title: Effects of nucleoside analogs on Epstein-Barr virus-induced transformation of human umbilical cord leukocytes and Epstein-Barr virus expression in transformed cells.
abstract: Two methods of assay, measuring (i) stimulation of host cell DNA synthesis by [(3)H]thymidine incorporation and (ii) morphological transformation in microtiter plates, were employed to determine what effect treatment during infection with adenine arabinoside or 5-iodo-5'-amino-2',5'-dideoxyuridine has on Epstein-Barr virus (EBV) (B95-8)-induced transformation of human umbilical cord leukocytes. It was found that adenine arabinoside inhibited EBV-induced transformation in a dose-dependent manner in both assays, beginning at drug concentrations (<2 mug/ml) which had little effect on either spontaneous or phytohemagglutinin-induced host cell DNA synthesis. Adenine arabinoside was more effective in inhibiting morphological transformation than EBV-induced host DNA synthesis. Adenine arabinoside treatment was also effective in reducing both EB viral capsid antigen expression and production of biologically active extracellular transforming virus in EBV-transformed cells. In contrast, 5-iodo-5'-amino-2',5'-dideoxyuridine, which inhibited herpes simplex virus replication, had little effect on EBV-induced transformation as measured by either method of assay. However, 5-iodo-5'-amino-2',5'-dideoxyuridine was found to be effective in inhibiting viral capsid antigen expression and production of extracellular transforming virus in EBV-transformed cells.
mesh_terms: D002472:Cell Transformation, Viral / Q000187:drug effects*; D004247:DNA / Q000096:biosynthesis; D005260:Female; D005312:Fetal Blood; D004854:Herpesvirus 4, Human / Q000187:drug effects*; D006801:Humans; D007065:Idoxuridine / Q000031:analogs & derivatives* / Q000494:pharmacology; D007962:Leukocytes / Q000187:drug effects*; D014740:Vidarabine / Q000494:pharmacology*
chemical_list: C021283:5'-amino-5-iodo-2',5'-dideoxyuridine; D004247:DNA; D014740:Vidarabine; D007065:Idoxuridine