Promoter methylation of Wnt/β-Catenin signal inhibitor TMEM88 is associated with unfavorable prognosis of nonsmall cell lung cancer

Rongna Ma, Nannan Feng, Xiao Yu, Hongyan Lin, Xiaohong Zhang, Oumin Shi, Huan Zhang, Shuo Zhang, Lei Li, Min Zheng, Ming Gao, Herbert Yu, Biyun Qian

Abstract


Objective: Recent research has indicated that altered promoter methylation of oncogenes and tumor suppressor genes is animportant mechanism in lung cancer development and progression. In this study, we investigated the association between promoter methylation of TMEM88, a possible inhibitor of the Wnt/β-Catenin signaling, and the survival of patients with non-small cell lung cancer (NSCLC).

Methods: Twelve pairs of tumor and adjacent non-tumor samples were used for microarray analyses of DNA methylation andgene expression. For validation, more than two hundred additional samples were analyzed for methylation using bisulfitepyrosequencing and for gene expression using qRT-PCR. Then the cell function were tested by wound healing, transwell, CCK8and cell cycle assay.

Results: Our analysis of patient specimens showed that TMEM88 methylation was higher in NSCLC tumors (82.2% ± 10.3, P <0.01) compared with the adjacent normal tissues (65.9% ± 7.2). The survival analysis revealed that patients with high TMEM88methylation had a shorter overall survival (46 months) compared with patients with low TMEM88 methylation (>56 months;P=0.021). In addition, we found that demethylation treatment could inhibit tumor cell proliferation, migration, and invasion,which was supportive of an association between methylation and survival.

Conclusions: Based on these consistent observations, we concluded that TMEM88 may play an important role in NSCLC progression and that promoter methylation of TMEM88 may serve as a biomarker for NSCLC prognosis and treatment.


Keywords


TMEM88; lung cancer; methylation; prognosis; Wnt/β-Catenin signaling

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