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• W2031951501 abstract "Proceedings: AACR Annual Meeting 2014; April 5-9, 2014; San Diego, CANasopharyngeal carcinoma (NPC) is an Epstein-Barr virus associated cancer of the nasopharynx. Annual incidence in China is high, reaching up to 25 per 100,000. NPC is a highly invasive and metastatic disease. At diagnosis, over 60% of patients have advanced disease where treatment failure due to distant recurrence or metastasis is common. More effective forms of therapy to treat this deadly disease are therefore urgently needed.The TP53 induced glycolysis and apoptosis regulator (TIGAR) is a p53 target gene which blocks glycolysis and promotes cellular metabolism via the pentose phosphate pathway. TIGAR promotes production of cellular nicotinamide adenine dinucleotide phosphate (NADPH), leading to enhanced scavenging of intracellular reactive oxygen species (ROS) and inhibition of oxidative-stress induced apoptosis in normal cells. Previously, we have found that a novel nucleoside analog inhibited cell growth and induced apoptosis in NPC cell lines via down-regulation of TIGAR expression. Moreover, the growth inhibitory effect of c-Met tyrosine kinase inhibitors was ameliorated by over-expression of TIGAR in NPC cell lines. These results are indicative of a pivotal role for TIGAR expression in maintaining NPC cell survival.In this study, we investigated the expression pattern of TIGAR in NPC tumor tissues and the consequences of TIGAR overexpression and knockdown on NPC cell growth and invasion. It was found that TIGAR is overexpressed in 27 out of 36 (75%) NPC cases in the tumor cells compared to their respective normal epithelial cells. Overexpression of TIGAR in NPC cell lines resulted in increased proliferation, invasion, NADPH production and up-regulation of mesenchymal markers including fibronectin and vimentin. These changes were reversed when TIGAR expression was knocked down by transfection with siRNA, demonstrating specificity of the observed effects. Together, our results indicate that TIGAR expression promotes proliferation, invasiveness and expression of mesenchymal markers in NPC cells. These findings may form the basis for development of a new therapeutic target for treatment of NPC in the future.Citation Format: Elaine YL Wong, SC Cesar Wong, Charles ML Chan, Emily KY Lam, Louisa Ho, Cecilia PY Lau, Thomas CC Au, Amanda KC Chan, CM Tsang, George SW Tsao, Vivian WY Lui, Anthony TC Chan. Functional significance of TIGAR expression in nasopharyngeal carcinoma. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 5003. doi:10.1158/1538-7445.AM2014-5003" @default.
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• W2031951501 date "2014-09-30" @default.
• W2031951501 modified "2023-10-02" @default.
• W2031951501 title "Abstract 5003: Functional significance of TIGAR expression in nasopharyngeal carcinoma" @default.
• W2031951501 doi "https://doi.org/10.1158/1538-7445.am2014-5003" @default.
• W2031951501 hasPublicationYear "2014" @default.
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