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Current Cancer Drug Targets
ISSN (Print): 1568-0096
ISSN (Online): 1873-5576
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Effect of Altered WIG-1 Expression on DDP Sensitivity in a DDPResistant Esophageal Squamous Cancer Cell Line

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Author(s): Yang Qiu, Ying-Bo Zou, Kun Li, Yao-Guang Jiang, Kang Yang, Yun-Ping Zhao and Wei Guo
Pages 1-12 (12)
Abstract:
Esophageal cancer (EC) is the most common esophageal malignancy and has a dismal prognosis. Developing novel strategies to reverse the resistance to chemotherapeutics in EC is currently of intense interest. The wide-type p53 induced gene 1 (WIG-1) is a p53-regulated transcription factor. The effect of WIG-1 on the regulation of cisplatin (DDP) sensitivity was evaluated in DDP-resistant EC cells both in vitro and in vivo. The DDP-resistant sub-line EC109/DDP was successfully selected following eight months of culture. Overexpression of WIG-1 in EC109/DDP cells significantly lowered the IC50 of DDP to 1.11 ± 0.54 μg/ml when compared to Control cells (4.57 ± 0.98 μg/ml, P < 0.05). In addition, WIG-1 exerted a negative effect on cell proliferation and on the cloning efficiency of EC109/DDP cells. A significant increase in the apoptosis index and in TUNEL-positive nuclei was observed when the expression of WIG-1 was upregulated. Furthermore, WIG-1-overexpressing DDP-resistant EC cells exhibited suppressed xenograft tumor growth and a lower green fluorescent protein (GFP) fluorescence intensity following DDP injection. WIG-1 also reduced the expression of ERCC1 and increased the expression of Bax in DDP-resistant EC cells, while the expression of Bcl-2, P-gp and GST-π was not significantly altered after up- or down-regulation of WIG-1. In summary, these results show that WIG-1 may reverse the DDP resistance of EC cells by reducing ERCC1 expression and increasing Bax expression. This study will provide a framework for understanding the mechanism of DDP resistance by WIG-1 and will aid in the therapeutic use of DDP in ESCC.
Keywords:
WIG-1, ESCC, EC109, DDP, drug resistance, chemotherapy
Affiliation:
Department of Thoracic Surgery, Institute of Surgery Research, Daping Hospital, Third Military Medical University, 10 Changjiang Road, Chongqing 400042, China