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Updated: May 16, 2025

Monitoring the Cancer-Immunity Cycle and Exploring Tumor Microenvironment Dynamics
Published on: June 7, 2024
RNA modifications in the tumor microenvironment: insights into the cancer-immunity cycle and beyond
You-Peng Ding1, Cui-Cui Liu1, Ke-Da Yu2
1Department of Breast Surgery, Key Laboratory of Breast Cancer in Shanghai, Cancer Institute, Department of Oncology, Shanghai Medical College, Fudan University Shanghai Cancer Center, Fudan University, Shanghai, 200032, China.
Abstract:
The chemical modification of biological molecules is a critical regulatory mechanism for controlling molecular functions. Although research has long focused on DNA and proteins, RNA modifications have recently attracted substantial interest with the advancement in detection technologies. In oncology, many studies have identified dysregulated RNA modifications including m6A, m1A, m5C, m7G, pseudouridylation and A to I editing, leading to disrupted downstream pathways. As the concept of the tumor microenvironment has gained prominence, studies have increasingly examined the role of RNA modifications in this context, focusing on interactions among cancer cells, immune cells, stromal cells, and other components. Here we review the RNA modifications in the tumor microenvironment through the perspective of the Cancer-Immunity Cycle. The extracellular RNA modifications including exosomes and influence of microbiome in RNA modifications are potential research questions. Additionally, RNA modifying enzymes including FTO, ALKBH5, METTL3, PUS7 are under investigation as potential biomarkers and targets for combination with immunotherapies. ADCs and mimetics of modified RNA could be potential novel drugs. This review discusses the regulatory roles of RNA modifications within the tumor microenvironment.
Insights
RNA modifications are crucial in cancer, impacting the tumor microenvironment and immune response. Targeting RNA modifying enzymes and exploring extracellular RNA present new therapeutic avenues in oncology.
Area of Science:
- Molecular Biology
- Oncology
- Immunology
Background:
- Chemical modifications regulate biological molecule functions, with RNA modifications gaining attention due to advanced detection.
- Dysregulated RNA modifications (m6A, m1A, m5C, m7G, pseudouridylation, A to I editing) are implicated in cancer.
- The tumor microenvironment's role is increasingly studied in relation to RNA modifications.
Purpose of the Study:
- To review RNA modifications within the tumor microenvironment.
- To connect RNA modifications to the Cancer-Immunity Cycle.
- To highlight emerging research questions and therapeutic strategies.
Main Methods:
- Literature review focusing on RNA modifications in cancer.
- Analysis of RNA modifications through the lens of the Cancer-Immunity Cycle.
- Discussion of RNA modifying enzymes and novel drug modalities.
Main Results:
- RNA modifications significantly influence interactions within the tumor microenvironment.
- Extracellular RNA modifications and microbiome influence are key areas for future research.
- RNA modifying enzymes (FTO, ALKBH5, METTL3, PUS7) show potential as biomarkers and therapeutic targets.
Conclusions:
- RNA modifications play a critical regulatory role in the tumor microenvironment.
- Targeting RNA modifying enzymes offers potential for combination immunotherapies.
- Antibody-drug conjugates (ADCs) and modified RNA mimetics represent novel therapeutic strategies.
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