The pluripotency factor LIN28B is involved in oral carcinogenesis and associates with tumor aggressiveness and unfavorable prognosis

Cancer Cell International

Jie Cheng¹  Hongbing Jiang¹  Jianrong Yang¹  Jinhai Ye¹  Hua Yuan¹  Wei Zhang²  Chunping Yuan³  Zhongwu Li¹  Yanling Wang¹  Yuming Zhu³  Dongmiao Wang¹ 

[1] Jiangsu Key Laboratory of Oral Disease, Nanjing Medical University, Nanjing 210029, China;Department of Oral and Maxillofacial Pathology, Nanjing Medical University, Nanjing 210029, China;Department of Oral and Maxillofacial Surgery, Nanjing Medical University, Nanjing 210029, China

关键词: Tumor biomarker;    Oral carcinogenesis;    LIN28B;    Oral cancer;   

Others  :  1233581
DOI  :  10.1186/s12935-015-0252-7

 received in 2015-07-28, accepted in 2015-10-07,  发布年份 2015

【 摘 要 】

Objective

LIN28B is a conserved RNA-binding protein critically involved in development, cellular metabolism and tumorigenesis. It is frequently overexpressed in human cancers and correlates with tumor aggressiveness as well as unfavorable prognosis. However, the expression pattern and oncogenic roles of LIN28B during oral squamous cell carcinoma (OSCC) development and progression has not been well established yet. Here, we sought to determine the expression of LIN28B and its clinical significance using chemical-induced OSCC animal model, cell lines and primary specimens.

Method

The OSCC animal model was induced using 7,12-dimethyl-1,2-bezan-tracene (DMBA) painting in the hamster buccal pouch. Buccal lesions from animals were obtained from different time points and subjected to routine histological analyses and immunohistochemical staining of LIN28B. The mRNA, protein abundance and subcellular localization of LIN28B was determined in a panel of OSCC cell lines by real-time RT-PCR, western blot and immunofluorescence. The expression levels of LIN28B in human primary OSCC samples were further evaluated by immunohistochemical staining. Moreover, the relationship between LIN28B and several clinicopathological parameters as well as patients’ prognosis were also assessed.

Results

Our results revealed that negative or low LIN28B expression was commonly observed in normal epithelial, whereas more LIN28B abundance was identified in epithelial dysplasia and invasive SCC in the DMBA-induced OSCC animal model. Overexpression of LIN28B was identified in a major fraction of OSCC samples(39/58) and significantly associated with tumor size (P = 0.049) and advanced clinical stages (P = 0.0286). Patients with increased LIN28B had markedly reduced overall survival as compared to those with low LIN28B. Multivariate survival analyses further indicated that LIN28B abundance served as an independent prognostic factor for patients’ overall survival.

Conclusions

Our findings reveal that LIN28B is critically involved in OSCC initiation and progression and aberrantly overexpressed in human OSCC. It might represent a novel diagnostic and prognostic biomarker for oral cancer.

【 授权许可】

   
2015 Wang et al.

【 图 表 】

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