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High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes
Published on: March 24, 2015
Biologic consequences of Stat1-independent IFN signaling
1Department of Pathology and Immunology, Center for Immunology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
Summary
Interferon signaling pathways, independent of Stat1, regulate cell proliferation and antiviral responses in mononuclear phagocytes. These Stat1-independent pathways have significant physiological consequences.
Area of Science:
- Immunology
- Cell Biology
- Virology
Background:
- Signal transducer and activator of transcription 1 (Stat1) is crucial for many interferon (IFN)-dependent responses.
- Previous studies indicated that IFNgamma can function independently of Stat1 in tumor cells and fibroblasts.
- The role of Stat1-independent IFN signaling in mononuclear phagocytes remained largely unexplored.
Purpose of the Study:
- To investigate the role of Stat1-independent signaling pathways in IFNgamma and IFNalpha/beta responses in mononuclear phagocytes.
- To identify genes regulated by Stat1-independent IFNgamma signaling.
- To assess the physiological relevance of these alternative signaling pathways in antiviral immunity.
Main Methods:
- Utilized representational difference analysis and gene arrays to identify differentially expressed genes.
- Studied proliferative responses in mononuclear phagocyte lineage cells derived from Stat1-null mice.
- Monitored gene and protein expression changes, as well as functional outcomes.
- Assessed antiviral responses in Stat1-null mice.
Main Results:
- Both IFNgamma and IFNalpha/beta regulate proliferative responses in mononuclear phagocytes independently of Stat1.
- IFNgamma regulates numerous genes in a Stat1-independent manner in these cells.
- Regulation of these genes requires the IFNgamma receptor and Jak1.
- Stat1-independent IFN signaling contributes to physiological antiviral responses.
Conclusions:
- IFN receptors utilize alternative Stat1-independent signaling pathways.
- These pathways are critical for regulating mononuclear phagocyte proliferation and antiviral immunity.
- Stat1-independent signaling has significant physiological consequences, expanding our understanding of interferon biology.
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