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2017 ; 7
(1
): 10932
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MiR-338-5p enhances the radiosensitivity of esophageal squamous cell carcinoma by
inducing apoptosis through targeting survivin
#MMPMID28883406
Park M
; Yoon HJ
; Kang MC
; Kwon J
; Lee HW
Sci Rep
2017[Sep]; 7
(1
): 10932
PMID28883406
show ga
Radioresistance is a challenge in the treatment of esophageal squamous cell
carcinoma (ESCC). MicroRNAs (miRNAs) are known to play an important role in the
functional modification of cancer cells and recent studies have reported
miRNA-mediated radiotherapy resistance. However, further research is necessary to
reveal the regulation mechanisms, and treatment strategies using miRNA are yet to
be established for ESCC. We compared the miRNA expression profiles of ESCC
parental (TE-4) and acquired radioresistance (TE-4R) cell lines using a miRNA
microarray and qRT-PCR. Our data showed that miR-338-5p, one of the target miRNA
biomarkers, was significantly downregulated in TE-4R. Ectopic overexpression of
miR-338-5p induced apoptosis and sensitivity to radiation treatment by
interfering with survivin, which is a known inhibitor of apoptosis.
Overexpression of survivin reversed miR-338-5p-induced apoptosis. Tumor xenograft
experiments indicated that therapeutic delivery of the miR-338-5p mimics via
direct injection into tumor mass increased sensitivity to radiation therapy. In
conclusion, our findings suggest that miR-338-5p is a potential radiosensitizer
and may be a therapeutic biomarker for radioresistant in ESCC.