Induction and regulation of the 26-kDa protein in the absence of synthesis of beta-interferon mRNA in human cells - PubMed (original) (raw)

Induction and regulation of the 26-kDa protein in the absence of synthesis of beta-interferon mRNA in human cells

P Poupart et al. Eur J Biochem. 1984.

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Abstract

The expression of the gene coding for the 26-kDa protein coinduced with human beta-interferon (HuIFN-beta) in human fibroblasts has been measured by cytoplasmic dot hybridization in WISH cells. The production of the 26-kDa-protein mRNA is not induced by poly(I).poly(C) but maximally induced by cycloheximide alone. In contrast, HuIFN-beta is induced by poly(I).poly(C) and not by cycloheximide. WISH cells showed in addition a low constitutive level of 26-kDa-protein mRNA prior to induction. These results were confirmed by sizing the RNAs by Northern blot analysis. Pretreatment with partially purified or pure IFN-beta has only a slight effect on 26-kDa protein mRNA production. We have also determined the kinetics of induction and the amount of inducer required for an optimal induction of the 26-kDa-protein mRNA in WISH cells. This mRNA was thus maximally induced in WISH cells in the absence of detectable IFN-beta; it represents about 0.05% of poly(A)-rich mRNA in cycloheximide-induced WISH cells. We had already found that the 26-kDa-protein does not share the general characteristics of interferons. These results suggest that HuIFN-beta and the 26-kDa-protein genes are differently regulated.

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