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MiRNA differentially expressed between DU145 sensitive et resistant extracellular vesicles to irradiation

ABSTRACT: miRNA differentially expressed between DU145 sensitive et resistant extracellular vesicles to irradiation

PROVIDER: PRJNA1119531 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR29269600.fastq.gz	Fastqsanger.gz
	SRR29269700.fastq.gz	Fastqsanger.gz
	SRR29269601.fastq.gz	Fastqsanger.gz
	SRR29269701.fastq.gz	Fastqsanger.gz
	SRR29269602.fastq.gz	Fastqsanger.gz

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miRNA differentially expressed between DU145 sensitive et resistant extracellular vesicles to irradiation

Project description: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.

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