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15 January 2019 : Laboratory Research

Radix Tetrastigma Hemsleyani Flavone Suppresses Cutaneous Squamous Cell Carcinoma A431 Cells via Proteasome Inhibition

Liangrui Zhong1AE, Xiaohong Yang1F, Yiping Zhu2B, Jianzhong Peng2CG, Yi Cao1A*

DOI: 10.12659/MSM.913889

Med Sci Monit 2019; 25:436-442

Abstract

BACKGROUND: Radix Tetrastigma Hemsleyani Flavone (RTHF) has detoxification and anti- inflammation activity and is widely used. Here, we report that RTHF inhibits cell proliferation and induces apoptosis in cutaneous squamous cell carcinoma A431 cells and is a potential strategy for cancer therapy.

MATERIAL AND METHODS: A431 cells were cultured in different concentrations of RTHF. The inhibition of cell proliferation was assessed by MTT assay, cell apoptosis was shown through FCM, and cell invasion was assessed by Transwell methods. Enzyme proteasome assay was used to detect the activity of proteasome and DUB. Expression of apoptosis-related and ubiquitin proteasome pathway-associated proteins were assessed by PCR and Western blot.

RESULTS: RTHF obviously suppressed the proliferation and induced apoptosis of A431 cells in a dose-dependent manner. Transwell assay showed that RTHF inhibited the cell metastasis significantly. Enzyme proteasome assay show that the RTHF treatment of activity of proteasome and DUB was significantly lower than in control. RTHF increased the expression of Bax and inhibited Bcl-2, pro-caspase3, and pro-caspase9 activity. The expression of USP14, UCHL5, and POH1 decreased and ub-prs increased significantly in the treatment group.

CONCLUSIONS: Our study reveals that RTHF-mediated inhibition of DUBs and proteasome may provide a potential strategy for cancer therapy.

Keywords: Carcinoma, Squamous Cell, Proteasome Inhibitors

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750