Knockdown of circDENND4C inhibits glycolysis, migration and invasion by up-regulating miR-200b/c in breast cancer under hypoxia

• Published in: Journal of experimental & clinical cancer research Vol. 38; no. 1; p. 388
• Main Authors: Ren, Shasha, Liu, Jiuzhou, Feng, Yun, Li, Zhenyu, He, Liang, Li, Leilei, Cao, Xiaozhong, Wang, Zhenghua, Zhang, Yanwu
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 05.09.2019; BioMed Central; BMC
• Subjects: Adult; Aged; Animals; Anoxia; Breast cancer; Breast Neoplasms - genetics; Breast Neoplasms - metabolism; Breast Neoplasms - pathology; Cancer cells; Cancer metastasis; Cancer patients; Cancer research; Care and treatment; Cell Line, Tumor; Cell migration; Cell Movement - genetics; Cell Proliferation; circDENND4C; Computational biology; Development and progression; Disease Models, Animal; Female; Genetic aspects; Glucose; Glucose metabolism; Glycolysis; Guanine Nucleotide Exchange Factors - genetics; Humans; Hypoxia; Hypoxia - genetics; Hypoxia - metabolism; Lactates; Luciferase; Mice; MicroRNA; MicroRNAs - genetics; Middle Aged; Migration; miR-200b; miR-200c; Neoplasm Metastasis; Neoplasm Staging; Patient outcomes; Polymerase chain reaction; RNA; RNA, Circular - genetics; Tumors; Glycolysis; Breast cancer; miR-200b; miR-200c; Migration; circDENND4C
• ISSN: 1756-9966; 0392-9078; 1756-9966
• DOI: 10.1186/s13046-019-1398-2

Hypoxia is a key feature of breast cancer, which affects cancer development, metastasis and metabolism. Previous studies suggested that circular RNAs (circRNAs) could participate in cancer progression and hypoxia regulation. This study aimed to investigate the role of circRNA differentially expressed in normal cells and neoplasia domain containing 4C (circDENND4C) in breast cancer progression under hypoxia. Forty-three patients with breast cancer were involved in this study. Breast cancer cell lines MDA-MB-453 and SK-BR-3 were cultured under hypoxia (1% O ) for experiments in vitro. The expression levels of circDENND4C, microRNA-200b (miR-200b) and miR-200c were measured by quantitative real-time polymerase chain reaction. Glycolysis was investigated by glucose consumption, lactate production and hexokinase II (HK2) protein level. Migration and invasion were evaluated via trans-well assay and protein levels of matrix metallopeptidase 9 (MMP9) and MMP2. The interaction between circDENND4C and miR-200b or miR-200c was explored by bioinformatics analysis, luciferase assay and RNA immunoprecipitation. Murine xenograft model was established to investigate the anti-cancer role of circDENND4C in vivo. circDENND4C highly expressed in breast cancer was up-regulated in response to hypoxia. Knockdown of circDENND4C decreased glycolysis, migration and invasion in breast cancer cells under hypoxia. circDENND4C was validated as a sponge of miR-200b and miR-200c. Deficiency of miR-200b or miR-200c reversed the suppressive effect of circDENND4C knockdown on breast cancer progression. Moreover, silence of circDENND4C reduced xenograft tumor growth by increasing miR-200b and miR-200c. circDENND4C silence suppresses glycolysis, migration and invasion in breast cancer cells under hypoxia by increasing miR-200b and miR-200c.