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Updated: Jun 12, 2025
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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
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Alternative cGAS signaling promotes herpes simplex encephalitis.
Liraz Shmuel-Galia1, Zhaozhao Jiang1, Laurel Stine1
1Division of Innate Immunity, Department of Medicine, University of Massachusetts Chan Medical School, Worcester, MA 01605.
Summary
Cyclic GMP-AMP synthase (cGAS) has a newly discovered signaling pathway independent of cGAMP. This alternative pathway enhances CXCL1 expression and neutrophil recruitment, impacting viral infections.
Area of Science:
- Immunology
- Molecular Biology
- Virology
Background:
- Foreign DNA detection by cyclic GMP-AMP synthase (cGAS) triggers immune responses.
- Dysregulated cGAS activity is linked to autoimmune and neurodegenerative diseases.
- The role of cGAS independent of cGAMP signaling was previously undefined.
Purpose of the Study:
- To investigate if cGAS can signal independently of its known product, cGAMP.
- To characterize the functional consequences of this alternative cGAS signaling pathway.
Main Methods:
- Investigated cGAS signaling pathways.
- Analyzed CXCL1 expression and neutrophil recruitment in response to cGAS activation.
- Utilized a herpes simplex encephalitis model.
Main Results:
- Identified an alternative signaling pathway utilized by cGAS, independent of cGAMP synthesis.
- Demonstrated that this alternative pathway promotes CXCL1 hyperexpression.
- Showed enhanced neutrophil recruitment facilitating viral dissemination in herpes simplex encephalitis.
Conclusions:
- cGAS possesses a scaffold function, mediating signaling independently of cGAMP.
- This alternative cGAS pathway plays a role in antiviral responses and disease pathogenesis.
- Highlights a novel therapeutic target beyond cGAMP for cGAS-related diseases.
