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Journal of Virology, July 2005, p. 8295-8302, Vol. 79, No. 13
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.13.8295-8302.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Innate STAT1-Dependent Genomic Response of Neurons to the Antiviral Cytokine Alpha Interferon

Jianping Wang{dagger} and Iain L. Campbell*

Department of Neuropharmacology, The Scripps Research Institute, La Jolla, California 92037

Received 15 November 2004/ Accepted 3 March 2005

Alpha/beta interferons (IFNs-{alpha}/ß) are cytokines that play an essential role in the host defense against viral infection. Our previous studies have shown that the key IFN signaling molecule STAT1 is highly elevated and activated in central nervous system neurons during viral infection and in transgenic mice with astrocyte production of IFN-{alpha} (glial fibrillary acidic protein [GFAP]-IFN-{alpha}), suggesting that neurons are a very responsive target cell population for IFNs. To elucidate the genomic response of neurons to IFN-{alpha}, we undertook studies both in vitro and in vivo. Gene chip analysis was applied to RNA from IFN-{alpha}-treated or untreated primary cortical neuronal cultures derived from embryonic day 15 fetal wild-type or STAT1 knockout (KO) mice. The expression of 51 known and 5 unknown genes was increased significantly by more than twofold after exposure of wild-type but not STAT1 KO neurons to IFN-{alpha}. Some more highly expressed genes included IFN-induced 15-kDa protein, ubiquitin-specific protease 18, glucocorticoid attenuated response genes, IFN-induced GTPases, and the chemokine CXCL10. For several of these genes, the gene chip findings were confirmed by RNase protection assays. In addition, examination of the expression of some of these selected genes revealed that they were increased in neurons in the brain of either GFAP-IFN-{alpha} mice or mice infected with lymphocytic choriomeningitis virus. In conclusion, our study revealed a robust STAT1-dependent genomic response of neurons to IFN-{alpha}, highlighting an innate potential of these cells to defend against viral infection in the brain.

* Corresponding author. Present address: School of Molecular and Microbial Biosciences, G08, University of Sydney, NSW 2006, Australia. Phone: 61 2 9351 4676. Fax: 61 2 9351 4726. E-mail: icamp{at}mmb.usyd.edu.au.

{dagger} Present address: Department of Pharmacology, University of Missouri—Kansas City, Kansas City, MO 64108.

Journal of Virology, July 2005, p. 8295-8302, Vol. 79, No. 13
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.13.8295-8302.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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