1887

Abstract

Summary

We have examined the relationship between induction of interferon (IFN) and prostaglandin E (PGE) production by poly(rI).poly(rC) in cultured human foreskin fibroblasts (FS11). Hydrocortisone and dexamethasone (2.5 × 10 ), which are known inhibitors of PGE synthesis, significantly decreased the induction of both IFN and PGE in IFN-pretreated (primed) cells. Desoxycorticosterone, progesterone and estradiol were devoid of this activity. Hydrocortisone also blocked the induction of IFN by double-stranded RNA (dsRNA), cycloheximide and actinomycin D in FS11 cells. Arachidonic acid overcame the inhibitory effect of hydrocortisone on PGE production, but failed to restore IFN production in the presence of the steroid. Moreover, the prostaglandin synthetase inhibitors, indomethacin, aspirin and flufenamic acid, did not change IFN production by dsRNA in primed FS11 cells, although prostaglandin synthesis was abolished. Although the induction of IFN and PGE by poly(rI).poly(rC) might be consequences of the same initial event in the cell, the accumulation of PGE does not seem to have a regulatory effect on the synthesis of IFN in this system.

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1982-12-01
2021-10-28
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