Caged Garcinia Xanthones, a Novel Chemical Scaffold with Potent Antimalarial Activity
作者:Hangjun Ke、Joanne M. Morrisey、Shiwei Qu、Oraphin Chantarasriwong、Michael W. Mather、Emmanuel A. Theodorakis、Akhil B. Vaidya
DOI:10.1128/aac.01220-16
日期:2017.1
falciparum, the causative parasite of human malaria, at the intraerythrocytic stages. Their activity can be substantially improved by attaching a triphenylphosphonium group at the A ring of the caged xanthone. Specifically, CR135 and CR142 were found to be highly effective antimalarial inhibitors, with 50% effective concentrations as low as ∼10 nM. CGXs affect malaria parasites at multiple intraerythrocytic
笼状藤黄原体(CGXs)构成了由藤黄属热带/亚热带树木生产的天然产物家族,具有独特的化学结构,其定义为在an吨酮部分的C环上存在笼状支架,并表现出广泛的生物活动。在这里,我们显示合成的CGXs在红细胞内阶段对人疟疾的致病性寄生虫-恶性疟原虫表现出抗疟疾活性。通过在笼状黄酮的A环上连接一个三苯基phosph基团,可以大大提高它们的活性。具体而言,发现CR135和CR142是高效的抗疟疾抑制剂,有效浓度为50%,低至约10 nM。CGXs在多个红细胞内阶段影响疟原虫,成熟的阶段(滋养体和裂殖体)比不成熟的环更易受伤害。在CGX治疗后数小时内,疟原虫显示出明显的形态变化,寄生虫病(感染的红细胞百分比)显着降低以及线粒体异常分裂。但是,CGX并不靶向线粒体电子传输链,也不是靶向药物atovaquone的靶标和一些临床前候选药物。CGX在低微摩尔水平下对人HEK293细胞具有细胞毒性,这导致前导化合