Increased expression of antioxidant enzymes in radioresistant variant from U251 human glioblastoma cell line.

Abstract:

:Glioblastoma is one of the most radioresistant tumors. Exposure of cells to ionizing radiation leads to formation of reactive oxygen species (ROS) that are associated with radiation-induced cytotoxicity. ROS scavengers, therefore, are one of the important factors in protecting cells against ROS injury during ionizing radiation exposure. In the present study, we isolated and established a radioresistant variant clone (RRC) from U251 human glioblastoma cell line and investigated the potential role of antioxidant enzymes in radioresistance of the glioblastoma cell line. RRC showed a higher radioresistance than the parent cell line as measured by clonogenic survival assay and showed delayed G2/M arrest. Antioxidant enzymes, such as superoxide dismutase (SOD), catalase, glutathione peroxidase (GPX), glutathione reductase (GR), were activated up to 5-fold in RRC compared to the parent cells after radiation. In addition, RRC also had cross-resistance to the antitumor agent cisplatin. Therefore, radioresistance and cross-resistance to chemotherapeutic agent in RRC might be due to the highly coordinated activation of antioxidant enzymes rather than a single enzyme alone.

journal_name

Int J Mol Med

authors

Lee HC,Kim DW,Jung KY,Park IC,Park MJ,Kim MS,Woo SH,Rhee CH,Yoo H,Lee SH,Hong SI

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

883-7

issue

6

eissn

1107-3756

issn

1791-244X

journal_volume

13

pub_type

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