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Interferon-induced Proteins in Human Fibroblasts and Development of the Antiviral State

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Journal J Virol
Date 1980 May 1
PMID 6154807
Citations 12
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Abstract

Treatment of human fibroblasts with interferon induces the synthesis of several proteins, as detected by incorporation of [35S]methionine followed by analysis of cell extracts by polyacrylamide gel electrophoresis. The induction of these proteins had features in common with the development of the antiviral effect of interferon, such as (i) sensitivity to actinomycin D and cycloheximide when these compounds were added together with interferon, (ii) insensitivity to actinomycin D if the actinomycin D was added 2 h after the addition of interferon, (iii) similar dependence on interferon concentration, and (iv) species specificity for interferon. When interferon treatment was given in the presence of cycloheximide and actinomycin D was added before the removal of cycloheximide, all four proteins were induced, thus suggesting that their inductions are coordinated. Labeling for 2-h periods at varying time intervals after the addition of interferon revealed that the synthesis of these proteins was induced within a few hours, peaked at different time intervals, and was soon followed by a marked decline, suggesting that the mRNA's for these proteins have short half-lives. Moreover, this decline occurred despite the fact that the cells were continuously exposed to interferon, and there was no measurable loss of interferon activity in the medium. This suggests that the induction of these proteins is transient and is apparently subject to further control.

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