Title:Hypofractionated Radiation Therapy Suppresses Radioresistance in U87 Human Glioma Cells by Inhibiting Yap1 and Hsp90 Proteins
Volume: 17
Issue: 4
Author(s): Imran Khan, Sadaf Mahfooz, Busra Karacam, Elif Burce Elbasan, Kerime Akdur, Ganime Coban and Mustafa Aziz Hatiboglu*
Affiliation:
- Department of Molecular Biology, Beykoz Institute of Life Sciences and Biotechnology, Bezmialem Vakif University,
Yalıköy St., Beykoz, Istanbul, Turkey
- Department of Neurosurgery,
Bezmialem Vakif University Medical School, Vatan Street, Fatih, Istanbul, Turkey
Keywords:
Radioresistance, hypofractionated radiation, stereotactic radiation therapy, glioblastoma, gamma knife, apoptosis.
Abstract:
Background: Radiotherapy plays a vital role in the management of high-grade gliomas.
However, the radio resistance of glioma cells limits the effect of radiation and drives recurrence
inside the irradiated tumor volume leading to poor outcomes for patients.
Methods: High-grade glioma cell radioresistance significantly contributes to radiotherapy failure,
highlighting the importance of identifying predictive biomarkers for radioresistance. An
increasing body of evidence complies with the Yes Associated Protein 1 (Yap-1) and heat shock
protein 90 (Hsp90) as biomarkers for radioresistance in glioma cells. A number of studies suggest
the potential of radioresistance-associated factors as biomarkers and/ or novel therapeutic
targets in glioma cells. Thus, it is essential for glioblastoma patients to identify robust druggable
targets involved in radioresistance, optimizing irradiation protocol, and understanding their underlying
molecular mechanisms.
Results: Therefore, in the present study, we hypothesized that hypofractionated Gamma Knife
radiation therapy (HF-GKRT) could target Yap-1 and Hsp90 and downregulate the mechanism
of radioresistance in high-grade glioma cells.
Conclusion: For this purpose, expression levels of radioresistance markers Yap-1 and Hsp90
were evaluated after treatment with HF-GKRT, and this was compared with single fraction
Gamma Knife radiation therapy (SF-GKRT) in U87MG primary human glioblastoma cell line
model. This would help design a novel radiation therapy regimen for glioblastoma patients by
reducing the risk of radioresistance.