Roles of circRNAs in regulating the tumor microenvironment

Area of Science:

• Molecular Biology
• Oncology
• Biochemistry

Background:

• Circular RNAs (circRNAs) are prevalent non-coding RNAs with largely unexplored functions in eukaryotic cells.
• While known circRNAs act as microRNA sponges, bind RNA-binding proteins, or function as transcription factors, their roles in cancer are expanding.
• Tumor growth is complex, influenced by the tumor microenvironment (TME) beyond genetic mutations.

Purpose of the Study:

• To review the multifaceted roles of circRNAs within the TME.
• To elucidate how circRNAs regulate key aspects of tumor progression, including angiogenesis, matrix remodeling, and immunosuppression.
• To discuss the influence of hypoxia and commensal microorganisms on circRNA production and their impact on the TME.

Main Methods:

• Literature review of current research on circRNAs in cancer.
• Analysis of circRNA regulatory mechanisms (e.g., miRNA sponges, protein binding).
• Examination of circRNA involvement in TME components and processes.

Main Results:

• CircRNAs significantly regulate angiogenesis, matrix remodeling, and immunosuppression within the TME.
• Hypoxia and commensal microorganisms are identified as modulators of circRNA production, impacting tumor growth.
• circRNAs are implicated in tumor growth and metastasis through TME regulation.

Conclusions:

• Modulating the TME via circRNAs presents a promising therapeutic strategy for cancer.
• Further research into circRNA functions and their interactions within the TME is crucial for developing novel cancer treatments.
• Understanding circRNA dynamics offers insights into tumor progression and potential intervention points.