Conditional Stat2 Knockout Mice as a Platform for Modeling Human Diseases.

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• Signal transducer and activator of transcription 2 (STAT2) is essential for type I interferon (IFN-I/III) signaling.
• This pathway is critical for host defense against viral infections and cancer, and for regulating immune responses.

Purpose of the Study:

• To expand the utility of conditional Stat2 knockout (KO) mouse models.
• To validate tissue-specific STAT2 ablation and explore its functional roles in various contexts.

Main Methods:

• Generation of tissue-specific Stat2 KO mice by crossing floxed Stat2 mice with Cre-driver lines (CMV-Cre, Cdx2-Cre, CD11c-Cre).
• Validation of STAT2 deletion using PCR genotyping and Western blotting.
• Assessment of IFN-I signaling pathway function via IFN-β stimulation and analysis of target gene induction.
• Evaluation of STAT2's role in anti-tumor efficacy and antiviral responses in vivo and in vitro.

Main Results:

• STAT2 deletion was confirmed in target tissues of the generated KO models.
• STAT2-deficient cells showed impaired induction of IFN-I target genes upon IFN-β stimulation.
• Global Stat2 deletion significantly reduced the effectiveness of IFN-β in anti-tumor treatments.
• Lung fibroblasts from Stat2 KO mice exhibited defective antiviral responses to IFN-β.

Conclusions:

• The developed tissue-specific Stat2 KO models are valuable tools for studying STAT2 function.
• These models enable the dissection of STAT2-dependent signaling in a tissue- and disease-specific manner.
• STAT2 plays a significant role in mediating anti-tumor and antiviral responses through IFN-I signaling.