Synthetic prodigiosenes and the influence of C-ring substitution on DNA cleavage, transmembrane chloride transport and basicity
作者:Soumya Rastogi、Estelle Marchal、Imam Uddin、Brandon Groves、Julie Colpitts、Sherri A. McFarland、Jeffery T. Davis、Alison Thompson
DOI:10.1039/c3ob40477c
日期:——
Analogues of the tripyrrolic natural product prodigiosin bearing an additional methyl and a carbonyl group at the C-ring were synthesised and evaluated. In vitro anticancer activity screening (NCI) and the study of modes of action (copper-mediated cleavage of double-stranded DNA and transmembrane transport of chloride anions) showed that the presence of the methyl group is not detrimental to activity. Furthermore, although the presence of an ester conjugated to the prodigiosene C-ring seems to decrease both pKa and chloride transport efficiency compared to the natural product, these analogues still exhibit a high rate of chloride transport. All analogues exhibit good in vitro anticancer activity and reduced toxicity compared to the natural product: compare an acute systemic toxicity of 100 mg kg−1 in mice vs. 4 mg kg−1 for prodigiosin, pointing towards a larger therapeutic window than for the natural product.
具有C环上额外甲基和羰基的三吡咯天然产物灵菌红素的类似物被合成并评估。体外抗癌活性筛选(NCI)以及作用机制研究(铜介导的双链DNA断裂和氯离子跨膜转运)表明,甲基的存在并不损害活性。此外,尽管与灵菌红素C环偶联的酯似乎降低了pKa和氯离子转运效率,相比于天然产物,这些类似物仍表现出高效的氯离子转运速率。所有类似物都显示出良好的体外抗癌活性,并且毒性降低,相较于天然产物:在小鼠中急性系统毒性为100 mg kg−1,而灵菌红素为4 mg kg−1,表明其具有比天然产物更大的治疗窗口。