American Association for Cancer Research
00085472can180569-sup-197466_2_supp_4856241_p4znv4.docx (16.19 kB)

Supplemental tables 1, 2 and 3 from Replication Stress Drives Constitutive Activation of the DNA Damage Response and Radioresistance in Glioblastoma Stem-like Cells

Download (16.19 kB)
journal contribution
posted on 2023-03-31, 03:46 authored by Ross D. Carruthers, Shafiq U. Ahmed, Shaliny Ramachandran, Karen Strathdee, Kathreena M. Kurian, Ann Hedley, Natividad Gomez-Roman, Gabriela Kalna, Mathew Neilson, Lesley Gilmour, Katrina H. Stevenson, Ester M. Hammond, Anthony J. Chalmers

Supplemental Table 1 Summary table of in vivo growth characteristics of E2, G7, R10, R15, R24, R9 and S2 GSC primary GBM cultures after intracranial injection in CD1 nude mice. Supplemental Table 2 List of primary antibodies utilised Supplemental Table 3 List of secondary antibodies utilised


Cancer Research UK



Glioblastoma (GBM) is a lethal primary brain tumor characterized by treatment resistance and inevitable tumor recurrence, both of which are driven by a subpopulation of GBM cancer stem–like cells (GSC) with tumorigenic and self-renewal properties. Despite having broad implications for understanding GSC phenotype, the determinants of upregulated DNA-damage response (DDR) and subsequent radiation resistance in GSC are unknown and represent a significant barrier to developing effective GBM treatments. In this study, we show that constitutive DDR activation and radiation resistance are driven by high levels of DNA replication stress (RS). CD133+ GSC exhibited reduced DNA replication velocity and a higher frequency of stalled replication forks than CD133− non-GSC in vitro; immunofluorescence studies confirmed these observations in a panel of orthotopic xenografts and human GBM specimens. Exposure of non-GSC to low-level exogenous RS generated radiation resistance in vitro, confirming RS as a novel determinant of radiation resistance in tumor cells. GSC exhibited DNA double-strand breaks, which colocalized with “replication factories” and RNA: DNA hybrids. GSC also demonstrated increased expression of long neural genes (>1 Mbp) containing common fragile sites, supporting the hypothesis that replication/transcription collisions are the likely cause of RS in GSC. Targeting RS by combined inhibition of ATR and PARP (CAiPi) provided GSC-specific cytotoxicity and complete abrogation of GSC radiation resistance in vitro. These data identify RS as a cancer stem cell–specific target with significant clinical potential.Significance: These findings shed new light on cancer stem cell biology and reveal novel therapeutics with the potential to improve clinical outcomes by overcoming inherent radioresistance in GBM. Cancer Res; 78(17); 5060–71. ©2018 AACR.

Usage metrics

    Cancer Research



    Ref. manager