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©2010 Baishideng. All rights reserved.
Effects of thymidine phosphorylase on tumor aggressiveness and 5-fluorouracil sensitivity in cholangiocarcinoma
Jongkonnee Thanasai, Temduang Limpaiboon, Patcharee Jearanaikoon, Banchob Sripa, Chawalit Pairojkul, Srisurang Tantimavanich, Masanao Miwa
Jongkonnee Thanasai, Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand; Department of Clinical Chemistry, Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand
Temduang Limpaiboon, Patcharee Jearanaikoon, Department of Clinical Chemistry, Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand
Banchob Sripa, Chawalit Pairojkul, Department of Pathology, Liver Fluke and Cholangiocarcinoma Research Center, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand
Srisurang Tantimavanich, Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand
Masanao Miwa, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
Author contributions: Thanasai J and Limpaiboon T contributed equally to this work; Thanasai J, Limpaiboon T, Jearanaikoon P and Miwa M designed the research, analyzed data and wrote the paper; Thanasai J performed the research; Sripa B, Pairojkul C and Tantimavanich S contributed cell lines, analyzed and interpreted data; Limpaiboon T and Miwa M revised and approved the article.
Supported by The Thailand Research Fund through The Royal Golden Jubilee PhD Program Grant No. PHD/0037/2544 for Thanasai J and Limpaiboon T and grants-in-aid from the Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Thailand, and from the Ministry of Education, Sports, Science, Culture and Technology, Japan
Correspondence to: Dr. Temduang Limpaiboon, Department of Clinical Chemistry, Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand. temduang@kku.ac.th
Telephone: +66-43-362028 Fax: +66-43-202088
Received: October 26, 2009
Revised: November 30, 2009
Accepted: December 6, 2009
Published online: April 7, 2010
AIM: To evaluate the role of thymidine phosphorylase (TP) in cholangiocarcinoma using small interfering RNA (siRNA).
METHODS: A human cholangiocarcinoma-derived cell line KKU-M139, which has a naturally high level of endogenous TP, had TP expression transiently knocked down using siRNA. Cell growth, migration, in vitro angiogenesis, apoptosis, and cytotoxicity were assayed in TP knockdown and wild-type cell lines.
RESULTS: TP mRNA and protein expression were decreased by 87.1% ± 0.49% and 72.5% ± 3.2%, respectively, compared with control cells. Inhibition of TP significantly decreased migration of KKU-M139, and suppressed migration and tube formation of human umbilical vein endothelial cells. siRNA also reduced the ability of TP to resist hypoxia-induced apoptosis, while suppression of TP reduced the sensitivity of KKU-M139 to 5-fluorouracil.
CONCLUSION: Inhibition of TP may be beneficial in decreasing angiogenesis-dependent growth and migration of cholangiocarcinoma but may diminish the response to 5-fluorouracil chemotherapy.
