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Loss of miR-200c-3p promotes resistance to radiation therapy via the DNA repair pathway in prostate cancer
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Loss of miR-200c-3p promotes resistance to radiation therapy via the DNA repair pathway in prostate cancer
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Loss of miR-200c-3p promotes resistance to radiation therapy via the DNA repair pathway in prostate cancer
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Journal Article
Loss of miR-200c-3p promotes resistance to radiation therapy via the DNA repair pathway in prostate cancer
2024
Overview
Radiotherapy represents a major curative treatment for prostate cancer (PCa), but some patients will develop radioresistance (RR) and relapse. The underlying mechanisms remain poorly understood, and miRNAs might be key players in the acquisition and maintenance of RR. Through their encapsulation in small extracellular vesicles (EVs), they can also be relevant biomarkers of radiation response. Using next-generation sequencing, we found that miR-200c-3p was downregulated in PCa RR cells and in their small EVs due to a gain of methylation on its promoter during RR acquisition. We next showed that its exogenous overexpression restores the radiosensitivity of RR cells by delaying DNA repair through the targeting of HP1α. Interestingly, we also observed downregulation of miR-200c-3p expression by DNA methylation in radiation-resistant lung and breast cancer cell lines. In summary, our study demonstrates that the downregulation of miR-200c-3p expression in PCa cells and in their small EVs could help distinguish radioresistant from sensitive tumor cells. This miRNA targets HP1α to delay DNA repair and promote cell death.
Publisher
Nature Publishing Group UK,Springer Nature B.V,Nature Publishing Group
Subject
/ 14/19
/ 14/28
/ 38/22
/ 38/23
/ 38/77
/ 38/91
/ 42/44
/ 82/29
/ 82/83
/ Biomedical and Life Sciences
/ Cancer
/ Gene Expression Regulation, Neoplastic
/ Humans
/ Male
/ miRNA
/ Prostatic Neoplasms - genetics
/ Prostatic Neoplasms - metabolism
/ Prostatic Neoplasms - pathology
/ Prostatic Neoplasms - radiotherapy
