Loss of EGFR signaling regulated miR-203 promotes prostate cancer bone metastasis and tyrosine kinase inhibitors resistance.
Activation of EGFR signaling pathway leads to prostate cancer bone metastasis; however, therapies targeting EGFR have demonstrated limited effectiveness and led to drug resistance. miR-203 levels are down-regulated in clinical samples of primary prostate cancer and further reduced in metastatic prostate cancer. Here we show that ectopic miR-203 expression displayed reduced bone metastasis and induced sensitivity to tyrosine kinase inhibitors (TKIs) treatment in a xenograft model. Our results demonstrate that the induction of bone metastasis and TKI resistance require miR-203 down regulation, activation of the EGFR pathway via altered expression of EGFR ligands (EREG and TGFA) and anti-apoptotic proteins (API5, BIRC2, and TRIAP1). Importantly, a sufficient reconstitution of invasiveness and resistance to TKIs treatment was observed in cells transfected with anti-miR-203. In prostate cancer patients, our data showed that miR-203 levels were inversely correlated with the expression of two EGFR ligands, EREG and TGFA, and an EGFR dependent gene signature. Our results support the existence of a miR-203, EGFR, TKIs resistance regulatory network in prostate cancer progression. We propose that the loss of miR-203 is a molecular link in the progression of prostate cancer metastasis and TKIs resistance characterized by high EGFR ligands output and anti-apoptotic proteins activation.
Duke Scholars
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Related Subject Headings
- ras Proteins
- Transforming Growth Factor alpha
- Signal Transduction
- Proto-Oncogene Proteins p21(ras)
- Proto-Oncogene Proteins
- Protein Kinase Inhibitors
- Prostatic Neoplasms
- Neoplasm Metastasis
- Molecular Sequence Data
- MicroRNAs
Citation
Published In
DOI
EISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- ras Proteins
- Transforming Growth Factor alpha
- Signal Transduction
- Proto-Oncogene Proteins p21(ras)
- Proto-Oncogene Proteins
- Protein Kinase Inhibitors
- Prostatic Neoplasms
- Neoplasm Metastasis
- Molecular Sequence Data
- MicroRNAs