Pharmaceutical Sciences Faculty Publications

Title

Sorafenib Tosylate as a Radiosensitizer in Malignant Astrocytoma

Document Type

Article

Publication Date

1-2014

Journal Title

Journal of Clinical Neuroscience

ISSN

0967-5868

Volume

21

Issue

1

First Page

131

Last Page

136

DOI

http://dx.doi.org/10.1016/j.jocn.2013.04.010

PubMed ID

24139873

Abstract

Progress in research on the molecular aspects of glioblastoma has yet to provide a medical therapy that significantly improves prognosis. Glioblastoma invariably progress through current treatment regimens with radiotherapy as a key component. Activation of several signaling pathways is thought to be associated with this resistance to radiotherapy. Ras activity is exceptionally high in glioblastoma and may regulate sensitivity to radiotherapy. Raf-1, a downstream effector of Ras, demonstrates a high amount of activity inglioblastoma. Therefore, Raf-1 inhibition should be considered as a mechanism to increase the effectiveness of radiotherapy in treatment regimen. In vitro analysis was performed with a novel Raf-1kinase inhibitor (BAY 54-9085) in culture with the glioblastoma cell line U1242. The cell line was treated in serum-containing media and analyzed for the effect of the BAY 54-9085 alone and BAY 54-9085 combined with radiation on cell death. BAY 54-9085 displayed a cytocidal effect on glioblastoma cells following a 3 day incubation with the drug in serum-containing media. A dose of 2.5 μM displayed moderate cell death which significantly increased with a dose of 5.0 μM. In addition, glioblastoma cells treated with both the BAY 54-9085 and gamma radiation displayed a significant increase in cell death (85.5%) as compared to either BAY 54-9085 (73.1%) or radiation (34.4%) alone. Radiation therapy is a key component of treatment for glioblastoma. A novel Raf-1 inhibitor displayed in vitro evidence of synergistically increasing cell death of glioblastoma cells in combination with radiation.

Keywords

Malignant astrocytoma, radiosensitizer, sorafenib