J Cancer 2020; 11(22):6675-6685. doi:10.7150/jca.46146 This issue

Research Paper

Deubiquitinase UCHL5 is elevated and associated with a poor clinical outcome in lung adenocarcinoma (LUAD)

Jieru Zhang1, Hui Xu2, Xiaomei Yang3, Yuanjie Zhao4, Xinchun Xu5, Ling Zhang6, Xiaofeng Xuan1, Chunping Ma2, Wenxia Qian1✉, Dawei Li6✉

1. Department of Respiratory & Critical Care Medicine, The Affiliated Zhangjiagang Hospital of Soochow University, 68 Jiyang West Road, Suzhou, 215600, China.
2. Department of Thoracic Surgery, The Affiliated Zhangjiagang Hospital of Soochow University, 68 Jiyang West Road, Suzhou, 215600, China.
3. Department of Emergency, The Affiliated Zhangjiagang Hospital of Soochow University, 68 Jiyang West Road, Suzhou, 215600, China.
4. Department of General Surgery, The Affiliated Zhangjiagang Hospital of Soochow University, 68 Jiyang West Road, Suzhou, 215600, China.
5. Department of Ultrasound, The Affiliated Zhangjiagang Hospital of Soochow University, 68 Jiyang West Road, Suzhou, 215600, China.
6. Center for Translational Medicine, The Affiliated Zhangjiagang Hospital of Soochow University, 68 Jiyang West Road, Suzhou, 215600, China.

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Citation:
Zhang J, Xu H, Yang X, Zhao Y, Xu X, Zhang L, Xuan X, Ma C, Qian W, Li D. Deubiquitinase UCHL5 is elevated and associated with a poor clinical outcome in lung adenocarcinoma (LUAD). J Cancer 2020; 11(22):6675-6685. doi:10.7150/jca.46146. Available from https://www.jcancer.org/v11p6675.htm

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Abstract

Lung cancer is one of the most common malignant tumors in the world, with a high rate of malignancy and mortality. Seeking new biomarkers and potential drug targets is urgent for effective treatment of the disease. Deubiquitinase UCHL5/UCH37, as an important component of the 26S proteasome, plays critical roles in ubiquitinated substrate degradation. Although previous studies have shown that UCHL5 promotes tumorigenesis, its role in lung cancer remains largely unknown. In this study, we evaluated the expression and clinical significance of UCHL5 in non-small cell lung cancer (NSCLC). The results demonstrated that the UCHL5 expression level was significantly upregulated in NSCLC tissues compared with the adjacent noncancerous tissues. The level of UCHL5 was associated with tumor size, lymph node invasion, TNM stage and malignant tumor history in patients with lung adenocarcinoma (LUAD). Importantly, high UCHL5 expression predicted a poor overall survival (OS) and a poor disease-free survival (DFS) in patients with LUAD. Univariate regression analysis showed that tumor size, lymph node invasion, TNM stage and UCHL5 expression were associated with OS and DFS in patients with LUAD. The multivariate analysis indicated that the UCHL5 expression level was an independent prognostic factor for OS (HR=1.171, 95% CI=1.052-1.303) and DFS (HR=1.143, 95% CI=1.031-1.267) in these patients. UCHL5 knockdown in LUAD cells significantly inhibited cell proliferation and reduced the expression of key cell cycle proteins. These findings indicate that UCHL5 may serve as a potential prognostic marker and a new therapeutic target for patients with LUAD.

Keywords: Deubiquitinase, UCHL5/UCH37, Lung adenocarcinoma, Prognosis, Cell cycle proteins