Abstract
Interferon or azidothymidine inhibition of Friend virus (FV-SFFV) release in Friend erythroleukemic cells results in a 10–20-fold increase in intracisternal A-type particle number within 3–4 days of treatment. Inhibition of Friend or Moloney helper virus by interferon in fibroblast producer cells does not result in a similar increase in intracisternal A-type particles. Friend cells with marginal FV production but with high levels of A-type particles do not change their A-type particle levels upon exposure to interferon. These data suggest that A-type particle expression in Friend cells may be linked to the presence of the transforming SFFV. No marked increase of viral RNA levels during inhibition of virus release is observed in Friend cells.
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