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Activation of the Human Beta-interferon Gene Requires an Interferon-inducible Factor

Overview
Journal Mol Cell Biol
Specialty Cell Biology
Date 1986 Mar 1
PMID 3773893
Citations 101
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Abstract

beta-Interferon (beta-IFN) gene expression can be induced by poly(I)-poly(C) or virus, but there is considerable variation in the extent of induction between different cell lines. We characterized two poorly inducible human cell lines, HeLa and 143 thymidine kinase negative (143 tk-), to define cellular factors involved in the activation of the beta-IFN gene. We show that the deficiency in beta-IFN induction in these cells can be complemented by fusion to highly inducible mouse cells. We conclude that the human cells are deficient in a trans-acting factor required for B-IFN gene activation. The level of induction of the beta-IFN gene in HeLa and 143 tk- cells can also be increased by priming with IFN before induction. If IFN priming is carried out in the presence of cycloheximide, a approximately 200-fold increase in induction is observed. We conclude that activation of the beta-IFN gene requires an IFN-inducible factor that is only expressed at low levels in unprimed HeLa and 143 tk- cells.

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