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Electro-hyperthermia inhibits glioma tumorigenicity through the induction of E2F1-mediated apoptosis

Title
 Electro-hyperthermia inhibits glioma tumorigenicity through the induction of E2F1-mediated apoptosis 
Authors
 Jihye Cha ; Tae-Won Jeon ; Yun-Han Lee ; Young Nyun Park ; Kyung Ran Park ; In Hye Baik ; Ina Yun ; Daekwan Seo ; Kyung-Ju Choi ; Hee-Beom Yang ; Sang Taek Oh ; Chang Geol Lee 
Issue Date
2015
Journal Title
 International Journal of Hyperthermia 
ISSN
 0265-6736 
Citation
 International Journal of Hyperthermia , Vol.31(7) : 784~792, 2015 
Abstract
PURPOSE: Modulated electro-hyperthermia (mEHT), also known as oncothermia, shows remarkable treatment efficacies for various types of tumours, including glioma. The aim of the present study was to investigate the molecular mechanism underlying phenotypic changes in oncothermic cancer cells. MATERIALS AND METHODS: U87-MG and A172 human glioma cells were exposed to mEHT (42 °C/60 min) three times with a 2-day interval and subsequently tested for growth inhibition using MTS, FACS and microscopic analysis. To obtain insights into the molecular changes in response to mEHT, global changes in gene expression were examined using RNA sequencing. For in vivo evaluation of mEHT, we used U87-MG glioma xenografts grown in nude mice. RESULTS: mEHT inhibited glioma cell growth through the strong induction of apoptosis. The transcriptomic analysis of differential gene expression under mEHT showed that the anti-proliferative effects were induced through a subset of molecular alterations, including the up-regulation of E2F1 and CPSF2 and the down-regulation of ADAR and PSAT1. Subsequent Western blotting revealed that mEHT increased the levels of E2F1 and p53 and decreased the level of PARP-1, accelerating apoptotic signalling in glioma cells. mEHT significantly suppressed the growth of human glioma xenografts in nude mice. We also observed that mEHT dramatically reduced the portion of CD133(+) glioma stem cell population and suppressed cancer cell migration and sphere formation. CONCLUSIONS: These findings suggest that mEHT suppresses glioma cell proliferation and mobility through the induction of E2F1-mediated apoptosis and might be an effective treatment for eradicating brain tumours.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/141576
DOI
10.3109/02656736.2015.1069411
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Yonsei Biomedical Research Center
1. 연구논문 > 1. College of Medicine > Dept. of Pathology
1. 연구논문 > 1. College of Medicine > Dept. of Radiation Oncology
Yonsei Authors
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Link
 http://www.tandfonline.com/doi/full/10.3109/02656736.2015.1069411
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