Abstract | BACKGROUND/AIMS:
Circular RNAs ( circRNAs) are a class of non-coding RNAs. They have been proved to be critically involved in tumorigenesis and progression of malignancies through competing endogenous RNA ( ceRNA) mechanism. Nevertheless, the exploration between circRNAs and pathogenesis of breast cancer (BC) is limited. Previously, circ_0005230 was identified upregulated in BC tissues screened by circRNA microarray. In the present study, we aimed to investigate the expression pattern, functional role, and mechanism of circ_0005230 in BC. METHODS: qRT-PCR was conducted to elucidate the expression levels of circ_0005230 in BC tissues and cells. Additionally, the clinical severity and prognostic value were investigated. CCK-8, colony-forming, flow cytometric assays were performed. Animal study was conducted to validate the in vitro data. What's more, Transwell assays were induced to detect the cell metastatic properties of circ_0005230 exerts in BC cells. Luciferase reporter assay was used to measure the mechanism of circ_0005230. RESULTS: circ_0005230 was overexpressed in BC tissue specimens and cell lines. The overexpression of circ_0005230 was related to adverse phenotypes in the patients with BC. In addition, circ_0005230 could be regarded as a prognostic predictor in BC patients. In vitro and in vivo data demonstrated the cell growth promoting role of circ_0005230. Moreover, circ_0005230 could also promote cell migratory and invasive capacities. For the mechanism investigation, circ_0005230 was proved to be a sponge of miR-618, and expression of miR-618 could regulate CBX8 expression via targeting the 3'UTR of CBX8. Rescue assays also illustrated an oncogenic function of circ_0005230 in BC via acting as a miR-618 sponge to promote CBX8 expression. CONCLUSION: circ_0005230/miR-618/CBX8 axis might play a key role in BC tumorigenesis and development.
|
Authors | Yi Xu, Yue Yao, Kaiming Leng, Daolin Ji, Lijun Qu, Yueping Liu, Yunfu Cui |
Journal | Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology
(Cell Physiol Biochem)
Vol. 51
Issue 4
Pg. 1710-1722
( 2018)
ISSN: 1421-9778 [Electronic] Germany |
PMID | 30504704
(Publication Type: Journal Article)
|
Copyright | © 2018 The Author(s). Published by S. Karger AG, Basel. |
Chemical References |
- CBX8 protein, human
- MIRN618 microRNA, human
- MicroRNAs
- RNA, Circular
- RNA
- Polycomb Repressive Complex 1
|
Topics |
- Animals
- Breast Neoplasms
(diagnosis, genetics, pathology)
- Carcinogenesis
(genetics, pathology)
- Cell Line, Tumor
- Cell Proliferation
- Disease Progression
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Mice, Nude
- MicroRNAs
(genetics)
- Neoplasm Invasiveness
(diagnosis, genetics, pathology)
- Polycomb Repressive Complex 1
(genetics)
- Prognosis
- RNA
(genetics)
- RNA, Circular
- Up-Regulation
|