The expression in human fibroblasts of the p2-interferon (IFN-.82) gene, which is now recognized to be identical to the gene encoding B-cell differentiation factor BSF-2, is enhanced by several cytokines that affect cell growth (tumor necrosis factor, interleukin 1, platelet-derived growth factor, and fi1-interferon). We have examined the possibility that IFN-.82 gene expression is regulated through activation, by diacylglycerol, of the protein kinase C pathway.
MATERIALS AND METHODSThe human foreskin diploid fibroblast strain FS-4 was obtained from J. Vildek (New York University School of Medicine, New York); procedures for its growth in cell culture and for the IFN-p2 mRNA induction experiments have been described (1,5,12,13). In brief, FS-4 cells were grown to confluence in T-175 Falcon flasks in Eagle's minimal essential medium supplemented with 10% (vol/vol) heat-inactivated fetal bovine serum (GIBCO). The cultures were refed at weekly intervals, and confluent cultures were used for experiments 6-8 days after the last medium change. Concentrated solutions of the experimental reagents were added directly to the spent medium in the cultures. 1,2-Dioctanoylglycerol (diC8) was purchased from Avanti Polar Abbreviations: diC8, 1,2-dioctanoylglycerol; H7, 1-(5-isoquinolinesulfonyl)-2-methylpiperazine dihydrochloride; H8, N-[2-(methylamino)ethyl]-5-isoquinolinesulfonamide dihydrochloride; IFN, interferon; IL-1, interleukin 1; OAG, 1-oleoyl-2-acetylglycerol; TNF, tumor necrosis factor; VSV, vesicular stomatitis virus.
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