circGFRA1 and GFRA1 act as ceRNAs in triple negative breast cancer by regulating miR-34a.

Abstract:

BACKGROUD:Accumulating evidences indicate that circular RNAs (circRNAs), a class of non-coding RNAs, play important roles in tumorigenesis. However, the function of circRNAs in triple negative breast cancer (TNBC) is largely unknown. METHODS:We performed circRNA microarrays to identify circRNAs that are aberrantly expressed in TNBC cell lines. Expression levels of a significantly upregulated circRNA, circGFRA1, was detected by quantitative real-time PCR (qRT-PCR) in TNBC cell lines and tissues. Kaplan-Meier survival analysis was used to explore the significance of circGFRA1 in clinical prognosis. Then, we examined the functions of circGFRA1 in TNBC by cell proliferation, apoptosis and mouse xenograft assay. In addition, luciferase assay was used to explore the miRNA sponge function of circGFRA1 in TNBC. RESULTS:Microarray analysis and qRT-PCR verified a circRNA termed circGFRA1 that was upregulated in TNBC. Kaplan-Meier survival analysis showed that upregulated circGFRA1 was correlated with poorer survival. Knockdown of circGFRA1 inhibited proliferation and promoted apoptosis in TNBC. Via luciferase reporter assays, circGFRA1 and GFRA1 was observed to directly bind to miR-34a. Subsequent experiments showed that circGFRA1 and GFRA1 regulated the expression of each other by sponging miR-34a. CONCLUSIONS:Taken together, we conclude that circGFRA1 may function as a competing endogenous RNA (ceRNA) to regulate GFRA1 expression through sponging miR-34a to exert regulatory functions in TNBC. circGFRA1 may be a diagnostic biomarker and potential target for TNBC therapy.

journal_name

J Exp Clin Cancer Res

authors

He R,Liu P,Xie X,Zhou Y,Liao Q,Xiong W,Li X,Li G,Zeng Z,Tang H

doi

10.1186/s13046-017-0614-1

subject

Has Abstract

pub_date

2017-10-16 00:00:00

pages

145

issue

1

eissn

0392-9078

issn

1756-9966

pii

10.1186/s13046-017-0614-1

journal_volume

36

pub_type

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