Impaired transcription of the poly rI:rC- and interferon-activatable 202 gene in mice and cell lines from the C57BL/6 strain - PubMed (original) (raw)
Impaired transcription of the poly rI:rC- and interferon-activatable 202 gene in mice and cell lines from the C57BL/6 strain
M Gariglio et al. Virology. 1992 Mar.
Abstract
Activation of 202 and (2'-5')(A)n synthetase genes after injection of interferon (IFN)-inducing, double-stranded, poly rI:rC was compared in various mouse strains. The 202 mRNA level increased 4.5- to 10-fold in DBA/2, BALB/c, and C3H/HeJ mice, whereas in C57BL/6 mice it rose only to about that in untreated DBA/2, BALB/c, and C3H/HeJ mice. To determine whether this low level was due to a reduced transcription rate, a nuclear "run-on" assay was performed with NIH 3T3 cells or BLK cells derived from C57BL/6 mice. IFN-alpha increased the 202 mRNA transcription severalfold in NIH 3T3 cells only, and that of a (2'-5')(A)n synthetase gene in both cell lines. The possibility that an alteration in transacting factors could be responsible for this difference was examined. For this purpose the 5' terminal flanking region (called the b segment, about 0.8 kb) of the 202 gene was linked to a heterologous reporter gene--chloramphenicolacetyl-transferase (CAT) and transfected into normal or transformed NIH 3T3 cells and into various C57BL/6-derived cell lines. IFN-alpha induced strong CAT activity in transfected normal or transformed NIH 3T3 cells, but a much lower activity in those from C57BL/6 mice. The b segment contains an IFN-responsive element (ISRE) (35 bp) homologous to that present in several other IFN-inducible genes. Three tandem copies of the 202 ISRE were linked to an enhancerless SV40 early promoter driving an influenza virus hemagglutinin (HA) cDNA segment. No increase in HA mRNA expression was detected in the transfected BLK cell line derived from C57BL/6 mice following IFN treatment, whereas in the NIH 3T3 cell line, the IFN treatment resulted in a 2.5-fold increase. These and other results suggest that C57BL/6 mice and cell lines derived from them might carry defective transacting factors impairing the ability of IFN-alpha to activate the 202 gene without impairing its ability to activate a (2'-5')(A)n synthetase gene.
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