SENP2 exerts an anti‑tumor effect on chronic lymphocytic leukemia cells through the inhibition of the Notch and NF‑κB signaling pathways

Chen,Xiu‑Li; Wang,Shi‑Fen; Liang,Xue‑Ting; Liang,Hui‑Xin; Wang,Ting‑Ting; Wu,Shun‑Quan; Qiu,Zong‑Jian; Zhan,Rong; Xu,Zhen‑Shu

doi:10.3892/ijo.2018.4635

SENP2 exerts an anti‑tumor effect on chronic lymphocytic leukemia cells through the inhibition of the Notch and NF‑κB signaling pathways

Authors:
- Xiu‑Li Chen
- Shi‑Fen Wang
- Xue‑Ting Liang
- Hui‑Xin Liang
- Ting‑Ting Wang
- Shun‑Quan Wu
- Zong‑Jian Qiu
- Rong Zhan
- Zhen‑Shu Xu
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Affiliations: Fujian Institute of Hematology, Fujian Provincial Key Laboratory on Hematology, Fujian Medical University Union Hospital, Fuzhou, Fujian 350001, P.R. China
Published online on: November 14, 2018 https://doi.org/10.3892/ijo.2018.4635
Pages: 455-466
Copyright: © Chen et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Chronic lymphocytic leukemia (CLL) is one of the most often diagnosed hematological malignant tumors in the Western world and a type of inert B‑cell lymphoma that commonly attacks the elderly. Small ubiquitin related modifier (SUMO)‑specific protease 2 (SENP2) can act as a suppressor in various types of cancer by regulating the stability of β‑catenin to affect the Notch signaling pathway; however, it has a low expression level in CLL cells. In this study, we firstly used western blot analysis and RT‑qPCR to detect the protein and mRNA expression levels of SENP2 in the peripheral blood of patients with CLL and healthy volunteers. Secondly, we overexpressed or knocked down the expression of SENP2 in CLL cells and then determined the cell invasive and chemotactic ability in a Transwell assay and chemotaxis assay. We examined the sensitivity of the cells to cytarabine and dexamethasone via a CCK‑8 assay and determined the cell apoptotic condition and the expression of the Notch signaling pathway using flow cytometry and western blot analysis. The results demonstrated that the patients with CLL had relatively low expression levels of SENP2. The overexpression of SENP2 in the CLL cells decreased their invasive and proliferative ability, as well as their chemotactic response and enhanced their sensitivity to cytarabine and dexamethasone, while it promoted cell apoptosis. The silencing of SENP2 in the CLL cells generally produced the opposite results. We thus hypothesized that the overexpression of SENP2 downregulated β‑catenin expression, thus inhibiting the Notch signaling pathway in CLL cells. Moreover, the nuclear factor (NF)‑κB signaling pathway was also regulated by the overexpression of SENP2. On the whole, the findings of this study indicate tha SENP2 can act as a tumor suppressor in CLL cells, and may thus prove to be a novel target for CLL treatment in clinical practice.

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