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Updated: Jul 17, 2025

Sequencing Small Non-coding RNA from Formalin-fixed Tissues and Serum-derived Exosomes from Castration-resistant Prostate Cancer Patients
Published on: November 19, 2019
m6A-Mediated Biogenesis of circDDIT4 Inhibits Prostate Cancer Progression by Sequestrating ELAVL1/HuR
Zhe Kong1, Yali Lu1, Yue Yang1
1Obstetrics and Gynecology Hospital of Fudan University, State Key Lab of Genetic Engineering, MOE Engineering Research Center of Gene Technology, School of Life Sciences, Key Laboratory of Reproduction Regulation of NPFPC (SIPPR, IRD), Fudan University, Shanghai, P.R. China.
Circular RNA DDIT4 (circDDIT4) suppresses prostate cancer by sponging ELAVL1/HuR, reducing anoctamin 7 (ANO7) expression. N6-methyladenosine (m6A) modification regulates circDDIT4 levels, impacting cancer progression.
Area of Science:
- Molecular Oncology
- RNA Biology
- Cancer Genomics
Background:
- The role of circular RNA DDIT4 (circDDIT4) in prostate cancer remains unclear.
- Circular RNAs are increasingly recognized for their regulatory functions in various diseases, including cancer.
Purpose of the Study:
- To investigate the function and regulatory mechanisms of circDDIT4 in prostate cancer.
- To elucidate the role of circDDIT4 in prostate cancer progression and its interaction with other molecular players.
Main Methods:
- Analysis of circDDIT4 expression in prostate cancer tissues.
- In vitro and in vivo experiments to assess circDDIT4's tumor suppressor activity.
- RNA immunoprecipitation and Western blotting to study protein-RNA interactions.
- Investigation of N6-methyladenosine (m6A) modification's role in circDDIT4 biogenesis.
Main Results:
- circDDIT4 is downregulated in prostate cancer and acts as a tumor suppressor.
- circDDIT4 competitively binds to ELAV-like RNA binding protein 1 (ELAVL1/HuR), decreasing anoctamin 7 (ANO7) expression.
- This interaction promotes apoptosis and inhibits proliferation and metastasis of prostate cancer cells.
- N6-methyladenosine (m6A) modification, regulated by WTAP/METTL3/METTL14 and FTO, influences circDDIT4 biogenesis.
Conclusions:
- circDDIT4 functions as a tumor suppressor in prostate cancer by regulating the circDDIT4-ELAVL1/HuR-ANO7 axis.
- Abnormal m6A modification promotes prostate cancer via a circular RNA-protein-cell signaling network.
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