Macrocyclic hexaoxazoles: Influence of aminoalkyl substituents on RNA and DNA G-quadruplex stabilization and cytotoxicity
作者:Mavurapu Satyanarayana、Young-Ah Kim、Suzanne G. Rzuczek、Daniel S. Pilch、Angela A. Liu、Leroy F. Liu、Joseph E. Rice、Edmond J. LaVoie
DOI:10.1016/j.bmcl.2010.03.086
日期:2010.5
A series of 24-membered macrocyclichexaoxazoles containing one or two aminoalkyl substituents was synthesized and evaluated for cytotoxicity and for their ability to selectively stabilize G-quadruplex DNA and RNA. The most cytotoxic analog 4a, with IC50 values of 25 and 130 nM using KB3-1 and RPMI 8402 cells, is efficacious in vivo in athymic nude mice with a human tumor xenograft from the breast
The penta- and tetraoxazole telomestatin analogs L2H2-5OTD (4) and L2H2-4OTD (5) were synthesized as new G-quadruplex ligands in order to evaluate the influence of the size of the planar macrocycle on the G-quadruplex-stabilizing efficacy. These ligands were less potent stabilizers of various G-quadruplex-forming oligonucleotides than L2H2-6OTD (2a), which has a hexaoxazole-type macrocycle.