Infection of human foreskin fibroblast(HFF) cells with human cytomegalovirus(HCMV)
induces the secretion of soluble factors including interferon(IFN)-β that stimulates
human leukocyte antigen (HLA)class I expression. In this study, the mechanism of IFN-β
induction by HCMV was investigated. In HCMV-infected HFF cells, IFN-β secretion
increased at 6h post infection(h.p.i). Reverse transcription polymerase chain reaction
(RT-PCR)analysis using ultra violet (UV)-inactivated HCMV indicated that viral gene
expression is not necessary for the stimulation of IFN-β. Stimulation of IFN-β by HCMV
infection was not blocked by cycloheximide, an inhibitor of protein synthesis, further
suggesting that the expression of HCMV genes is not required for the stimulation of IFN-
β gene transcription. IFN-β may be produced from virus-infected cells as an
inflammatory response and nuclear factor kappa B (NF-кB) plays a central role in
inflammatory response. HCMV failed to induce the IFN-β expression, when the virus-
infected cells were treated with pyrrolidine dithiocarbamate(PDTC), an inhibitor of NF-
кB, or LY294002 and wortmannin, inhibitors of phosphatidylinositol 3-kinase(PI3-K).
The result suggests that PI3-K and/or NF-кB may be related with the induction pathway
of IFN-β by HCMV.