A convenient trifluoromethylation method was firstly applied to the synthesis of 8- CF3-purine nucleosides. On the basis of this method, new protection and deprotection strategies were developed for the successful synthesis of the trifluoromethylated cyclic-ADP-ribose mimic, 8-CF3-cIDPRE 1. Using intact, fura-2-loaded Jurkat T cells compound 1 and 2â²,3â²-O-isopropylidene 8-CF3-cIDPRE 14 were characterized as membrane-permeant cADPR agonists. Contrary to the 8-substituted cADPR analogues that mainly act as antagonists of cADPR in cells, 8-substituted cIDPRE derivatives were shown to be Ca2+ mobilizing agonists. Here we report that even compound 1, the 8-substituted cIDPRE with the strong electron withdrawing CF3 group, behaves as an agonist in T cells. Interestingly, also the partially protected 2â²,3â²-O-isopropylidene 8-CF3-cIDPRE activated Ca2+ signaling indicating only a minor role for the hydroxyl groups of the southern ribose of cADPR for its biological activity. To our knowledge 8-CF3-cIDPRE 1 is the first reported fluoro substituted cADPR mimic and 8-CF3-cIDPRE 1 and compound 14 are promising molecular probes for elucidating the mode of action of cADPR.
首先应用了一种便捷的三
氟甲基化方法合成8-三
氟甲基
嘌呤核苷。在此基础上,研发了新颖的保护和去保护策略,顺利合成了三
氟甲基化
环状ADP核糖模拟物,即8-CF\(}_3}\)-cIDPRE 1。利用完整、装载了fura-2的Jurkat T细胞,化合物1和2′,3′-O-异亚丙基-8-CF\(}_3}\)-cIDPRE 14被鉴定为膜渗透性c
ADPR激动剂。与主要作为细胞内c
ADPR拮抗剂的8-取代c
ADPR类似物相反,8-取代cIDPRE衍
生物显示为
钙动员激动剂。本文报道,即使化合物1,即含有强吸电子CF\(}_3}\)基团的8-取代cIDPRE,在T细胞中亦表现激动剂性质。有趣的是,部分保护的2′,3′-O-异亚丙基-8-CF\(}_3}\)-cIDPRE也激活了
钙信号,表明c
ADPR南侧
核糖上的羟基对其
生物活性仅有微小作用。据我们所知,8-CF\(}_3}\)-cIDPRE 1是首个报道的含
氟c
ADPR模拟物,而8-CF\(}_3}\)-cIDPRE 1及化合物14则是阐明c
ADPR作用机制的有前景的分子探针。