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Basal HIF-1α expression levels are not predictive for radiosensitivity of human cancer cell lines.
Strahlenther. Onkol. 188, 353-358 (2012)
BACKGROUND AND PURPOSE: High levels of hypoxia inducible factor (HIF)-1α in tumors are reported to be associated with tumor progression and resistance to therapy. To examine the impact of HIF-1α on radioresistance under normoxia, the sensitivity towards irradiation was measured in human tumor cell lines that differ significantly in their basal HIF-1α levels. MATERIAL AND METHODS:HIF-1α levels were quantified in lysates of H1339, EPLC-272H, A549, SAS, XF354, FaDu, BHY, and CX- tumor cell lines by ELISA. Protein levels of HIF-1α, HIF-2α, carbonic anhydrase IX (CA IX), and GAPDH were assessed by Western blot analysis. Knock-down experiments were performed using HIF-1α siRNA. Clonogenic survival after irradiation was determined by the colony forming assay. RESULTS: According to their basal HIF-1α status, the tumor cell lines were divided into low (SAS, XF354, FaDu, A549, CX-), intermediate (EPLC-272H, BHY), and high (H1339) HIF-1α expressors. The functionality of the high basal HIF-1α expression in H1339 cells was proven by reduced CA IX expression after knocking-down HIF-1α. Linear regression analysis revealed no correlation between basal HIF-1α levels and the survival fraction at either 2 or 4 Gy in all tumor cell lines investigated. CONCLUSION: Our data suggest that basal HIF-1α levels in human tumor cell lines do not predict their radiosensitivity under normoxia.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Basal HIF-1α expression ; Normoxia; Radiosensitivity; Carbonic anhydrase IX
ISSN (print) / ISBN 0179-7158
Quellenangaben Volume: 188, Issue: 4, Pages: 353-358
Publisher Urban & Vogel
Reviewing status Peer reviewed
Institute(s) CCG Innate Immunity in Tumor Biology (IBMI-KTB)