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Journal of Virology, August 2007, p. 8656-8665, Vol. 81, No. 16
0022-538X/07/$08.00+0     doi:10.1128/JVI.00322-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Tissue-Specific and Inducer-Specific Differential Induction of ISG56 and ISG54 in Mice{triangledown}

Fulvia Terenzi,1 Christine White,1 Srabani Pal,1 Bryan R. G. Williams,2 and Ganes C. Sen1*

Department of Molecular Genetics, The Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio,1 Monash Institute of Medical Research, Clayton, Australia2

Received 13 February 2007/ Accepted 25 May 2007

The interferon-stimulated genes (ISGs) ISG56 and ISG54 are strongly induced in cultured cells by type I interferons (IFNs), viruses, and double-stranded RNA (dsRNA), which activate their transcription by various signaling pathways. Here we studied the stimulus-dependent induction of both genes in vivo. dsRNA, which is generated during virus infection, induced the expression of both genes in all organs examined. Induction was not seen in STAT1-deficient mice, indicating that dsRNA-induced gene expression requires endogenous IFN. We further examined the regulation of these ISGs in several organs from mice injected with dsRNA or IFN-ß. Both ISG56 and ISG54 were widely expressed and at comparable levels. However, in organs isolated from mice injected with IFN-{alpha} the expression of ISG54 was reduced and more restricted in distribution compared with the expression level and distribution of ISG56. When we began to study specific cell types, splenic B cells showed ISG54 but not ISG56 expression in response to all agonists. Finally, in livers isolated from mice infected with vesicular stomatitis virus, the expression of ISG56, but not ISG54, was induced; this difference was observed at both protein and mRNA levels. These studies have revealed unexpected complexity in IFN-stimulated gene induction in vivo. For the first time we showed that the two closely related genes are expressed in a tissue-specific and inducer-specific manner. Furthermore, our findings provide the first evidence of a differential pattern of expression of ISG54 and ISG56 genes by IFN-{alpha} and IFN-ß.

* Corresponding author. Mailing address: Department of Molecular Genetics/NE20, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195. Phone: (216) 444-0636. Fax: (216) 444-0513. E-mail: seng{at}ccf.org

{triangledown} Published ahead of print on 6 June 2007.

Journal of Virology, August 2007, p. 8656-8665, Vol. 81, No. 16
0022-538X/07/$08.00+0     doi:10.1128/JVI.00322-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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