The increasing incidence of multidrug-resistant (MDR) pulmonary infections in the cystic fibrosis (CF) population has prompted the investigation of innovative silver based therapeutics. The functionalization of the naturally occurring xanthine theobromine at the N1 nitrogen atom with an ethanol substituent followed by the methylation of the N9 nitrogen atom gives the N-heterocyclic carbene precursor 1-(2-hydroxyethyl)-3,7,9-trimethylxanthinium iodide. The reaction of this xanthinium salt with silver acetate produces the highly hydrophilic silver carbene complex SCC8. The in vitro antimicrobial efficacy of this newly synthesized complex was evaluated with excellent results on a variety of virulent and MDR pathogens isolated from CF patients. A comparative in vivo study between the known caffeine derived silver carbene SCC1 and SCC8 demonstrated the ability of both complexes to improve the survival rates of mice in a pneumonia model utilizing the clinically isolated infectious strain of Pseudomonas aeruginosa PA M57-15.
囊性纤维化(CF)人群中耐多药(MDR)肺部感染的发病率不断增加,促使人们对创新的
银基疗法进行研究。天然存在的
黄嘌呤可可碱在 N1 氮原子处被
乙醇取代基官能化,随后 N9 氮原子甲基化,得到 N-杂环卡宾前体 1-(2-羟乙基)-3,7,9-三甲基
碘化
黄嘌呤。这种
黄嘌呤盐与
乙酸银反应生成高度亲
水性的卡宾
银络合物 SCC8。这种新合成的复合物的体外抗菌功效经过评估,对从 CF 患者中分离出的多种剧毒和 MDR 病原体具有优异的结果。已知的
咖啡因衍生
银卡宾 SCC1 和 SCC8 之间的比较体内研究表明,两种复合物能够提高使用临床分离的
铜绿假单胞菌 PA M57-15 感染菌株的肺炎模型中小鼠的存活率。