Biologically Active Oligodeoxyribonucleotides. VII. Anti-HIV-1 Activity of Hexadeoxyribonucleotides Bearing 3′- and 5′-End-Modifications

It has been determined that hexadeoxyribonucleotides (5′TGGGAG3′), which have modified aromatic groups such as the trityl group at the 5′-end, exhibit anti-HIV-1 activity in vitro. The 6-mer (S-1443) bearing a 3,4-dibenzyloxybenzyl (3,4-DBB) group at the 5′-end and a 2-hydroxyethylphosphate group at the 3′end exhibited the most potent activity and the least cytotoxicity. Moreover, it was found that the S-1443 was the most stable, when the 6-mer analogues were incubated with mouse, rat, or human plasma.