Post-Transcriptional Up-Regulation of PDGF-C by HuR in Advanced and Stressed Breast Cancer

• Main Authors: Nian-An Luo, Ya-Qi Qu, Guo-Dong Yang, Tao Wang, Ren-Li Li, Lin-Tao Jia, Rui Dong
• Format: Article
• Language: English
• Published: MDPI AG 2014-11-01
• Series: International Journal of Molecular Sciences
• Subjects: breast neoplasms; HuR; mRNA stability; platelet-derived growth factor-C (PDGF-C)
• Online Access: http://www.mdpi.com/1422-0067/15/11/20306

Breast cancer is a heterogeneous disease characterized by multiple genetic alterations leading to the activation of growth factor signaling pathways that promote cell proliferation. Platelet-derived growth factor-C (PDGF-C) is overexpressed in various malignancies; however, the involvement of PDGF-C in breast cancers and the mechanisms underlying PDGF-C deregulation remain unclear. Here, we show that PDGF-C is overexpressed in clinical breast cancers and correlates with poor prognosis. PDGF-C up-regulation was mediated by the human embryonic lethal abnormal vision-like protein HuR, which stabilizes the PDGF-C transcript by binding to two predicted AU-rich elements (AREs) in the 3'-untranslated region (3'-UTR). HuR is up-regulated in hydrogen peroxide-treated or ultraviolet-irradiated breast cancer cells. Clinically, HuR levels are correlated with PDGF-C expression and histological grade or pathological tumor-node-metastasis (pTNM) stage. Our findings reveal a novel mechanism underlying HuR-mediated breast cancer progression, and suggest that HuR and PDGF-C are potential molecular candidates for targeted therapy of breast cancers.