title: Microarray-assisted pathway analysis identifies MT1X & NFκB as mediators of TCRP1-associated resistance to cisplatin in oral squamous cell carcinoma.
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.
authors.affiliation: Affiliated Cancer Hospital and Cancer Research Institute, Guangzhou Medical University, Guangzhou, Guangdong, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Peng
authors.forename: Yixue
authors.initials: Y
authors.lastname: Gu
authors.forename: Yan
authors.initials: Y
authors.lastname: Xiong
authors.forename: Guopei
authors.initials: G
authors.lastname: Zheng
authors.forename: Zhimin
authors.initials: Z
authors.lastname: He
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D017209:Apoptosis / Q000235:genetics; D001483:Base Sequence; D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy / Q000378:metabolism*; D045744:Cell Line, Tumor; D002945:Cisplatin / Q000494:pharmacology* / Q000627:therapeutic use; D017931:DNA Primers; D019008:Drug Resistance, Neoplasm; D055785:Gene Knockdown Techniques; D006801:Humans; D008668:Metallothionein / Q000235:genetics / Q000502:physiology*; D009062:Mouth Neoplasms / Q000188:drug therapy / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism*; D020411:Oligonucleotide Array Sequence Analysis; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction
chemical_list: D000970:Antineoplastic Agents; D017931:DNA Primers; D016328:NF-kappa B; D011506:Proteins; C581554:metallothionein1X, human; C558246:tongue cancer resistance-associated protein 1, human; D008668:Metallothionein; D002945:Cisplatin