Abstract
Six compounds of the 5(7)-alkylamino-6-nitroazolopyrimidine and 8-alkylazolo[5,1-b]purine series were selected based on the structural analysis of A1 adenosine receptor inhibitors and the role of this biological target in the modulation of intraocular pressure, an important factor in the pathogenesis of glaucoma. These heterocycles were shown to exhibit a weak affinity towards the A1 adenosine receptor on an in vitro model of the adenosine-dependent change of the chronotropic effect on isolated atria of white mice. On the other hand, thiadiazolo[3,2-a]pyrimidines and triazolo[5,1-b]purine displayed an in vivo hypotensive effect in rats. The leading compound, 5-methyl-8-(hydroxyethyl)triazolo[5,1-b]purine) (0.2% solution), caused a 34% reduction of ophthalmotonus in 3 h without an adverse resorptive effect. In addition, using the MTT-test it was shown on the human HepG2 cell line that the heterocycles affecting the intraocular pressure were by one to two orders of magnitude less cytotoxic than the reference doxorubicin.
摘要
根据对 A1
腺苷受体
抑制剂的结构分析,以及该
生物靶点在调节眼压(青光眼发病机制中的一个重要因素)中的作用,筛选出了 6 个 5(7)-烷基
氨基-6-硝基唑并
嘧啶和 8-烷基唑并[5,1-b]
嘌呤系列化合物。在体外模型中,这些
杂环化合物对 A1
腺苷受体的亲和力较弱,而在体外模型中,
腺苷依赖性地改变了白鼠离体心房的趋时效应。另一方面,
噻二唑并[3,2-a]
嘧啶和三唑并[5,1-b]
嘌呤在大鼠体内显示出降压作用。主要化合物 5-甲基-8-(羟乙基)三唑并[5,1-b]
嘌呤(0.2% 溶液)可在 3 小时内使眼球震颤减少 34%,且无不良吸收作用。此外,在人类 HepG2
细胞系上使用 M
TT 测试表明,影响眼内压的
杂环化合物的细胞毒性比参照物
多柔比星低一到两个数量级。