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Context-dependent actions of STING pathway in colitis and associated colon cancer
Jiaorong Qu1, Yajie Cai2, Fanghong Li2
1School of Life Sciences, Beijing University of Chinese Medicine, Beijing 100029, China.
Abstract:
Inflammatory bowel disease (IBD), a prevalent chronic inflammatory disorder with unsatisfactory therapeutic outcomes, significantly increases the risk of colorectal cancer. The cyclic GMP-AMP synthase (cGAS) and stimulator of interferon gene (STING), highly expressed in human IBD, are potential anti-inflammatory and anti-tumor immunotherapeutic targets. However, conflicting evidence regarding the dual roles of the STING pathway has significantly hindered its development as a therapeutic target for innovative treatments. Previous studies have predominantly suggested that hyperactivation of the STING pathway contributes to colitis development, while simultaneously enhancing anti-tumor immunity and inhibiting cancer progression. On the other hand, specific contexts, such as STING deficiency in T cells or prolonged, excessive STING activation within tumors, paradoxically promote disease progression. We also thoroughly analyzed the origin of STING activation in these diseases to offer insights into the identification of novel druggable targets. Crucially, "cell context-dependency, treatment timing and duration, and biased signal transduction" are likely the mechanistic basis underlying STING pathway's dual roles, proposing spatiotemporal-specific STING modulators as future therapeutics.
Insights
The cyclic GMP-AMP synthase (cGAS) and stimulator of interferon gene (STING) pathway has dual roles in inflammatory bowel disease (IBD) and cancer. Understanding its context-dependent functions is key for developing targeted therapies.
Area of Science:
- Immunology
- Gastroenterology
- Oncology
Background:
- Inflammatory bowel disease (IBD) is a chronic inflammatory condition with increased colorectal cancer risk.
- The cyclic GMP-AMP synthase (cGAS) and stimulator of interferon gene (STING) pathway is implicated in IBD and cancer.
- Conflicting evidence exists regarding the STING pathway's role in disease pathogenesis and immunity.
Purpose of the Study:
- To analyze the dual roles of the STING pathway in inflammatory bowel disease (IBD) and colorectal cancer.
- To investigate the mechanistic basis for the STING pathway's context-dependent functions.
- To identify novel therapeutic targets within the STING pathway for IBD and cancer treatment.
Main Methods:
- Literature review and analysis of STING pathway activation in IBD and cancer models.
- Examination of studies investigating STING deficiency or hyperactivation in different cellular contexts.
- Analysis of signaling mechanisms underlying STING pathway's dual functions.
Main Results:
- STING pathway hyperactivation can promote colitis but enhance anti-tumor immunity.
- STING deficiency or excessive activation in specific contexts can paradoxically worsen disease.
- Origin of STING activation in IBD and cancer was analyzed to find druggable targets.
Conclusions:
- The STING pathway exhibits context-dependent dual roles in IBD and cancer, influenced by cell type, timing, and duration of activation.
- "Cell context-dependency, treatment timing and duration, and biased signal transduction" are key mechanistic factors.
- Spatiotemporal-specific STING modulators represent a promising therapeutic strategy for IBD and cancer.
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