EGFR-mediated Rad51 expression potentiates intrinsic resistance in prostate cancer via EMT and DNA repair pathways
| Autor: | Mohit Rajput, Rana P. Singh, Ragini Singh, Navneendra Singh |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Male
Epithelial-Mesenchymal Transition DNA Repair DNA damage DNA repair Morpholines Vimentin General Biochemistry Genetics and Molecular Biology Prostate cancer Erlotinib Hydrochloride DU145 Radioresistance medicine Humans General Pharmacology Toxicology and Pharmaceutics Clonogenic assay EGFR inhibitors biology Chemistry Prostatic Neoplasms General Medicine medicine.disease ErbB Receptors Chromones Drug Resistance Neoplasm Cancer research biology.protein Rad51 Recombinase DNA Damage |
| Zdroj: | Life sciences. 286 |
| ISSN: | 1879-0631 |
| Popis: | Aim To study the role of EGFR signaling in regulation of intrinsic resistance in prostate cancer. Materials and methods Radioresistant prostate carcinoma DU145 and PC-3 cells were used to study the effect of shRNA-mediated knockdown of EGFR on intrinsic radioresistance mechanisms. Semi-quantitative PCR, western blotting, growth kinetics, colony formation, transwell migration, invasion and trypan blue assays along with inhibitors erlotinib, NU7441, B02, PD98059 and LY294002 were used. Key findings EGFR knock-down induced morphological alterations along with reduction in clonogenic potential and cell proliferation in DU145 cells. Migratory potential of prostate cancer cells were reduced concomitant with upregulation of epithelial marker, E-cadherin and decreased expression of mesenchymal markers, vimentin and snail. Further, EGFR knock-down decreased the expression of Rad51 and DNA-PK at mRNA as well as protein levels. Likewise, erlotinib, an EGFR inhibitor, and NU7441, a DNA-PK inhibitor increased the expression of E-cadherin and decreased the level of vimentin. Both these inhibitors also decreased the levels of DNA damage regulatory protein Rad51. Further, Rad51 inhibitor, B02, inhibited the clonogenic potential, cell migration and reduced the expression of vimentin, Ku70 and Ku80, and also, B02 radiosensitized DU145 cells. EGFR-regulated expression of Rad51 was found to be mediated via PI3K/Akt and Erk1/2 pathways. Significance EGFR was found to regulate DNA damage repair, survival and EMT responses in prostate cancer cells through transcriptional regulation of Rad51. A novel role of EGFR-Erk1/2/Akt-Rad51 axis through modulation of EMT and DNA repair pathways in prostate cancer resistance mechanisms is suggested. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect