EIF4A3-Induced circARHGAP29 Promotes Aerobic Glycolysis in Docetaxel-Resistant Prostate Cancer through IGF2BP2/c-Myc/LDHA Signaling

Docetaxel-based chemotherapy is a standard-of-care treatment for metastatic prostate cancer, and chemoresistance remains a major challenge in clinical practice. Recent studies have demonstrated that circular RNAs (circRNA) play critical roles in the development and progression of prostate cancer. Ho...

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Veröffentlicht in:Cancer research (Chicago, Ill.) Ill.), 2022-03, Vol.82 (5), p.831-845
Hauptverfasser: Jiang, Xingkang, Guo, Shanqi, Wang, Shuo, Zhang, Yangyi, Chen, Haojie, Wang, Yong, Liu, Ranlu, Niu, Yuanjie, Xu, Yong
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container_end_page 845
container_issue 5
container_start_page 831
container_title Cancer research (Chicago, Ill.)
container_volume 82
creator Jiang, Xingkang
Guo, Shanqi
Wang, Shuo
Zhang, Yangyi
Chen, Haojie
Wang, Yong
Liu, Ranlu
Niu, Yuanjie
Xu, Yong
description Docetaxel-based chemotherapy is a standard-of-care treatment for metastatic prostate cancer, and chemoresistance remains a major challenge in clinical practice. Recent studies have demonstrated that circular RNAs (circRNA) play critical roles in the development and progression of prostate cancer. However, the biological roles and potential functions of circRNAs in mediating docetaxel-resistant prostate cancer have yet to be well elucidated. In this study, we analyzed the expression profiles of circRNAs in docetaxel-resistant and -sensitive prostate cancer cells through RNA sequencing and found that expression of circARHGAP29 was significantly upregulated in docetaxel-resistant cell lines and clinical samples. Ectopic expression of circARHGAP29 triggered docetaxel resistance and aerobic glycolysis in prostate cancer cells, which was reduced by silencing circARHGAP29. Moreover, eukaryotic initiation factor 4A3, which bound the back-spliced junction site and the downstream flanking sequence of circARHGAP29, induced cyclization and cytoplasmic export of circARHGAP29. circARHGAP29 increased the stability of lactate dehydrogenase A (LDHA) mRNA by strengthening its interaction with insulin-like growth factor 2 mRNA-binding protein 2, leading to enhanced glycolytic metabolism. In addition, circARHGAP29 interacted with and stabilized c-Myc mRNA and protein, which further increased LDHA expression by facilitating its transcription. These findings reveal the crucial function of circARHGAP29 in prostate cancer glycolysis by increasing and stabilizing LDHA mRNA, providing a promising therapeutic target in docetaxel-resistant prostate cancer. Upregulation of a novel circRNA, circARHGAP29, promotes docetaxel resistance and glycolytic metabolism, suggesting it could be a prognostic biomarker and therapeutic target in chemoresistant prostate cancer.
doi_str_mv 10.1158/0008-5472.CAN-21-2988
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Recent studies have demonstrated that circular RNAs (circRNA) play critical roles in the development and progression of prostate cancer. However, the biological roles and potential functions of circRNAs in mediating docetaxel-resistant prostate cancer have yet to be well elucidated. In this study, we analyzed the expression profiles of circRNAs in docetaxel-resistant and -sensitive prostate cancer cells through RNA sequencing and found that expression of circARHGAP29 was significantly upregulated in docetaxel-resistant cell lines and clinical samples. Ectopic expression of circARHGAP29 triggered docetaxel resistance and aerobic glycolysis in prostate cancer cells, which was reduced by silencing circARHGAP29. Moreover, eukaryotic initiation factor 4A3, which bound the back-spliced junction site and the downstream flanking sequence of circARHGAP29, induced cyclization and cytoplasmic export of circARHGAP29. circARHGAP29 increased the stability of lactate dehydrogenase A (LDHA) mRNA by strengthening its interaction with insulin-like growth factor 2 mRNA-binding protein 2, leading to enhanced glycolytic metabolism. In addition, circARHGAP29 interacted with and stabilized c-Myc mRNA and protein, which further increased LDHA expression by facilitating its transcription. These findings reveal the crucial function of circARHGAP29 in prostate cancer glycolysis by increasing and stabilizing LDHA mRNA, providing a promising therapeutic target in docetaxel-resistant prostate cancer. 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subjects Cell Line, Tumor
Cell Proliferation
DEAD-box RNA Helicases - genetics
Docetaxel - pharmacology
Eukaryotic Initiation Factor-4A - genetics
Gene Expression Regulation, Neoplastic
Glycolysis - genetics
Humans
Lactate Dehydrogenase 5
Male
Prostatic Neoplasms - pathology
RNA, Circular - genetics
RNA, Messenger - genetics
RNA-Binding Proteins - genetics
RNA-Binding Proteins - metabolism
title EIF4A3-Induced circARHGAP29 Promotes Aerobic Glycolysis in Docetaxel-Resistant Prostate Cancer through IGF2BP2/c-Myc/LDHA Signaling
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