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The nucleoside analog 2'-nor-2'-deoxyguanosine (2'NDG) effectively inhibits the replication of several laboratory and clinical isolates of human cytomegalovirus. These isolates included viruses obtained from congenitally infected infants and patients suffering from acquired immune deficiency syndrome. The dose of 2'NDG that inhibited cytomegalovirus plaque formation ranged from 0.1 to 1.6 micrograms/ml. At 10 micrograms/ml, 2'NDG completely blocked the production of virus progeny but not the expression of immediate early and early virus gene functions. Cytomegalovirus DNA was not detectable in 2'NDG-treated virus-infected human embryo lung cells when assayed by CsCl density gradient centrifugation. In contrast, the guanosine analog acyclovir at 100 micrograms/ml did not inhibit the production of virus or the synthesis of cytomegalovirus DNA. In virus-infected cells, 2'NDG and acyclovir at 10 and 100 micrograms/ml, respectively, inhibited the incorporation of [3H]thymidine and 32Pi into cellular DNA by ca. 50%. Uninfected human embryo lung cells grown in these concentrations of acyclovir or 2'NDG exhibited a slightly transient lag phase but, overall, cell growth was not retarded, and there was no decrease in cell viability. The extended lag in cell division was not due to inactivation or breakdown of the antiviral compounds but may be due in part to a temporary decrease in cellular DNA synthesis.

Effects of the nucleoside analog 2'-nor-2'-deoxyguanosine on human cytomegalovirus replication