Microarray-Assisted Pathway Analysis Identifies MT1X & NFκB as Mediators of TCRP1-Associated Resistance to Cisplatin in Oral Squamous Cell Carcinoma |
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| Authors: | Bo Peng Yixue Gu Yan Xiong Guopei Zheng Zhimin He |
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| Affiliation: | 1. Affiliated Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, Guangdong, China.; 2. Department of Pharmacology, Guangzhou Medical University, Guangzhou, Guangdong, China.; 3. Cancer Research Institute, College of Medicine, University of South China, Hengyang, Hunan, China.; 4. Cancer Research Institute, Xiangya School of Medicine, Central South University, Changsha, Hunan, China.; Virginia Commonwealth University, United States of America, |
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| Abstract: | We recently reported that TCRP1, a novel multidrug-resistance associated human gene, can mediate cisplatin resistance in OSCC cells. However, the molecular mechanism underlying this role of TCRP1 remained to be elucidated. In this study, by using Human Toxicology and Drug Resistance Microarray, we identified 30 genes with significantly different expression levels between Tca/PYM and TCRP1 knockdown cell lines. Co-immunoprecipitation experiments and GST-pull down assays showed that metallothionein1X (MT1X) and Akt interact with TCRP1. siRNA-mediated knockdown of TCRP1 and MT1X was found to sensitize cells to cisplatin, leading to increased apoptosis and inhibition of cell proliferation. These functions of TCRP1 may be caused at least in part via activation of the PI3K/Akt/NF-κB signaling pathway. Taken together, our findings indicate that TCRP1 may be an important drug target for improvement of the treatment and survival of patients with oral squamous cell carcinoma. |
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