Decreased expression of 14‐3‐3 σ, an early event of malignant transformation of respiratory epithelium, also facilitates progression of squamous cell lung cancer

Thoracic Cancer

Nan Sun²  Yongkai Wu²  Bo Huang¹  Qian Liu¹  Yinan Dong²  Jianqiao Ding² 

[1] Department of Pathology, Liaoning Cancer Hospital and Institute, Shenyang, China;Department of Thoracic Surgery, Liaoning Cancer Hospital and Institute, Shenyang, China

关键词: 14‐3‐3 σ;    lung squamous cell carcinoma;    precancerous lesion;    prognosis;   

DOI  :  10.1111/1759-7714.12246

来源: Wiley

【 摘 要 】

Abstract

Background

It has been shown that 14-3-3 σ serves as a tumor suppressor gene, and is downregulated in various tumor tissues. However, the role of 14-3-3 σ during the initiation and progression of lung squamous cell carcinoma (SqCC) is not well understood.

Methods

The expression status of 14-3-3 σ in archival tissue samples from 40 lung SqCC patients (36 with normal bronchia, 19 squamous metaplasia, and 17 dysplasia/carcinoma in situ, in their tissue samples) was examined by immunohistochemical analysis. The proliferation rate and tumor formation ability of the H520 cell transfected with 14-3-3 σ was tested with methyl thiazolyl tetrazolium assay and nude mice subcutaneous injection, respectively.

Results

In the normal bronchial epithelia, 14-3-3 σ was highly expressed, whereas it was significantly decreased in precancerous and cancerous tissues. Compared with matched invasive cancer tissues, the expression level of 14-3-3 σ in squamous metaplasia was significantly higher (P = 0.049), while that in dysplasia/carcinoma in situ showed no significant changes (P = 0.135). Statistical analysis showed that the expression level of 14-3-3 σ in tumor tissue was associated with the differentiation grade of the tumor (P = 0.001) and the prognosis of the patient (P = 0.003). The overexpression of 14-3-3 σ significantly suppressed the proliferation of H520 cells in vitro and in vivo.

Conclusion

The inactivation of 14-3-3 σ may be a very early event in tumorigenesis and could facilitate the initiation and progression of lung SqCC in a sustainable way.

【 授权许可】

CC BY-NC   
© 2015 The Authors. Thoracic Cancer published by China Lung Oncology Group and Wiley Publishing Asia Pty Ltd.

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