Notch3 is involved in the proliferation of renal cancer cells via regulation of cell cycle progression and HIF‑2&alpha;

Han,Qipeng; Han,Fangzhu; Fan,Yisheng; Lian,Bowen; Xiao,Jinyang; Sun,Wei; Han,Dongbing; Kou,Hongbo; Li,Chunyan; Wu,Bin

doi:10.3892/ol.2020.12242

Notch3 is involved in the proliferation of renal cancer cells via regulation of cell cycle progression and HIF‑2α

Authors:
- Qipeng Han
- Fangzhu Han
- Yisheng Fan
- Bowen Lian
- Jinyang Xiao
- Wei Sun
- Dongbing Han
- Hongbo Kou
- Chunyan Li
- Bin Wu
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Affiliations: Department of Urinary Surgery, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China, Center of Science Experiments, China Medical University, Shenyang, Liaoning 110122, P.R. China, Department of Urinary Surgery, General Hospital of Northern Theater Command, Shenyang, Liaoning 110001, P.R. China
Published online on: October 22, 2020 https://doi.org/10.3892/ol.2020.12242
Article Number: 379

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Abstract

Renal cell carcinoma (RCC) is one of the most common malignant tumors of the urinary system. Although deregulation of the Notch signaling pathway is common in RCC and is involved in the tumorigenic process, the exact role of Notch3 and its underlying molecular mechanism in RCC, particularly in hypoxia, remain unknown. In the present study, RO4929097, a Notch3 inhibitor, was used to alter NICD3 expression. A Cell Counting Kit‑8 assay, EdU incorporation assay, colony formation assay, flow cytometry and western blot analysis were used to investigate the effects of altered NICD3 expression on cell proliferation, cell cycle progression and HIF‑2α protein expression. The results of western blot analysis showed that RO4929097 dose‑dependently decreased the expression of Notch3 intracellular domain (NICD3) in 786‑O and ACHN cells, which originate from clear cell RCC (ccRCC). The results of the Cell Counting Kit‑8, EdU incorporation and colony formation assays demonstrated that downregulation of NICD3 significantly suppressed cell proliferation in both normoxia and hypoxia. In addition, flow cytometry and western blot analysis demonstrated that hypoxia (2% O₂) promoted cell cycle progression in ccRCC cells with the increased expression of G₁‑S transition‑associated proteins, namely cyclin‑dependent kinase (CDK)4 and cyclin D1, while downregulation of NICD3 exerted negative effects on cell cycle progression, and the expression levels of CDK4 and cyclin D1. Furthermore, western blot analysis revealed that 2% O₂‑induced upregulated hypoxia‑inducible factor‑2α (HIF‑2α) expression decreased following downregulation of NICD3 in 786‑O and ACHN cells. Following transfection of the vector containing the NICD3 coding sequence, HIF‑2α, CDK4, cyclin D1 and proliferating cell nuclear antigen expression,that were inhibited by RO4929097 in hypoxia, were rescued. Collectively, the results of the present study suggest that Notch3 is closely associated with the cell proliferation of ccRCC cells by regulating the cell cycle and HIF‑2α.

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