miR-375 inhibits cell growth and correlates with clinical outcomes in tongue squamous cell carcinoma

• Published in: Oncology reports Vol. 33; no. 4; pp. 2061 - 2071
• Main Authors: JIA, LINGFEI, HUANG, YIPING, ZHENG, YUNFEI, LYU, MINGYUE, ZHANG, CHUNAN, MENG, ZHEN, GAN, YEHUA, YU, GUANGYAN
• Format: Journal Article
• Language: English
• Published: Greece D.A. Spandidos 01.04.2015; Spandidos Publications; Spandidos Publications UK Ltd
• Subjects: 3' Untranslated Regions; Biomarkers; Cancer; Carcinoma, Squamous Cell - diagnosis; Carcinoma, Squamous Cell - genetics; Cell cycle; Cell Cycle - genetics; Cell growth; Cell Line, Tumor; Cell Proliferation - genetics; Clinical outcomes; Cloning; cyclin D1; Cyclin D1 - genetics; Deoxyribonucleic acid; DNA; Down-Regulation - genetics; Female; Gene expression; Gene Expression Regulation, Neoplastic - genetics; Genetic aspects; Growth; Health aspects; Humans; Male; Medical prognosis; Metastasis; MicroRNA; MicroRNAs - genetics; Middle Aged; miR-375; miRNA; Mouth cancer; Multivariate analysis; Mutagenesis; Oral cancer; Patient outcomes; Prognosis; Proteins; Sp1; Sp1 Transcription Factor - genetics; Squamous cell carcinoma; Studies; Tongue Neoplasms - diagnosis; Tongue Neoplasms - genetics; tongue squamous cell carcinoma; Transcription factors
• ISSN: 1021-335X; 1791-2431
• DOI: 10.3892/or.2015.3759

miR-375 has been implicated in various types of cancers. However, its role in tongue squamous cell carcinoma (TSCC) remains unclear. This study aimed to investigate the effects of miR-375 on cell growth and the prognosis of TSCC patients. Using quantitative reverse transcription-polymerase chain reaction, we evaluated miR-375 expression in TSCC samples and TSCC cell lines. The results showed that miR-375 expression was significantly reduced in the TSCC tissues and cell lines. A low level expression of miR-375 in TSCC patients was related to poor of prognosis. Moreover, the effects of miR-375 overexpression on cell proliferation, the cell cycle and the expression of Sp1 and cyclin D1 were examined in TSCC cells. We demonstrated that overexpression of miR-375 significantly inhibited the cell proliferation and cell cycle progression in TSCC cell lines. Overexpression of miR-375 inhibited Sp1 expression by targeting the 3′ untranslated region of the Sp1 transcript. The knockdown of Sp1 expression resulted in the subsequent downregulation of cyclin D1. Taken together, our study suggests that miR-375 inhibits the cell growth, and its expression is correlated with clinical outcomes in TSCC.