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The effect of acyclovir [9-(2-hydroxyethoxymethyl)guanine] on Epstein-Barr virus (EBV) DNA replication in the lymphoblastoid cell lines P3HR-1 and Raji is reported. Acyclovir at a concentration of 100 microM completely inhibited EBV DNA synthesis in superinfected Raji cells, but did not inhibit DNA synthesis in mock-infected cells. The number of EBV genome equivalents per cell in the virus-producing cell line P3HR-1 was significantly reduced by acyclovir, whereas the number of latent EBV genomes in Raji cells was not affected by the drug. In situ cytohybridization performed on untreated P3HR-1 cultures revealed the presence of relatively large amounts of EBV DNA in 15 to 20% of the cells. After a 100 microM drug treatment, no P3HR-1 cells contained levels of EBV DNA detectable by in situ cytohybridization. Indirect immunofluorescence studies demonstrated that during treatment with 100 microM acyclovir for 7 days, the percentage of P3HR-1 cells expressing viral capsid antigen was reduced. The EBV DNA remaining in P3HR-1 cells after treatment with 100 microM acyclovir (approximately 14 genomes per cell) had the properties of covalently closed circular DNA with an average molecular weight of 108 X 10(6), as determined by contour length measurements.

Effect of acyclovir [9-(2-hydroxyethoxymethyl)guanine] on Epstein-Barr virus DNA replication