模型中的成核阶段与低聚物的形成有关。钩藤钩藤(Uncaria rhynchophylla)是一种被广泛用于治疗AD症状的汉方药物“ Yokukansan”的成分之一。以前,发现毛状支原体的提取物可减少Aβ42的聚集,但尚未确定其有效成分。在目前的工作中,非carcaricic酸C(3)被确定为U. rhynchophylla中存在的Aβ42聚集的抑制剂。此外,化合物3充当Aβ42聚集成核相的特异性抑制剂。化合物3是由皂苷A(10)合成的,皂苷A是从椭圆钩藤(Uncaria elliptica)纯化的芦丁的丰富副产品。对3进行的全面结构活性研究表明,C-27阿魏酸酯和C-28羧酸基团均具有抑制活性。这些发现可能有助于开发用于AD治疗的低聚物特异性抑制剂。