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Transcriptome-based characterization of 3'2'-cGAMP signaling mediated immune responses
Yan Gao1,2, Gucheng Xu3, Munire Maimaiti2
1Central Laboratory, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China.
Computational and Structural Biotechnology Journal
|December 5, 2024
Summary
Cyclic dinucleotides (CDNs) like 3'2'-cGAMP activate immune responses via the STING pathway. This study reveals 3'2'-cGAMP’s transcriptional effects and potential autoimmune links, aiding adjuvant development.
Area of Science:
- Immunology
- Molecular Biology
- Vaccine Adjuvants
Background:
- Cyclic dinucleotides (CDNs) are crucial for immune responses, acting as adjuvants in vaccines and immunotherapy by activating the cGAS-STING pathway.
- Understanding CDN-induced immune responses is vital for developing effective vaccine adjuvants.
- 3'2'-cGAMP is a nuclease-resistant CDN with potential applications in immunotherapy.
Purpose of the Study:
- To characterize the immune responses elicited by 3'2'-cGAMP in mammalian immune cells using comparative transcriptome analysis.
- To investigate the STING-dependent mechanisms of 3'2'-cGAMP-mediated immune signaling.
- To identify potential side effects associated with 3'2'-cGAMP adjuvant use.
Main Methods:
- Comparative transcriptome analysis of mouse primary macrophages stimulated with 3'2'-cGAMP and 2'3'-cGAMP.
- Assessment of STING-dependent signaling pathways, including TBK1 and IRF3 phosphorylation and IFN-β induction.
- Integrative analysis of gene expression data to identify enriched pathways and associated biological processes.
Main Results:
- 3'2'-cGAMP robustly induced innate immune gene signatures in macrophages, comparable to 2'3'-cGAMP.
- Immune responses to 3'2'-cGAMP were largely STING-dependent, evidenced by reduced signaling in STING-deficient cells.
- 3'2'-cGAMP signaling preferentially induced STING-dependent genes related to nuclear transcription, nucleosome positioning, and epigenetic regulation.
- Enriched pathways included cellular senescence and HDAC-mediated histone deacetylation.
- A significant association was found between 3'2'-cGAMP-induced genes and autoimmune disease-related processes.
Conclusions:
- This study provides the first comprehensive transcriptional landscape of 3'2'-cGAMP signaling in mammals.
- 3'2'-cGAMP elicits STING-dependent immune responses with unique effects on nuclear processes and potential links to autoimmune diseases.
- Findings support the development of 3'2'-cGAMP as an adjuvant while highlighting the need for monitoring potential autoimmune side effects.
