ABSTRACT
The antileishmanial efficacy of four novel quinoline derivatives was determined in vitro against
Leishmania chagasi
, using extracellular and intracellular parasite models. When tested against
L. chagasi
-infected macrophages, compound 3b demonstrated 8.3-fold greater activity than did the standard pentavalent antimony. No significant activity was found for compounds 3a, 4a, and 4b. The antilesihmanial effect of compound 3b was independent of host cell activation, as demonstrated by nitric oxide production. Ultrastructural studies of promastigotes treated with compound 3b showed mainly enlarged mitochondria, with matrix swelling and reduction in the number of cristae. Synthetic analogues based on the quinoline ring structure, already an established template for antiparasitic drugs, could provide further useful compounds.
摘要
在体外测定了四种新型喹啉衍生物对利什曼原虫的抗利什曼病药效
Leishmania chagasi
细胞外和细胞内寄生虫模型。在对
感染巨噬细胞时
-感染的巨噬细胞时,化合物 3b 的活性是标准五价锑的 8.3 倍。化合物 3a、4a 和 4b 没有发现明显的活性。化合物 3b 的抗放线菌作用与宿主细胞活化无关,一氧化氮的产生证明了这一点。用化合物 3b 处理原核细胞的超微结构研究显示,线粒体主要增大,基质膨胀,嵴数量减少。喹啉环结构已经成为抗寄生虫药物的模板,基于喹啉环结构的合成类似物可以提供更多有用的化合物。