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RNA-seq profiling of a radiation resistant and radiation sensitive prostate cancer cell line highlights opposing regulation of DNA repair and targets for radiosensitization

Citation

Young, A and Berry, R and Holloway, AF and Blackburn, NB and Dickinson, JL and Skala, M and Phillips, JL and Brettingham-Moore, KH, RNA-seq profiling of a radiation resistant and radiation sensitive prostate cancer cell line highlights opposing regulation of DNA repair and targets for radiosensitization, BMC Cancer, 14 Article 808. ISSN 1471-2407 (2014) [Refereed Article]


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Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1186/1471-2407-14-808

Abstract

Background: Radiotherapy is a chosen treatment option for prostate cancer patients and while some tumours respond well, up to 50% of patients may experience tumour recurrence. Identification of functionally relevant predictive biomarkers for radioresponse in prostate cancer would enable radioresistant patients to be directed to more appropriate treatment options, avoiding the side-effects of radiotherapy.

Methods: Using an in vitro model to screen for novel biomarkers of radioresistance, transcriptome analysis of a radioresistant (PC-3) and radiosensitive (LNCaP) prostate cancer cell line was performed. Following pathway analysis candidate genes were validated using qRT-PCR. The DNA repair pathway in radioresistant PC-3 cells was then targeted for radiation sensitization using the PARP inhibitor, niacinimide.

Results: Opposing regulation of a DNA repair and replication pathway was observed between PC-3 and LNCaP cells from RNA-seq analysis. Candidate genes BRCA1, RAD51, FANCG, MCM7, CDC6 and ORC1 were identified as being significantly differentially regulated post-irradiation. qRT-PCR validation confirmed BRCA1, RAD51 and FANCG as being significantly differentially regulated at 24 hours post radiotherapy (p-value = 0.003, 0.045 and 0.003 respectively). While the radiosensitive LNCaP cells down-regulated BRCA1, FANCG and RAD51, the radioresistant PC-3 cell line up-regulated these candidates to promote cell survival post-radiotherapy and a similar trend was observed for MCM7, CDC6 and ORC1. Inhibition of DNA repair using niacinamide sensitised the radioresistant cells to irradiation, reducing cell survival at 2 Gy from 66% to 44.3% (p-value = 0.02).

Conclusions: These findings suggest that the DNA repair candidates identified via RNA-seq hold potential as both targets for radiation sensitization and predictive biomarkers in prostate cancer.

Item Details

Item Type:Refereed Article
Keywords:RNA-seq, prostate cancer, radiation response, DNA repair
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Gene Expression (incl. Microarray and other genome-wide approaches)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Young, A (Miss Arabella Young)
Author:Berry, R (Ms Rachael Berry)
Author:Holloway, AF (Dr Adele Holloway)
Author:Blackburn, NB (Mr Nicholas Blackburn)
Author:Dickinson, JL (Associate Professor Joanne Dickinson)
Author:Phillips, JL (Ms Jessica Phillips)
Author:Brettingham-Moore, KH (Dr Kate Brettingham-Moore)
ID Code:96661
Year Published:2014
Web of Science® Times Cited:5
Deposited By:Medicine (Discipline)
Deposited On:2014-11-14
Last Modified:2017-11-02
Downloads:217 View Download Statistics

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