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Published on: December 28, 2017
MicroRNA miR-374, a potential radiosensitizer for carbon ion beam radiotherapy
Sung-Jae Baek1, Katsutoshi Sato2, Naohiro Nishida3
1Department of Radiation Oncology, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan.
Abstract:
In this study, we compared the microRNA (miRNA) profiles of a control and X-ray- and carbon ion beam-resistant cells to identify miRNAs that can be used as radiosensitizers and biomarkers. Mouse squamous cell carcinoma line NR-S1, its X-ray-resistant derivative X60, and its carbon ion beam‑resistant derivative C30 were subjected to miRNA microarray analysis. Expression of miRNAs shown to be upregulated or downregulated in the microarray analysis was confirmed by qRT-PCR. Downregulated miRNAs were overexpressed in human pancreatic cancer cell lines PANC1 and MIA PaCa-2, and the resulting cells were tested for radiosensitivity using colony-forming and sphere-forming assays. Of 1,265 miRNAs analyzed, 4 were downregulated and 11 were upregulated in X-ray-resistant and carbon ion beam-resistant cells. Two of the downregulated miRNAs, miR-196 and miR-374, were selected for overexpression in PANC1 and MIA PaCa-2 cells. Overexpression of miR-374 sensitized PANC-1 and MIA PaCa-2 cells toward carbon ion beam radiation. miRNA miR-374 has the potential to be a new radiosensitizer for carbon ion beam radiotherapy and a new biomarker to determine the optimal treatment for cancer.
Insights
MicroRNA miR-374 can enhance carbon ion beam therapy effectiveness. This study identified miR-374 as a potential radiosensitizer and biomarker for optimizing cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Radiotherapy
Background:
- Radiotherapy resistance is a significant challenge in cancer treatment.
- Identifying novel radiosensitizers and biomarkers is crucial for improving patient outcomes.
Purpose of the Study:
- To compare microRNA (miRNA) profiles of radiation-resistant cells to identify potential radiosensitizers and biomarkers.
- To investigate the role of specific miRNAs in modulating cellular response to X-ray and carbon ion beam radiation.
Main Methods:
- MicroRNA microarray analysis of mouse squamous cell carcinoma lines and their radio-resistant derivatives.
- Quantitative reverse transcription polymerase chain reaction (qRT-PCR) for miRNA expression validation.
- Overexpression of selected miRNAs in human pancreatic cancer cell lines (PANC1, MIA PaCa-2).
- Radiosensitivity assessment using colony-forming and sphere-forming assays.
Main Results:
- 1,265 miRNAs were analyzed, with 4 downregulated and 11 upregulated in resistant cells.
- Overexpression of miR-374 in PANC1 and MIA PaCa-2 cells sensitized them to carbon ion beam radiation.
- miR-196 and miR-374 were identified as downregulated miRNAs in radio-resistant cells.
Conclusions:
- MicroRNA miR-374 demonstrates potential as a radiosensitizer for carbon ion beam radiotherapy.
- miR-374 may serve as a novel biomarker for determining optimal cancer treatment strategies.
- This research opens avenues for developing targeted therapies to overcome radiation resistance.
