The synthesis of novel polyamine–nitroimidazole conjugates designed to probe the structural specificities of the polyamine uptake system in A549 lung carcinoma cells
作者:Adam Q. Siddiqui、Louise Merson-Davies、Paul M. Cullis
DOI:10.1039/a903293b
日期:——
Synthetic routes were developed to synthesise an N
4-mono-derivatised spermidineânitroimidazole conjugate and two novel structural isomers (N
1- and N
8-spermidineânitroimidazole conjugates). A synthetic method was developed to synthesise an N
1,N
7-bis-derivatised norspermidineânitroimidazole conjugate and further applied to the synthesis of an N
1,N
8-bis-derivatised spermidineânitroimidazole conjugate. The compounds were examined for their ability to serve as substrates for the polyamine uptake system in A549 lung carcinoma cells, by measuring their inhibition of [14C]spermidine uptake. Marked differences were observed between the nitroimidazoleâpolyamine conjugates. For maximum recognition as a substrate by the polyamine transport system, the aminobutyl unit of spermidine should remain underivatised. The preferred site(s) for spermidine amino derivatisation was in the order: N
1Â >Â N
8 â N
1, N
8Â >Â N
4.
开发了合成路线以合成N4-单衍生化spermidine-硝基咪唑偶联物以及两种新型结构异构体(N1-和N8-spermidine-硝基咪唑偶联物)。开发了一种合成方法以合成N1,N7-双衍生化norspermidine-硝基咪唑偶联物,并进一步应用于合成N1,N8-双衍生化spermidine-硝基咪唑偶联物。通过测量它们对[14C]精胺摄取的抑制作用,考察了这些化合物作为A549肺癌细胞中多胺摄取系统底物的能力。观察到硝基咪唑-多胺偶联物之间显著的差异。为了最大限度地被多胺转运系统识别为底物,精胺的氨基丁基单元应保持非衍生化状态。精胺氨基衍生化的优选位点依次为:N1 > N8 ≈ N1,N8 > N4。